Carrier Fcm4 Installation and user guide

Service and Maintenance Instructions

Table of Contents

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

FAN COIL DESCRIPTION and TROUBLESHOOTING . . . . . . . . 2

PSC FAN MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

ELECTRIC HEATER SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . 2

CLEANING OR REPLACING REFRIGERANT

FLOW-CONTROL DEVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SEQUENCE OF OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Control Board (contact FAST for part number). . . . . . . . . . . . . . . 2

FEM4P, FEM4X, FEV, FJM, FXM4, REM4P, REM4X, WAHA,

WAPM, WAPT, WAPL, WAHM, WAHT, WAHL, WAXM, WAXT,

WAXL, WBHL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

MULTI-SPEED ECM FAN MOTOR . . . . . . . . . . . . . . . . . . . . . . 4

FVM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

FMA4P, WAMA, FMA4X, WAXA . . . . . . . . . . . . . . . . . . . . . . 15

FAN MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

ELECTRIC HEATER SERVICE . . . . . . . . . . . . . . . . . . . . . . . . 16

SEQUENCE OF OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . 16

CLEANING OR REPLACING REFRIGERANT

FLOW-CONTROL DEVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

SEQUENCE OF OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . 17

ELECTRIC HEATER FUNCTION AND

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

FCM4, FEM4, FEV, FJM, FSA4, FXM4, FVM4, REM4, WAPM,

WAPT, WAPL, WAHM, WAHT, WAHL, WAXM, WAXT, WAXL,

WBHL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

FMA4, WAMA, WAXA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

FCM4, FEM4, FEV, FJM, FXM4, FVM4, WAP, WAH, WAX,

WBHL, REM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

FSA4, FMA4, WAMA, WAXA . . . . . . . . . . . . . . . . . . . . . . . . . 23

Refrigerant Flow-Control Devices. . . . . . . . . . . . . . . . . . . . . . . . 24

Aluminum Coil Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Coil & Condensate Pan Removal and Replacement . . . . . . . . . . 26

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or

use can cause explosion, fire, electrical shock, or other conditions which

may cause death, personal injury or property damage. Consult a

qualified installer, service agency, or your distributor or branch for

information or assistance. The qualified installer or agency must use

factory-authorized kits or accessories when modifying this product.

Refer to the individual instructions packaged with kits or accessories

when installing.

Follow all safety codes. Wear safety glasses, protective clothing and

work gloves. Have a fire extinguisher available. Read these instructions

thoroughly and follow all warnings or cautions included in literature and

attached to the unit. Consult local building codes and the current editions

of the National Electrical Code (NEC) NFPA 70.

In Canada, refer to the current editions of the Canadian Electrical Code

CSA C22.1.

Recognize safety information. This is the safety-alert symbol . When

you see this symbol on the unit and in instruction manuals, be alert to the

potential for personal injury.

Understand the signal words DANGER, WARNING, and CAUTION.

These words are used with the safety-alert symbol. DANGER identifies

the most serious hazards which will result in severe personal injury or

death. WARNING signifies hazards which could result in personal

injury or death. CAUTION is used to identify unsafe practices which

may result in minor personal injury or product and property damage.

NOTE is used to highlight suggestions which will result in enhanced

installation, reliability, or operation.

INTRODUCTION

These fan coil units are designed for flexibility in a variety of

applications that meet upflow, horizontal, or downflow requirements.

Units are available in 1-1/2 through 5 ton nominal cooling capacities.

Factory-authorized, field-installed electric heater packages are available

in 5kW @ 240VAC through 30kW @ 240VAC single phase selections

and 3-phase selections.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4,

FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL

Vertical/Horizontal/Multi-Position Fan Coil Units

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in equipment damage,

improper operation or personal injury.

When coils are pressurized with nitrogen, open the suction port first to

release the nitrogen. Mesh screens may dislodge if the liquid line is

opened first.

WARNING

UNIT OPERATION AND SAFERTY HAZARD

Failure to follow this warning could result in personal injury or death.

R-410A systems operate at higher pressures than R-22 systems. Do not

use R-22 service equipment or components on R-410 equipment.

Ensure service equipment is rated for R-410A.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing or servicing unit, always turn off all power to unit.

There may be more than one disconnect switch. Turn off accessory

heater power if applicable. Lock out and tag switch with a suitable

warning label.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

FAN COIL DESCRIPTION and

TROUBLESHOOTING

PSC FAN MOTOR

FSM4, FSU4, FSA4

The PSC motor is two or three speed direct drive. High-speed lead is

black, low-speed lead is red, and common lead is yellow. Be sure proper

blower speed has been selected..

The motor is turned on through two different routes. The first occurs

when thermostat calls for the fan in cooling, heat pump, or fan-only

mode. A 24VAC signal is sent to relay, causing relay to close its

normally open contacts, turning fan on.

The second occurs when there is a call for electric heat. A 24VAC signal

is sent to heater sequencer/relay, causing it to close, directing 230V

through the normally closed contact of fan relay, turning fan on. The fan

remains on until sequencer/relay opens.

If motor does not run, test motor for an open winding or a winding

shorted to motor case. If either is present, replace motor.

ELECTRIC HEATER SERVICE

Service can be completed with heater in place. Shut off power before

servicing.

LIMIT SWITCH

Refer to Electric heater function and troubleshooting on pg 15.

SEQUENCER

Refer to Electric heater function and troubleshooting on pg 15.

TRANSFORMER

A 40VA transformer supplies 24V power for control circuit. Check for

208/230V on primary side of transformer. If present, check for 24V on

secondary side.

NOTE: Transformer is fused. Do not short circuit.

FAN RELAY

Relay coil is 24V. Check for proper control voltage. Replace relay if

faulty.

CLEANING OR REPLACING REFRIGERANT

FLOW-CONTROL DEVICE

Refer to Fig. 22 and instructions in Piston Body Cleaning and

Replacement on pg 25.

The refrigerant flow-control device is protected by a wire mesh strainer.

It is located inside the 3/8-in. liquid tube at field braze joint next to

flow-control device. Access to strainer is through field braze joint.

SEQUENCE OF OPERATION

Condensing Unit

COOLING

When thermostat calls for cooling, the circuit between R and G is

complete and single-pole single-throw relay FR is energized. The

normally open contacts close causing blower to operate.

The circuit between R and Y is also complete. This completed circuit

causes contactor in outdoor unit to close which starts compressor and

outdoor fan.

HEATING

When thermostat calls for heating and FAN switch is set on AUTO, the

circuit between R and W is complete. The heater sequence SEQ is

energized which closes contacts of relay. There will be a time delay. This

completed circuit energizes all heating elements HTR and blower motor.

Heat Pump

COOLING

On a call for cooling, the thermostat makes circuits R-O, R-Y, and R-G.

Circuit R-O energizes reversing valve, switching it to cooling position.

Circuit R-Y energizes contactor starting outdoor fan motor and

compressor. Circuit R-G energizes indoor unit blower relay starting

indoor blower motor.

When thermostat is satisfied, its contacts open de-energizing contactor

reversing valve and blower relay. This stops compressor and fan motors.

HEATING

On a call for heating, the thermostat makes circuits R-Y and R-G. Circuit

R-Y energizes contactor starting outdoor fan motor and compressor.

Circuit R-G energizes indoor blower relay starting blower motor.

Should temperature continue to fall, R-W circuit is made through

second-stage room thermostat bulb. Circuit R-W energizes a sequencer

bringing on supplemental electric heat.

When thermostat is satisfied, its contacts open de-energizing contactor

and sequencer. All heaters and motors should stop.

Control Board (contact FAST for part number)

This section of the service manual describes the PCB by examining the

functional operation of the PCB components.

Printed Circuit Board (PCB) Component

Layout of the actual PCB is depicted in Fig. 1.

1. The low-voltage stripped leads are used to connect the 24V side of

transformer to indoor thermostat and outdoor section.

2. A 5A fuse is used to protect the low-voltage transformer secondary.

3. The fan relay is controlled by thermostat and turns fan on and off.

4. A plug is used as the connection for PCB power and electric

heaters. Note the pin numbers on plug.

5. A time-delay relay circuit keeps fan motor running for

approximately 90 seconds after G is de-energized. The time-delay

can be defeated by cutting jumper JW1.

Unit Functions

TRANSFORMER

1. Proper Wiring of Transformer Primary or High Side—Yellow wire

from Molex plug is wired to C terminal on transformer and black

wire from PCB relay (normally-open) terminal is wired to 208V or

230V terminal on transformer. Units are factory wired at 230V

terminal.

2. Proper Wiring of Transformer Secondary or 24V Side—Red wire

of transformer is wired to T terminal on PCB and brown wire of

transformer is wired to C terminal on PCB.

NOTE: T terminal on PCB is used to protect the transformer. T terminal

is connected through the fuse to R terminal on PCB.

INDOOR FAN

1. Wiring—Indoor fan motor yellow lead is wired to C terminal on

transformer. The red, blue, or black speed lead is wired to SPT

terminal on fan relay part of PCB. Units are factory wired on

medium speed (blue lead connected).

NOTE: Unused fan speed leads must be capped or taped off to prevent

direct short to cabinet surface.

2. Functional Control

a. Thermostat and Relay Control—When thermostat calls for the

fan in cooling, heat pump, heating, or fan-only mode, a 24VAC

signal is sent to relay. This causes the relay to close its normally

open contacts, turning on fan. When thermostat no longer calls

for the fan, the signal sent to relay is turned off and relay opens

causing fan to turn off after a 90-second fan-off delay.

b. Sequencer/Electric Heat Relay Interlock—The fan will also

operate whenever there is a call for electric heat, even if fan relay

is not energized. This happens because fan is interlocked with

first stage of electric heat through the normally-closed contact of

fan relay.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

NOTE: The fan interlock is only connected to first stage electric heat

(W2). W3 and E do not contain an interlock with fan. See outdoor

thermostat installation instructions when electric heat staging is desired.

ELECTRIC HEAT

When thermostat calls for electric heat, a 24VAC signal is sent to

sequencer/heat relay through W2, causing first stage to turn on. W3 and

E also receive signal if wired in with W2. If W3 and E are not wired to

W2, the sequencers/heat relays can be controlled individually to stage

additional electric heat. The sequence control is described in the

following section:

1. W2—When thermostat sends a signal to W2, a 24VAC signal is

applied across sequencer/relay No. 1, causing it to close. When

sequencer/relay No. 1 closes, first stage of electric heat is

energized. In straight electric heat, fan is also energized through the

normally closed contacts of fan relay. In cooling, heat pump, or

manual fan mode, fan will already be running since fan relay would

have been energized. When thermostat stops calling for electric

heat, the 24VAC signal to sequencer/relay No. 1 turns off and

sequencer opens after a delay of 60 to 90 seconds. Heaters equipped

with relays will be de-energized immediately. When

sequencer/relay opens, first stage of heat turns off along with fan,

providing thermostat is not calling for the fan.

2. W3—When a signal is sent to W3, a 24VAC signal to

sequencer/relay No. 2 causes it to close, with second stage of

electric heat turning on. The 24VAC signal applied to

sequencer/relay No. 1 causes fan to operate. Timing is such that

sequencer/relay No. 1 will turn on before sequencer/relay No. 2.

When signal to W3 is turned off, sequencer/relay No. 2 opens. If

W2 is also satisfied, first stage of electric heat and fan will also turn

off, providing thermostat is not calling for the fan.

3. E—When thermostat sends a signal to E, a 24VAC signal is sent to

sequencer/relay No. 3. The 24VAC signal applied to

sequencer/relay No. 3 turns on third stage of electric heat. The

24VAC signal applied to sequencer/relay No. 1 turns on first stage

of electric heat and fan. When thermostat stops calling for electric

heat, the signal to sequencers/relays 1, 2, and 3 are turned off, and

sequencers/relays open. This causes electric heat to turn off with

fan, providing thermostat is not calling for the fan.

NOTE: Electric heaters are factory wired with all stages tied together. If

independent staging is desired, consult outdoor thermostat installation

instructions, or corporate thermostat instructions.

TROUBLESHOOTING THE PRINTED CIRCUIT BOARD

Use wiring schematics shown in Figure 1 as a guide in troubleshooting

PCB unless otherwise noted.

IF FAN WILL NOT TURN ON FROM THERMOSTAT:

IF THERE IS NO HIGH VOLTAGE TO TRANSFORMER:

1. Check plug/receptacle connection. This supplies power from

heaters to PCB Fan Relay. Be sure plug is connected properly.

2. Check sequencer/relay No. 1 and plug wiring. Yellow wire should

be connected to Pin No. 9 of plug and to limit switch. Black wire

should be connected to Pin No. 7 of plug and to sequencer/relay #1.

3. Check field power leads L1 and L2. If these are not receiving

power, system cannot function.

IF TRANSFORMER HAS HIGH VOLTAGE APPLIED TO IT:

1. Check low-voltage transformer leads R (red) and C (brown). Be

sure they are wired to correct locations.

2. Check output voltage of transformer secondary side R (red) and C

(brown). Be sure transformer output is between 18VAC and

30VAC. If transformer output is incorrect and transformer is

receiving correct input voltage (208V or 230V), then transformer

needs to be replaced with recommended transformer. If no problem

exists with transformer secondary, proceed to items 3 and 4.

3. Check low-voltage fuse shown in Fig. 1. If fuse is blown, replace it

with an identical 5-amp fuse. The transformer cannot supply power

to board with fuse blown or loose. If fuse blows when unit has

power applied to it, the system most likely has one of the following

problems:

a. Check all 24V wiring for an electrical short.

b. The maximum load on transformer is 40VA. If load on

transformer is excessive, the low-voltage 5A fuse will blow to

protect transformer. If load exceeds VA rating of transformer, a

larger VA rated transformer needs to be installed. Check

sequencers/relays for excessive current draw.

c. Check wiring of heaters. If a heater is miswired, fuse may blow.

If a heater is miswired, correct miswiring by comparing it to

heater wiring label.

4. Check connections on primary side of transformer. If they are not

connected properly, the transformer secondary cannot supply the

24V signal to energize fan relay. If transformer is receiving correct

primary voltage but is not putting out correct secondary voltage,

transformer needs to be replaced.

IF ELECTRIC HEAT STAGES WILL NOT TURN ON, BUT FAN

WILL TURN ON:

IF THERE IS NO HIGH VOLTAGE TO TRANSFORMER:

1. Check plug connection between heaters and board. This supplies

power to transformer and fan. Be sure plug is connected properly.

2. Check sequencer/relay No. 1 and plug wiring. Yellow wire should

be connected to Pin No. 9 of plug and to limit switch. Black wire

should be connected to Pin No. 7 of plug and to sequencer/relay #1.

3. Check incoming high-voltage power leads. If these are not

receiving power, system cannot function.

IF TRANSFORMER HAS VOLTAGE APPLIED TO IT:

1. Check low-voltage transformer leads R (red) and C (brown). Make

sure they are wired to correct location. The unit will not function

without proper connections.

2. Check output voltage of transformer secondary side R (red) and C

(brown). If transformer output is low (less than 18VAC), refer to

items 3 and 4 of previous “If Transformer Has High Voltage

Applied To It” section.

IF TRACES ARE OVERHEATED ON BACK OF PCB:

Usually whenever a trace is blown on PCB, it means either there has

been a high-voltage short or high voltage has been applied to

low-voltage circuit. This can be prevented by making sure PCB is wired

correctly before PCB has power applied to it.

IF TRANSFORMER FUSE KEEPS BLOWING:

When low-voltage fuse blows, it means transformer would have blown if

fuse had not been in circuit to protect it. The fuse usually blows when

there is a high current draw on transformer, high voltage applied to

low-voltage circuit, or a direct secondary short. When there is a high

current draw on transformer, it is most likely because transformer has

been shorted or system is trying to draw more VA than transformer

rating allows. When fuse blows because of high voltage, the system has

mixed high- and low-voltage signals.

1. Check wiring of sequencers/relays as shown in Fig. 1. Be sure

transformer is not shorting out because thermostat wires are

miswired.

2. Check wiring of relays as shown in Fig. 1. Be sure low-voltage and

high-voltage wiring is correct.

3. Check VA draw on transformer. If VA draw is more than VA rating

of transformer, fuse will blow. If this is the case, replace

transformer with one that has a higher VA rating and meets system

specifications.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

IF FAN RUNS CONTINUOUSLY:

1. If PCB has no low-voltage power, check blue and black fan leads.

These may be switched at sequencer/relay.

2. If PCB has low-voltage power, check fan relay to see if it is opening

and closing. It may be stuck in the normally closed position due to

debris in relay.

TRANSFORMER FAILURE:

Check 208V and 230V transformer connections. They may be miswired.

A03010

Fig. 1 – Fan Coil Printed Circuit Board (contact FAST for part number)

A13032

Fig. 2 – Electric Heater Control Box

FEM4P, FEM4X, FEV, FJM, FXM4, REM4P,

REM4X, WAHA, WAPM, WAPT, WAPL, WAHM,

WAHT, WAHL, WAXM, WAXT, WAXL, WBHL

MULTI-SPEED ECM FAN MOTOR

The multi-speed ECM motor used with this product contains two parts:

the control module and the motor winding section. Do not assume the

motor or module is defective if it will not start. Go through the steps

described below before replacing control module or entire motor. The

control module is available as a replacement part.

It is normal for the motor to rock back and forth on startup. Do not

replace the motor if this is the only problem identified.

IF THE MOTOR IS NOT RUNNING:

1. Check for proper high voltage and ground at the L,G, and N

connections at the motor. Correct any voltage issue before

proceeding to the next step.

2. The motor is communicated through 24VAC signals to the 1,2,3,4,5

and C (common) terminals. Not all taps are programmed, if low

voltage is applied to an non-programmed terminal, the motor will

not operate, which is normal. Verify the part number of the motor

matches the correct replacement motor part number for the unit

model number.

3. Initiate a demand from the thermostat and check the voltage

between C (common) and terminal 1- 5. If voltage is present and

the motor isn’t operating, then the motor/control module is failed.

PRIOR TO INSTALLING THE REPLACEMENT CONTROL

MODULE, THE MOTOR SECTION CONDITION NEEDS TO BE

VERIFIED.

1. Check to see if the blower wheel spins freely.

2. To check for short to ground, use an ohmmeter to measure the

resistance from any one of the motor connector pins to the

CPC-E

94V-0

LR40061

HSCI

5 AMP

SPT

R10

R11

C1C2

JW1

FAN

RELAY

312753

T-O-D 60TX11

HH19ZA945

C9725

L145-55F

312753

T-O-D 60TX11

HH19ZA945

C9725

L145-55F

SPT

FAN

RELAY

5PULL TO OPEN

WARNING

ELECTRIC SHOCK

HAZARD

DISCONNECT

REMOTE POWER

SUPPLY BEFORE

OPENING PANEL.

322861-101 REV. A

FF1E CONTROL BOX

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

aluminum end plate of the motor. This resistance should be greater

than 100,000 ohms.

3. Check the motor phase-to-phase resistance between each of the

leads in the three-pin motor connector. The lead-to-lead resistance

across any two leads should be less than 20 ohms. Each lead-to-lead

resistance should be the same within ± 10 percent.

IMPORTANT: If any motor fails any of the three tests, do not install a

new control module. The new control can fail if placed on a defective

motor.

The prior fan coil models with multi-speed ECM blower motors used a

printed circuit board, similar to the PSC models. The current fan coils do

not use the printed circuit board and rely on the motor control

programming to provide the off-delay timing.

Another design aspect of the control board was to provide a resistor in

the “G” circuit in case a power stealing thermostat was used. This

resistor is no part of the wiring harness, as shown on wiring diagram.

The resistor is a 2-Watt, 1500-ohm resistor.

If the resistor has failed open, a likely cause is due to the power stealing

thermostat. Connecting C (common) may resolve the issue. Having an

open resistor should not affect the operation of the motor.

Fan Speed Selection

The fan speed selection is done at the motor connector. Units with or

without electric heaters require a minimum CFM. Refer to the unit

wiring label to ensure that the fan speed selected is not lower than the

minimum fan speed indicated.

To change motor speeds disconnect the BLUE fan lead from motor

connector terminal No. 2 (factory default position) and move to desired

speed-tap; 1, 2, 3, or 5.

Speed-taps 1, 2, and 3 have a 90-second blower off time delay

pre-programmed into the motor. Speed-tap 4 is used for electric heat

only (with 0 second blower time delay) and the WHITE wire should

remain on tap 4. Speed-tap 5 is used for high static applications, but has

a 0-second blower time delay pre-programmed into the motor. See

Airflow Performance tables for actual CFM. Also, see Fig. 4 for motor

speed selection location.

NOTE: In low static applications, lower motor speed tap should be used

to reduce possibility of water being blown off coil.

† electric heat airflow is same CFM as Tap 3, except 0 sec off delay

‡ high static applications, see airflow tables for max airflow

A11048

Fig. 3 – Motor Speed Selection

A13028

Fig. 4 – FVM4 motor/ECM 5.0 Motor

FVM4

Constant Air Flow

Unlike fan coils using induction motors where static pressure affects

airflow, these fan coils are constant airflow units. The blower delivers

requested airflow regardless of static pressure. Consult fan coil

Specification Sheet for static pressure limits. The ECM 5.0 is

pre-programmed and contains airflow tables for all modes of operation.

Blower characteristics (requested airflow, torque, and speed) are known

Table 1 – Speed Selection Taps

Tap 1 Low 90 sec off delay

Tap 2 Medium 90 sec off delay

Tap 3 High 90 sec off delay

Tap 4 Electric heat † 0 sec off delay

Tap 5 Max ‡ 0 sec off delay

1 2 3 4 5

Speed Taps may be located on motor,

or on plug close to motor.

CLGN

1 2 3 4 5

NAMEPLATENAMEPLATE

LABELLABEL

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

from laboratory testing If any two characteristics are known, the third is

defined.

Requested airflow is known from Easy Select Board configuration and

thermostat signals. Torque is known because it is directly related to

stator current, which is measured by motor control. Speed is measured

by counting back EMF pulses from stator windings. This information is

entered into an expression that calculates torque from speed and airflow

numbers. If calculation does not match stored blower characteristics,

torque is adjusted until agreement is reached. This calculation and

adjustment is performed every 0.8 seconds while motor is in operation.

There is no direct measure of static pressure, but unit does react to a

change in static to maintain constant airflow. A change in pressure will

result in a change in stator speed and torque. The motor will begin to

adjust on the next sampling, calculate new desired speed and torque, and

adjust as necessary.

INTEGRATED CONTROLS AND MOTOR ECM 5.0

An ECM 5.0 is fed high voltage AC power through the 5-pin connector

(Fig. 3). The AC power is then internally rectified to DC by a diode

module. After rectification, DC signal is electronically communicated

and fed in sequential order to three stator windings. The frequency of

these commutation pulses determines motor speed. The rotor is

permanently magnetized.

An ECM 5.0 is powered with high voltage at all times. The motor will

not run with high voltage alone. Low voltage must be applied to control

plug to run motor.

ECM 5.0 Control Power

The ECM 5.0 control power is supplied from R circuit through printed

circuit runs to motor control Connector (Pin 8), through motor control

harness to motor. The C side of low-voltage control power circuit is

connected by printed circuit runs to motor Connector (Pins 9, 10, and 11)

then through motor control harness to motor.

Low-Voltage Circuit Fusing and Reference

The low-voltage circuit is fused by a board-mounted 5-amp

automotive-type fuse placed in series with transformer SEC2 and R

circuit. The C circuit of transformer is referenced to chassis ground

through a printed circuit run at SEC1 connected to metal standoff

marked.

NOTE: The PCB must be mounted with two screws and motor ground

lead secured to blower housing or erratic motor operation can result.

Transformer, Motor, and Electric Heater Power Connection

Transformer high voltage supplied from electric heater package or high

voltage leads through 12-pin heater connector plug2/recp2. The ECM

5.0 power connections are made at the transformer primary terminals.

The transformer secondary connections are made at SEC1 and SEC2

connectors.

PCB LAYOUT AND DESCRIPTION

NOTE: Layout of actual PCB is depicted in Fig. 5.

The Easy Select Board is the interface between the ECM motor and

other system components. The board offers choices of electric heater

size, outdoor unit size and type, comfort or efficiency settings, on and off

delay profiles, and continuous fan speed. The installer should select the

correct size of components that are being installed in each installation. If

no selections are made, the factory default settings are for the largest

heater, largest outdoor unit, AC system type, nominal airflow adjust, and

0/90 time delay.

NOTE: Outdoor unit model should have an AHRI rating with the

variable speed fan coil. Some outdoor unit models will not work

properly with this fan coil.

Power for system is supplied from a 230VAC, 60-Hz line. Class 2

voltage (24VAC nom.), used for thermostat connections, is derived from

transformer located in close proximity to PCB. The 24VAC secondary

circuit includes 5A automotive-type fuse in SEC2 circuit.

Connection to heater panel is made through 12-pin connector PL-1.

Connections to thermostat are made at screw terminals. Twenty-one pin

terminals comprise field select taps for motor.

Fuse Data: 5A automotive-type ATC/ATO (tan) at 32VAC, 200 percent

current opening time of five seconds maximum.

Electrical Connections

Twenty-one 0.110-in pin terminals are used to provide programming

selections for operating modes of ECM 5.0. The 6 selection modes are

listed below. For additional information, refer to Easy Select

Configuration Taps section.

• AUX Heat Range—(Violet Wire)

• AC/HP Size—(Blue Wire) Type—(Orange Wire)

• AC/HP CFM Adjust—(Black Wire)

• AC/HP Time Delay—(Grey Wire)

• Continuous Fan—(Yellow Wire)

SEQUENCE OF OPERATION

Continuous Fan Mode

The thermostat closes circuit R to G. The unit delivers the airflow

selected for fan only operation.

Cooling Mode—Single Speed or Two-Speed High

Thermostat closes circuits R to G, R to Y/Y2 and R to O (heat pump

only). A circuit R to Y1 is required for two-speed high operation.

Airflow delivered the airflow selected by AC/HP SIZE selection and

CFM ADJUST selection.

Cooling Mode—Two-Speed Low

Thermostat closes R to G and R to Y1 and R to O (heat pump only). Unit

delivers two-speed low airflow for AC/HP SIZE and CFM ADJUST

selected.

Cooling + Dehumidify Mode

J1 jumper must be pulled from Easy Select Board. Control closes R to G,

R to Y/Y2, and R to O (heat pump only) and open R to DH.

Dehumidification is active when 24VAC is removed from DH terminal.

Unit delivers 20 percent less airflow.

Super Dehumidify Mode

This mode is only activated when the control closes R to Y/Y2, R to O

(heat pump only) and opens R to DH and R to G. This signals the fan coil

to run at minimum airflow for maximum humidity removal. The control

will cycle the equipment 10 minutes on and 10 minutes off until

satisfied.

Table 2 – Motor and Modules

Model Size Motor Type Current Blower Motor P/N Required Control Module

Replacement Kit Number

FVM4X2400 (Series B) ECM 5.0 1185246 1185326

FVM4X3600 (Series B) ECM 5.0 1185247 1185327

FVM4X4800 (Series B) ECM 5.0 1185248 1185328

FVM4X6000 (Series B) ECM 5.0 1185249 1185329

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

A96430

Fig. 5 – Easy Select Board 1185358

A96431

Fig. 6 – Easy Select Board Schematic

Table 3 – FVM4X Connections and Connectors

Type Connection Type Connector Pin # Description

Heater Connection 12-Pin

Pin #1 Common to screw terminal G

Pin #2 Common to screw terminal Y/Y2 through diode D3

Pin #3 Common through Y1 through diode D2

Pin #4 Common to W2 screw terminal

Pin #5 Common to W2 screw terminal

Pin #6 Common to W1 screw terminal

Pin #7 Common to W1 screw terminal

Pin #8 R 24Vac

Pin #9 Common to transformer C

Pin #10 Common to transformer C

Pin #11 Common to transformer C

Pin #12 Common to DH screw terminal

YYWWX

AUX/HEAT KW/CFM

AC/HP SIZE

AC/HP CFM ADJUST

ON/OFF DELAY

CONTINUOUS FAN

HEATER/MOTOR

AUX1 HUM1

AUX2

24VAC

HUM2

LO MED HI YEL

SYSTEM TYPE

SEC1

EASY SELECT

SEC2

5 AMP.

MAX.

D5D2

CES0130035-00

STI

YEL

PL1

GRY

WHT

BLK

ORN

BLU

VIO

0-30

1075

0-20

875

0-10

725

0-5

625

036 030 024 018

AC HP-COMFORT HP-EFF

NOM LO HI

ENH

Y/Y

AUX1

SYSTEM DIAGRAM

HEATER/MOTOR

SEC1 SEC2

5 AMP J1

Y/Y2

HUM1

AUX2

HUM2

DIODE

LOGIC

AUX HEAT

KW/CFM AC/HP

SIZE SYSTEM

TYPE AC/HP CFM

ADJUST ON/OFF

DELAY CONTINUOUS

FAN

GRY

1/4"

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Heat Pump Heating Mode — Single Speed or Two-Speed High

Thermostat closes R to Y/Y2 and R to G. A circuit R to Y1 is required

for two-speed high operation. The unit delivers airflow selected by

AC/HP SIZE selection and CFM ADJUST selection. Selected delay

profile is active in this mode.

Heat Pump Heating Mode — 2-Speed Low

Thermostat closes R to G and R to Y1. Unit delivers two-speed low

airflow for AC/HP SIZE and CFM ADJUST selected. Selected delay

profile is active in this mode.

Non-Staged Auxiliary with Heat Pump Heating Mode

Thermostat should already have closed R to G, R to Y2 for heat pump

heating operation. With J2 jumper in place, energizing either W1 or W2

will produce the W2 airflow. This is the greater of heat pump heating

and auxiliary heat airflow plus an additional 15 percent. The elected

delay profile is not active in this mode.

Staged Auxiliary Heat with Heat Pump Heating Mode

The auxiliary heat can be staged by removing the J2 jumper that ties W1

and W2 terminals together. Staging can be done by using outdoor

thermostats or by using the heat staging option where the indoor control

can be configured for three-stage electric heat. The unit will

automatically adjust airflow when the different stages of heat are

energized. The airflow delivered will depend on the heat pump size

selected and electric heat size selected. The greater of the two airflows

will be delivered. The selected delay profile is not active in this mode.

Electric Heat without Heat Pump

Thermostat closes R to W and thermostat should be set up to energize G

with W. This is due to the Super Comfort Heat programming in the

motor. Energizing W without G will result in 25% lower airflow

delivery. The selected delay profile is not active in this mode.

EASY SELECT CONFIGURATION TAPS

The Easy Select taps are used by installer to configure system. The ECM

5.0 uses selected taps to modify its operation to a pre-programmed table

of airflows. Airflows are based on system size and mode of operation

and those airflows are modified in response to other inputs such as the

need for de-humidification (Fig. 5).

The FVM4 Fan Coils must be configured to operate properly with

system components with which it is installed. To successfully configure

a basic system (see information printed on circuit board located next to

select pins), move the six select wires to pins which match components

used, along with homeowner preferences.

Auxiliary Heat Range

The installer must select the auxiliary heat airflow approved for

application with kW size heater installed. Each select pin is marked with

a range of heaters for which airflow (also marked) is approved. For

increased comfort select the narrowest kW range matching the heater

size, for example, 0–10 for a 10 kW heater. This airflow must be greater

than the minimum CFM for electric heater application with the size

system installed for safe and continuous operation. Note that airflow

marked is the airflow which will be supplied in emergency heat mode

and heating mode on air conditioners when electric heat is primary

heating source. To ensure safe heater operation in heat-pump heating

mode, when electric heaters are energized, the ECM 5.0 will run the

higher of heat pump airflow and electric heater airflow. The factory

default selection is largest heater range approved (Fig. 5).

AC/HP Size

The factory default setting for air conditioner or heat pump size is largest

unit meant for application with model of fan coil purchased. The

installer needs to select air conditioner or heat pump size to ensure that

airflow delivered falls within proper range for size of unit installed in all

operational modes (Fig. 5).

Unpack unit and move to final location. Remove carton taking care not

to damage unit. Inspect equipment for damage prior to installation. File

claim with shipping company if shipment is damaged or incomplete.

Locate unit rating plate which contains proper installation information.

Check rating plate to be sure unit matches job specifications.

System Type

The type of system must be selected.

1. AC—air conditioner (approx. 350 CFM/ton)

2. HP–COMFORT—provides lower airflow than air conditioner

selection (approximately 315 CFM/ton) in heating mode. In cooling

mode supplies 350 CFM/ton.

3. HP–EFF—provides same airflow for heat pump heating and

cooling modes (approximately 350 CFM/ton).

The factory setting is AC (Fig. 5).

AC/HP CFM Adjust

Select low, nominal, or high airflow. The factory selection is NOM. The

adjust selections HI/LO will regulate airflow supplied for cooling and

heat pump heating modes only, +15 percent and -10 percent respectively.

The adjust selection options are provided to adjust airflow supplied to

meet individual installation needs for such things as noise, comfort, and

humidity removal (Fig. 5).

ON/OFF Delay

NOTE: ON/OFF Delay is active only in cooling and heat pump only

heating modes. In auxiliary heat mode or emergency heat mode, the ON

delay is 0 seconds and the OFF delay is fixed and cannot be overridden.

Select desired time delay profile. Four motor-operation delay profiles are

provided to customize and enhance system operation (Fig. 5). The

selection options are:

1. The standard 90-seconds off delay (factory setting 0/90).

2. No delay option used for servicing unit or when a thermostat is

utilized to perform delay functions (0/0).

3. A 30-seconds on/90-seconds off delay profile used when it is

desirable to allow system coils time to heat up/cool down prior to

airflow. This profile will minimize cold blow in heat pump

operation and could enhance system efficiency (30/90).

4. ENH, enhanced selection provides a 30-seconds on/150-seconds off

at 70 percent airflow and no off delay.

Table 4 – Typical Operating Modes

Operating Mode Terminals Energized

Heat Pump Only Heating R, Y/Y2, G, DH

Heat Pump Only Heating + Super Comfort Heat Mode R, Y/Y2, DH

Heat Pump Heating + Auxiliary Heat (non-staged) R, Y/Y2, G, DH, W2

Cooling R, Y/Y2, G, DH, O

Cooling + Dehumidification R, Y/Y2, G, O

Cooling + Superdehumidification R, Y/Y2, O

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Continuous Fan

Select desired continuous-fan profile LO, MED, or HI. Airflow are

provided to customize and enhance the continuous fan functions (Fig. 5).

The possible selections are:

1. LO—provides 50 percent of Y/Y2 Cool airflow.

2. MED—provides 65 percent of Y/Y2 Cool airflow (71 percent on 5

ton model).

3. HI—provides 100 percent of Y/Y2 Cool airflow.

The factory setting is LO.

NOTE: If applied to two-speed unit, do not select continuous fan as HI

since low speed cooling will also run at HIGH airflow and insufficient

dehumidification may result.

Easy Select Board Jumpers

J1—This jumper must be pulled to activate dehumidification mode. The

jumper connects R to DH. With the jumper in, the DH terminal is always

energized. With the jumper pulled, the DH terminal is de-energized. A

thermostat capable of a DEHUM feature must be used to supply the 24V

signal when there is no call for dehumidification, and turn off the 24V

when there is a call for dehumidfication.

J2—This jumper activates heat staging. The jumper connects the W1

and W2 terminals together. If either is energized, W2 airflow is

delivered. With the jumper pulled, there are separate airflows for W1 and

W2.

Airflow Delivery

These units deliver airflow depending on the system size selections and

operating mode. The thermostat energizes a combination of terminals on

the Easy Select Board which tells the motor what CFM to deliver. The

following are typical operating modes and the terminals that should be

energized on the Easy Select Board.

NOTE: The DH terminal on the Easy Select Board is for

dehumidification. It is de-energized on a call for dehumidification.

Variable Speed Motor Logic Sequence:

The ECM motors in these fan coils are programmed to deliver a variety

of airflows. The motor goes through:

COOLING

The nominal cooling airflow for these fan coils is 350 CFM per ton.

Selecting the HI adjust tap increases the airflow to 400 CFM per ton.

The LO tap decreases airflow to 315 CFM per ton. The low adjustment

is only active during normal cooling mode. Removing the signal from

the DH terminal reduces the airflow to 80 percent of cooling airflow.

Removing the G signal which initiates Superdehumidification and

reduces the airflow to 50 percent of cooling.

HEATING

The base heat pump only heating airflow is determined by the SYSTEM

TYPE selection on the Easy Select Board. If HP–EFFICIENCY is

selected, the airflow is the same as Cooling. IF HP–COMFORT is

selected, the airflow is 315 CFM per ton. The airflow will adjust up if

necessary when auxiliary heating is required. When both the Y/Y2 and

W1 or W2 terminals are energized, the motor will run the higher of the

heat pump or electric heat airflows. Super Comfort Heat mode is

initiated when the indoor control removes the G signal from the board.

This slows the motor to 75 percent of heat pump airflow. If the CFM

adjust is set to LO, it will deliver 67.5 percent of heat pump airflow

during Super Comfort Heat mode.

TROUBLESHOOTING

Troubleshooting Easy Select Board (FVM4)

If Traces Are Overheated on Back of PCB:

Usually whenever there is a trace broken on PCB, it means either there

has been a high-voltage short or high voltage has been applied to

low-voltage circuit. This can be prevented by making sure PCB is wired

correctly before fan coil has power applied to it.

If PCB Fuse Keeps Blowing:

When low-voltage fuse blows, it means transformer would have blown if

fuse had not been in circuit to protect it. The fuse usually blows when

there is a high current drawn on transformer, high voltage applied to

low-voltage circuit, or a direct secondary short. When there is a high

current drawn on transformer, it is most likely because transformer has

been shorted or system is trying to draw more VAC than transformer

rating allows. When fuse blows because of high voltage, the system has

mixed high and low-voltage signals.

1. Check transformer and thermostat wiring (Fig. 5). Be sure the

transformer is not shorting out because thermostat wires are

miswired.

2. Check wiring of relays (Fig. 5). Be sure low-voltage and

high-voltage wiring are connected to proper sequencers.

3. Check VA draw on transformer. If VA draw is more than VA rating

of transformer, fuse will blow. If this is the case, replace

transformer with one that has a higher VA rating.

Troubleshooting Common Problems

Airflow Too Low:

Y1 instead of Y/Y2 on single-speed air conditioner or heat pump

application—Y1 input is only for two-speed applications. Using this

terminal will deliver about 60 percent of full cooling airflow.

Wrong Easy Select Board selection—Selecting an outdoor unit or

electric heater smaller than actually installed will result in low airflow

for the application.

G not energized with call for cooling or heating—This triggers Super

Comfort Heat or SuperDehumidify mode which delivers 50 percent of

cooling airflow.

J1 jumper pulled with no dehumidistat installed—The J1 jumper ties the

DH terminal to R and is installed at the factory. When pulled, a

dehumidistat supplies a 24V signal to DH when there is no call for

dehumidification (reverse logic). When there is no signal on DH, the

motor reduces airflow to 80 percent for better dehumidification.

Airflow Too High:

Wrong Easy Select Board selection—Fan coil is factory set for the

largest outdoor unit and largest electric heater. Select sizes that are

actually installed.

Continuous fan set too high for two-speed applications—Set to MED or

LO.

Motor Will Not Stop:

The off delay on any W call is one minute and cannot be overridden.

Some power-stealing thermostats could bleed enough voltage to cause

motor to run slowly when there is no heating or cooling call. Disconnect

thermostat wires and wait two minutes to see if motor stops. If it stops,

replace thermostat, or install resistor per thermostat installation

instructions.

Motor Will Not Start:

See following section, “Troubleshooting ECM 5.0 Motor and Controls.”

Troubleshooting ECM 5.0 Motor and Controls

The ECM/ICM motor used with this product contains two parts: the

control module and the motor winding section. Do not assume the motor

CAUTION

ELECTRICAL OPERATIONS HAZARD

Failure to follow this caution may result in equipment damage or

improper operation.

High voltage is always present at motor. Disconnect power to unit

before removing or replacing connectors or servicing motor. Wait at

least five minutes after disconnecting power before opening motor.

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or module is defective if it will not start. Go through the steps described

below before replacing control module, Easy Select Board or entire

motor. The control module is available as a replacement part.

If Motor Turns Slowly:

1. It is normal operation to run noticeably slower if G terminal is not

energized in cooling or heat pump heating modes.

2. Attach blower access panel. Motor may appear to run slowly if

access panel is removed.

If Motor Does Not Run:

Turn power off, wait five minutes and check the following:

1. With power turned off, check 5A fuse on Easy Select Board.

2. Check all plugs and receptacles for any deformation or corrosion

that could cause bad connections. Be sure plugs are fully seated.

Turn power back on and check the following:

3. Check for 24VAC on SEC1 and SEC2. If no voltage is present,

check transformer.

4. Verify that approximately 230VAC is present at motor.

5. Verify low voltage control signals to motor according to procedure

below.

Use Following Procedure to Check Low Voltage Signals:

The ECM motor in these fan coils receive low voltage signals from the

Easy Select Board through the wiring harness assembly. The

combination of pins energized at the motor determines the speed the

motor will run. The procedure below isolates the fan coil from all

external devices such as a thermostat, condensing unit, humidifier or

electronic air cleaner. There is also a specific troubleshooting example to

demonstrate the process. Table 8 provides information needed to verify

that the correct voltages are present at the motor and the Easy Select

Board.

THERMOSTAT:

1. Remove all thermostat and accessory wires from Easy Select

Board.

2. On Easy Select Board, jumper screw terminals (1 at a time): R-G,

R-Y/Y2, R-Y1, R-W1, R-W2. If motor runs in all cases, check

thermostat outputs. Thermostat wires may be broken, or thermostat

may be miswired, configured incorrectly, or defective. If the motor

does not run, or runs in some cases, but not others, continue this

procedure to check wiring harness and circuit board.

WIRING HARNESS:

1. Remove 16-pin plug from motor.

2. Check for appropriate voltages on 16-pin connector with screw

terminals jumpered (Table 3).

3. If signals check correctly, and motor does not run, inspect wiring

harness for loose pins or damaged plastic that could cause poor

connections.

4. If connections are good, either control module or motor is

defective.

5. If proper signals are not present, check circuit board using

procedure below:

12-PIN PLUG (PL-1) ON EASY SELECT BOARD:

1. Completely disconnect wire harness from Easy Select Board.

2. Jumper the screw terminals one at a time; R-G, R-Y/Y2, R-Y1,

R-W1, R-W2 and check for appropriate voltages on the Easy Select

Board pins. If proper signals are not present, replace Easy Select

Board. If proper signals are present at the pins and not at 16-pin

connector to the motor, the wiring harness is defective.

TROUBLESHOOTING EXAMPLE:

Motor is not running on a call for heat pump heating after jumpering the

Easy Select Board screw terminals as described in Thermostat section

above.

With all thermostat wires removed from Easy Select Board, place a

jumper wire between R and Y/Y2 low-voltage screw terminals on the

Easy Select Board.

1. Check Table 5 for pin number on 16-pin connector associated with

the Y/Y2 signal. The correct pin is #14. The far right column of

Table 5 shows that (-)12VDC should be present between Pin #14

and Pin #1 (common) on the 16-pin connector.

2. Set meter to read DC voltage. Place meter leads between Pins #1

(common) and #14 and check for (-)12VDC. If signal is present, the

problem is in the module or motor. If signal is not present, the

problem is either in wiring harness or Easy Select Board.

These steps can be repeated for other modes of operation.

To Check Easy Select Board:

1. Leave jumper wire in place between R and Y/Y2.

2. Check Table 5 under “Volt Meter on Easy Select Board Plug”

column and row for Pin #14 on motor plug to see pin number on

Easy Select Board that should have voltage. The correct pin is #2.

The column on far right will show voltage that should be present

between Pin #2 and Pin #9 (common).

3. Place meter leads between Pins #2 and #9 on Easy Select Board and

check for (-)12VDC.

4. If voltage is present, the wiring harness is bad. If not, the Easy

Select Board is bad.

Verify Motor Winding Section:

Before proceeding with module replacement, check the following to

ensure motor winding section is functional. With control module

removed and unplugged from winding section:

1. The resistance between any two motor leads should be similar.

2. The resistance between any motor lead and the unpainted motor end

plate should be greater than 100,000 ohms.

If motor winding fails one of these tests, it is defective and must be

replaced.

Dehumidify Mode

NOTE: Humidistat must open on humidity rise.

Latent capacities for systems using the FVM4 fan coils are better than

average systems. If increased latent capacity is an application

requirement, the field wiring terminal block provides connection

terminals for use of a standard humidistat. The FVM4 fan coils will

detect the humidistat contacts opening on increasing humidity and

reduce its airflow to approximately 80 percent of nominal cooling mode

airflow. This reduction will increase the system latent capacity until the

humidity falls to a level which causes the humidistat to close its contacts.

When the contacts close, airflow will return to 100 percent of the

selected cooling airflow. To activate this mode, remove jumper J1 and

wire in a standard humidistat. Carefully consult product airflow data for

cooling and dehumidification modes.

CAUTION

ELECTRICAL OPERATION HAZARD

Failure to follow this caution may result in equipment damage or

improper operation.

DO NOT remove or apply 5-pin plug on motor with power on. Arcing

could occur, which can damage control module

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

A95316

Fig. 7 – Humidistat Wiring for De-Humidify Mode

FCM4

Model FCM4 fan coil is designed to be installed with the Observer™

communicating wall control. The FCM4 fan coil will provide airflow at

a rate commanded by the Observer wall control. The nominal

airflow/ton rate is 350 CFM/ton. The Observer wall control will modify

the commanded airflow under certain operating modes. Refer to the

Observer wall control literature for further system control details. This

fan coil will not respond to commands from a common thermostat

except under certain emergency situations explained in this document.

ELECTRONICALLY COMPUTED MOTOR ECM 3.0

An ECM 3.0 is fed high voltage AC power through the 5-pin connector.

The AC power is then internally rectified to DC by a diode module.

After rectification, DC signal is electronically communicated and fed in

sequential order to 3 stator windings. The frequency of these

communication pulses determines motor speed. The rotor is permanently

magnetized.

ECM 3.0 CONTROL POWER

The ECM 3.0 control power is supplied from R circuit through printed

circuit runs to motor control connector Plug #1, Pin #1, through motor

control harness to motor. The C side of low-voltage control power circuit

is connected by printed circuit runs to motor connector Plug #1, Pin #2

then through motor control harness to motor. A digital signal is sent from

Plug #1, Pins #3 and #4 to communicate with the motor including all

airflow requirements.

LOW-VOLTAGE CIRCUIT FUSING AND REFERENCE

The low-voltage circuit is fused by a board-mounted 5-amp automotive

type fuse placed in series with transformer SEC2 and R circuit. The C

circuit of transformer is referenced to chassis ground through a printed

circuit run at SEC1 connected to metal standoff.

NOTE: The PCB must be mounted with two screws and motor ground

lead secured to blower housing or erratic motor operation can result.

TRANSFORMER, MOTOR, AND ELECTRIC HEATER POWER

CONNECTION

Transformer high voltage supplied from electric heater package or high

voltage leads through 12-pin heater connector plug/recp2. The ECM 3.0

power connections are made at the transformer primary terminals. The

transformer secondary connections are made at SEC1 and SEC2

connectors.

TROUBLESHOOTING

NOTE: Always check high and low voltage supply to the fan coil

components. Check the integrity of the plug receptacle connections and

fan coil wiring harness prior to assuming a component failure.

LED Description:

LEDs built into fan coil control provide installer or service person

information concerning operation and/or fault condition of the fan coil

control and ECM motor. This information is also available at the

Observer wall control in text with basic troubleshooting instructions.

Careful use of information displayed will reduce the need for extensive

manual troubleshooting.

The amber LED located at bottom center of control adjacent to motor

harness plug is Motor Status LED, and it is labeled MOTOR. A second

amber LED, located in upper right center of control adjacent to System

Communications connector (DX+, DX-, C, R), is the System Status

LED, and it is labeled STATUS. The green LED labeled COMM is also

located adjacent to System Communications connector, below STATUS

LED, and is used as an indicator of system communications status.

Status Codes will be displayed on the STATUS LED using the following

protocol:

1. The number of short flashes indicates first digit of code.

2. The number of long flashes indicates second digit of code.

3. A short flash is 0.25 seconds on. A long flash is one second on.

4. The time between flashes is 0.25 seconds.

5. The time between last short flash and first long flash is 1 second.

6. The LED will be off for 2.5 seconds before repeating code.

Fan Coil Control Start-Up and System Communications

Troubleshooting:

On power up, green COMM LED will be turned off until successful

system communications are established (this should happen within 10

seconds). Once communications with Observer wall control are

successful, COMM LED will be lit and held on. At the same time, amber

STATUS LED will be lit and held continuously on until a request for

operating mode is received. The STATUS LED will be on any time fan

coil is in idle mode.

If, at any time, communications are not successful for a period exceeding

two minutes, fan coil control will only allow emergency heating or

cooling operation using a common thermostat, a non-communicating

outdoor unit and the R, C, Y, O, W outdoor unit terminal strip

Table 5 – TFVM4 Motor Control Test Values (with 16-pin Connector at Motor Unplugged)

Terminals

Jumpered Volt Meter on 16-pin Harness Plug Volt Meter on 12-pin

Easy Select Board Plug Voltage

+ - + -

R to W1 Pin #2 Pin #1 Pin #7 Pin #924VAC

R to W2 Pin #13 Pin #1 Pin #4 Pin #924VAC

R to Y1 Pin #6 Pin #1 Pin #3 Pin #9(-)12VDC

R to Y/Y2 Pin #14 Pin #1 Pin #2 Pin #9(-)12VDC

R to G (LO) Pin #15 Pin #1 Pin #3 Pin #90VAC

R to G (MED) Pin #6 Pin #1 Pin #3 Pin #9(-)12VDC

R to G (HI) Pin #14 Pin #1 Pin #2 Pin #9(-)12VDC

EASY SELECT

BOARD TERMINAL

BLOCK

HUMIDISTAT

REMOVE

JUMPER

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

connections and will display Status Code 16, System Communication

Fault, on amber STATUS LED. No further fan coil troubleshooting

information will be available at Observer wall control until

communications are re-established.

If COMM LED does not light within proper time period and status code

is not displayed:

1. Check system transformer high and low voltage to be sure the

system is powered.

2. Check fuse on fan coil control to be sure it is not blown. If fuse is

open, check system wiring before replacing it to be sure a short

does not cause a failure of replacement fuse.

If COMM LED does not light within proper time period and status code

is displayed:

Check system wiring to be sure Observer wall control is powered and

connections are made DX+ to DX+, DX- to DX-, etc. and wiring is not

shorted. Mis-wiring or shorting of the DX+, DX-, C, R communications

wiring will not allow successful communications.

NOTE: Shorting or mis-wiring low voltage system wiring will not cause

damage to fan coil control or Observer wall control but may cause low

voltage fuse to open.

ECM Motor Troubleshooting

The ECM motor used in this product consists of two parts: the control

module and the motor winding section. Do not assume motor or module

is defective if it will not start. Use the designed-in LED information aids

and follow troubleshooting steps described below before replacing

motor control module or entire motor. Motor control module is available

as a replacement part.

A12231

Fig. 8 – FCM4 ECM 3.0 Motor

VERIFY MOTOR WINDING SECTION:

Before proceeding to replace a motor control module:

1. Check motor winding section to be sure it is functional.

2. Remove motor control module section and unplug winding plug.

Motor shaft should turn freely, resistance between any two motor

leads should be similar and resistance between any motor lead and

unpainted motor end should exceed 100,000 ohms.

3. Failing any of these tests, entire ECM motor must be replaced.

4. Passing all of the tests, motor control module alone can be replaced.

MOTOR TURNS SLOWLY:

1. Low static pressure loading of blower while access panel is

removed will cause blower to run slowly, particularly at low airflow

requests. This is normal, do not assume a fault exists.

2. Recheck airflow using Observer wall control service screens with

access panel in place.

NOTE: Blower motor faults will not cause a lockout of blower

operation. Fan coil control will attempt to run the blower motor as long

as the Observer wall control maintains a demand for airflow. Fan coil

control will not operate electric heaters while a fault condition exists.

The fan coil control communicates with the motor at least once every

five seconds, even when the motor is idle. If, during operation, the fan

coil control does not communicate with the motor for more than 25

seconds, the motor will shut itself down and wait for communications to

be reestablished.

Using Motor LED in Troubleshooting

The MOTOR LED is connected to the blower motor communication line

and works with the fan coil control microprocessor and the STATUS

LED to provide fan coil operation and troubleshooting information.

When the motor is commanded to operate, the MOTOR LED will be

turned on and will flash each time instructions are sent to the motor.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death or

possible equipment damage.

After disconnecting power from the ECM motor, wait at least five

minutes before removing the control section. Internal capacitors require

time to discharge. Minor injury from electrical shock may result from

early contact with live metal parts.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

When the motor is commanded to stop, the MOTOR LED will be turned

off.

If the MOTOR LED is lit, flashing and the motor is running or if the

MOTOR LED is off and the motor is stopped, operation is normal and

no motor fault exists.

If the MOTOR LED is lit, flashing and the motor does not run, or if the

MOTOR LED is off and the motor is running, check the STATUS LED

for the Status Code. Refer to the troubleshooting instructions for the

indicated Status Code in Section E, Fan Coil Troubleshooting.

Fan Coil Troubleshooting

Fan coil faults indicated by flashing codes on the amber system STATUS

LED can be resolved using troubleshooting information provided below.

Codes are listed in order of their priority, highest to lowest. Though

multiple faults can exist at any time, only the highest priority code will

be displayed on STATUS LED. Clearing the indicated fault when

multiple faults exist will cause the next highest priority Status Code to be

flashed. All existing faults, as well as a fault history, can be viewed at

Observer wall control.

STATUS CODE 45, CONTROL BOARD TEST FAULT:

Fan coil control has failed internal start-up tests and must be replaced.

No other service procedure will correct.

STATUS CODE 37, HEATER OUTPUT SENSED “ON” WHEN NOT

ENERGIZED:

Fan coil control is provided with circuitry to detect presence of a 24VAC

signal on Electric Heater stage 1 and stage 2 outputs.

If fan coil control detects a 24VAC signal on either heater stage output

and it is not supplying signal, Status Code 37 will be displayed on

STATUS LED. Fan coil control will turn off output and command

blower motor to supply an airflow determined to be safe for current

operation mode with electric heaters energized.

To find the fault:

1. Stop all system operations at Observer wall control and check

heater stage 24VAC outputs.

2. Disconnect electric heater at plug/receptacle 2 and check heater

wiring for faults. See Status Code 36 for more information.

STATUS CODE 44, MOTOR COMMUNICATION FAULT:

The MOTOR LED is connected to the blower motor communication line

and works with the fan coil control microprocessor and STATUS LED to

provide fan coil operation and troubleshooting information.

When motor is commanded to operate, the MOTOR LED will be turned

on and will flash each time instructions are sent to the motor.

When the motor is commanded to stop, the MOTOR LED will be turned

off. The MOTOR LED will not flash to indicate communications when it

is turned off.

Fan coil control is constantly communicating with the motor, even when

the motor and MOTOR LED are off. If motor does not acknowledge

receipt of communications, the control will display Status Code 44 on

STATUS LED and continue to try to communicate with the motor. If

motor acknowledges communication, status code will be cleared.

If MOTOR LED is lit and flashing and motor does not run:

1. Check the STATUS LED. If STATUS LED is indicating a Status 44

code, check the motor wiring harness for proper connection to

control and motor receptacles.

2. Check motor wiring harness to be sure all wiring complies with

wiring diagram description, makes a complete circuit from

connector to connector and is not shorted.

3. Check 12VDC low-voltage supply to motor at Pins #1 (+) and #2

(-) of motor header connection to fan coil control.

If all checks are normal, fan coil control is good and control module on

motor may need replacement. Check motor and Motor Control Module

following the instructions in ECM Motor Troubleshooting on pg 12.

Shorted or mis-wiring of the low voltage motor harness wiring will not

cause damage to fan coil control or to motor control module.

If the MOTOR LED is off, STATUS LED is indicating a Status Code 44

and motor is running:

Disconnect the motor harness at the fan coil control. If motor continues

to run, fan coil control is good and control module on motor may need

replacement

STATUS CODE 25, INVALID MOTOR / MODEL SELECTION:

On initial start-up, fan coil control shall poll motor for its size data and

check fan coil size data stored in fan coil control memory.

1. If motor size is incorrect for fan coil size or fan coil size data is

invalid, Status Code 25 will be displayed on STATUS LED.

2. If model size data is missing (as is the case when a replacement fan

coil control is installed), Observer wall control will prompt installer

to enter correct model size from a list of valid sizes.

3. If motor size is incorrect for model size, motor must be replaced

with proper size motor. Fan coil control will not respond to

operation requests until this fault condition is resolved.

STATUS CODE 27, INVALID OUTDOOR UNIT SIZE:

On initial power-up, fan coil control will write into memory outdoor unit

size as provided by Observer wall control in a fully communicating

system.

1. If outdoor unit size is invalid, Status Code 27 will be displayed on

STATUS LED.

2. If model size data is missing (as is the case when a replacement

outdoor control is installed), Observer wall control will prompt the

installer to choose size from a list of valid sizes for application with

fan coil.

3. Check communications wiring to be sure Observer wall control has

established communications with outdoor unit or select proper size

from valid size list provided at Observer wall control.

4. Check motor and motor control module following the instructions

in ECM Motor Troubleshooting on pg 12.

STATUS CODE 26, INVALID HEATER SIZE:

On initial power-up, fan coil control will write into memory electric

heater size as read from heater if heater is provided with Identifier

Resistor (IDR). Heater size must be valid for combination of indoor and

outdoor components installed. Fan coil control will read IDR value

connected to Pins 5 and 8 of heater harness connector. If no resistor is

found, Observer wall control will prompt installer to select heater size

installed from a list of valid heater sizes for fan coil and outdoor unit size

installed.

If heater ID resistor value read is invalid, Status Code 26 will be

displayed on STATUS LED.

If heater installed is equipped with a resistor connected to Pins 5 and 8 of

heater harness connector and Status Code 26 is displayed on STATUS

LED:

1. Check wiring harness connections to be sure connections are

secure.

2. If symptoms persist, disconnect wiring harness at fan coil control

heater header and check for a resistance value greater than 5000

ohms.

3. Check for proper wiring of resistor assembly.

4. Make sure heater size installed is an approved size for outdoor unit

and fan coil sizes installed.

NOTE: Fan coil control will not operate electric heater until this Status

Code is resolved. If the heater size is set through the Observer wall

control, the heater will be operated as a single stage heater. If staging is

desired, the IDR value must be read in by the fan coil control.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

STATUS CODE 36, HEATER OUTPUT NOT SENSED WHEN

ENERGIZED:

Fan coil control is provided with circuitry to detect presence of a 24VAC

signal on Electric Heater stage 1 and stage 2 outputs.

If fan coil control energizes either heater stage and does not detect the

24VAC signal on output, Status Code 36 will be displayed on the

STATUS LED Fan coil control will continue to energize heater output(s)

and adjust blower operation to a safe airflow level for energized electric

heat stage(s).

To find the fault, check for 24VAC on heater stage outputs. Fan coil

control or sensing circuit may be bad.

NOTE: It may be useful as an electric heater troubleshooting procedure

to disconnect the system communications to force Status Code 16

enabling of emergency heat mode. It is difficult to know which heater

output is energized or not energized in normal operation. When fan coil

is operated in emergency heat mode using electric heaters, both outputs

are energized and de-energized together. Terminal strip inputs to control

can then be connected R to W to turn on both electric heat outputs.

Heater output sensing circuits can then be checked to resolve Status

Code 36 or 37 problems.

STATUS CODE 41, BLOWER MOTOR FAULT:

If MOTOR LED is lit and flashing and motor does not run:

1. Check STATUS LED. If STATUS LED is indicating Status Code

41, motor control has detected that the motor will not come up to

speed within 30 seconds of being commanded to run or that the

motor has been slowed to below 250 rpm for more than 10 seconds

after coming up to speed. Motor wiring harness and fan coil control

are operating properly, do not replace.

2. Check to be sure that the blower wheel is not rubbing the housing.

3. Check motor to be sure that the motor shaft is not seized (motor

control module must be removed and electronics disconnected from

windings to perform this check properly).

4. Check motor windings section following instructions in ECM

Motor Troubleshooting on pg 12.

If all these checks are normal, the motor control module may need

replacement.

STATUS CODE 16, SYSTEM COMMUNICATION FAULT:

If, at any time, system communications are not successful for a period

exceeding two minutes, the fan coil control will only allow emergency

heating or cooling operation using a common thermostat, a

non-communicating outdoor unit, and the R, C, Y, O, W outdoor unit

terminal strip connections and will display Status Code 16 on the amber

STATUS LED (see Emergency Heating and Cooling Modes on pg 14).

No further fan coil troubleshooting information will be available at the

Observer wall control until communications are reestablished.

Check system wiring to be sure the Observer wall control is powered and

connections are made DX+ to DX+, DX- to DX- etc. and wiring is not

shorted. Mis-wiring or shorting of the DX+, DX-, C, R communications

wiring will not allow successful communications. Correcting wiring

faults will clear the code and reestablish communications.

Shorting or mis-wiring the low voltage system wiring will not cause

damage to fan coil control or to Observer wall control but may cause the

low voltage fuse to open.

STATUS CODE 46, BROWNOUT CONDITION:

If the secondary voltage of the transformer falls below 15VAC for a

period exceeding four seconds, Status Code 46 will be displayed on

STATUS LED.

If system includes a non-communicating outdoor air conditioner or heat

pump, the Observer wall control will command the fan coil to turn off Y

output controlling compressor.

When secondary voltage rises above 17VAC for more than four seconds,

the brownout condition is cleared and normal system operation will

resume subject to any minimum compressor off delay function which

may be in effect. Brownout does not affect blower or electric heater

operation.

STATUS CODE 53, OUTDOOR AIR TEMPERATURE SENSOR

FAULT:

If an OAT sensor is found at power-up, input is constantly checked to be

within a valid temperature range. If sensor is found to be open or shorted

at any time after initial validation, Status Code 53 will be displayed at

amber STATUS LED.

Check for faults in wiring connecting sensor to OAT terminals. Using an

Ohmmeter, check resistance of thermistor for a short or open condition.

If thermistor is shorted or open, replace it to return the system to normal

operation. If fault is in the wiring connections, correcting the fault will

clear the code and return the system to normal operation.

NOTE: If fault condition is an open thermistor or a wiring problem that

appears to be an open thermistor and the power to the fan coil control is

cycled off, the fault code will be cleared on the next power-up but the

fault will remain and system operation will not be as expected. This is

because on power-up, the fan coil control cannot discern the difference

between an open sensor or if a sensor is not installed.

Emergency Heating and Cooling Modes

Fan coil control can provide emergency heating or cooling using a

common heat/cool thermostat in the event that there are no system

communications, fault is in Observer wall control and no replacement is

immediately available.

To activate these modes, the thermostat and outdoor unit must be wired

as a common heating/cooling system to fan coil control RYWC

terminals. Fan coil control must be powered and displaying Status Code

16, System Communication Fault.

NOTE: These emergency modes do not provide the level of comfort and

efficiency expected by the consumer and should only be activated when

Observer wall control cannot be replaced immediately.

SEQUENCE OF OPERATION

The FCM4 fan coil is designed for installation with Observer

communicating wall control. This fan coil will not respond to commands

provided by a common thermostat except under certain emergency

situations described in the Start Up and Troubleshooting sub-section.

The Observer wall control uses temperature; humidity and other data

supplied from indoor and outdoor system components to control heating

or cooling system for optimum comfort.

ADVANCED TROUBLESHOOTING:

Troubleshooting the FCM4 Fan Coil Circuit Board:

The circuit board Fan Coil part number 1184554

Primary test that should be performed:

Motor Line Voltage Check

1. Turn off power (240V).

2. Remove Plug 3 from ECM motor.

3. Turn on power.

Table 6 – FCM4 Self-Identifying Resistor Values

Heater Size kW Resistor Ohms Nominal

No heater Open

9 11k

15 18k

20 24k

24 33k

30 39k

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

4. Check Plug 3, terminals 4 and 5, to ensure there are 240V.

5. Turn off power.

6. Reconnect Plug 3 to motor.

The following troubleshooting techniques will assist in determining the

correct component to replace when the Fan Coil Board presents a Fault

Code 44 or 41:

1. Disconnect power from the unit (240V).

2. Disconnect the DX+, DX-, C, R connector from the board.

3. Disconnect Plug 1 from the board (Fig. 10).

4. Turn on power (240V).

5. After reestablishing power, you should receive Fault Code 44, and

the motor LED should be off.

6. Place a jumper across the R and G terminals on the low voltage

terminal block.

7. Fault Code 44 should still be flashing.

8. The Motor LED should be flashing, indicating the board is able to

transmit a signal to the motor.

9. If Motor LED is not flashing, check to ensure that 24V is present

across R and C on the low voltage terminal block and that there is a

good connection with the R and G jumper.

10. If 24V is present and the jumper/connections are good,

11. Replace the board.

Check Board

1. If Fault Code 44 and the Motor LED are both flashing, place a DC

voltmeter across terminals PL1-1 Red (+) to PL1-2 Green (-)

(Fig. 10).

2. Across terminal PL1-1 and PL1-2, a 12VDC should be present. If

12VDC is not present, replace circuit board.

3. If Fault Code 44 is flashing and the Motor LED is flashing, place a

DC voltmeter across terminal PL1-3 (+) and PL1-2 (-).

4. Across terminal PL1-3 (+) and PL1-2 (-), the DC volt meter should

display 5VDC. The voltage should be very stable and should not

fluctuate more than 0.02VDC. If the voltage fluctuates, get a

different voltmeter before proceeding to the following steps.

5. Reconnect Plug 1 to circuit board and connect DC voltmeter across

terminals PL1-3 Yellow (+) and PL1-2 Green (-). Does the voltage

appear to fluctuate more than in step 15? Typical voltmeters will

show a fluctuation of 2VDC to 1VDC. The amount of fluctuation is

not important. You could see even more fluctuation depending on

the voltmeter used.

A13030

Fig. 9 – FCM4 Circuit Board LED Locations

A13031

Fig. 10 – ECM/Plug Wiring Diagram

6. Check the blower motor serial output signal. The blinking LED on

the control board represents the serial output signal. You can

measure the signal with a DC voltmeter by removing Plug 1 from

the circuit board and connecting the DC voltmeter across PL1-4 (+)

and PL1-2 (-). The voltage should be near 0Vdc but it will fluctuate

briefly several times per second. If you have an analog voltmeter,

the needle briefly will go high several times per second. If you have

a digital voltmeter with a bar graph, it will show a large change in

magnitude on the bar graph several times per second. If you have a

plain, digital voltmeter, it will show a brief fluctuation in voltage,

and the magnitude may vary depending on the voltmeter used.

FMA4P, WAMA, FMA4X, WAXA

FAN MOTOR

FMA4P, WAMA

The FMA4P and WAMA motor is three-speed ECM direct drive.

High-speed lead is black, medium-speed lead is red, low-speed lead is

blue, and common lead is purple. Be sure proper blower speed has been

selected.

The motor is turned on through two different routes. The first occurs

when thermostat calls for the fan in cooling, heat pump, or fan-only

mode. A 24VAC signal is sent to relay, causing relay to close its

normally open contacts, turning fan on.

The second occurs when there is a call for electric heat. A 24VAC signal

is sent to heater sequencer/relay, causing it to close, directing 230V

through the normally closed contact of fan relay, turning fan on. The fan

remains on until sequencer/relay opens.

If motor does not run, test motor for an open winding or a winding

shorted to motor case. If either is present, replace motor.

FMA4X, WAXA

The FMA4X and WAXA motor is five-speed direct drive. The cooling

speed tap is selected by connecting the green wire to the desired motor

tap number indicated on the motor plug. For the electric heat fan speed

selection connect the white wire to the desired motor tap number

indicated on the motor plug.

Status

LED

Communication

LED

Motor

LED

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

Before installation or servicing system, always turn off main power to

system. There may be more than one disconnect switch. Turn off

accessory heater power if applicable. Lock out and tag switch with a

suitable warning label.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

The blower motor in this unit has blower-on and blower-off delays. The

blower-on delay is 0-30 seconds and will keep the motor running after a

heating or cooling call ends.

If motor does not run, test motor for an open winding or a winding

shorted to motor case. If either is present, replace motor.

ELECTRIC HEATER SERVICE

Service can be completed with heater in place. Shut off power before

servicing.

TIME DELAY

FMA4X have time delay built into the motor logic. FMA4P units with

date codes prior to V1515 have sequencers. FMA4P units with date

codes V1515 or later have a time delay printed circuit board.

The Time Delay Printed Circuit Board (PCB) is a logic controlled time

delay activated by low-voltage control signal (G) from thermostat. The

PCB includes a normally open relay which closes to energize the blower

motor when the G terminal is energized. When the G terminal is

de-energized the relay energizing the blower motor remains closed for

90-100 seconds before opening.

SEQUENCE OF OPERATION

NOTE: The following sequence of operation is based on units installed

with PSC motor and Time Delay Printed Circuit Board (PCB), See

Fig. 11, Fig. 12 and Fig. 13. For units with ECM motor, the off-delay is

programmed into the motor. Follow Table 7 below, ECM Motor Speed

Taps & the corresponding blower off delays for each speed tap.

Continuous Fan

Thermostat closes R to G. G energizes and completes circuit to indoor

blower motor. When G is de−energized, there is a 90s blower off-delay.

Cooling Mode

Thermostat energizes R to G, R to Y, and R to O (heat pump only). G

energizes and completes indoor blower motor. Y energizes outdoor unit

(O is energized for heat pump). When cooling call is satisfied, G is

de−energized, there is a 90s blower off-delay.

Heat Pump Heating Mode

Thermostat energizes R to G and R to Y. G energizes and completes

circuit to indoor blower motor. When heating call is satisfied, G is

de−energized, there is a 90s blower off-delay.

Heat Pump Heating with Auxiliary Electric Heat

Thermostat energizes R to G, R to Y, and R to W1. G energizes and

completes circuit to indoor blower motor. W1 energizes electric heat

relay(s) which completes circuit to heater element(s). When W1 is

de−energized, electric heat relay(s) open, turning off heater elements.

When G is de−energized there is a 90s blower off-delay.

Electric Heat or Emergency Heat Mode

Thermostat closes R to W1. W1 energizes electric heat relay(s) which

completes circuit to heater element(s). Blower motor is energized

through normally closed contacts on fan relay. When W1 is

de−energized, electric heat relay(s) opens, there is no blower off-delay.

(units with ECM motor will have a blower off delay based on motor

speed tap selection).

A150455

Fig. 11 – Time Delay PCB Schematic

Fig. 11 Comments:

1. The THR and THC are connect to transformer output:

2. When the G has signal. The FAN will supply 24VAC power to

control fan relay.

3. When the G signal gone. The FAN will stop 24 VAC output after

90 seconds.

4. CN3, CN7 are dummy connection terminals.

A150462

Fig. 12 – 18 & 24 PCB

Table 7 – Speed Tap and Delay-Off Time

Speed Tap Delay-Off Time

Tap 1 30

Tap 2 90

Tap 3 30

Tap 4 90

Tap 5 30

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

A150463

Fig. 13 – 30 & 36 PCB

Limit Switch

Refer to Electric Heater Kit Function and Troubleshooting section of this

manual.

Sequencer

Early EHK2 heater kits include sequencers instead of relays. Refer to

Electric Heater Kit Function and Troubleshooting section of this manual.

Transformer

A 40VA transformer supplies 24V power for control circuit. Check for

208/230V on primary side of transformer. If present, check for 24V on

secondary side.

NOTE: Transformer is fused. Do not short circuit.

Fan Relay

Later EHK2 heater kits include sequencers instead of relays. Relay coil

is 24V. Check for proper control voltage. Replace relay if faulty.

CLEANING OR REPLACING REFRIGERANT

FLOW-CONTROL DEVICE

FMA4P, WAMA

The FMA4P and WAMA piston can be removed and cleaned if believed

to be plugged. This unit’s piston is unique and replacements are

available from FAST.

The filter drier should be located on the liquid line at the indoor unit to

prevent particulate from plugging the piston.

FMA4X, WAXA

The FMA4X and WAXA fan coils use an R-410A TXV. The TXV’s are

preset at the factory and do not need adjustment for reliable operation.

Reference the outdoor unit instructions to properly charge the unit to the

correct subcooling. For optimal performance, adjust the TXV so that 6º

F of superheat is measured at the outdoor unit’s vapor service valve

when the indoor return air is 80º F DB/67º F WB and outdoor ambient is

82º F DB. To increase superheat turn the TXV adjustment stem

clockwise no more than one rotation at a time. After an adjustment is

made, wait until the superheat temperature has been stable for 15

minutes before making further adjustments.

SEQUENCE OF OPERATION

Condensing Unit

COOLING

When thermostat calls for cooling, the circuit between R and G is

complete and single-pole single-throw relay FR is energized. The

normally open contacts close causing blower to operate.

The circuit between R and Y is also complete. This completed circuit

causes contactor in outdoor unit to close which starts compressor and

outdoor fan. When thermostat is satisfied, its contacts open

de-energizing contactor and blower relay. This stops compressor and

outdoor fan motor. The indoor fan motor will stop after 90-100 seconds

on the FMA4P and 30 or 90 seconds on the FMA4X.

HEATING

When thermostat calls for heating and FAN switch is set on AUTO, the

circuit between R and W is complete. The heater sequence SEQ is

energized which closes contacts of relay. There will be a time delay. This

completed circuit energizes all heating elements HTR and blower motor.

When thermostat is satisfied, its contacts open de-energizing contactor

and blower relay. This stops compressor and outdoor fan motor. The

indoor fan motor will stop after 90-100 seconds on the FMA4P and 30 or

90 seconds on the FMA4X.

Heat Pump

COOLING

On a call for cooling, the thermostat makes circuits R-O, R-Y, and R-G.

Circuit R-O energizes reversing valve, switching it to cooling position.

Circuit R-Y energizes contactor starting outdoor fan motor and

compressor. Circuit R-G energizes indoor unit blower relay starting

indoor blower motor.

When thermostat is satisfied, its contacts open de-energizing contactor

reversing valve and blower relay. This stops compressor and outdoor fan

motor.

HEATING

On a call for heating, the thermostat makes circuits R-Y and R-G. Circuit

R-Y energizes contactor starting outdoor fan motor and compressor.

Circuit R-G energizes indoor blower relay starting blower motor.

Should temperature continue to fall, R-W circuit is made through

second-stage room thermostat bulb. Circuit R-W energizes a sequencer

bringing on supplemental electric heat.

When thermostat is satisfied, its contacts open de-energizing contactor

and sequencer. All heaters should stop. The indoor fan motor will stop

after 90-100 seconds on the FMA4P and 30 or 90 seconds on the

FMA4X.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

A13135B

Fig. 14 – FMA4, WAMA, WAXA (sizes 18 & 24) Expanded View- Case

A13136

Fig. 15 – FMA4, WAMA, WAXA (sizes 18 & 24) Expanded View- Duct Components, Blower & Electrical Parts

NOTE: Time Delay PCB replaced Time delay relay in newer production models.

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

A13137B

Fig. 16 – FMA4, WAMA, WAXA (sizes 18 & 24) Expanded View- Evaporator Parts & Drain Pan

NOTE: Time Delay PCB replaced Time delay relay in newer production models.

A13138B

Fig. 17 – FMA4, WAMA, WAXA (sizes 30 & 36) Expanded View- Case

(FMA4X & WAXA use TXV, not shown)

FCM4, FEV, FEM4, FJM, FMA4, FSA4, FSM4, FSU4, FVM4, FXM4, REM4, WAH, WAM, WAP, WAX, WBHL: Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

A13139

Fig. 18 – FMA4, WAMA, WAXA (sizes 30 & 36) Expanded View- Duct Components, Blower & Electrical Parts

NOTE: Time Delay PCB replaced Time delay relay in newer production models after V1515

A13140

Fig. 19 – FMA4, WAMA, WAXA (sizes 30 & 36) Expanded View- Evaporator Parts & Drain Pan

This manual suits for next models

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