Carrier FB4P User manual

Subject to change without notice
Installation Operation Maintenance Manual
Manufacturer’s Name: Saudi Airconditioning Manufacturing Co. Ltd.
Country of origin : Jeddah, Saudi Arabia
Nearest port of embarkation: Jeddah Islamic port
Product classification: Commercial and Residential
FB4P –50Hz
Nominal Cooling Capacity 1.5 –5.0 Tons
HFC R-410A Refrigerant
FB4P Direct Expansion multipoise fan coil units are available in 6 sizes with nominal cooling capacity range from 1.5 to
5.0 Tons. Each unit is designed to occupy a minimum space. No complex system controls are required for Carrier fan
coil units. Piping, drain, and wiring connections are readily accessible and mounting holes and slots are predrilled to
save installation time and field labor expense. They are compact and ready to fit where needed in the basement,
crawlspace, attic, utility room, or closet.
Contact your local Carrier representative for additional reference materials and information. www.carrier.com
FB4P Fan Coil Units –50Hz
Quality Assurance
Certificate Reg. No:
04 100 950420
Page 1 of 20

Table of Contents
Safety Considerations...................................................................................................................................................2
Physical Data / Electrical Data / Combination Matrix ...................................................................................................3
Unit Dimensional Drawing ............................................................................................................................................4
Introduction / Installation ..............................................................................................................................................5
Controller For Ducted Fan Coil Units..........................................................................................................................12
ECM Motor Troubleshooting.......................................................................................................................................14
Start-Up / Application and Accessories / Care and Maintenance...............................................................................15
Typical Wiring Schematic ...........................................................................................................................................16
R-410A Refrigerant Quick Reference Guide ..............................................................................................................17
Air Conditioner Troubleshooting Chart .......................................................................................................................18
Mandatory Startup Checklist and Record...................................................................................................................19
SAFETY CONSIDERATIONS
General
The appliance is not to be used by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction. Children
should be supervised not to play with the appliance.
Improper installation, adjustment, alteration, service, maintenance or use can cause explosion, fire, electrical shock
or other conditions which may cause personal injury or property damage. Consult a qualified installer; service
agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when installing. Follow all the safety codes. Wear safety glasses
and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes for
special requirements. In absence of local codes, it is recommended that the USA standard ANSI/NFPA 70,
National Electrical Code (NEC), be followed.
It is important to recognize safety information. This is the safety-alert symbol . When you see this symbol on
the unit and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words
DANGER, WARNING, CAUTION, and NOTE.These words are used with the safety-alert symbol. DANGER
identifies the most serious hazards which will result in severe personal injury of 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.
Installation Safety Considerations
After the unit has been received and when it is ready to be installed or reinstalled, it must be inspected for damage.
If damage is detected upon receipt, immediately file a claim with the shipping company or repair. This machine
must be installed in a location that is not accessible to the public and protected against access by non-authorized
people. This machine must not be installed in an explosive atmosphere.
Do not remove the skid or the packaging until the unit is in its final position. The units can also be lifted with slings,
using only the designated lifting points marked on the unit (labels on the chassis and a label with all unit handling
instructions are attached to the unit). Use slings with the correct capacity, and always follow the lifting instructions
on the certified drawings supplied for the unit.
Motors are permanently lubricated; use of any external lubricant (including WD40) is not allowed, For units without
factory supplied control it is the full responsibility of the user to install proper controls matching the unit’s design
and capable to carry components current, control wiring should be strictly follow local/national electrical codes (i.e.
using telephone wires or similar is prohibited). Safety is only guaranteed, if these instructions are carefully followed.
If this is not the case, there is a risk of material deterioration and injuries to personnel.
Warranty
Warranty is based on the general terms and conditions of the manufacturer. Any modifications to the design and/or
installation made without discussion with Carrier and without advance written agreement will result in the loss of the
right to any warranty claims and any claim for injury to personnel as a result of these modifications.
Page 2 of 20

Physical Data - FB4P Series
Unit Model 18 24 30 36 48 60
Unit size (Tons) 1.5 2 2.5 3.0 4.0 5.0
Motor HP
Coil Material (HP Tube)
Coil Material (Finplate)
Rows / Fins Per Inch 2 / 14.5 3 / 14.5 2 / 16
Metering Device
Piston Size 52 55 59 65 76 84
Filter Type
Filter Qty. / Size (mm)
Net Weight, kg 43.5 50.8 54.4 57.6 71.2 79.4
Electrical Data
FB4PSSF018000E
FB4PSSF024000E
FB4PSSF030000E
FB4PSSF036000E
FB4PSSF048000E
FB4PSSF060000E
Combination Matrix
Indoor Model Outdoor Model Indoor Model Outdoor Model
Fan Coil Top Discharge Fan Coil Side Discharge
FB4PSSF018000E 38CKPC18DS70 FB4PSSF018000E 38PKC18DS70
FB4PSSF024000E 38CKPC24DS70 FB4PSSF024000E 38PKC24DS70
FB4PSSF030000E 38CKPS30DS70 FB4PSSF030000E 38PKS30DS70
FB4PSSF036000E 38CKPC36DS70 FB4PSSF036000E 38PKS36DS90
FB4PSSF036000E 38CKPC36DS90 FB4PSSF048000E 38PKS48DS90
FB4PSSF048000E 38CKPS42DS90 FB4PSSF060000E 38PKS60DS90
FB4PSSF048000E 38CKPS48DS90
FB4PSSF060000E 38CKPS60DS90
For detailed performance and matchup ratings please refer to corresponding outdoor product catalog
Legend
15
Power Supply MCA MOCP
1 / 547 x 416.5 x 21
Vol - Max
2.6 3.3
Polyester Fiber
1 / 332 x 547 x 21
Refrigerant
Unit Dimensions
1 / 547 x 505.5 x 21
MOCP — Maximum Overcurrent Protection
FLA — Full Load Amps
4.8
6.8
MCA — Minimum Circuit Amps
1/3
5.4
3.8
3/4 1/2
3 / 14.5
Evaporator Coil
230V-1Phz-50Hz
Vol - Min
Aluminum
Bypass AccuRater
Indoor Model
207 253
Fan FLA
3/8" Dia. Copper Tube
Page 3 of 20

Unit Dimensional Drawing
Unit Connection Sizes:
- Suction: 030 & 060 – 𝟓𝟖
�"I.D Sweat
- Liquid: 𝟑𝟖
�"I.D Sweat
- Condensate: 𝟑𝟒
�"FPT
Unit
Size
Coil
Type
A B C D E
in.
mm.
in.
mm.
in.
mm.
in.
mm.
in.
mm.
018 Slope 42-11/16 1084.3 14-5/16 363.5 12-7/16 316.0 12-5/16 312.7 10-7/16 265.1
024 Slope 42-11/16 1084.3 14-5/16 363.5 12-7/16 316.0 12-5/16 312.7 10-7/16 265.1
030 Slope 47-11/16 1211.5 17-5/8 447.5 15-3/4 400.1 15-5/8 396.9 15-3/8 390.5
036 Slope 49-5/8 1260.5 17-5/8 447.5 15-3/4 400.1 15-5/8 396.9 15-3/8 390.5
048 A 49-5/8 1260.5 21-1/8 536.5 19-1/4 489.0 19-1/8 485.8 15-11/16 398.3
060 A 53-7/16 1375.3 21-1/8 536.5 19-1/4 489.0 19-1/8 485.8 19-1/2 495.3
Page 4 of 20

Introduction
This document contains general installation instructions for the FB4P unit Fan Coils. Refer to the unit-wiring
diagram installed on the control box or specific manufacturer literature for any other type of factory mounted
controls.
See drawings for unit configurations, dimensions, clearances, and pipe connections. Refer to unit wiring label
for all electrical connections; follow NEC (National Electrical Code) and local codes.
Receiving
FB4P fan coil units are shipped individually packed in carton boxes. When cartons are individually off loaded
from the truck, do not roll, nor throw, or drop the carton to avoid damage to the contents. Store boxes upright
as the symbols on the boxes indicated.
Inspection
Check the shipment against shipping list and remove unit from the carton and take off protective covering. If
the unit has been damaged, file claim with transportation company and notify Carrier immediately.
Protection
Protect unit from damage caused by job site debris. Do not allow dust, debris and water to get into the unit.
This will damage unit’s component and unit’s performance will be affected.
Preliminary Check
Following is a checklist which should be checked before the installation is started. The installer should be familiar
with each of the following requirements before the actual installation.
a) Space requirement and clearance
b) Ceiling or mounting strength.
c) Piping connections.
d) Condensate drain connection.
e) Power supply and wiring.
f) Air duct connections.
g) The condensing unit model number is the recommended by the factory (as per the below table).
Prepare Jobsite for Unit Installation
To save time and to reduce the possibility of costly errors, set up a complete sample installation in a typical room at
jobsite. Check all critical dimensions such as pipe, wire, and duct connection requirements. Refer to job drawings
and product dimension drawings as required. Instruct all trades in their part of the installation.
Identify and Prepare Units
Be sure power requirements match available power source. Refer to unit nameplate and wiring diagram.
1. Check all tags on unit to determine if shipping screws are to be removed. Remove screws as directed.
2. Rotate the fan wheel by hand to ensure that the fan is unrestricted and can rotate freely. Check for shipping
damage and fan obstructions.
Unit Configuration
The piping connections, drain pan outlet and control box are located on the right side of the unit facing the airflow
direction as factory standard as shown in the unit picture. Left hand side connection is factory option. However, the
connections side can be relocated at site.
Rigging and Unpacking
Unit should not be removed from carton until reaching final location to avoid damage. Inspect unit for shipping
damage and file claim with transportation company if necessary, check nameplate voltage against available
power supply. For special installation, consult local building and electrical codes.
Installation
Placing Unit in Position
1. Select the unit location. Allow adequate space for free air circulation, service clearances, piping and electrical
connections, and any necessary ductwork. For specific unit dimensions, refer to the submittal drawings.
Allow clearances according to the local and national electrical codes.
2. Be sure either the ceiling is able to support the weight of the unit. See physical data for nominal unit weight.
3. Move unit into position. Ensure unit is level or pitched towards drain to ensure proper drainage and operation.
4. Mounting units to the ceiling - When unit is lifted, access to the mounting holes is on the top panel of the unit.
Hanger rods, fasteners, and other required hardware must be field-supplied.
Page 5 of 20

Mount Unit
Unit can stand or lie on floor, or hang from ceiling or wall. Allow space for wiring, piping and servicing unit.
Important: When unit is installed over a finished ceiling and/or living area, building codes may require a field-
supplied secondary condensate pan installed.
Under the entire unit. Some localities may allow as an alternative the running of a separate secondary condensate
line. Consult local codes for additional restrictions or precautions.
A. Upflow Installation: If return air is to be ducted through a floor, set unit on floor over opening and use 1/8”
to 1.4” inch thick fireproof resilient gasket between duct unit and floor. Cut opening as per dimensions (See
Fig. 1). A field supplied bottom closure is required.
B. Downflow Installation: In this application, field conversion of the evaporator coil is required, using
accessory downflow kit. Along with an accessory base kit. See installation instructions packaged with
accessory kits. See product data for kit pan numbers.
C. Horizontal Installation: Units must not be installed with access panels facing up or down. All other units
are factory built for horizontal left installation. When suspending unit from ceiling, dimples in casing indicate
suitable location and screws for mounting metal support straps (See Fig. 2).
Fig - 1 Slope Coil Unit in Upflow Application
Note: Modular units can be dissembled and components moved separately to installation area for reassembly. This
process accommodates small scuttle holes and limiting entrances to installation sites. (See Fig. 3.)
For optimum condensate drainage performance in horizontal
installations, unit should be leveled along its length and width.
CAUTION
Page 6 of 20

Horizontal Right Conversion of Units with Slope Coils
1. Remove blower and coil access panels and fitting panel. (See Fig. 4.)
2. Remove coil mounting screw securing coil assembly to right-side casing flange.
3. Remove coil assembly.
4. Lay fan coil unit on its right side and reinstall coil assembly with condensate pan down. (See Fig. 4.)
5. Attach coil to casing flange using coil mounting screw previously removed.
7. Align holes with tubing connections and condensate pan connections, and reinstall access panels and fitting
panel. Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating. Install
after brazing.
Horizontal Right Conversion for 048 and 060
1. Remove blower and coil access panels. (See Fig. 5)
2. Remove metal clip securing fitting panel to condensate pan. Remove fitting panel.
3. Remove 2 snap-in clips securing A-coil in unit. Remove horizontal pan bracket and drain pan support by
removing the screw.
4. Slide coil and pan assembly out of unit.
5. Remove horizontal drain pan support bracket from coil support rail on left side of unit and reinstall on coil support
rail on right side of unit.
6. Convert air-seal assembly for horizontal right
a. Remove air -seal assembly from coil by removing 4 screws.
b. Remove air splitter (B) from coil seal assembly by removing 3 screws. (See Fig.5 - factory-shipped
inset.)
c. Remove filler plate (A) and install air splitter (B) in place of filler plate.
d. Install filler plate (A) as shown in horizontal right application.
e. Remove condensate (C) and install on opposite tube sheets.
7. Install horizontal pan on right side of coil assembly.
8. Slide coil assembly into casing. Be sure coil bracket on each comer of vertical pan engages coil support rails.
9. Reinstall 2 snap-in clips to correctly position and secure coil assembly in unit. Be sure clip with large offset is
used on right side of unit to secure horizontal pan.
10. Reinstall horizontal pan bracket, drain pan support and secure with a screw previously removed.
11. Remove knockout on right side of coil access panel.
12. Reinstall access and fitting panels, aligning holes with tubing connections and condensate pan connections.
Be sure to reinstall metal clip between fitting panel and vertical condensate pan. Make sure liquid and suction tube
grommets are in place to prevent air leaks and cabinet sweating.
Fig - 2 Slope Coil Unit in Horizontal Left Application
Page 7 of 20

Fig - 3 Removal of Brackets on Modular Unit
Fig - 4 Conversion for Horizontal Right Applications Using a Slope Coil
Page 8 of 20

Fig - 5 Conversion for Horizontal Right Applications Using A-Coil
Air Ducts
Connect the supply-air duct over the outside of the 3/4-in. flanges provided on the supply-air opening. Secure the
duct to the flange, using proper fasteners for the type of duct used, and seal the duct-to-unit joint. If return-air
flanges are required, install factory-authorized accessory kit. Use flexible connectors between ductwork and unit to
prevent transmission of vibration. When electric heater is installed, use heat-resistant material for flexible connector
between ductwork and unit at discharge connection. Ductwork passing through unconditioned space must be
insulated and covered with vapor barrier.
A. Ductwork Acoustical Treatment
Metal duct systems that do not have a 90° elbow and 10 ft of main duct to first branch takeoff may require internal
acoustical insulation lining. As an alternative, fibrous ductwork may be used if constructed and installed in
accordance with the latest edition of SMACNA construction standard on fibrous glass ducts. Both acoustical lining
and fibrous ductwork shall comply with National Fire Protection Association as tested by UL Standard IK I for Class
I air ducts.
Make Electrical Connections
Refer to unit nameplate for required supply voltage, fan and heater amperage and required circuit amp. Refer to
unit wire diagram for unit and field wiring. Make sure all electrical connections are in accordance with unit wiring
diagram and all applicable codes. The fan motor(s) should never be controlled by any wiring or device other than
the factory-supplied control board and remote control. All field wiring must be in accordance with governing codes
and ordinances. Any modification of unit wiring without factory authorization will invalidate all factory warranties and
nullify any agency listings.
- Select proper wall location to fix display pad
- Connect communication cable end to its location in the PCB as shown in the wiring diagram.
Follow local/national wiring regulations and code for all wiring to the unit, in absence of local codes use power
supply wires sizes which are at least 1.25 times the unit’s full load current and circuit breaker size 2 - 2.25 times
the unit’s full load current.
Page 9 of 20

NOTES:
1. The control kit is factory supplied, no thermostat required.
2. The wall mounted wired room controller can control all system functions without wireless remote control.
3. Standard wire length for the control board is 15 m. If extension is required, please contact your local carrier
dealer.
B. Ground Connections
Use UL-lifted conduit and conduit connector for connecting supply wire(s) to unit to obtain proper grounding.
Grounding may also be accomplished by using grounding lugs provided in control box.
Refrigerant Tubing
Use accessory tubing package or field-supplied tubing of refrigerant grade. Suction tube must be insulated. Do not
use damaged, dirty, or contaminated tubing because it may plug refrigerant flow-control device. ALWAYS evacuate
the coil and field-supplied tubing to 500 microns before opening outdoor unit service valves.
Fig – 6 Refrigerant Flow-Control Device Fig – 7 Recommended Condensate Trap
Wiring diagrams shown depict typical control functions.
Refer to unit wiring label for specific functions.
IMPORTANT
If a disconnect switch is to be mounted on the unit,
select a location where drill or fastener will not
contact electrical or refrigerant components.
CAUTION
Field wires on the line side of the disconnect found In the fan coil unit remain live, even
when the pull-out is removed. Service and maintenance to incoming wiring cannot be
performed until the main disconnect switch (remote to the unit) is turned off. Failure to
do so will result In electrical shock causing personal Injury or death.
WARNING
According to NEC, ANSI/NFPA 70, and local codes, the cabinet must have an uninterrupted or
unbroken ground to minimize personal injury if an electrical fault should occur. The ground may
consist of electrical wire or metal conduit when installed in accordance with existing electrical codes.
Failure to follow this warning could result in electric shock, fire, or death.
WARNING
Page 10 of 20

Fig – 8 Condensate Drain Fig – 9 Insufficient Condensate Trap
Refrigerant Flow-Control Device
Replace piston if required. Check piston size shown on indoor unit rating plate to see if it matches required
piston shown on outdoor unit rating plate. If it does not match, replace indoor piston with piston shipped with
outdoor unit. The piston shipped with outdoor unit is correct for any approved indoor coil combination.
Condensate Drains
Units are equipped with primary and secondary 3/4 in.FPT drain connections. To prevent property damage and
achieve optimum drainage performance. BOTH primary and secondary drain lines should be installed and include
properly-sized condensate traps. Be sure to install plastic push-in plugs in unused condensate drain fittings. It is
recommended that PV'C fittings be used on the plastic condensate pan. Do not over-lighten. Finger-tighten plus 1-
1/2 turns. Use pipe dope. NOTE: No secondary drain line on horizontal application for A-coil unit.
NOTE: When connecting condensate drain lines, avoid blocking filter access panel, preventing filter removal.
Prime both primary and secondary .condensate traps after connecting to drain pan.
If the unit is located in or above a living space where damage may result from condensate overflow, a field-
supplied, external condensate pan should be installed underneath the entire unit, and a secondary condensate line
(with appropriate trap) should be run from the unit into the pan. Any condensate in this external condensate pan
should be drained to a noticeable place.
As an alternative to using an external condensate pan. some localities may allow the running of a separate
3/4 in condensate line (with appropriate trap) to a place where the condensate will be noticeable. The owner of
the structure must be informed that when condensate flows from the secondary drain or external condensate
pan. the unit requires servicing or water damage will occur. Install traps in the condensate lines as close to the coil
as possible. Make sure that the outlet of each trap is below its connection to the condensate pan to prevent
condensate from overflowing the drain pan. Prime all traps, test for leaks, and insulate traps if located above a
living area. Condensate drain lines should be pitched downward at a minimum slope of I in. for every 10 ft of length.
Consult local codes for additional restrictions or precautions.
Braze with Sil-Fos or Phos-copper on copper to copper joints
and wrap a wet cloth around rear of fitting.
CAUTION
Shallow, running traps are inadequate and DO NOT allow
proper condensate drainage.
CAUTION
Page 11 of 20

Controller For Ducted Fan Coil Units
Features: The controller is used to control (DX/CW) cooled ducted split unit, supports the following functions:
- Modes: Cool, Dry, Fan, Heat | Indoor fan speed: Auto, High, Medium, Low
- Sleep mode, Programmable On/Off timer
- Compressor protections: Compressor 3 minutes restart protection, indoor coil anti-freeze, room sensor and indoor
coil sensor failure monitoring
- Random restart to minimize voltage dip during compressor first cut in cycle upon power up.
Hardware Setting:A 2 way DIP switch is used to configure:
Error Code: The corresponding error code will be shown one after another, in-case if multiple faults.
Split System Description
1) On/Off Key:If you press this key, the system will begin operation, Press the key again, and operation stops.
(You can hear a receiving beep). If you press this key immediately after turning off the system, the compressor will
not operate for 3 minutes to prevent overloading.
2) Operation Mode Selection Key:Toggles the operation mode: Cool, Dry, Heat, or Fan only
3) Fan Speed Selection Key:Toggles the fan speed: Auto, High, Medium, or Low, Note: Fan key is invalid in Dry
mode.
4) Temperature Up Key: By pressing Temp Up the setting temperature increases by 1ºC with each press.
5) Temperature Down Key: By pressing Temp Down the setting temperature decreases by 1ºC with each
press. If you set the desired room temperature, then system will maintain the room temperature as set. Upon
setting the desired room temperature the system will maintain the room temperature.
Cool Mode:If the room temperature is higher than the setting, the compressor will automatically turn on provide a
cooling effect. On the hand, if the room temperature is lower than the setting, the compressor will automatically turn
off to stop cooling operation. If indoor fan is programed to be turned off with compressor signal, it will turn off once
compressor is cut off.
Heat Mode:If the room temperature is lower than the setting, the electric heater will automatically turn on to
provide a heating effect. If the room temperature is higher than the setting, the heater will automatically turn off to
top heating operation. If indoor fan is programed to be turned off with heater signal, it will turn off once heater is cut
off but subject to 30 sec dispersing remaining heat timing.
DIP Switch
On
Off
SW1 Cool Cool-Heat
SW2
Water System
DX System
Error code
E1 E2 E4
Fault
Room sensor Indoor coil sensor Compressor
“COOL” Led
Lights on when selecting COOL mode.
“HEAT” Led
Lights on when selecting Heat mode.
“DRY” Led
Lights on when selecting DRY mode.
“FAN” Led
Lights on when selecting FAN mode.
“AUTO” Led
Lights on when selecting Auto fan speed.
“MED” Led
Lights on when selecting Med fan speed.
“HIGH” Led
Lights on when selecting High fan speed.
“LOW” Led
Lights on when selecting Low fan speed.
Wired Room
Controller (Standard)
Notes: The wired room controller is mounted on the wall and can control all system functions without wireless remote control.
Fig - System Room Controllers
Fig – Split System Setup
Page 12 of 20

Dry Mode: The fan speed runs automatically at low speed and compressor stopping and running is controlled by
the difference between room and setting temperatures and by continuous running time. If indoor fan is programed
to be turned off with comp signal, it will turn off once comp is cut off, In Dry mode, the humidity is reduced in the
space to be air-conditioned.
Fan Mode: There will be no cooling or heating effects; only the fans of indoor unit will run for ventilation at the
selected speed (High, Med, and Low).
-In COOL or HEAT mode and if AUTO fan speed is selected; Fan speed is automatically selected by controller
according to the difference between setting temperature and room temperature, fan will be continuously
running at low speed after setting temperature is achieved.
Notes:
a) Temperature setting range is 16ºC to 30ºC (60ºF to 85ºF), For ESMA regulated units the temperature
setting range is from 20°C to 30° or 68°C to 85°F. For optimum operation set the temperature between
21°C to 24°C (70 to 75°F)
b) Hold TEMP Down and fan keys at the same time for about 5 seconds, to toggle the
temperature setting from degree C to degree F and vice versa, temperature keys are invalid in Fan mode.
c) Press any temperature key will flash the current setting temperature for 4 seconds, with no further key
press; it will revert to room temperature display. Temperature display range is 0°C to 50°C (32°F to 99°F).
6) Sleep Key:Press SLEEP key to set the timer turning the sleep led will light on, to cancel the timer press
again, sleep function stop automatically the operation of the air conditioner after certain set off time.
- Sleep mode is valid in cool or heat mode and invalid in Fan mode.
7) Timer Key: Upon count down of the set hours, the system will switch from OFF to ON or vice-versa.
- OFF Timer Function to stop automatically, the air conditioner after certain set OFF time.
- ON Timer Function to start automatically, the air conditioner after certain set ON time.
* Timer setting is 1 Hour to 24 Hour. The timer led will light on when operating the Timer Function First key
press will flash the digital display and Timer Led for 3 seconds.
Notes:
a) The digital displays show the number of hours previously set, only the Timer Led flashes.
b) Subsequent 3 seconds will show the number of hours previously set; only the timer led flashes.
c) Should there be no further key press, it will revert to normal mode.
d) Should Timer key is not released timer setting will increase automatically every 0.5-second.
8) Sensor:Receives the remote controller’s signal
9) Display Screen:Displays the set temperature and displays also the TIMER settings when adjusting it.
10) Key Lock Mode:Hold down TEMP Down and MODE keys together for 3 seconds to activate
key lock mode – in that mode the light will come on for the KEY display , similarly to unlock.
In key lock mode, all keys are not valid except the below functions:
a) ON/OFF Key to turn ON/OFF the system.
b) Hold down TEMP Down and SLEEP button for 1 second to enter into coil temp
display mode. Press Temp Up key to display indoor coil temp, High Fan LED flashes; with the
same sequence to exit coil temp display mode. Temperature display range is –9C to 78C.
c) Hold down TEMP Down and Fan buttons together for 1 second to activate the system
control parameter setting – AUTO (FAN) Led will flash continuously, Press MODE button to
select the desire menu as following table. Press TEMP key Up or Down to change the
setting to 1 or 2 for following functions:
Led Flash
Functions
Default Value
Set Range
Description
Auto Fan Temperature Display 1 1 or 2 1: Disable room temp. display
2: Enable room temp. display
Auto & High Fan Cool Mode Fan Control 1 1 or 2 1: Compressor OFF, Fan ON
2: Compressor OFF, Fan OFF
Auto & Med Fan Heat Mode Fan Control 1 1 or 2 1: Heater OFF, Fan ON
2: Heater OFF, Fan OFF
Page 13 of 20

ECM Motor Troubleshooting
Fig – 12 Drip Loop
If the motor is running: but the system is noisy, shutting down on its limits or safeties or the evaporator coil is
freezing, there is a good chance the motor is good. The problem is most likely external to the motor.
•Check the tap selections using the HVAC OEM guide
•Check the air distribution system components for dirt load and closed dampers, registers and grilles.
•Measure the total external static pressure. Make repair(s) if above the HVAC OEM recommended
maximum level and confirm airflow at the new total ESP with the performance charts.
If the motor is not running: The following checks will diagnose whether it is operational. There are two inputs
needed to operate this motor, a high voltage constant power source, and the low voltage communication that
selects the torque value in each tap per demand.
Checking the high voltage input: First check the high voltage to terminals (L) and (N). There should be 230VAC
there is power to the system, regardless of a demand call. Applying incorrect high voltage to the X13 motor may
cause
the motor to not operate, or even damage the motor. If this voltage is missing, fix the problem in the system and try
to run the motor. If the voltage is within ± 10% of these ratings then move on to the next step. If the voltage is
above or below the ± 10% of these ratings, fix the voltage problem first, and try to run the motor. Proper grounding
should
always be checked and repaired if needed.
Fig – 13 High Voltage checking schematic Fig – 14 Low Voltage checking schematic
Checking the low voltage communication input: The following information must be known before
troubleshooting the low voltage communication to this motor.
•Which tap(s) have been programmed and what are their purposes (heating airflow, cooling airflow,
constant fan airflow).
•Where on the manufacturerʼs controls or circuit board the low voltage communication comes from by
demand
It is recommended that the electrical connections on the ECM be facing down or between the 4 and 8 oclock
position, and a drip loop formed out of the wiring harness leaving the motor
CAUTION
Page 14 of 20

•The sequence of operation of the manufacturerʼs controls or circuit board (when the low voltage
communication is sent to the motor from each thermostat demand and if there are any delays).
If no low voltage communication (typically 24vac) is measured at the motor on taps 1- 3, check the HVAC system
wiring, controls and demand call. Always check low voltage between terminals 1-3 and (C) at the motor, never
ground.
Once the problem is corrected, confirm that the low voltage communication is applied to a programmed tap. If
proper low voltage communication is present at a programmed tap, with proper high voltage to the motor and it still
does not operate, the motor is failed.
Repair: The X13 motor is programmed specifically for each HVAC OEM model and size unit it is used in. The
replacement motor must be an exact match to the system it was removed from including the voltage. There are no
universal replacement motors. Using the wrong motor voids all product warranties and may produce unexpected
results. Always follow all instructions included with the replacement motor.
Start-Up
Refer to outdoor unit installation instruction for system start-up instructions and refrigerant charging method details.
Application and Accessories
Model FB4P are designed for flexibility and can be used for upflow, horizontal and downflow (kit required)
applications.
Factory authorized electric heater packages are available, see product data literature for available accessory kits.
Heater packages: All units are not equipped with electric heater package. A factory approved, field installed UL
listed heater package is available from your equipment supplier. See unit rating plate for a list of factory approved
heaters. Heaters that are not factory approved could cause damage which would not be covered under the
equipment warranty.
Care and Maintenance
To continue high performance and minimize possible equipment failure, it is essential that periodic maintenance be
performed on this equipment consult your local dealer as to the proper frequency of maintenance and the
availability of a maintenance contract.
To Clean Coil
1. Be sure electrical service switch is open, locked, and tagged while working on unit.
2. Coil can be cleaned by removing filter and bottom panel and brush between coil fins with stiff wire brush.
Follow-up by cleaning with vacuum cleaner. If coil is cleaned with air hose and nozzle, take care not to
drive dirt and dust into other components.
Never operate unit without a filter. Damage to blower or coil may result. Factory authorized filter kits must be
used when locating the filter inside the unit. For those applications where access to an internal filter is
impractical, field-supplied filter must be installed in the return duct system.
CAUTION
Before installing or servicing a unit, always turn off all power to unit. There may be more than 1 disconnect
switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury or death.
CAUTION
Failure to follow this caution may result in equipment damage.
Motors are permanently lubricated; please do not use any external lubricant (such as WD40)
WARNING
Page 15 of 20

Check Drain
Lock open and tag unit electrical service switch. Check drain pan, drain line and trap at start of each cooling
season. A standard type pipe cleaner for 3/4-in. ID pipe can be used to ensure that pipe is clear of obstruction so
that condensate is carried away.
Clean Fan Wheel
Lock open and tag unit electrical service switch. For access to fan assembly, remove supply air duct and bottom
panel. Use a stiff brush or vacuum to remove dirt and debris from scroll. Wipe all fan surfaces with a damp cloth.
Clean or Replace Air Filters
Lock open and tag unit electrical service switch. At the start of each cooling season and after each month of
operation (more or less depending on operating conditions) replace throwaway filter or clean permanent filter.
Throwaway Filter: Replace filter with a good quality filter of the size shown in “Physical Data”. Do not attempt to
clean and reuse disposable filters.
Permanent Filter: Tap on solid surface to dislodge heavy particles. Wash in hot water. Set filter on end so that
water drains out through slots in frame. Allow filter to dry thoroughly.
Typical Wiring Schematic
Wiring Diagram: FCU FB ECM Motor Cool and Electric Heater
Application: 50Hz (18 - 60)
Page 16 of 20

ATTENTION INSTALLERS AND SERVICE TECHNICIANS!
R-410A Refrigerant Quick Reference Guide
•R-410A refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment
and replacement components are designed to operate with R-410A refrigerant.
•R-410A refrigerant cylinders are rose colored.
•Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
•R-410A refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering
device in the manifold hose when charging into suction line with compressor operating.
•Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low-side retard.
•Use hoses with 700 psig service pressure rating.
•Leak detectors should be designed to detect HFC refrigerant.
•R-410A refrigerant, as with other HFCs, is only compatible with POE oils.
•Vacuum pumps will not remove moisture from oil.
•Do not use liquid-line filter driers with rated working pressures less than 600 psig.
•Do not leave R-410A refrigerant suction line filter driers in line longer than 72 hours.
•Do not install a suction-line filter drier in liquid-line.
•POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
•POE oils may cause damage to certain plastics and roofing materials.
•Wrap all filter driers and service valves with wet cloth when brazing.
•A factory-approved liquid-line filter drier is required on every unit.
•Do NOT use an R-22 expansion device.
•If indoor unit is equipped with an R-22 expansion device, it must be changed to a hard-shutoff R-410A
refrigerant expansion device.
•Never open system to atmosphere while it is under a vacuum.
•When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry
nitrogen and replace filter driers. Evacuate to 500 microns prior to recharging.
•All indoor coils must be installed with a hard-shutoff R-410A refrigerant expansion metering device.
•Do not vent R-410A refrigerant into the atmosphere.
•Do not use capillary tube coils.
•Observe all warnings, cautions, and bold text.
Page 17 of 20

NO COOLING OR
INSUFFICIENT
COOLING
COMPRESSOR
WILL NOT RUN
CONTACTOR
OPEN
POWER SUPPLY
DEFECTIVE
LOW-VOLTAGE
TRANSFORMER
OPEN
THERMOSTAT
OPEN CONTROL
CIRCUIT
LOSS OF
CHARGE
CONTACTOR OR
COIL DEFECTIVE
LOOSE
ELECTRICAL
CONNECTION
CONTACTOR
CLOSED
COMPRESSOR
POWER SUPPLY
OPEN
LOOSE LEADS AT
COMPRESSOR
FAULTY START
GEAR (1-PH)
OPEN SHORTED
OR GROUNDED
COMPRESSOR
MOTOR
WINDINGS
COMPRESSOR
STUCK
COMPRESSOR
INTERNAL
PROTECTION
OPEN
DEFECTIVE RUN
CAPACITOR
OUTDOOR FAN
STOPPED OR
CYCLING ON
OVERLOAD
OUTDOOR AIR
RESTRICTED OR
RECIRCULATING
RESTRICTED
DISCHARGE
TUBE
OVERCHARGE
OR NON-
CONDENSABLES
IN SYSTEM
LOW
REFRIGERANT
CHARGE
LINE VOLTAGE
TOO HIGH OR
LOW
DEFECTIVE RUN
CAPACITOR
COMPRESSOR
BEARINGS
HIGH
SUPERHEAT
LOOSE LEAD
AT FAN MOTOR
MOTOR
DEFECTIVE
LOW SUCTION
PRESSURE
DIRTY AIR
FILTERS
DUCT
RESTRICTED
DAMPERS
PARTLY CLOSED
COMPRESSOR
RUNS BUT
CYCLES ON
INTERNAL
OVERLOAD
COMPRESSOR
RUNS BUT
INSUFFICIENT
COOLING
INCORRECT
OFM
CAPACITOR
INDOOR COIL
FROSTED
SLIGHTLY
LOW ON
REFRIGERANT
LIQUID LINE
SLIGHTLY
RESTRICTED
PISTON
RESTRICTED
INCORRECT
SIZE
PISTON
INDOOR COIL
STRAINER
RESTRICTED
INDOOR
BLOWER MOTOR
DEFECTIVE OR
CYCLING ON OL
HIGH SUCTION
LOW HEAD
PRESSURE
DEFECTIVE
COMPRESSOR
VALVES
INTERNAL
PRESSURE
RELIEF OPEN
HIGH SUCTION
LOW
SUPERHEAT
UNIT
OVERCHARGED
INCORRECT
SIZE
PISTON
Air Conditioner Troubleshooting Chart
Page 18 of 20

MANDATORY START-UP CHECK LIST AND RECORD
Yes No NA
Yes No NA
Indoor Entering Air dB(Dry Bulb) Temp
Indoor Leaving Air dB(Dry Bulb) Temp
Indoor Entering Air wB(Wet Bulb) Temp
Indoor Leaving Air wB(Wet Bulb) Temp
Fan System
Does the power supply match the fan coil unit data plate?
Is ground wire connected?
Are air filters in place and clean?
Technician Name, Signature and Date:
Leaving Outdoor Air Temp
Unit Amps(L1/L2/L3)
Vapor Line Pressure
Vapor Line Temp
Voltage (L1/L2/L3)
Does fan rotate freely?
Startup Date:
Indoor Model Number:
Liquid Line Temp
Entering Outdoor Air Temp
Outdoor Unit
Select cooling mode and adjust set point, it must be below current room temperature then observe unit operation.
After atleast 15 minutes of running time, record all the information below:
Select fan mode, then initiate test sequence. Does the fan motor start at low speed , then shift to medium then to high?
Start System Operation at the Fan Coil Unit
Does compressor start (After Initial Time Delay) and Run?
Does outdoor fan run properly?
Fan Coil Unit
Start-Up Checklist
Indoor Power Supply
Check Indoor Fan Operation Under Ceiling Fan Coil Units
Outdoor Serial Number:
Are control power lines connected to there control power terminal block?
Are terminal snug in the housing?
Are fresh batteries installed in the fan coil remote controller?
Does remote controller backlight illuminate when the button is pressed?
Are control power lines and control cables routed separately (Not in the same conduit and not in same multi-conductor cable?
Are control wires connected to the same circuit as associated refrigerant lines?
Check to make sure the subbase mounting to wall is secure? ( Don’t apply excessive force to mounting screw)
Are the refrigerant connections properly connected and have been checked for leakages?
Controls
TEAR ALONG THE DOTTED LINE
Have all the refrigerant connections and piping joints checked for leaks and vacuum test conducted to 500 micron?
Pre-Start-Up Checklist
Is there any shipping damage?
Has the ground wire been properly connected?
Are the circuit protection matched with the unit size and installed properly?
Are the power wire guage matched with the unit size and installed properly?
Are both refrigerant lines flushed / cleaned, connected to service valve sets and properly tightend?
Outdoor Unit
Check power supply to see if it matches the unit data plate?
Are all the service valves open and backseated ?
Are the Stem Valves Installed and snug?
Check accurater device size is matched and installed in fan coil unit? (If Applicable)
IMPORTANT!
This page is a mandatory checklist & record – the check to be executed and data to be recorded for future reference incase of failure.
A copy of this checklist data has to be submitted to carrier representative. Completion of this checklist is a must for any field claim, no field support will be provided for
incomplete or blank checklists.
Is condensate line connected?
Is the condensate line free from obstacle and drains freely?
Will this damage prevent the unit start-up?
If the unit is damaged, Please specifiy where:
Preliminary Information
Piping
Indoor Fan Coil Unit Piping
Indoor Serial Number:
Technician Name:
Additional Accessories:
Customer Name/Address: Project Name:
Outdoor Model Number:
Page 19 of 20

Manufacturer reserves the rights to discontinue or change at any time, specifications or designs without notice and without incurring any obligations.
Supersedes Version: FB4P-50HZ-IOM09 Catalog Number: FB4P-50HZ-IOM10
Effective Date: 26-10-2020 Phase: 50Hz
Page 20 of 20