Carrier FZ4A User manual

FZ4A
Installation Instructions
FAN COIL UNITS
FOR R- 410A REFRIGERANT
SIZES 024 TO 061
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1........................
INTRODUCTION 1..................................
HEATER PACKAGES 2..............................
INSTALLATION 2...................................
Step 1 — Check Equipment 2.........................
Step 2 — Mount Unit 2..............................
Step3—AirDucts 4...............................
Step 4 — Electrical Connections 4.....................
Step 5 — Refrigerant Tubing Connection and Evacuation 6..
Step 6 — Refrigerant Flow- Control Device 7.............
Step 7 — Condensate Drains 7........................
Step 8 — Accessories 7..............................
Step 9 — Sequence of Operation 8.....................
START- UP PROCEDURES 9..........................
CARE AND MAINTENANCE 9........................
AIRFLOW PERFORMANCE TABLES 9.................
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.
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.
!WARNING
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
CAUTION
!
INTRODUCTION
FZ4A models are R- 410A Fan Coils designed for installation
flexibility. These units are designed to meet cabinet air leakage of
less than 2% at 0.5 inches W.C. and cabinet air leakage less than
1.4% at 0.5 inches W.C. when tested in accordance with ASHRAE
193 standard.
A TXV is used on FZ4ANP(024- 061). All FZ4A fan coils use a
multi- tap ECM motor for efficiency. These units have be designed
for upflow, downflow (kit required), and horizontal orientations,
including manufactured and mobile home applications.
These units require a field supplied air filter, and are designed
specifically for R- 410A refrigerant air conditioners and heat
pumps as shipped. These units are available for systems of 24,000
through 60,000 BTUh nominal cooling capacity. Factory-
authorized, field - installed electric heater packages are available in
sizes 5 through 30kW. See Product Data literature for all available
accessory kits.

2
HEATER PACKAGES
This unit may or may not be equipped with an electric heater
package. For units not equipped with factory- installed heat, 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. If fan coil contains a factory- installed
heater package, minimum circuit ampacity (MCA) and maximum
fuse/breaker may be different than units with a same size
field- installed accessory heater. The differences is not an error and
is due to calculation difference per UL guidelines.
INSTALLATION
Step 1 — Check Equipment
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.
Refer to Table 1. Install the fan coil with the accompanying kit to
ensure compliance with low leak requirements of less than 2%
cabinet leakage rate at 0.5 inches W.C. and 1.4% cabinet leakage
rate at 0.5 inches W.C. when tested in accordance with ASHRAE
193 standard.
NOTE: Units that require a kit to meet low leak requirements have
a gasket kit automatically included with shipment.
Table 1 – Gasket Kit Requirement
Unit Size Kit Needed?
024 Yes
036 Yes
048 No
060 No
061 No
Step 2 — 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 to be 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.
NOTE: Nuisance sweating may occur if the unit is installed in a
humid location with low airflow.
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- in (3 to 6 mm) thick fireproof resilient
gasket between duct, unit, and floor.
Side return is a field option on slope coil models. Cut opening per
dimensions. (See Fig. 1.) A field- supplied bottom closure is
required.
A COIL
UNITS
POWER ENTRY
OPTIONS
LOW VOLT
ENTRY
OPTIONS
FIELD MODIFIED
SIDE RETURN
LOCATION FOR
SLOPE COIL
UNITS ONLY
FIELD SUPPLIED
RETURN PLENUM
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
UNIT
018, 024
025 - 030
A
12" (305 mm)
17" (432 mm)
A
1.5" (38 mm)
2.5"
(64 mm)
19" (483 mm)
FIELD SUPPLIED
SUPPLY DUCT
UPFLOW/DOWNFLOW
SECONDARY DRAIN
UPFLOW/DOWNFLOW
PRIMARY DRAIN
036 19" (483 mm)
018 - 048 21" (533 mm) FRONT SERVICE
060 - 060 24" (610mm) CLEARANCE
A07565
Fig. 1 - Slope Coil Unit in Upflow Application
B. Downflow Installation
In this application, field conversion of the evaporator is required
using accessory downflow kit along with an accessory base kit.
Use fireproof resilient gasket, 1/8 to 1/4- in (3 to 6 mm) thick,
between duct, unit, and floor.
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or property
damage.
The conversion of the fan coil to downflow requires special
procedures for the condensate drains on both A- coil and slope
units. The vertical drains have an overflow hole between the
primary and secondary drain holes. This hole is plugged for all
applications except downflow, but must be used for downflow.
During the conversion process, remove the plastic cap
covering the vertical drains only and discard. Remove the plug
from the overflow hole and discard. At completion of the
downflow installation, caulk around the vertical pan fitting to
door joint to retain the low air leak performance of the unit.
CAUTION
!
NOTE: To convert units for downflow applications, refer to
Installation Instructions supplied with kit for proper installation.
For slope fan coils, use kit Part No. KFADC0201SLP. For A- coils,
use kit Part No. KFADC0401ACL. Use fireproof resilient gasket,
1/8 to 1/4- in (3 to 6 mm) thick, between duct, unit, and floor.
NOTE: Gasket kit number KFAHD0101SLP is also required for
all downflow applications to maintain low air leak/low sweat
performance.
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. (See
Fig. 2 and 3.) When suspending unit from ceiling, dimples in
casing indicate suitable location of screws for mounting metal
support straps. (See Fig. 2.)

3
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or property
damage.
For optimum condensate drainage performance in horizontal
installations, unit should be leveled along its length and width.
CAUTION
!
For horizontal applications having high return static and humid
return air, the Water Management Kit, KFAHC0125AAA, may
need to be used to assist in water management.
UNIT
FIELD
SUPPLIED
HANGING
STRAPS
LOW VOLT
ENTRY
OPTIONS
POWER
ENTRY OPTIONS
SECONDARY
DRAIN
018-048 21" (533 mm)
060-060 24" (610 mm)
FRONT SERVICE
CLEARANCE
(FULL FACE
OF UNIT)
SECONDARY
DRAIN
A-COIL
HORIZONTAL LEFT
PRIMARY
DRAIN
PRIMARY
DRAIN
1.75" (44 mm)
FILTER ACCESS
CLEARANCE
A07566
Fig. 2 - Slope Coil Unit in Horizontal Left Application
A
B
C
FA CT OR Y SHIPPED
HORIZONTAL LEFT
APPLICATION
AIR SEAL
ASSEMBLY
HORIZONTAL
DRAIN PAN
REFRIGERANT
CONNECTIONS
SECONDARY DRAIN
HORIZONTAL LEFT
PRIMARY DRAIN
HORIZONTAL LEFT
COI L
SUPPORT
RAIL
COIL
BRACKET
DRAIN PA N
SUPPORT
BRACKET
COIL
BRACKET
A00072
Fig. 3 - A- Coil in Horizontal Left Application
NOTE: Gasket kit number KFAHD0101SLP is required for
horizontal slope coil conversion to maintain low air leak/low sweat
performance.
1. Remove blower and coil access panel 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 pre-
viously removed.
6. Make sure the pan cap in the fitting door is properly seated
on the fitting door to retain the low air leak rating of the
unit.
7. Add gaskets from kit KFAHD per kit instructions.
8. 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.
COIL MOUNTING
SCREW BLOWER
ASSEMBLY
REFRIGERANT
CONNECTIONS
SECONDARY DRAIN
PRIMARY DRAIN
DRAINPAN
SLOPE COIL
SKI
COIL
SUPPORT
RAIL
A03001
Fig. 4 - Conversion for Horizontal Right Applications
Horizontal Right Conversion of Units With A- Coils
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.
4. Slide coil and pan assembly out of unit.
5. Remove horizontal drain pan support bracket from coil sup-
port rail on left side of unit and reinstall on coil support rail
on right side of unit. (See Fig. 6.)
COIL
SUPPORT
RAIL
COIL
BRACKET
DRAIN PAN
SUPPORT
BRACKET
COIL
SUPPORT
RAIL
COIL
BRACKET
HORIZONTAL
DRAIN PAN
PRIMARY DRAIN
HORIZONTAL RIGHT
SECONDARY DRAIN
HORIZONTAL RIGHT
REFRIGERANT
CONNECTIONS
AIR SEAL
ASSEMBLY
A
B
C
HORIZONTAL
RIGHT
APPLICATION
A00071
Fig. 5 - Conversion for Horizontal Right Applications
Using A- Coil
DRAIN PAN
DRAIN PAN
SUPPORT BRACKET
SUPPORT BRACKET
A07571
Fig. 6 - Drain Pan Support Bracket
6. Convert air- seal assembly for horizontal right.
a. Remove air- seal assembly from coil by removing 4
screws.(SeeFig.5.)

4
b. Remove air splitter (B) from coil seal assembly by remov-
ing 3 screws. (See Fig. 3- factory shipped inset.)
c. Remove filter plate (A) and install air splitter (B) in place
of filter plate.
d. Install filter plate (A) as shown in horizontal right applica-
tion.
e. Remove condensate troughs (C) and install on opposite
tube sheets.
f. Install hose onto plastic spout.
7. Install horizontal pan on right side of coil assembly.
8. Slide coil assembly into casing. Be sure coil bracket on each
corner 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 offsets is used
on right side of unit to secure horizontal pan.
10. Remove two oval fitting caps from the left side of the coil
door and fitting panel.
11. Remove insulation knockouts on right side of coil access
panel.
12. Remove 2 oval coil access panel plugs and reinstall into
holes on left side of coil access panel and fitting panel.
13. Install condensate pan fitting caps (from item 10) in the
right side of the coil door making sure that the cap snaps
and seats cleanly on the back side of the coil door. Make
sure no insulation interferes with seating of the cap.
14. Reinstall access fitting panels, aligning holes with tubing
connections and condensate pan connections. Be sure to re-
install metal clip between fitting panel and vertical condens-
ate pan.
Make sure liquid and suction tube grommets are in place to prevent
air leaks and cabinet sweating.
D. Manufactured and Mobile Home Housing Applications
1. Fan coil unit must be secured to the structure using field-
supplied hardware.
2. Allow a minimum of 24- in (610 mm) clearance from access
panels.
3. Recommended method of securing for typical applications:
a. If fan coil is away from wall, attach pipe strap to top of fan
coil using no. 10 self- tapping screws. Angle strap down
and away from back of fan coil, remove all slack, and fasten
to wall stud of structure using 5/16- in. lag screws. Typical
both sides of fan coil.
DOWN FLOW
BASE KIT (KFACB)
UNIT AGAINST WALL
.125" (3mm)
MOUNTING BRACKET
(TYPICAL BOTH SIDES)
SECURE FAN COIL TO STRUCTURE
UNIT AWAY FROM WALL
PIPE STRAP
(TYPICAL BOTH SIDES)
OR
SECURE UNIT TO FLOOR
ANGLE BRACKET OR PIPE STRAP
4” (102mm) MAX
4” (102mm) MAX
A07567
Fig. 7 - A- Coil
b. If fan coil is against wall, secure fan coil to wall stud using
1/8- in (3 mm) thick right- angle brackets. Attach brackets
to fan coilusing no.10 self- tapping screws and to wallstud
using 5/16- in. lag screws. (See Fig. 7.)
Step 3 — Air Ducts
Connect supply- air duct over the outside of 3/4- in (19 mm)
flanges provided on supply- air opening. Secure duct to flange,
using proper fasteners for type of duct used, and seal 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.
Units equipped with 20- 30kW electric heaters require a 1- in (25
mm) clearance to combustible materials for the first 36- in (914
mm) of supply duct.
Ductwork Acoustical Treatment
Metal duct systems that do not have a 90_elbow and 10- ft (3m) 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 181 for Class
1 air ducts.
Step 4 — Electrical Connections
FZ4A units from the factory protect the low voltage circuit with a 3
amp automotive type fuse in- line on the wire harness and Does Not
contain a circuit board. Motor speeds and time delay function are built
into the motor (see section E for clarification).
When a factory- approved accessory control package has been
installed, check all factory wiring per unit wiring diagram and inspect
factory wiring connections to be sure none were loosened in transit or
installation. If a different control package is required, see unit rating
plate.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
If a disconnect switch is to be mounted on unit, select a
location where drill or fastener will not contact electrical or
refrigerant components.
CAUTION
!
Before proceeding with electrical connections, make certain that
supply voltage, frequency, phase, and ampacity are as specified on the
unit rating plate. See unit wiring label for proper field high- and
low- voltage wiring. Make all electrical connections in accordance
with the NEC and any local codes or ordinances that may apply. Use
copper wire only.
The unit must have a separate branch electric circuit with a
field- supplied disconnect switch located within sight from, and readily
accessible from, the unit.
On units with a factory- installed disconnect with pull- out removed,
service and maintenance can be safely performed on only the load side
of the control package.

5
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
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.
!WARNING
A. Line Voltage Connections
If unit will contain accessory electric heater, remove and discard power
plug from fan coil and connect male plug from heater to female plug
from unit wiring harness. (See Electric Heater Installation Instructions.)
For units without electric heater:
1. Connect 208/230v power leads from field disconnect to yellow
and black stripped leads.
2. Connect ground wire to unit ground lug.
NOTE: Units installed without electric heat should have a
field- supplied sheet metal block- off plate covering the heater opening.
This will reduce air leakage and formation of exterior condensation.
B. 24- v Control System
Connection To Unit
Wire low voltage in accordance with wiring label on the blower. (See
Fig. 8 through 12.) Use no. 18 AWG color- coded, insulated (35_C
minimum) wire to make the low- voltage connections between the
thermostat, the unit, and the outdoor equipment. If the thermostat is
located more than 100- ft (30 m) from the unit (as measured along the
low- voltage wire), use no. 16 AWG color- coded, insulated (35_C
minimum) wire. All wiring must be NEC Class 1 and must be
separated from incoming power leads.
A160008
Fig. 8 - Wiring Layout Single- Stage Air Conditioning Unit
A160009
Fig. 9 - Wiring Layout Single- Stage Heat Pump Unit
A160010
Fig. 10 - Wiring Layout Two- Stage Air Conditioning Unit
A16011
Fig. 11 - Wiring Layout Two- Stage Heat Pump
R
E
W 2
R
C
THERMOSTAT FAN COIL
(CONTROL) HEAT PUMP
(CONTROL)
G
C
W 2
E
L
G
C
R
O
Y
ODTS
O
Y
W 3
W 2
A03088
Fig. 12 - Wiring Layout Heat Pump Unit
(Cooling and 2- Stage Heat for Manufactured Housing)
Refer to outdoor unit wiring instructions for any additional wiring
procedure recommendations.
Transformer Information
Transformer is factory- wired for 230v operation. For 208v
applications, disconnect the black wire from the 230v terminal on
transformer and connect it to the 208v terminal. (See Fig. 13.)

6
230
C
208
BRN
RED
YEL
BLK
SECONDARY
PRIMAR
Y
A05182
Fig. 13 - Transformer Connections
Heater Staging
If electric heat staging is required, a multi- stage heating room
thermostat is required. Consult your equipment supplier for a
suitable thermostat.
C. Manufactured Housing
In manufactured housing applications, the Code of Federal
Regulations, Title 24, Chapter XX, Part 3280.714 requires that
supplemental electric heat be locked out at outdoor temperatures
above 40_F(4_C), except for a heat pump defrost cycle. Refer to
Fig. 12 for typical low voltage wiring with outdoor thermostat.
D. Ground Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
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. If
conduit connection uses reducing washers, a separate ground
wire must be used.
!WARNING
NOTE: Use UL- listed 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.
E. Minimum CFM and Motor 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.
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
† electric heat airflow is same CFM as Tap 3, except 0 sec off delay
‡ high static applications, see airflow tables for max airflow
To change motor speeds disconnect the BLUE fan lead from motor
connector terminal #2 (factory default position) and move to
desiredspeed-tap;1,2,3,or5.
On single stage systems with dehum and two stage systems, use
blower speed taps 2 and 3 for straight match systems and blower
speed taps 1 and 2 for up- sized indoor systems..
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. 14 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.
1 2 3 4 5
Speed Taps may be located on motor,
or on plug close to motor.
A160016
Fig. 14 - Motor Speed Connection
Step 5 — Refrigerant Tubing Connection and
Evacuation
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.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
A brazing shield MUST be used when tubing sets are being
brazed to the unit connections to prevent damage to the unit
surface and condensate pan fitting caps.
CAUTION
!
Units have sweat suction and liquid tube connections. Make
suction tube connection first.
1. Cut tubing to correct length.
2. Insert tube into sweat connection on unit until it bottoms.
3. Braze connection using silver bearing or non- silver bearing
brazing materials. Do not use solder (materials which melt
below 800_F / 427_C). Consult local code requirements.
4. Evacuate coil and tubing system to 500 microns using deep
vacuum method.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
Wrap a wet cloth around rear of fitting to prevent damage to
piston assembly or TXV and factory- made joints.
CAUTION
!

7
Step 6 — Refrigerant Flow- Control Device
The FZ4ANP(024- 061) size units come equipped with a R- 410A
refrigerant TXV.
Always use outdoor units designed to match indoor fan coil
applications.
PRODUCT OPERATION HAZARD
Failure to follow this caution may result in improper product
operation.
If using a TXV in conjunction with a single- phase
reciprocating compressor, a compressor start capacitor and
relay are required. Consult outdoor unit pre- sale literature for
start assist kit part number.
CAUTION
!
Step 7 — Condensate Drains
To connect drains, the cap openings must be removed. Use a knife
to start the opening near the tab and using pliers, pull the tab to
remove the disk. Clean the edge of the opening if necessary and
install the condensate line. Finally caulk around the lines where
they exit the fitting to retain the low leak rating of the unit.
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
The conversion of the fan coil to downflow requires special
procedures for the condensate drains on both A- coil and
slope units. The vertical drains have an overflow hole
between the primary and secondary drain holes. This hole is
plugged for all applications except downflow, but must be
used for downflow. During the conversion process, remove
the plastic cap covering the vertical drains only and discard.
Remove the plug from the overflow hole and discard. At
completion of the downflow installation, caulk around the
vertical pan fitting to door joint to retain the low air leak
performance of the unit.
CAUTION
!
Units are equipped with primary and secondary 3/4- in. FPT drain
connections. For proper condensate line installations see Fig. 1, 2,
3, 4 and 5. To prevent property damage and achieve optimum
drainage performance, BOTH primary and secondary drain lines
should be installed and include properly- sized condensate traps.
(See Fig. 15 and 16.) Factory- approved condensate traps are
available. It is recommended that PVC fittings be used on the
plastic condensate pan. Finger- tighten plus 1- 1/2 turns. Do not
over-tighten. Use pipe dope.
2” MIN
(51 mm)
UNIT
2” MIN
(51 mm)
A03002
Fig. 15 - Recommended Condensate Trap
FILTER
ACCESS
PANEL
SECONDARY DRAIN WITH
APPROPRIATE TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED TRAP)
PRIMARY TRAP REQUIRED
(USE FACTORY KIT OR
FIELD-SUPPLIED TRAP OF
SUFFICIENT DEPTH.
STANDARD P-TRAPS ARE
NOT SUFFICIENT. SEE
FIGURE OF RECOMMENDED
CONDENSATE TRAP)
A03003
Fig. 16 - Condensate Trap and Unit
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or
property damage.
Shallow running traps are inadequate and DO NOT allow
proper condensate drainage. (See Fig. 17.)
CAUTION
!
DO NOT USE SHALLOW RUNNING TRAPS!
A03013
Fig. 17 - Insufficient Condensate Trap
NOTE: When connecting condensate drain lines, avoid blocking
filter access panel, thus preventing filter removal. After connection,
prime both primary and secondary condensate traps.
NOTE: If 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 use of a separate 3/4- in (19 mm) 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.
(See Fig. 16.) 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 1- in (25 mm)
for every 10- ft (3 m) of length. Consult local codes for additional
restrictions or precautions.
Step 8 — Accessories
Humidifier
Connect humidifier and humidistat to fan coil unit as shown in Fig.
18 and Fig. 19. The cooling lockout relay is optional.

8
Step 9 — Sequence of Operation
A. Continuous Fan
Thermostat closes R to G. G energizes fan relay on PCB which
completes circuit to indoor blower motor. When G is de- energized,
there is a 90- sec delay before relay opens.
B. Cooling Mode
Thermostat energizes R to G, R to Y, and R to O (heat pump only).
G energizes fan relay on PCB which completes circuit to indoor
blower motor. When G is de- energized, there is a 90- sec delay
before fan relay opens.
C. Heat Pump Heating with Auxiliary Electric Heat
Thermostat energizes R to G, R to Y, and R to W. G energizes fan
relay on PCB which completes circuit to indoor blower motor. W
energizes electric heat relay(s) which completes circuit to heater
element(s). When W is de- energized, electric heat relay(s) open,
turning off heater elements. When G is de- energized there is a
90- sec delay before fan relay opens.
D. Electric Heat or Emergency Heat Mode
Thermostat closes R to W. W energizes electric heat relay(s) which
completes circuit to heater element(s). Blower motor is energized
through normally closed contacts on fan relay. When W is
de- energized, electric heat relay(s) opens.
R
G
C
E
L
O
Y
THERMOSTAT
RR
C
O
Y
G
C
W
2
W
2
W
2
W
3
E
FAN COIL
(CONTROL) HEAT PUMP
(CONTROL)
RED
GRY
BRN
WHT
WHT
BLU
VIO
HUMIDISTAT
RELAY
FAN HUMIDIFIER
115V M
A95294
Fig. 18 - Wiring Layout of Humidifier to Heat Pump
R
G
W
Y
THERMOSTAT
R
G
W
2
W
3
E
C
FAN COIL
(CONTROL)
C
Y
AIR COND.
HUMIDISTAT
FAN HUMIDIFIER
115V
RED
GRY
WHT
WHT
BLU
VIO
BRN
M
A95295
Fig. 19 - Wiring Layout of Humidifier to Fan Coil
With Electric Heat
A160012
Fig. 20 - Wiring Layout DEHUM Option for Single- Stage
Air Conditioning Unit
NOTE: DEHUM can only be used if a lower tap is available
on the motor.

9
A160013
Fig. 21 - Wiring Layout DEHUM Option for Heat Pump Unit
START- UP PROCEDURES
Refer to outdoor unit Installation Instructions for system start- up
instructions and refrigerant charging method details.
UNIT COMPONENT HAZARD
Failure to follow this caution may result in product damage.
Never operate unit without a filter. Damage to blower motor
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, a
field- supplied filter must be installed in the return duct
system.
CAUTION
!
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 contract.
The ability to properly perform maintenance on this equipment
requires certain mechanical skills and tools. If you do not possess
these, contact your dealer for maintenance. The only consumer
service recommended or required is filter replacement or cleaning
on a monthly basis.
Table 2 – FZ4A Airflow Performance (CFM)
MODEL & SIZE BLOWER
SPEED 0.10 0.20 0.30 0.40 0.50 0.60
FZ4A 024
Tap 5 969 936 892 835 763 676
Tap 4 826 795 766 743 706 660
Tap 3 755 736 711 679 639 593
Tap 2 573 541 507 471 434 394
Tap 1 573 541 507 471 434 394
FZ4A 036
Tap 5 1301 1276 1245 1218 1176 1121
Tap 4 1227 1191 1169 1143 1105 1074
Tap 3 1209 1190 1166 1136 1100 1059
Tap 2 792 753 710 665 616 564
Tap 1 547 485 429 380 337 302
FZ4A 048
Tap 5 1743 1712 1679 1642 1610 1574
Tap 4 1669 1634 1599 1564 1531 1499
Tap 3 1496 1454 1415 1378 1344 1312
Tap 2 1112 1066 1021 978 937 897
Tap 1 822 764 702 634 562 485
FZ4A 060
Tap 5 1897 1867 1836 1808 1774 1736
Tap 4 1817 1785 1757 1724 1693 1655
Tap 3 1878 1848 1816 1782 1747 1711
Tap 2 1445 1403 1360 1316 1271 1225
Tap 1 1086 1026 963 895 822 746
FZ4A 061
Tap 5 2030 1995 1961 1927 1888 1842
Tap 4 1811 1775 1740 1703 1664 1613
Tap 3 1671 1666 1654 1634 1607 1573
Tap 2 1350 1332 1309 1280 1245 1206
Tap 1 1188 1063 949 846 753 670
NOTES:
1. Airflow based upon dry coil at 230v with factory- approved filter and electric heater (2 element heater sizes 024 through 036, 3 element
heater sizes 048 through 061). For FZ4A models, airflow at 208 volts is approximately the same as 230 volts because the multi- tap ECM
motor is a constant torque motor. The torque doesn’t drop off at the speeds the motor operates.
2. To avoid potential for condensate blowing out of drain pan prior to making drain trap:
Return static pressure must be less than 0.40 in. wc.
Horizontal applications of 048 - 061 sizes must have supply static greater than 0.20 in. wc.
3. Airflow above 400 cfm/ton on 048- 061 size could result in condensate blowing off coil or splashing out of drain pan.

10
Table 3 – FZ4A Air Delivery Performance Correction Component Pressure Drop (in. wc) at Indicated Airflow (Dry to Wet Coil)
UNIT SIZE
CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
024 0.034 0.049 0.063 0.076 0.089 -- -- -- -- -- -- -- -- -- -- --
036 -- -- -- -- -- 0.070 0.080 0.090 0.099 -- -- -- -- -- -- --
048 -- -- -- -- -- -- -- -- -- 0.063 0.070 0.076 0.083 0.090 -- --
060 -- -- -- -- -- -- -- -- -- -- -- 0.049 0.054 0.059 0.065 0.070
061 -- -- -- -- -- -- -- -- -- -- -- 0.027 0.031 0.035 0.039 0.043
Table 4 – Electric Heater Static Pressure Drop (in. wc)
FZ4A024 - 036 FZ4A048 - 060
HEATER
ELEMENTS kW
EXTERNAL STATIC
PRESSURE
CORRECTION
HEATER
ELEMENTS kW
EXTERNAL STATIC
PRESSURE
CORRECTION
0 0 +.02 0 0 +.04
13, 5 +.01 28, 10 +.02
28, 10 0 3 9, 15 0
39, 15 –.02 420 –.02
420 –.04 618, 24, 30 –.10
R- 410A QUICK REFERENCE GUIDE
SR- 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.
SR- 410A refrigerant cylinders are rose colored.
SRecovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
SR- 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
SManifold sets should be 700 psig high side and 180 psig low side with 550 psig low- side retard.
SUse hoses with 700 psig service pressure rating.
SLeak detectors should be designed to detect HFC refrigerant.
SR- 410A refrigerant, as with other HFCs, is only compatible with POE oils.
SVacuum pumps will not remove moisture from oil.
SDo not use liquid- line filter driers with rated working pressures less than 600 psig.
SDo not leave R- 410A refrigerant suction line filter driers in line longer than 72 hours.
SDo not install a suction- line filter drier in liquid line.
SPOE oils absorb moisture rapidly. Do not expose oil to atmosphere.
SPOE oils may cause damage to certain plastics and roofing materials.
SWrap all filter driers and service valves with wet cloth when brazing.
SA factory approved liquid- line filter drier is required on every unit.
SDo NOT use an R- 22 TXV.
SIf indoor unit is equipped with a R- 22 TXV or piston metering device, it must be changed to a hard- shutoff R- 410A refrigerant
TXV.
SNever open system to atmosphere while it is under a vacuum.
SWhen 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.
SDo not vent R- 410A refrigerant into the atmosphere.
SDo not use capillary tube coils.
SObserve all warnings,cautions,andbold text.
SAll indoor coils must be installed with a hard- shutoff R- 410A refrigerant TXV metering device.
Copyright 2018 CAC / BDP D7310 W. Morris St. DIndianapolis, IN 46231 Edition Date: 04/18
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: IM- FZ4ANP- 02
Replaces: IM- FZ4ANP- 01