Carrier FK4C, FK4CNF002, FK4CNB006, FK4CNF003, FK4CNF001 Installation And Start-up Instructions Manual

Installation and Start-Up Instructions

Direct Expansion
Fan Coil
001-006

FK4C

A95518

Fig. 1—Model FK4C

NOTE: Read entire instruction manual before starting installation.

This symbol → indicates a change from the last publication.

SAFETY CONSIDERATIONS

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, 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 the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and National Electrical Code
(NEC) for special requirements.

Recognize safety information. This is the safety-alert symbol
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 would result in minor personal injury or product and property damage.

Model FK4C Fan Coil units are designed for flexibility and can be used for upflow, horizontal, or downflow applications.
These units are available for application in systems of 18,000 through 60,000 Btuh nominal cooling capacities. (See Fig. 2 and 3.)

Factory-authorized, field-installed electric heater packages are available in 5 through 30 kw. See Product Data for available accessory kits.

WARNING: Before installing or servicing fan coil, 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.

. When you see this symbol on the unit and in instructions or manuals, be alert

INTRODUCTION

Form: IM-FK4C-04 Cancels: IM-FK4C-03 Printed in U.S.A. 10-97 Catalog No. 63FK-4C0

″ FPT

4

⁄

3

″ ID SWEAT

8

⁄

7

″ ID SWEAT,

4

⁄

3

″ ID SWEAT

003, 005, & 006

8

⁄

3

″

8

⁄

7

″

4

⁄

3

OPTIONAL FILED

11″

″

16

⁄

1

22

″

16

⁄

3

10

OUTLET AIR

1″

″

8

⁄

1

2

7

ALTERNATE

DIA KNOCKOUT

″

8

⁄

7

for service.

Series designation is the 14th position

of unit model number.

NOTE:



Allow 21 In. from front

NOTE:



FOR LOW VOLTAGE

COPNVERTED RIGHT

SIDE RETURN

OPENING

(SLOPE COIL

UNITS ONLY)

″, 

8

⁄

″, 2″ DIA

32

⁄

3

ALTERNATE

KNOCKOUTS FOR

1





19″

HIGH VOLTAGE 

POWER WIRING

OPPOSITE SIDE

INLET AIR

CONTROL WIRING

LIQUID LINE

CONNECTION

H

FOR 

UNITS

MODULAR

J

MAX.

will have a

″

2

⁄

1

1

two-piece

cabinet.

″

2

⁄

1

2

OPENING

″

16

⁄

13

19

RIGHT SIDE VIEW

A95535

INLET AIR

NOTE: Modular units 

″

4

⁄

1

1

″

16

⁄

11

″

4

⁄

1

1

A

SLOPE COILS

AND "A" COILS

RIGHT APPLICATIONS

DOWNFLOW OR HORIZ

E

″

2

⁄

1

9

ACCESS PANEL CONFIG FOR

SUCTION LINE 

CONNECTION

DOWNFLOW APPLICATIONS

Fig. 2—Dimensional Drawing

TOP VIEW

LIQUID:

CONDENSATE PAN CONNECTIONS:

UNIT CONNECTION SIZES

SUCTION: 001 & 002 -



DIA KNOCKOUTS

″

8

⁄

FOR LOW VOLTAGE

7

1″

CONTROL WIRING

″

8

⁄

7

1

″

8

⁄

3

″, 2″ DIA KNOCKOUTS

1

32

⁄

3

″, 1

8

⁄

FOR HIGH VOLTAGE POWER WIRING

7

DISCONNECT OR CIRCUIT

BREAKER LOCATION

B

C

″

16

⁄

″

15

16

⁄

1

15

LIQUID LINE 

CONNECTION

″

″

16

16

⁄

⁄

1

11

3

4

BLOWER, CONTROL, & ELECTRIC

HEATER ACCESS PANEL

COIL ACCESS PANEL

LIQUID LINE

CONNECTION

FITTING

PANEL

″

8

⁄

5

2

SUCTION LINE

″

4

⁄

3

10

″

16

⁄

3

CONNECTION

6

5″

″

16

⁄

7

10

SLOPE COIL DETAILS

CONNECTION LOCATIONS

SHOWN FOR UPFLOW 

OR HORIZ LEFT APPLICATIONS

FILTER ACCESS

PANEL

D

INLET AIR

OPENING

DETAILS CONNECTION LOCATIONS 

FRONT VIEW SHOWN WITH "A" COIL 

1″

FOR UPFLOW OR HORIZ APPLICATIONS

ABCDEFG

In. In. In. In. In. In. In.

001 47-5/8 17-5/8 15-3/4 15-5/8 15-3/8 23-1/8 23-5/8

002 42-11/16 17-5/8 15-3/4 15-5/8 10-3/4 18-9/16 18-1/4

003 53-7/16 21-1/8 19-1/4 19-1/8 19-3/16 26-15/16 27-1/2

UNIT SIZE

FK4C

005 53-7/16 21-1/8 19-1/4 19-1/8 19-1/2 27-1/4 26-15/16

006 59-3/16 24-11/16 22-3/4 22-11/16 25-1/4 32-15/16 32-5/8

—2—

⁄16″

3

2

TYP

(2 PLACES)*

PRIMARY DRAIN

SECONDARY DRAIN

″

16

⁄

TYP*

5

G

″

8

⁄

TYP*

″

8

⁄

TYP*

7

″

2

⁄

1

″

TYP*

16

⁄

11

1

″

16

⁄

5

HORIZ RIGHT

1

(FIELD CONVERTED)

2″

F

SECONDARY DRAIN

PRIMARY DRAIN

″

16

⁄

TYP*

5

7

″

2

⁄

1

TYP*

″

2

⁄

1

1

″

4

⁄

1

1

A95536

HORIZ RIGHT

(FIELD CONVERTED)

″

8

⁄

″

7

8

⁄

7

7

5

WEIGHT

OPERATING

SECONDARY DRAIN

G

″

16

″

16

⁄

13

TYP*

1

⁄

3

2

TYP

(2 PLACES)*

1″

TYP

(2 PLACES)*

″

16

⁄

13

TYP*

1

AIRFLOW

SLOPE COIL

″ 

16

⁄

TYP

7

AIRFLOW

″

4

⁄

1

3



(4 PLACES)*



1″

TYP

PRIMARY DRAIN

″

16

⁄

5

1

F

(2 PLACES)*

″

16

⁄

13

TYP*

1

SECONDARY DRAIN

PRIMARY DRAIN

SECONDARY DRAIN

″

16

/

7

TYP

″

8

PRIMARY DRAIN

⁄

7

2

SECONDARY DRAIN

5

″

16

⁄

3

TYP*

2

(2 PLCS)

″

16

⁄

″

16

⁄

3

1

5

″

⁄

7

2

1

(4 PLACES)*

1″

TYP

(2 PLACES)*

″

8

⁄
2

″

4

⁄

″

1

2

⁄

2

1

1

″

16

⁄

TYP*

11

1

8

5″

″

″

2

8

⁄

⁄

TYP*

7

AIRFLOW

DOWNFLOW

(FIELD CONVERTED)



″

16

⁄

TYP 

(4 PLACES)*

7



UPFLOW

(AS SHIPPED)

AIRFLOW

HORIZ LEFT

(AS SHIPPED)

TYP*



″

″

4

8

⁄

⁄

3

1

4

3

F

1″

TYP

(2 PLACES)*

″

16

⁄

PRIMARY DRAIN

13

TYP*

1

SECONDARY DRAIN

PRIMARY DRAIN

SECONDARY DRAIN

PRIMARY DRAIN

3

7

″

16

⁄

7

TYP

3″

″

16

⁄

11

2

″

16

⁄

TYP

(2 PLACES)*

2

″

16

⁄

5

TYP*

″

8

⁄
5

″

4

⁄

1

1

″

2

⁄

1

1

″

2

⁄

TYP*

1

(4 PLACES)*

″

4

⁄

″

3

8

⁄

4

1

3

″

8

⁄

7

7

DOWNFLOW

(FIELD CONVERTED)

A–COIL

UPFLOW

(AS SHIPPED)

HORIZ LEFT

(AS SHIPPED)

H J COIL CONFIGURATION

In. In. Slope "A" lb

001 — 17 Yes — 112

002 — — — Yes 120

003 — 19 Yes — 145

005 — — — Yes 162

UNIT SIZE

FK4C

Fig. 3—Dimensional Drawing

006 34-1/16 — — Yes 195

PANEL, AND BACK OF CABINET. IN CABINET BOTTOM, HOLES PROVIDED

.136 IN. DIA. HORIZONTAL HANGING HARDWARE TO BE FIELD

SUPPLIED.

* HORIZONTAL MOUNT LOCATIONS - DIMPLES PROVIDED IN TOP 

″

8

⁄

7

TYP*

—3—

INSTALLATION

PROCEDURE 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.

PROCEDURE 2—MOUNT FAN COIL

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/orlivingarea,building codes may require a field-supplied secondary condensate

pan to be installed under the entire unit. Some localities may allow as an alterative the running of a separate, secondary condensate line. Consult
local codes for additional restrictions or precautions.

When installing any fan coil over a finished ceiling and/or living area, installation of a secondary drain pan under entire unit to avoid damage to
ceiling is recommended.

FK4C Fan Coils can be installed for upflow and horizontal-left applications as factory shipped. Units can be installed for horizontal-right
applications with field modifications. Units may be converted for downflow applications using factory-authorized accessory kit.

NOTE: To ensure proper drainage for horizontal installations, unit must be installed so it is within 1/8 in. level of the length and width of unit.
A. Upflow Installation

If return air is to be ducted, install duct flush with floor. Set unit on floor over opening.
Only use return-air opening provided. All return air must pass through the coil. (See Fig. 4.)

B. Modular Units

The FK4C Fan Coil in size 006 is a 2-piece modular unit. Modular construction allows installer to disassemble unit into 2 components, coil box
and blower box, for ease of installation. (See Fig. 5.)

To disassemble unit, remove rear corner brackets by removing 2 screws which secure brackets. (See Fig. 5.) Remove either 2 screws in each front
corner of coil box, or 2 screws in blower box. Do not remove all 4 screws in each corner. (See Fig. 5.) Sections may now be separated by lifting
top section from lower section.

To reassemble, reverse above procedure. Be certain to reinstall all fasteners when reassembling.

C. Horizontal Installations

Be sure installation complies with all applicable building codes that may require installation of a secondary condensate pan.

1. Arrange support for unit by setting it in or above secondary condensate pan.

2. When suspending unit from ceiling, dimples in casing indicate proper location of screws for mounting metal support straps. (See Fig. 6.)

POWER ENTRY

OPTIONS

FIELD SUPPLIED
SUPPLY DUCT

LOW VOLT
ENTRY
OPTIONS

24-IN. FRONT SERVICE

A COIL

UNITS

UPFLOW/DOWNFLOW

SECONDARY DRAIN

UPFLOW/DOWNFLOW

PRIMARY DRAIN

UPFLOW/DOWNFLOW

SECONDARY DRAIN

UPFLOW/DOWNFLOW

PRIMARY DRAIN

CLEARANCE

Fig. 4—Slope Coil Unit in Upflow Application

1 1⁄2″

2 1⁄2″

19″

UNIT

001
003

A

FIELD SUPPLIED
RETURN PLENUM

A
17 In.
19 In.

FIELD MODIFIED
SIDE RETURN
LOCATION FOR
SLOPE COIL
UNITS ONLY

A95621

—4—

2 SCREWS

REAR CORNER
BRACKET

BLOWER BOX

2 SCREWS

COIL BOX

2 SCREWS

A95293

Fig. 5—Modular Unit Assembly

CAUTION: For optimum condensate drainage performance in horizontal installations, unit should be leveled along its
length or raised 1/4 in. at the air inlet. The unit should also be pitched forward 1/4 in. to 1/2 in. toward the front condensate
drains.

D. Horizontal-Right Conversion of Units with Slope Coils

To convert units for horizontal right installations:

1. Remove blower and coil access panels and fitting panel. (See Fig. 7.)

2. Remove screw securing coil assembly to right side casing flange.

3. Remove coil assembly.

4. Lay fan coil on its right side and reinstall coil assembly with condensate pan down. (See Fig. 7.)

5. Attach coil to casing flange using previously removed coil mounting screw.

6. Reinstall access panels and fitting panel, aligning holes with tubing connections and condensate pan connections.

Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating. Install grommets after brazing.

E. Horizontal Right Conversion of Units With A-Coil

To convert units for horizontal right installations:

1. Remove blower and coil access panels. (See Fig. 8.)

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 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. 8—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 troughs (C) and install on opposite tube sheets.
f. Install hose onto plastic spout.

7. Install horizontal pan on right side of coil assembly.

—5—

A-COIL
HORIZONTAL LEFT

LOW VOLT
ENTRY
OPTIONS

POWER
ENTRY OPTIONS

FIELD
SUPPLIED
HANGING
STRAPS

UNIT

PRIMARY

SECONDARY
DRAIN

DRAIN

Fig. 6—Slope Coil in Horizontal-Left Application

COIL MOUNTING
SCREW

SECONDARY
DRAIN

24-IN.
FRONT SERVICE
CLEARANCE
(FULL FACE
OF UNIT)

1 3/4 IN.
FILTER ACCESS
CLEARANCE

BLOWER
ASSEMBLY

PRIMARY
DRAIN

A95292

COIL

SUPPORT

RAIL

SLOPE COIL

SKI

DRAINPAN

Fig. 7—Slope Coil in Horizontal-Right Application

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 offset is used on right side of unit
to secure horizontal pan.

10. Remove 2 oval coil access panel plugs and reinstall into holes on left side of coil access panel and fitting panel.

11. Remove insulation knockouts 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.

REFRIGERANT
CONNECTIONS

—6—

PRIMARY DRAIN

OVERFLOW HOLE

SECONDARY DRAIN

A95288

A

AIR SEAL
ASSEMBLY

PRIMARY DRAIN
HORIZONTAL LEFT

SECONDARY DRAIN
HORIZONTAL LEFT

HORIZONTAL

RIGHT

APPLICATION

B
C

A

FACTORY SHIPPED

HORIZONTAL LEFT

APPLICATION

B

C

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

Fig. 8—A-Coil in Horizontal Right-Application

Make sure liquid and suction tube grommets are in place to prevent air leaks and cabinet sweating.

F. Downflow Installations

To convert units for downflow applications, refer to Installation Instructions supplied with kit for proper installation. For FK4C unit sizes 001 and
003, use kit Part No. KFADC0201SLP. For FK4C unit sizes 002, 005, and 006 use kit Part No. KFADC0401ACL. Use fireproof resilient gasket,
1/8- to 1/4-in. thick, between duct, unit, and floor.

PROCEDURE 3—AIR DUCTS

Connect supply-air duct over outside of 3/4-in. flange provided on supply-air opening. Secure duct to flange with proper fasteners for type of duct
used, and tape duct-to-unit joint.
Duct connection flanges are provided on unit air discharge connection.
When using FK4C units with 20-, 24-, and 30-kw electric heaters, maintain a 1-in. clearance from combustible materials to discharge plenum and
ductwork for a distance of 36 in. from unit. Use accessory downflow base to maintain proper clearance on downflow installations.
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 Standards 90A
or B as tested by UL Standard 181 for Class 1 air ducts.

PROCEDURE 4—ELECTRICAL CONNECTIONS

→

A. Line-Voltage Connections

Units with 15- and 20-kw heaters are factory wired for dual-circuit operation. When single-circuit operation is required, 24- and 30-kw heaters
are field convertible, and 15- and 20-kw fused heaters require the use of factory-authorized adapter kit.
Check all factory wiring per unit wiring diagram and inspect factory wiring connections to be sure none were loosened in transit or installation.

A95286

WARNING: Before installing or servicing system, always turn off all power to system. There may be more than 1

disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury or death.

CAUTION: 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. Electrical shock can cause personal injury or death.

NOTE: Before proceeding with electrical connections, make certain that supply voltage, frequency, and phase are as specified on unit rating plate.

Be sure that electrical service provided by the utility is sufficient to handle the additional load imposed by this equipment.
See unit wiring label for proper field high- and low-voltage wiring. Make all electrical connections in accordance with 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.

—7—

Thermostat

Subbase

FK4C

Terminal

Block

W

2

Outdoor

Terminal

Board

Thermostat

Subbase

FK4C

Terminal

Block

W

2

CCC

W

/

W1

W

1

Outdoor

Terminal

Board

W

2

CCC

W

/

W1

L

GG

Y

/

Y2

O

/W

2

RRR

W

1

Y

/

Y2

OO

W

2

G

Y

A95313

Fig. 9—Single-Speed Heat Pump Wiring

All units are shipped with power plug and stripped leads for connection of field wiring to units without electric heat.

→

L

GGG

Y

/

Y2

Y

1

/

W

2

O

/W

2

RRR

Y

/

Y2

Y

1

OO

Fig. 10—Two-Speed Heat Pump Wiring

1. Connect 208/230v power leads from field disconnect to yellow and black-striped leads.

2. Connect ground wire to unit ground lug.

3. If unit contains 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.)

B. 24-V Control System Connections to Unit Printed-Circuit Board (PCB)

Refer to unit wiring instructions for recommended wiring procedures. Use No. 18 AWG color-coded, insulated (35°C minimum) wires to make
low-voltage connections between thermostat and unit. If thermostat is located more than 100 ft from unit (as measured along the low-voltage
wires), use No. 16 AWG color-coded, insulated (35°C minimum) wires. PCB is circuited for single-stage heater operation. When additional heater
staging is desired using 2-stage or outdoor thermostats, see applicable outdoor unit instructions. Remove Jumper J2 on PCB.

1. The 5-, 8-, and 10-kw heaters are single stage only.

2. The 15- and 20-kw heaters are adaptable for 2-stage operation.

3. The 24- and 30-kw heaters are adaptable for up to 3-stage operation.

Connect low-voltage leads to thermostat and outdoor unit. (See Fig. 9 and 10.)

C. Intelligent Heat Option

→

Intelligent Heat staging of the electric heat package is possible when the FK4C is installed as a part of a single-speed heat pump system using a
corporate 2-speed programmable thermostat (model TSTATXXP2S01-A) and any 1 of the following electric heat packages:
KFAEH2501N09, KFAEH2601F15, KFAEH2801C15, KFAEH2701S15, KFAEH1001F24 or KFAEH1101F30.

To activate Intelligent Heat:

1. Set thermostat dip switch C to off and D to on.

2. On the fan coil Easy Select board, remove Jumper J2 (W1-W2).

3. Complete system low-voltage wiring as shown in Fig. 11.

NOTE: Where local codes require thermostat wiring be routed through conduit or raceways, splices can be made inside the fan coil unit. All
wiring must be NEC Class l and must be separated from incoming power leads.

A factory-authorized disconnect kit is available for installation of 0- through 10-kw applications. When electric heat packages with circuit breakers
are installed, the circuit breaker can be used as a disconnect.

Y

2

Y

1

E

A95314

—8—

MODEL 2S

THERMOSTAT

FK4

FAN COIL

SINGLE-SPEED

24 VAC HOT




FAN




HEAT STAGE 2




COOL/HEAT 

STAGE 1



RVS COOLING




HEAT STAGE 3

24 VAC COMM.




RVS HEATING




TROUBLE




OUTDOOR



SENSOR



CONNECTION

R

G

W/W1

Y/Y2

O/W2

Y1/W2

C
B

L

S1

S2

R
G

W1

Y/Y2

O

W2

Y1

C
E
L

R

Y

O

W2

C

Fig. 11—Single Speed Heat Pump Wiring with Intelligent Heat

SECONDARY

A96063

BRN

RED

C

208

230

YEL
BLK

PRIMARY

A94067

Fig. 12—Transformer Connections

Transformer is factory wired for 230-v operation. For 208-v applications, disconnect black wire from 230-v terminal on transformer and connect
it to 208-v terminal. (See Fig. 12.)

The secondary circuit of transformer is protected by a 5-amp fuse mounted on printed-circuit board.

IMPORTANT: Do not use outdoor thermostat with Intelligent Heat.
D. Ground Connections

Use UL listed conduit and conduit connector to connect supply wire(s) to unit and obtain proper grounding. Grounding may also be accomplished
by using grounding lug provided in control box. Use of dual or multiple supply circuits will require grounding of each circuit to ground lugs
provided on unit and heaters.

WARNING: The cabinet must have an uninterrupted or unbroken ground according to NEC, ANSI/NFPA 70 and local
codes 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 an electrical
shock, fire, or death.

PROCEDURE 5—FK4C FAN COIL SEQUENCE OF OPERATION

→

The FK4C will supply airflow in a range which is more than twice the range of a standard fan coil. It is designed to provide nominal cooling
capacities at a 50°F evaporator temperature and the required airflow which enables it to match with 4 air conditioner or heat pump system sizes.
Table 1 outlines the CFM range for the different FK4C Fan Coil sizes.

—9—

Table 1–CFM Range for FK4C Units

FAN COIL SIZE SYSTEM SIZES CFM RANGE

FK4CNF001 018, 024, 030, 036 450-1275
FK4CNF002 018, 024, 030, 036 450-1275
FK4CNF003 024, 030, 036, 042 525-1475
FK4CNF005 030, 036, 042, 048 550-1700
FK4CNB006 036, 042, 048, 060 550-2150

A. Continuous Fan

1. Thermostat closes circuit R to G
The blower runs at continuous fan airflow.

B. Cooling Mode — Single speed or 2-speed high

1. Thermostat closes circuits R to G, R to Y/Y2 and R to O
The fan coil delivers single speed cooling airflow.

2. Thermostat closes circuits R to G, R to Y1, R to Y2 and R to O
The fan coil delivers 2-speed high cooling airflow.

C. Cooling Mode — 2-speed low

1. Thermostat closes circuits R to G, R to Y1 and R to O
The fan coil delivers 2-speed low cooling airflow.

→

D. Cooling Mode — Dehumidification

1. Thermostat or thermidistat closes circuits R to G, R to O, and R to Y/Y2 (or Y to Y1 for 2-speed low), and humidistat or thermidistat opens
RtoDH
The fan coil delivers airflow which is approximately 80 percent of the nominal cooling airflow to increase the latent capacity of the system.

→

E. Cooling Mode — Super Dehumidify Operation
NOTE: The indoor control used, such as a thermidistat, must be capable of providing Super Dehumidify operation mode and control must be

configured as outlined in its installation instructions. Consult indoor control literature to determine if control is capable and for configuration
instructions.

1. Thermidistat closes circuit R to O, opens circuit R to DH, and cycles circuits R to G and R to Y/Y2 on and off
The fan coil delivers airflow which maximizes latent heat removal of system when operated for dehumidification at temperatures below the
indoor temperature setpoint. (See indoor control literature for details.)

F. Electric Heat Heating Mode

1. Thermostat closes circuit R to W/W1, or W2
The fan coil delivers the selected electric heat airflow.

G. Heat Pump Heating Mode — Single speed or 2-Speed High

1. Thermostat closes circuits R to G and R to Y/Y2
The fan coil delivers single speed heat pump heating airflow.

2. Thermostat closes circuits R to G, R to Y1 and R to Y/Y2
The fan coil delivers 2-speed high heat pump heating airflow.

H. Heat Pump Heating Mode — 2-speed low

1. Thermostat closes circuits R to G and R to Y1
The fan coil delivers 2-speed heat pump heating low airflow.

I. Heat Pump Heating with Auxiliary Electric Heat

1. Thermostat closes circuits R to G, R to Y/Y2 and/or R to Y1 with R to W/W1 or W2 (and R to O in the case of defrost)

In the event that electric heating is called for by the thermostat while the heat pump is also operating in either heating or defrost modes, the motor
will modify its airflow output, if necessary, to provide an airflow which is defined as safe for the operation of the electric heater during heat pump
operation. That airflow is the greater of the heat pump heating airflow and the greater of the electric heater only airflow.

PROCEDURE 6—CONNECT REFRIGERANT TUBING

See Dimensional Drawing for tube connection sizes, type, and locations. Use accessory tubing package or field-supplied tubing of refrigerant
grade. Insulate entire suction tube if field-supplied tubing is used. Tubing package has an insulated suction tube. Do not use damaged, dirty, or
contaminated tubing because it may plug refrigerant flow control device. When tubing package is used and sweat connections are made within
60 sec, coil and tubing system does not require evacuation. Always evacuate if field-supplied tubing is used.

CAUTION: A brazing shield MUST be used when tubing sets are being brazed to the unit connections to prevent

damage to the unit surface.

CAUTION: To prevent damage to thermostatic expansion valve, remove sensor bulb from vapor tube while brazing or

soldering vapor connections.

—10—

UNIT

2 1⁄4″

2 1⁄4″

DO NOT USE SHALLOW RUNNING TRAPS!

A95321

Fig. 13—Recommended Condensate Trap

Fig. 14—Insufficient Condensate Trap

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. Solder with low-temperature 430°F silver alloy solder.

CAUTION: Wrap a wet cloth around rear of fitting to prevent damage to factory-made joints.

4. Evacuate coil and tubing system if connections are not made within 60 sec or tubing package is not used.

PROCEDURE 7—CONDENSATE DRAIN

→

Units are equipped with primary and secondary 3/4-in. FPT drain connections. For proper condensate line installation see Fig. 4, 6, 7, and 8. 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. 13 and 15.) (Units starting with serial number 1398 are shipped with PVC primary condensate trap.
Check loose parts bag.) Be sure to install plastic push-in plugs in unused condensate drain fittings. It is recommended that PVC fittings be used
on the plastic condensate pan. Do not over-tighten. Finger-tighten plus 1-1/2 turns. Use pipe dope.

CAUTION: Shallow running taps are inadequate and DO NOT allow proper condensate drainage. (See Fig. 14.)

NOTE: When connecting condensate drain lines, avoid blocking filter access panel. Prime both primary and secondary condensate traps after

connecting to drain pan.
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 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 pane, the unit requires
servicing, or water damage will occur.

Install traps in the condensate lines as close to the coil as possible. (See Fig. 15.) 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 are.

Condensate drain lines should be pitched downward at a minimum of 1 in. for every 10 ft. of length. Consult local codes for additional restrictions
or precautions.

A95320

CAUTION: Never operate unit without a filter or with filter access door removed. Damage to blower motor or coil can

result.

IMPORTANT: Factory authorized filters must be used when locating the filter inside the unit. (See Table 2.) For those applications where access

to an internal filter is impractical, a field-supplied filter must be installed in the return duct system.

FILTER KIT

(12 PACK)

Table 2—Filter Kits

PART NUMBER SIZE USED WITH

KFAFK0212MED 001, 002,

KFAFK0312LRG 003, 005

KFAFK0412XXL 006

—11—

FILTER
ACCESS
PANEL

SECONDARY DRAIN
(FIELD-SUPPLIED
TRAP REQUIRED)

PRIMARY TRAP

(FACTORY-SUPPLIED

ON SOME UNITS)

A97560

Fig. 15—Condensate Trap and Unit

PROCEDURE 8—UNIT START-UP

Refer to outdoor unit Installation Instructions for system start-up instructions and refrigerant charging method details.

PROCEDURE 9—EASY SELECT CONFIGURATION TAPS

EASY SELECT taps are used by the installer to configure a system. ICM2 uses the selected taps to modify its operation to a pre-programmed table
of airflows. Airflows are based on system size or mode of operation and those airflows are modified in response to other inputs such as the need
for de-humidification. (See Fig. 16 and 17.)

The FK4C Fan Coil 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 label located next to select pins), move the 6 select wires to the pins which match the components
used.

A. AUX HEAT KW/CFM – Select heater range for size of electric heater installed

Installer must select the auxiliary heat airflow approved for application with kw size heater installed. If no heater is installed, this step can be
skipped. Each select pin is marked with a range of heaters for which airflow, also marked, is approved. The heater installed must fall within the
range selected 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 the primary heating source. In heat pump heating mode when electric heaters are energized,
the ICM2 will run the higher of heat pump heating airflow and electric heater airflow to ensure safe heater operation. The factory selection is the
largest heater range approved. (See Fig. 16, A as indicated.)

B. AC/HP SIZE – Select system size installed

The factory setting for air conditioner or heat pump size is the largest unit meant for application with the model of fan coil purchased. Installer
needs to select air conditioner or heat pump size to ensure that airflow delivered falls within proper range for the size unit installed. This applies
to all operational modes with the exception of electric heat modes. (See Fig. 16, B as indicated.)

C. SYSTEM TYPE – Select system type installed AC or HP

The type of system must be selected:

1. AC — Air conditioner

2. HP-COMFORT — Provides approximately 315 CFM per ton for higher normal heating air delivery temperature. Provides approximately
350 CFM per ton cooling airflow for good humidity removal.

3. HP-EFF — Provides same airflow for heating and cooling modes; approximately 350 CFM per ton.

The factory setting is AC. (See Fig. 16, C as indicated.)

D. AC/HP CFM ADJUST – Select Medium, Low, or High airflow

To provide airflow at rates described above, the AC/HP ADJUST select is factory set to the nominal (nom) tap. The adjust selections HI/LO will
regulate airflow supplied for all operational modes, except non-heat pump heating modes, +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. (See Fig. 16, D as indicated.)

E. ON/OFF DELAY – Select desired time delay profile

Four motor operation delay profiles are provided to customize and enhance system operation. (See Fig. 16, E as indicated)
Selection options are:

1. The standard 90 sec off delay (Factory setting).

2. No delay option used for servicing unit or when a thermostat is utilized to perform delay functions.

—12—

LOW VOLTAGE TERMINAL BLOCK

PRINTED CIRCUIT BOARD

SEC1 SEC2

EASY SELECT

AUX HEAT KW/CFM

0-30

0-20

1075

A

B

C

D

E

F

VIO

BLU

ORN

BLK

WHT

YEL

875

AC/HP SIZE

036 030 024 018

SYSTEM TYPE

AC

AC/HP CFM ADJUST

NOM HI

ON/OFF DELAY

09030900

CONTINUOUS FAN

MED HI YELLO

CEBD430226-01B CESS430226-01B

TM

0-10
725

HP-COMFORT

HP-EFF

LO

0

HEATER/MOTOR

ENH

0-5
625

J1

J2

AUX1 HUM1

AUX2

HUM2

24VAC

GRY

D

W
W

Y

Y/Y

H

R

1

2

1

2

G
O
C

MOLEX 12-PIN CONNECTOR

A95275

Fig. 16—Detail of FK4C Printed-Circuit Board

3. A 30 sec on (delay with no airflow)/ 90 sec off (delay at 100 percent airflow) profile is used when it is desirable to allow system coils time
to heat-up/cool-down in conjunction with the airflow. (This profile will minimize cold blow in heat pump operation and could enhance
system efficiency.)

4. ENH,enhanced selection, provides a 30 sec on (delay with no airflow)/ 180 sec off (delay at half airflow) add comfort and efficiency results.

F. CONTINUOUS FAN — Select desired fan speed when thermostat is set on continuous fan

1. LO speed — factory setting, 50 percent cooling mode airflow

2. MED speed — move connector to MED, 65 percent cooling mode airflow.

3. HI speed — move connector of HI, 100 percent cooling mode airflow. (See Fig. 16, F as indicated.)

G. LOW-VOLTAGE CIRCUIT FUSING AND REFERENCE

The low-voltage circuit is fused by a board-mounted 5-amp automotive fuse placed in series with the transformer SEC2 and the R circuit. The C
circuit of the transformer is referenced to chassis ground through a printed circuit run at SEC1 connected to metal standoff marked with ground
symbol.

PROCEDURE 10—ACCESSORY INSTALLATION
A. Accessory Electric Heaters

Electric heaters may be installed with the FK4C Fan Coil per instructions supplied with the electric heater package.

NOTE: It is not necessary to cover the opening for accessory heaters. The unit will perform properly without this opening covered.
B. Electronic Air Cleaner Connections

Because the ICM2 blower motor used in the FK4C Fan Coil is controlled by low-voltage signals, a switched 230-vac electronic air cleaner power
signal is not available. This signal is replaced by a 24-vac signal which is provided at PCB terminals AUX1 and AUX 2 (See Fig. 16 and 17.)
This signal is present whenever the G thermostat signal is present (heat pump heating, cooling and continuous blower modes). When the FK4C
Fan Coil is installed with an electronic air cleaner, use EAC relay kit Part No. KFAIR0201ACR or a field supplied 24-vac relay.

The EAC relay kit consist of a 24-vac relay which mounts directly on the PCB bracket inside the fan coil using factory punched screw holes, 2
mounting screws, 2 pre-terminated wires for connection of relay coil to AUX1 and AUX2 terminals, 2 No. 16 AWG stripped leads for connection
of relay contacts for control of power to the EAC, wire nuts, and wiring instructions. (See Fig. 18.)

If EAC relay is field supplied, use field supplied wiring, terminations and wire per the EAC wiring schematic. (See Fig. 19.)
NOTE: If the FK4C is installed with an air conditioner and electric heat is the primary heating device, a thermostat which turns on the G output

with a call for heat is required for air cleaning or humidification during heating mode. A corporate thermostat set to "fan on with W option" is
recommended.

C. Humidifier/Humidistat Connections

Terminals HUM1 and HUM2 are provided for direct connection to the low-voltage control of a humidifier through a standard humidistat. (See
Fig. 17.) These terminals are energized with 24vac when G thermostat signal is present. (See Fig. 20.) Alternately, the 24-vac signal may be
sourced from the W and C terminal block connections.

—13—

SEC1 SEC2

EASY SELECT

AUX HEAT KW/CFM

0-30

0-20

1075

VIO

036 030 024 018

BLU

AC

ORN

AC/HP CFM ADJUST

NOM HI

BLK

09030900

WHT

YEL

CEBD430226-01B CESS430226-01B

0-10

875

725

AC/HP SIZE

SYSTEM TYPE

HP-COMFORT

LO

ON/OFF DELAY

CONTINUOUS FAN

MED HI YELLO

HEATER/MOTOR

TM

0-5
625

HP-EFF

J1

J2

D

W
W

Y/Y

H

R

1

2

Y

1

2

G
O

ENH

0

AUX1 HUM1

AUX2

C

HUM2

24VAC

GRY

ELECTRIC HEAT CONNECTOR

12-PIN MATE-N-LOCK

Fig. 17—PCB Wiring Arrangement

D. Dehumidify Capability with Standard Humidistat Connection

→

Latent capacities for systems using the FK4C Fan Coil are better than average systems. If increased latent capacity is an application requirement,
the field wiring terminal block provides connection terminals for use of standard humidistat. The FK4C Fan Coil will detect humidistat contacts
opening on increasing humidity and reduce its airflow to approximately 80 percent of nominal cooling mode airflow. This reduction will increase
system latent capacity until humidity falls to a level which causes humidistat to close its contacts. When contacts close, airflow will return to 100
percent of selected cooling airflow. To activate this mode, remove Jumper J1 and wire in a standard humidistat. (See Fig. 21.)

→

E. Dehumidify and Super Dehumidify Capabilities

This model fan coil is capable of responding to a signal from indoor system control (thermostat, thermidistat, zoning control) to operate in comfort
control modes such as Super Dehumidify Mode. Consult literature provided with indoor system control to determine if these operating modes are
available, and to see control set up instructions. No special setup or wiring of fan coil is required.

A95276

—14—

24VAC RELAY

SEC1 SEC2

EASY SELECT

AUX HEAT KW/CFM

0-30

0-20

1075

875

VIO

AC/HP SIZE

036 030 024 018

BLU

SYSTEM TYPE

AC

HP-COMFORT

ORN

AC/HP CFM ADJUST

NOM HI

BLK

ON/OFF DELAY

09030900

WHT

CONTINUOUS FAN

MED HI YELLO

YEL

CEBD430226-01B CESS430226-01B

HEATER/MOTOR

BLK

COM

LO

RED

0-10
725

RED

J1

D

J2

AUX1 HUM1

AUX2

24VAC

GRY

HUM2

H

R

W

1

W

2

Y

1

Y/Y

2

G
O
C

FK4C

AUX1

(C)

RED

AUX2

(G)

RED

230 VAC OR
115 VAC BRANCH CKT

GND HOT NEUT

BLK

GRN

WHT

TM

0-5

625

HP-EFF

ENH

0

EAC

PLUG

BLK

NO

BLK

24 VAC RELAY

BLK

NO

BLK

A95318

A95277

Fig. 18—PCB Mounted with Wiring and Accessory Air

Cleaner Relay

COM

Fig. 19—EAC Relay Wiring Schematic

EASY SELECT

BOARD TERMINAL

BLOCK

HUMIDISTAT

D

HUM 1

(C)

HUM 2

(G)

24-VAC

TO HUMIDIFIER

HUMIDIFIER WIRING

Fig. 20—Humidifier Wiring

J1

REMOVE

JUMPER

A95317

Fig. 21—Humidistat Wiring for De-Humidify Mode

H

HUMIDISTAT

R

A95316

→ CARE AND MAINTENANCE

For continuing high performance, and to minimize possible equipment failure, it is essential that periodic maintenance be performed on this
equipment. The only required maintenance that may be performed by the consumer is filter maintenance.

WARNING: Disconnect all power to unit before servicing field wires or removing control package. The disconnect

(when used) on access panel does not disconnect power to the line side of disconnect, but does allow safe service to all
other parts of unit. If unit does not have a disconnect, disregard the foregoing. Instead, make sure that a disconnecting
means is within sight from, and is readily accessible from, the unit. Disconnect all electrical power to unit before performing
any maintenance or service on it. A failure to follow this warning can cause electrical shock, fire, personal injury, or death.

The minimum maintenance requirements for this equipment are as follows:

1. Inspect and clean or replace air filter each month or as required.

2. Inspect cooling coil, drain pan, and condensate drain each cooling season for cleanliness. Clean as necessary. An inspection port is provided
on all A-coil delta plates. Remove plastic plug to inspect.

3. Inspect blower motor and wheel for cleanliness each heating and cooling season. Clean as necessary.

4. Inspect electrical connections for tightness and controls for proper operation each heating and cooling season. Service as necessary.

—15—

Consult fan coil service manual available from equipment distributor for maintenance procedures.

WARNING: As with any mechanical equipment, personal injury can result from sharp metal edges, etc, therefore, care

should be taken when removing parts.

Using Owner’s/User Manual furnished in outdoor unit, the installing technician should explain to the consumer system operation with particular
emphasis on indoor fan coil operation sounds and filter maintenance.

SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your
knowledge of the equipment discussed in this manual, including:
 • Unit Familiarization • Maintenance
 • Installation Overview • Operating Sequence
A large selection of product, theory, and skills programs is available, using popular
video-based formats and materials. All include video and/or slides, plus companion
book.

Classroom Service Training plus "hands-on" the products in our labs can mean
increased confidence that really pays dividends in faster troubleshooting, fewer
callbacks. Course descriptions and schedules are in our catalog.


CALL FOR FREE CATALOG 1-800-962-9212



[ ] Packaged Service Training [ ] Classroom Service Training

A94328

© 1997 CAC/BDP P.O. Box 70, Indianapolis, IN 46206 imfk4C04

—16—

Book/Tab: 1/3d,4/2e Catalog No. 63FK-4C0