ICP FVM2X2400A User Manual FAN COIL Manuals And Guides 1209404L

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These instructions

must be read and understood completely before attempting installation.

Safety Labeling and Signal Words
DANGER,
NOTE

WARNING,

CAUTION,

and
Signal Words in Manuals
The signal word WARNING is used throughout this
manual in the following manner:

The signal words DANGER, WARNING, CAUTION, and NOTE are used to identify levels of hazard seriousness. The signal word DANGER is only
used on product labels to signify an immediate hazard. The signal words WARNING, CAUTION, and
NOTE will be used on product labels and throughout this manual and other manuals that may apply
to the product.

The signal word CAUTION is used throughout this
manual in the following manner:

DANGER - Immediate hazards which will result in
severe personal injury or death.
Signal Words on Product Labeling

WARNING - Hazards or unsafe practices which
could result in severe personal injury or death.

Signal words are used in combination with colors
and/or pictures on product labels.

CAUTION - Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE - Used to highlight suggestions which will
result in enhanced installation, reliability, or operation.

TABLE OF CONTENTS
Introduction ....................................

Care and Maintenance

Location .......................................

R-410A Quick Reference Guide .................

Heater Packages ...............................

3 - 7

Air Ducts ......................................

......................

8 - 10

Refrigerant Tubing .............................

Refrigerant Metering Device

....................

Condensate Drains ............................

Blower Motor - CFM .......................
Accessories

12 - 13

..................................

Sequence of Operation .........................

Wiring Diagram

...............................

Fan Coil Airflow

...........................

17 - 19

ECM Motor and Control ........................
Troubleshooting

ECM Motor and Controls

Start-up Procedure ............................
Specifications aresubject to change without notice

22
23

Position Unit ................................

Electrical Connections

.........................

19
....

19 -21
22

DEATH, PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD
Failure to carefully read and follow this warning
could result in equipment malfunction, property
damage, personal injury and/or death.
Installation or repairs made by unqualified persons could result in equipment malfunction, property damage, personal injury and/or death.
The information contained in this manual is intended for use by a qualified service technician familiar with safety procedures and equipped with
the proper tools and test instruments.
Installation must conform with local building
codes and with the National Electrical Code
NFPA70 current edition.
496 01 5001 03 Sep 2009

INTRODUCTION
Models FVM2X and FVM4X are designed for maximum
flexibility and can be used for upflow, horizontal left or
right, and downflow applications (accessory kit required
for downflow or horizontal right).
These units are designed to meet the low air leak
requirements currently in effect. Because of this, the units
need special attention in the condensate pan and drain
connection area and when brazing tubing.

Four fan coil sizes will combine with various outdoor unit
sizes to offer systems ranging from 11/2- 5 tons (18,000
- 60,000 BTUH) nominal cooling capacity.
All models have a factory installed and appropriately
sized hard shut-off TXV metering device.
Factory-authorized,
field-installed
electric
heater
packages are available in sizes 5 kW through 30 kW. See
Product Specification literature for available accessory
kits.

LOCATION
Select the best position which suits the installation site
conditions. The location should provide adequate
structural support, space in the front of the unit for service
access, clearance for return air and supply duct
connections, space for refrigerant piping connections and
condensate drain line connections. If heaters are being
installed make sure adequate clearance is maintained
from supply duct work. Refer to Clearances in NO TAG.
If the unit is located in an area of high humidity, nuisance
sweating of casing may occur. On these installations a
wrap of 2" fiberglass insulation with a vapor barrier is
recommended.
Figure 1

J Clearances and Unit Dimensions
OPENING

NOTE: Internal filter can be accessed from separate filter
door. If the filter can NOT be easily accessed, a remote
filter is recommended. Refer to ACCA Manual D for
remote filter sizing.

FIRE HAZARD
Failure to maintain proper clearances could result
in personal injury, death, and/or property damage.
When heaters are installed, maintain clearances
from combustible materials as specified on unit
rating plate. Do not use plastic lined or combustible flexible ducting within 36 inches of the supply
end of the fan coil.

_R_CL_N6
No

_ _

_in @;

All Sides

With
Heaters

From Supply Duct
All Sides
From First 3 feet of Supply Duct to Combustibles
From Supply Duct to Combustibles after 3 feet

0
0
1
0

Unit Size
2400
3600
4800
6000

A
153A
19¼
19¼
223A

Heaters

Unit Size
2400
3600
4800
6000

B
11
11
11
11

C
193A6
193A6
193A6
193A6

D
15%
19Y8
19Y8
221_G

E
22_G
22_G
22_G
22_G

F
17%
21Y8
21Y8
24_G

G
21
21
21
24

H (inches)
4211AG
537A6
537A6
593A6

(SERVICE ACCESS)
i ("(_OPENINGI_

38-11-82

496 01 5001 03

HEATER PACKAGES
Factory approved, field installed, UL listed heater
packages are available from the equipment supplier. See
unit rating plate for a list of factory approved heaters.

POSITION

Heaters that are not factory approved could cause
damage which would not be covered under the
equipment warranty.

UNIT

Unit can stand or lie on floor, or hang from ceiling or wall.
Allow space for wiring, piping, and servicing unit.

A. UPFLOW INSTALLATION
If return air is to be ducted through a floor, install duct flush
with floor. Set unit on floor over opening.
Side return is a field option on slope coil models. Cut
opening
per dimensions
shown in Figure 2. A
field-supplied bottom closure is required.

PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
A field fabricated auxiliary drain pan, with a separate drain is REQUIRED for all installations over a
finished living space or in any area that may be
damaged by overflow from a restricted main drain
pan. In some localities, local codes require an auxiliary drain pan for ANY horizontal installation.
Figure 2

[

Slope Coil Unit in Upflow Application
POWER
OPTIONS

SUPPLIED
SUPPLY DUCT
VOLT
ENTRY
OPTIONS

FRONT SERVICE CLEARANCE
24 - 48 models = 21"
60 model = 24"

SLOPE COIL UNIT
UNITS

SECONDARY

MODEL36SIZE 1A

DRAIN

I
PRIMARY DRAIN

II
II
II
II

FIELD MODIFIED
SIDE RETURN
LOCATION FOR
SLOPE COIL
UNITS ONLY

496 01 5001 03

SECONDARY

DRAIN

PRIMARY

DRAIN

FIELD SUPPLIED
RETURN PLENUM

Figure3

ModularUnitAssembly

B. MODULAR UNITS
FVM fan coil sizes 4800 and 6000 are two-piece modular
units. This allows for modular units to be disassembled
and components moved separately to installation area for
reassembly. This process accommodates small scuttle
holes and limiting entrances to installation sites (refer to
Figure 3).
C. HORIZONTAL

INSTALLATION

Unit must NOT be installed with access panels facing up
or down. Access panels must only face to the side.
FVM models are factory built for horizontal left installation
(refer to Figure 4 and Figure 5). They can be field
converted to horizontal right (accessory Gasket Kit
required - EBAC01GSK).
NOTE: When suspending unit from ceiling, dimples in
casing indicate suitable location of screws for mounting
metal support straps (refer to Figure 4).

BRACKET

2SCREWS
COIL BOX

Figure 4

NOTE: For optimum condensate drainage performance
in horizontal installations, unit should be leveled along its
length and width.

Slope Coil In Horizontal Left Application (FVM factory

A-COIL
HORIZONTAL

FIELD
SUPPLIED
HANGING
STRAPS

configuration)

LEFT

SECONDARY
DRAIN

PRIMARY
DRAIN

FRONT SERVICE CLEARANCE
(FULL FACE OF UNIT)
24 - 48 models = 21"
60 model= 24"

SECONDARY
DRAIN

LOW
VOLT
ENTRY
OPTIONS

13/4_

FILTER ACCESS
CLEARANCE

POWER
ENTRY
OPTIONS

PRIMARY
DRAIN

496 01 5001 03

Figure5

[

A-Coil

in Horizontal

Left Application (FVM factory configuration)

FACTORY SHIPPED
HORIZONTAL LEFT
APPLICATION

COIL
BRACKET

COIL
SUPPORT
RAI L
DRAIN PAN
SUPPORT
BRACKET

COIL
BRACKET

HORIZONTAL
DRAIN PAN

PRIMARY DRAIN
HORIZONTAL LEFT

AIR SEAL

SECONDARY DRAIN
HORIZONTALLEFT
REFRIGERANT
CONNECTIONS

Horizontal
Coils

Right Conversion

Slope

Remove blower and coil access panel and fitting
panel (refer to Figure 6).

Lay fan coil unit on its right side and reinstall coil
assembly with condensate pan down (refer to
Figure 6).

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

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

Remove coil assembly.

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.

Figure 6

[

of Units With

coil

Horizontal Right Conversion Applications - Slope Coil
COIL MOUNTING
SCREW

BLOWER
ASSEMBLY

SLOPE COIL
SKI

REFRIGERANT
CONNECTIONS

-PRIMARY

SECONDARY

496 01 5001 03

DRAIN

Add gaskets from the Gasket Accessory
EBAC01GSK.

Figure 7

Kit -

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.

Conversion for Horizontal Right Applications - A-Coil

CONNECTIONS

ASSEMBLY
HORIZONTAL
RIGHT
APPLICATION

SUPPORT
RAI L

BRACKET

DRAIN
SUPPORT
BRACKET
COIL_
SUPPORT
RAIL

BRACKET
HORIZONTAL
DRAIN PAN
PRIAMRY
HORIZONTAL RIGHT
SECONDARY
HORIZONTAL

DRAIN
RIGHT

Horizontal Right Conversion of Units With A-Coils
1.

Remove blower and coil access panel and fitting
panel (refer to Figure 7).

Remove metal clip securing fitting panel
condensate pan. Remove fitting panel.

Remove two (2) snap-in
unit.

Slide coil and pan assembly out of unit.

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.

clips securing A-coil

Convert air-seal assembly for horizontal right.
a. Remove air-seal assembly from coil by removing
four (4) screws (refer to Figure 7).
b. Remove air splitter (B) from coil seal assembly by
removing three (3) screws. (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.

Install horizontal pan on right side of coil assembly.

Slide coil assembly into casing. Be sure coil
bracket on each corner of vertical pan engages coil
support rails.

Reinstall two (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 (2) oval fitting caps from left side of
the coil, access panel, and fitting panel.
11. Remove insulation knockouts on right side of coil
access panel
12. Remove two (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 Step 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
tubing
connections
and
condensate
connections.
Be sure to reinstall metal
between fitting panel and vertical condensate

with
pan
clip
pan.

15. After brazing, make sure liquid and suction tube
grommets are in place to prevent air leaks and
cabinet sweating.

496 01 5001 03

F. DOWNFLOW
INSTALLATION

Recommended
applications:

PRODUCT
ORPROPERTY
DAMAGEHAZARD
Failureto 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-coil units. The
vertical drains have an overflow hole between the
primary and secondary drain holes. This hole is
plugged for all applications except downflow, and
must be used for downflow.
Failure to follow instructions could result in personal injury or product and property damage.

method of securing

for typical

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" lag screws. Typical both
sides of fan coil.
b,

If fan coil is against wall, secure fan coil to wall
stud using 1/8"wide right-angle brackets. Attach
brackets to fan coil using No. 10 self tapping
screws and to wall stud using 5/16" lag screws
(refer to Figure 8).
Mobile Home or Manufactured
Housing Applications

Figure 8

4" MAX

In this application, field conversion of the evaporator coil
is required using accessory Downflow Kit along with an
accessory Base Kit. Set unit on floor over opening and
use 1/8" to 1/4" thick fireproof resilient gasket between
duct, unit, and floor. Refer to installation instructions
packaged with accessory kit. See Product Specification
literature for kit part numbers.

-_)_:_

SECURE FAN COIL TO STRUCTURE

UNIT STRAP
AWAY
PIPE

_ _]
_

,---...._..

FROM WALL

(TYPICAL BOTH SIDES)
OR
\ UNIT AGAINST

WALL

1/8" INCH THICK
ANGLE MOUNTING
BRACKET
(TYPICAL BOTH SIDES)

During the conversion process, removed 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 low air leak
performance of the unit.
NOTE: Gasket kit number (EBAC01GSK)
is also
required for all downflow applications to maintain low air
leak/low sweat performance.
G. MANUFACTURED
APPLICATIONS
1.
2.

HOUSING AND MOBILE HOME

Fan coil unit must be secured to the structure
using field-supplied hardware.
Allow a minimum of 24" clearance from access
panels.

1#7
cEL--,!_
//

DOWN FLOW
BASE KIT
SECURE
UNITTO FLOOR
ANGLE BRACKET OR PIPE STRAP

MAX

AIR DUCTS
Connect supply-air duct over the outside of 3/4"flanges
provided on supply-air opening. Secure duct to flange
using proper fasteners for type of duct used, and seal
duct-to-unit joint.
Duct connections flanges
discharge connection.

are provided

on unit air

When using FVM units with 20kW, 24kW, and 30kW
electric heaters,
maintain
a 1" clearance
from
combustible materials to discharge plenum and ductwork
for a distance of 36" from unit. Use accessory downflow
base to maintain proper clearance on downflow
installations.

connection. Duct work passing through unconditioned
space must be insulated and covered with vapor barrier.
Duct work Acoustical Treatment
Metal duct systems that do not have a 90 degree elbow
and 10 feet of main duct before first branch takeoff may
require internal acoustical insulation lining. As an
alternative, fibrous duct work 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 duct work shall comply
with National Fire Protection Association as tested by UL
Standard 181 for Class 1 air ducts.

Use flexible connectors between duct work and unit to
prevent transmission of vibration. When electric heater is
installed,
use heat-resistant
material for flexible
connector between duct work and unit at discharge
496 01 5001 03

ELECTRICAL

CONNECTIONS

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.
NOTE: Before proceeding with electrical connections,
make certain that supply voltage, frequency, phase, and
circuit 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.

ELECTRICAL

SHOCK or UNIT DAMAGE HAZARD

B. 24V CONTROL SYSTEM
Control System Connections

to Fan Control Board

Refer to unit wiring instructions for recommended wiring
procedures. Use 18 AWG color-coded, insulated (35 ° C
minimum) wires to make the low-voltage connections
between the thermostat, the unit, and the outdoor
equipment. If the thermostat is located more than 100 feet
from the unit (as measured along the low voltage wire),
use 16 AWG color-coded, insulated (35 °C minimum)
wire. Fan Control Board is circuited for single-stage
heater operation. When additional heater staging is
desired using outdoor thermostats of Heat Staging,
remove Jumper J2 on Fan Control Board to enable
staging.
All wiring must be NEC Class 1 and must be separated
from incoming power leads. Refer to outdoor unit wiring
instructions for additional wiring recommendations.

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

Connect low-voltage leads to thermostat and outdoor
unit (refer to Figure 9, Figure 10, Figure 11, Figure 12).

Turn off the main (remote) disconnect device before working on incoming (field) wiring.
Incoming (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 (field) wiring cannot be performed until the main disconnect switch (remote
to the unit) is turned off.

C. HEAT STAGING
Heat Staging

Option

Heat Staging of the electric heat package is possible
when the FVM is installed as a part of a single-stage heat
pump system using a two-stage
programmable
thermostat, or capable zoning control and and one (1) of
the following electric heat packages:
Relay heaters EHK10AKN, EHK10AKB, EHK15AK(F,B),
EHK18AHN,
EHK20AK(F,B)
EHK25AHCF,
or
EHK30AHCF.

ELECTRICAL

SHOCK or UNIT DAMAGE HAZARD

Failure to follow this warning could result in personal injury, death, and/or unit damage.
If a disconnect switch is to be mounted on unit, select a location where drill and fasteners will not
contact electrical or refrigeration components.
A. LINE VOLTAGE CONNECTIONS
If unit contains an electric heater, remove and discard
power plug from fan coil and connect male plug from
heater to female plug from unit wiring harness. (Refer to
Electric Heater Installation Instructions.) For units without
electric heat:
1.

Connect 208/230V
power leads from field
disconnect to yellow and black stripped leads.

Connect ground wire to unit ground lug.

Check all factory wiring per unit wiring diagram and
inspect factory wiring connections to be sure none were
loosened in transit or installation.

Complete system low-voltage
wiring as shown
Figure 9, Figure 10, Figure 11, Figure 12.

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 1 and
must be separated from incoming power leads.
A factory-authorized
disconnect kit is available for
installation of 5 kW through 10 kW applications. When
electric heat package with circuit breakers are installed,
the circuit breaker can be used as a disconnect.
D. 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 oF. except for a heat
pump defrost cycle. In some applications, an outdoor
thermostat
may be required. Refer to thermostat
instructions for details.

496 01 5001 03

FVMFanCoilWiring

Figure 9

with
Air Conditioner

single-stage

FVM Fan Coil Wiring with
single-stage
Heat Pump

Figure 11

FAN COIL

INDOORCONTROL
INDOOR CONTROL

FAN COIL
RVS COOLING

HEAT STAGE 2

I F_

COOL

I _

STAGE

REMOVE J2 JUMPER

Fq
6_

NIA
HEAT STAGE

.....

FOR HEAT STAGING

....

FAN

....

24 VAC HOT

24VAC

COMM

....

.....

DEHUMIDIFY
24 VAC COMM

--AD

HUMIDIF--T_
(24 VAC)

HUMIDIFY

I-_-I_

.._
__

.___

OUTDOOR

E_-

"--

l-_q

--7_--I

SENSOR
OUTDOOR

FVM Fan Coil wiring with
two-stage
Air Conditioning

CONTROL

2 _

.....

42_

HEAT STAGE

I _

.....

42]

COOL

STAGE

I _

....

COOL

STAGE

2 _

....

_r"

--83

REMOVE J2 JUMPER

-----Es....

HEAT/COOL
STAGE1

HEAT STAGE3

DEHUMIDIFY

.....

24 VAC COMM

_'_

.....

24 VAC HOT

....

----D ....
....

_, REMO_

FOR HEAT STAGING
HEAT/COOL_
STAGE2

....

@]
4_
Fq
43

-q

£:

FAN

----I
L.

DEHUMIDIFY

24 VAC

COMM

--HEAT
q_JUMPERSTAGING
FOR

43....sL[ZI

.....

4Z_

.....

....
q-D

HUMIDIFY

(24 VAC)

HUMIDIFY

F_-

,_.__

HUMIDIFIER
(24 VAC)

t___

FAN COIL

RVSCOOLING

24VAC HOTElFAN

FVM Fan Coil wiring with
two-stage
Heat Pump

INDOORCONTROL

FAN COIL

HEAT STAGE

(24 VAC)

1-_

Figure 12
Figure 10

HUMIDIFIER

SENSOR
OUTDOOR

"--

I-_-I-

OUTDOOR

,ram

RVS HEATING

N/A

INDOOR

.....

....

Fa
DEHUMIDIFY

.....

J2 JUMPER
-I_ REMOVE
FOR HEAT STAGING
-I_ ._-___
r_] ---[]
-[] ....
[]
G

.....
HEAT STAGE 2 [2@]....
HEAT/COOL
....
STAGE 1
FAN I-q .....
24 VAC HOT I-q .....
HEAT STAGE 3

.....

RVS HEATING

OUTDOOR

-__

SENSOR
OUTDOOR

I--_

N/A
OUTDOOR

-___

SENSOR
OUTDOOR

t-_

-I-_-- I.

496 01 5001 03

Figure13 J

TransformerConnections

BROWN

R GROUND CONNECTIONS
NOTE: Use UL listed conduit and conduit connectors for
connecting supply wire(s) to unit to obtain proper
grounding. Grounding may also be accomplished by
using grounding lugs provided in control box. Use or dual
or multiple supply circuits will require grounding of each
circuit to ground lugs provided on unit and heaters.

RED

YELLOW

BLACK

PRIMARY

E. 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 (refer to Figure 13).
The secondary circuit of transformer is protected by a 5
amp fuse mounted on Fan Control Board.

REFRIGERANT

ELECTRICAL

Failure to establish uninterrupted
ground could result in personal
death.

or unbroken
injury and/or

According to NEC, ANSI/NFPA 70, and local
codes, the cabinet must have an uninterrupted or
unbroken ground in order to minimize potential
for personal injury or death 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.

TUBING

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. Do not use damaged, dirty, or
contaminated tubing because it may plug refrigerant flow
control device.
Always evacuate coil and field-supplied tubing to 500
microns before opening outdoor unit service valve.

PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.

Size and install refrigerant lines according to information
provided with outdoor unit. Route refrigerant lines to the
fan coil in a manner that will not obstruct service access to
the unit or removal of the filter.
,

2.
3.

METERING

Cut tubing to correct length.
Hold coil stubs steady to avoid bending or
distorting.
Fit refrigerant lines into coil stubs. Insert tube into
sweat connection on unit until it bottoms.

Wrap TXV and nearby tubing with a heat-sinking
material such as a wet cloth.

Wrap a heat sinking material such as a wet cloth
behind braze joints.

Braze connection using a silver bearing or
non-silver
brazing
materials
(SiI-Fos
or
Phos-copper alloy). Do not use solder (matrices
which melt below 800°F). Consult local code
requirements.

After brazing, allow joints to cool. Evacuate coil and
tubing system to 500 microns using deep vacuum
method.

Braze with SiI-Fos or Phos-copper alloy on copper-to-copper
joints and wrap a wet cloth around
rear of fitting to prevent damage to TXV.

REFRIGERANT

SHOCK HAZARD

DEVICE

FVM fan coils have a factory installed hard shut-off TXV
designed only for use with R-22 and R-410A
refrigerants. Use only with outdoor units designed for
corresponding refrigerants.
TXV is factory set and not field adjustable.

PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
This Fan Coil has a hard shut-off TXV metering device. A compressor Hard Start Kit is REQUIRED in
all applications where the matching outdoor unit
has a single-phase reciprocating compressor.

496 01 5001 03

CONDENSATE

DRAINS

Units are provided with primary and secondary 3/4"NPT
drain connections. Refer to Figure 2 though Figure 7 to
identify the primary and secondary locations. To prevent
property damage and achieve optimum drainage
performance, BOTH primary and secondary drain lines
should be installed
and include properly sized
condensate traps (refer to Figure 14). Factory approved
condensate traps are available (accessory part number
EBAC01CTK).

Figure 14

J Recommended

Condensate

Trap

2" MIN

To connect drain lines, the drain connection knock-outs
must be removed. Use a knife to start the opening near
the tab and using pliers, pull the tab to remove the
knock-out. Clean the edge of the opening if necessary.
After drain fittings are installed, caulk the seam between
the fitting and the cover to retain the low leak rating of the
unit.
It is recommended the PVC fittings be used on the plastic
condensate pan. Do not over-tighten.
Finger-tighten
plus 11/2turns. Use pipe dope, to ensure proper seal.

Figure 15

Insufficient Condensate

Trap

Install traps in the condensate lines as close to the coil as
possible (refer to Figure 16), but avoid blocking filter
access panel.
Install drain lines below the bottom of the drain pan and
pitch the drain lines down from the coil at least ¼ inch per
foot of run. Horizontal runs over 15 feet long must also
have an anti-siphon air vents (stand pipes), installed
ahead of the horizontal runs. Extremely long horizontal
runs may require oversized drain lines to eliminate air
trapping.
Route primary drain line to the outside or to a floor drain.
Check local codes before connecting to a waste (sewer)
line.
Route the secondary drain line to a place in compliance
with local installation codes where it will be noticed when
unit is operational. Condensate flowing from secondary
(overflow) drain indicates a plugged primary drain - unit
requires service or water damage will occur.

DO NOT USE SHALLOW RUNNING TRAPS!

Figure 16

Condensate

Drain

o
T

Prime all traps, test for leaks, and insulate drain lines
where sweating could cause water damage. Consult local
codes for additional requirements or precautions.
o

If a gravity drain cannot be used, install a condensate
pump. Install the pump as close to the indoor section as
possible.

FILTER
ACCESS
PAN EL
WITH

___(USE

PRODUCT or PROPERTY DAMAGE HAZARD

TRAP REQUIRED
FACTORY KIT OR
FIELD-SUPPLIED TRAP)

Failure to follow this caution may result in product
or property damage.

PRIMARY TRAP REQUIRED (USE FACTORY KIT OR
FIELD-SUPPLIED
TRAP OF PROPER DEPTH.
STANDARD P-TRAPS ARE NOT SUFFICIENT. SEE

Use only full size P-traps in the condensate line
(refer to Figure 14). Shallow, running traps are inadequate and DO NOT allow proper condensate
drainage (refer to Figure 15).

FIGURE OF RECOMMENDED

496 01 5001 03

CONDENSATE

TRAP)

BLOWER

MOTOR - CFM

FAN CONTROL BOARD CONFIGURATION

TAPS

Fan Control Board taps are used by the installer to
configure a system. The ECM motor uses the selected
taps to modify its operation to a pre-programmed table of
airflows (Refer to Table 2 and Table 3). 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. (Refer to Figure 17 and
Figure 18).
FVM fan coils must be configured to operate properly with
system components with which it is installed. To
successfully configure a basic system (see information
printed on circuit board label located next to select pins),
move the 6 select wires to the pins which match the
components used.
Figure 17

Fan Control

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 ECM motor 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. (Refer to Figure 17, A as
indicated)
Fan Control Board
Wiring Arrangement

Figure 18

Board

LOW VOLTAGE TERMINAL BLOCK
AUX

HEAT

KW/CFM

FAN CONTROL BOARD

(Z_

SEC2
(Z)

SECt

AUX

HEAT KW/CFM
B
C

v-q

AC/HP
A

-:!S=!,o

SIZE
c

B.__,,._
•

SYSTEM

c--_

AiJ

TYPE

HPC_M ......

AC/HP

_FF

CFM ADJUST

D.__,,_
•

ON/OFF

DELAY

ZMOLEX12

AUX2

HUM2

PIN CONNECTOR

A. AUXILIARY HEAT KW/CFM
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. (Refer to Figure 17,
A)
The select pins are marked A, B, C, D. Heater kW ranges
corresponding to each letter are listed in a chart on the
unit wiring diagram. Refer to the unit wiring diagram and
select the pin for the heater size being used (example
wiring diagram in Figure 21).
The airflow must be greater than the minimum CFM for
electric heater application with the size system installed
for safe and continuous operation. (Refer to Table 4 and
Table 5 for airflow delivery and minimum CFM.)
12

B. AC/HP SIZE
Select System Size Installed
The factory setting for air conditioner or heat pump size is
the largest outdoor 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. (Refer to Figure 17, B)
The select pins are marked A, B, C, D. Outdoor unit sizes
corresponding to each letter are listed in a chart on the
unit wiring diagram. Refer to the unit wiring diagram and
select the pin for the outdoor unit size being used
(example wiring diagram in Figure 21).

496 01 5001 03

C.SYSTEMTYPE
SelectSystemType

3.
Installed AC or HP

The type of system must be selected:
1.

AC - Air Conditioner provides approximately 350
CFM per ton for greater efficiency and humidity
control with the AC/HP CFM ADJUST set to the
nominal (NOM) tap. (To achieve approximately 400
CFM per ton move tap to (HI) position. Refer to
appropriate airflow tables for exact CFM setting.)
HP-COMFORT
- Heat Pump Comfort Provides
approximately 315 CFM per ton for higher than
normal heating air delivery temperature. Provides
approximately 350 CFM per ton cooling airflow for
good humidity removal with the AC/HP CFM
ADJUST set to the nominal (NOM) tap.
HP-EFF - Heat Pump Efficiency provides same
airflow for heating and cooling modes to increase
overall HP efficiency; approximately 350 CFM per
ton with the AC/HP CFM ADJUST set to the
nominal (NOM) tap.

The factory setting is AC (Refer to Figure 17, C).
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.
HI provides 15% airflow over nominal unit size selected
and LO provides 10% airflow below nominal unit size
selected.
Adjust selection options are provided to adjust airflow
supplied to meet individual installation needs for such
things as noise, comfort, and humidity removal. (Refer to
Figure 17, D as indicated.)
E. ON/OFF DELAY
Select desired time delay profile
NOTE: Delay selections are active in cooling and heat
pump heating modes only. Auxiliary heating modes have
a one (1) minute off delay and zero (0) on delay
programmed
into the ECM motor that cannot be
overridden.
Four (4) motor operation delay profiles are provided to
customize and enhance system operation. (Refer to
Figure 17, E as indicated.)
Selection options are:
1.

0/90: No on delay and 90 second off delay at 100%
airflow (factory setting).

30/90:30 second on delay with no airflow and 90
second off delay at 100% airflow profile. Used when
it is desirable to allow system coils time to
heat-up/cool-down
in conjunction with the airflow.

496 01 5001 03

0/0: No delay option. Used for servicing unit or when
a thermostat is utilized to perform delay functions.

ENH: enhanced selection, provides a 30 second on
delay with no airflow followed by 150 seconds at
70% airflow, and no off delay for added comfort.
This profile will minimize cold blow in heat pump
operation and could enhance system efficiency.
F. CONTINUOUS FAN
Select desired fan speed when thermostat
continuous fan

is set on

NOTE: If installed with a two-stage outdoor unit, do not
select HI speed continuous fan. If HI is selected, low
stage compression will also run HI fan speed possibly
resulting in insufficient dehumidification.
1.

LO speed - factory setting, 50% cooling mode
airflow.

MED speed - move connector to MED, 80% cooling
mode airflow.

HI speed - move connector to HI, 100% cooling
mode airflow. (Refer to Figure 17, 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.
H. BASIC FAN COIL CONFIGURATION
The following basic configuration of the fan coil will
provide ARI rated performance of an air conditioner:
1. AUX HEAT KW/CFM - Select the heater range for
the size electric heater installed.
2.

AC/HP SIZE - Select system size installed.

3.
4.

SYSTEM TYPE - Select system type AC
AC/HP CFM ADJUST - Select NOM.

5.
6.

ON/OFF DELAY - Select 0/90 profile.
CONTINUOUS FAN - Select desired fan speed
when thermostat is set to continuous fan.

The following basic configuration of the fan coil will
provide ARI rated performance of a heat pump:
1. AUX HEAT KW/CFM - Select the heater range for
the size electric heater installed.
2.

AC/HP SIZE - Select system size installed.

3.
4.

SYSTEM TYPE - Select system type HP-EFF
AC/HP CFM ADJUST - Select NOM.

ON/OFF DELAY - Select 0/90 profile.

CONTINUOUS FAN - Select desired fan speed
when thermostat is set to continuous fan.

ACCESSORIES
A. ACCESSORY ELECTRIC HEATERS
Electric heaters may be installed with the FVM fan coil per
instructions supplied with electric heater package. See
unit rating plate for factory-approved electric heater kits.
B. AUXILIARY TERMINALS

Figure 19

Humidifier Wiring
HUMIDISTAT

HUM 1
(C)

24-VAC

The AUX2 and HUM2 terminals on the Fan Control Board
are tied directly to the G terminal, and provide a 24 VAC
signal whenever the G terminal is energized. (Refer to
Figure 17 and Figure 18)

HUM 2

C. HUMIDIFIER / HUMIDISTAT CONNECTIONS

Figure 20

Fan Control Board terminals HUM1 (directly connected
internally to C on terminal block) and HUM2 (directly
connected internally to G on terminal block) are provided
for direct connections to the low-voltage control of a
humidifier through a standard humidistat (refer to
Figure 19). These terminals are energized with 24 VAC
when G thermostat signal is present (refer to Figure 22).
Alternately, the 24VAC signal may be sourced from the
W1 and C terminal block connections when electric
heaters are used as a primary heating source (refer to
Figure 20). When using a thermostat with humidity
control, the 24VAC signal may be sourced directly from
humidity terminal on the thermostat. (Refer to Figure 9,
Figure 10, Figure 11, or Figure 12.)

TO HUMIDIFIER

(G)

(TERMINAL
BOARD
CONNECTIONS)

24-VAC

Humidifier Wiring for Electric Heat
Primary Heating Source
H U M IDISTAT

TO HUMIDIFIER

D. DEHUMIDIFY
CAPABILITY
HUMIDISTAT CONNECTION

WITH

STANDARD

Latent capacities for systems using the FVM fan coil are
better than average systems. If increased latent capacity
is an application requirement, the field wiring terminal
block provides a connection terminal (H) for use of a
standard humidy sensor/control. The FVM will detect the
humidy sensor/control contact closing on increasing
humidity and reduce its airflow to approximately 80% of
nominal cooling mode airflow. This reduction will increase
the system latent capacity until the humidity falls to a level
which causes the humidity sensor/control to open its
contacts.
When the contacts open, the airflow will return to 100% of
the selected cooling airflow.

496 01 5001 03

SEQUENCE

OF OPERATION

FVM fan coils will supply airflow in a range which is more
than twice the range of a standard fan coil. Each fan coil
size is designed to provide nominal cooling capacities at
50 oF evaporator temperature and the required airflow in
order to match with any of four (4) different air conditioner
or heat pump outdoor unit sizes. Table 1 outline the CFM
range for the different FVM fan coils.

F. HEAT PUMP HEATING MODE - SINGLE STAGE

The blower motor is a true variable speed motor designed
to deliver constant CFM. Constant CFM is valid for
systems with total external static pressure between 0.1
and 0.7 inches water column.

G. HEAT PUMP HEATING MODE - TWO STAGE

A. CONTINUOUS

FAN

•

Thermostat closes circuit R to G.

•

Blower runs at continuous fan airflow.

B. COOLING MODE - SINGLE STAGE
If indoor temperature is above temperature set
point and humidity is below humidity set point,
thermostat closes circuits R to G, R to Y/Y2 and R to
O.
NOTE:
•

For single stage systems, do not use the Y1
terminal.

Fan coil delivers single stage cooling airflow.

C. COOLING MODE - TWO STAGE
•

First stage (low) cooling: Thermostat closes circuits
to R to G, R to O, and R to Y1.

•

Fan coil delivers low stage cooling airflow.

•

Second stage (high) cooling: Thermostat closes
circuits to R to G, R to O, R to Y1 and R to Y/Y2.

•

Fan coil delivers high stage cooling airflow

D COOLING MODE - DEHUMIDIFICATION
If indoor temperature is above temperature set
point and humidity is above humidity set point,
thermostat closes circuits R to G, R to Y/Y2 and R to
O and humidistat closes R to H.
•

•

Thermostat closes circuits R to G and R to Y/Y2.

NOTE:
•

For single stage systems, do not use the Y1
terminal.

Fan coil delivers single stage heat pump heating
airflow.

•

First stage (low) heating: Thermostat closes circuits
R to G and R to Y1.

•

Fan coil delivers low stage heating airflow.

•

Second stage (high) heating: Thermostat closes R
to G, R to Y1 and R to Y/Y2.

•

Fan coil delivers high stage heating airflow.

H. HEAT
PUMP
HEATING
ELECTRIC HEAT
•

WITH

AUXILIARY

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).

If the thermostat calls for electric heat when the heat
pump is operating in heating or defrost, the motor will
modify the airflow if necessary. The motor will provide an
airflow which is safe for the operation of the electric heat.
That airflow is the greater of the heat pump heating airflow
and the electric heat only airflow.

ELECTRICAL

SHOCK or UNIT DAMAGE HAZARD

Failure to carefully read and follow this CAUTION
warning could result in equipment malfunction,
property damage, personal injury and/or death.
Disconnect power to unit before removing or replacing connectors or servicing motor. Wait at
least five (5) minutes after disconnecting power
before opening motor.

The fan coil delivers airflow which is approximately
80% of the nominal cooling airflow to increase the
latent capacity of the system.

E. ELECTRIC HEAT HEATING MODE
•

Thermostat closes circuit R to W/W1, or W2

•

Fan coil delivers the selected electric heat airflow.

496 01 5001 03

Figure21 J

Wiring Diagram
i

AIRFLOW

THIS COMPARTMENT MUST BE
CLOSED EXCEPT FOR SERVICING

BLOWER MOTOR 1

i
i

UNIT SIZE
VlO
2400

A
0-20/1100

3600
4800
6000

0-20/1225
0-30/1500
0-30/1750

(

COOLINGONLYSCHEMATIC

DIAGRAM

)
-i

FIELD POWER WIRING

TABLE

AUX HEAT RANGE (KW/CFM)
B
C
D
0-15/875
0-10/675
0-5/625
0-15/1100
0-20/1250
0-20/1525

0-10/875
0-1511100
0-1511350

0-51800
0-10/975
0-1011100

DISCONNECT PER NEC

i
L

ADJUST

SEE RATING PLATE
FOR VOLTS & HERTZ

AC/HP

t
BLU

SEE NOTE #1

L2,

_O]GNU

SIZE

D
18

2400

3600

4800

6000

24
30
36

LEGEND
PLUG 2
3

4 _

RECP 2

- ,
-.

FIELD POWERWIRING

GND

EQUIPMENT GROUND

MARKED TERMINAL

ECM

FAN MOTOR

PLUG AND RECEPTACLE

PCB

PRINTED CIRCUIT BOARD

BRN

PCB
SEC2
SEE NOTE 8
KW

AUX HEAT KW/CFM

COM

COMMON

RECP

RECEPTACLE

LOW VOLTAGE FUSE
t-

TRAN

TRANSFORMER

r
SEC2

AC!HP SIZE

)

ARRANGEMENT

m]_

SEC1

t 230V
t

COMPONENT

i
i
i

R
i

A/2

i
C

j_i
O

SYSTEM TYPE

WY2

HP-COMFORT
O

AC/HP CFM ADJUST

t YEL

ON/OFF DELAY

IOlOlOlOlOlOlOlOlOlOlOlOl
PL1

HEATER/MOTOR

=
i

r- i
2":"['"]

REDt'_
; I ECM I

_
-

<: :'COM

",230 V

RECP 3

RECP 4

GRY

1. Use copperwire (75%min) only between DisconnectSwitch
and unit.
2. To be wired inaccordancewith N.E.C.and bcal codes.
3. Transformerprimaryleads,blue 208v, red 230v.
4. If any offlqe originalwire, as supplied, mustbe replaced,
use lhe same or equivalenttype wire.
5. Replacelow voltagefuse with no greaterthan 5 amp fuse.
6. Use 60 amp dass K fuses only,for replacement.
7. Connect R to R, G to G, etc., see outdoor instructionfor
details.
8. Use tableto selectproper airflowfor aux heat size and
AC/HP size.
332385-101 REV. B

496 01 5001 03

FAN COIL AIRFLOW
Table 1

CFM Range

Fan Coil Size

Use with Outdoor

Unit Size

CFM Range

2400

18, 24, 30, 36

350 - 1200

3600

24, 30, 36, 42

415-

1400

4800

30, 36, 42, 48

425-

1600

6000

36, 42, 48, 60

540 - 2000

Table 2
Fan
Coil
Size

2400

3600

4800

6000

Fan Coil Airflow Delivery (CFM) in Cooling
Outdoor
Unit
Size

Two-Stage

Single Stage
Cooling
Nominal

Dehum

525

420

700

560

875

36
24

Cooling

High
Nominal

Mode (A/C or HP)
Fan Only

Low
Dehum

Nominal

Dehum

Low

Med

Two-Stage outdoor unit not offered
700
560
560
450

350

420

525

350

560

700

Two-Stage

440

700

875

1050

840

1050

840

670

525

840

1050

700

560

700

560

450

415

560

700

875

700

Two-Stage

440

700

875

1050

840

1050

525

840

1050

1225

980

Two-Stage

outdoor unit not offered

615

980

1225

875

700

Two-Stage

outdoor unit not offered

440

700

875

1050

840

1050

525

840

1050

1225

980

Two-Stage

615

980

1225

1400

1120

1400

1120

900

700

1120

1400

1050

840

1050

840

670

540

840

1050

1225

980

Two-Stage

615

980

1225

1400

1120

1400

1120

900

700

1120

1400

1750

1400

1750

1400

1120

875

1400

1750

outdoor unit not offered

outdoor unit not offered
840

840

670

outdoor unit not offered

NOTES:
1. The above airflows result with the AC/HP CFM ADJUST select jumper set on NOM.
2. Airflow can be adjusted +15% or -10% by selecting Hi or Lo respectively for all modes except fan only.
3. Dry coil at 230 volts and with 10kW heater and filter installed.
4. Airflows shown are valid for systems with total static pressure between 0.1 and 0.7 in wc.

496 01 5001 03

FanCoil

Table 3
Fan
Coil
Size

2400

3600

4800

6000

Outdoor
Unit
Size

Airflow Delivery (CFM) in Heat Pump Heating Mode Only
Two-Stage

Single Stage HP
Heating

HP Heating

High

Fan Only

Low

Comfort

Eft

475

525

Comfort

Eft

Comfort

Eft

Low

Med

outdoor unit not offered

350

38O

475

Two-Stage

630

700

630

350

5O5

630

785

875

Two-Stage

440

63O

785

945

1050

945

1050

755

840

525

755

945

630

700

630

700

505

560

415

5O5

630

785

875

Two-Stage

945

1050

945

440
525

63O
755

785
945

1100

1225

Two-Stage

outdoor unit not offered

615

88O

1100

785

875

Two-Stage

outdoor unit not offered

440

63O

785

945

1050

945

525

700

505

560

outdoor unit not offered

outdoor unit not offered
1050

755

1050

840

755

840

755

945

615

88O

1100

1225

Two-Stage

1260

1400

1260

1400

1010

1120

700

1010

1260

945

1050

945

1050

755

840

540

755

945

1100

1225

Two-Stage

88O

1260

1400

1260

1400

1010

1120

615
700

1010

1100
1260

1575

1750

1575

1750

1260

1400

875

1260

1575

outdoor unit not offered

2400

3600

Airflow Delivery (CFM)
Outdoor
Unit
Capacity
(BTUH)

Electric
0-5
NOM

NOM

625

675

650

725

835

725

835

815

905

1040

9O5

980

1085

1250

980

1085

675

725

835

875

815

905

1040

9O5

980

1085

1250

875
980

1140

1270

1460

1140

6000

0-15

0-10

4800

Heater kW Range

0-10
LO

NOM

1040

875
900

875
1040

1100

1250

980

1085

1250

1100

1250

1085

1040
1250

1100
1100

1100
1250

1225

1250

1270

1460

1140

1270

1460

1225

1270

1460

0-15

975

1040

1100

980

1085

1250

1140

1270

1460

1305

1450

1100

1140

48
60

0 - 20

0 - 30

1100

.....

1100

1250

1140

1270

1460

1250

1270

1460

1665

1305

1450

1665

1305

1450

1665

1500

1100

1250

1350

.....

1270

1460

1350

1460

1525

1305

1450

1665

1350

1450

1665

1525

1665

1750

1630

1810

2085

1630

1810

2085

1630

1810

2085

1750

1810

2085

1500

1665
*

Airflow not recommended for heater/system size
NOTE: LO, NOM, and HI refer to AC/HP CFM ADJUST selection on the control board.
18

496 01 5001 03

Table5
FVM
ModelSize

HeatPumpMinimumCFMfor

Electric Heater Application
Heater Size kW

Outdoor
Unit Size

8, 9, 10

18, 20

18
24
3O

625
650
800

625
725
875

....
875
875

-1040

970

1040

675

875

....

3O
36

800
975

875
975

1100
1100

1150
1225

1125

1225

3O
36

800
975
1125

875
975
1125

875
1100
1125

1150
1225
1225

1305

1100
1125
1300

1350
1350
1350

1350
1350
1465

1625

1750

1750
1750

18,20

24,30

2400

3600

4800

42
48
36
42

6000

48
6O

A/C Minimum

CFM when

FVM
Model Size

using
8,9,10

Electric

24,30

1400

Heat (CFM)

Heater Size kW
15

2400

625

725

875

3600
4800

675
675

7OO
7OO

85O
85O

1050
1050

1400

1050

1750

Heater Only

6000
NOTES:

1. Heater Only-Air conditioner with electric heater application.
2. These airflows are minimum acceptable airflows as UL listed. Actual airflow delivered will be per airflow delivery chart
for Electric Heating Modes.

ECM MOTOR AND CONTROL
The ECM motor used with this product contains two parts: The control module and motor winding section. Do not
assume the motor or module is defective if it will not start. Go through the steps described below before replacing control
module, Fan Control Board or entire motor. The control module is available as a replacement part.

TROUBLESHOOTING

ECM MOTOR AND CONTROLS

A. IF MOTOR TURNS SLOWLY:
1.
,

Replace access panel. Motor may appear to run
slowly if access panel is removed.
It is normal operation to run noticeable slower if G
terminal is not energized in cooling or heat-pump
modes.

B. IF MOTOR DOES NOT RUN:
Turn off power and check the following:
1.
2.
,

Check 5 amp fuse on Fan Control Board.
Check for 24 VAC on SEC1 and SEC2. If no voltage
is present, check transformer.
Check all plugs and receptacles
for any
deformation which could cause loose connections.
Be sure plugs are fully seated.

496 01 5001 03

Verify that approximately
motor.

Verify low-voltage control signals to motor. The
motor receives its control signals through the
12-pin plug (PL-1) on Fan Control Board and
16-pin
plug on wiring
harness. (Refer to
Troubleshooting Example.) The combinations of
pins energized will determine motor speed. (Refer
to Figure 22). Refer to Table 6 for circuit board,
low-voltage screw terminals energized and for
voltage present at each pin on 12-pin plug (PL-1).
Refer to Table 6 for pin number on 16-pin plug
which should have voltage when Fan Control Board
screw terminals have 24 VAC.

230 VAC is present at

Figure22 J

CONTROLSIGNALS(FANCONTROLBOARD& 16-PinPLUG)

J2JUMPER

PULL FOR
HEAT STAGING

SEC1
_

SEC2
{[_)

_FF

DEHUMIDIFICATION

INPUT

24 VAC HOT

AUXILARY

HEAT STAGE 1

Ilkh-H) l W2 --

AUXILIARY

HEAT STAGE 2

LOW STAGE COMPRESSOR

SINGLE OR HI STAGE COMPRESSOR

_Y/Y2

AC,_Hp
CFMADJUST

ONOFF

SCREW TERMINALS

-_J_ \[[ 1

AC,H.
PS_ZE____
--

LOW VOLTAGE

II LH_4)I G

FAN

REVERSING

VALVE

DELAY

COMMON

?
PIN 12

y v

......
........ \ oRY=_=o

\
(PL 1)

PIN 1

16-PtN

PLUG

W 1

A03004

C. USE THE FOLLOWING
CONTROL SIGNALS:

PROCEDURE

TO CHECK

wires from

Fan Control

THERMOSTAT
1.

Remove
Board.

all thermostat

Jumper screw terminals (one at a time): R-G,
R-Y/Y2, R-Y1, R-W1. If motor runs in all cases,
thermostat is miswired, configured incorrectly or
defective. If motor runs in some cases, but not
others, continue to check wiring harness and circuit
board.
WIRING HARNESS
1.

Shut off power to unit; wait five (5) minutes.

2.
3.

Remove 5-pin plug from motor.
Remove 16-pin from motor.

Replace 5-pin plug and turn power on.

Check for appropriate
voltages on 16-pin
connector with screw terminals jumpered. (Refer to
Table 6 for values and refer to examples below.)

If signals check correctly and motor does not run, inspect
wiring harness for loose pins or damaged plastic that
could cause poor connections. If connections are good,
either control module or motor is defective. If proper
signals are not present, check circuit board using
procedure below:

If proper signals are not present, replace Fan Control
Board. If present at board and not at 16-pin connector,
wiring harness is defective.
TROUBLESHOOTING
EXAMPLE:
Motor is not running on a call for heat pump heating.
System is a single-stage heat pump.
1. After performing checks in Thermostat section,
follow Steps 1 through 5 in Wiring Harness section.
Then proceed with example.
2. With all thermostat wires removed from Fan Control
Board, place a jumper wire between R and Y/Y2
low-voltage screw terminals on the Fan Control
Board.
3. Check Table 6 for pin number on 16-pin connector
associated with the Y/Y2 signal. The correct pin is
#14. The far right column shows that (-) 12 VDC
should be present between pin #14 and pin #1
(common) on the 16-pin connector.
4. Set meter to read DC voltage. Place meter between
pins #1 and #14 and check for (-) 12 VDC (common
side of meter on pin #1). If signal is present, the
problem is in the module or motor. If signal is not,
problem is either in wiring harness or Fan Control
Board.
These steps
operation.

can

be repeated

for other

modes

12-PIN PLUG (PL-1)ON FAN CONTROL BOARD
1. Unplug harness from board.
2. Check for appropriate voltages on pins with Fan
Control Board screw terminals jumpered. (Refer to
Table 6 for values and refer to example below.)

496 01 5001 03

Table6

WiringConnectionsof FVMFanCoil WiringHarness
WIRINGHARNESS
CONNECTION
16-1NPLUGONWIRINGHARNESS
TO MOTOR
TOFANCONTROLBOARD
Pinon
16-Pin Plug

Pinon 12-pin
plug or Set-up
Selection

Description

Common

WireColor

Signalon Pinwith
ScrewTerminal
Jumperedto R*

Pin 9 on PL-1

Brown

Pin 7 on PL-1

Violet

Common

Pin 10 on PL-1

Orange

On/Off Delay
Selection

White

AC/HP Size
Selection

Blue

Pin 3 on PL-1

Black

AC/HP CFM
Adjust Selection

Black

Not Used

N/A

Not Used

System Type
Selection

Orange

Dehumidify

Pin 12 on PL-1

Gray

Aux Heat Size
Selection

Violet

24V AC

Pin 8 on PL-1

Red

24VAC continuous

Aux Heat Stage 2

Pin 4 on PL-1

White

24VAC**

Y/Y2

Single Stage AC or
HP, High Speed
Two-Stage AC or HP

Pin 2 on PL-1

Yellow

(-) 12DC**

Fan

Pin 1 on PL-1

Green

24VAC**

Not Used

N/A

Not Used

Aux Heat Stage 1

Low Speed AC or HP

24VAC**

(-) 12VDC**

0V (24VAC on no
call)

* Check voltages with 16-Pin Plug disconnected from motor.
** These signals will start motor.
D. VERIFY MOTOR WINDING SECTION
To check Fan Control Board:
1.

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

Check Table 6 under"Wiring Harness Connection
to Fan Control Board" column and row for pin #14 to
see pin# on Fan Control Board that should have
voltage. The correct pin is #2. The column on far
right will show voltage that should be present
between pin #2 and #9 (or #10 common).
Place meter between pins #2 and #9 and Fan
Control Board and check for (-) 12 VDC

3.
4.

If voltage is present, the wiring harness is bad; if not,
the Fan Control Board is bad.

496 01 5001 03

Before proceeding with module replacement, check the
following to ensure motor winding section is functional.
With control module removed and unplugged from
winding section:
1.

The resistance between any 2 motor leads should
be similar.

The resistance between any motor lead and the
unpainted motor end plate should be greater than
100K ohms.

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

START-UP

PROCEDURE

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

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 system should be regularly inspected by a qualified
service technician. Consult the servicing dealer for
recommended frequency.

Condensate Drain
During the cooling season check at least monthly for free
flow of drainage and clean if necessary.
An inspection port is provided on all A-coil delta plates.
Remove plastic plug to inspect.

Between visits, the only consumer service recommended
or required is air filter maintenance and condensate drain
operation.
Air Filter

PRODUCT DAMAGE HAZARD

The only required maintenance that may be performed by
the consumer if filter maintenance.

Failure to follow this caution may result in poor
unit performance and/or product damage.

Inspect air filters at least monthly and replace or clean as
required. Disposable type filters should be replaced.
Reusable type filters may be cleaned by soaking in mild
detergent and rinsing with cold water. Install filters with
the arrows on the side pointing in the direction of air flow.

Never operate unit without a filter. 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 fieldsupplied filter must be installed in the return duct
system.

496 01 5001 03

R-410A

QUICK REFERENCE

GUIDE

° R-410A refrigerant operates at 50% - 70% higher pressures than R-22.
replacement components are designed to operate with R-410A.

Be sure that servicing equipment and

° R-410A refrigerant cylinders are rose colored.
° Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
° R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the
manifold hose.
° Manifold sets should be 750 psig high-side

and 200 psig low-side with 520 psig low-side retard.

° Use hoses with 750 psig service pressure rating.
° Leak detectors should be designed to detect HFC refrigerant.
° R-410A, as with other HFC refrigerants, is only compatible with POE oils.
° POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
° POE oils may cause damage to certain plastics and roofing materials.
° Vacuum pumps will not remove moisture from oil.
° A liquid line filter-drier

is required on every unit.

° Do not use liquid line filter-driers

with rated working pressures less than 600 psig.

° Do not install a suction line filter-drier
° Wrap all filter-driers

in liquid line.

and service valves with wet cloth when brazing.

° Do not use with an R-22 TXV.
° If indoor unit is equipped with an R-22 TXV, it must be changed to an R-410A TXV.
° Do not use capillary tube indoor coils.
° Never open system to atmosphere while it is under a vacuum.
° When system must be opened for service, break vacuum with dry nitrogen and replace all filter-driers.
° Do not vent R-410A

into the atmosphere.

° Observe all WARNINGS,

496 01 5001 03

CAUTIONS,

NOTES, and bold text.

International Comfort Products, LLC
Lewisburg, TN 37091 USA

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ICP FVM2X2400A User Manual FAN COIL Manuals And Guides 1209404L

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