Installation Manual

INST ALLATION INSTRUCTIONS Fan Coils: FCM4X
496 01 4201 04 11
requiring outdoor temperature if an OAT is not added to
fan coil. If an OAT is added in the fan coil, the fan coil
connected OAT will be used for system level functions and
the factory supplied outdoor unit OAT will be used for
outdoor unit control functions.
Using two wires of field- supplied thermostat wire cable,
wire one lead of thermistor to one screw terminal and the
other lead to remaining screw terminal; there is no polarity
to be observed. It is strongly recommended that two wires
be used to connect the thermistor to eliminate noise
interference in temperature reading. If there are not two
spare wires available in cable, one wire may be used to
connect thermistor to OAT screw terminal 1 and the other
lead of the thermistor can be wired to 24VAC COM (C)
wire. OAT screw terminal 1 is terminal located closest to
the DX+DX- CR system communications and is marked
with a small number 1 next to the terminal strip.
NOTE: Mis- wiring OAT inputs will not cause damage to
either fan coil control or thermistor. If the thermistor is
wired incorrectly, no reading will appear at Wall Control.
Re- wire thermistor correctly for normal operation.
C. Electronic Air Cleaner Connections
In communicating mode the G signal isn’t active on this
control board. Only electric air cleaners that do not rely on
the HVAC system to activate the electronic air cleaner
should be used with communicating systems. See Electric
air cleaner instructions for installation.
D. Humidifier Connections
The fan coil control terminal marked “HUM” is provided for
low voltage (24VAC) control of a humidifier. No humidistat
is required as W all Control monitors indoor humidity. When
commanded to operate humidifier , the fan coil control will
energize the “HUM” output to turn humidifier on and
de- energize HUM output to turn humidifier off. Wire
“HUM” and “C” terminals directly to humidifier as shown in
Fig. 9 or 10.
E. System Shutdown Accessories
To shutdown the system through a shutdown accessory
such as a condensate overflow switch, break the R
terminal connection to the unit (OD or ID) that you wish to
shutdown.
Procedure 9. — Start- Up and Troubleshooting
NOTE: Always check high and low voltage supply to the
fan coil components. Check the integrity of the plug
receptacle connections and fan coil wiring harness prior to
assuming a component failure.
A. LED Description:
LEDs built into fan coil control provide installer or service
person information concerning operation and/or fault
condition of the fan coil control and ECM motor. This
information is also available at the Wall Control in text with
basic troubleshooting instructions. Careful use of
information displayed will reduce the need for extensive
manual troubleshooting.
The amber LED located at bottom center of control
adjacent to motor harness plug is motor status LED and it
is labeled MOTOR. A second amber LED located in upper
right center of control adjacent to System Communications
connector (DX+DX- CR) is the System Status LED and it
is labeled STATUS. The green LED labeled COMM is also
located adjacent to System Communications connector,
below STATUS LED, and is used as an indicator of system
communications status. Status Codes will be displayed on
the STATUS LED using the following protocol:
1. The number of short flashes indicates first digit of
code.
2. The number of long flashes indicates second digit of
code.
3. A short flash is 0.25 seconds on. A long flash is 1
second on.
4. The time between flashes is 0.25 seconds.
5. The time between last short flash and first long flash is
1 second.
6. The LED will be off for 2.5 seconds before repeating
code.
Figure 14
Detail of FCM4X Printed Circuit
Board Connections
SEC- 1SEC- 2
FUSE 3AMP
HEATER
ST ATUS
COMM
MOTOR
HPT
OPN
COM
CLS
G
W
R
C
HUM
Y
O
DX+DX- C R
B. Fan Coil Control Start- Up and System
Communications Troubleshooting:
On power up, green COMM LED will be turned off until
successful system communications are established (this
should happen within 10 seconds). Once communications