R circuit. The C circuit of transformer is referenced to chassis
ground through a printed-circuit run at SEC1 connected to metal
standoff marked.
NOTE:
The PCB must be mounted with 2 screws and motor
ground lead secured to blower housing or erratic motor operation
can result.
TRANSFORMER,
MOTOR,
AND
ELECTRIC
HEATER
POWER CONNECTIONS
Transformer high voltage supplied from electric heater package or
high voltage leads through 12-pin heater connector plug/recp 2.
The ICM2 power connections are made at the transformer primary
terminals. The transformer secondary connections are made at
SEC1 and SEC2 connectors.
Step 12—Easy Select Configuration Taps
The Easy Select taps are used by installer to configure system. The
ICM2 uses 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.
24.)
The FK4C, FV4A, and 40FKA Fan Coils must be configured to
operate properly with system components with which it is in-
stalled. To successfully configure a basic system (see information
printed on circuit board located next to select pins), move the 6
select wires to pins which match components used, along with
homeowner preferences.
AUXILIARY HEAT RANGE
The installer must select the auxiliary heat airflow approved for
application with kw size heater installed. If no heater is installed,
skip this step. Each select pin is marked with a range of heaters for
which airflow (also marked) is approved. For increased comfort
select the narrowest kw range matching the heater size, for
example, 0-10 for a 10-kw heater. This airflow must be greater
than the minimum CFM for electric heater application with the
size system installed 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 primary heating source. To ensure safe heater operation in heat
pump heating mode when electric heaters are energized, the ICM2
will run the higher of heat pump airflow and electric heater
airflow. The factory selection is largest heater range approved.
(See Fig. 24.)
AC/HP SIZE
The factory setting for air conditioner or heat pump size is largest
unit meant for application with model of fan coil purchased. The
installer needs to select air conditioner or heat pump size to ensure
that airflow delivered falls within proper range for size of unit
installed in all operational modes. (See Fig. 24.)
SYSTEM TYPE
The type of system must be selected.
1. AC—air conditioner
2. HP-COMFORT—provides lower airflow than air conditioner
selection (approximately 315 CFM/ton) in heating mode. In
cooling made supplies 350 CFM/ton.
3. HP-EFF—provides same airflow for heating and cooling
modes (approximately 350 CFM/ton).
The factory setting is AC. (See Fig. 24.)
AC/HP CFM ADJUST
Select low, nominal, or high airflow. To provide any of these
airflows, AC/HP ADJUST select must be moved to NOM position.
The factory selection is NOM. The adjust selections HI/LO will
regulate airflow supplied for all operational modes, except non-
heat pump heating modes, +15 percent and -10 percent respec-
tively. 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. 24.)
AC/HP TIME DELAY
Select desired time delay profile. Four motor operation delay
profiles are provided to customize and enhance system operation.
(See Fig. 24.) The selection options are:
1. The standard 90 sec off delay (factory setting 0/90).
2. No delay option used for servicing unit or when a thermostat
is utilized to perform delay functions (0/0).
3. A 30 sec on/90 sec off delay profile used when it is desirable
to allow system coils time to heat up/cool down prior to
airflow. This profile will minimize cold blow in heat pump
operation and could enhance system efficiency (30/90).
4. ENH, enhanced selection provides a 30 sec on/150 sec at 70
percent airflow and no off delay.
CONTINOUS FAN
Select desired Continuous fan profile LO, MED, or HI. Airflow are
provided to customize and enhance the continous fan functions.
(See Fig. 24.) The possible selections are:
1. LO—provides 50% of Y/Y2 Cool airflow.
2. MED—provides 65% of Cool airflow (71% on 006 model).
3. HI—provides 100% of Cool airflow.
The factory setting is LO.
Table 8—Connections and Connector (FK4C)
TYPE
CONNECTION
TYPE
CONNECTOR
PIN NO.
DESCRIPTION
Heater
Connection
12-Pin
Pin 1
Common to screw terminal G
Pin 2
Common to screw terminal Y/Y2 through diode D3
Pin 3
Common to Y1 through diode D2
Pin 4
Common to W2 screw terminal
Pin 5
Common to W2 screw terminal
Pin 6
Common to screw terminal W1 screw terminal
Pin 7
Common to W1 screw terminal
Pin 8
R 24VAC
Pin 9
Common to transformer C
Pin 10
Common to transformer C
Pin 11
Common to transformer C
Pin 12
Common to DH screw terminal
32
→