Bryant FA4A - Manual (Page 8)

A U G / 1 4 / 2 0 0 8 / T H U 0 3 : 4 7 UTC TECH PUB F A X N o , 3 1 7 2 4 0 5 6 6 2
OPTIONAL SAFETY GROUND
Ш ® ® ® Q p
POWER CONNECTOR
CONTROL CONNECTOR
И. CFM Select Configuration Taps
The CTM Select taps are used by installer to configure system. The
ICM2 is capable of discerning wave shapes on some of its input?
and uses this capability to modify its operation to a pre­
programmed table of airflows and can be modified in response to
other
inputs Such as the need for de-humidification.
I. 1CM2 Control Power
The ICM2 control power is supplied from R circuit through
printed-circuit runs to motor control connector pin 6|, through
rnotor control harness to motor. The C side of low-vpltagc control
power circuit is connected by printed-circuit runs to motor
connector pins 4 and 5, then through motor control harness to
motor,
J. Low-Voltage Circuit Fusing and Reference
The low-voltage circuit is fused by a board-mounted 5-amp
automotive-type fuse placed in series with transformer SEC2 and
R circuit. The C circuit of transformer is referenced to chassis
ground through a printed-circuit run at SECl connected to metal
standoff marked GROUND SCREW REQUIRED,
NOTE: A ground screw must be in place or erratic motor
operation can result.
K. Transformer, Motor, and Electric Heater Power
Connections
The high-voltage (230-vac) power input to board is provided
through electric heater connector pins 7 and 9. The high voltage is
then connected through printed-circuit runs to motor power con-
A94079
ICM2 Motor
nections Ml and M2 and transforníer power connections T1 and
T3. Transformer connection T2 is a dummy terminal used for
unused primary power lead. The transformer Secondary conriec-
tions are made at SECl and SEC2 connectors.
IV, EASY SELECT CONFIGURATION TAPS
The Easy Select taps are used by installer to configuire 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 operatibh and thosd airflows arc modified in response
to other inpüts stich as the need for de-humidifícation. (Sec Fig. 6.)
The FK4B Ran 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
located next to select pins), move the 5 select wires to pins which
match components used,
A. 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. The heater installed must
fall within range selected for safe and continuous operation. It is
appropriate to mention 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
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