Sequence Of Operation - Carrier FA4ANF Service Manual

DO NOT REMOVE
OPTIONAL
SAFETY
GROUND
DRAIN
HOLE
Connection to heater panel is made through 12-circuit connector
P1. Connections to thermostat are made at screw terminals. Line
voltage for ICM2 is made through 7-circuit connector P2. Eighteen
quick-connect terminals comprise field select taps for motor.
Fuse Data: 5-amp automotive-type ATC/ATO (tan)
32v
200 percent current opening time of 5 sec maximum
ELECTRICAL CONNECTIONS
Eighteen 0.187-in quick-connect terminals are used to provide
programming selections for operating modes of ICM2. The 5
selection modes are listed below. For additional information, refer
to Easy Select Configuration Taps section.
AUX Heat Range—(Violet Wire)
AC/HP Size—(Blue Wire)
Type—(Orange Wire)
AC/HP CFM Adjust—(Black Wire)
AC/HP Time Delay—(Grey Wire)
Step 3—Sequence of Operation
CONTINUOUS FAN MODE
The thermostat closes circuit R to G. The G signal is sent directly
to ICM2.
Fig. 15—FK4B, FK4C and FV4A ICM2 Motor
21
OPTIONAL SAFETY GROUND
1 2 3
POWER CONNECTOR
9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8
CONTROL CONNECTOR
COOLING MODE—SINGLE SPEED OR 2-SPEED HIGH
Thermostat closes circuits R to Y/Y2 and R to O (heat pump only)
for single speed. A circuit from R to Y1 is also required for
2-speed high. The Y/Y2 signal is sent directly to ICM2.
COOLING MODE—TWO-SPEED LOW
Thermostat closes circuits R to Y1 and R to O (heat pump only).
The Y1 signal is sent directly to ICM2.
ELECTRIC HEAT HEATING MODE
Thermostat closes circuit R to W2, W3, or E.
The terminal block positions W2, W3, and E are tied together by
jumpers JW1 and JW2. These jumpers are provided for field
staging of electric heater banks through use of thermostats. When
staging is a requirement, installer cuts jumpers and wires in
thermostats as is the common practice with other fan coils. To
ensure motor operation if any 1 of the inputs is energized, the 3
electric heater inputs are also interlocked through diodes D1, D2,
and D3 to motor W input.
HEAT PUMP HEATING MODE—SINGLE SPEED OR
2-SPEED HIGH
Thermostat closes circuit R to Y/Y2 for single speed. A circuit
from R to Y1 is also required for 2-speed high. The Y/Y2 signal
is sent directly to ICM2.
4 5
A94079