Carrier FA4ANF Service Manual page 10

INTERLOCK
DIODES
PLUG
TRANSFORMER
CONNECTIONS
2. AUX1 and AUX2 for 2-Speed Fan Relay Kit
a. Use to control fan speed operation, high speed for cooling,
heat pump, and fan-only modes. Low speed is used for
electric heat. Fig. 9 shows proper connection for 24-v dc
2-speed fan relay kit. Note that kit's relay coil is in parallel
with fan relay coil on PCB connected to AUX1 and AUX2.
Make sure the normally closed contact is connected to the
lower speed.
b. The latent capacity control kit is used to control fan speed
operation when the relative humidity is above a set point on
HK61GA001
2FC-1
HK61GA001A
3 2 1
6 5 4
9 8 7
12 11 10
TRANSFORMER
AC LINE
T1 T2 T3
COMMON DUMMY
240 VAC
Fig. 6—HK61GA001 Printed-Circuit Board
LOW VOLTAGE
TERMINAL BOARD
2ND STAGE
3RD STAGE
C
AUX1
24VDC
AUX2
F4
FAN
RELAY
F3
DUMMY
F2
DUMMY
L2 EAC2
FAN
F1
COMMON
L1 EAC1
240 VAC
ELECTRONIC AIR
CLEANER CONNECTIONS
humidistat. Humidistat opens and 2-speed fan relay re-
mains in normally closed position with fan motor running
at a lower speed for maximum humidity control. Fig. 10
shows proper connection for latent capacity control kit.
Note that it is connected in the same manner as 2-speed fan
relay kit but with relay connected to humidistat (orange
wires).
c. Time delay-off relay kit is used to increase the efficiency of
the system by delaying the fan from turning off after the
thermostat is satisfied on the HK61GA001 board. The
10
ELECTRIC HEAT
BREAKOFF TABS
FOR STAGING
NOT USED
FUSE
(LOW VOLTAGE)
CONNECTIONS
FOR VARIOUS
ACCESSORIES
FAN CONNECTIONS
A97025