Bryant SM03-4 Service Manual page 10

FAN INTERLOCK
DIODES AND FAN
TIME DELAY OFF
CIRCUIT
PLUG
TRANSFORMER
CONNECTIONS
2. C is used to connect the brown wire of the thermostat to
provide a return path to ground through the fuse which
protects the transformer. C is fused on the HK61GA001
board.
3. G is used to control the switching of the relay to turn the fan
on through the normally open contact of the relay.
4. Y on the HK61GA001 is used as the junction for the
outdoor section's Y connection which controls the compres-
HK61GA003
Y
12 9 6 3
R
11 8 5 2
10 7 4 1
FAN
RELAY
T1 T2 T3 L2
COMMON DUMMY
L1
TRANSFORMER
AC LINE
240 VAC
Fig. 7—HK61GA003 Printed-Circuit Board
—10—
LOW VOLTAGE
TERMINAL BOARD
W3
2ND STAGE
L
ELECTRIC HEAT
BREAKOFF TABS
W2
FOR STAGING
O
3RD STAGE
E
Y
G
R
C
HK61GA003
AUX1
24VDC
AUX2
F4
F3
DUMMY
F2
DUMMY
EAC2
FAN
F1
EAC1 COMMON
240 VAC
ELECTRONIC AIR
CLEANER CONNECTIONS
sor contactor for heat pump and cooling modes. The
HK61GA003 board contains a 90-sec fan-off delay which
begins timing when the Y is de-energized.
5. O is used as a junction for a heat pump reversing valve
circuit.
FUSE
(LOW VOLTAGE)
CONNECTIONS
FOR VARIOUS
ACCESSORIES
FAN CONNECTIONS
A97026