Lennox SCA Series - Page 21

Page 21
IMC BOARD INPUTS AND OUTPUTS
SCA240/SCB288
FIGURE 7
P110
P111
P112
P113
P114
P115
P116
SENSORS
INPUTS
OUTPUTS
COMPRESSOR
SAFETY INPUTS
BURNER
INPUTS
ROOM
THERMOSTAT
(A2)
A55
A56
A57
A60
120
A59
IMC AND ADD−ON BOARD LOCATION AND OPERATION
A55:
A56:
OPTIONAL
ECONOMIZ-
ER AND/OR
POWER EX-
HAUST FAN
A57
SECOND
COMPRESSOR
1 OUTDOOR FAN
A60:
SECOND ELEC-
TRIC
HEAT SECTION
A59 (SCA/SCB):
COMPRESSORS 3
AND 4, 2 OUT-
DOOR FANS
1 BLOWER
1 COMPRESSOR
1 OUTDOOR
FAN
1 ELECTRIC HEAT
SECTION
TB1 CONNECTS TO P110. ROOM THERMOSTAT CONNECTS TO TB1. SEE SEC-
TION C2 IN THE WIRING DIAGRAM SECTION P.65
A67
REHEAT CON-
TROL BOARD
UNDERNEATH
A60.