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VIII-Wiring Diagrams and Sequence of Operation
KEY LIST
SWITCH−CRANKCASE HEATER T−STAT
PRIMARY GAS LIMIT SWITCHS10
COMPRESSOR 1 CONTACTORK1
BLOWER CONTACTOR
K3
K10
HEATER, COMPRESSOR 1
HR1
K31
R51
R1
K65
R2
S3
S4
S5
S11
A2 ELECTRONIC SENSOR
C1 OUTDOOR FAN CAPACITOR
COMPRESSOR 1B1
BLOWER MOTORB3
OUTDOOR FAN MOTORB4
EXHAUST FAN MOTORB10
ECONOMIZER OR DAMPER MOTORB7
A6
A7
A63
C7 COMPRESSOR 1 HARD START CAPACITOR
C12
CMC3
FLAME SENSORFS1
F1
S18
A3 BURNER CONTROL BOARD
B6
C3
CAPACITOR, COMB AIR BLOWER
E1
GAS VALVEGV
K72
SOLID STATE ENTHALPY CONTROL
SOLID STATE ENTHALPY SENSOR
CO2 SENSOR (IAQ)
J/P #
JACK/PLUG DESCRIPTION
2
GAS LIMIT
3
4
9
1
19
HEAT
ECONOMIZER
ECONOMIZER
ECONOMIZER
EXHAUST FAN
COMBUSTION AIR BLOWER
COMBUSTION AIR BLOWER 21
EXHAUST FAN
24
GAS VALVE
29
CONTROL INTERFACE
39
18
DUAL CAPACITOR
OUTDOOR FAN RELAY
TIME CLOCK
TRANSFORMER 1 FUSE
HARD START RELAY
RESISTOR, MAT BYPASS
MIXED AIR OR SUPPLY SENSOR
MINIMUM POSITION POTENTIAMETER
EXHAUST FAN RELAY
LOW DISCHARGE TEMP LIMIT, COMPRESSOR 1
HIGH PRESSURE LIMIT, COMPRESSOR 1
HIGH TEMPERATURE LIMIT, COMPRESSOR 1
LOW AMBIENT LOW PRESSURE SWITCH
COMBUSTION AIR BLOWER MOTOR
SPARK
GAS 3 RELAY
COMBUSTION AIR BLOWER PROVING SWITCH
C6
CAPACITOR, EXHAUST FAN 1
K8E
TRANSFER RELAY, ECONOMIZER
RT2
REMOTE THERMOSTAT SENSOR
RT26
SENSOR, OUTDOOR AIR TEMP
DL48
DELAY, CRANKCASE HEATER
K191
RELAY, CRANKCASE HEATER
T3
TRANSFORMER, CONTROL
T1
T10
EXHAUST FAN TRANSFORMER
COMBUSTION AIR BLOWER TRANSFORMER
DELAY TIMER POWER 349
DL3
DELAY, GAS 2,180 SECONDS, 11 ,16
DL50
DELAY, 1.5 SEC DELAY ON MAKE
DL49
DELAY, BLOWER OFF
S47 FLAME ROLLOUT SWITCH
S59
S149
S175
OVERFLOW SWITCH
SENSIBLE (55−70) TEMPERATURE THERMOSTAT
THERMOSTAT OPEN −20F , CLOSE 10F
K37
RELAY, BLOWER
K250
RELAY, Y2 HIGH SPEED BLOWER
K239
RELAY, Y1/W1 HI−LO SWITCHING RELAY
BLOWER HIGH − LOW MECHANICAL SWITCHING JACK
350
BLOWER HIGH − LOW MECHANICAL SWITCHING JACK
351
LOW GAS PRESSURE SWITCH
S43
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