Diagrams - Lennox ZGB Series Unit Information

VIII-Wiring Diagrams and Sequence of Operation
COMPONENT
KEY
A2 ELECTRONIC SENSOR
A3 BURNER CONTROL BOARD
A6
SOLID STATE ENTHALPY CONTROL
A7
SOLID STATE ENTHALPY SENSOR
A63 CO2 SENSOR (IAQ)
B1 COMPRESSOR 1
B3 BLOWER MOTOR
B4 OUTDOOR FAN MOTOR
B6 COMBUSTION AIR BLOWER MOTOR
B7 ECONOMIZER OR DAMPER MOTOR
B10 EXHAUST FAN MOTOR
C1 OUTDOOR FAN CAPACITOR
CAPACITOR, COMB AIR BLOWER
C3
CAPACITOR, EXHAUST FAN 1
C6
C7 COMPRESSOR 1 HARD START CAPACITOR
C12 DUAL CAPACITOR
CMC3 TIME CLOCK
DL3 DELAY,GAS 2,180 SECONDS, 11,16
DL48 DELAY,CRANKCASE HEATER
DELAY,BLOWER OFF
DL49
DL50 DELAY,1.5 SEC DELAY ON MAKE
E1 SPARK
F1 TRANSFORMER 1 FUSE
FS1 FLAME SENSOR
GV GAS VALVE
HEATER, COMPRESSOR 1
HR1
K1 COMPRESSOR 1 CONTACTOR
K3 BLOWER CONTACTOR
K8E TRANSFER RELAY, ECONOMIZER
K10 OUTDOOR FAN RELAY
K31 HARD START RELAY
RELAY, BLOWER
K37
K65 EXHAUST FAN RELAY
K72 GAS 3 RELAY
K191 RELAY,CRANKCASE HEATER
K239 RELAY, Y1/W1 HI−LO SWITCHING RELAY
RELAY, Y2 HIGH SPEED BLOWER
K250
R1 MIXED AIR OR SUPPLY SENSOR
R2 MINIMUM POSITION POTENTIAMETER
R51 RESISTOR, MAT BYPASS
RT2 REMOTE THERMOSTAT SENSOR
SENSOR, OUTDOOR AIR TEMP
RT26
S3 LOW DISCHARGE TEMP LIMIT, COMPRESSOR 1
S4 HIGH PRESSURE LIMIT, COMPRESSOR 1
S5 HIGH TEMPERATURE LIMIT, COMPRESSOR 1
S10 PRIMARY GAS LIMIT SWITCH
S11 LOW AMBIENT LOW PRESSURE SWITCH
S18 COMBUSTION AIR BLOWER PROVING SWITCH
SWITCH−CRANKCASE HEATER T−STAT
S43 LOW GAS PRESSURE SWITCH
KEY LIST
S47 FLAME ROLLOUT SWITCH
THERMOSTAT OPEN −20F , CLOSE 10F
S59
S149 OVERFLOW SWITCH
SENSIBLE (55−70) TEMPERATURE THERMOSTAT
S175
T1 TRANSFORMER, CONTROL
T3 COMBUSTION AIR BLOWER TRANSFORMER
T10
EXHAUST FAN TRANSFORMER
Page 51
JACK/PLUG DESCRIPTION
J/P #
1 GAS LIMIT
2 HEAT
3 ECONOMIZER
4 ECONOMIZER
9 ECONOMIZER
18
EXHAUST FAN
19 COMBUSTION AIR BLOWER
21 COMBUSTION AIR BLOWER
24 EXHAUST FAN
29 GAS VALVE
39 CONTROL INTERFACE
349 DELAY TIMER POWER
350 BLOWER HIGH − LOW MECHANICAL SWITCHING JACK
351 BLOWER HIGH − LOW MECHANICAL SWITCHING JACK