Lennox LGH240H

Page 116
GAS HEAT DIAGRAM
NOTE - On single stage heat, terminal H1 on gas valve GV1 and GV3 is
not connected to terminal H2 on A55 Unit Controller.
2
4
7
11
12
4
4
5
15
11
12
5
15
10
7
11
11
13
13
7
11 12
13
11
12
13
11
12
13
3
6
3
6
15
10
New Form No.
Supersedes
WIRING DIAGRAM
GAS HEAT FOR LGH/SGC
169,260,360 AND 480
07/18
COOLING -MSAV NO BYPASS
SECTION B REV 0
537695-03
537695-04
BLACK
HI
COM
WHITE
T3
2
1
B6
C3
HR6
(2)
K125-1
7
4
J19
1
K13-1
7
4
P19
S99
J216
4
6
P216
J19
2
P19
J28
9
P28
BLACK
HI
COM
WHITE
T13
B15
C11
J21
1
K19-1
7
4
P21
J21
2
P21
HR6
K125-1
7
4
(1)
2
P28
J28
4
3
S69
3
KEY
DESCRIPTION
A3
CONTROL, BURNER 1
A12
CONTROL, BURNER 2
A55
PANEL, MAIN CONTROL LENNOX
B6
MOTOR COMBUSTION AIR BLOWER 1
B15
MOTOR COMBUSTION AIR BLOWER 2
C3 CAPACITOR, COMB AIR BLOWER 1
C11CAPACITOR, COMB AIR BLOWER 2
E1
SPARK
FS1 SENSOR, FLAME
GV1 VALVE, GAS 1
GV3VALVE, GAS 2
HR6
HEATER, −50C LOW AMBIENT KIT
K13,−1
RELAY, COMBUSTION AIR BLOWER 1
K19,−1
RELAY, COMBUSTION AIR BLOWER 2
K125,−1
RELAY, HEAT SHUT OFF
S10
SWITCH, LIMIT PRIMARY GAS
S18
SWITCH, COMB AIR BLOWER 1 PROOF
S45
SWITCH, COMB AIR BLOWER 2 PROOF
S47
SWITCH, FLAME ROLLOUT BURNER
S59
TSTAT, OPEN −20F, CLOSE 10F
S60
TSTAT, OPEN 20F, CLOSE −10F
S61
TSTAT, OPEN 50F, CLOSE 20F
S69
SWITCH, FLAME ROLLOUT 2
S99
SWITCH, LIMIT PRIMARY BURNER 2
T3
TRANSFORMER, COMB AIR BLOWER 1
1
2
3
2
3
4
5
6
9
8
10
COM
K19
B
2
A
1
1
A12,
K17
W2,
K18
H2
(24 VAC)
S99 - C
S100-NC
S69
S99 - NC
S99 - NO
S100 - C
S69
S45
GV3
S45
CAB
3
A178
5
K13
A
B
E1
FS1
GND
CAB
2
3
4
5
6
7
9
8
10
1
(24 VAC)
S10 - C
2
1
3
COM
A3,
K15
W2,
K16
K13
H2
A55
J265D
8
P265
GV1
S18
P15
J15
4
3
K19
A
B
8
J15
9
7
GV3
S10
J216
1
3
P216
2
E1
FS1
GND
8
7
A12
J28
5
P28
A3
J15
5
P15
3
K125
A
B
S60
S61
S60
S61
(2)
K125
A
B
P229
J229
4
P230
J230
4
P229
J229
P230
J230
P229
J229
2
P230
J230
2
P229
J229
1
P230
J230
1
S59 (1)
J229
6
P229
P229
J229
5
S59 (2)
J230
6
P230
P230
J230
5
P228
J228
1
P228
J228
22 1
(1)
DESCRIPTION
A178
PANEL, COMP 3 & 4 , 2nd STAGE HEAT− C3
15 BURNER 1
19 COMBUSTION AIR BLOWER 1
21 COMBUSTION AIR BLOWER 2
28 BURNER 2
216 PRIMARY LIMIT 1
228
VESTIBULE HEATER
229
VESTIBULE HEATER CONTROL 1
230
VESTIBULE HEATER CONTROL 2
265
CONTACTOR RELAY
266
HEATING CONTROL STG 1
271
HEATING SENSORS STG 1
272
HEATING SENSORS STG 2
J/P
DESCRIPTION
S45
332
HEATING CONTROL STG 2
T13
TRANSFORMER, COMB AIR BLOWER 2
S47
J29
1
2
J29
3
J30
1
2
J30
3
4
4
29 GAS 1 HONEY WELL VALVE
30 GAS 2 HONEY WELL VALVE
4
24VAC
A55
24V COMMON
GND
FROM F10
F10 USED ON 240H/300S Y VOLTS, ULTRA Y
VOLT UNIT AND ALL NON ULTRA UNITS WITH
SCCR OPTIONS
F10
FUSE, OUTDOOR FAN MOTOR
1
T3 AND T13 NOT CONNECT TO F10 ON 575V
SCCR UNITS