5-3
SECTION 5 TROUBLE-SHOOTING
Figure 5-1 Wiring Diagram Mechanical Controls, Model ST-12
TO FRONT
FRAME GRD
STUD
50
TO FRONT
FRAME GRD
STUD
50
BUZZER
B1
(UPPER)
PILOT-LIGHT
A
A
B
B
5
6
105
LT1
GRN
2
1
106
7
9
11
A
TIMER
21
24 DONE
RUN
22
B
12
ON
55
53
3
8
10
34
WHT
STEAM SOL.
VALVE V3
THERMOSTAT
SWITCH S3
COLD WATER
CONDENSER
V1
REED SWITCH
S1
CONNECTOR
WHT
36
RELAY R1
31
WHT
WHT
WHT
47
BLK
BLK
BLK
BLK
5
27
59
5
60
13
14
56
56
55
11
11
12
12
1
1
29
60
51
9
28
9
14
101
102
59
33
13
51
30
2
9
3
2
9
3
4
1
2
3
7
8
10
9
6
5
4
TIMER
TB1
60 MIN. TIMER
TMR1 (UPPER)
A
B
A
B
A
B
A
B
11
48
47
186
BLK
EXISTING
WIRES
BOILER CONTROL BOX
(AUTOMATIC BOILERS)
TO 120/240V
SUPPLY BOX
TO 120/240V
SUPPLY BOX
TO 120/240V
SUPPLY BOX
L1
N
(OPTIONAL)
11
3
L1
8
8
P1
J1
10
10
7
7
6
6
32
49
184
185
4
4
5
5
N (L2)
NOTES:
1. ALL WIRES 18 AWG AND YELLOW EXCEPT WHERE INDICATED OTHERWISE.
2. FOR WIRE LEAD SCHEDULE REFER TO DRAWING C 91-6472.