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Internal Wiring
Wire Color Code
Room T-Stat
Snap-Set
LWCO
Burner
Circulator
Relay R2
Relay R1
Transformer
Secondary T-Stat
Manual Reset
Safety Limit
Auto Reset
Safety Limit
Primary T-Stat
On-Off
Switch
C
2
1
Y
O
BL
G
T
T
T
T
B
BL
BL
BL
BL
B
B
B
B
R
V
W
G
W
Y
Y
Y
Y
P
P
V
V
V
B
C
B
B
B
B
BL
B
B
1
1
3
6
4
1
3
6
4
14
13 12
11
10
9
8
7
6
5
4
3
2
1G
G
G
B
G
G
120V Incoming
Supply Wiring
N
H
W
G
C
1
2
C
1
2
120V Field Wiring (by others)
120V Factory Wiring
24V Factory Wiring
Fig. 16: Factory Wiring Schematic