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GALAXY
21
WIRING DIAGRAMS FOR STEAM BOILERS WITH INPUT OF 300,000 BTU/HR
MODELS WITH CONTINUOUS PILOT AND OPTIONAL VENT DAMPER
CAUTION: Label all wires prior to disconnection when servicing control.
Wiring errors can cause improper and dangerous operation. “Verify proper operation after servicing.”
STEAM (PZ) BOILER WITH
CONTINUOUS PLOT,OPTIONAL VENT DAMPER AND ELECTRONIC
L.W.C.O.
BOILERS WITH 300,000 BTU/HR INPUT
WARNING:
BLOCKED VENT SAFETY SWITCH MUST BE MOUNTED TO DRAFT HOOD BEFORE
OPERATING THE BOILER (SEE INSTRUCTION MANUAL GG-40)
BEFORE INSTALLING VENT DAMPER , READ WARNING LABEL ON THIS
BOILER AND VENT DAMPER. READ SLANT/FIN VENT DAMPER
INSTALLATION INSTRUCTIONS.
OPTIONAL VENT DAMPER
SLANT/FIN
VENT DAMPER
1
4
2
2
VENT DAMPER
HARNESS SUPPLIED
WITH VENT DAMPER
WHITE
BLACK
WHT/YEL
BLK/YEL
1
FLEX METALLIC CONDUIT
3
3
4
RED
1
2
1
2
RECECPTACLE A
4
3
4
MALE PLUG
RED
BLUE
YELLOW
VIOLET
RECEPTACLE B(CONNECTS TO
MALE PLUG ON ADAPTER
HARNESS)
3
P
ROLL-OUT
SWITCH
RED
CABLE
WHITE NEUTRAL
N
TH-TR
24V
GAS
VALVE
P
24V
120V
1
BLK. HOT
H
TR
TH
P
EMERGENCY
SWITCH
BLOCKED VENT
SAFETY SWITCH
P
RED
VIOLET
WHITE
BLUE
*
ELECTRONIC
L.W.C.O.
THERMOSTAT
PLUG
SCREW TERMINALS
2
A
N
H
PROBE
C
W
H N B
2 P2
1
RECEPTACLE
B
JUMPER
2
3
1
ALARM OR
WATER FEEDER
(IF USED)
WIRE NUT
PRESSURE CUT-OUT
: FOR McDONNNELL & MILLER L.W.C.O. (PS-802-24)
AND WATER FEEDER WF-2-U-24 ONLY
HOT
BLK
NEUTRAL
WHITE
EMERGENCY
SWITCH
1
120V
L1
L2
24V
1
H
2 N
L.W.C.O.
P2
PRESSURE
*
THERMOSTAT
B
CUT-OUT
A
W
2
N
GAS
VALVE
H
TH
TR
ROLL-OUT
SWITCH
1
2
3
ALARM OR
WATER FEEDER
(IF USED)
4
3
BLOCKED VENT
SAFETY SWITCH
SLANT/FIN
VENT DAMPER
TERMINALS MARKING SHOWN
ARE FOR BOILER HARNESS
MALE PLUG.
1
2
: FOR McDONNNELL & MILLER L.W.C.O. (PS-802-24)
AND WATER FEEDER WF-2-U-24 ONLY
WIRE LEGEND
FACTORY WIRED
FIELD CONNECTED
FACTORY SUPPLIED
FIELD CONNECTED
FIELD SUPPLIED
4
2
1
3
PLUG
2
4
WIRE ENTRANCE
ENDS POLARIZED
3 CONNECTORS
RECEPTACLE
1
PROVIDE DISCONNECT MEANS & OVERLOAD PROTECTION
1 AS REQUIRED.
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE
APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED WITH
TYPE 105˚ C OR ITS EQUIVALENT.
IF THE WIRES MARKED( P ) MUST BE REPLACED,THEY MUST BE
REPLACED WITH POWER LIMITED FIRE PROTECTIVE CABLE.
* TERMINALS MARKING SHOWN IN CIRCLES ARE FOR McDONNELL & MILLER
L.W.C.O., THOSE NOT IN CIRCLES ARE FOR HYDROLEVEL (SAFGARD)
CONTACTS SHOWN WHEN BOILER WATER IS AT NORMAL LEVEL.
GALAXY
41-1263 A