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Installation and
Service Manual
41
OPERATION
FOR YOUR SAFETY READ BEFORE
OPERATING
A. This appliance does not have a pilot. It is equipped with an
ignition device which automatically lights the burner. Do
not try to light the burner by hand.
B. BEFORE OPERATING, smell around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle to the floor.
CONTINUOUS
1C 1NO 2C 2NO 3C 3NO 4C 4NO
A1 A2 A3 B1 B2 B3
INTERMITTENT
STAGE 4STAGE 1
HeatDem1
STAGE 2 STAGE 3
HeatDem2
STAGE 3
STAGE 4
STAGE 2
STAGE 1
Figure 42E
4 STAGE (High/Low Fire) BOILER OR WATER HEATER
FIELD CONNECTIONS
CONTINUOUSLY
MONITORED
INTERMITTENTLY
MONITORED
HIGH/LOW GAS, AUX. HI-LIMIT
AUX. LIMITS, EXT. FLOW SWITCH
EXAMPLE DEVICES:
CONTINUOUS
1C 1NO 2C 2NO 3C 3NO 4C 4NO
A1 A2 A3 B1 B2 B3
INTERMITTENT
STAGE 4STAGE 1
HeatDem1
STAGE 2 STAGE 3
HeatDem2
COM
OK
FAIL
COM
OK
FAIL
Figure 42F
FIELD INSTALLED SAFETY DEVICES
CONTINUOUS
1C 1NO 2C 2NO 3C 3NO 4C 4NO
A1 A2 A3 B1 B2 B3
INTERMITTENT
STAGE 4STAGE 1
HeatDem1
STAGE 2 STAGE 3
HeatDem2
Remote On/Off
Figure 42B
Field Provided Jumper Wire
Required for Mode 3 Operation
Remove Factory Jumper
if Jumper Wire is Added.
REMOTE ON/OFF BOILER OR WATER HEATER
Priority or O.A.
Lockout Override
CONTINUOUS
1C 1NO 2C 2NO 3C 3NO 4C 4NO
A1 A2 A3 B1 B2 B3
INTERMITTENT
STAGE 4STAGE 1
HeatDem1
STAGE 2 STAGE 3
HeatDem2
(Optional)
Remote On/Off
Figure 42C
BOILER WITH DOMESTIC HOT WATER PRIORITY OR I/O RESET OVERRIDE
FIELD CONNECTIONS
CONTINUOUS
1C 1NO 2C 2NO 3C 3NO 4C 4NO
A1 A2 A3 B1 B2 B3
INTERMITTENT
STAGE 4STAGE 1
HeatDem1
STAGE 2 STAGE 3
HeatDem2
STAGE 2
STAGE 1
Figure 42D
2 STAGE (High/Low Fire) BOILER OR WATER HEATER
FIELD CONNECTIONS