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Part number 550-110-260/0200
33
Boiler Manual
Figure 20 Ladder wiring diagram
71033
1. All wiring must be installed in accordance with:
A. U.S.A. — N.E.C. And any other national, state,
or local code requirements.
B. Canada — C.S.A. C22.1 C.E.C. Part 1 and any
other national, provincial, or local code require-
ments.
2. Pilot lead wires are not field replaceable. Replace pi-
lot assembly if necessary.
3. If any of the original wire as supplied with the ap-
pliance must be replaced, use minimum 105 °C
wire or equivalent. Exception — wires to a rollout
TFE must be 200 °C or equivalent.
4. Thermostat anticipator setting (single zone) — see
Table G for anticipator setting, depending on
which gas valve is installed in boiler.
5. For multiple zoning, use either zone valves or
circulators. Refer to the component manufac-
turer's instructions and this manual for applica-
tion and wiring suggestions.
6. Refer to control component instructions packed
with the boiler for application information.
7. Wire any additional limit controls (low water cut-
off, additional high limit, etc.) in series with boiler
limit control as shown.
Honeywell VR8204
Honeywell VR8304
White-Rodgers 36E
White-Rodgers 36C
* Terminals 2–4 are factory-jumpered on the
White-Rodgers 36C gas valve.
MV/PV
MV/PV
2
2–4 *
MV
MV
1
1
PV
PV
3
3
Table G: Gas valve terminals and anticipator settings
Gas valve
"A" "B" "C"
Anticipator
amps
0.6
0.8
0.64
0.7
Electrical shock hazard — can cause
severe injury or death. Disconnect
power before installing or servicing.
All contacts are shown without power
applied.
SERVICE
SWITCH
THERMOSTAT
120 VAC
24 VAC
Control module
low voltage
section
CONTROL
MODULE
120 VAC
SECTION
Power
Tstat–Circ
Limit
Press switch
Flame
ROLLOUT
TFE
Additional
limits (note 7)
INDUCER MOTOR
CIRCULATOR
WATER TEMP
LIMIT SWITCH
PILOT GAS
VALVE
MAIN GAS
VALVE
AIR PRESSURE
SWITCH
PILOT
FLAME
SENSOR
PILOT
IGNITION
ELECTRODE
HIGH
VOLTAGE
HIGH
VOLTAGE
120 VAC
GndNeutralHot
See Table G
"A"
"C"
"B"
G
R
R
R
R
Legend for ladder wiring diagram
120 VAC factory wiring
High voltage spark ignition wiring
Low voltage factory wiring
Ground connectors
120 VAC field wiring
Low voltage field wiring