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18
Electrical Wiring
The electrical power supply requirement for these boil-
ers is 120 VAC, 60 Hz. Field wiring connections and
electrical grounding must comply with the local codes,
or in the absence of local codes, with the latest edition
o
f the National Electrical Code, ANSI/NFPA 70.
Provide a separate fused circuit from the main electri-
cal panel to the boiler, and a disconnecting means
within sight of the boiler.
Remove the control box cover and make the power
supply connections in the field wiring compartment.
(See general location of controls drawing on page 28).
The pump is supplied and factory-wired to operate
with the boiler. The "TH" wire leads are for the room
thermostat or zone valve connections.
The room thermostat should be installed in accor-
dance with the manufacturer's instructions. The
thermostat heat anticipator should be set at 1.0
ampere (automatic ignition) and 0.60 ampere (stand-
ing pilot) for single- zone installations. For multi-zone
applications, the heat anticipator setting should be
based on the ampere load in the thermostat circuit.
NOTE: If it is necessary to replace any of the
original wiring, it must be replaced with 105°C wire or
its equivalent, except 150°C black wire must be
replaced with 150°C wire or its equivalent. See Fig.
19 for 150°C wire indication.