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8
Field wiring
ELECTRICAL SHOCK HAZARD – For your
⚠WARNING
safety, turn off electrical power supply before
making any electrical connections to avoid
possible electric shock hazard. Failure to do
so can cause severe personal injury or death.
Wiring must be N.E.C. Class 1.
NOTICE
If original wiring as supplied with boiler
must be replaced, use only type 105°C wire
or equivalent.
Boiler must be electrically grounded as
required by National Electrical Code ANSI/
NFPA 70 – latest edition.
This boiler is equipped with a feature that
NOTICE
saves energy by reducing the boiler water
temperature as the heating load decreases.
This feature is equipped with an override,
which is provided primarily to permit the use
of an external energy management system
that serves the same function. This override
MUST NOT be used unless at least one of the
following conditions is true:
1.
An
system is installed that reduces the
boiler water temperature as the heating
load decreases.
2.
This boiler is not used for any space
heating.
3.
This boiler is part of a modular or
multiple boiler system having a total
input of 300,000 Btuh/hr or greater.
4.
This boiler is equipped with a tankless
coil.
Figure 8-1 Line Voltage Field Wiring Connections
NEUTRAL
W
GROUND
G
120V SUPPLY
LINE
BK
SERVICE
SWITCH
WG BK
WG BK
BOILER
PUMP
WG BK
DOMESTIC
HOT WATER
PUMP
external
energy
management
DIR #2000507881 00
Installation & Operation Manual
Label all wires prior to disconnection
⚠CAUTION
when servicing controls. Wiring errors
can cause improper and dangerous
operation.
Installation must comply with:
1. National Electrical Code and any other national, state,
provincial, or local codes or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1,
and any local codes.
Line voltage connections
1. Connect 120 VAC power wiring to the line voltage
terminal strip in the junction box, as shown in FIG. 8-1.
2. Provide and install a fused disconnect or service switch
(15 amp recommended) as required by the code (see
FIG. 8-1).
3. The boiler pump is shipped loose. Wire the boiler
pump as shown in FIG. 8-1.
4. When connecting a domestic hot water (DHW) pump,
connect the wiring to the line voltage terminal strip as
shown in FIG. 8-1.
5. To activate a system pump, wire as shown in FIG. 8-1.
If the motor is larger than 1/8 hp or 1.8 amps, you must
isolate with a relay.
Low voltage connections
1. Route all low voltage wires through the knockouts on
the left side, as shown in FIG. 8-2.
2. Connect low voltage wiring to low voltage connection
board as shown in FIG. 8-3 on page 51 of this manual
and the boiler wiring diagram.
Figure 8-2 Routing Field Wiring
HIGH VOLTAGE
WIRING KNOCKOUTS
LOW VOLTAGE
CONNECTION BOARD
LOW VOLTAGE
WIRING KNOCKOUTS
DIR #2000507882 00
47
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