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8
Field wiring
ELECTRICAL SHOCK HAZARD – For
WARNING
⚠
your 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.
Label all wires prior to disconnection
CAUTION
⚠
when servicing controls. Wiring errors
can cause improper and dangerous
operation.
Figure 8-1 Line Voltage Field Wiring Connections
120V SUPPLY
NEUTRAL
W
GROUND
G
LINE
BK
SERVICE
SWITCH
BK
SYSTEM
G
PUMP
W
BK
BOILER
G
PUMP
W
BK
DOMESTIC
G
HOT WATER
W
PUMP
L2/N G
L1
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.
46
Installation & Operation Manual
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. When connecting a domestic hot water (DHW) pump,
connect the wiring to the line voltage terminal strip as
shown in FIG. 8-1.
4. To activate a system pump, wire as shown in FIG. 8-1. Dry
contacts are sized for 1.5 hp/120V, 3 hp/240V or 30 amps.
Low voltage connections
1. Route all low voltage wires through the knockouts in the
rear of the boiler, as shown in FIG. 8-2.
2. Continue to route the wires through the plastic bushings to
the left of the low voltage connection board.
3. Connect low voltage wiring to the low voltage connection
board as shown in FIG. 8-3 on page 55 of this manual and
the boiler wiring diagram. Make certain the wires will stay
well away from the top of the heat exchanger.
Figure 8-2 Routing Field Wiring
LOW VOLTAGE
CONNECTION
BOARD
LINE VOLTAGE
JUNCTION BOX
Thermostat
1. Connect the room thermostats or end switches (isolated
contact only) to heat/loop demand 1, 2, or 3, as shown in
FIG. 8-3.
2. Install the thermostat on the inside wall away from
influences of drafts, hot or cold water pipes, lighting
fixtures, television, sunlight, or fireplaces.
3. Thermostat anticipator (if applicable):
a.
If connected directly to boiler, set for 0.1 amps.
b.
If connected to relays or other devices, set to match
total electrical power requirements of connected
devices. See device manufacturers' specifications
and thermostat instructions for details.
LOW VOLTAGE
WIRING KNOCKOUTS
LINE VOLTAGE
WIRING KNOCKOUTS
IMG01008
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