50
8 Field wiring
ELECTRICAL SHOCK HAZARD – For
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.
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.
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. 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.
DOMESTIC
HOT WATER
PUMP
BOILER
PUMP
SYSTEM
PUMP
120V SUPPLY
LINE
GROUND
NEUTRAL
W
G
BK
SERVICE
SWITCH
L2/N GL1
BK
G
W
BK
G
W
BK
G
W
Figure 8-1 Line Voltage Field Wiring Connections
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation.
WARNING
NOTICE
CAUTION
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. Connect low voltage wiring to the low voltage connection
board as shown in FIG. 8-3 on page 53 of this manual and
the boiler wiring diagram.
LOW VOLTAGE
CONNECTION BOARD
LOW VOLTAGE
WIRING KNOCKOUTS
LINE VOLTAGE
WIRING KNOCKOUTS
LINE VOLTAGE
JUNCTION BO
X
Figure 8-2 Routing Field Wiring
Installation & Operation Manual