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41Part number 550-141-850/0699
• Installation • Start-Up • Parts • Maintenance
Field wiring
Factory wiring
Service
switch
(not provided)
Junction box,
boiler left side
Thermostat
leads, through
jacket left side
Service
switch
(not provided)
Thermostat
or end switch
(not provided)
Thermostat
or end switch
(not provided)
Black White Green
Ground screw Wire nuts
Black Black
120 VAC
Hot Neutral
Ground
85028
Figure 18 Field wiring connections — service switch and thermostat (or end switch) provided by installer
For your safety, turn off electrical power supply at
service entrance panel before making any
electrical connections
to avoid possible electric shock
hazard. Failure to do so can cause severe personal injury
or death.
Watch polarity of the circuit when connecting the 120
VAC power wiring. If the polarity is switched, the boiler
control module will lockout. The control module will
flash the POWER light to indicate this problem. See
Troubleshooting, manual Section XI.
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.