Use and Care Manual

15
Phase III
®
Wiring Requirements
Electrical shock hazard can cause severe
personal injury, death or substantial prop-
erty damage. Disconnect power before
installing and/or servicing.
1. All wiring must be a minimum of 18 gauge
and installed in accordance with:
• U.S.A. - National Electrical Code and any
other national, state or local code require-
ments having jurisdiction.
• Canada - C.S.A. C22.1 Canadian Electrical
Code Part 1 and any other national, provin-
cial and local code requirements having
jurisdiction.
2. If original wire supplied with appliance must
be replaced, Type 90ºC or its equivalent must
be used.
3. Refer to control component instructions
packed with boiler for application information.
4. An optional service switch may be installed in
water heater electrical circuit. This switch
would only shut off the water heater, not the
home heating system. Do not shut off water
heater if there is a chance of freezing.
5. All electrical contacts shown do not have
power applied - off the shelf condition. See
pages 16 thru 19.
Circulators
• Priority relay must be sized for total amp draw
of all circulators.
Zone Valves
•Transformer must be sized for maximum load
of all zone valves.
Snap Set Connection
• For easy wiring between water thermostat and
boiler controls see Installation Wiring section
pages 16 through 19.
• Make sure snap set is firmly snapped together
after wiring.
WARNING
Snap Set Wiring
Connect to 
outer 2 terminals
Installation