Connect Wiring
General wiring requirements:
Electric shock hazard. Can cause severe personal injury or death if
power source, including service switch on boiler, is not disconnected before installing or servicing.
•Installations must follow these codes:
—National Electrical Code, ANSI/NFPA 70, latest edition and any additional national, state or local codes.
—In Canada, CSA C22.1 Canadian Electrical Code Part 1 and any local codes.
•Wiring must be N.E.C. Class 1. If original wire as supplied with boiler must be replaced, type 105°C wire or equivalent must be used. Supply wiring to boiler and additional control wiring must be 14 ga. or heavier.
•Provide electrical ground at boiler as required by codes.
Thermostat wiring:
•Install thermostat on inside wall away from influences of drafts, hot or cold water pipes, lighting fixtures, television, sun rays or fireplaces.
•Follow instructions with thermostat. If it has a heat anticipator, set heat anticipator in thermostat to match power requirements of equipment connected to it. Boiler wiring diagrams give setting for standard equipment.
Junction box (furnished):
•Junction box houses electrical connections for all boiler components.
•“A” boilers are furnished with burner and limit harnesses.
•All
•Connect incoming line voltage “HOT” wire to service switch and neutral wire to white wire.
•Service switch (15 amp) is provided with boiler. “A” boilers — install switch as shown.
•Some local codes may require an emergency
Burner wiring:
•Burner harness incorporates a disconnect plug, providing a convenient way to disconnect wiring when burner mounting door is opened.
•On “A” boilers, mount the plug (provided in water trim carton) on the burner housing as shown in FIGURE 15. For Carlin burners, screw burner plug into threaded conduit coupling, then mount this assembly to the burner housing using the chase nipple. Route wires through housing and make connections in burner junction box as shown in boiler wiring diagram.
Tankless Heater Control |
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| Circulator Wiring Harness |
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Wiring Harness |
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(Furnished as part of tankless |
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heater kit as additional |
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| Limit Wiring Harness |
equipment from |
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Burner Wiring Harness 
Burner Disconnect Plug
Boiler Wiring for Forced Hot Water
FIGURE 15
18
