8Field wiring
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WARNING
NOTICE
CAUTION
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 the water heater must be replaced, use only type 105°C wire or equivalent.
The water heater must be electrically grounded as required by National Electrical Code ANSI/NFPA 70 – latest edition.
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
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.
Power cord connection
This water heater is designed to operate with 120 VAC and 60 Hz power supply. If allowed by local codes, connect the power cord provided with the heater to a GFI protected outlet on a separate circuit and breaker. Ensure the circuit cannot be interrupted by a switch used to control lights or other appliances.
If local codes do not allow for the use of the power cord, remove the cord from the junction box found on the side of the control support bracket (FIG.
Low voltage connections
1.Route all low voltage wires through the knockouts in the rear of the water heater, as shown in FIG.
2.Connect low voltage wiring to low voltage connection board as shown in FIG.
Figure 8-1 Routing Field Wiring
LOW VOLTAGE
WIRING KNOCKOUTS
WARNING Use of an extension cord is NOT allowed. If a suitable electrical outlet is not within reach
of the supplied power cord, a new receptacle must be installed or the power cord must be replaced with hard conduit as described above.
Figure 8-2 Remove Power Cable
JUNCTION BOX
Runtime contacts
The electronic control closes a set of dry contacts whenever the burner is running. This is typically used by Building Management Systems to verify that the water heater is responding to a call for heat.
Auxiliary device proving switch
1.When the operation of an external limit needs to be verified before the water heater fires, remove the jumper wire from terminals X & B and connect them to the contacts on the external limit (FIG.
Alarm contacts
The electronic control closes another set of contacts whenever the water heater is locked out or the power is turned off. This can be used to turn on an alarm, or signal a Building Management System that the water heater is down. Note that the alarm contacts will close momentarily after each call for
heat.
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