Install Instructions

43
7 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 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.
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 (15 amp recommended). 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. 7-2) and attach conduit to the junction
box. Route the wires out of the appliance to a GFI protected
outlet on a separate circuit and breaker (15 amp recommended).
Label all wires prior to disconnection
when servicing controls. Wiring errors can
cause improper and dangerous operation.
 WARNING
NOTICE
 CAUTION
IMG00480
LOW VOLTAGE
WIRING
KNOCKOUTS
Figure 7-1 Routing Field Wiring
Enable switch
An external switch or contact may be used to enable/disable
the water heater. To connect the enable switch, remove the
jumper wire from across the ENABLE terminals on the low
voltage connection board and connect the wires from the
switch in its place. Note that the freeze protection feature
will still fire the heater even though the enable input is open.
Louver relay output / louver proving
switch input
When installed using the optional room air configuration,
the heater is able to control powered louvers used to allow
outside air into the room. Connect the 24VAC control
relay coil to the LOUVER RELAY output on the low voltage
connection board. Remove the jumper wire from the
LOUVER PROVING SWITCH terminals on the low voltage
connection board and connect the louver proving switch
wires in its place.
Low voltage connections
1. Route all low voltage wires through the knockouts in the
top of the water heater, as shown in FIG. 7-1.
2. Connect low voltage wiring to low voltage connection
board as shown in FIG. 7-3 on page 44 of this manual and
the water heater wiring diagram.
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.
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.
Installation & Service Manual
JUNCTION BOX
IMG00482
MODELS: 126-100 -- 201-100
MODELS: 286-125 -- 501-125
JUNCTION BOX
POWER
CORD
POWER CORD
Figure 7-2 Remove Power Cord
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.
 WARNING