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Electrical Power Connections
Installations must follow these codes:
• National Electrical Code and any other national,
state, provincial or local codes or regulations hav-
ing jurisdiction.
• Safety wiring must be NEC Class 1.
• Heater must be electrically grounded as required
by the NEC.
• In Canada, CSA C22. 1 C.E.C. Part 1.
The heater is wired for 120 VAC, <12 amps. The volt-
age is indicated on the tie-in leads. Consult the wiring
diagram shipped with the heater in the instruction
packet. The remote tank control stat, thermostat, or
electronic heater control (as applicable) may be con-
nected to the stage selector terminal (See wiring
diagram). 24 VAC is supplied to this connection
through the heater transformer. DO NOT attach any
voltage to the stage selector terminals. Before
starting the heater check to ensure proper voltage to
the heater and pump.
Install a separate disconnect means for each load.
Use appropriately sized wire as defined by NEC, CSA
and/or local code. All primary wiring should be 125% of
minimum rating.
If any of the original wire as supplied with the heater
must be replaced, it must be replaced with 105°C wire
or its equivalent.
Field-Connected Controllers
It is strongly recommended that all individually-pow-
ered control modules and the heater should be
supplied from the same power source.
Check the Power Source
NOTE: Field-supplied isolation relays should be
installed when field-connected controllers are
mounted more than 50 equivalent feet (18 Ga) from
heater.
WARNING: Using a multi-meter, check the
following voltages at the terminal block inside the
unit. Make sure proper polarity is followed and house
ground is proven. (See Fig. 18.)
CIRCUIT
BREAKER
WHITE
GROUND
BLACK
GREEN
ABC
Fig. 16: Wiring Connections
Check the power source:
AC = 108 VAC Minimum, 132 VAC MAX
AB = 108 VAC Minimum, 132 VAC MAX
BC = <1 VAC Maximum
If the heater does not have a factory-wired stage con-
troller, it is factory-wired in an on-off configuration with
other stage terminals jumpered.
To field-connect a stage controller, remove factory-
installed jumpers and wire stage controller as shown in
Fig. 19–22.
Making the Electrical Connections
Refer to Fig. 16–22.
1. Verify that circuit breaker is properly sized by
referring to heater rating plate. A dedicated circuit
breaker should be provided.
2. Turn off all power to the heater. Verify that power
has been turned off by testing with a multi-meter
Fig. 17: Multi-meter
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