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CIRCUIT
BREAKER
WHITE
GROUND
BLACK
GREEN
ABC
Fig. 18: 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. 21-24.
Making the Electrical Connections
Refer to Fig. 18-26.
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. 19: Multi-meter
prior to working with any electrical connections or
components.
3. Observe proper wire colors while making electri-
cal connections. Many electronic controls are
polarity sensitive. Components damaged by
improper electrical installation are not covered by
warranty.
4. Provide overload protection and a disconnect
means for equipment serviceability as required by
local and state code.
5. Install heater controls, thermostats, or building
management systems in accordance with the
applicable manufacturers’ instructions.
6. Conduit should not be used as the earth ground.
Field Wiring Connection
NOTE: A grounding electrode conductor shall be
used to connect the equipment grounding
conductors, the equipment enclosures, and the
grounded service conductor to the grounding
electrode.
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause im-
proper and dangerous operation. Verify proper
operation after servicing.
Fig. 20: Wiring Location
NOTE: Minimum 18 AWG, 105°C, stranded wire
must be used for all low voltage (less than 30 volts)
external connections to the unit. Solid conductors
should not be used because they can cause
excessive tension on contact points. Install conduit
as appropriate. All high voltage wires must be the
same size (105°C, stranded wire) as the ones on the
unit or larger.