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.
BLACK CIRCUIT
BREAKER
WHITE
GREEN
GROUND
A B C
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
Fig. 19:
If the heater does not have a
To
Making the Electrical Connections
Refer to Fig.
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
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.
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.
Field Wiring Connection
Fig. 20: Wiring Location
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause im- proper and dangerous operation. Verify proper operation after servicing.
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