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Wiring
Gas Heaters with 200–1000 MBh Output
Single-phase 120, 208, 230, 460 or 575 volt power is
required to operate the heater controls or power the
transformer (TRANS1), if provided.
Single-phase power for 208, 230 460 and 575 voltage is
provided for the gas heat off two legs of the three-phase
supply to the air-handling unit. A transformer in the piping
vestibule is provided to step down the voltage required for
gas heat.
Gas Heaters with 1250–2400 MBh Output
Three-phase 208, 230, 460 or 575 volt power is required to
operate the exhaust fan and power the transformer
(TRANS1).
20
Low-Voltage Wiring
NOTICE
Equipment Damage!
The gas heat system will not operate without a supply
fan providing airflow. Operating the gas heat system
without a supply fan could result in damage to
equipment or property.
The gas heat control system requires a binary signal for
on/off control. Provide an interlock in the start-stop signal
circuit with the air handler supply fan. This interlock must
insure the start-stop signal is interrupted to the gas heat
system if the supply fan is shut off. The gas heat system
must not operate without the supply fan providing airflow.
The control system also requires a 2 to 10 Vdc analog
signal for modulation where 10 Vdc is a signal for full heat.
A 4 to 20 mA interface module is available.
CLCH-SVX08C-EN
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