COMBAT CUHA - Heater Operation; Automatic Ignition Burner; Manual Ignition; Common Operation - All Heater Types

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UNIT HEATER
1.2 Heater Operation
1.2.1 Automatic Ignition Burner
Combat CUH.../A range warm air heaters are fitted with an automatic ignition control which ignites
the gas and monitors for the safe operation of the burner each time the external controls call for the
heater to operate.
1.2.2 Manual Ignition
Combat CUH... range heaters are fitted with a permanent pilot which requires manual ignition. Once
ignited the pilot remains alight so long as the thermocouple is detecting a flame. i.e. the multifunctional
control or isolating gas valve is not turned off and the electrical power supply is not interrupted.
1.2.3 Common Operation - All Heater Types
When the external controls call for heat, the burner operates to supply heat to the heat exchanger. After
approximately 2 or 3 minutes the air delivery fan will start to run, supplying warm air to the building.
When the external controls are satisfied they will turn off the burner leaving the fan running to cool
down the heat exchanger. When cool enough the fan thermostat will turn off the fan.
Note: For CUHD... versions supplied without a fan, for installation in ducting with a customer supplied
fan unit, it is essential that the control of the fan incorporates a system for allowing the fan to run on at
close down of the burner as described above.
WARNING
The electrical isolator should only be used in an emergency and should not be used for
closing down the burner, as this switches off the fan prematurely and may damage the heat
exchanger invalidating the warranty and causing a potential fire hazard.
Operating the electrical isolator on a CUH... manual ignition heater will also
turn off the pilot burner.