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UNIT HEATER
Section 9. USER INSTRUCTIONS
The CUHA/A, CUHB/A, CUHC/A & CUHD/A ranges of heaters are fully automatic and operate
from the remote controls fitted on site.
The only user controls situated on the heater are:
The burner lockout reset button See 9.3.1
The fan run button See 9.2.1
The limit thermostat reset See 9.2.1
The second limit thermostat reset button See 9.2.2
(there are two of these on the models 340 & 380)
The CUHA, CUHB, CUHC & CUHD ranges of heaters are manual ignition of the pilot, but operate
automatically from the remote controls fitted on site providing that the pilot flame remains alight.
The user controls on these heaters are:
The main gas valve controls for lighting the pilot and main burner see 9.6.1 and Fig 9.1
The fan run button see 9.2.1
The limit thermostat reset see 9.2.1
The second limit thermostat reset button see 9.2.2
(there are two of these on the models 340 & 380)
All heaters require a constant gas and electricity supply which must not be interrupted during the
normal operation.
9.1 Heater Operation
When the heater has been switched on by the remote controls installed on site (see Controls Instructions)
the main burner will automatically turn on to heat the heat exchanger.
For Automatic ignition heaters the burner control box will control the safe ignition of the pilot and
main flame.
For manual ignition the pilot flame must be manually ignited and constantly alight to enable the
remote controls to operate the main burner.
When the heat exchanger is sufficiently heated, the fan thermostat turns on the main fan(s) and warm
air is discharged from the front of the heater.
WARNING:
The electrical isolator must not be used for turning the heater off other than in an emergency.
This will prematurely turn off the distribution fan and will seriously shorten the life of the
heat exchanger, invalidating the warranty.
Such action may also cause a fire hazard.
For manual ignition models interrupting the electrical supply also turns off the pilot flame.
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