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UNIT HEATER
9.6 Lighting Instructions for Manual Ignition Heaters
Types CUHA, CUHB,CUHC and CUHD
(See 9.4. for lighting automatic ignition heaters)
9.6.1
Ensure that the electrical and gas supplies to the heater are on.
Check that the remote controls are set to “OFF”.
All CUH manual ignition unit heaters are controlled by an S.I.T Nova 0.820.045 multifunctional gas
valve (see Fig 9.1).
TO LIGHT PILOT
To ignite the pilot press in the manual control button of the gas valve and turn anticlockwise to the star
symbol.
Press the button fully in and hold whilst continuously pressing and releasing the Piezo ignition device
to create the spark ignition.
Note: IF AT ANY TIME THE PILOT FAILS TO LIGHT OR GOES OUT, EITHER
INTENTIONALLY OR UNINTENTIONALLY, WAIT A FULL 3 MINUTES BEFORE
ATTEMPTING TO RELIGHT.
Once the pilot flame has been seen to light (visible through the rear panel of the heater near to the gas
pipe to the burner) continue to hold in the control valve button for a further 30 seconds, and then
release.The pilot flame should now remain on.
Should the pilot flame go out check that the limit thermostats have not operated and that there is an
electrical supply to the main terminal block.
Also ensure that the leads to the thermocouple interrupter relay are connected to their connections on
the gas valve (see Fig 4.3).
Observe the 3 minute waiting time and retry.
Once the pilot flame has been established it will remain on constantly providing that the gas or electricity
supplies are not interrupted and the limit thermostats do not operate.
To Operate The Main Burner
Press in slightly and turn the valve control knob a further quarter turn anticlockwise to the "flame"
symbol.
Operate the remote controls to ON ensuring that the thermostat is set to the required temperature,
(which must be above the ambient temperature for the heater to operate).
The main burner will now operate automatically providing that the pilot flame remains alight.
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.
Interrupting the electrical supply also turns off the pilot flame.
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