Ambirad DR 120 Informações para o utilizador, instruções de instalação e de manutenção - Página 8

Procurar online ou descarregar pdf Informações para o utilizador, instruções de instalação e de manutenção para Aquecedor a gás Ambirad DR 120. Ambirad DR 120 15 páginas. Radiant gas heaters

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SERVICING
WARNING
DO NOT TOUCH THE IGNITION OR FLAME DETECTION ELECTRODES OR ANY PART OF THE IGNITION/
FLAME DETECTION CIRCUIT WHILE POWER IS CONNECTED TO THE HEATER. THESE PARTS CARRY
HIGH VOLTAGES AT ALL TIMES AND WILL GIVE AN ELECTRIC SHOCK IF TOUCHED.
Annual maintenance is normally sufficient unless abnormal site conditions necessitate that such work be carried
out at more frequent intervals e.g. dusty environment etc.
The procedure outlined below should be followed: -
1)
Turn OFF electrical isolating switch and gas cock.
2)
Remove dirt and other deposits from all heater surfaces. Low pressure compressed air may be used to clean
ceramic plaques and venturies. The air hose pressure should not exceed 200 kPa or 30psi.
3)
Remove and clean injectors, if necessary, using an 11mm spanner.
4)
Check that :-
all ceramic plaques are free from cracks or other damage.
the heater fixing arrangements are satisfactory.
the flue products outlet is free of obstructions.
the minimum clearances between the various heater surfaces and combustible materials are preserved.
5)
Re-commission heater as outlined in section on commissioning.
6)
Switch OFF the heaters. Close gas service cock if heaters are not to be used for an extended period.
TROUBLE-SHOOTING
1 )
Power is connected to the heater but nothing happens.
Remedy:
Check electrical supply and all electrical connections. If this reveals nothing, it is likely that the gas controller has
failed. Replace controller.
2)
The electrode sparks but the heater fails to ignite.
Remedy :
Check the heater inlet gas pressure (test point on gas valve). This should be at least 18mbar for natural gas or
30mbar for propane.
Check electrode spacing (recommended gap = 3mm)
Check operation of gas valve. Replace if necessary.
Replace controller if the valve is not defective.
3)
The heater ignites satisfactorily but switches off after a short period.
Remedy :
Check electrode spacing (recommended gap = 3mm, 3mm clearance should also be maintained to the surface of
the ceramic plaques.)
If this does not resolve the problem, replace controller.
4)
A burner does not reach its normal operating temperature (orange colour) and a loud roaring noise is
audible.
Remedy :
This indicates that the bumer has flashed back. The condition is caused by damage to the ceramic plaques.
Replace the affected burner unit.
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