UNIT SERVICE
HCV & HCVR Evaporative Cooling & Gas Heating
Page 19 of 26
H
EATING
S
ECTION
The frequency with which maintenance must be carried out will depend upon installation conditions and
heater usage. It is recommended that an annual inspection of flue tubes and burners be carried out by a
qualified serviceman. As soot or dirt will prevent proper combustion, the serviceman should look for such
things as evidence of blocked burner ports, heavy ash or soot deposits or irregular flame shape. Any of
these signs can be a warning of improper combustion, lowered efficiency and decreased reliability:-
Clean and Service
Should a full “clean out service” be necessary, the procedure is as follows:
1.
Shut down appliance as per procedure on data plate and switch off power supply at isolator.
2.
Remove front lower access panel to give clear access to burner chamber.
3.
Remove radiation shield/s from under burner bed/s (when fitted).
4.
Remove the pilot/s and burner bars.
5.
Remove flue pipe from unit.
6.
Remove draft diverter as follows:
a)
Remove front upper access panel.
b)
Remove sheet metal screws at rear of draft diverter and lift about 50mm, slide slightly towards the
rear to remove from offset at front.
7.
Lift internal baffle assemblies from flue tubes.
8.
Clean baffle and inner surface of flue tubes thoroughly. A 38 or 44mm diameter wire brush with a long
handle is recommended.
9.
Remove dirt from bottom tray.
Remove Pilot Assembly and Burner Bars
1.
Uncouple pilot gas pipe from the pilot burner/s.
2.
Pilot assembly can be removed by two 4mm screws
3.
Remove the burner tube to which the pilot is attached by sliding the burner bar sufficiently towards the
front of the heater to allow the round end of the burner to disengage – age from the manifold plate.
Lower the end of the burner and remove from rear location plate.
Remove Main Burner Bars
Remove all burners as describe above. Lightly brush away any deposits from burners and inspect for
damaged or blocked ports.
Cleaning burners
1.
Pilot Burner:
1.1.
Wipe off any carbon deposits from flame rod on ignition electrode. Inspect for erosion and if faulty
replace.
1.2.
Check burner assembly and remove any lint deposits etc with a small brush.
1.3.
If pilot burner is block, remove small c clip on pilot assembly to drop injector holder. Clean
injector hole.
1.4.
Reassemble burner.
2.
Main Burners:
2.1.
Remove ribbon retaining split pin and carefully pry ribbon from slot.
2.2.
Clean ribbon.
2.3.
Replace ribbon and pin.
2.4.
Replace burner, ensuring that they are properly seated.
