14
SECTION C - SERVICING
General Notes
Before removing the case to carry out any servicing or maintenance operation, always turn off the gas and
electrical supplies.
A qualified person can operate the heater with the case removed, provided that due care is exercised. Do not
attempt to remove components with the supplies switched on.
After removing or replacing any gas carrying component, always test for gas soundness.
Make sure all screws and washers are replaced and firmly tightened. Always use pliers to pull off tag
connectors.
Refer to figs. 5, 6, 7, 8, 9 and 10.
Servicing the heater is recommended once a year. Servicing consists of removing dust from the fan rotors
and the heater generally, cleaning the burner and checking for gas soundness and checking the operation of
the heater.
Removal of the outer case.
1.
Turn off gas and electrical supplies.
2.
Remove the two screws located at the bottom of the dressing strip and slacken the two screws located
behind the top louvre, Fig. 1. Pull the case away from the bottom of the heater and lift the case off the
top screws. remove the dressing strip.
3.
To replace, keep the bottom of the case away from the heater and lower it so that the locating brackets
inside the top of the case drop over the top screws. Push the bottom of the case into position and
replace the dressing strip and side screws. Tighten all screws.
With the case removed, any part of the heater can be serviced or replaced as described in the following notes:–
Control Board
1.
Disconnect the wires from the over heat limit switch.
2.
Pull off the 10 way Molex connector from the mounting pins on the control board.
3.
Disconnect the spark located at the lower end of the control board.
4.
Carefully remove the control board by easing the four corners of the "stand off pins".
5.
Refit in the reverse manner.
