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MAINTENANCE 13. Turn gas and electricity back on and set the
thermostat high enough to cycle the unit to go
1. Remove the access panel. through a complete cycle to ensure proper
operation and that there is no gas leakage.
2. Close manual gas valve and disconnect the union
on the gas line. 14. Replace access panel and set the thermostat
at the desired setting.
3. Disconnect wires from the gas valve along the
with the ignition wires from S1 and S2 on the 15. Replace any worn or broken components and
module. wiring as necessary to ensure trouble-free
operation.
4. Remove the screws that attach the burner tray
assembly from the vestibule panel. The entire 16. The heater and its gas valve must be
assembly comes out as one piece.. disconnected from the gas supply piping, and
the supply line must be plugged prior to
5. Carefully clean the burners with a small wire conducting any pressure/leak testing of that
brush and vacuum. system at test pressures in excess of 1/2 psi
(3.5 kPa).
6. While assembly is out, check the orifices to make
there is no blockage. Close the manual shut-off valve to the unit
during any pressure testing of the gas supply
7. Check each tube type heat exchanger for dirt or piping system at test pressures equal to or
cracking. If dirty, clean with a wire brush and less than 1/2 psi (3.5 kPa).
vacuum. If any cracks are seen, replace the
heat exchanger assembly.
SAFETY DEVICES
8. Re-assemble burner tray assembly and gas 1) Limit Control
piping. Make sure piping is tight. This control is located in the access compart-
ment and the element is located in the air stream
9. Check all wiring for loose connections or cracks by the tube heat exchanger. This control will
in the insulation. Also check to make sure the shut off the gas to the burners should over-
rubber tube connected to the pressure switch heating result. The limit control will function if
has not dried-out and cracked. Replace as the wall thermostat or some other component(s)
necessary. malfunction. Once this limit cools, it will reset
automatically and allow the heater to re-try for
10. Re-connect wiring to the gas valve and to the ignition. If the same problem should occur,
terminals S1 and S2 on the module. immediately shut the gas supply and electricity
off. Call a qualified technician immediately
11. Check circulating blower assembly to make sure for service.
that there is no damage to the fan blade and that
the blade is secured to the motor shaft. 2) Rollout Switches
The switches are located on the bottom burner
12. Power exhaust assembly - the motor used is panel. If for some reason flames rollout during
permanently lubricated. If this assembly needs an ignition cycle and touch these switches, the
cleaning, blow out the cooling air passages of gas flow will be shut off. When cooled, the
the motor with compressed air. switches must be manually reset
by pushing in
on the push button located on the top of each
switch.
17