
9
MAINTENANCE INSTRUCTIONS
!WARNING!: Heaters should be fully serviced annually to ensure proper
erformance. Maintenance should be performed by trained personnelp
only. Incorrect maintenance may result in improper operation and
serious injury.
HIGH LIMIT SWITCH
The limit switch should be checked every heating season to ensure the burner will
shutdown if temperature exceeds 220 F. (This can be done by restricting the air
o
flow through the unit. After tests are complete, remove restriction for proper operation).
FAN SWITCH
The fan switch has been selected to allow for preheating of the heat exchanger to ensure that
only heated air is allowed to enter the space. Upon satisfying the need for heat, the fan switch will
continue to run the supply fan until the heat exchanger has cooled sufficiently. This feature will
help prolong the life of your heat exchanger.
FUEL FILTER
Replace cartridge every usage or sooner, depending(48164 or 48164A)once week of normal
upon fuel .quality
BURNER
The electrode spacing must be checked and adjusted, if necessary after every nozzle
change. Nozzle should be replaced annually or sooner if burner cannot be set up to
operate properly. Nozzle size and type are marked on the rating plate.
ELECTRICAL
Ensure all conduit (BX) connectors are tight. Check inside connections in control box to ensure
good connections. Check marrettes.
FAN
Check for dust or dirt build up on blades. Run heater to check for fan vibration. Replace fan blade
if vibration is noticeable.
MOTORS
No lubrication is necessary since the bearings are the sealed type Clean motor of existing dust or dirt..
FUEL SYSTEM
Periodically remove fuel tank drain plug and clean tank. Do not store unit containing
furnace oil for long periods. The quality of fuel oil will affect light off at low ambient
temperatures, #1 fuel oil or kerosene are recommended for temperatures below -10 C /
o
8 F.
o(see page 7 for recommended settings if using #2 fuel oil in cold temperature)
FUEL PUMP
Check fuel pump pressure on a regular basis. This should be checked at the bleeder screw.
THE CLEANWITH CUT PUMP ADD 10 LBS TO THIS READING TO GET THE TRUE
PRESSURE. There is a pressure loss when fuel passes through solenoid valve. Example:
IDH200QR oil, 60 Ppressure should be read on the guage at 1 SI, reading at nozzle line will
50then be 1 . Units with the Suntec A2YA7916, pressure reading can be checked at the guage
port. This will provide a true reading.
HEAT EXCHANGER
If a smokey condition continues even after adjusting the air band assembly, the heat exchanger
should be thoroughly cleaned as per next page.
CLEANING PROCEDURE ON HEAT EXCHANGER
1. Remove 4 bolts securing rear hood (21008) to heater and remove hood.
2. Remove exhaust gas vent trim plate (21206)
3. Remove the high limit cover.
4. Remove the push on wires from the limit switch(s) (21006 & 21005 LP/NG) and note their
proper connection location for re-assembly.
5. Loosen the nut securing the connector for the armoured cable where it enters the thermostat
limit switch enclosure and pull entire wiring bundle our from opening in the enclosure end plate.
6. Remove the screws securing top half of the heat exchanger enclosure (21204A) to the bottom
half.