6
IDF MAINTENANCE INSTRUCTIONS
!WARNING!: Heaters should be fully serviced annually to ensure proper
Performance. Maintenance should be performed by trained personnel
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
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shutdown if temperature exceeds 220 F. (This can be done by restricting the air
flow through the unit. After tests are complete, remove restricters as both 12” ducts
must be open 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 (48164 or 48164A)once every week of normal usage or sooner, depending
upon fuel quality.
FLAME DETECTOR
When doing maintenance, turn on machine. After having run the machine run for over 10
seconds, press red button on primary control. Hold for one second and then release. If light
flashes once or twice, cad cell is functioning properly. If flashes three times, check alignment and
proper flame. If correct a cleaning of the face of the cad cell with a soft non abrasive cloth is
recommended. If light flashes four times, follow above steps. If flashing four times persists,
replace cad cell.
LED FLASHES CAD CELL RESISTANCE
1 0-400 Ohms
2 400-800 Ohms
3 800-1600 Ohms
4 >= 1600 Ohms
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. Check for tightness of the set screw. 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
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temperatures, #1 fuel oil or kerosene are recommended for temperatures below -10 C /
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8 F. (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. WITH
THE CLEAN 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: IDF350 pressure
should be read on the guage at 135 PSI, reading at nozzle line will then be 125. 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.
