7
IDF MAINTENANCE INSTRUCTIONS (CONT’D)
AIR SWITCH
The air switch should be tested regularly to ensure it will cut out if any blockage or
disruption to burner airflow occurs. With the unit running, slide a 6” X 8” piece of cardboard
upwards if front of screen on burner ( under control panel) slowly. When screen is 2/3 covered,
solenoid valve(s) should close, shutting off gas supply. If necessary, adjust set screw clockwise if
burner not cutting out soon enough.
FENWALL IGNITION MODULE
Upon start up, LED light should flash once. If not, refer to trouble shooting guide. Once
signal is detected (after 4 seconds of trial for ignition, TFI) shut off gas then turn back on. Unit
should retry to light after 60 seconds. With unit running, turn off gas supply. Burner should stop
firing and LED should flash 3 times. If you try to fire unit and no response but LED light is staying
on, then replace Fenwall controller. With unit running, connect D.C. Micro amp multimeter probes
to FC pins controller ( beside LED light). You should receive a reading between 3.5-5.5 microamp
(fluctuating 10%). If reading is lower, check flame rod and wire as per trouble shooting instructions.
Disconnect orange MVI wire from controller. Shut off gas and with AC voltage tester, check
between 24v ground side of transformer and MVI terminal for voltage during TFI. Reading should
be steady 24v. AC.
HEAT EXCHANGER
Cleaning Procedures
1. Remove the front cap (Part #48205/20205).
2. Remove the small cover panel (Part #48119/20119) located on the top of the unit
between the flue and front cap (Part #48205).
3. Remove the fan thermostat cover on the outer jacket (Part #48112). Loosen
thermostat and remove from jacket. Remove high limit thermostat cover (Part #48112).
4. Slide heat exchanger out of jacket and place front (discharge or closed) end face down
on ground (Part #48115).
5. Access for combustion chamber and heat exchanger cleaning is provided through the
burner head opening and by removing the heat exchanger cap ring(s) (Part#48115).
6. To reassemble, reverse procedure.
ELECTRODE DRAWER ASSEMBLY
Should be removed when doing maintenance and flame and spark rod cleaned and checked for
cracks or chips. Also inspect wires and connections. Do a continuity check between flame rod and
end of wire to ensure good signal.
ELECTRICAL
Ensure all conduit (BX) connectors are tight. Open plug in cord and check connections tight and
no frayed wires exposed. Check inside connections in control box to ensure good connections.
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.
IMPORTANT
15 AMP CIRCUIT-IDF200 AND IDF350
20 AMP CIRCUIT-IDF500-II
EXTENSION CORD UP TO 50 FEET-12/3 AWG
OVER 50’ TO MAX OF 100 FEET 10/3 AWG
Summary of Contents for IDF 350LPNG
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