E.Remove assembly and replace main orifice.
F.Reassemble in reverse order and check system operation. NOTE: Check all gas line fittings for leaks.
TEMPERATURE CONTROL POTENTIOMETER - REPLACEMENT
A.Remove control box cover.
B.Loosen screw and slide knob off potentiometer shaft.
C.Remove mounting nut and push out.
D.Remove three (3) wires from electronic temperature control, note wire color and location for reinstallation.
E.Reassemble in reverse order and check system operation.
ON-OFF SWITCH (POWER) - REPLACEMENT
A.Remove control box cover.
B.Depress spring clips on side of switch and push out.
C.Remove wires from back of switch, note wire number and location.
D.Reassemble in reverse order and check system operation.
NOTE: Make sure switch housing is fully seated in control box housing.
DUAL TEMPERATURE DISPLAY - REPLACEMENT
A.Shut off power at main breaker.
B.Remove control panel top and front cover.
C.Remove all wires from temperature display and mark wires for reassembly.
D.Pry temperature display to remove from mounting tabs (this is a pressure fit).
E.Reassemble in reverse order.
CALIBRATE TEMPERATURE
A.(See ‘Temperature setting for new temperature control board’.) Set Temp. Control to 500°F. Allow temperature to stabilize.
B."Fine Tune" temperature setting to achieve measured temperature swings from 497°F to 503°F. When actual temperature falls between 497°F and 503°F, the display must show 500°F.
C.Adjust temp. adj. pot on Temp Display to achieve a display reading of 500°F (260°C).
TRANSFORMER-TEMPERATURE DISPLAY - REPLACEMENT
A.Remove control box cover and front panel.
B.Remove five (5) wires (2 primary side, 3 secondary side), note color and location of wires for reinstallation.
C.Remove two (2) screws from transformer base and replace assembly.
D.Reassemble in reverse order and check system operation.
BURNER CONTROL TRANSFORMER - REPLACEMENT
A.Remove appropriate control box cover.
B.Remove two (2) wires on primary side, note color and location.
C.Remove two (2) wires on secondary side at burner control (Honeywell).
D.Remove two (2) screws from transformer base and replace assembly.
E.Reinstall in reverse order and check system operation.
CAPACITOR, MAIN FAN MOTOR (7.5 MFD/370V) - REPLACEMENT
A.Remove appropriate control box cover.
B.Remove two (2) wires from capacitor, note wire number and location. WARNING: Capacitor has a stored charge, discharge before handling or testing.
C.Cut two (2) tyraps securing capacitor to base and replace.
D.Reinstall in reverse order and check system operation.
14 | Low Profile – |
