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27. SERVICE AGENCY PROCEDURES
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
WARNING
Follow these procedures before inspecting
furnace.
• Turn room thermostat to its lowest or off
setting.
• Turn off manual gas shut-off valve.
• Wait at least 5 minutes for furnace to cool
if it was recently operating.
• Turn off furnace electrical power; failure to
do so could result in injury or death.
MAIN BURNER
Observe the main burners in operation. The flame
should be mostly "blue" with possibly a little orange
(not yellow) at the tips of the flame. The flames
should be in the center of the heat exchanger tubes
and not impinging on the heat exchanger surfaces
themselves.
Observe the fire until the blower starts (there is a
normal delay period until the heat exchanger warms
up). There should be no change in the size or shape
of the flame. If there is any wavering or blowing of
the flame on blower start-up, it is an indication of a
possible leak in the heat exchanger.
FIGURE 15
TOP VIEW OF GAS CONTROL
INLET
PRESSURE
TAP
GAS
INLET
GAS CONTROL KNOB
SHOWN IN "OFF" POSITION
BURNERS / HEAT EXCHANGER / FLUE GAS
PASSAGE WAYS
The burners, heat exchanger and interior flue gas
passages may be inspected using a light on small
mirror or an extension handle. Remove the screws
securing the inducer and collector box. Now inspect
the upper tubes of the heat exchanger.
Check the exterior of the heat exchanger and the
interior flue gas passages for any evidence of
deterioration due to corrosion, cracking or other
causes. If signs of sooting exist, remove the burners
and clean the heat exchanger, as required.
28. MAINTAINING UNIT IN GOOD
WORKING ORDER
The unit should be inspected annually by a qualified
service agency.
WARNING
Use replacement parts listed in the
Replacement Parts list only. The use of
incorrect parts could cause improper unit
operation, resulting in damage, injury or death.
PRESSURE REGULATOR
ADJUSTMENT (UNDER
CAP SCREW)
OUTLET
PRESSURE
TAP
Manual 2100-365
Page 27
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