Carrier 58GP - Automatic Intermittent Ignition Pilot Shutdown; Furnace Routine Maintenance; Check the Air Filter

door must be removed before the control access door is
removed, then reinstalled.
4. To shut off the burners but keep the pilot light burn¬
ing, turn the control knob of the internal gas valve to
the PILOT position.
5. To shut off the complete gas control system (pilot and
burners), turn (and depress if required) the control knob
on the internal gas valve clockwise or counterclockwise
(depending on the type valve supplied with your fur¬
nace) to the indicated OFF position.
6. Close the external manual gas valve. See Fig. 8.
7. Replace the access door. See Fig. 15 or 16. On down¬
flow furnaces, remove the blower access door, install
the control access door, then reinstall the blower access
door.
8. If the furnace is being shut down because a malfunc¬
tion is suspected, call your dealer as soon as possible.
NOTE: To conserve energy when the heating season has
ended, you should shut down your manually ignited pilot.
AUTOMATIC INTERMITTENT IGNITION PILOT
1. Set your room thermostat to the lowest temperature
setting. See Fig. 19.
2. Close the external manual gas valve. See Fig. 8.
3. Turn OFF the electrical supply to your furnace. See
Fig. 20.
4. Remove the access door(s) from your furnace. Lift up
and out at the bottom. See Fig. 10 for upflow and Fig.
11 for downflow furnaces.
NOTE: The blower access door must be installed to permit
furnace operation. On downflow furnaces, the blower access
door must be removed before the control access door is
removed, then reinstalled.
5. Turn the knob on the internal gas valve clockwise or
counterclockwise (depending on the type valve supplied
with your furnace) to the indicated OFF position. See
Fig. 18.
6. Replace the access door. Insert door end into the fur¬
nace, push the door in and down. See Fig. 15 or 16. On
downflow furnaces, remove the blower access door,
install the control access door, then reinstall the blower
access door.
7. If the furnace is being shut down because a malfunc¬
tion is suspected, call your dealer as soon as possible.
PERFORMING ROUTINE MAINTENANCE
Inspect your furnace before each heating season. No obvi¬
ous signs of deterioration of the furnace should exist.
• The return-air duct connection(s) must be physically
sound, sealed to the furnace casing, and terminate outside
the space containing the furnace.
The physical support of the furnace must be sound without
sagging, cracks, gaps, etc. If the furnace uses only side
return ducts, the opening in the furnace base must be
sealed.
With the proper maintenance and care, your furnace will
operate economically and dependably. Maintenance can eas¬
ily be accomplished by someone who follows the directions
found in this manual. However, before beginning mainte¬
nance, consider these safety precautions:
• TURN OFF THE ELECTRICAL POWER SUPPLY
TO YOUR FURNACE BEFORE REMOVING THE
ACCESS DOORS TO SERVICE OR PERFORM
MAINTENANCE.
• ALTHOUGH SPECIAL CARE HAS BEEN TAKEN
TO MINIMIZE SHARP EDGES, BE EXTREMELY
CAREFUL WHEN HANDLING PARTS OR REACHING
INTO THE FURNACE.
CHECK THE AIR FILTER
A dirty filter will cause excessive stress on the furnace heat
exchanger. This stress can cause it to overheat and fail.
Check the filter(s) every 3 to 4 weeks. Replace filter(s) when
necessary, or clean if you have the reusable type.
Furnaces with side-return air inlets may have different size
and type filters. Measure the existing filter for an exact fit.
Use same type filter for replacement.
The air filter for upflow furnaces is normally located in the
blower compartment. See Fig. 3. Filters for the downflow
furnaces are typically located in the return-air plenum near
the blower. If the filters have been installed in another loca¬
tion, contact your dealer for instructions.
To change or clean your filter, follow these steps:
1. Turn OFF the electrical supply to the furnace. See Fig.
20. Remove both access doors from your upflow fur¬
nace—the control access door first, and the blower
access door second. Lift doors up and out. See Fig. 10
or 11. Remove only the blower access door of your
downflow furnace.
2. Remove the filter.
• UPFLOW FURNACES ONLY: Push the filter retainer
toward the back of the furnace until it clears the flange at
the front of the furnace casing. Gently remove the filter and
carefully turn it over to avoid spilling any dirt that may be
on the filter. See Figs. 21 and 22.
A86038
A86039
• DOWNFLOW FURNACES ONLY: Remove the two fil¬
ters from inside the return-air plenum which is attached to
the top of your furnace. Reaching in and up through the
blower access area, tip the left-side filter toward center and
raise it from the v-shaped channel in which it rests. Lower
and remove the filter gently so that you do not dislodge any
dirt that may have accumulated on it. Now, remove the fil¬
ter on the right side in similar manner, down through the
left-hand side of the blower compartment. See Figs. 23 and
24.
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