Payne PG9MTAV Service Manual Download Page 3

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7. An ESD service kit (available from commercial sources)

may also be used to prevent ESD damage.

CARE AND MAINTENANCE

For continuing high performance and to minimize possible

equipment failure, it is essential that maintenance be performed

annually on this equipment. Consult your local dealer about proper
maintenance and maintenance contract availability.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.
Turn off the gas and electrical supplies to the unit before

performing any maintenance or service. Follow the operating

instructions on the label attached to the furnace.

WARNING

The minimum maintenance that should be performed on this

equipment is as follows:

1. Check and clean or replace air filter each month as needed.
2. Check blower motor and wheel for cleanliness annually.
3. Check electrical connections for tightness and controls for

proper operation each heating season. Service as necessary.

4. Check for proper condensate drainage. Clean as necessary.
5. Check for blockages in combustion-air and vent

pipes annually.

6. Check burners for cleanliness annually.

CUT HAZARD

Failure to follow this caution may result in personal injury.
Be careful of sharp metal edges, etc. Use care and wear

protective clothing, safety glasses, and gloves when

removing parts.

CAUTION

Procedure 1 — Cleaning and/or Replacing

Air Filter

The air filter arrangement may vary depending on the application
or orientation.

FIRE, CARBON MONOXIDE AND POISONING

HAZARD

Failure to follow this warning could result in property damage,

personal injury, or death.
Never operate unit without a filter or with the blower access

panel removed. Operating a unit without a filter or with the

blower access door removed could cause damage to the

furnace blower motor. Dust and lint on internal parts of

furnace can cause a loss of efficiency.

WARNING

NOTE

: If filter has cross-mesh binding, binding must face blower.

If filter has an air direction arrow, arrow must point toward blower.
To clean or replace the filters, proceed as follows:

1. Turn off electrical supply to furnace.
2. Remove blower door.

3. Slide filter out of furnace (See Fig. 2 or 3.) .
4. Furnaces are equipped with permanent, washable filter(s).

Clean filter by spraying cold tap water through filter in
opposite direction of airflow.

5. Rinse filter and let dry. Oiling or coating of filter is not

recommended.

6. Slide filter into furnace.
7. Replace blower door.
8. Turn on electrical supply to furnace.

Procedure 2 — Blower Motor and Wheel

Maintenance

To ensure long life, economy, and high efficiency, clean
accumulated dirt and grease from blower wheel and

motor annually.
The inducer and blower motors are pre-lubricated and require no

additional lubrication. These motors can be identified by the
absence of oil ports on each end of the motor.
The following items should be performed by a qualified service

technician.
Clean blower motor and wheel as follows:

1. Turn off electrical supply to furnace.
2. Remove blower door.
3. Disconnect blower motor wires from furnace control board.

Field thermostat connections may need to be disconnected
depending on their length and routing.

4. Remove control box mounting screws, and position control

box, transformer, and door switch assembly to right side of
furnace casing.

5. If condensate trap is located in left-or right-hand side of

furnace casing, proceed to item 6, otherwise remove trap

and tubing as described below. (See top Fig. 6, 7, or 8.)

a. Disconnect field drain connection from condensate trap.

b. Disconnect

drain

and