Combustion Air And Vent System - Payne PG9MAB Owner's Manual

FURNACE CASING WIDTH
IN (MM)
17--- 1/2 (445)
21 (533 )
24--- 1/2 (610)
* Filters with a side return- -air may have a different filter size. Measure the filter to obtain the correct size.
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Use care when cutting support rods in filters to protect against
flying pieces and sharp rod ends. Wear safety glasses, gloves,
and appropriate protective clothing.

COMBUSTION AIR AND VENT SYSTEM

WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury
or death.
If holes are found or if the vent pipe is obstructed or is not
connected, toxic fumes can escape into your home. DO NOT
OPERATE YOUR FURNACE. Call your dealer for service.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation.
For proper and safe operation the furnace needs air for
combustion and ventilation. Do not block or obstruct air
openings on the furnace, air opening to the area in which the
furnace is installed, and the space around the furnace.
Visually inspect the combustion area and vent system before each
heating season. Make sure that all PVC pipes leading into the
combustion area and vent are free from any cracks and sags. An
accumulation of dirt, soot, or rust can mean a loss of efficiency and
improper performance. Buildups on the main burners can cause
faulty firing. This "delayed ignition" is characterized by an
alarmingly loud sound.
Check the combustion- -air intake adjacent to the furnace or outside
your home for blockage. Also check the vent pipe on the outside of
your home for blockage.
NOTE: If your furnace makes a loud noise when the main burners
are ignited, shut down the furnace and call your servicing dealer.
Use your flashlight and follow these steps for inspecting the
combustion area and vent system of your furnace:
Table 1 – Furnace Air Filter Table
FILTER QUANTITY AND SIZE *
SIDE RETURN
*
IN (MM)
(1) 16 x 25 x 3/4
(406 x 635 x 19)
(1) 16 x 25 x 3/4
(406 x 635 x 19)
(1) 16 x 25 x 3/4
(406 x 635 x 19)
BOTTOM RETURN*
IN (MM)
(1) 16 x 25 x 3/4
(406 x 635 x 19)
(1) 20 x 25 x 3/4
(508 x 635 x 19)
(1) 24 x 25 x 3/4
(610 x 635 x 19)
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
If dirt, rust, soot, or scale accumulations are found, call
your dealer. Do not operate your furnace.
1. Turn off electrical supply to the furnace and remove the
main furnace door. (See Fig. 20 and 21.)
2. Remove burner enclosure front. Inspect the gas burners, ig-
niter area, and remainder of furnace for dirt, rust, soot or
scale.
Fig. 29 - - Upflow Burner Enclosure
Fig. 30 - - Downflow Burner Enclosure
3. Inspect the combustion- -air and vent PVC pipes for sags,
holes, cracks, water leaks, blockage or disconnections. Hori-
zontal portions of vent pipe must slope downward toward
the furnace.
4. Reinstall burner enclosure front.
5. If your furnace is free of the above conditions, replace main
furnace door and turn on electrical and gas supplies to the
furnace.
11
FILTER TYPE*
3/4" (19 mm) thick washable
3/4" (19 mm) thick washable
3/4" (19 mm) thick washable
A00223
A00224