Combustion Area And Vent System - Payne PG8UAA Operation And Maintenance Manual

FURNACE
CASING WIDTH
14-3/16
17-1/2
21
24-1/2
* Factory-provided with the furnace.
† Filters may be field modified by cutting to size. Alternate sizes and additional filters may be ordered from your dealer.

COMBUSTION AREA AND VENT SYSTEM

Inspect the combustion area and vent system before each heating season. 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.
! CAUTION: If your furnace makes a loud noise when the main burners are ignited, shut down the furnace—call your
servicing dealer.
Use your flashlight and follow these steps for inspecting the combustion area and vent system of your furnace:
1. Turn off the electrical supply to the furnace and remove the access doors. (See Figs. 9 and 10, or 11.)
2. Carefully inspect the gas burner (see Fig. 30) for dirt, rust, or scale. Then inspect the
relief box, vent pipe connection area, and the vent pipe for rust.
! CAUTION: If dirt, rust, soot, or scale accumulations are found, call your servicing dealer. DO NOT OPERATE THE
FURNACE.
3. Inspect the vent pipe for a sag, holes, or a disconnection. A horizontal vent pipe must slope upward away from furnace. If rusty joints or
seams, or signs of water leakages are found call your dealer for service.
! WARNING: 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. A failure to follow this warning could re-
sult in personal injury or death.
4. Replace the access doors and restore electrical power to the furnace. Be sure bottom door flange is inside of the furnace casing. (See Figs.
16, 17, and 27.)
5. Start the furnace and observe its operation. If possible, watch the burner flames. Are they burning bright blue? (See Fig. 30) If not (or if
you suspect some other malfunction), call your servicing dealer.
BEFORE YOU REQUEST A "SERVICE CALL"
BEFORE YOU CALL FOR SERVICE, CHECK FOR SEVERAL EASILY SOLVED PROBLEMS:
•
Check for sufficient airflow. Check the air filter for dirt. Check for blocked return-air or supply-air grilles throughout your home. Be sure
they are open and unobstructed. If this isn't the cause, call your servicing dealer.
If your furnace isn't operating at all, check the following list for easily solved problems:
•
Is your thermostat set above room temperature? Is the HEAT mode selected?
•
Is the electrical power supply switch ON? Is the blower access door firmly in place? Are any fuses blown? (There is a fuse on the furnace
control.) Has a circuit breaker tripped?
•
Is the manual shutoff valve in the gas supply pipe leading to the furnace in the open position? Does the lever point in the same direction that
the pipe runs (open)? Or is it at right angles (closed)?
NOTE:
Before proceeding with the next checks, turn OFF the electrical power supply to the furnace. Remove the access doors.
•
Is the control knob or switch on the gas valve turned to the ON position? If this or the preceding check shows an interruption in the gas
supply, make sure the gas has not been shut off for safety reasons. If nothing else seems to be wrong, follow the startup procedures found
on pages 4, 5, and 6 of this booklet.
DOWNFLOW/HORIZONTAL FURNACE FILTER TABLE
FILTER SIZE †
(2) 16 x 20 x 1*
(2) 16 x 20 x 1*
(2) 16 x 20 x 1*
(2) 16 x 20 x 1*
—9—
FILTER TYPE
Cleanable
Cleanable
Cleanable
Cleanable
30