Check Safety Controls; Checklist - Payne PG80ESAA Installation, Start-Up, Operating And Service And Maintenance Instructions

6. Set thermostat heat anticipator.
a. Mechanical thermostat - - Set thermostat heat anticipator
to match the amp. draw of the electrical components in
the R- -W circuit. Accurate amp. draw readings can be ob-
tained at the wires normally connected to thermostat sub-
base terminals, R and W. The thermostat anticipator
should NOT be in the circuit while measuring current.
(1.) Remove thermostat from subbase or from wall.
(2.) Connect an amp. meter as shown in Fig. 43 across
the R and W subbase terminals or R and W wires at
wall.
(3.) Record amp. draw across terminals when furnace is
in heating and after blower starts.
(4.) Set heat anticipator on thermostat per thermostat in-
structions and install on subbase or wall.
b. Electronic thermostat: Set cycle rate for 4 cycles per hr.
7. Adjust blower off delay The blower off delay has 4 ad-
justable settings from 90 sec to 180 sec. The blower off
delay jumpers are located on the furnace control board.
(See Fig. 24.)
To change the blower off delay setting, move the jumper
from one set of pins on the control to the pins used for the
selected blower off delay. Factory off delay setting is 120
sec.
8. Set airflow CFM for cooling
Select the desired blower motor speed lead for cooling air-
flow. See Table 5- -Air Delivery- -CFM (With Filter) for
lead color identification.

Check Safety Controls

The flame sensor, gas valve, and pressure switch were all checked
in the Start- -up procedure section as part of normal operation.
1. Check Main Limit Switch(es)
This control shuts off combustion control system and en-
ergizes air- -circulating blower motor, if furnace overheats.
By using this method to check limit control, it can be es-
tablished that limit is functioning properly and will operate
if there is a restricted duct system or motor failure. If limit
control does not function during this test, cause must be
determined and corrected.
a. Run furnace for at least 5 minutes.
b. Gradually block off return air with a piece of cardboard
or sheet metal until the limit trips.
c. Unblock return air to permit normal circulation.
d. Burners will re- -light when furnace cools down.
2. Check draft safeguard switch.
The purpose of this control is to cause the safe shutdown
of the furnace during certain blocked vent conditions.
a. Verify vent pipe is cool to the touch.
b. Disconnect power to furnace and remove vent connector
from furnace vent elbow.
c. Restore power to furnace and set room thermostat above
room temperature.
d. After normal start- -up, allow furnace to operate for 2 min-
utes, then block vent elbow in furnace 80 percent of vent
area with a piece of flat sheet metal.
e. Furnace should cycle off within 2 minutes. If gas does not
shut off within 2 minutes, determine reason draft safe-
guard switch did not function properly and correct condi-
tion.
f. Remove blockage from furnace vent elbow.
g. Switch will auto- -reset when it cools.
h. Re- -install vent connector.
NOTE: Should switch remain open longer than 3 minutes,
furnace control board will lockout the furnace for 3 hours. To
reset furnace control board, turn thermostat below room
temperature or from HEAT to OFF and turn 115v power OFF,
then back ON.
3. Check Pressure Switch
This control proves operation of the draft inducer blower.
a. Turn off 115- -v power to furnace.
b. Disconnect inducer motor lead wires from wire harness.
c. Turn on 115- -v power to furnace.
d. Set thermostat to "call for heat" and wait 1 minute. When
pressure switch is functioning properly, hot surface ig-
niter should NOT glow and control diagnostic light
flashes a status code 31. If hot surface igniter glows when
inducer motor is disconnected, shut down furnace imme-
diately.
e. Determine reason pressure switch did not function prop-
erly and correct condition.
f. Turn off 115- -v power to furnace.
g. Reconnect inducer motor wires, replace outer door, and
turn on 115- -v power.
h. Blower will run for 90 sec before beginning the call for
heat again.
i. Furnace should ignite normally.

Checklist

1. Put away tools and instruments. Clean up debris.
2. Verify that blower OFF- -DELAY time is selected as de-
sired.
3. Verify that blower and burner access doors are properly in-
stalled.
4. Cycle test furnace with room thermostat.
5. Check operation of accessories per manufacturer's instruc-
tions.
6. Review User's Guide with owner.
7. Attach literature packet to furnace.
10 TURNS
5.0 AMPS ON AMMETER
EXAMPLE:
10 TURNS AROUND JAWS
Fig. 43 - - Amp. Draw Check with Ammeter
33
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
(ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
HOOK-AROUND
AMMETER
R Y W G
FROM UNIT 24-V
CONTROL TERMINALS
0.5 AMPS FOR THERMOSTAT
=
ANTICIPATOR SETTING
A96316