Start- -Up, Adjustment, And Safety Check - Payne PG96VAT Installation, Start-Up, Operating And Service And Maintenance Instructions

START- -UP, ADJUSTMENT, AND SAFETY
CHECK
NOTICE
Important Installation and Start- -up Procedures
Failure to follow this procedure may result in a nuisance
smoke or odor complaint.
The manifold pressure, gas rate by meter clocking,
temperature rise and operation must be checked after
installation. Minor smoke and odor may be present
temporarily after start- -up from the manufacturing process.
Some occupants are more sensitive to this minor smoke and
odor. It is recommended that doors and windows be open
during the first heat cycle.
General
1. Furnace must have a 115-v power supply properly connect-
ed and grounded.
NOTE: Proper polarity must be maintained for 115-v wiring.
Control status indicator light flashes rapidly and furnace does not
operate if polarity is incorrect or if the furnace is not grounded.
2. Thermostat wire connections at terminals R, W/W1, G, and
Y/Y2 must be made at 24-v terminal block on furnace con-
trol.
3. Natural gas service pressure must not exceed 0.5 psig (14-
in. w.c., 350 Pa), but must be no less than 0.16 psig (4.5-in.
w.c., 1125 Pa).
4. Blower door must be in place to complete 115-v electrical
circuit and supply power to furnace components.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation or performance dissatisfaction.
These furnaces are equipped with a manual reset limit
switch in burner assembly. This switch opens and shuts off
power to the gas valve if an overheat condition (flame
rollout) occurs in the burner assembly/enclosure. Correct
inadequate combustion- -air supply, improper gas pressure
setting, improper burner or gas orifice positioning, or
improper venting condition before resetting switch. DO
NOT jumper this switch.
Before operating furnace, check flame rollout manual reset switch
for continuity. If necessary, press button to reset switch.
EAC-1 terminal is energized whenever blower operates. HUM
terminal is only energized when blower is energized in heating.
Setup Switches
There are two sets of setup switches on the furnace control board.
These switches configure the furnace for correct application
requirement. They also select the airflow settings for Air
Conditioning and Continuous Fan airflows.
The Setup Switch locations are shown and described on Fig.
The setup switches are also shown on the unit wiring label.
Setup Switches (SW1)
The furnace control has 8 setup switches that may be set to meet
the application requirements. Refer to the Adjustments section for
setup switch configurations.
appropriate requirement:
66.
To set these switches for the
1. Remove blower door.
2. Locate setup switches on furnace control.
3. Configure the setup switches as necessary for the
application.
4. Replace blower door.
NOTE: If a bypass humidifier is used, setup switch SW1-3 (Low
Heat Rise Adjust) should be in ON position. This compensates for
the increased temperature in return air resulting from bypass.
Air Conditioning (A/C) Setup Switches (SW2- - 6, 7, 8)
The air conditioning setup switches are used to match furnace
airflow to required cooling airflow or high stage cooling airflow
when a two- -stage outdoor unit is used. Refer to the Adjustments
section for setup switch configurations.
To set the desired cooling airflow:
1. Remove blower door.
2. Locate A/C setup switches on furnace control.
3. Determine air conditioning tonnage used.
4. Configure the switches for the required cooling airflow.
NOTE: Incorrect airflow caused by improper A/C switch setup
may cause condensate blow-off or a frozen indoor coil in the
cooling mode.
5. Replace blower door.
Continuous Fan (CF) Setup Switches (SW2- - 3, 4, 5)
The CF setup switches are used to select desired airflow when
thermostat is in continuous fan mode or to select low-cooling
airflow for two- -speed cooling units. Refer to the Adjustments
section for setup switch configurations. To set desired cooling
airflow:
1. Remove blower door.
2. Locate CF setup switches on furnace control.
3. Determine air conditioning tonnage used for low-cooling
(when used) or desired continuous fan airflow.
4. Configure the switches for the required airflow.
5. Replace blower door.
Setup Switch (SW2- - 1, 2)
Setup Switch SW2- -1 is for Twinning on approved models. Setup
switch SW2- -2 is used to select adjust airflow.
Refer to Fig. 66 for configuration of SW2- -1 and SW2- -2 airflow
options.
Prime Condensate Trap with Water
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow these warnings could result in personal injury
or death.
Failure to use a properly configured trap or NOT
water- -priming trap before operating furnace may allow
positive pressure vent gases to enter the structure through drain
tube. Vent gases contain carbon monoxide which is tasteless
and odorless.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation or performance satisfaction.
Condensate trap must be PRIMED or proper draining may
not occur. The condensate trap has two internal chambers
which can ONLY be primed by pouring water into the
inducer drain side of condensate trap.
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