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STARTUP PROCEDURE & ADJUSTMENT
Furnace must have a 115 VAC power supply properly
connected and grounded. Proper polarity must be
maintained for correct operation. In addition to the
following start-up and adjustment items, refer to further
information in Operational Checks section.
Furnace Cabinet
Check that all furnace cabinet sealing components are in
place (plugs, grommets, gaskets). NOTE; If the furnace
bottom panel has not been removed for a return duct
connection, all perforations must be sealed with duct
sealant compound or other suitable method to prevent air
leakage. For optimal performance verify that all do gaskets
are properly in place and replace as needed to prevent air
leakage.
Drain Trap Priming
The drain trap must be primed prior to furnace startup.
To prime, fill both sides of the drain trap with water.
This ensures proper furnace drainage upon startup and
prohibits the possibility of flue gases escaping through the
drain system.
Furnace Operation
Purge gas lines of air prior to startup. Be sure not purge
lines into an enclosed burner compartment. Follow
NFPA 54, National Fuel Gas Code 8.1 for proper purging
methods. In Canada, follow approved purging methods in
B149.1-15.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector,
or other approved method. Verify that all required kits
(propane gas, high altitude, etc.) have been appropriately
installed.
Furnace Startup
1. Close the manual gas shutoff valve external to the
furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible
setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition
device which automatically lights the burner. Do not
try to light the burner by hand.
5. Move the furnace gas valve manual control to the
OFF position.
6. Wait five minutes then smell for gas. Be sure check
near the floor as some types of gas are heavier than
air.
7. If you smell gas after five minutes, immediately
follow the safety instructions in the Safety
Considerations on page 2 of this manual. If you do
not smell gas after five minutes, move the furnace
gas valve manual control to the ON position.
8. Replace the burner compartment door.
9. Open the manual gas shutoff valve external to the
furnace.
10. Turn on the electrical power to the furnace.
11. Adjust the thermostat to a setting above room
temperature.
12. After the burners are lit, set the thermostat to desired
temperature.
Gas Heat Sequence of Operation
Call for Heat
•
On a call for heat, the thermostat contacts close & the
control board receives 24 VAC on the W terminal.
•
The control board microcomputer runs its self-check
routine.
•
The control verifies the limit switch is closed (24 VAC
on Pin 8 of the 12 Pin connector).
•
The control verifies that pressure switch circuit is
open (0 VAC on Pin 5).
•
The control module performs a gas valve circuitry
check to verify gas valve relay state and presence of
voltage at the valve.
•
The system will energize the Induced draft blower.
•
The pre-purge period begins once the pressure
switch is detected closed (24 VAC on Pin 5).
•
After the completion of pre-purge, the control will
energize the igniter.
•
After completion of the ignitor warm-up period:
•
The gas valve is energized.
•
The ignitor is de-energized as soon as flame is
sensed.
•
After 30 seconds the indoor blower is energized on
heating speed.
•
When the thermostat is satisfied:
•
The gas valve is de-energized.
•
The inducer remains energized for the post purge
period (15 seconds).
•
The indoor blower runs for the selected off delay
period (90 seconds by default, adjustable from 30 –
180 seconds).
Heating Mode Speed Selection
To change the main blower speed in HEATING mode,
follow the following steps:
1. Press left or right button till LED displays "gA1 "(for
single stage HEATING). Press center button and
LED will display the selected speed number as Fxx
(xx: Blower speed number).
2. The control shall rotate available speed number
every time Left/Right switches are pressed. Table
below shows the available speeds for Low & High
heat mode.
3. When the center switch is pressed, the current
displayed speed shall be selected, and control shall
apply the newly selected speed in next heating call.
NOTE: Always refer to the Heating Chart to choose from
available heating speeds
35
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