Goodman Mfg VC8 User Manual

23

ply with UL900 or CAN/ULCS111 standards. If the furnace is
installed without filters, the warranty will be voided.

NOTE: An undersized opening will cause reduced airflow. The
bottom return is set up as a knock out.

Depending on the installation and/or customer preference, dif-
fering filter arrangements can be applied.  Filters can be in-
stalled in the central return register or a side panel external
filter rack kit (upflows), or the ductwork above a downflow fur-
nace.  As an alternative, a media air filter or electronic air cleaner
can be used as the primary filter.

One of the most common causes of a problem in a forced air
heating system is a blocked or dirty filter. Circulating air filters
must be inspected monthly for dirt accumulation and replaced
if necessary. Failure to maintain clean filters can cause prema-
ture heat exchanger failure.

A new home may require more frequent replacement until all
construction dust and dirt is removed. Circulating air filters are
to be installed in the return air duct external to the furnace
cabinet.

70M

768 in

2

90M

960 in

2

115M

1022 in

2

D ISP OSA B LE  N OM IN A L 300 F .M .  FA C E VELOC ITY

Filters must be installed in either the central return register or
in the return air duct work.

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 sec-
tion.

The heat anticipator in the room thermostat must be correctly

adjusted to obtain the proper number of cycles per hour and to

prevent “overshooting” of the setting.  Set the heat anticipator

setting to  0.7 amps.  Follow the thermostat manufacturer’s

instructions on how to adjust the heat anticipator setting.

Purge gas lines of air prior to startup.  Be sure not purge lines

into an enclosed burner compartment.

Check for leaks using an approved chloride-free soap and wa-

ter solution, an electronic combustible gas detector, or other

approved method.  Verify that all required kits (propane gas,

high altitude, etc.) have been appropriately installed.

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 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.

1. Set the thermostat to the lowest setting.

The integrated control will close the gas valve and
extinguish flame.  Following a 15 second delay, the
induced draft blower will be de-energized.  After a 120,
150, 180 or 210-second delay period (field selectable
delay OFF [90, 120, 150, 180] plus 30-second ramp
down), the circulator blower de-energizes.

2. Remove the burner compartment door and move the

furnace gas valve manual control to the OFF position.

3. Close the manual gas shutoff valve external to the furnace.
4. Replace the burner compartment door.

The line pressure supplied to the gas valve must be within the
range specified below.  The supply pressure can be measured
at the gas valve inlet pressure boss or at a hose fitting installed
in the gas piping drip leg.  The supply pressure must be mea-
sured with the burners operating.  To measure the gas supply
pressure, use the following procedure.