Goodman Mfg VC8 instruction manual Upright Installations

START-UP PROCEDURE AND ADJUSTMENT

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.

UPRIGHT INSTALLATIONS

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.

CIRCULATION AIR FILTERS

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.

M INIM UM FILTER SIZES for DISPOSABLE FILTERS

FURNACE INPUT	FILTER SIZE
70M	768 in2
90M	960 in2
115M	1022 in2

DISP OSA B LE NOM INA L 300 F .M . FA CE VELOCITY

HORIZONTAL INSTALLATIONS

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

START-UP PROCEDURE AND 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 sec- tion.

HEAT ANTICIPATOR SETTING

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.

FURNACEOPERATION

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.

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 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.

FURNACE SHUTDOWN

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.

GAS SUPPLY PRESSURE MEASUREMENT

CAUTION

TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING.

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.

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