Instruction manual

31
HORIZONTAL INSTALLATIONS
Filters must be installed in either the central return register
or in the return air duct work.
Refer to the Specification Sheet for recommended mini-
mum filter sizes.
XIV. Startup Procedure and
Adjustment
Furnace must have a 115 VAC power supply properly
connected and grounded. Proper polarity must be main-
tained for correct operation. In addition to the following
start-up and adjustment items, refer to further information
in Section XVI, Operational Checks .
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.
DRAIN TRAP PRIMING
The drain trap must be primed prior to furnace startup. To
prime, fill 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.
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 (pro-
pane gas, high altitude, etc.) have been appropriately
installed.
Furnace Startup
1. Close the manual gas shut-off 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 instructions on page 4 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 shut-off valve external to the
furnace.
10. Turn on the electrical power to the furnace.
11. Adjust the thermostat to a setting above room tem-
perature.
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 60,
90, 120, or 180 second delay period (field selectable),
the circulator blower will be de-energized.
2. Remove the burner compartment door and move the
furnace gas valve manual control to the OFF position.
3. Close the manual gas shut-off 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 tap or at a hose
fitting installed in the gas piping drip leg. The supply
pressure must be measured with the burners operating.
To measure the gas supply pressure, use the following
procedure.
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Connect a calibrated water manometer (or appropri-
ate gas pressure gauge) at either the gas valve inlet
pressure tap or the gas piping drip leg.
NOTE: At either location, a hose fitting must be installed
prior to making the hose connection.