FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
6. Turn off the gas supply at the manual gas valve.
1. Closed valve
2. Open valve
7. Remove the inlet pressure tap plug on the gas control valve
and connect pressure gauge to the ¹⁄₈ in. NPT inlet
8. Turn on the gas supply at the manual gas valve.
9. Observe the inlet pressure.
The minimum inlet gas supply pressure is 5 in. W.C. for
natural gas and 11 in. W.C. for propane gas.
The maximum inlet gas supply pressure is 10.5 in. W.C. for
natural gas and 13 in. W.C. for propane gas.
10. Turn off the gas supply at the manual gas valve.
IMPORTANT: If the inlet gas supply pressure is not within the
minimum and maximum range as shown on the rating plate,
contact your gas supplier.
11. Disconnect the pressure gauge from the ¹⁄₈ in. NPT inlet
12. Replace the inlet pressure tap plug on the gas control valve.
13. Turn on the gas supply at the manual gas valve.
14. Test all connections by brushing on an approved non-
corrosive leak-detection solution. Bubbles will show a leak.
Correct any leak found.
At test pressures greater than ¹⁄₂ psig (3.5 kPa), the
furnace and the manual gas valve must be disconnected
from the gas supply piping system.
At test pressures less than or equal to ¹⁄₂ psig (3.5 kPa),
the furnace must be isolated from the gas supply piping
system by closing the manual gas valve.
15. Replace the burner access door.
Check the Furnace Input Rate
The furnace input rate must not exceed the input rating on
the furnace rating plate.
At altitudes from 2,000 to 7,500 ft the furnace input rate must
not exceed that on the rating plate multiplied by the Input
Factor in the Manifold Pressure vs. Altitude chart.
This furnace is equipped for rated input at manifold pressures
of 3.5 in. W.C. for natural gas and 10.0 in. W.C. for propane
1. For natural gas, check the furnace rate by observing the gas
meter, making sure all other gas appliances are turned off.
The test hand on the meter should be timed for at least one
= Cubic feet per Revolution x 3600 x Heating
# Seconds per Revolution
2. The actual heating value of your gas can be obtained from
your local utility company.
Adjust the Furnace Input Rate
For altitudes 4,500 to 7,500 feet above sea level.
1. The gas control valve is located on the outside front of the
2. Move the gas control switch to the OFF position. Use only
your hand to move the gas control switch; tools are not
3. Remove the outlet pressure tap plug on the gas control valve
and connect pressure gauge to the ¹⁄₈ in. NPT outlet pressure
Gas Control Valve
1/2" NPT Inlet
" NPT Inlet pressure tap
2. Regulator adjusting cap
3. Diagnostic LED
" NPT Outlet pressure tap
5. Gas control switch
4. Be sure the gas control switch has been in the OFF position
for at least 5 minutes before starting the unit.
5. Move the gas control switch to the ON position.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. This furnace cannot be lighted
manually. Do not try to light the burner by hand.
1/2" NPT Outlet