Installation Manual

21
11. Read the rating plate affixed to the appliance to
determine its rated input (Btu/hr) and the size of the
factory installed orifices.
IMPORTANT NOTE:
Before installing an orifice, check the side or face of
the orifice for the drill number to ensure that it is the
appropriate size.
12. Install the appropriate LP/Propane gas burner orifices
into the gas manifold assembly. NOTE: The orifices are
included with the furnace. To prevent cross threading,
hand tighten the orifices into the gas manifold assembly
until snug, then tighten with a wrench.
13. Unscrew the gas valve pressure regulator cap marked
NAT. Invert the cap so LP faces up. Reinstall the cap
and tighten until snug. Make sure LP is visible after
conversion.
WARNING:
Do not use Teflon tape or pipe joint compound
on the orifice threads. The hole in the orifice
may become blocked and cause fire, explosion,
property damage, carbon monoxide poisoning,
personal injury, or death.
14. Reinstall the gas manifold assembly to the burner
assembly with the 4 screws, that were removed earlier.
NOTE: It is important that the center of the orifices
are aligned with the center of the burners.
15. Reinstall the burner box door with the 6 screws that
were removed earlier in step 4.
16. Reconnect the gas piping to the gas valve inlet.
17. Reconnect the wires to the gas valve terminals.
Gas Pressure Verification
Measuring the Supply Gas Pressure
1. Turn OFF the gas supply at the manual valve located
on the outside of the unit.
2. Using a 3/16” Allen wrench, remove the plug from the
inlet pressure tap (INLET side of gas valve). See Figure
19 (page 20).
3. Install an 1/8” NPT pipe thread fitting, that is compatible
with a Manometer or similar pressure gauge.
4. Connect the Manometer or pressure gauge to the Inlet
Pressure Tap.
5. Turn ON the main gas supply at the manual valve.
6. Check and adjust the incoming gas line pressure to
11.0-14.0 inches Water Column for LP/Propane gas.
7. Turn OFF the gas supply at the manual valve.
8. Disconnect the Manometer or pressure gauge.
9. Remove the NPT fitting and reinstall the INLET pressure
tap plug. Hand tighten the plug first to prevent cross-
threading. Tighten with 3/16 Allen wrench.
Lighting & Adjustment of the Appliance
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury 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.
1. Turn ON the manual gas valve, located on the outside
of the unit to the ON position.
2. Check all gas connections for leaks with a soap and
water solution. If the solution bubbles there is a gas
leak which must be corrected.
3. Turn on the electrical power to the appliance.
4. Turn the gas valve ON/OFF knob to the ON position.
See Figure 19 (page 20).
5. Set the thermostat to a point above room temperature
to begin the heating cycle of the furnace.
6. Check that the furnace ignites and operates properly.
Refer to the installation instructions provided with the
unit for the normal operating sequence.
7. After ignition, visually inspect the burner assembly to
ensure that the flame is drawn directly into the center of
the heat exchanger tube. In a properly adjusted burner
assembly, the flame color should be blue with some light
yellow streaks near the outer portions of the flame.
NOTE: The igniter may not ignite the gas until all air is bled
from the gas line. If the ignition control locks out, turn the
thermostat to its lowest setting and wait one minute then
turn the thermostat to a point above room temperature
and the igniter will try again to ignite the main burners.
This process may have to be repeated several times
before the burners will ignite. After the burners are lit,
check all gas connections for leaks again with the soap
and water solution.
Measuring the Manifold Pressure
The manifold pressure must be measured by installing a
pressure gauge (Manometer, Magnehelic Meter, etc.) to
the outlet end of the gas valve as follows:
1. Turn off all electrical power to the appliance.
2. Shut OFF the gas supply at the manual shutoff valve
located outside of the appliance.
3. Using a 3/16” Allen wrench, remove the manifold
pressure tap plug located on the outlet side of the gas
valve. See Figure 19 (page 20).
4. Install an 1/8” NPT pipe thread fitting, that is compatible
with a Manometer or similar pressure gauge.
5. Connect the Manometer or pressure gauge to the
manifold pressure tap.