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Start- -up and Check- -out
1. Remove the plug from the Inlet Pressure Tap on gas valve
and install a manometer. (Fig. 5)
2. Open manual gas line valve to unit. Check for gas leaks
and correct as necessary. Check supply pressure, 11 in wc
recommended, (11 in wc minimum, 14 in wc maximum).
If not within these limitations DO NOT OPERATE
FURNACE, contact gas supplier.
3. Close manual gas line valve to unit, remove manometer and
replace inlet pressure tap plug.
Gas Valve Adjustments
1. With the gas valve switch in the OFF position, remove the
pressure tap plug from the outlet end of the valve, and con-
nect a "U" tube manometer to the pressure port (See Fig. 5).
2. Turn the gas valve switch to the ON position and restore
electrical power to unit. Cycle the main burner on and off
several times to stabilize the pressure regulator diaphragm.
This MUST be done before an accurate pressure reading
can be obtained.
3. With the main burner on, read the manometer. For appro-
priate reading, see Table 1. Turn pressure regulator adjust-
ing screw clockwise to increase or counterclockwise to de-
crease manifold pressure. Burner Input must not exceed
nameplate rating. Refer to Section "Checking Input Rate".
4. Turn gas valve to OFF. Remove the manometer and replace
the pressure tap plug and pressure regulator cap screw.
5. Start the main burners and check pressure tap plug for gas
leaks.
6. With gas valve on, observe furnace through two or more
complete cycles to be sure all controls are operating.
Checking Input Rate
High Altitude Input Rate =
*
Nameplate Sea Level Input Rate x (Multiplier)
Elevation
0' - 2000'
(0 - - 610 M)
2001' - 3000'
(610 - - 914 M)
3001' - 4000'
(914 - - 1219 M)
4001' - 5000'
(1219 - - 1524 M)
5001' - 6000'
(1524 - - 1829 M)
6001' - 7000'
(1829 - - 2134 M)
7001' - 8000'
(2134 - - 2438 M)
* Based on mid---range of elevation.
Table 3 – Input Rate Multiplier
High Altitude Multiplier
Propane Gas*
1.00
0.90
0.86
0.82
0.78
0.74
0.70
Main Burner Flame Check
Check for the following: (See Fig. 8)
S Stable and blue flames. Dust may cause orange tips or wisps of
yellow, but flames MUST NOT have solid, yellow tips.
S Flames extending directly from burner into heat exchanger.
S Flames do NOT touch sides of heat exchanger.
If any problems with main burner flames are noted, it may be
necessary to adjust gas pressures or check for drafts.
Fig. 8 - - Main Burner
High Altitude Derated Unit Label
The derated label supplied with the conversion kit must be
completed and affixed to the furnace near the rating plate. Fill in
the manifold pressure, orifice size and revised input rate.
Refer to Table 1 provided to determine the manifold pressure and
proper orifice part numbers.
Verify System Operation
Upon completion of all conversion procedures, perform the
following steps to attach the appropriate labels and verify the
system operation.
1. Locate the Propane Gas Conversion Label next to the
furnace rating plate.
2. Fill out and attach the Field Conversion Label to the front
exterior of the furnace.
3. Turn the thermostat to its lowest temperature setting or to
OFF if equipped with a System Select Switch.
4. Turn the gas switch to ON.
5. Reinstall all access panels.
6. Turn ON all electrical power to the unit.
7. Set the thermostat to the desired temperature and the System
Select Switch to HEAT.
8. Observe unit operation through two (2) complete heating
cycles. See "Sequence of Operation" in furnace intallation
instructions.
5
Burner Face
A07734
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