START-UP
Do not purge gas supply into the combustion chamber.
Do not use a match or other open flame to check for gas
leaks. Use a soap-and-water solution and check all gas
piping for leaks. Failure to observe these warnings could
result in an explosion causing personal injury or death.
Make certain that the gas supply pipe has been purged
and all gas piping has been checked for leaks before starting
the unit.
Adjusting Gas Input — The original gas valve is quali-
fied to operate on propane gas, but the regulator must be
adjusted for proper unit operation. See Table 3 for proper
gas pressures and inputs.
The burner orifices from the kit are sized for the correct
gas input when the heating value of the propane gas is
2500 Btu/cu ft with a specific gravity of 1.5 in. wg at a
manifold pressure of 10.5 in. wg. (The propane gas supply
pressure minimum is 11.0 in. wg, and the maximum is
13.6 in. wg.) Use a water manometer to measure the mani-
fold pressure. If a spring manometer is used, make sure the
manometer is calibrated.
Proceed as follows to measure and set the manifold
pressure:
1. Turn off gas supply and then electrical power to the unit.
2. Remove pressure tap plug on burner manifold and con-
nect manometer to unit. See Fig. 1 and 2.
3. Turn on electric power and gas to unit.
4. Set unit control to call for heat.
5. Using pilot adjustment screw, adjust pilot until it is a soft
blue flame fully engulfing the sensor.
6. With unit operating and all burners fired, adjust manifold
adjustment screw on gas valve (See Fig. 19 and 20) for
10.5 in. wg. Turn screw clockwise to increase pressure,
or counterclockwise to decrease pressure.
7. Turn off gas and then electrical power to unit.
8. Remove manometer and replace plug in pressure tap.
9. Install cover screw on gas valve.
Checkout Procedure — Proceed as follows to test
the newly installed propane gas system operation:
1. Turn on gas to the unit.
2. Check for normal operation of the ignition system, in-
cluding pilot operation. Adjust pilot pressure if required.
See Fig. 19 and 20.
3. Observe that the flames on each burner are light blue and
‘‘soft’’ in appearance, and that the flames are approxi-
mately the same for each burner.
If the gas supply pressure falls below the set point of the
pressure switch (approximately 5.5 in. wg), the gas valve
will close and shut off gas supply to the unit. Determine the
cause of low gas supply pressure and correct the condition.
Before leaving the installation, a complete operating cycle
should be observed to ensure all components are function-
ing properly.
LEGEND
C—Contactor
MGV — Main Gas Valve
PGV — Pilot Gas Valve
QC — Quick Connect
THD — Thread
NOTE: All dimensions are in inches.
Fig. 19 — 48DJD,DKD,FJD,FKD,FPD,JJD,JKD,JPD,NPD034-048 Low Heat (2-Stage) Valve
11
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