17
NOTE
: Gas valve regulator seal cap MUST be in place when
checking input rate.
5. When correct input is obtained,main burner flame should
be clear blue, almost transparent. Be sure regulator seal
cap is in place when finished. See Fig. 15.
6. Remove jumper across R and W thermostat connections to
terminate call for heat.
7. Turn furnace gas valve control switch or control knob to
OFF position.
8. Turn off furnace power supply.
9. Remove manometer and replace manifold pressure tap
plug.
NOTE
: Use propane--gas--resistant pipe dope to prevent gas
leaks. DO NOT use Teflon tape.
10. Turn furnace gas valve control switch or control knob to
ON position.
11. Turn on furnace power supply. Set room thermostat to call
for heat.
12. Check manifold pressure tap plug for gas leaks when main
burners ignite.
13. Observe unit operation through 2 complete heating cycles.
14. See Sequence of Operation in furnace Installation, Start--
up and Operating Instructions.
15. Set room thermostat to desired temperature.
After making the required manifold pressure adjustments, check
and adjust the furnace temperature rise per the furnace installation
instructions.
CHECK LOW GAS PRESSURE SWITCH
The newly installed low gas pressure switch is a safety device
used to guard against adverse burner operating characteristics that
can result from low gas supply pressure. Switch opens at not less
than 7.2 in. W.C. and closes at not greater than 10.2 in. W.C.
This switch also prevents operation when the propane tank level
is low which can result in gas with a high concentration of
impurities, additives, and residues that have settled to the bottom
of the tank. Operation under these conditions can cause harm to
the heat exchanger system. This normally open switch closes
when gas is supplied to gas valve under normal operating
pressure.
The closed switch completes control circuit. Should an
interruption or reduction in gas supply occur, the gas pressure at
switch drops below low gas pressure switch setting, and switch
opens. Any interruption in control circuit (in which low gas
pressure switch is wired) quickly closes gas valve and stops gas
flow to burners. When normal gas pressure is restored, the system
must be electrically reset to re--establish normal heating operation.
Before leaving installation, observe unit operation through 2
complete heating cycles. During this time, turn gas supply to gas
valve off just long enough to completely extinguish burner flame,
then instantly restore full gas supply. To ensure proper low gas
pressure switch operation, observe that there is no gas supply to
burners until after hot surface igniter begins glowing.
LABEL APPLICATION
1. Fill in Conversion Responsibility Label 339852--205 (see
Fig. 32) and apply to Blower Access Door of furnace as
shown. Date, name, and address of organization making
this conversion are required.
2. Attach Conversion Rating Plate Label 339852--204 to
Outer Door of furnace.
3. Apply Gas Control Conversion Label to gas valve:
339852--202 to gas valve. (Do not use 339852--203,
which is similar.)
CHECKOUT
1. Observe unit operation through 2 complete heating cycles.
2. See Sequence of Operation operation in furnace Installa-
tion, Start--Up, and Operating Instructions.
3. Set room thermostat to desired temperature.
A13058
Fig. 32 -- Conversion Responsibility Label
