Lennox B050A3B, Installation/Servicing Instructions And Users Information Manual

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506307-01 Page 15 of 36 Issue 1207
GAS CONTROL PIPING
Figure 6
TYPICAL GAS SERVICE CONNECTION
GAS SUPPLY
FIELD SUPPLIED MAIN
MANUAL SHUT-OFF
VALVE
DRIP LEG
F0000316
TYPICAL GAS SERVICE CONNECTION
Figure 7B
Figure 7A
This furnace is manufactured for use with natural gas
and must be converted using the proper LP concersion kit
for use with LP (Propane) gas. For LP (Propane) gas, a
tank requlator is required to reduce supply pressure to 12”-
13” w.c. For manifold pressure see Table 5.
A main manual shut off valve must be used in the gas
piping. The shut off type and location must follow local codes
and should always be in an accessible but protected location.
In the absence of local codes the recommended methods
for installing the gas piping to the furnace are shown in
Figures 6 and 7.
The gas valve contains two threaded ports for a 1/8”
NPT tap in order to test incoming gas pressure and outgoing
manifold pressure (See Figure 9).
FIELD SUPPLIED MAIN
MANUAL SHUT-OFF
VALVE
GAS SUPPLY
DRIP LEG
F0000317
Many soaps used for leak testing are corrosive to certain
metals. Piping must be rinsed thoroughly with clean water
after leak check has been completed.
CAUTION
This furnace may be field reversed allowing for a left to
right airflow instead of the factory positioned right to left air
flow (See Figures 8A and B). Field reversal is accomplished
by inverting the furnace so that the “top” panel is down.
FIELD REVERSED
Figure 8A
STANDARD
Figure 8B
Field Reversal:
Before proceeding with field reversal, insure that all
electrical power is turned OFF and that all gas piping is
shut OFF and disconnected from the furnace. Failure to
do so could result in an extremely hazardous condition
and bodily harm.
WARNING
BLOWER ACCESS
F0000312
AIR FLOW
BLOWER ACCESS
F0000311
AIR FLOW
Never use an open flame when testing for gas leaks!
Use of an open flame could lead to a fire or explosion.
WARNING