Lennox Allied Air A95UH1D Installation Instructions Manual page 40

IMPORTANT
When testing pressure of gas lines, gas valve must be
disconnected and isolated. See Figure 60. Gas valves
can be damaged if subjected to pressures greater than
1/2 psig (3.48 kPa).
Page 40 of 60
Failure to follow the safety warnings exactly could
result in serious injury, death, or property damage.
Never use an open flame to test for gas leaks. Check
all connections using a commercially available soap
solution made specifically for leak detection. Some
soaps used for leak detection are corrosive to certain
metals. Carefully rinse piping thoroughly after leak test
has been completed.
Figure 61. Gas Piping
Upflow Applications
Figure 62. Gas Piping
Horizontal Applications
Issue 1917
WARNING
FIRE OR EXPLOSION HAZARD
507270-03