Pressure Test Gas Piping - Lennox LHT078H Installation Instructions Manual

OUTSIDE OF UNIT GAS PIPE CONNECTION
GROUND
JOINT UNION
TO GAS
SUPPLY
GAS PIPING
SUPPORT
MANUAL MAIN
SHUT-OFF VALVE
FIGURE 9
BOTTOM ENTRY GAS PIPING
THROUGH THE CURB
MULLION BETWEEN
HEAT AND COMPRES­
SOR SECTIONS
4" NIPPLE
GROMMET
ALL ELBOWS ARE 3/4"
MANUAL MAIN
SHUT-OFF VALVE
TO GAS
SUPPLY
10" NIPPLE
ROOF
MOUNTING
FRAME
FIGURE 10
TO GAS
VALVE
DRIP LEG
(REFER TO
LOCAL CODES)
4" NIPPLE
TO GAS
VALVE
5" NIPPLE
7-1/2" NIPPLE
GROUND
JOINT UNION
4" NIPPLE
3-1/2" NIPPLE
3" NIPPLE
DRIP LEG
Page 10
BOTTOM GAS ENTRY
THROUGH THE UNIT
ALL ELBOWS ARE 3/4"
GROMMET
10" NIPPLE
7-1/2" NIPPLE
GROMMET
7" TO GAS
NIPPLE
SUPPLY
ALTERNATE
KNOCKOUTS
ROOF MOUNTING
FRAME
DRIP LEG
FIGURE 11
Pressure Test Gas Piping (Gas Units)
When pressure testing gas lines, the gas valve must
be disconnected and isolated. Gas valves can be
damaged if subjected to more than 0.5 psig (3.48kPa).
See figure 12.
NOTE-Codes may require that manual main shut-off
valve and union (furnished by installer) be installed in
gas line external to unit. Union must be of the ground
joint type.
After all connections have been made, check all piping
connections for gas leaks. Also check existing unit gas
connections up to the gas valve; loosening may occur
during installation. Use a leak detection solution or other
preferred means. Do not use matches candles or other
sources of ignition to check for gas leaks.
NOTE-In case emergency shut down is required, turn off
the main manual shut-off valve and disconnect main
power to unit. These devices should be properly labeled
by the installer.
MULLION BETWEEN
HEAT AND COMPRES­
SOR SECTIONS
5" NIPPLE
4" NIPPLE
4" NIPPLE
TO GAS
VALVE
GROUND
JOINT UNION
4" NIPPLE
MANUAL MAIN
SHUT-OFF VALVE
3-1/2" NIPPLE
3" NIPPLE