Page 8
FIGURE 8
TO GAS
SUPPLY
MANUAL MAIN
SHUT-OFF VALVE
GAS PIPING
SUPPORT
GROUND
JOINT UNION
(REFER TO
LOCAL CODES)
DRIP LEG
OUTSIDE OF UNIT GAS PIPE CONNECTION
TO GAS
VALVE
DRIP LEG
MANUAL MAIN
SHUT-OFF VALVE
GROUND
JOINT UNION
FIGURE 9
BOTTOM ENTRY GAS PIPING
THROUGH THE CURB
4” NIPPLE
TO GAS
SUPPLY
TO GAS
VALVE
ALL ELBOWS ARE 3/4”
5” NIPPLE
ROOF
MOUNTING
FRAME
4” NIPPLE
MULLION BETWEEN
HEAT AND COMPRES
SOR SECTIONS
3” NIPPLE
3-1/2” NIPPLE
4” NIPPLE
7-1/2” NIPPLE
10” NIPPLE
GROMMET
GROMMET
FIGURE 10
BOTTOM GAS ENTRY
THROUGH THE UNIT
DRIP LEG
MANUAL MAIN
SHUT-OFF VALVE
GROUND
JOINT UNION
4” NIPPLE
TO GAS
SUPPLY
TO GAS
VALVE
ALL ELBOWS ARE 3/4”
5” NIPPLE
ROOF MOUNTING
FRAME
4” NIPPLE
MULLION BETWEEN
HEAT AND COMPRES
SOR SECTIONS
3” NIPPLE
3-1/2” NIPPLE
7-1/2” NIPPLE
GROMMET
4” NIPPLE
10” NIPPLE
7”
NIPPLE
ALTERNATE
KNOCKOUTS
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 11.
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.
CAUTION
Some soaps used for leak detection are corrosive
to certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, flame or othe sources of ignition
to check for gas leaks.
