Page 6 of 19
507388-03
Issue 2127
If a flexible gas connector is required or allowed by
the authority that has jurisdiction, black iron pipe shall
be installed at the gas valve and extend outside the
furnace cabinet. The flexible connector can then be
added between the black iron pipe and the gas supply
line.
CAUTION
Compounds used on threaded joints of gas piping must
be resistant to the actions of liquefied petroleum gases.
IMPORTANT
Never use a flame to check for gas leaks. Explosion
causing injury or death may occur.
CAUTION
A manual shutoff valve must be located outside the unit.
The use of a union located upstream of the controls is
recommended, between the controls, and the manual
shutoff valve. This will facilitate removal of controls and
manifold. See Figure 3 for recommended placement of the
union.
Provide a drip leg in the supply piping located exterior
to the unit. Piping connections must be sealed with non-
hardening pipe joint compound resistant to propane.
The furnace must be isolated from the gas supply piping
system by closing the individual manual shutoff valve
during any pressure testing of gas supply piping system
at test pressures equal to or less than 1/2 psig or 14”
W.C. If the piping system is to be tested at pressures in
excess of 1/2 psig, the furnace and its individual shutoff
valve must be disconnected from the gas supply piping
system. The gas valve supplied with this furnace is
rated at 1/2 psig. Any higher pressure may rupture the
pressure regulator diaphragm which will cause over-
firing of the burners and improper burner operation.
This action may produce a high concentration of carbon
monoxide which can result in asphyxiation.
WARNING
Figure 3. Gas Supply Piping
Leak Check
After gas piping is completed, carefully check all piping
connections (factory and field installed) for gas leaks. Use
a leak detecting solution or other preferred means.
NOTE:
If emergency shutoff is necessary, shut off the main
manual gas valve and disconnect the main power to the
furnace. The installer should properly label these devices.
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 other sources of ignition to check for
gas leaks.
CAUTION