Page 14 of 21
507858-01
Issue 1922
at test pressure equal to or less than 1/2 psig (3.5 kPa) or
14” W.C. If the piping system is to be tested at pressures in
excess of 1/2 psig (3.5 kPa), the furnace and its appliance
main gas valve must be disconnected from the gas supply
piping system.
After gas piping is complete, carefully check all piping
connections (factory and field) for gas leaks. Use a leak
detecting solution or other preferred means. Some soaps
used for leak detection are corrosive to certain metals.
Carefully rinse piping thoroughly after leak detection has
been completed.
The gas valve supplied with this furnace is rated at 1/2
psig maximum. Any higher pressure may rupture the
pressure regulator diaphragm and may cause over-
firing of the burners and improper burner operation. The
over-firing may result in the creation of carbon monoxide
which could cause asphyxiation.
WARNING
Fire or Explosion Hazard
Failure to follow the safety warnings exactly could result
in serious injury, death, or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A
fire or explosion may result causing property damage,
personal injury, or loss of life.
WARNING
Figure 7.
Gas Supply Piping
Return
Supply
Drip Leg (Field Supplied)
Ground Joint Union (Field Supplied)
Condensate Drain
Access Panel to
Compressor and
Outdoor Fan
Access Panel to
Gas Valve and Burners
Access Panel
to Controls
Manual Shutoff Valve with 1/8”
NPT Plugged Tapping; Accessible
for Test Gauge Connection
(Field Supplied)
Filter
Access
Any conversion of a natural gas unit to propane gas
must be done by qualified personnel using a conversion
kit available from the manufacturer, following the
instructions in the conversion kit. If done improperly,
over-firing of the burners and improper burner operation
can result. This can create carbon monoxide which
could cause asphyxiation.
WARNING
Gas supply piping should be installed in accordance with
local codes and the regulations of the utility. Piping must
be of adequate size to prevent undue pressure drop.
Consult the local utility or gas supplier for complete details
on special requirements for sizing gas piping.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use
a connector which has previously serviced another gas
appliance.
Pipe connections must be tight, and a non-hardening pipe
compound resistant to liquefied petroleum gases must be
used.
Connect the gas pipe to the furnace controls providing a
ground joint union as close to the controls as is possible to
facilitate removal of controls and manifold. Provide a drip
leg on the outside of the furnace. A manual shutoff valve
shall be installed in the gas line, outside the unit, 5’ above
the floor, or in accordance with any local codes.
The furnace must be isolated from the gas supply piping
system by closing the individual manual shutoff valve
during any pressure testing of the gas supply piping system
