# 47860A005 Page 19
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 should
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. A test
gauge connection must be installed with a 1/8" NPT
plugged tapping immediately upstream of the shutoff valve
(refer to Figure 30).
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.
Failure to follow the safety warnings exactly
could result in serious injury, death, or prop-
erty 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
FIRE OR EXPLOSION HAZARD
Gas Piping Connection
Figure 30
Manual
Gas Valve
Union
Te e
Drip Leg
Cap
1/8" NPT
Plugged
Tapping
Upflow
Installation
Horizontal
Installation
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 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.
Electrical Wiring
Risk of electrical shock. Disconnect electrical
power at the circuit breaker or service panel
before making electrical connections. Failure
to disconnect power supplies can result in
property damage, personal injury, or death.
WARNING
The gas valve supplied with this furnace is
rated at 1/2 psig maximum. Any higher pres-
sure may rupture the pressure regulator
diaphragm and may cause overfiring of the
burners and improper burner operation. The
overfiring may result in the creation of carbon
monoxide which could cause asphyxiation.
WARNING
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