# 45465K005
Page 16
Electrical Wiring
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, per-
sonal injury, or loss of life.
WARNING
FIRE OR EXPLOSION HAZARD
Manual
Gas Valve
Union
Tee
Drip Leg
Cap
1/8" NPT
Plugged
Tapping
Manual
Gas Valve
Union
Tee
Drip Leg
Cap
1/8" NPT
Plugged
Tapping
Gas Connection
Upflow/Counterflow
Installation
Horizontal
Installation
Figure 22
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
(see Figure 22).
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.
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 pres-
sure may rupture the pressure regulator dia-
phragm and may cause overfiring of the burn-
ers and improper burner operation. The
overfiring may result in the creation of carbon
monoxide which could cause asphyxiation.
WARNING
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 prop-
erty damage, personal injury, or death.
WARNING
