507206-01
Page 35 of 59
Issue 1337
Gas Piping
1. Gas piping may be routed into the unit through either
the left or right hand side. Supply piping enters into the
gas valve from the side of the valve as shown in Figure
50. Move bellows grommet to side of the cabinet which
the gas line enters. Ensure opposite gas line entrance
is plugged with supplied plug.
Do Not
exceed 600 in. lbs. (50 ft. lbs.) torque when
attaching the gas piping to the gas valve.
WARNING
If a flexible gas connector is required or allowed by the
authority that thas 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
2. When connecting gas supply, factors such as length
of run, number of fittings and furnace rating must be
considered to avoid excessive pressure drop. Table 10
lists recommended pipe sizes for typical applications.
NOTE:
Use two wrenches when connecting gas piping to
avoid transferring torque to the manifold.
3. Gas piping must not run in or through air ducts, clothes
chutes, chimneys or gas vents, dumb waiters or elevator
shafts. Center gas line through piping hole. Gas line
should not touch side of unit. See Figures 50.
4. Piping should be sloped 1/4 inch per 15 feet (6 mm per
5.6 m) upward toward the gas meter from the furnace.
The piping must be supported at proper intervals, every
8 to 10 feet (2.44 to 3.05 m), using suitable hangers or
straps. Install a drip leg in vertical pipe runs to serve
as a trap for sediment or condensate.
5. A 1/8” N.P.T. plugged tap or pressure post is located on
the gas valve to facilitate test gauge connection.
6. In some localities, codes may require installation of a
manual main shut off valve and union (furnished by
installer) external to the unit. Union must be of the
ground joint type.
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.
The furnace must be isolated from the gas supply system
by closing its individual manual shut off valve during any
pressure testing
of
the gas supply system at pressures
greater than or equal to 1/2 psig
(3.48
kPa,
14
inches w.c.).
Compounds used on threaded joints of gas piping must
be resistant to the actions of liquified petroleum gases.
IMPORTANT
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could
result in serious injury, death, or property damage.
Never use an open flame to test for gas leaks. Check
all connections using a commercially available soap
solution made specifically for leak detection. Some
soaps used for leak detection are corrosive to certain
metals. Carefully rinse piping thoroughly after leak test
has been completed.
WARNING
When testing pressure of gas lines, gas valve must
be disconnected and isolated. Gas Valves can be
damaged if subjected to pressures greater than 1/2
psig (3.48 kPa).
IMPORTANT
A low inlet pressure switch in LP/propane applications
is recommended.
IMPORTANT
Figure 49
Summary of Contents for 95G2DFE
Page 3: ...507206 01 Page 3 of 59 Issue 1337 Figure 1 ...
Page 17: ...507206 01 Page 17 of 59 Issue 1337 A95DF2E 95G2DFE Table 7A ...
Page 18: ...507206 01 Page 18 of 59 Issue 1337 A95DF2E 95G2DFE Table 7B ...
Page 19: ...507206 01 Page 19 of 59 Issue 1337 A95DF2E 95G2DFE Table 7C ...
Page 27: ...507206 01 Page 27 of 59 Issue 1337 Figure 32 ...
Page 34: ...507206 01 Page 34 of 59 Issue 1337 Figure 48 TRAP DRAIN ASSEMBLY USING 1 2 PVC or 3 4 PVC ...
Page 36: ...507206 01 Page 36 of 59 Issue 1337 Figure 50 Table 10 ...
Page 40: ...507206 01 Page 40 of 59 Issue 1337 TYPICAL WIRING DIAGRAM Figure 54 ...
Page 56: ...507206 01 Page 56 of 59 Issue 1337 Start UP Performance Check List ...
