ACAUTION
AWARNING
klMPORTANT
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
figures 50 and 51,
2 - When connecting gas supply, factors such as length of
run, number of fittings and furnace rating must be con-
sidered to avoid excessive pressure drop. Table 9 lists
recommended pipe sizes for typical applications,
NOTE - Use two wrenches when connecting gas pip-
ing 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 eleva-
tor shafts. Center gas line through piping hole. Gas
line should not touch side of unit, See figures 50 and
51.
4 - Piping should be sloped 1/4 inch per 15 feet (6mm per
5.6m) upward toward the gas meter from the furnace,
The piping must be supported at proper intervals, ev-
ery 8 to 10 feet (2.44 to 3.05m), 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.
See figures 58 and 59,
6 - In some localities, codes may require installation of a
manual main shut-off valve and union (furnished by in-
staller) external to the unit, Union must be of the
ground joint type.
MANUAL MAIN SHUT-OFF
VALVE WILL NOT HOLD --
NORMAL TEST PRESSURE t
CAP -------_3
FURNACE
ISOLATE
GAS VALVE
FIGURE 49
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 less
than or equal to 1/2 psig (3.48 kPa, 14 inches w.c.).
klMPORTANT
Upflow Application AUTOMATIC
Left Side Piping GASVALVE
(Standard) {with manual
shut-off valve)
MANUAL
MAIN SHUT-OFF r
VALVE
GROUND
JOINT
UNION
+
DRIP LEG
r
FIELD
PROVIDED
AND INSTALLED
!
. WARNING
Upflow Application
Right Side Piping
(Alternate)
MANUAL
MAIN SHUT-OFF
VALVE
JOINT
UNION
DRIP LEG
FIGURE 50
Page 32
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