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39Part number 550-141-850/0699
• Installation • Start-Up • Parts • Maintenance
Outlet hex
fitting
Manifold
Service
valve
(by others)
Ground joint
union
(by others)
½" NPT
Nipple length must provide
at least 3 inches between
the cap and tee, per ANSI
Z223.1.
Drip leg
(by others)
Blower housing
cover
Blower housing
cover
Gas valve
Gas valve
Always use a wrench on the manifold to
prevent it from twisting when installing or
removing external gas piping. Failure to do
so could damage the blower housing
assembly, resulting in a leakage of
Gas valve outlet hex fitting is a LEFT-
HAND thread.
85031
Figure 17 Gas supply connection to GV
boiler gas manifold
Gas pipe
length
(feet)
Capacity of pipe for pipe size of:
(Capacity in cubic feet gas per hour)
½" ¾" 1" 1¼" 1½"
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 860
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 150 305 460
150 31 64 120 250 380
Table 3 Pipe capacity for 0.60 specific
gravity natural gas