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5803641-JIM-B-0620
Optional Gas Heat
These gas-fired heaters have aluminized-steel or optional
stainless steel, tubular heat exchangers with spark ignition.
Gas Piping
Proper sizing of gas piping depends on the cubic feet per hour
of gas flow required, specific gravity of the gas and the length of
run. "National Fuel Gas Code" Z223.1 (in U.S.A.) or the current
Gas Installation Codes CSA-B149.1 (in Canada) should be
followed in all cases unless superseded by local codes or gas
utility requirements. Refer to the Pipe Sizing Table 12. The
heating value of the gas may differ with locality. The value
should be checked with the local gas utility.
Figure 23: Side Entry Gas Piping
26
OPTIONAL
COIL
GUARD
Figure 24: Bottom Entry Gas Piping
SHOWN
Table 12: Gas Pipe Sizing - Capacity of Pipe
Length of
NOTE: Maximum capacity of pipe in cubic feet of gas per hour
NOTE: There may be a local gas utility requirement specifying a
Nominal Iron Pipe Size
Pipe (ft.)
3/4 in.
10
278
20
190
30
152
40
130
50
115
60
105
70
96
80
90
90
84
100
79
based upon a pressure drop of 0.3 inch W.C. and 0.6
specific gravity gas.
minimum diameter for gas piping. All units require a 3/4
inch pipe connection at the entrance fitting. Line should
not be sized smaller than the entrance fitting size.
Johnson Controls Ducted Systems
OPTIONAL
COIL
GUARD
SHOWN
1 in.
1-1/4 in.
520
1050
350
730
285
590
245
500
215
440
195
400
180
370
170
350
160
320
150
305
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