5120410-XIM-B-0216
24 Johnson Controls Unitary Products
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followed in all cases unless superseded by local codes or gas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 19. 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
Figure 24: Bottom Entry Gas Piping
Table 17: Gas Heat Minimum Supply Air Imperial
Size
(Ton)
Model
Heat
Size
Supply Air (CFM)
Cooling Heating
Min Max Min Max
090
(7.5)
DC
10 2250 3750 2250 3750
15 2250 3750 2250 3750
120
(10)
DC
15 3000 5000 3000 5000
20 3000 5000 3000 5000
150
(12.5)
DC
15 3750 6250 3750 6250
20 3750 6250 3750 6250
Table 18: Gas Heat Minimum Supply Air Metric
Size
(KW)
Model
Heat
Size
Supply Air (M
3
S)
Cooling Heating
Min Max Min Max
090
(26)
DC
10 1.06 1.76 1.06 1.76
15 1.06 1.76 1.06 1.76
120
(35)
DC
15 1.42 2.36 1.42 2.36
20 1.42 2.36 1.42 2.36
150
(44)
DC
15 1.76 2.95 1.76 2.95
20 1.76 2.95 1.76 2.95
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