349215-JIM-B-1008
14 Johnson Controls Unitary Products
OPTIONAL GAS HEAT
These gas-fired heaters have aluminized-steel or
optional stainless steel, tubular heat exchangers with
spark ignition with proven pilot.
All gas heaters are shipped from the factory equipped
for natural gas use, but can be field converted to L.P./
Propane with Kit Model # 1NP0418. See Gas Heat
Application Data Table.
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unless superseded by local codes or gas utility require-
ments. Refer to the Pipe Sizing Table 5.
The heating value of the gas may differ with locality.
The value should be checked with the local gas utility.
NOTE: There may be a local gas utility requirement
specifying a minimum diameter for gas piping.
All units require a one-inch pipe connection at
the entrance fitting.
Maximum capacity of pipe in cubic feet of gas per hour. (Based upon
a pressure drop of 0.3 inch water column and 0.6 specific gravity
gas).
TABLE 3: ELECTRIC HEAT APPLICATION DATA
NOMINAL
HEATER SIZE
(KW)
VOLTAGE
3-PHASE,
60 HZ
MINIMUM CFM UNIT SIZE
15 TON 17.5 TON 20 TON 25 TON
18 208/230,460,575 4500
6000 6000 7500
36 208/230,460,575 4500
54
208/230 5000
460,575 4500
72
208/230 5000
460,575 4500
TABLE 4: GAS HEAT APPLICATION DATA
0 To
2,000 Feet
Above
Sea Level
2,000 To
4,500 Feet
Above
Sea Level
Output Capacity (Mbh)
Available
on Models
Gas
Rate
(Ft./Hr.)
Temp .
Rise ºF
At
Full Input
1
0 To
2,000 Feet
Above
Sea Level
2,000 To
4,500 Feet
Above
Sea Level
Max. Min. Max. Min. Max. Max. Min. Max.
300 150 270 135 240 213 15, 17.5, 20 & 25 Ton 279 20 50
400 200 360 180 320 281 15, 17.5, 20 & 25 Ton 372 30 60
1.
On VAV units, individual VAV boxes must be full open in heating mode to insure airflow falls within
temperature rise range.
TABLE 5: PIPE SIZING
Length in Feet
Nominal Iron Pipe Size
1 in. 1-1/4 in.
10 520 1,050
20 350 730
30 285 590
40 245 500
50 215 440
60 195 400
70 180 370
80 170 350
90 160 320
100 150 305
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