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OPTIONAL GAS HEAT
These gas-fired heaters have aluminized-steel or
optional stainless steel, tubular heat exchangers with
spark ignition with proven pilot.
TABLE 4: GAS HEAT APPLICATION DATA
0 To
2,000 To
2,000 Feet
4,500 Feet
Above
Sea Level
Sea Level
Max.
Min.
Max.
300
150
270
400
200
360
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unless superseded by local codes or gas utility require-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.
There may be a local gas utility requirement
NOTE:
specifying a minimum diameter for gas piping.
All units require a one-inch pipe connection at
the entrance fitting.
TABLE 5: PIPE SIZING
Length in Feet
10
20
30
40
50
60
70
80
90
100
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).
14
Output Capacity (Mbh)
0 To
2,000 Feet
Above
Above
Sea Level
Min.
Max.
135
240
180
320
Nominal Iron Pipe Size
1 in.
1-1/4 in.
520
1,050
350
730
285
590
245
500
215
440
195
400
180
370
170
350
160
320
150
305
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.
2,000 To
4,500 Feet
Available
Above
on Models
Sea Level
Max.
213
15, 20 & 25 Ton
281
15, 20 & 25 Ton
GAS CONNECTION
The gas supply line can be routed through the knock-
outs located on the front of the unit or through the
opening provided in the unit's base. Refer to the
Dimensions Figure 13 to locate these access open-
ings. Typical supply piping arrangements are shown in
the figures on page 15. All shaded items are field-sup-
plied.
If gas supply line is routed through the unit's base
ensure that the burner assembly can be removed for
maintenance without disturbing the supply line. The
supply piping and fittings must lie below the bottom gas
manifold to avoid interference with the burner assem-
bly.
Two grommets are shipped in the blower compartment
(in parts bag taped to the blower housing) of every unit
with gas heat and should be used in the knockouts
when the gas piping penetrates the front of the unit.
After the gas supply piping has been installed, the bot-
tom opening in the unit should be sealed to prevent
water from leaking into the building.
Gas piping recommendations:
1. A drip leg and a ground joint union must be
installed in the gas piping.
2. When required by local codes, a manual shut-off
valve may have to be installed outside of the unit.
3. Use wrought iron or steel pipe for all gas lines. Pipe
compound should be applied sparingly to male
threads only.
175244-BIM-A-0706
Temp.
Rise ºF
Gas
At
Rate
Full Input
(Ft./Hr.)
Min.
Max.
279
20
50
372
30
60
Unitary Products Group
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