5725848-XIM-A-0319
Johnson Controls Ducted Systems
13
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. See Gas Heat Application Data Table.
For natural gas heating installations in locations requiring low
NOx emissions, Accessory model 1LN0406 must be used.
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followed in all cases unless superseded by local codes or gas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 4.
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
½” pipe connection at the entrance fitting.
Gas connection
The gas supply line can be routed through the knockouts
located on the front of the unit or through the opening provided
Table 2: Electric heater supply air limitations
UNIT MODEL SIZE
NOMINAL TONS
VOLTAGE
MINIMUM SUP-
PLY AIR
HEATER SIZE NOMINAL KW
7
10
15
20
30
3
380/415-3-50
M
3
/S
0.47
0.57
0.57
0.61
-
CFM
1100
1200
1200
1300
-
4
380/415-3-50
M
3
/S
0.61
0.61
0.61
0.61
-
CFM
1300
1300
1300
1300
-
5
380/415-3-50
M
3
/S
0.75
0.75
0.75
0.75
0.75
CFM
1600
1600
1600
1600
1600
6.3
380/415-3-50
M
3
/S
0.85
0.85
0.85
0.85
0.85
CFM
1800
1800
1800
1800
1800
Table 3: Gas heat application data
GAS HEAT
OPTION
INPUT CAPACITY
kW[MBH]
OUTPUT CAPACITY
kW[MBH]
AVAILABLE ON
MODELS
GAS RATE
1
M
3
/
S[Ft
3
/Hr]
TEMPERTURE RISE ºC[°F] AT FULL INPUT
2
MIN.
MAX.
H05
15[50]
12[40]
3 TON
0.02[47]
8[15]
25[45]
H07
22[75]
18[60]
4 TON
0.03[70]
14[25]
31[55]
H10
29[100]
23[79]
5/6 TON
0.04[93]
14[25]
31[55]
1.
Based on 1075 Btu/Ft
3
.
2. The air flow must be adjusted to obtain a temperature rise within the range shown.
NOTE:
Gas Heaters are shipped available for natural gas, but can be converted to L.P. with Kit Model No. 1NP0434.
All furnaces meet the latest California seasonal efficiency requirements.
Table 4: Gas pipe sizing
LENGTH IN
M[FT]
NOMINAL IRON PIPE SIZE
12.7mm
[1/2 in.]
19.0mm
[3/4 in.]
25.0mm
[1 in.]
32.0mm
[1-1/4 ]in.
3[10]
3.74[132]
7.87[278]
14.72[520)
29.72[1050]
6[20]
2.60[92]
5.38[190]
9.91[350]
20.66[730]
9[30]
2.07[73]
4.3[152]
8.07[285]
16.70[590]
12[40]
1.78[63]
3.68[130]
6.93[245]
14.15[500]
15[50]
1.58[56]
3.25[115]
6.08[215]
12.45[440]
18[60]
1.42[50]
2.97[105]
5.52[195]
11.32[400]
21[70]
1.30[46]
2.72[96]
5.09[180]
10.47[370]
24[80]
1.22[43]
2.55[90]
4.81[170]
9.91[350]
27[90]
1.13[40]
2.38[84]
4.53[160]
9.06[320]
30[100]
1.08[38]
2.23[79]
4.25[150]
8.63[305]
Maximum capacity of pipe in cubic meter/cubic feet of gas per
hour. (Based upon a pressure drop of 7.62mm/0.3 inch water
column and 0.6 specific gravity gas).
