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be followed in all cases unless superseded by local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 Table
17. 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
Note:
Routing of gas piping must not interfere
with the flue or heat compartment access.
Table 17: Gas Pipe Sizing - Capacity of Pipe
Nominal Iron Pipe Size
Length of Pipe (ft.)
3/4 in.
1 in.
1-1/4 in.
10
278
520
1050
20
190
350
730
30
152
285
590
40
130
245
500
50
115
215
440
60
105
195
400
70
96
180
370
80
90
170
350
90
84
160
320
100
79
150
305
Note:
Maximum capacity of pipe in cubic feet
of gas per hour based upon a pressure drop of
0.3 inch W.C. and 0.6 specific gravity gas.
Note:
There may be a local gas utility
requirement specifying a minimum diameter
for gas piping. Units require either a 1/2 or 3/4
inch pipe connection at the entrance fitting.
Line should not be sized smaller than the
entrance fitting size.
Table 18: Gas Heat Supply Air
Supply Air (CFM)
Heating
Model
(Size)
Gas Heat
Description
Opt.
Min
Max
Low
D
1790
3050
Med
E
1800
3020
ZXA7
(6)
High
F
1790
2980
Low
D
2260
3700
Med
E
2260
3700
ZX08
(7.5)
High
F
2260
3790
Low
D
2570
4210
Med
E
2560
4300
ZX09
(8.5)
High
F
2550
4290
Low
D
3030
4940
Med
E
3020
4940
ZX12
(10)
High
F
2990
5010
Low
D
3700
6350
Med
E
3790
6270
ZX14
(12.5)
High
F
3780
6170
Gas Connection
The gas supply line can be routed within the space
and roof curb, exiting through the unit’s basepan.
Refer to Figure 12 thru Figure 14 for the gas piping
inlet location. Typical supply piping arrangements
are shown in Figure 23. All pipe nipples, fittings, and
the gas cock are field supplied.
Gas piping recommendations:
1. A drip leg and a ground joint union must be
installed in the gas piping.
2. Where required by local codes, a manual shut-
off valve must be installed outside of the unit.
3. Use wrought iron or steel pipe for all gas lines.
Pipe dope should be applied sparingly to male
threads only. If local codes allow the use of a
flexible gas appliance connector, always use a
new listed connector. Do not use a connector
which has previously serviced another gas
appliance.
INSTALLATION MANUAL ZX SERIES 6 - 12.5 Ton 60 Hertz R-410A
54
Johnson Controls Ducted Systems
Содержание ZX Series
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