Optional Gas Heat; Gas Heat Application Data; Gas Pipe Sizing - Capacity Of Pipe - York DC180 Installation Manual

5120416-XIM-C-0216

Optional Gas Heat

These gas-fired heaters have aluminized-steel or optional stainless steel, tubular heat exchangers with spark ignition with proven
pilot.
Table 8: Gas Heat Application Data
0 To
2,000 Feet 4,500 Feet
Above
Sea Level Sea Level
Max. Min. Max.
300 150 270
350 175 320
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followed in all cases unless superseded by local codes or gas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 13. 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.
Main
Manual
Shut-off
Valve
Figure 15: External Supply Connection External Shut-Off
20
Output Capacity (Mbh)
2,000 To
0 To
2,000 Feet
Above
Above
Sea Level
Min. Max.
135 240
160 280
Drip Leg
2,000 To
4,500 Feet Available
Above on Models
Sea Level
Max.
213 15, 20 & 25 Ton
241 25 Ton
Figure 16: Bottom Supply Connection External Shut-Off
Table 9: Gas Pipe Sizing - Capacity of Pipe
Length of
Pipe ft. (m)
10 (3)
20 (6)
30 (9.1)
40 (12.1)
50 (15.2)
60 (18.2)
70 (21.3)
80 (24.3)
90 (27.4)
100 (30.4)
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.
Gas Connection
The gas supply line can be routed within the space and roof curb,
exiting through the unit's basepan. Refer to Figure 5 for the gas
piping inlet location. Typical supply piping arrangements are
Gas
Rate
(Ft./Hr.)
Min.
279 20
326 30
Drip Leg
Nominal Iron Pipe Size
1 in. 1-1/4 in.
520 (14.7) 1050 (29.7)
350 (9.9) 730 (20.6)
285 (8) 590 (16.7)
245 (6.9) 500 (14.1)
215 (6) 440 (12.4)
195 (5.5) 400 (12.4)
180 (5) 370 (10.4)
170 (4.8) 350 (9.9)
160 (4.5) 320 (9)
150 (4.2) 305 (8.6)
Johnson Controls Unitary Products
Temp.
Rise ºF
At
Full Input
Max.
50
60
Main
Manual
Shut-off
Valve