Optional Gas Heat; Gas Application Data; Gas Pipe Sizing - Capacity Of Pipe; Gas Heat Minimum Supply Air Imperial - York ZF 180 Series Installation Manual

1061903-XIM-A-0713

Optional Gas Heat

These gas-fired heaters have aluminized-steel or optional
stainless steel, tubular heat exchangers with spark ignition with
proven pilot.
Table 13: Gas Application Data
Unit Input
Size Opt. (MBH)
24
180
32
24
240
32
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followed in all cases unless superseded by local codes or gas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 16: External Supply Connection External Shut-Off
20
Temp Rise
Output (MBH)
300 240
400 320
300 240
400 320
Drip Leg
(°F)
20-50
30-60
20-50
30-60
Figure 17: Bottom Supply Connection External Shut-Off
Table 14: 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.
Table 15: Gas Heat Minimum Supply Air Imperial
Size
(Tons)
180
(15)
240
(20)
Table 16: Gas Heat Minimum Supply Air Metric
Size
(Tons)
180
(15)
240
(20)
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)
Supply Air (CFM)
Heat Size Cooling
Min Max
24 4500 7000
32 4500 7000
24 6000 9400
32 6000 9400
Supply Air (M
Heat Size Cooling
Min Max
24 2.13 3.3
32 2.13 3.3
24 2.83 4.44
32 2.83 4.44
Johnson Controls Unitary Products
Main
Manual
Shut-off
Valve
Heating
Min Max
4500 7000
4500 7000
6000 9400
6000 9400
3
/S)
Heating
Min Max
2.13 3.3
2.13 3.3
2.83 4.44
2.83 4.44