York W)036 THRU 060 Specifications download pdf (Page 31)

542300-YIM-A-1009

Johnson Controls Unitary Products 31

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followed in all cases unless superseded by local codes or gas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 11. The

heating value of the gas may differ with locality. The value

should be checked with the local gas utility.

Figure 14: Side Entry Gas Piping

Figure 15: Bottom Entry Gas Piping

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. All units require a 1/2

inch pipe connection at the entrance fitting. Line should

not be sized smaller than the entrance fitting size.

Gas Connection

The gas supply line can be routed within the space and roof

curb, exiting through the unit’s basepan. Refer to Figure 6 for

the gas piping inlet locations. Typical supply piping

arrangements are shown in Figures 14 and 15. All pipe nipples,

fittings, and the gas cock are field supplied or may be

purchased in UP accessory kit #1GP0401.

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.

4. All piping should be cleaned of dirt and scale by

hammering on the outside of the pipe and blowing out

loose particles. Before initial start-up, be sure that all gas

lines external to the unit have been purged of air.

5. The gas supply should be a separate line and installed in

accordance with all safety codes as prescribed under

“Limitations”.

6. A 1/8-inch NPT plugged tapping, accessible for test gage

connection, must be installed immediately upstream of the

gas supply connection to the unit.

7. After the gas connections have been completed, open the

main shut-off valve admitting normal gas pressure to the

mains. Check all joints for leaks with soap solution or other

material suitable for the purpose. NEVER USE A FLAME.

Table 11: Gas Pipe Sizing - CapacIty of Pipe

Length of

Pipe (ft.)

Nominal Iron Pipe Size

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

Natural gas may contain some propane. Propane is an

excellent solvent and will quickly dissolve white lead and

most standard commercial compounds. A special pipe

dope must be used when assembling wrought iron or

steel pipe. Shellac based compounds such as Gaskolac

or Stalastic, and compounds such as Rectorseal #5,

Clydes’s or John Crane may be used.

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York W)036 THRU 060 Specifications Page 31

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