York ZR240 Specifications download pdf (Page 24)

275864-YIM-C-0910

24 Johnson Controls Unitary Products

Optional Gas Heat

These gas-fired heaters have aluminized-steel or optional

stainless steel, tubular heat exchangers with spark ignition with

proven pilot.

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followed in all cases unless superseded by local codes or gas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 12. 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.

Figure 13: External Supply Connection External Shut-Off

Figure 14: Bottom Supply Connection External Shut-Off

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 11: Gas Application Data

Unit

Input

(MBH)

Output (MBH)

Temp Rise

(°F)

1. On VAV units, individual VAV boxes must be full open in

heating mode to insure airflow falls within temperature rise

range.

Size Opt.

180

24 300 240 20-50

32 400 320 30-60

240

24 300 240 20-50

32 400 320 30-60

300

24 300 240 20-50

32 400 320 30-60

Drip Leg

Main

Manual

Shut-off

Valve

Table 12: Gas Pipe Sizing - CapacIty of Pipe

Length of

Pipe (ft.)

Nominal Iron Pipe Size

1 in. 1-1/4 in.

10 520 1050

20 350 730

30 285 590

40 245 500

50 215 440

60 195 400

70 180 370

80 170 350

90 160 320

100 150 305

Table 13: Gas Heat Minimum Supply Air

Size

(Tons)

Heat Size

Supply Air (CFM)

Cooling Heating

Min Max Min Max

180

(15)

24 4500 7000 4500 7000

32 4500700045007000

240

(20)

24 6000 9400 6000 9400

32 6000940060009400

300

(25)

24 7500 12500 7500 12500

32 7500 12500 7500 12500

Drip Leg

Main

Manual

Shut-off

Valve

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York ZR240 Specifications Page 24

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