Johnson-controls AFFINITY 340968-XIM-A-0108 User Manual download pdf (Page 8)

340968-XIM-A-0108

8 Johnson Controls Unitary Products

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 or CAN/CGA

B149.1 or .2 should be followed in all cases unless super-

seded by local codes or gas company requirements. Refer to

Tables 5 and 6.

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 specify-

ing a minimum diameter for gas piping. All units

require a 1/2 inch pipe connection at the gas valve.

GAS CONNECTION

The gas supply line can be routed through the hole located

on the left side of the unit. Refer to Figure 7 to locate these

access openings. Typical supply piping arrangements are

shown in Figure 5.

Gas piping recommendations:

1. A drip leg and a ground joint union must be installed in

the gas piping.

2. When required by local codes, a manual shut-off valve

may have to 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.

FIGURE 5 - EXTERNAL SUPPLY CONNECTION

EXTERNAL SHUT-OFF

1 / 2 x 1 / 2 G A S C O C K

1 / 2 x 1 / 2 U N I O N

A U T O M A T I C

G A S V A L V E

D R I P L E G

1 / 2 - 1 4 N P

TABLE 5: NATURAL GAS PIPE SIZING CHART

Maximum capacity of pipe in cubic feet of gas per hour (based

upon a pressure drop of 0.3 inch water column and 0.6 specific

gravity gas).

LENGTH

IN FEET

NOMINAL INCHES IRON PIPE SIZE

1/2” 3/4” 1” 1-1/4”

10 132 278 520 1,050

20 92 190 350 730

30 73 152 285 590

40 63 130 245 500

50 56 115 215 440

60 50 105 195 400

70 46 96 180 370

80 43 90 170 350

90 40 84 160 320

100 38 79 150 305

TABLE 6: PROPANE (LP) GAS PIPE SIZING

CHART

Maximum capacity of pipe in thousands of BTU per hour (based

upon a pressure drop of 0.5 inch water column).

LENGTH

IN FEET

NOMINAL INCHES IRON PIPE SIZE

1/2” 3/4” 1” 1-1/4”

10 275 567 1,071 2,205

20 189 393 732 1,496

30 152 315 590 1,212

40 129 267 504 1,039

50 114 237 448 913

60 103 217 409 834

70 96 196 378 771

80 89 185 346 724

90 83 173 322 677

100 78 162 307 630

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 23 24

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