Trane Gas Unit Heaters Instalační manuál stáhnout pdf (Strana 14)

Installation

14 GUNE-SVX001A-EN

Pipe Installation

1. Install the gas piping in accordance with applicable

local codes.

2. Check gas supply pressure. Each duct furnace must be

connected to a manifold pressure and a gas supply

capable of supplying its full rated capacity as specified

in Tab le 4 . A field LP tank regulator must be used to

limit the supply pressure to a maximum of 14 inches

wc (3.5 kPa). All piping should be sized in accordance

with the latest edition of ANSI Standard Z223.1

(NFPA 54), National Fuel Gas Code; in Canada,

according to CSA B149. See Table 1, p. 8 and Table 4

for correct gas piping size. If gas pressure is excessive

on natural gas applications, install a pressure

regulating valve in the line upstream from the main

shutoff valve.

3. Adequately support the piping to prevent strain on the

gas manifold and controls.

4. To prevent the mixing of moisture with gas, run the

take-off piping from the top, or side, of the main.

5. Standard duct furnaces, optional two-stage and

modulation units are supplied with a combination

valve which includes:

a. Manual “A” valve

b. Manual “B” valve

c. Solenoid valve

d. Pressure regulator

Pipe directly into the combination valve (see Figure 8,

p. 15).

6. Gas valve has a pressure test post requiring a 3/32-inch

hex head wrench to read gas supply and manifold

pressures. Open 1/4 turn counterclockwise to read,

turn clockwise to close and re-seat. A 5/16-inch ID hose

fits the pressure post.

7. Provide a drip leg in the gas piping near the gas duct

furnace. A ground joint union and a manual gas shutoff

valve should be installed ahead of the unit heater

controls to permit servicing. The manual shutoff valve

must be located external to the jacket (see Figure 8).

8. Make certain that all connections have been

adequately doped and tightened.

Table 4. Gas pipe size

(a)

Nominal

Iron

Pipe

Size (in)

Internal

Diameter

(in)

Length of Pipe, feet (meters)

10 20 30 40 50 60 70 80 90 100 125 150 175 200

(3.0) (6.1) (9.1) (12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)

1/2 0.622

175 120 97 82 73 66 61 57 53 50 44 40 37 35

(4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) (1.25) (1.13) (1.05) (0.99)

3/4 0.824

360 250 200 170 151 138 125 118 110 103 93 84 77 72

(10.2) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54) (3.34) (3.11) (2.92) (2.63) (2.38) (2.18) (2.04)

1 1.049

680 465 375 320 285 260 240 220 205 195 175 160 145 135

(19.3) (13.2) (10.6) (9.06) (8.07) (7.36) (6.80) (6.23) (5.80) (5.52) (4.96) (4.53) (4.11) (3.82)

1-1/4 1.380

1400 950 770 660 580 530 490 460 430 400 360 325 300 280

(39.6) (26.9) (21.8) (18.7) (16.4) (15.0) (13.9) (13.0) (12.2) (11.3) (10.2) (9.20) (8.50) (7.93)

1-1/2 1.610

2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430

(59.5) (41.3) (33.4) (28.0) (25.5) (22.9) (21.2) (19.5) (18.4) (17.6) (15.6) (14.2) (13.0) (12.2)

2 2.067

3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800

(112) (77.9) (62.3) (53.8) (47.6) (43.0) (39.6) (36.8) (34.5) (32.6) (28.9) (26.9) (24.1) (22.7)

2-1/2 2.469

6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280

(178) (123) (99.7) (85.0) (75.0) (68.0) (63.7) (58.0) (55.2) (52.4) (46.7) (42.5) (38.8) (36.2)

3 3.068

11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280

(311) (218) (177) (150) (135) (122) (110) (105) (97.7) (92.0) (83.5) (75.0) (69.4) (64.6)

4 4.026

23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600

(651) (447) (362) (309) (275) (249) (229) (212) (204) (190) (170) (156) (142) (130)

Notes:

1. Determine the required ft

/h by dividing the input by 1,000.

For SI/metric measurements: convert Btu/h to kW. Multiply the unit’s inputs (kW) by 0.0965 to determine m

/h.

2. For natural gas: select pipe size directly from the table.

3. For propane gas: multiply the ft

/h value by 0.633; then, use the table.

Refer to the metric conversion factors listed in “General Safety Information,” p. 3 for SI Unit measurement conversions.

(a) Maximum capacity of pipe in ft

/h of gas (m

/h) for gas pressures of 0.5 psig (3.5 kPa) or less, and a pressure drop of 0.5 in. wc (124.4 Pa), based on

a 0.60 specific gravity gas.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 38 39

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