Trane Gas Unit Heaters Wartungshandbuch
10
GBNE-SVX001A-EN
Installation
(continued)
Gas Piping
NOTICE: If more than one unit heater is to be served by the
same piping arrangement, the total cu. ft./hr. input and length
of pipe must be considered.
same piping arrangement, the total cu. ft./hr. input and length
of pipe must be considered.
NOTICE: If the gas unit heater is to be fired with LP gas,
consult your local LP gas dealer for pipe size information.
consult your local LP gas dealer for pipe size information.
NOTICE: HEATER INSTALLATION FOR USE WITH PROPANE
(BOTTLED) GAS MUST BE MADE BY A QUALIFIED L.P.
GAS DEALER OR INSTALLER. HE/SHE WILL INSURE THAT
PROPER JOINT COMPOUNDS ARE USED FOR MAKING
PIPE CONNECTIONS; THAT AIR IS PURGED FROM LINES;
THAT A THOROUGH TEST IS MADE FOR LEAKS BEFORE
OPERATING THE HEATER; AND THAT IT IS PROPERLY
CONNECTED TO THE PROPANE GAS SUPPLY SYSTEM.
Before any connection is made to the existing line supplying
other gas appliances, contact the local gas company to make
sure that the existing line is of adequate size to handle the
combined load.
other gas appliances, contact the local gas company to make
sure that the existing line is of adequate size to handle the
combined load.
1. Determine the required Cu. Ft./Hr. by dividing the input by 1000. For SI/Metric measurements: Convert BTU/Hr. to kilowatts. Multiply
the units inputs (kW) by 0.0965 to determine Cu. Meters./Hr. 2. FOR NATURAL GAS: Select pipe size directly from the table. 3. FOR
PROPANE GAS: Multiply the Cu. Ft./Hr. value by 0.633; then, use the table. 4. Refer to the metric conversion factors listed in the General
Safety section for SI Unit measurement conversions.
the units inputs (kW) by 0.0965 to determine Cu. Meters./Hr. 2. FOR NATURAL GAS: Select pipe size directly from the table. 3. FOR
PROPANE GAS: Multiply the Cu. Ft./Hr. value by 0.633; then, use the table. 4. Refer to the metric conversion factors listed in the General
Safety section for SI Unit measurement conversions.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour (Cubic Meters per Hour) for Gas Pressures of 0.5 psig (3.5 kPa) or Less,
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)
(Based on a 0.60 Specific Gravity Gas)
Nominal
Iron Internal
Length of Pipe, Feet (meters)
Pipe Size
Diameter
10 20 30 40 50 60 70 80 90 100 125 150 175 200
Inch
Inch
(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)
Table 3 - Gas Pipe Size
PIPE SIZING
To provide adequate gas pressure to the gas unit heater, size
the gas piping as follows:
To provide adequate gas pressure to the gas unit heater, size
the gas piping as follows:
1. Find the cu. feet/hr. by using the following formula:
Cu. feet/hr. =
Input BTU/Hr.
1000
2. Refer to Table 3. Match “Length of Pipe in Feet”
with appropriate “Gas Input - Cu. Feet/Hr.” figure. This
figure can then be matched to the pipe size at the top of
the column.
figure can then be matched to the pipe size at the top of
the column.
Example:
It is determined that a 67 foot (20.4m) run of gas
pipe is required to connect a 200 MBTU gas unit heater
to a 1,000 BTU/cu feet (0.29kW) natural gas supply.
pipe is required to connect a 200 MBTU gas unit heater
to a 1,000 BTU/cu feet (0.29kW) natural gas supply.
200,000 BTU/Hr = 200 Cu. feet/hr.
1,000 BTU/cu. feet
Using Table 3, a 1 inch pipe is needed.
NOTE: See General Safety Information section for English/
Metric unit conversion factors.
Metric unit conversion factors.
WARNING
To avoid damage or possible personal injury, do not connect gas piping to this unit until a supply line pressure/leak test has been completed.
Connecting the unit before completing the pressure/leak test may damage the unit gas valve and result in a fire hazard.
WARNING
Do not rely on a shut-off valve to isolate the unit while conducting gas pressure/leak tests. These valves may not be completely shut
off, exposing the gas valve to excessive pressure and damage.