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Page 18
TABLE 7
LP/PROPANE GAS MANIFOLD PRESSURES - in.wg. (kPa )
ALTITUDE FT.
(
M
)
MODEL
0-2000
(0-610)
2001-3000
(610-914)
3001-4000
(915-1219)
4001-5000
(1220-1524)
5001-6000
(1524-1829)
6001-7000
(1829-2134)
7001-8000
(2134-2438)
8001-9000
(2439-2743)
9001-10000
(2744-3048)
TUA045SL 9.5
(
2.37
)
* 7.4
(
1.84
)
6.7
(
1.67
)
6.1
(
1.52
)
5.5
(
1.37
)
4.9
(
1.22
)
4.4
(
1.10
)
3.9
(
0.97
)
3.4
(
0.85
)
TUA060SL 9.5
(
2.37
)
* 7.4
(
1.84
)
6.7
(
1.67
)
6.1
(
1.52
)
5.5
(
1.37
)
4.9
(
1.22
)
4.4
(
1.10
)
3.9
(
0.97
)
3.4
(
0.85
)
TUA075SL 9.5
(
2.37
)
* 7.4
(
1.84
)
6.7
(
1.67
)
6.1
(
1.52
)
5.5
(
1.37
)
4.9
(
1.22
)
4.4
(
1.10
)
3.9
(
0.97
)
3.4
(
0.85
)
TUA100SL 9.0
(
2.24
)
* 7.0
(
1.74
)
6.4
(
1.59
)
5.8
(
1.44
)
5.2
(
1.30
)
4.7
(
1.17
)
4.2
(
1.05
)
3.7
(
0.92
)
3.2
(
0.80
)
TUA125SL 9.0
(
2.24
)
* 7.0
(
1.74
)
6.4
(
1.59
)
5.8
(
1.44
)
5.2
(
1.30
)
4.7
(
1.17
)
4.2
(
1.05
)
3.7
(
0.92
)
3.2
(
0.80
)
*No adjustment required.
Gas Flow
Check for proper gas flow to the unit heater.
1. Operate unit at least 15 minutes before checking
gas flow. Determine the time in seconds for one
revolution of gas through the meter.
2. Compare the number of seconds and the gas
meter size in table 8 to determine the gas flow rate.
Multiply the gas flow rate by the heating value to
determine the unit input rate. If manifold pressure is
correct and the unit input rate is incorrect, check
gas orifices for proper size and restriction.
3. Remove temporary gas meter if installed.
NOTE – To obtain accurate reading, shut off all other
gas appliances connected to meter.
TABLE 8
Gas Flow Rate (Ft.
3
/Hr.)
Gas Meter Size Seconds for 1
Revolution
½ cu ft Dial 1 cu ft Dial
10 180 360
12 150 300
14 129 257
16 113 225
18 100 200
20 90 180
22 82 164
24 75 150
26 69 138
28 64 129
30 60 120
32 56 113
34 53 106
36 50 100
38 47 95
40 45 90
42 43 86
44 41 82
46 39 78
48 38 75
50 36 72
52 35 69
54 33 67
56 32 64
58 31 62
60 30 60
Natural = 1000 btu/cu ft LP = 2500 btu/cu ft
Note: Table assumes standard temperature (60°F), barometric
pressure (30 in Hg), and fuel heating values (btu/cu ft). Fuel heating
values may vary, contact local fuel supplier to obtain actual heating
value of fuel being supplied.