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507964-01 9/2019
D-Proper Gas Flow (Approximate)
1- Operate unit at least 15 minutes before checking gas
flow. Determine the time in seconds for two revolutions
of gas through the meter. (Two revolutions assures a
more accurate time.) A portable LP gas meter (17Y44)
is available for LP applications.
2- Divide the number of seconds by two and compare
to the time in table 23. If manifold pressure is correct
and 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 23
GAS METER CLOCKING CHART
Unit
Input
Rate
(Btuh)
Seconds for One Revolution
Natural LP
1 cu ft
Dial
2 cu ft
Dial
1 cu ft
Dial
2 cu ft
Dial
70,000 51 103 129 257
108,000 33 67 83 167
150,000 24 48 60 120
130,000 28 55 69 138
180,000 20 40 50 100
240,000 15 30 38 75
260,000 14 28 35 69
360,000 10 20 25 50
480,000 8 15 19 38
Natural-1000 btu/cu ft LP-2500 btu/cu ft
Note: Table assumes standard temperature (60°F), pressure
(30in.Hg.)and fuel heating values (Btuh/Ft.
3
). Apply pressure
corrections in altitudes above 2000 ft.
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