508033-02Issue 2135Page 30 of 48
Proper Gas Flow (Approximate)
Furnace should operate at least 5 minutes before checking
gas ow. Determine time in seconds for two revolutions of
gas through the meter. (Two revolutions assures a more
accurate time.) Divide by two and compare to time in
Table 19 below.
NOTE: To obtain accurate reading, shut o all other gas
appliances connected to meter.
Unit
Seconds for One Revolution
Natural
1 cu ft Dial 2 cu ft Dial
060 60 120
080 45 90
100 36 72
Natural-1000 btu/cu ft
Table 19. Gas Meter Clocking Chart
High Altitude
Units may be installed at altitudes up to 7,500 ft. above
sea level. See Table 18 for de-rate manifold values. Units
installed at altitude of 4,501 - 7,500 feet require a pressure
switch change which can be ordered separately. Table 20
lists pressure switch requirements at high altitude.
The combustion air pressure switch is factory-set and
requires no adjustment.
Unit
High Altitude Pressure Switch
(4,501 - 7,500 ft)
Natural LP/Propane
060 20K91 No Change
080 No Change N/A
100 No Change N/A
Table 20.
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