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F- Proper Gas Flow (Approximate)
Gas Flow (Approximate)
TABLE 17
GAS METER CLOCKING CHART
ML196
Unit
Seconds for One Revolution
Natural LP
1 cu ft
Dial
2 cu ft
Dial
1 cu ft
Dial
2 cu ft
DIAL
-045 80 160 200 400
-070 55 110 136 272
-090 41 82 102 204
-110 33 66 82 164
Natural-1000 btu/cu ft LP-2500 btu/cu ft
NOTE - To obtain accurate reading, shut off all other gas
appliances connected to meter.
Furnace should operate at least 5 minutes before check
ing gas flow. Determine time in seconds for two revolu
tions of gas through the meter. (Two revolutions assures a
more accurate time). Divide by two and compare to time
in table 17. If manifold pressure matches table 16 and rate
is incorrect, check gas orifices for proper size and restric
tion. Remove temporary gas meter if installed.
G- Proper Combustion
Furnace should operate at least 15 minutes with correct
manifold pressure and gas flow rate before checking com
bustions. Take sample beyond the flue outlet and
compare to table 18.
TABLE 18
ML196
Unit
CO
2
%
For
Nat
CO
2
%
For
LP
-045
7.5 - 8.5 8.6 - 9.6
-070
-090
-110
The maximum carbon monoxide reading should not exceed 100 ppm.
H- High Altitude
NOTE - In Canada, certification for installations at eleva
tions over 4500 feet (1372 m) is the jurisdiction of local au
thorities.
ML196DFE units require no manifold pressure adjust
ments for operation at altitudes up to 10,000 feet (3048 m)
above sea level. See table 19. However, -4 and later units
installed at altitude of 4501 - 10,000 feet (1373 to 3048m)
may require a pressure switch change which can be or
dered separately and manifold de-rate. See table 16 for
manifold pressures at varying altitudes. Table 19 lists con
version kit and pressure switch requirements at varying al
titudes.
The combustion air pressure switch is factory-set and re
quires no adjustment.
NOTE - A natural to LP/propane gas changeover kit is nec
essary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.
TABLE 19
Conversion Kit and Pressure Switch Requirements at Varying Altitudes
ML196
Unit
Natural to
LP/Propane
High Altitude
Natural Burner
Orifice Kit
High Altitude
LP/Propane
Burner Orifice Kit
High Altitude Pressure Switch
0 - 7500 ft
(0 - 2286m)
7501 - 10,000 ft
(2286 - 3038m)
7501 - 10,000 ft
(2286 - 3038m)
4501 - 7500 ft
(1373 - 2286m)
7501 -10,000 ft
(2286 - 3048m)
-045
11K49 73W37 11K44
11U65 11U66
-070 11U70 11U68
-090 11U71 11U68
-110 17V95 11U67
Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-1370 m).
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