Lennox ML193DFE Series Unit Information page 42

F- Proper Gas Flow (Approximate)
TABLE 17
GAS METER CLOCKING CHART
Seconds For One Revolution
ML196 Natuarl
Unit
1 cu ft
Dial
-045 80
-070 55
-090 41
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 19 and
rate is incorrect, check gas orifices for proper size and
restriction. Remove temporary gas meter if installed.
ML193
Gas
Unit
Natural
All
Models
L.P. Propane
NOTE - A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the
conversion procedure.
Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Natural to LP/
Propane
ML193
Unit
0 - 7500 ft
(0 - 2286m)
-045
-070 *11K49
-090
*
Conversion requires installation
Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-1370 m).
LP/Propane
2 cu ft 1 cu ft
Dial Dial
160 200
110 136
82 102
Manifold and Supply Line Pressure 0-10,000ft.
Manifold Pressure in. wg
0 - 4500 ft 4501 - 5500 ft
3.5 3.3
10.0 9.4
High Altitude
LP/Propane to
Natural Burner
Natural
Orifice Kit
0 - 7500 ft
7501 - 10,000 f t
(2286 - 3038m)
(0 - 2286m)
73W37 *73W81
of a gas valve
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. The maximum carbon monoxide reading
should not exceed 100 ppm.
2 cu ft
Dial
ML193 Unit
400
-045
272
-070
204
-090
H- High Altitude
NOTE - In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local
authorities.
Units may be installed at altitudes up to 10,000 ft. Above
sea level. See TABLE 19 for de-rate manifold values. Units
installed at altitude of 7501 - 10,000 feet require an orifice
change. Units installed at altitude of 4501 - 10,000 feet
require a pressure switch change which can be ordered
separately. TABLE 20 lists conversion kit and pressure
switch requirements at varying altitudes.
NOTE - A natural to LP/propane gas changeover kit is
necessary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.
TABLE 19
.
5501 - 6500 ft 6501 - 7500 ft 7501 - 10,000 ft
3.2 3.1
9.1 8.9
TABLE 20
High Altitude
LP/Propane Burner
Orifice Kit
7501 - 10,000 ft
(2286 - 3038m)
11K44
manifold spring which
Page 42
TABLE 18
CO % Nat
2
7.0 - 9.0
Supply Line Pressure
3.5 4.5
10.0 11.0
High Altitude Pressure Switch
4501 - 7500 ft
(1373 - 2286m)
11U65
is provided with the gas
CO % LP
2
8.0 - 10.0
in. w.g.
0 - 10000 ft.
13.0
13.0
7501 -10,000 ft
(2286 - 3048m)
11U66
conversion kit.