Lennox EL297DFV Series Unit Information page 62

NOTE- To obtain accurate reading, shut off all other gas
appliances connected to meter.
TABLE 25
GAS METER CLOCKING CHART
Seconds for One Revolution
EL297
Natural
Unit
1 cu ft
Dial
-045 80
-070 55
-090 41
-110 33
-135 27
Natural-1000 btu/cu ft LP-2500 btu/cu ft
IMPORTANT
For safety, shut unit off and remove manometer as
soon as an accurate reading has been obtained.
Take care to replace pressure tap plug.
LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Unit
-045
-070
090
110
* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit. Pressure switch is factory set. No
adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-1370 m).
0 - 4500 ft
Unit Gas
Low
Fire
Natuarl 1.7
All
LP/
Sizes
4.5
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.
LP
2 cu ft 1 cu ft 2 cu ft
Dial Dial
160 200
110 136
82 102
66 82
54 68
High Altitude
Natural to
Natural Burner
LP/Propane
Orifice Kit
0 - 7500 ft 7501 - 10,000 ft
*11K51 73W37
Manifold and Supply Line Pressure 0-10,000ft.
4501 - 5500 ft.
High Low High
Fire Fire Fire
3.5 1.6 3.3
10.0 4.2 9.4
G- Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com-
bustion. See sections E- and F-. Take combustion sam-
ple beyond the flue outlet. TABLE 26 shows acceptable
combustions. The maximum carbon monoxide reading
should not exceed 100 ppm.
Dial
EL297
400
Model
272
045
204
070
164
090
136
110
The maximum carbon monoxide reading should not exceed 100ppm.
H- High Altitude
The manifold pressure, gas orifice and pressure switch
may require adjustment or replacement to ensure prop-
er operation at higher altitudes. See TABLE 27 for gas
conversion and pressure switch kits. See TABLE 28 for
manifold pressures
TABLE 27
High Altitude LP/
Propane Burner
Orifice Kit
7501 - 10,000 ft
*11K46
TABLE 28
Manifold Pressure in. wg.
5501 - 6500 ft 6501 - 7500 ft
Low High Low
Fire Fire Fire
1.5 3.2 1.5
4.0 9.1 3.9
Page 62
TABLE 26
CO % For Nat
2
Low Fire High Fire Low Fire
5.6 - 6.6 7.8 - 8.8 6.6 - 7.6
5.5 - 6.5 7.3 - 8.3 6.5 - 7.5
5.9 - 6.9 7.8 - 8.8 6.9 - 7.9
6.3 - 7.3 8.2 - 9.2 7.3 - 8.3
High Altitude Pressure Switch
4501 - 7500 ft
14A51
14A48
14A54
25B93
7501 - 10,000 ft
High Low High
Fire Fire Fire
3.1 1.7 3.5
8.9 4.5 10.0
CO % For L.P
2
High Fire
9.1 - 10.1
8.6 - 9.6
9.1 - 10.1
9.5 - 10.5
7501 - 10,000 ft
14A53
14A54
14A53
14A45
Supply Line
Pressure in. w.g
0 - 10,000 ft.
Min Max
4.5 13.0
11.0 13.0