Lennox EL297UH045XV36B Unit Information page 81

NOTE- To obtain accurate reading, shut off all other gas
appliances connected to meter.
TABLE 26
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.
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/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Unit
045
070
090
110
135
* 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).
LP
2 cu ft 1 cu ft 2 cu ft
Dial Dial
160 200
110 136
82 102
66 82
54 68
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
High Altitude
Natural to
Natural Burner
LP/Propane
Orifice Kit
0 - 7500 ft 7501 - 10,000 ft
*11K51 73W37
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 27 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
135
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 proper
operation at higher altitudes. See TABLE 28 for manifold
pressures. See TABLE 29 for gas conversion and pres-
sure switch kits.
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
TABLE 29
High Altitude LP/
Propane Burner
Orifice Kit
7501 - 10,000 ft
*11K46
Page 81
TABLE 27
CO % For Nat
2
Low Fire High Fire Low Fire
5.4 - 6.4 7.5 - 8.5 6.4 - 7.4
5.3 - 6.3 7.4 - 8.4 6.3 - 7.3
5.8 - 6.8 7.6 - 8.6 6.8 - 7.8
6.1 - 7.1 8.0 - 9.0 7.1 - 8.1
6.1 - 7.1 7.8 - 8.8 7.1 - 8.2
7501 - 10,000 ft
High Low High
Fire Fire Fire
3.1 1.7 3.5
8.9 4.5 10.0
High Altitude Pressure Switch
4501 - 7500 ft
14A51
14A48
14A54
25B93
25B94
CO % For L.P
2
High Fire
8.8 - 9.8
8.7 - 9.7
8.9 - 9.9
9.3 - 10.3
9.1 - 10.1
Supply Line
Pressure in. w.g
0 - 10,000 ft.
Min Max
4.5 13.0
11.0 13.0
7501 - 10,000 ft
14A53
14A54
14A53
14A45
25B95