Lennox iComfort SL280UH070V36A Manual page 46

Unit Orifice Size
Gas
Input 0 - 7500 ft.
Natural
070
LP/propane 3
Natural
090
3
LP/propane
Natural
110
3
LP/propane
Natural
135
3
LP/propane
1
This is the only permissible derate for these units.
2
Natural gas high altitude orifice kit required.
3
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.
NOTE - Units may be installed at altitudes up to 4500 ft. above sea level without modifications.
TABLE 20
High Altitude Pressure Switch Kits
Unit
Input
0 - 4500 ft.
070 No Change
090 No Change
110 No Change
135 No Change
TABLE 21
Honeywell Gas Valve Conversion Kits
High Altitude
Natural Gas
Unit
Orifice Kit
Input
7501 -
0 - 7500 ft.
10,000 ft.
070 73W37 51W02
090 73W37 51W02
110 73W37 51W02
135 73W37 51W02
Manifold Pressure Settings
Orifice Size
Pressure in.wg.
7501 -
1
10,000 ft.
.063 .055
.034 .032
.063 .055
.034 .032
.063 .055
.034 .032
.063 .055
.034 .032
High Altitude
Pressure Switch Kit
4501 - 7500 ft. 7501 - 10,000 ft.
No Change 73W35
69W56 73W35
69W56 73W35
73W33 73W34
LP/Propane
Natural Gas to to
LP/ Propane Kit Natural Gas
Kit
7501 -
0 - 7500 ft.
10,000 ft.
73W38 69W79
73W38 69W79
73W38 69W79
73W38 69W79
TABLE 19
Manifold Manifold
Pressure in.wg.
0-4500 ft. 4501-7500 ft.
Low High Low
Fire Fire Fire
1.7 3.5 1.6
4.5 10.0 4.5
1.7 3.5 1.5
4.5 10.0 4.5
1.7 3.5 1.5
4.5 10.0 4.5
1.7 3.5 1.6
4.5 10.0 4.5
White Rodgers Gas Valve Conversion Kits
High Altitude
Natural Gas
Unit
Orifice Kit
Input
7501 -
10,000 ft.
070
090
73W37
110
135
Page 46
Manifold
Pressure in.wg.
2
7501 - 10,000 ft.
High Low High
Fire Fire Fire
3.4 1.7 3.5
10.0 4.5 10.0
3.2 1.7 3.5
10.0 4.5 10.0
3.2 1.7 3.5
10.0 4.5 10.0
2.8 1.7 3.5
10.0 4.5 10.0
TABLE 22
Natural Gas to
LP/ Propane Kit
7501 -
0 - 7500 ft.
10,000 ft.
11K51 11K46
Supply Line
Pressure
in. w.g.
Min Max
4.5 13.0
11.0 13.0
4.5 13.0
11.0 13.0
4.5 13.0
11.0 13.0
4.5 13.0
11.0 13.0
LP/Propane
to
Natural Gas
Kit
0 - 7500 ft.
77W09