High Altitude - Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual

High Altitude

The manifold pressure, gas orifice and pressure switch
may require adjustment or replacement to ensure proper
operation at higher altitudes. Tables 21 through 23 shows
manifold pressure, pressures switch and gas conversion
kits at all altitudes.
Unit Orifice Size
Gas
Input 0 - 7500 ft.
Natural
070
LP/propane
3
Natuarl
090
LP/propane
3
Natural
110
LP/propane
3
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 22
Unit High Altitude Pressure Switch Kit
Input
0 - 4500 ft. 4501 - 7500 ft.
070 No Change No Change
090 No Change
110 No Change
Manifold Pressure Settings
Orifice Size
0 - 7500 ft
1.
.063 .055.
.034 .032
.063 .055
.034 .032
.063 .055
.034 .032
7501 - 10,000 ft.
73W36
69W56 73W36
69W56 73W35
.For safety, shut unit off and remove manometer as soon
as an accurate reading has been obtained. Take care to
replace pressure tap plug.
TABLE 21
Manifold Pres- Manifold Pres-
sure in. wg. 0 sure in. wg.
- 4500 ft 4500 - 7500 ft
Low High Low
Firer 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
High Altitude
Natural Gas
Unit
Orifice Kit
Input
10,000 ft
070
090
110
Page 40
IMPORTANT
Manifold Pressure
in. wg. 7500 -
10,000 ft
2
High Low High
Fire Fire Fire
3.4 1.7 3.5
10.0 4.5 10.5
3.0 1.7 3.5
10.0 4.5 10.0
3.2 1.7 3.5
10.0 4.5 10.0
.
TABLE 23
Natural Gas to LP/
Propane Kit
7501 -
0 - 7500 ft
10,000 ft
73W37 11K51
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
LP/
Propane
to Natural
Gas Kit
7501 -
0 - 7500 ft
11K46 77W09