High Altitude Derate - Lennox EL280UH110P60C Unit Information

OPTIONAL ACCESSORIES - ORDER SEPARATELY
NOTE - FURNACES CANNOT BE TWINNED!
CABINET ACCESSORIES
Horizontal Suspension Kit - Horizontal only
Return Air Base - Upflow only
FILTERS
Air Filter and Rack Kit
1
SERVICE KITS
Night Service Kit
Universal Service Kit - Switches
VENTING
Vent Adaptor − 6 in. conn. size upflow applications only
Cleanable polyurethane, frame-type filter.
1
GAS HEAT ACCESSORIES - ORDER SEPARATELY
Pressure Switch Kit
Input
0 - 4500 ft. 4501 - 7500 ft. 7501 - 10,000 ft.
070 No Change
090 No Change
110 No Change
135 No Change

HIGH ALTITUDE DERATE

NOTE - Units may be installed at altitudes up to 4500 ft. above sea level without any modifications.
At altitudes above 4500 ft. units must be derated to match information in the shaded area shown below.
NOTE - This is the only permissible derate for these units.
0 - 4500 Feet
Input
Natural Gas
High Low
Fire Fire
070 3.5 1.7
090 3.5 1.7
110 3.5 1.7
135 3.5 1.7
Natural Gas High Alitude Orifice Kit required.
1
Horizontal (end)
Size of filter - in.
Side Return
Ten Pack
Size of filter - in.
High Altitude
91W53 73W35
91W53 73W35
91W53 73W35
73W33 73W34
Gas Manifold Pressure (Outlet) in. w.g.
LPG/Propane Natural Gas
High Low High
Fire Fire Fire
10 4.9 3.2
10 4.9 3.2
10 4.9 3.2
10 4.9 2.8
"A" Width "B" Width
Models Models
51W10 51W10
65W75 50W98
87L95 87L96
14 x 25 x 1 18 x 25 x 1
Single 44J22 44J22
66K63 66K63
16 x 25 x 1 16 x 25 x 1
51W04 51W04
89W19 89W19
18M79 18M79
Natural Gas to LPG/Propane
LPG/Propane to Natural Gas
Kit Kit
0 - 7500 ft. 0 - 7500 ft.
77W07 77W09
77W07 77W09
77W07 77W09
77W07 77W09
4501 -7500 Feet
LPG/Propane
Low High Low
Fire Fire Fire
1.5 10 4.9
1.5 10 4.9
1.5 10 4.9
1.5 10 4.9
Page 4
"C" Width "D" Width
Models Models
51W10 51W10
50W99 51W00
87L97 87L98
20 x 25 x 1 25 x 25 x 1
44J22 44J22
66K63 66K63
16 x 25 x 1 16 x 25 x 1
51W04 51W04
89W19 89W19
18M79 18M79
Natural Gas LPG/Propane
High Altitude High Altitude
Orifice Kit Orifice Kit
7501 - 10,000 ft. 7501 - 10,000 ft.
73W37 77W11
73W37 77W11
73W37 77W11
73W37 77W11
7501 - 10,000 ft.
Natural Gas LPG/Propane
1
High Low High
Fire Fire Fire
3.5 1.7 10
3.5 1.7 10
3.5 1.7 10
3.5 1.7 10
Low
Fire
4.9
4.9
4.9
4.9