High Altitude Derate; Installation Clearances - Lennox ML180DF045P24A Unit Information

OPTIONAL ACCESSORIES - ORDER SEPARATELY
CABINET ACCESSORIES
Downflow Combustible Flooring Base
CONTROLS
Twinning Kit
FILTERS
Downflow Filter Cabinet
1
service kits
Night Service Kit
Universal Service Kit - Switches
Cleanable polyurethane, frame-type filter.
1
GAS HEAT ACCESSORIES
Pressure Switch Kit
Input
0 - 4500 ft. 4501 - 7500 ft. 7501 - 10,000 ft.
045 No Change
070 No Change
090 No Change
110 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 areas shown below.
NOTE - This is the only permissible derate for these units.
0 - 4500 Feet
Input
Natural
Gas
045 3.5
070 3.5
090
3.5
110 3.5
Natural Gas High Alitude Orifice Kit required.
1

INSTALLATION CLEARANCES

Vent Type
Sides
Rear
Top
Front 2-1/4 in. (57 mm)
Front (service/alcove) 24 in. (610 mm)
Floor
2
Flue
No. and Size of filter - in.
High Altitude
No Change 80W51
80W52 80W51
No Change 80W51
80W52 80W51
Gas Manifold Pressure (Outlet) in. w.g.
4501 - 7500 Feet
LPG/ Natural
Propane Gas Propane
10 3.5
10 3.3
10 3.3
10 3.3
Type B1 Type C
0 in. (0 mm) in. (0 mm)
1
0 in. (0 mm) 0 in. (0 mm)
1 in. (25 mm) 1 in. (25 mm)
2-1/4 in. (57 mm)
24 in. (610 mm)
Combustible Combustible
2
1 in. (25 mm) 6 in. (152 mm)
"A" Width
Models
11M59
15L38
51W06
(1) 20 x 20 x 1
51W03
89W19
Natural Gas to
LPG/Propane Kit
0 - 7500 ft. 7501 - 10,000 ft.
70W89 76W15
70W89 76W15
70W89 76W15
70W89 76W15
7501 - 10,000 ft.
LPG/ Natural LPG/
1
Gas Propane
10 3.5
10 3.5
10 3.5
10 3.5
NOTE − Air for combustion must conform to the methods outlined in the
National Fuel Gas Code (NFPA 54/ANSI-Z223.1).
NOTE − In the U.S. flue sizing must conform to the methods outlined in the
current National Fuel Gas Code (NFPA 54/ANSI-Z223.1) or applicable
provisions of local building codes.
Left side requires 4 in. if single wall vent is used on 14-1/2 in. "A" width
1
cabinets, 2 in. on 17-1/2 in. "B" width cabinets.
Clearance for installation on combustible floor if Optional Downflow
2
Combustible Flooring Base is installed between furnace and combustible floor.
Not required in add-on cooling applications if installed in accordance with local
codes, National Fuel Gas Code ANSI-Z223.1 or National Standard of Canada
CAN/CSA-B149.1 and CAN/CSA-B149.2 Installation Code for Gas Burning
Appliances". Do not install the furnace directly on carpeting, tile, or other
combustible materials other than wood flooring.
Page 3
"B" Width
Models
11M60
15L38
51W07
(2) 20 x 16 x 1
51W03
89W19
LPG/Propane
to Natural Gas Kit
0 - 7500 ft.
73W81
73W81
73W81
73W81
Line Pressure - in. w.g.
Minimum
Natural LPG/
Gas Propane
10 4.5 11
10 4.5 11
10 4.5 11
10 4.5 11
"C" Width
Models
11M61
15L38
51W08
(2) 20 x 16 x 1
51W03
89W19
Natural Gas
High Altitude
Orifice Kit
7501 - 10,000 ft.
73W37
73W37
73W37
73W37
Maximum
13
13
13
13