Lennox MPA012S4S-*L, MWMB009S4-*L, MWMA009S4-*L, MPB009S4S-*L, MWMA012S4-*L Installation Instructions Manual
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INSTALLATION
©
2017 Lennox Industries Inc.
Dallas, Texas, USA
Table of Contents
General ...........................................................................1
Included Parts.................................................................2
Model Number Identication ...........................................3
Indoor / Outdoor Unit Match-Ups....................................4
Typical System Components ..........................................5
System Dimensions ........................................................6
Outdoor Units ..............................................................6
Indoor Units .................................................................7
System Clearances ........................................................8
Outdoor Unit ................................................................8
Indoor Unit ...................................................................8
Torque Requirements for Caps and Fasteners...............9
Indoor Unit Installation ....................................................9
Unit Placement Considerations ...................................9
Determining Wall Mounting Plate Location ..................9
Installation of Wall Mounting Plate...............................9
Installation of Wall Sleeve..........................................10
Installation of Indoor Unit on Wall Mounting Plate .....10
Indoor Unit Condensate Piping Connections .............12
Outdoor Unit Installation ...............................................12
Placement Considerations .........................................12
Direct Sunlight, Rain, Snow and Ice Protection .........13
Prevailing Winds ........................................................14
Buried Refrigerant Pipe Protection ............................14
Outdoor Unit Condensate Piping ...............................14
Securing the Outdoor Unit .........................................15
Refrigerant Piping Connections ....................................15
Leak Test and Evacuation ............................................18
Leak Test ...................................................................18
Triple Evacuation Procedure......................................18
Wiring Connections ......................................................18
Outdoor Unit .............................................................18
Indoor Unit .................................................................18
Unit Start-Up .................................................................26
Adding Refrigerant for Longer Line Set ........................26
Troubleshooting ............................................................26
Test Run .......................................................................26
Pre-Checks ................................................................26
Procedure ..................................................................26
Double-Check Pipe Connections ...............................27
If Ambient Temperature is below 63°F (17°C) ...........27
Dry Mode Operation (Dehumidication) .......................27
Procedure ..................................................................27
Sequence of Operation ..............................................27
INSTRUCTIONS
MLA/MPA/MPB and
MWMA/MWMB Series
SINGLE-ZONE MINI-SPLIT SYSTEMS
(115V and 208/230V) --
Wall-Mounted Indoor Unit
507545-06
4/2017
Supersedes 10/2016
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, ser vice or
maintenance can cause property damage, personal
injury or loss of life.
Installation and service must be performed by a li censed
professional HVAC installer (or equivalent) or a service
agency.
WARNING
The clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs, and HFCs) as of July, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for non-compliance.
WARNING
This product contains a chemical known to the State
of California to cause cancer, birth defects, or other
reproductive harm.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
General
These instructions are intended as a general guide and
do not supersede local or national codes in any way.
Authorities having jurisdiction should be consulted before
installation.
The MWMA and MWMB wall-mounted indoor units are
matched with an outdoor heat pump unit to create a minisplit system that uses HFC-410A refrigerant.
Included Parts
Package 1 of 1 contains the following:
1 - Assembled Indoor Unit
The assembled indoor unit will include the following items:
Parts Figure Quantity Parts Figure Quantity
M0STAT60Q-1
Wireless controller
Wireless control
holder with 2 mounting
screws
Batteries (AAA) 2
1
1 Mounting plate 1
Installation and owner’s
manual
Mounting plate securing
screws
Plastic screw anchors 5
1 - Assembled Outdoor Unit and the following items:
Parts Figure Quantity Parts Figure Quantity
1 ea.
5
Drain connector 1 Seal ring 1
2
Model Number Identication
OUTDOOR SINGLE ZONE HEAT PUMP UNITS
M P A 009 S 4 S - 1 P
Series Type
M = Mini-Split
Unit Type
L = Low Ambient Heat Pump
P = Heat Pump
Major Design Sequence
A = 1st Generation
B = 2nd Generation
Nominal Cooling Capacity
009 = 0.75 tons
012 = 1 tons
018 = 1.5 tons
024 = 2 tons
030 = 2.5 tons
WALL-MOUNTED INDOOR UNITS
Series Type
M = Mini-Split
Unit Type
WM = Wall-Mounted Non-Ducted Unit
Major Design Sequence
A = 1st Generation
B = 2nd Generation
Voltage
L = 115V-1 phase-60hz
P = 208/230V-1 phase-60hz
Minor Design Sequence
1 = 1st Revision
Refrigerant Circuits
S = Single Circuit
Refrigerant Type
4 = HFC-410A
Cooling Efciency
S = Standard Efciency
M WM A 012 S 4 - 1 P
Voltage
L = 115V-1 phase-60hz
P = 208/230V-1 phase-60hz
Minor Design Sequence
1 = 1st Revision
2 = 2nd Revision
Refrigerant Type
4 = HFC-410A
Nominal Cooling Capacity
009 = .75 tons
018 = 1.5 tons
030 = 2.5 tons
Cooling Efciency
S = Standard Efciency
012 = 1 tons
024 = 2 tons
3
Indoor / Outdoor Unit Match-Ups
Outdoor Unit Indoor Unit Voltage
MPA009S4S-*L MWMA009S4-*L
MPA012S4S-*L MWMA012S4-*L
MPB009S4S-*L MWMB009S4-*L
MPB012S4S-*L MWMB012S4-*L
MPA009S4S-*P MWMA009S4-*P
MPA012S4S-*P MWMA012S4-*P
MPA018S4S-*P MWMA018S4-*P
MPA024S4S-*P MWMA024S4-*P
MPA030S4S-*P MWMA030S4-*P
MPB009S4S-*P MWMA009S4-*P
MPB012S4S-*P MWMA012S4-*P
MPB018S4S-*P MWMA018S4-*P
MPB024S4S-*P MWMA024S4-*P
MPB030S4S-*P MWMB030S4-*P
MLA009S4S-*P MWMA009S4-2P
MLA012S4S-*P MWMA012S4-2P
MLA018S4S-*P MWMA018S4-2P
MLA024S4S-*P MWMA024S4-2P
115V
115V
115V
115V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
4
Typical System Components
IMPORTANT - Condensate drain line must always
be located at the bottom of the
bundle.)
Mounting Plate
Wiring
Line set
(wrapped in foam insulation)
Filter
Return Air
Supply Air
Indoor Unit
Indoor unit wiring connections
(under access plate)
Utility
Wireless Remote
Control
Outdoor Unit
009-030 shown
Bundle
Access cover for power
and control wiring
connections
Condensate drain line
(field-provided)
TAPE
Condensate drain line
(wrapped in foam insulation)
Refrigerant Line Set, Condensate Line
And Indoor / Outdoor Cable
(field-provided)
UV-rated tape (field-provided)
IMPORTANT - The refrigerant
metering device for this system is
located in the outdoor unit. This
makes it necessary to insulate the
refrigerant lines individually to
prevent sweating.
208/230V Outdoor Unit
Terminal Block
1 2 3 L1 L2
To Indoor
Unit
To Power
Supply
Liquid and vapor shut off valves
Figure 1. Typical System Shown
5
Access cover
for valves
115V Outdoor Unit
Terminal Block
1 2 3 L N
To Indoor
Unit
To Power
Supply
System Dimensions
A
E
D
B
C
TYPICAL APPEARANCE OF UNITS
Outdoor Units
Table 1. Outdoor Unit Dimensions - Inches (mm)
Model
MPA009S4S-*L
MPA009S4S-*P
MPA012S4S-*L
MPA012S4S-*P
MPA018S4S-*P
MPA024S4S-*P
MPA030S4S-*P
MPB009S4S-*L
MPB012S4S-*L
MPB012S4S-*P
MPB009S4S-*P
MPB018S4S-*P
MPB024S4S-*P
MPB030S4S-*P
Unit of
Measurement
inches 33-1/4 21-5/8 22 11-3/8 12-3/4
mm 845 549 559 289 324
inches 36-1/8 22 27-1/2 12-3/4 13
mm 918 559 699 324 330
inches 40-5/8 25-1/4 31-7/8 15-1/8 16
mm 1032 641 810 384 406
inches 34-1/4 20-1/4 21-7/8 13-1/8 13-3/8
mm 870 514 556 333 340
inches 33-1/8 19-1/8 21-7/8 11-7/8 11-3/4
mm 842 486 556 302 298
inches 36 21-1/4 27-5/8 14-1/4 13-3/4
mm 914 540 702 362 349
inches 37-1/4 26-1/2 31-7/8 16-3/8 15-7/8
mm 1032 673 810 416 403
A B C D E
MLA009S4S-*P
MLA012S4S-*P
MLA018S4S-*P
MLA024S4S-*P
inches 34-1/4 20-1/4 21-3/4 12-1/4 13-3/8
mm 870 514 552 311 594
inches 36 21-1/4 27-5/8 13-3/4 16
mm 914 540 702 349 406
inches 40-3/4 26-1/2 31-7/8 15-1/8 16
mm 1035 673 810 384 406
6
Indoor Units
B
A
Table 2. Indoor Unit Dimensions - Inches (mm)
C
D
Size
MWMA009S4S-*L
MWMB009S4S-*L
MWMA012S4S-*L
MWMB012S4S-*L
MWMA009S4S-*P
MWMA012S4S-*P
MWMA018S4S-*P 39 991 12-3/8 314 34-3/4 883 8-5/8 210
MWMA024S4S-*P
MWMB030S4S-*P
32-7/8 835 11 279 29-1/4 743 7-7/8 200
46-3/4 1187 13-1/2 343 42-1/2 1080 10-1/4 260MWMA030S4S-*P
A B C D
in. mm in. mm in. mm in. mm
7
System Clearances
Outdoor Unit
12
(305)
Indoor Unit
Wall
24 (610)
24
(610)
1
Minimum rear clearance can be 6 inches (152 mm) when mounted on brackets
and with no obstructions on the other three sides.
Figure 2. Outdoor Unit Clearances - Inches (mm)
Ceiling
6” (152 mm)
Minimum Clearance
5”
(127 mm)
Minimum
Wall
5”
(127 mm)
Minimum
79
(2007)
Air Outlet
Air Inlet
1
12
(305)
Any Object
59”
(1499 mm)
Minimum
Vertical Clearance - Clearance to Floor - 72 inches (1829 mm) Minimum
96 inches (2438 mm) Recommended
Figure 3. Indoor Unit Clearances - Inches (mm)
Floor
FRONT VIEW
SIDE VIEW
8
Torque Requirements for Caps and
Fasteners
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. “Table 1. Torque
Requirements” on page 9 provides torque values for
fasteners.
IMPORTANT
Only use Allen wrenches of sufcient hardness (50Rc -
Rockwell scale minimum). Fully insert the wrench into
the valve stem recess.
Service valve stems are factory-torqued from 9 ft.-lbs.
(12 N*m) for small valves, to 25 ft.-lbs. (34 N) for large
valves) to prevent refrigerant loss during shipping and
handling. Using an Allen wrench rated at less than 50Rc
risks rounding or breaking off the wrench, or stripping
the valve stem recess.
See the Lennox Service and Application Notes C-08-1
for further details and information.
Table 1. Torque Requirements
Parts
Service valve cap 8 ft.-lb. 11
Sheet metal screws 16 in.-lb. 2
Machine screws #10 27 in.-lb. 3
Compressor bolts 7 ft.-lb. 10
Gauge port seal cap 8 ft.-lb. 11
Recommended Torque
U.S. Newton-Meter- N
Indoor Unit Installation
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Unit Placement Considerations
AVOID
Do not install the unit in the following locations:
• Areas exposed to petrochemicals or petrochemical
products
• Areas exposed to salt or other corrosive materials or
caustic gases
• Areas exposed to extreme voltage variations (such as
factories
• Tightly enclosed areas that may impede service of the
unit
• Areas exposed to fossil fuels (such as oil or gas in
kitchens)
• Areas exposed to strong electromagnetic forces
• Areas exposed to acids or alkaline detergents
DO
• Place the unit so that it is not exposed to direct sunlight
• Ensure the structural ceiling can support the weight of
the unit
• Select a location where condensate line will have the
shortest run to a suitable drain per local codes
• Allow sufcient space around unit for proper operation
and maintenance
• Install unit a minimum of 3 feet (1m) away from any
antenna, power cord (line) radio, telephone, security
system, or intercom. Electrical interference and radio
frequencies from any of these sources may affect operation
• Be sure to instruct customers how to properly operate
the unit (especially maintenance of air lter, and operation procedure) by having them carry out operations
themselves while looking at the manual provided with
the controller
Determining Wall Mounting Plate Location
Left piping
Left back piping
Right back piping
Right piping
Figure 4. Determining Exit Locations
1. Remove the wall mounting plate from the back of the
indoor unit.
2. Determine the best exit location for utility bundle (line
set, condensate line and wiring). See the following
section concerning wall sleeve installation instructions.
3. Position the wall mounting plate on the wall so that,
when installed, the unit will be at least 6 inches (152
mm) from the ceiling and 5 inches (127 mm) from the
wall on either side. The wall mounting plate must be
level side-to-side.
4. Use the wall mounting plate as a template to determine
the exit point for utility bundle. Mark the wall to facilitate
drilling hole for utility bundle.
Installation of Wall Mounting Plate
Install the wall mounting plate (see “Figure 8. Wall
Mounting Plates - Inches (mm)” on page 11) so that it is
correctly positioned horizontally and vertically. The indoor
unit must be installed level on the wall to allow proper
condensate drainage.
1. Use a carpenter’s level or measuring tape to verify the
wall mounting plate is horizontally level.
2. Secure the wall mounting plate to the wall using the
provided screws and screw anchors.
NOTE: It is important to use all screws provided to secure
the wall mounting plate to the wall. Additional holes
may be drilled through the metal wall mounting
9
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