Lennox MPA036S4M-*P, MLA018S4M-*P, MLA030S4M-*P, MPB030S4M-*P, MPA048S4M-*P Installation Instructions Manual
...
INSTALLATION
©
2017 Lennox Industries Inc.
Dallas, Texas, USA
Table of Contents
General ...........................................................................1
Included Parts.................................................................2
Compatible Indoor Units .................................................2
Model Number Identication ...........................................2
Typical Multi-Zone System Components ........................3
Outdoor Unit Dimensions ...............................................4
Outdoor Unit Clearances ................................................4
Torque Requirements for Caps and Fasteners...............5
Outdoor Unit Installation .................................................5
Placement Considerations ..........................................5
Direct Sunlight, Rain, Snow and Ice Protection ..........5
Prevailing Winds .........................................................6
Buried Refrigerant Pipe Protection .............................7
Outdoor Unit Condensate Piping ................................7
Securing the Outdoor Unit ..........................................7
Refrigerant Piping Connections ......................................8
Indoor Unit Installation ....................................................9
Connecting Multiple Capacity Indoor Units .................9
Indoor / Outdoor Unit Match-Ups ..............................11
Leak Test and Evacuation ............................................16
Leak Test ..................................................................16
Triple Evacuation Procedure .....................................16
Wiring Connections ......................................................16
Outdoor Unit .............................................................17
Indoor Units...............................................................17
Unit Start-Up .................................................................24
Refrigerant Charge .......................................................24
WARNING
This product contains a chemical known to the State
of California to cause cancer, birth defects, or other
reproductive harm.
INSTRUCTIONS
MPA, MPB and MLA
MULTI-ZONE OUTDOOR
UNITS
MULTI-ZONE MINI-SPLIT OUTDOOR UNITS
(208/230V) --
507549-05
3/2017
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.
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
Refer to the Product Specications bulletin (EHB) for more
product information.
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, MWMB, M22A, M33A, M33B, MMDA, MCFA
and MCFB indoor units are matched with a two to ve port
multi-zone outdoor heat pump unit to create a mini-split
system that uses HFC-410A refrigerant.
Included Parts
Check the components for shipping damage. If you nd any damage, immediately contact the last carrier.
Package contains the following:
1 - Assembled Indoor Unit (The assembled indoor unit will include accessories specic to the unit, see each indoor unit’s
section within this manual for accessories included with that unit.)
1 - Assembled Outdoor Unit and the following items:
Parts Figure Qty Parts Figure Qty Parts Figure Qty
Drain connector 1
Installation and
owner’s manual
1 ea. Seal Ring 1
Line Set Adapters
MPA018S4M-*P
MPB018S4M-*P
MLA018S4M-*P
2 adapt. – 3/8” to 1/2”
MPA030S4M-*P
MPB030S4M-*P
MLA030S4M-*P
3 adapt. – 3/8” to 1/2”
MPA036S4M-*P
MPB036S4M-*P
MLA036S4M-*P
3 adapt. – 3/8” to 1/2”
1 adapt. – 1/2” to 3/8”
MPA048S4M-*P
MPB048S4M-*P
3 adapt. – 3/8” to 1/2”
2 adapt. – 1/2” to 3/8”
Compatible Indoor Units
Indoor Unit Voltage Indoor Unit Voltage
MWMA009S4-*P
MWMA012S4-*P
MWMA018S4-*P
MWMA024S4-*P
M22A009S4-*P
M22A012S4-*P
M22A018S4-*P
1
The 24,000 Btu indoor unit is only allowed to be connected to MPA048S4M, MPB048S4M and MLA036S4M multi-zone outdoor units.
Only second generation (-2P) indoor units will work with MLA multi-zone outdoor units.
1
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
M33A024S4-*P
MMDA009S4-*P
MMDA012S4-*P
MMDA018S4-*P
MMDA024S4-*P
MCFB018S4-*P
MCFA024S4-*P
1
1
1
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
208/230V
Model Number Identication
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
018 = 1.5 ton
030 = 2.5 tons
036 = 3 tons
048 = 4 tons
M P A 018 S 4 M - 1 P
Voltage
P = 208/230V-1 phase-60hz
Minor Design Sequence
1 = 1st Revision
Refrigerant Circuits
M = Multiple Circuits
Refrigerant Type
4 = HFC-410A
Cooling Efciency
S = Standard Efciency
2
Typical Multi-Zone System Components
Filter
MPA018S4M Shown
Outdoor Unit Appearance May Vary by Capacity
Utility Bundle
One per
indoor unit
Return Air
Supply Air
Indoor unit wiring connections
(under access plate)
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.
UV-rated tape (field-provided)
Access cover for power
and control wiring
connections
Condensate drain line
(field-provided, one per
indoor unit)
Liquid line shut off valve
Gas line shut off valve
Port B
Liquid line shut off valve
Gas line shut off valve
Port A
Wiring
Condensate drain line
(wrapped in foam insulation)
Refrigerant Line Set, Condensate Line
And Indoor / Outdoor Cable
(field-provided)
TAPE
Line set
(wrapped in foam
insulation)
See Outdoor Unit wiring
diagram for individual system
wiring.
Access cover for
service valves
Liquid line shut off valve
Gas line shut off valve
Port C
Liquid line shut off valve
Gas line shut off valve
Port E
Liquid line shut off valve
Gas line shut off valve
Port D
Up to 5 ports depending on outdoor unit model
MWMA009 Shown
Up to 5 ports depending on outdoor unit model
Indoor unit type may vary
L2L1
208/230V Outdoor Unit
Terminal Block
MPA048S4M shown
Liquid and vapor line service
and shut off valves
I
MPORTANT - Condensate drain line must always
be located at the bottom of the
bundle.)
Figure 1. Typical System Shown
3
Outdoor Unit Dimensions
A
E
D
B
C
TYPICAL APPEARANCE OF UNITS
Model
MPA018S4M-*P
MPA030S4M-*P
MPA036S4M-*P
MPA048S4M-*P
MPB018S4M-*P
MPB030S4M-*P
MPB036S4M-*P
MPB048S4M-*P
MLA018S4M-*P
MLA030S4M-*P
MLA036S4M-*P
Unit of
Measurement
A B C D E
inches 35-3/4 22 27-3/8 12-3/4 13-1/8
mm 911 559 695 324 333
inches 37-1/4 25-1/4 31-7/8 15-1/2 16
mm 946 641 810 394 406
inches 36-7/8 32-7/8 54-1/2 15-3/8 16
mm 937 835 1385 391 408
inches 36 21-1/4 27-5/8 13-1/4 13-3/4
mm 914 540 702 335 350
inches 40-3/4 26-1/2 31-7/8 15-1/8 15-7/8
mm 1035 673 810 386 403
inches 41-3/4 25 52-1/2 16-3/8 15-7/8
mm 1060 634 1333 415 404
inches 40-5/8 26-1/2 31-7/8 16-5/8 15-7/8
mm 1032 673 810 422 403
inches 41-1/8 25 52-1/2 15-3/8 15-7/8
mm 1045 635 1334 391 403
Figure 2. Outdoor Unit Dimensions - Inches (mm)
Outdoor Unit Clearances
12
(305)
1
Minimum rear clearance can be 6 inches (152 mm) when mounted on brackets
and with no obstructions on the other three sides.
Figure 3. Outdoor Unit Clearances - Inches (mm)
24 (610)
24
(610)
4
79
(2007)
Air Outlet
Air Inlet
1
12
(305)
Torque Requirements for Caps and
Fasteners
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. “Table 1. Torque
Requirements” 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*m) 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
Outdoor Unit Installation
Placement Considerations
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Consider the following when positioning the unit:
• In coastal areas or other places with salty atmosphere
of sulfate gas, corrosion may shorten the life of the
unit. In coastal areas, the coil should be cleaned with
potable water several times per year to avoid corrosive
buildup (salt)
• Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the property where the unit is installed. Install the unit as far as possible from the property line
• When possible, do not install the unit directly outside
a window. Glass has a very high level of sound transmission
• Install unit level
Building Structure
Ground
Level
Figure 4. Install Unit Level
• Choose a place solid enough to bear the weight and
vibration of the unit, where the operation noise will not
be amplied
• Choose a location where the hot air discharged from
the unit or the operation noise will not be a nuisance
to neighbors
• Avoid installing the outdoor unit near a bedroom or
other places where noise may cause a problem
• There must be sufcient space to carry the unit into
and out of the site
• There must be unobstructed air ow around the air inlet and the air outlet
• The unit must not be installed in areas where a ammable gas leak may occur
• Install the outdoor 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
• Since water drains from the outdoor unit during various stages of operation, do not place anything which
may be damaged by moisture under the unit
Direct Sunlight, Rain, Snow and Ice Protection
• If the outdoor unit is subjected to prolonged exposure
to direct sunlight with temperatures over 100°F (38°C)
a canopy is recommended as illustrated in “Figure 5.
Outdoor Unit on Pedestal (Stand) and Protective Can-
opy” on page 6 or “Figure 10. Dog House-Style
Shelter” on page 7
IMPORTANT
The construction of a canopy or shade is necessary
because of an ambient limit control set to 122°F (50°C)
to protect the electronics. If the outdoor unit is placed in
direct sunlight it is possible that the limit may activate
and shut down the unit.
• Place unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil or
into unit. Construct a canopy as illustrated in “Figure 5.
Outdoor Unit on Pedestal (Stand) and Protective Can-
opy” on page 6
5
• The unit base should be elevated above the depth of
Protective canopy
Air Inlet
Air Outlet
Air Outlet
Air Inlet
12 in
305 mm
79 in
2007 mm
average snows as illustrated in “Figure 6. Outdoor Unit
on Brackets above Snow Line” on page 6
• In heavy snow areas, do not place the unit where drifting will occur as illustrated in “Figure 7. Outdoor Unit
Air Flow Obstructed by Snow” on page 6
• Carefully consider how to manage defrost water disposal to prevent ice from blocking walkways or creating a safety hazard near the outdoor unit as illustrated
in “Figure 8. Avoid Defrost Water Ice Hazard” on page
6
Protective canopy
24 in
610 mm
12 in
305 mm
Air Inlet
Air Outlet
Figure 7. Outdoor Unit Air Flow Obstructed by
Snow
Pedestal
(stand)
Side View
Front View
Pedestal
(stand)
Figure 5. Outdoor Unit on Pedestal (Stand) and
Protective Canopy
Figure 6. Outdoor Unit on Brackets above Snow
Line
Figure 8. Avoid Defrost Water Ice Hazard
Prevailing Winds
Normally wind bafes are not required for a outdoor unit.
However, in order to maximize reliability and performance,
the following best practices should be followed.
If unit coil cannot be installed away from prevailing winter
winds, some method of protecting the coil is recommended.
However, minimum clearances as reference in “Figure 3.
Outdoor Unit Clearances - Inches (mm)” on page 4
must be observed at all times.
Common application examples are:
• When prevailing winds are from the air inlet side, then
position the wind barrier a minimum of 12 inches (305
mm) from the unit as illustrated in “Figure 9. Wind Barrier”
• When prevailing wind is into the discharge side, then
position the wind barrier a minimum 79 inches (2007
mm) from the front of the unit as illustrated in “Figure
9. Wind Barrier”
• Outdoor unit can be installed in a dog house style shel-
ter as illustrated in”Figure 10. Dog House-Style Shelter”
• Outdoor unit can be installed in a alcove or under a
roof overhang as illustrated in “Figure 11. Unit installed
in Alcove”
6
Prevailing Winter Winds from Air Inlet Side
Wind Barrier
Inlet Air
Discharge Air
Wind Barrier
Prevailing Winter Winds From Air Discharge Side
12” (305mm)
Min. Distance
79” (2007mm)
Min. Distance
Figure 9. Wind Barrier
Buried Refrigerant Pipe Protection
• All refrigerant lines must be insulated regardless of if
it is buried
• In addition to insulating each line of piping, buried lines
must rest inside a sealed, watertight conduit
• The conduit must be designed so it cannot collect and
retain water
Outdoor Unit Condensate Piping
Condensate formed during the heating and defrost
processes must be drained from heat pump units. Drain
holes are provided in the base of the units to ensure proper
drainage. Heat pumps must be raised when installed on a
concrete pad or the ground to allow drainage to occur. If
the heat pump unit is installed on wall mounting bracket,
insert the provided drain connector into one of the 1
inch (25 mm) drain holes and attached a eld-provided
insulated drain hose to the connector. Use eld-provided
rubber plugs to cover any unused drain holes.
24 in
12 in
305 mm
610 mm
NOTE - Minimum clearances shown.
24 in
610 mm
Figure 10. Dog House-Style Shelter
24 in
610 mm
12 in
305 mm
NOTE - Minimum clearances shown.
12 in
305 mm
610 mm
24 in
12 in
305 mm
Drain
Connector
Chassis
Condensate Drain
(location varies per model)
Figure 12. Condensate Drain
Securing the Outdoor Unit
Slab or Roof Mounting
Install the unit a minimum of 4 inches (102 mm) above the
roof or ground surface to avoid ice build-up around the
unit. Place the unit above a load bearing wall or area of
the roof that can adequately support the unit. Consult local
codes for rooftop applications.
CAUTION
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roong material may absorb oil. This will cause
the rubber to swell when it comes into contact with oil.
The rubber will then bubble and could cause leaks.
Protect the roof surface to avoid exposure to refrigerant
and oil during service and installation. Failure to follow
this notice could result in damage to roof surface.
Figure 11. Unit installed in Alcove
7
Securing Outdoor Unit to Slab, Frame, or Rails
If the outdoor unit is installed on a eld-provided slab or
frame, use lag bolts or equivalent to secure the outdoor
unit to the slab or frame.
Four Field-provided Anchor Bolts
Figure 13. Securing Outdoor Unit to Slab
Four Field-Provided
Anchor Bolts
Figure 14. Securing Outdoor Unit to Rails
Securing Outdoor Unit To Hanging Brackets
If the outdoor unit is installed on eld-provided wall
mounting brackets, use lag bolts or equivalent to secure
the outdoor unit to the bracket. Minimum rear clearance
can be reduced to 6 inches (152 mm) when mounted
on brackets and with no obstructions on the other three
sides. Allow for condensate disposal when placing units
above one another.
6 in
152 mm
Air Inlet
Air Outlet
Figure 15. Securing Outdoor Unit to Brackets
Both lines must be individually insulated.
1. The seal on the unit refrigerant piping connections
should remain in place until the last possible moment.
This will prevent dust or water from getting into the
refrigerant piping before it is connected.
2. CAREFULLY adjust refrigerant piping connections to
suit the application.
3. Slowly loosen one of the are nuts to release the
factory nitrogen charge from the indoor units only.
4. Remove the are nuts from the connections on the
unit and discard the seal from each of the piping
connections.
5. Slide the are nuts onto the ends of the eld-provided
refrigerant piping before using a suitable aring tool to
are the end of the copper pipe.
6. Apply recommended HFC-410A refrigerant lubricant
to the outside of the ared refrigerant lines.
IMPORTANT
The compressor in this unit contains PVE
oil (Polyvinylether). PVE oil is formulated for
hydrouorocarbon (HFC) refrigerants, such as HFC-
410A, which this system contains. While it may have
some miscibility properties with mineral-based oil and
POE oil (Polyolester), it is not recommended to mix PVE
oil with any other type of refrigerant oil.
7. Align the threaded connections with the
ared refrigerant lines. Tighten the are nuts
lightly at rst to obtain a smooth match as
illustrated in “Figure 16. Making Connections
(Male to Female Connection)” on page 9.
8. Once snug, continue another half-turn on each nut
which should create a leak-free joint. A torque wrench
may be used to tighten are nuts using “Table 3.
Flare Nut Torque Recommendations” on page 9
recommendations. Do not over-tighten a ared joint.
Flared connections should always be accessible
and must be insulated to prevent condensation.
9. After refrigerant piping has been installed and checked
for leaks, apply insulation over all ared connections.
Table 2. Refrigerant Piping and Indoor Unit
Connection Sizes
Size
(Btuh)
9000 1/4 3/8
12000 1/4 1/2
18000 1/4 1/2
24000 3/8
Liquid Line
in.
Gas Line
in.
5/8
Refrigerant Piping Connections
Field piping consists of two copper lines connecting
the outdoor unit to the indoor unit. “Table 1. Torque
Requirements” lists the connection sizes. The connections
are made using the provided brass are nuts at the end of
the refrigerant piping connections.
8
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