Lennox MPA018S4S-1P, MPA024S4S-1P, MPA009S4S-1P, MPA048S4S-1P, MPB009S4S-1P Installation Instructions Manual

©

2016 Lennox Industries Inc.

Dallas, Texas, USA

Table of Contents

General ...........................................................................1

Included Parts.................................................................2

Model Number Identication ...........................................3

Indoor / Outdoor Unit Match-Ups....................................4

Typical System Components ..........................................5

System Dimensions ........................................................6

Outdoor Units................................................................6

Indoor Units ..................................................................7

System Clearances ........................................................9

Outdoor Unit .................................................................9

Indoor Unit ....................................................................9

Torque Requirements for Caps and Fasteners.............10

Indoor Unit Installation ..................................................10

Unit Placement Considerations ..................................10

Installation of Cassette Base ......................................10

Installation of M33 Cassette Cover Panel...................11

Indoor Unit Condensate Piping Connections ..............13

Outdoor Unit Installation ...............................................13

Placement Considerations ..........................................13

Direct Sunlight, Rain, Snow and Ice Protection ..........14

Prevailing Winds .........................................................15

Buried Refrigerant Pipe Protection .............................15

Outdoor Unit Condensate Piping ................................15

Securing the Outdoor Unit ..........................................16

Refrigerant Piping Connections ....................................17

Leak Test and Evacuation ............................................18

Leak Test ....................................................................18

Triple Evacuation Procedure .......................................18

Wiring Connections ......................................................19

Outdoor Unit ..............................................................19

Indoor Unit ..................................................................19

Unit Start-Up .................................................................27

Adding Refrigerant for Longer Line Set ........................27

Troubleshooting ............................................................28

Test Run .......................................................................28

Pre-Checks .................................................................28

Procedure ...................................................................28

Dry Mode Operation (Dehumidication) .......................28

Procedure ...................................................................28

Sequence of Operation ...............................................28

INSTALLATION
INSTRUCTIONS

MLA/MPA/MPB and

M22A/M33A/M33B Series

SINGLE-ZONE MINI-SPLIT SYSTEMS
(208/230V) --
Cassette-Mounted Indoor Unit
507546-06
10/2017
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

Refer to the Product Specications 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 M22A, M33A and M33B ceiling cassette indoor units

are matched with an outdoor heat pump unit to create a
mini-split 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

Installation and owner’s

manual

Paper template for

installation

1 ea.

1

1 - Assembled Outdoor Unit and the following items:

Parts Figure Quantity Parts Figure Quantity

Drain connector 1 Seal ring 1

2

Model Number Identication

CASSETTE NON-DUCTED INDOOR UNITS

M 22 A 012 S 4 - 1 P

Series Type

M = Mini-Split

Unit Type

22 = 2x2 Cassette Non-Ducted Unit
33 = 3x3 Cassette Non-Ducted Unit

Major Design Sequence

A = 1st Generation

B = 2nd Generation

Nominal Cooling Capacity

OUTDOOR HEAT PUMP UNITS

Series Type

M = Mini-Split

009 = .75 tons

012 = 1 tons

018 = 1.5 tons

024 = 2 tons
036 = 3 tons
048 = 4 tons

M P A 009 S 4 S - 1 P

Voltage

P = 208/230V-1 phase-60hz

Minor Design Sequence

1 = 1st Revision
2 = 2nd Revision

Refrigerant Type

4 = HFC-410A

Cooling Efciency

S = Standard Efciency

Voltage

P = 208/230V-1 phase-60hz

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

018 = 1.5 tons

030 = 2.5 tons

012 = 1 tons

024 = 2 tons

036 = 3 tons
048 = 4 tons

Minor Design Sequence

1 = 1st Revision

Refrigerant Circuits

S = Single Circuit

Refrigerant Type

4 = HFC-410A

Cooling Efciency

S = Standard Efciency

3

Indoor / Outdoor Unit Match-Ups

Outdoor Unit Indoor Unit Match-Up Voltage

MPA009S4S-*P M22A009S4-*P 208/230V

MPA012S4S-*P M22A012S4-*P 208/230V

MPA018S4S-*P M22A018S4-*P 208/230V

MPA024S4S-*P M33A024S4-*P 208/230V

MPA036S4S-*P M33A036S4-*P 208/230V

MPA048S4S-*P M33A048S4-*P 208/230V

MPB009S4S-*P M22A009S4-*P 208/230V

MPB012S4S-*P M22A012S4-*P 208/230V

MPB018S4S-*P M22A018S4-*P 208/230V

MPB024S4S-*P M33A024S4-*P 208/230V

MPB036S4S-*P M33A036S4-*P 208/230V

MPB048S4S-*P M33B048S4-*P 208/230V

MLA009S4S-*P M22A009S4-2P 208/230V

MLA012S4S-*P M22A012S4-2P 208/230V

MLA018S4S-*P M22A018S4-2P 208/230V

MLA024S4S-*P M33A024S4-2P 208/230V

4

Typical System Components

I

Indoor unit wiring connections
(under access plate)

Decorative panel

Indoor Unit

MPORTANT - Condensate drain line must always
be located at the bottom of the
bundle.)

Wiring

Condensate drain line

(wrapped in foam insulation)

Refrigerant Line Set, Condensat e Line

And Indoor / Outdoor Cable

(field-provided)

Line set
(wrapped in foam insulation)

Communication cable
036 and 048 only

Tape

Supply Air

Filter

Return Air

Supply Air

Wireless Remote

Control

Outdoor Unit

009-036 shown

Utility

Bundle

Access cover
for valves

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

1 2 3 L1 L2

Access cover for power
and control wiring
connections

Condensate drain line
(field-provided)

To Indoor

Unit

Communication Cable

036 and 048 only

TO INDOOR COMM. BUS

NOTEφ

Terminal Block

To Power

LEY WO
L

ARG
Y

S2

S1

XT2

Use 2-conductor
shielded wire

Supply

Liquid and vapor shut off valves

Figure 1. Typical System Shown

5

System Dimensions

A

E

D

B

C

TYPICAL APPEARANCE OF UNITS

Outdoor Units

Table 1. Outdoor Unit Dimensions - Inches (mm)

Model

MPA009S4S-*P

MPA012S4S-*P

MPA018S4S-*P

MPA024S4S-*P

MPA036S4S-*P

MPA048S4S-*P

MPB009S4S-*P

MPB012S4S-*P

MPB018S4S-*P

MPB024S4S-*P

MPB036S4S-*P

MPB048S4S-*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 40-1/4 25 53-3/4 15-3/8 16

mm 1023 635 1365 391 406

inches 33-1/8 19-1/8 21-7/8 11-7/8 11-3/4

mm 842 486 556 302 298

inches 34-1/4 20-1/4 21-7/8 13-1/8 13-3/8

mm 870 514 556 333 340

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

inches 41-1/8 25 52-1/2 16-3/8 15-7/8

mm 1045 635 1334 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 3 11 594

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

DRAIN

CONNECTION

GAS
PIPE

LIQUID

PIPE

SIDE VIEW

10-3/8

(264)

LEFT SIDE VIEW

INSTALLATION

HANGERS

LEVELING

ADJUSTMENT

NUT (4)

CEILING

Fresh Air Intake

(NOTE - Not Used)

AIR

OUTLET

21-1/2 (546)

22-1/2 (572)

BOTTOM VIEW (Body)

DIFFUSER

PANEL

AIR

INLET

23-5/8 (600)

(Ceiling Opening)

SIDE VIEW

20-5/8

(524)

AIR

OUTLET

RIGHT SIDE VIEW

22-1/2

(572)

25-1/2

(648)

Figure 2. M22A Indoor Cassette Unit Dimensions - inches (mm)

25-1/2 (648)

BOTTOM VIEW (Panel)

7

LEFT SIDE VIEW

GAS

PIPE

LIQUID

PIPE

Fresh Air Intake

(NOTE - Not Used)

26-3/4 (679)

30-3/4

(781)

A

33-1/8

(841)

DRAIN

CONNECTION

RIGHT SIDE VIEW

AIR

OUTLET

37-3/8

(949)

33-1/8 (841)

BOTTOM VIEW (Body)

DIFFUSER

PANEL

SIDE VIEW

AIR

INLET

AIR

OUTLET

Size

024 8-1/8 206

036 9-5/8 244

048 11-1/4 286

A

in. mm

Figure 3. M33A and M33B Indoor Cassette Unit Dimensions - inches (mm)

37-3/8 (949)

BOTTOM VIEW (Panel)

8

System Clearances

Outdoor Unit

12

(305)

Indoor Unit

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 4. Outdoor Unit Clearances - inches (mm)

79

(2007)

Air Outlet

36”

(914 mm)

Air Inlet

1

12

(305)

INSTALLATION

HANGERS

LEVELING

ADJUSTMENT

NUT (4)

CEILING

OUTLET

AIR

DIFFUSER

PANEL

AIR

AIR

INLET

23-5/8 (600)

(Ceiling Opening)

OUTLET

Minimum Clearance from Structural Ceiling to Drop Ceiling:

M22A009, M22A012, M22A018, M33A024 -- 10-1/4” (260 mm)

M33A036, M33A048, M33B048 -- 13” (330 mm)

Minimum Clearance to Floor - 98-1/2” (2500 mm)

Figure 5. Indoor Unit Clearances - inches (mm)

36”

(914 mm)

36”

(914 mm)

36”

(914 mm)

9

Torque Requirements for Caps and
Fasteners

When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. “Table 1. Torque
Requirements” on page 10 provides torque values for
fasteners.

IMPORTANT

Only use Allen wrenches of sufcient hardness (50Rc

- Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.

Service valve stems are factory-torqued from 9 ft.-lbs.
(12 N) 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 the condensate line will have
the shortest run to a suitable drain per local codes.

• Allow sufcient 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

Installation of Cassette Base

It is important to place the cassette unit in the center of the
area that is being conditioned. This will provide the best air
distribution.

1. If the unit is to be installed in an application that
includes a drop-down tile ceiling, remove the ceiling
tiles necessary to accommodate installation of the

four-way cassette. Before removing the drop ceiling

support grid, use a plumb line or laser device to
identify the center point of the structural ceiling. Make
sure that the ceiling is supported before removing any
of the support grid. It may be necessary to add extra
support to maintain the structural integrity of the drop
ceiling.

2. If the unit is to be installed in an application that includes
a sheet rock (plasterboard) ceiling, the installation site
must be carefully measured and the sheet rock must
be cut to accommodate the cassette unit. First, identify
the center point of the installed cassette. Use a plumb

line to transfer the center mark to the oor for future

use. Use the provided template to mark the area of the
required opening. Carefully cut the required opening.
Make sure that the removal of the required ceiling
support does not affect the structural integrity of the
ceiling. It may be necessary to add extra support.

3. Use the unit as a template or use the provided paper
template to mark the location of the hanging brackets

on the oor. Use a plumb line or a laser to transfer the

bracket positions to the main structural ceiling.

4. Make sure that the structural ceiling is able to support
the weight of the cassette unit. It may be necessary to
add extra support. If the structural ceiling is constructed

of concrete, install anchors to accept four ⅜” threaded

rods to suspend the cassette base. If the structural
ceiling includes wooden joists, use angle iron or a

10

LATCH RELEASE

BUTTONS

45º

Press latch release
buttons at the same

time to release latch.

Tilt return air grille outward,

then, lift to remove grille

from panel.

CORNER ACCESS

COVER

Remove screws and loosen

straps to remove corner

covers from panel.

Unistrut channel xed securely in place to accept the

ANGLE IRON

BOLTED IN

PLACE ACROSS

WOODEN JOISTS

WOODEN JOIST

⅜” THREADED

ROD

ANGLE IRON

ACROSS

WOODEN JOISTS

ANCHOR

CONCRETE CEILING

USING ANCHORS

⅜” THREADED

ROD

⅜” threaded rods.

5. Slide one nut and one washer onto each threaded rod.
Use electrical tape to keep the washer from failing off.

Position the nuts slightly above the nal resting place

of the four suspension brackets.

Figure 6. Suspending Methods

6. Use either a mechanical lifting device or a minimum
of two people to raise the unit and insert the threaded
rods into the suspension brackets on the cassette
base. Slide a washer and then a nut onto each rod
below each suspension bracket. Use the leveling nut
(beneath suspension bracket) to adjust the cassette
base to the correct height. Remove the electrical
tape holding the upper washers and nuts in place
and tighten each of the four nuts above the brackets
down onto the brackets. This will ensure that the unit
remains level.

7. If the unit is being installed in an application that
includes a sheet rock (plasterboard) ceiling, it is
recommended to install an access panel in a suitable

location to allow nal connection of the refrigerant

piping, condensate line and electrical connections.
This will also allow access for future maintenance. If

this is not possible, make nal connections before

installing cassette cover panel.

Installation of M33 Cassette Cover Panel

IMPORTANT

Do not place the cover panel with the diffusers face down

on the oor or other surface. Louvers will be damaged if

pressure is applied to them.

1. Carefully remove the cassette cover panel from its
protective packaging and place the panel diffuser­side-out on a clean, level surface.

2. Press the two grille latch release buttons at the same
time to release the grille as illustrated in “Figure 8.
Remove Return Air Grille”. Tilt the return air grille
outward at a 45º angle and lift the grille away from
the panel. Carefully place the return air grille off to the
side.

Figure 8. Remove Return Air Grille

3. Remove access covers from each corner of the panel.

⅜” THREADED

ROD

CASSETTE BASE

L

DROP CEILING

⅜” to ½”

LEVELING NUT

Figure 7. Suspending Hardware

SUSPENSION

BRACKET

Figure 9. Remove Corner Covers

11

REFRIGERANT

≥7/8 (22 mm)

5-3/4 (146)

⅜”

THREADED

ROD

CASSETTE
UNIT BASE

COVER PANEL

CEILING

LEVELING

NUT

air out

5/32-1/4 (4-6 mm)

CASSETTE BASE

CEILING

FOAM

INSULATION

COVER PANEL

SUPPLY AIR

LOUVER

FOAM

INSULATION

Side View Cutaway

1-7/8 (48 mm)

PIPING CONNECTIONS

CONDENSATE

DRAIN

CONNECTION

PANEL

HANGER

DETAIL B

CASSETTE BASE

HOOK

DETAIL A

DETAIL C

to make sure that the panel is properly aligned with the
cassette base.

MOTORS

d

COVER PANELLOUVER SWING

COVER PANEL

SECURING

SCREW

PHILLIPS

SCREWDRIVER

Figure 10. Install Cover Panel

4. Position the ceiling panel so that the arrow on the
panel is aligned with the arrow sticker on the cassette
base (both arrow stickers should be on the same side
of the cassette base).

NOTE: If the panel and the base are not properly aligned,

the airow will be blocked and the harness plugs

from the panel to the cassette base will not be long
enough to plug together.

5. Place the cover panel hangers on the two corners with
the louver swing motors. Place these two hangers
on the corresponding hooks on the corners of the
cassette base. See detail A in “Figure 10. Install Cover
Panel”. Then, place the other hangers from the other
two corners over their corresponding hooks on the

cassette base as shown in detail B in “Figure 10.

Install Cover Panel”.

6. Connect the six-pin harness plugs from each of the
two swing motors to the matching six-pin plugs from
the control box in the cassette base.

7. Connect the black harness from the display on the
cover panel to the corresponding black plug from the
control box in the cassette base.

8. Connect the black two-pin plug from the temperature
sensor to the corresponding black plug from the
control box in the cassette base.

9. Tighten the provided screws in the bracket in the cover
panel immediately below each panel hanger. See
detail C in “Figure 10. Install Cover Panel”. Adjust the
cover panel by turning slightly clockwise, if necessary,

Figure 11. Cover Panel in Place

11. Continue to tighten the cover panel securing screws
until the insulation between the cover panel and the
cassette base has been compressed to approximately
¼” (6 mm). The cover panel must form a seal with
the ceiling and the cassette base around the entire
perimeter of the unit.

LOOSEN UPPER NUT

CORNER PANEL

TIGHTEN LOWER NUT

Figure 12. Adjust Unit Height through Corner Panel

12. If it is necessary to adjust the cassette height after the
cover panel has been installed, access the leveling nut
through the removable access cover on each corner.

13. The return air grille must be reinstalled on the cover
panel. Align the four tabs on the grille with the four
slots in the cover panel. Tilt the panel back into place.
Press the opposite side of the cover gently until the
latches engage.

12

Indoor Unit Condensate Piping Connections

IMPORTANT

Make sure that drain piping is properly routed and
insulated to prevent both leaks and condensation.

1. Use a eld-provided hose clamp to secure the drain

line stub on the side of the cabinet to a eld-supplied

1-inch (25 mm) drain line.

NOTE: Take care not to over-tighten the hose clamps this

may damage the drain line stub.

NOTE: Connection between stub and drain line must be

watertight. Apply non hardening plumbing joint
compound if needed to ensure a watertight seal.

2. Conrm proper slope (not less than 1/4 inch per foot
(18 mm per m)) and routing of condensate lines to
ensure moisture is drained away from the indoor unit.

3. Drain should be as short as possible and should
not have any droops or kinks that would restrict

condensate ow and shall be approved resistant pipe.

There must be a 2-inch (51 mm) space between the

end of the condensate drain and the nal termination

point (ground, open drain, etc.) to ensure that the line
will drain freely.

4. After the system installation is complete, the
condensate drain line must be checked for leaks and

proper drainage. If a eld-provided condensate pump

has been installed, it must be checked to ensure proper
operation. This check is part of the start-up process
which must be done by the installing contractor.

IMPORTANT

Drain should have a slope of at least ¼ inch per foot and
should be approved corrosion-resistant pipe. You must

conrm operation of every drain and pump in the system

as part of the commissioning procedure.

7-7/8in.

2~3-15/16 in.

Cassette

Unit

Drain

(slope of at least ¼ inch per foot)

Max. 27-1/2"

3 ft. (1 m)

SUPPORT

STRAPS

Figure 14. Indoor Unit Condensate Drain

Outdoor Unit Installation

CAUTION

In order to avoid injury, take proper precaution when
lifting heavy objects.

Placement Considerations

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

Cassette Base

Drain Pan

Pour water

here for test

Drain Plug

Figure 13. Test Condensate Drain

Cap

(Remove for test)

Building Structure

Ground
Level

Figure 15. Install Unit Level

• Choose a place solid enough to bear the weight and
vibration of the unit, where the operation noise will not

be amplied

• 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

13

• There must be sufcient space to carry the unit into

Protective canopy

Air Inlet

Air Outlet

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 prolong exposure to
direct sunlight with temperatures over 100°F (38°C) a
canopy is recommended as illustrated in “Figure 16.
Outdoor Unit on Pedestal (Stand) and Protective Can­opy” or “Figure 21. Dog House-Style Shelter” on page

15.

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.

Protective canopy

24 in

610 mm

12 in

305 mm

Air Inlet

Air Outlet

Pedestal

(stand)

Side View

Front View

Pedestal
(stand)

Figure 16. Outdoor Unit on Pedestal (Stand) and

Protective Canopy

• 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

16. Outdoor Unit on Pedestal (Stand) and Protective
Canopy”

• The unit base should be elevated above the depth of
average snows as illustrated in “Figure 17. Outdoor

Unit on Brackets above Snow Line”

• In heavy snow areas, do not place the unit where drift­ing will occur as illustrated in “Figure 18. Outdoor Unit
Air Flow Obstructed by Snow”

• 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 19. Avoid Defrost Water Ice Hazard”

Figure 17. Outdoor Unit on Brackets above Snow

Line

12 in

79 in

2007 mm

Air Outlet

305 mm

Air Inlet

Figure 18. Outdoor Unit Air Flow Obstructed by

Snow

14

12 in

305 mm

24 in

610 mm

NOTE - Minimum clearances shown.

24 in

610 mm

12 in

305 mm

Figure 19. Avoid Defrost Water Ice Hazard

Prevailing Winds

Normally wind bafes 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 4.
Outdoor Unit Clearances - inches (mm)” on page 9
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 20. 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

20. Wind Barrier”

• Outdoor unit can be installed in a dog house style
shelter as illustrated in “Figure 21. Dog House-Style
Shelter”

• Outdoor unit can be installed in a alcove or under a
roof overhang as illustrated in “Figure 22. Unit installed
in Alcove”)

Prevailing Winter Winds from Air Inlet Side

Wind Barrier

Inlet Air

12” (305mm)
Min. Distance

Figure 21. Dog House-Style Shelter

24 in

610 mm

12 in

305 mm

12 in

305 mm

24 in

610 mm

NOTE - Minimum clearances shown.

Figure 22. Unit installed in Alcove

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

79” (2007mm)

Discharge Air

Wind Barrier

Prevailing Winter Winds From Air Discharge Side

Min. Distance

Figure 20. Wind Barrier

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

15

rubber plugs to cover any unused drain holes (see “Figure

23. Condensate Drain” on page 16).

Drain
Connector

Chassis

Condensate Drain
(location varies per model)

Figure 23. 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.

Four Field-Provided

Anchor Bolts

Figure 25. 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

CAUTION

Roof Damage!
This system contains both refrigerant and oil. Some

rubber roong 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.

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.

Air Outlet

Figure 26. Securing Outdoor Unit to Brackets

Four Field-provided Anchor Bolts

Figure 24. Securing Outdoor Unit to Slab

16

Refrigerant Piping Connections

Field piping consists of two copper lines connecting the
outdoor unit to the indoor unit. “Table 2. Refrigerant Piping
and Indoor Unit Connection Sizes”lists the connection
sizes. The connections are made using the provided brass

are nuts at the end of the refrigerant piping connections.

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.

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

36000

48000

A

Liquid Line

in.

3/8 5/8

CANT ON THE OUTSIDE OF

THE FLARE

Gas Line

in.

5/8

MALE FLARE

CONNECTION

B

Figure 27. Making Connections

(Male to Female Connection)

IMPORTANT

The compressor in this unit contains PVE
oil (Polyvinylether). PVE oil is formulated for

hydrouorocarbon (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 27. Making Connections
(Male to Female Connection)”.

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 17
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.

IMPORTANT

Always use two wrenches when tightening are nuts to

avoid twisting refrigerant piping. DO NOT over-tighten

are nuts.

TORQUE WRENCH

TO INDOOR

UNIT

TO OUTDOOR UNIT

Figure 28. Tighten Flare Nut

Table 3. Flare Nut Torque Recommendations

Outside

Diameter

Inches

1/4 15 ft.-lb. (20 N) 1/4 turn

3/8 26 ft.-lb. (35 N) 1/2 turn

1/2 41 ft.-lb. (56 N) 7/8 turn

5/8 48 ft.-lb. (65 N) 1 full turn

Recommended

Torque

No torque wrench available

Finger tighten and use an

appropriately sized wrench to

turn an additional:

BACKUP

WRENCH

17

Table 4. Refrigerant Line Set Requirements

OUTDOOR UNIT

OUTDOOR UNIT

INDOOR UNIT

INDOOR UNIT

Maximum Line Set
Length

Maximum Line Set

Length

Maximum

Elevation -

Outdooor

Unit BELOW

Indoor Unit

Maximum

Elevation -

Outdooor

Unit ABOVE

Indoor Unit

Minimum Line Set
Length - 10 ft. (3m)

Minimum Line Set
Length - 10 ft. (3m)

Outside Unit BELOW Indoor Unit Outside Unit ABOVE Indoor Unit

Do not allow for excess length of line sets to be left rolled up as part of the
required distance, or in general. This will also cause additional performance issues.

IMPORTANT

Each system size has a line set length and vertical elevation parameters.

Line Set Diameters (in.)

System Size (KBtu)

Liquid Gas

009 1/4 3/8 40 (12) 40 (12) 82 (25)

012 1/4 1/2 40 (12) 40 (12) 82 (25)

018 1/4 1/2 66 (20) 66 (20) 98 (30)

024 3/8 5/8 82 (25) 82 (25) 164 (50)

036/048 3/8 5/8 98 (30) 98 (30) 213 (65)

Maximum Elevation

Outdoor Unit BELOW

Indoor Unit - Feet

Leak Test and Evacuation

2. Open valve on nitrogen cylinder.

3. Pressurize the system per the pressure test

Air and moisture remaining in the refrigerant system will
have undesirable effects as indicated below:

4. Check that the system pressure remains stable. If

• Pressure in the system rises

• Operating current rises

5. After the system is found to be free of leaks:

• Cooling or heating efciency drops

• Moisture in the refrigerant circuit may freeze

• Water may lead to corrosion of parts in the refrigera­tion system

The line set between the indoor and outdoor units
must be leak tested and evacuated to remove any non­condensables and moisture from the system.

Use only oxygen-free nitrogen (OFN).

Leak Test

Use the following procedure to test for system leaks:

1. Connect the manifold gauge set and dry nitrogen gas

IMPORTANT

• When the system pressure is reduced to normal, dis-

1 3 44 303 Minimum of 10 minutes

2 15 220 1517 Minimum of 10 minutes

3 32 470 3241 Minimum of 10 minutes

4 45 650 4482

5 32 470 3241

cylinder to the liquid and gas service ports.

(Meter)

Maximum Elevation

Outdoor Unit ABOVE

Indoor Unit - Feet

(Meter)

Maximum Line

Set Length - Feet

(Meters)

specications in “Table 5. Pressure Test Specications”.

there is any movement check system for leaks.

• Close valve on nitrogen cylinder

• Relieve the nitrogen pressure by loosening the
charge hose connector at the nitrogen cylinder

connect the hose from the cylinder.

Table 5. Pressure Test Specications

Bar Psig kPa Duration

1 hour. Stress test to prove the
integrity of the complete installation.

24 hours. Lower system pressure

test, after conrmation No. 4 was

successfully completed.

18

Triple Evacuation Procedure

208/230V Outdoor Unit

Terminal Block

From Power

Supply

1 2 3 L1 L2

Terminal Block

1 2 3

208/230V Indoor Unit

Outdoor Unit Indoor Unit

A Micron or Torr gauge must be used for this procedure.

1. Discharge the oxygen-free nitrogen and evacuate the
system to a reading of 8000 Microns (8 Torr) using all
service valves.

2. Break the vacuum by allowing nitrogen into the port
connections (liquid line and gas line pipes) until a
positive pressure is achieved.

3. Evacuate the system to a reading of 5000 Microns (5
Torr).

4. Break the vacuum by allowing nitrogen into the port
connections (liquid line and gas line pipes) until a
positive pressure is achieved

5. Evacuate the system to a minimum reading of 500
Microns (0.5 Torr).

6. For a moisture-free system, ensure the vacuum is held
without movement for a minimum of 4 hours.

7. If vacuum fails to hold, carry out steps 2 through 6 until
vacuum holds.

Wiring Connections

IMPORTANT

Install unit so that unit disconnect is accessible.

Use specied wiring and cable to make electrical

connections. Clamp cables securely and make sure that
connections are tight to avoid strain on wiring. Insecure
wiring connections may result in equipment failure and

risk of re.

Wiring must be installed so that all cover plates can be
securely closed.

• Refer to unit nameplate for minimum circuit ampacity
and maximum over-current protection size

• Make all electrical power wiring connections at the out­door unit

• Be sure to reattach all electrical box covers after con­nections are complete

Indoor Unit

• All indoor units are powered by the outdoor unit

• Communication Wiring (Indoor Units 30K and Below):
Use one stranded 4-conductor wire to provide power
and communication

• Communication Wiring (Indoor Units 36K and Above):
Use one stranded 3-conductor wire to provide power
and one stranded 2-conductor wire to provide commu­nication

• Use minimum of 18 GA stranded wiring

NOTE: When installing a condensate pump, wire in-line

with the CN5 oat switch

WARNING

Electric Shock Hazard. Can cause injury or death. Unit
must be rounded in accordance with national and local
codes.

Line voltage is present at all components when unit is
not in operation. Disconnect all remote electric power
supplies before opening access panel. Unit may have
multiple power sources.

CAUTION

All terminal connections must be made as illustrated
in the following diagrams. Improperly connected wiring
could damage unit or cause communication errors
between indoor and outdoor units.

In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the
current Canadian Electrical Code (CEC).

Refer to unit nameplate for minimum circuit ampacity and
maximum over-current protection size.

Outdoor Unit

Figure 29. Single Zone Wiring

IMPORTANT

This unit must be properly grounded and protected by a
circuit breaker. The ground wire for the unit must not be
connected to a gas or water pipe, a lightning conductor
or a telephone ground wire.

Do not connect power wires to the outdoor unit until
all other wiring and piping connections have been
completed.

Do not install the unit near a lighting appliance that
includes a ballast. The ballast may affect remote control
operation.

IMPORTANT

All diagrams (Figure 31 through Figure 43) are typical
wiring diagrams. Refer to the wiring diagram on the unit
for actual wiring.

19

208/230V Outdoor Unit

TO OUTDOOR UNIT

Power Terminal Block

L1 L2

From Power

Supply

Communication Terminal Block

Outdoor Unit

S1 S2

208/230V Outdoor Unit

Power Terminal Block

L1 L2

208/230V Indoor Unit

Power Terminal Block

L1 L2

CommunicationTerminal Block

Indoor Unit

E Y XYQS1E P

S2

Outdoor Unit

Figure 30. Single Zone Wiring 36K & 48K Only

TO PROGRAMMABLE
WIRED CONTROLLER

4

Note: The programmable
wired controller and regular
wired controller use the same
wiring connector.

P5

CN1 5

M

5

Motor

2

CN13

M

PU MP

2

CN5

W ATE R L E VE L S W IT CH

TO WIRED

CONTROLLER

2

D IS P LA Y

B O A R D

2

CN 40

10

CN 10 A

CN 10

INDOOR UNIT
MAINBOARD

CN3

E Y X

Indoor Unit

Alarm
Output

Remote
Control

5

Note1: Remove the JR6 jumper
for remote o n /off contr ol

ALA RM

JR6

ON - OFF

CN23

CN3 3

CN1

C N 1 1 0

JR6

P1

CN6

4

INDOOR COIL TEMP.SENSOR

BL A C K

ROO M T EMP .SEN SOR

WH ITE

T2

T1

NOTE:
COMPONENT IN DASH
LINE IS OPTIONAL
OR FIELD WIRING.

Figure 31. M22A009S4-*P, M22A012S4-*P, M22A018S4-*P, M33A024S4-*P Unit Wiring Diagram

To LVM
Comm.Bus

1 2 3

20

Y E L L O W

R E D( B R O W N)

B L U E (B L A C K )

Y/G

Note1:remove the JR6 jumper for
remote on/off control

• • • • •
COMPONENT IN DASH
LINE IS OPTIONAL
OR FIELD WIRING.

FAN

M

Remote
Control

Alarm
Output

Note: The
programmable
wired controller
and regular
wired controller
use the same
wiring con nector

INDOOR UNIT

5

O N - OF F

JR6

C N 23

A L A R M

E Y X

CN 1 5

JR6

C N 33

CN3

To LVM
Comm.Bus

MAIN BOARD

CN2

Q E P

S1

S2

Ferr ite b e ad

To O UTDOO R
Comm .Bus

CN13

CN40

CN10(CN10A)

CN5

CN1

R E D( B R O WN )

B L U E( B L A C K )

L1

L2

CN7

CN6

P4

Y/G

2

PUMP

2

10

DISPLAY

BOARD

INDOOR COIL OUTLET TEMP.SENSOR

4

BLACK

WHITE

P1

Y/G

POWER

M

4

PROGRAMMABLE

2

CONTROLLER

5

CON TRO LLE R

INDO OR C OIL T EMP .SENS OR

ROO M T EMP .SEN SOR

WA TE R L EV E L S WIT C H

TO

WIRED

TO WIR E

T2B

T2

T1

Figure 32. M33A036S4-*P, M33A048S4-*P and M33B048S4-*P Unit Wiring Diagram

OR

CN9-1

WHITE

REACTOR

COMPRESSOR

BLACK

CN28

CN32-1

WHITE

CN29

RED

BLUE

CN30

CN7

3

DC-FAN

COMPRESSOR

DISCHARGE TEMP. SENSOR

CN3

CN22

Y/G

COIL TEMP. SENS

OUTDOOR

CN21

OUTDOOR TEMP. SENSOR

6

CRANKCASE

4-WAY

VALVE

BLUE

BROWN

1

HEATER

PAN
HEATER

2

YELLOW

BLUE

RED

3

L2

Y/G

CN31

CN26
CN27

CN16

CN1

CN2

CN33

Y/G

Figure 33. 208/230V MPA009S4S-*P and MPA012S4S-*P Outdoor Unit Wiring Diagram

21

OUT DOOR
FAN

3

CN414

CRANKCASE HEATER

4-WAY VALVE

RED

Y/G

BLACK

YELLOW

Y/G

RED

CN6

BLUE

CN3

CN4

CN8

CN7
CN2

CN6-1

Y/G

CN15

CN18

RY1

OUTDOOR

MAIN

PCB

6

OUTDOOR TEMP.SENSOR

L-OUT

WHITE

CN1

O U TD OO R C O IL
TE M P.

CN14

BLACK

CN13

CN12

BLUE

RED

BLACK

CN10

COMPRESSOR

U

V
W

1
2
3

TEMP.SENSOR

BLUE

RED

BLACK

W

COMPRESSOR

Figure 34. 208/230V MPA018S4S-*P Outdoor Unit Wiring Diagram

BLUE

BLUE

U

V

Y/G

Compressor

L-OUT

Control Board

2

CN10

BLACK

RED

Y/G

PAN HEATER

Y/G

CRANK CASE HEATER

Figure 35. 208/230V MPA024S4S-*P Outdoor Unit Wiring Diagram

RED

COMPRESSOR DISCHARGE
TEMP.SENSOR

S

YELLOW

BLACK

22

CODE PART NAME

COMP

EXV

FM1

HEAT1

HEAT2

H-PRO

L

L-PRO

SV

T3

T4

COMPRESSOR

ELECTRIC EXPANSION
VALVE

OUTDOOR DC FAN

CRANKCASE HEATER

PAN HEATER

HIGH PRESSURE SWITCH

PFC INDUCTOR

LOW PRESSURE SWITCH

4 WAY VALVE

OUTDOOR COIL TEMP.
SENSOR

OUTDOOR TEMP. SENSOR

W

COMP

Y/G

U

DRIVER BOARD

YELLOW

BLACK

RED

V

BLUE

COMPRESSOR
DISCHARGE
TEMP. SENSOR

EXV

M

FM1

5

CN55

BLACK

RED

BLUE

BLUE

BLUE

YELLOW

CN54

CN51

CN53

CN52

CN19

7

W

V

U

RED

BLACK

4 WAY

SV

VALVE

HEAT1

HEAT2

ORANGE

ORANGE

CN3

CN4

CN10

ORANGE

ORANGE

CN22

CN40

CN44

CN20

CN33

MAIN BOARD

T3

T4

H-PRO

L-PRO

7

CN8

CN9

BLACK

CN5

CN7

CN6

RED

CN34

CN12 CN11

BLACK

CN2

P-1

RED

CN1

Y/G

L

CODE

COMP

CT1

D

DCFAN1,DCFAN2

HEAT_Y

HEAT_D

H-PRO

L

L-PRO

SV

T5

T3

T4

TH

PART NAME

COMPRESSOR

AC CURRENT DETECTOR

DIODE MODULE

OUTDOOR DC FAN

CRANKCASE HEATER

PAN HEATER

HIGH PRESSURE SWITCH

PFC INDUCTOR

LOW PRESSURE SWITCH

4-WAY VALVE

DISCHARGE
TEMP. SENSOR

OUTDOOR COIL
TEMP. SENSOR

OUTDOOR TEMP. SENSOR

HEATSINK TEMP. SENSOR

YELLOW

GRAY

S2

S1

XT2

TO INDOOR COMM. BUS

NOTEP lease use 2-core

shielded wire.

Figure 36. 208/230V MPA036S4S-*P Outdoor Unit Wiring Diagram

YELLOW

L

A

CN15

6

ELECTRONIC
EXPANSION
VALVE A

Y/G

P-6

Compressor and Outdoor
Fan Control Board

W

BLACK

BLUE

V

U

COMP

U

CN55

V

W

RED

Y/G

D

RED

BLUE

CN9

DCFAN2

CN8

BLACK

CN6

CN3

7

CN7

5

CN11

5

DCFAN1

HEAT_Y

HEAT_D

CN15

CN14

RED

CN39

BLACK

12

4

RED

3

5

5

4-WAY

SV

BLACK

BLUE

BLUE

CN4

CN39

CN18

CN25

CN20

CT1

CN2

CH5

CN17

CN24

CN19

YELLOW

CN5

CN6

MAIN BOARD

TO INDOOR UNIT
POWER SUPPLY

CN3

CN1

CN22

CN12

TH

RED

BLACK

( )

2)(1

L1

L2

Y/G

BLACK

WHITE

2

TO INDOOR COMM. BUS

NOTE：

shielded wire.

9NC

T4
T3

YELLOW

01NC

RED

CN8

T5

RED

BLACK

XT1

L1

L2

MAIN

PO W ER S UP PLY

Y/G

BLAC K

RED

LLEY OW

ARG Y

S2

S1

XT2

Please use 2-core

H-PRO

L-PRO

XT1

L2

L1

MAIN

POWER SUPPLY

L2

L2

)

)
2

2

(

(

L1

1

1

( )

( )

TO INDOOR UNIT

XT3

Figure 37. 208/230V MPA048S4S-*P Outdoor Unit Wiring Diagram

23

4-WAY VALVE

OUTDOOR

FAN

CN 7

3

6

CN 31

PAN
HEATER

CN 15

CN 60

CRANKCASE
HEATER

CN 17

BLUE

BROWN

BLACK

3

2

L2

RED

BLUE

Y/G

1

Y/G

CN 21

Y/G

CN 1A

Y/G

Y/G

COMPRESSOR

Y/G

CN 50

3

U

V

W

BLUE

RED

BLACK

EXV

OUTDOOR
MAIN
PCB

OUTDOOR

TEMP. SENS OR

COMPRES S OR

DISCHARGE

T E MP. SE NS OR

OU TDOOR C OIL

T E MP. SE NSO R

RED

BLACK

WHTIE

T5

T4

T3

Figure 38. 208/230V MPB009S4S-*P and MPB012S4S-*P Outdoor Unit Wiring Diagram

Figure 39. 208/230V MPB018S4S-*P and MPB024S4S-*P Outdoor Unit Wiring Diagram

COMPRESSOR

(T4)

(T3)

(T5)

24

CO MP

MAIN B OA RD

R ED

BLACK

U

V

W

Y/G

Y/G

L

L-PRO

T3

T4

CODE PA RT NAME

COMPRESSOR

HEAT 1

4-WAY VALVE

COMP

EXV

ELECTRIC EXPANSIO N
VALVE

H-PRO

L-PRO

LOW PRESSURE SW ITCH

HIGH PRE SSURE SW ITCH

T3

T4

OUTDOOR COIL
TEMPERATURE SENSOR

OUTDOOR
TEMPERATURE SENSOR

CRANKCAS E HEATER

POWER SUPPLY

H-PRO

SV

L

PFC INDUCTOR

T5

T5

COMPRESSOR DISCHARGE
TEMP ERA TURE SENS OR

RED

BLA CK

V

U

CN19

CN51

CN55

W

EXV

BLACK

DRIVER BOARD

RED

7

7

YELLOW

BLUE

P-1

FM1

OUTDOOR DC FAN

CN53

CN20

CN34

CN3

CN4

CN10

CN40

CN22

CN44

C N8

C N9

CN7

CN2

C N1

CN5

CN54

CN52

CN33

5

CN6

SV

4-WAY
VALVE

BLUE

BLUE

HEAT2

HEAT1

BLACK

RED

BLUE

BLUE

BLUE

YELLOW

RED

BLACK

RED

BLACK

TO INDOOR COMM. BUS

XT 2

YE LLO W

GR AY

S1

S2

XT 1

L1

L2

L1

L2

2)(1

()

RED

BLAC K

MAIN

TO INDOOR UNIT
POWER SUPPLY

FM1

Y/G

BLACK

BLACK

RED

RED

HEAT 2

PAN HEAT ER

NOTE: PLEASE USE 2-CORE
SHIELDED WIRE

Figure 40. 208/230V MPB036S4S-*P Outdoor Unit Wiring Diagram

25

DR IV ER B OA RD

CODE

PART NAME

COMPRESSOR

D

HEAT 1

CT1

AC CURRENT DETECTOR

4-WAY VALVE

COMP

EXV

ELECTRIC EXPANSIO N
VALVE

H-PRO

L-PRO

LOW PRESSURE SWIT CH

HIGH PRE SSURE SWITCH

T3

T4

OUTDOOR COIL
TEMPERATURE SENSOR

OUTDOOR
TEMPERATURE SENSOR

CRANKCAS E HEAT ER

DIODE MODULE

SV

L

PFC INDUCTOR

TH

HEATSINK
TEMPERATURE SENSOR

T5

COMPRESSOR DISCHARGE
TEMPERATURE SENSOR

MAIN BOARD

FM1,FM2

OUTDOOR DC FAN

EX V

O
UTDO

OR T E MP

. S E NS OR

O
UTDO OR C O

L

I T EMP .

SE
NSO R

D

12

3

4

5

P5

CN19

CN20

CN24

CN25

CN17

FAN1

CN18

HEAT1

HEAT2

SV

4-WAY
VALVE

BLUE

RED

BLUE

CN4

CN2

CN3

CN1

CO MP

U

V

W

Y/G

CN6

CN9

10

3

CN1

CN2

L

YELLOW

YELLOW

U

V

W

BLUE

BLACK

RED

RED/WIHTE

BLACK

RED

BLACK

CH1

CT1

FM 2

FM 1

Y/G

Y/G

DC MOT OR
DR IV ER B OA RD

CON1

FAN1

CN1

FAN2

3

3

P6

2

CN6

CN3

Y/G

BLACK

TO IND OOR COMM. BUS

XT 2

YE LLO W

GR AY

S1

S2

NOTE: PLEASE USE 2-CORE
SHIELDED WIRE

L2

L1

MAIN

POWER SUPPLY

XT1

TO INDOOR UNIT

L1

Y/G

XT2

1L21

L2

1

NL

N

L

P9

P7

P8

CN22

RED

BLUE/BLACK

ORAN GE

ORA NGE

RED

BLACK

CH2

CH2

CH2

~

~

~

COM PR E S S

OR D SI

CHA RG E

T EMP .

S
E
NS

OR

HEAT 2

PAN HEAT ER

Figure 41. 208/230V MPB048S4S-*P Outdoor Unit Wiring Diagram

Figure 42. 208/230V MLA009, 012 and 018S4S-*P Outdoor Unit Wiring Diagram

26

MAIN BOARD

U

V

W

Y/G

L

L-PRO

T3
T4

CODE

PART NAME

COMPRESSOR

4-WAY VALVE

COMP

CAP1

EEV

ELECTRIC EXPANSION
VALVE

H-PRO

L-PRO

LOW PRESSURE SWITCH

HIGH PRESSURE SWITCH

T3

T4

CONDENSER
TEMPERATURE SENSOR

OUTDOOR AMBIENT
TEMPERATURE SENSOR

H-PRO

SV

L

PFC INDUCTOR

TS

DISCHARGE
TEMPERATURE SENSOR

RED

BLACK

V
U

CN1 9

CN51

CN5 5

W

EEV

BLACK

DRIVER BOARD

RED

YELLOW

BLUE

P-1

FM1

OUTDOOR DC FAN

FAN MOTOR CAPACITOR

CN53

CN20

CN3

CN4

CN10

CN40

CN22

CN44

CN8

CN9

CN7

CN2

CN1

CN5

CN54

CN52

CN33

5(6 )

CN6

SV

4-WAY1

BLUE

BLUE

HEAT2

HEAT1

BLACK
RED
BLUE

BLUE

BLUE

YELLOW

RED

BLACK

RED

BLACK

L2

TO INDOOR U NIT

POWER SU PPLY

Y/G

2

L1

1

RED

RED

BLACK

YELLOW

S

BLACK

YELLOW

Crankcase H eater

Bas e Pan Hea ter

ONLY FOR

36K ODU

L1

L2

FM1

Y/G

3

3

Y/G

COMP

3

Figure 43. 208/230V MLA024S4S-*P Outdoor Unit Wiring Diagram

Unit Start-Up

IMPORTANT

Units should be energized 24 hours before unit start-up
to prevent compressor damage as a result of slugging.

1. Inspect all factory- and eld-installed wiring for loose
connections.

2. Verify that the manifold gauge set is connected.

3. Add additional refrigerant charge if required before

4. Open the liquid and gas line service valves to release

5. Replace the stem caps and tighten to the value listed

6. Check voltage supply at the outdoor unit terminal strip.

7. Refer to the included user guide to operate the system

8. Visually check for binding of both indoor and outdoor

opening valves and while system is still under a
vacuum.

the refrigerant charge contained in outdoor unit into
the system.

in “Table 1. Torque Requirements” on page 10.

The voltage must be within the range listed on the
unit’s nameplate. If not, do not start the equipment
until you have consulted with the power company and
the voltage condition has been corrected.

using the provided remote control.

fans.

Adding Refrigerant for Longer Line Set

The outdoor unit is factory-charged with refrigerant.
Calculate the additional refrigerant required according to
the diameter and the length of the liquid pipe between the
outdoor unit and indoor unit connections.

Be sure to add the proper amount of additional refrigerant.

Failure to do so may result in reduced performance.

Table 6. Additional Refrigerant Charge

System Size

(KBtu)

09 >25 (7.5) 0.161 oz/ft (15g/m)

12 >25 (7.5) 0.161 oz/ft (15g/m)

27

18 >25 (7.5) 0.161 oz/ft (15g/m)

24 >25 (7.5) 0.322 oz/ft (30g/m)

36 >25 (7.5) 0.322 oz/ft (30g/m)

48 >25 (7.5) 0.322 oz/ft (30g/m)

Pipe Length

(feet / meters)

Amount of Refrigerant

to add

Troubleshooting

Table 7. Troubleshooting Codes

Code Description

E0 Indoor unit EEPROM error

E1 Communication error between indoor unit and outdoor unit

E3 Indoor fan speed error

E4 Indoor return air temperature sensor error

E5 Indoor coil temperature sensor error

EC Low refrigerant

EE High water level alarm

F0 Outdoor current overload sensed

F1 Outdoor ambient temperature sensor error

F2 Outdoor coil temperature sensor error

F3 Compressor discharge temperature sensor error

F4 Outdoor unit EEPROM error

F5 Outdoor unit fan speed error

P0 Inverter module IPM error

P1 High or low voltage protection

P3 Outdoor unit low temperature lockout

P4 Compressor drive error

-- Mode conict

P6 Compressor high-pressure or low-pressure switch open

4. Let each function run for 5 minutes, and perform the
following checks:

Table 8. Test Run Checklist

Checks Pass Fail

No electrical leakage

Unit is properly grounded

All electrical terminals
properly covered

Indoor and outdoor units are
solidly installed

All pipe connection points do
not leak

Water drains properly from
drain hose

All piping is properly
insulated

Unit performs COOL function
properly

Unit performs HEAT function
properly

Indoor unit louvers rotate
properly

Indoor unit responds to
remote controller

Dry Mode Operation (Dehumidication)

Test Run

Pre-Checks

Only perform test run after you have completed the
following steps:

• Electrical Safety Checks – Conrm that the unit’s
electrical system is safe and operating properly

• Refrigerant Leak Checks – Check all are nut connec-

tions and conrm that the system is not leaking

• Conrm that gas and liquid valves are fully open

Procedure

You should perform the Test Run for at least 30 minutes.

1. Connect power to the unit.

2. Press the ON/OFF button on the remote controller to
turn it on.

3. Press the mode button to scroll through the following
functions, one at a time:

• COOL - Select lowest possible temperature

• HEAT - Select highest possible temperature

Procedure

1. Using the provided wireless remote control, press the
MODE button and select DRY mode.

2. Press the UP/ DOWN button to select the desired
temperature. The temperature setting range is from
62°F (17°C) to 86°F (30°C) in one degree increments.

NOTE: The blower is preset at a low speed and cannot be

changed therefore it will get cold and most likely
will over shoot the temperature setting by 6-10°F
(3-5°C) depending on the room size or other
various factors. Also the Follow Me mode does
not operate in this mode.

NOTE: In addition, the indoor units do not have a humidistat

installed therefore they are unable to determine
humidity levels. This product is not recommend as

a main source for dehumidication.

Sequence of Operation

When in dry mode operation the unit is actually in cooling
mode with a low speed blower operation. Set remote temp
to a lower room temp to begin the dry mode operation.
The compressor will stop when the room temperature is
4°F (2°C) lower than the temperature setting.

However there is a temperature compensation for cooling
mode that is two degrees Celsius. So the unit will stop
when the temperature is 8°F (4°C) lower than the room
temperature settings.

28