Lennox MMDA009S4-*P, MPA012S4S-*P, MPA018S4S-*P, MMDA012S4-*P, MPB018S4S-*P Installation Instructions Manual

INSTALLATION

©

2018 Lennox Industries Inc.

Dallas, Texas, USA

Table of Contents

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

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

Indoor / Outdoor Unit Match-Ups....................................2

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

Typical System Components ..........................................4

System Dimensions ........................................................5

Outdoor Units ..............................................................5

Indoor Units .................................................................6

System Clearances ........................................................7

Outdoor Unit ................................................................7

Indoor Unit ...................................................................7

Torque Requirements for Caps and Fasteners...............8

Indoor Unit Installation ....................................................8

Unit Placement Considerations ...................................8

Installation ...................................................................8

Installation Guidelines .................................................9

Field-Relocation of Return Air Filter .............................9

Indoor Unit Condensate Piping Connections .............10

Outdoor Unit Installation ...............................................10

Placement Considerations .........................................11

Direct Sunlight, Rain, Snow and Ice Protection ......... 11

Prevailing Winds ........................................................12

Buried Refrigerant Pipe Protection ............................12

Condensate Piping ....................................................13

Securing the Outdoor Unit .........................................13

Refrigerant Piping Connections ....................................13

Leak Test and Evacuation ............................................16

Leak Test ...................................................................16

Triple Evacuation Procedure......................................16

Wiring Connections ......................................................16

Outdoor Unit .............................................................16

Indoor Unit .................................................................16

Unit Start-Up .................................................................26

Adding Refrigerant for Longer Line Set ........................26

Troubleshooting ............................................................27

Test Run .......................................................................27

Pre-Checks ................................................................27

Procedure ..................................................................27

Dry Mode Operation (Dehumidication) .......................27

Procedure ..................................................................27

Sequence of Operation ..............................................27

INSTRUCTIONS

MLA/MPA/MPB

and MMDA Series

SINGLE-ZONE MINI-SPLIT SYSTEMS
(208/230V) --
Medium-Ducted Indoor Unit
507547-06
1/2018
Supersedes 12/2017

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 MMDA Medium-Static Ducted 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

M0STAT61Q-1

Wired controller

Wired controller
extension cable
6 ft (2m)

1

1

Installation and owner’s

manual

1 ea.

1 - Assembled Outdoor Unit and the following items:

Parts Figure Quantity Parts Figure Quantity

Drain connector 1 Seal ring 1

Indoor / Outdoor Unit Match-Ups

Outdoor Unit Indoor Unit Voltage

MPA009S4S-*P or MPB009S4S-*P MMDA009S4-*P

MPA012S4S-*P or MPB012S4S-*P MMDA012S4-*P

MPA018S4S-*P or MPB018S4S-*P MMDA018S4-*P

MPA024S4S-*P or MPB024S4S-*P MMDA024S4-*P

MPA036S4S-*P or MPB036S4S-*P MMDA036S4-*P

MPA048S4S-*P or MPB048S4S-*P MMDA048S4-*P

208/230V

208/230V

208/230V

208/230V

208/230V

208/230V

MLA009S4S-*P MMDA009S4-2P

MLA012S4S-*P MMDA012S4-2P

MLA018S4S-*P MMDA018S4-2P

MLA024S4S-*P MMDA024S4-2P

208/230V

208/230V

208/230V

208/230V

2

Model Number Identication

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
036 = 3 tons
048 = 4 tons

MEDIUM-STATIC DUCTED INDOOR UNITS

M MD A 012 S 4 - 1 P

Series Type

M = Mini-Split

Unit Type

MD = Medium-Static Ducted Unit

Voltage

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

Minor Design Sequence

1 = 1st Revision

Refrigerant Circuits

S = Single Circuit

Refrigerant Type

4 = HFC-410A

Cooling Efciency

S = Standard Efciency

Voltage

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

Minor Design Sequence

1 = 1st Revision
2 = 2nd Revision

Major Design Sequence

A = 1st Generation

B = 2nd Generation

Nominal Cooling Capacity

009 = .75 tons

012 = 1 tons

018 = 1.5 tons

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

Refrigerant Type

4 = HFC-410A

Cooling Efciency

S = Standard Efciency

3

Typical System Components

IMPORTANT - Condensate drain line must always

Indoor Unit

Supply Air

Opening

be located at the bottom of the
bundle.)

Indoor unit wiring connections
(under access plate)

Wiring

Condensate drain line

(wrapped in foam insulation)

Refrigerant Line Set, Condensate Line

And Indoor / Outdoor Cable

UV-rated tape (field-provided)

Line set
(wrapped in foam insulation)

Communication cable
036 and 048 only

Tape

(field-provided)

Filter

Return Air

Liquid and vapor shut off valves

Wired Remote

Control

Outdoor Unit

009-036 shown

Utility

Bundle

Access cover
for valves

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
Condensate drain
from indoor unit

Unit

Communication Cable

036 and 048 only

XT2

TO INDOOR COMM. BUS

NOTEφ

To Power

Supply

LLEY

ARG Y

WO

S2

S1

Use 2-conductor
shielded wire

Figure 1. Typical System Shown

4

System Dimensions

A

E

D

B

C

TYPICAL APPEARANCE OF UNITS

Outdoor Units

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 870 514 552 311 594

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

Figure 2. Outdoor Unit Dimensions - inches (mm)

5

Indoor Units

FRESH AIR INTAKE

3-5/8 (92) Diameter (015 thru 018)

5 (127) Diameter (024 thru 048)

SIDE VIEW

MOUNTING

LUGS (4)

D

C

CONDENSATE

GRAVITY

DRAIN

MOUNTING

LUGS (4)

P

1 (25) 1 (25)

N

TOP VIEW

H

I

J

F

M

SUPPLY AIR

OPENING

G

A
E

FRONT VIEW

OPTIONAL BOTTON

RETURN AIR OPENING

BOTTOM VIEW

3/4 (19)3/4 (19)

ELECTRICAL

CONTROL

P

B

CONDENSATE
PUMP DRAIN

GRAVITY
CONDENSATE
DRAIN

AIR FILTER

ELECTRICAL

CONTROL

BOX

LIQUID

PIPE

BOX

GAS
PIPE

Size

RETURN AIR

OPENING

K

REAR VIEW

A B C D E F G H

in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm

L

AIR FILTER

009 thru 012 27-5/8 702 8-1/4 210 25 635 22-1/2 572 31-1/8 791 2-5/8 67 19-1/2 495 1-3/8 35

018 36-1/4 921 8-1/4 210 25 635 22-1/2 572 39-3/4 1010 2-5/8 67 28 711 1-3/8 35
024 36-1/4 921 10-5/8 270 25 635 22-1/2 572 39-3/4 1010 2-5/8 67 28 711 1-3/8 35
036 44-7/8 1140 10-5/8 270 30-1/2 775 28 711 48-1/2 1232 2-5/8 67 36-3/4 933 1-3/8 35
048 47-1/4 1200 11-7/8 302 34-1/8 867 31-1/2 800 50-3/4 1289 3-1/8 79 38-1/8 968 1-1/2 38

Size

J K L M N P

in. mm in. mm in. mm in. mm in. mm in. mm

009 thru 012 4-5/8 117 23-1/2 597 7-7/8 200 3-1/8 79 29-1/8 740 13-3/4 349

018 4-5/8 117 32 813 7-7/8 200 3-1/8 79 37-3/4 959 13-3/4 349
024 7 178 32 813 10-1/4 260 3/4 19 37-3/4 959 13-3/4 349
036 7 178 40-3/4 1035 10-1/4 260 3/4 19 46-1/2 1181 19-1/4 489
048 8 203 43 1092 11-3/8 289 1-3/4 44 48-7/8 1241 19-5/8 498

Figure 3. MMDA Indoor Ducted Unit Dimensions - Inches (mm)

6

System Clearances

Outdoor Unit

Indoor Unit

12

(305)

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)

Wall

20” (508 mm) Minimum Service Clearance

79

(2007)

Air Outlet

Air Inlet

1

12

(305)

Wall

Air

DUCTED

UNIT

Flow

24” (610 mm)

Minimum

Service

Clearance

TOP VIEW

Ceiling

1” (25 mm) Minimum Clearance

1” (25 mm) Minimum Clearance

FRONT VIEW

CeilingSuspended

24” (610 mm)

Minimum
Service
Clearance

Figure 5. Indoor Unit Clearances - Inches (mm)

7

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 sufcient 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 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

1. Make sure that the structural ceiling or slab is able
to support the weight of the indoor unit. It may be
necessary to add extra support.

2. Install suspension rods in the structural
ceiling or concrete slab in a suitable location.
If the structural ceiling is constructed of concrete, install

anchors to accept four ⅜” threaded rods to suspend

the indoor unit. If the structural ceiling includes

wooden joists, use angle iron or Unistrut channel xed
securely in place to accept the ⅜” threaded rods.

NOTE: Threaded rod is the ONLY acceptable method of

suspending the unit; do not use chains or straps.
See “Figure 6. Suspending Methods”.

⅜” THREADED

CONCRETE CEILING

USING ANCHORS

ANCHOR

ANGLE IRON

BOLTED IN

PLACE ACROSS

WOODEN JOISTS

⅜” THREADED

ROD

ANGLE IRON

WOODEN JOISTS

WOODEN JOIST

ROD

ACROSS

Figure 6. Suspending Methods

3. 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. See”Figure 7.
Suspending Hardware”

8

4. Use either a mechanical lifting device or a minimum of

INDOOR UNIT

LEVELING

NUT

⅜” THREADED

ROD

SUSPENSION

BRACKET

SUPPLY AIR

OPENING

FRONT VIEW

When unit is
level, tighten

nut to secure

position of

suspension

bracket on

rod.

Remove the return air filter from its existing location at
the rear of the unit.

Remove the screws that secure the filter frame to the
rear of the unit and set the frame aside.

Remove the screws that secure the return air cover
plate to the bottom of the unit. Set the cover plate aside.

e

Side rail

Dentilation panel

1

2

RETURN AIR

FILTER FRAME

RETURN AIR

COVER PLATE

Re-install the return air filter in the repositioned filter
frame in the bottom of the unit. Refer to the arrows in the
illustration below.

two people to raise the unit and insert the threaded rods
into the suspension brackets on the unit chassis. Slide
a washer and then a nut onto each rod below each
suspension bracket. Use the leveling nut (beneath
suspension bracket) to adjust the unit 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.

Figure 7. Suspending Hardware

5. If necessary, install a eld-provided isolation grommet
as shown in “Figure 8. Isolation Grommet” to prevent
transmission of vibration from unit to structural ceiling.

6. If the unit is being installed in an application that includes
a sheet rock (plasterboard) ceiling, it is required that
an access panel be installed in a suitable location.
This will also allow access for future maintenance.
Access is required during the start up process to test
the condensate disposal system. See “Figure 13.
Condensate Drain Test” on page 10.

7. The unit is factory-congured for the supply air to be

delivered from the front and the return air lter at the
rear of the unit. The return air lter location can be
relocated in the eld for bottom return air lter access,

if more convenient. See “Figure 8. Isolation Grommet”.

• Use exible joints (canvas) at the point where the duct
connects to the unit on both ends. Material must meet
all local and national code requirements

• When unit is being installed in a location where even
the slightest noise would be a problem (meeting room
or other very quiet space), design duct system to avoid
transmission of vibration to the structure to the extent
possible

• Follow ACCA manual D guidelines for return air l-

ter grille sizing. The return air lter grille should have

a minimum surface area of 200 square inch per ton
(1290 cm2 per 3.5kW)

Field-Relocation of Return Air Filter

Depending on installation requirements, the return air lter

may need to be relocated as a bottom return air. See
“Figure 9. Field-Relocation of Return Air Filter (Typical) -

Bottom Return Air” on page 9 for eld-relocating the
return air lter.

⅜” THREADED

ROD

FIELD-PROVIDED

ISOLATION GROMMET

WASHER

LEVELING

NUT

Figure 8. Isolation Grommet

NOTE: No part of the suspended ceiling, or other supports

not directly associated with the indoor unit

installation, can be xed to, or touch the indoor

Installation Guidelines

• Provide separate support for the weight of the duct

unit, in any form. Minimum clearances must be
observed at all times.

system. Duct system must not be supported by the
indoor unit

SUSPENSION

BRACKET

Figure 9. Field-Relocation of Return Air Filter

(Typical) - Bottom Return Air

9

Indoor Unit Condensate Piping Connections

INSULATION

INDOOR

UNIT

CONDENSATE

LINE STUB

HOSE CLAMP

FLEXIBLE DRAIN

CONNECTOR

PVC DRAIN

PIPE

SUSPENSION RODS

DRAIN LINE

STRUCTURAL CEILING

8 in.

(203 mm)

Max. 28 in.

SUPPORT

STRAPS

3 ft. (1 m)

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 unit chassis to a eld-supplied

1” (25 mm) drain line.

NOTE: Take care not to over-tighten the hose clamp as

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.

Figure 10. Condensate Gravity Drain Option

2. For applications including an indoor unit and a gravity
drain. In this case, ensure that the drain line is properly
sloped (no less than 1/4 inch per foot (18 mm per m))
and condensate lines are routed to ensure moisture is
drained away from the indoor unit.

Structural Ceiling

Anti-siphon vent must extend above the
height of the coil drain pan by 2” (51 mm).

4. In all cases, drain should be as short as possible and
should not have any droops or kinks that would restrict

condensate ow and shall be constructed using an

approved 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.

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.

5. After system installation is complete, the condensate
drain line must be checked for leaks and the condensate
pumps must be checked to ensure proper operation.
This check is part of the start-up process which must be
done by the installing contractor. Turn the condensate
drain pan test cover latch counterclockwise to open
the cover and access the drain pan. Funnel enough
water to engage the pump into the drain pan through

a exible tube.

6. Operate the system in the cooling mode. If the internal
pump is being used, ensure that the pump is operating
and the water in the pan is draining freely. If the internal
pump is not being used, pour the water into the drain

pan and conrm that it has owed freely out of the

pan and out of the drain termination. If a leak is found,
shut down power to the unit at once and do not restore
power to the unit until the problem has been resolved.

7. Return the test cover and turn the latch clockwise to
re-lock it.

1 ft.

Suspension Rods

Indoor Unit

Do not operate unit without condensate drain trap.

NOTE - Drain line should be sloped 1/4 inch per foot (18 mm per m)
AWAY from unit and should be supported as needed to prevent sagging.

Do not overtighten drain fitting.

(305 mm) max

Clean Out
Do not glue

3”

3”

Figure 11. Slope Condensate Drain

3. For applications including an indoor unit using the
internal drain pump.

Figure 12. Condensate Drain with Factory

Condensate Pump

3 ft.

(1 m)

Support

straps

Drain line

COVER LATCH

DRAIN PAN

TEST COVER

OSE

PE

N

CL

D

O

D

O

E

PE
N

CLOS

(Turn latch

counterclockwise

to unlock)

FUNNEL WATER INTO
PAN THROUGH TUBE

FOR TEST

Figure 13. Condensate Drain Test

Outdoor Unit Installation

CAUTION

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

10

Placement Considerations

Air Inlet

Air Outlet

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

opy” or “Figure 20. Dog House-Style Shelter” on page
12

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

15. Outdoor Unit on Pedestal (Stand) and Protective

Canopy”

• The unit base should be elevated above the depth of

average snows as illustrated in “Figure 16. Outdoor
Unit on Brackets above Snow Line”

• In heavy snow areas, do not place the unit where drift-

ing will occur as illustrated in “Figure 17. 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 18. Avoid Defrost Water Ice Hazard”

Ground
Level

Figure 14. 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

• There must be sufcient 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

Protective canopy

Air Outlet

Pedestal

(stand)

Side View

12 in

305 mm

Air Inlet

Protective canopy

24 in

610 mm

Front View

Pedestal
(stand)

Figure 15. Outdoor Unit on Pedestal (Stand) and

Protective Canopy

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 15.
Outdoor Unit on Pedestal (Stand) and Protective Can-

Figure 16. Outdoor Unit on Brackets above Snow

Line

11

Air Outlet

Air Inlet

12 in

305 mm

79 in

2007 mm

Prevailing Winter Winds from Air Inlet Side

12 in

305 mm

24 in

610 mm

12 in

305 mm

24 in

610 mm

NOTE - Minimum clearances shown.

Wind Barrier

Inlet Air

Discharge Air

Wind Barrier

12” (305mm)
Min. Distance

79” (2007mm)
Min. Distance

Figure 17. Outdoor Unit Air Flow Obstructed by

Snow

Figure 18. 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 7

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 19. 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

19. Wind Barrier”

• Outdoor unit can be installed in a dog house style
shelter as illustrated in “Figure 20. Dog House-Style
Shelter”

• Outdoor unit can be installed in a alcove or under a
roof overhang as illustrated in “Figure 21. Unit installed
in Alcove”

Prevailing Winter Winds From Air Discharge Side

Figure 19. Wind Barrier

24 in

12 in

305 mm

610 mm

NOTE - Minimum clearances shown.

24 in

610 mm

12 in

305 mm

Figure 20. Dog House-Style Shelter

Figure 21. 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

12

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 (see “Figure

22. Condensate Drain” on page 13).

Four Field-provided Anchor Bolts

Figure 23. Securing Outdoor Unit to Slab

Four Field-Provided

Anchor Bolts

Drain
Connector

Chassis

Condensate Drain
(location varies per model)

Figure 22. 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 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.

Figure 24. 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 25. Securing Outdoor Unit to Brackets

Refrigerant Piping Connections

Field piping consists of two copper lines connecting the
outdoor unit to the indoor unit. “Table 3. 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.

1. Choose the correct pipe sizes for your application
using “Table 3. Refrigerant Piping and Indoor Unit
Connection Sizes” on page 14.

13

2. Conrm that you are using the correct diameter piping.

90

Lean

Crude

Burr

o

3. Determine the necessary piping length required for the
application.

4. Cut the selected pipes with a pipe cutter. Make the

cuts at and smooth as illustrated in “Figure 26.

Cutting Pipe”.

13. 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.

14. Apply recommended HFC-410A refrigerant lubricant

to the outside of the ared refrigerant lines.

IMPORTANT

The compressor in this unit contains PVE oil
(Polyvinyl ether). 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.

15. 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 26. Cutting Pipe

5. Insulate the copper piping.

6. Insert a are nut onto each pipe before aring.

7. Use “Table 2. Flaring Pipe” to properly are the pipe.

Table 2. Flaring Pipe

Flare Dimension

Pipe Diameter

1/4” (6.35) 8.3 8.7

3/8” (9.62) 12.0 12.4

1/2” (9.52” 15.4 15.8

5/8” (15.9) 18.6 19.1

3/4” (22.9) 22.9 23.3

A (mm)

Min Max

Flare Shape

90

A

+

°

-

4

45

°

R0.4~0.8

8. After aring the pipe, temporarily sealed pipe ends with
adhesive tape to avoid contaminants from entering the
pipes.

9. 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.

10. CAREFULLY adjust refrigerant piping connections to
suit the application.

11. Slowly loosen one of the are nuts to release the
factory nitrogen charge from the indoor units only.

12. Remove the are nuts from the connections on the
unit and discard the seal from each of the piping
connections.

Table 3. 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 5/8

36000 & 48000 3/8 5/8

A

B

Liquid Line

in.

Gas Line

in.

CANT ON THE OUTSIDE OF

THE FLARE

MALE FLARE

CONNECTION

Figure 27. Making Connections

(Male to Female Connection)

16. 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

4 recommendations (“Table 4. Flare Nut Torque
Recommendations and Tightening Procedure” on
page 15). Do not over-tighten a ared joint.

Flared connections should always be accessible
and must be insulated to prevent condensation.

17. After refrigerant piping has been installed and checked

for leaks, apply insulation over all ared connections.

14

Table 4. Flare Nut Torque Recommendations and Tightening Procedure

TORQUE WRENCH

TO INDOOR

UNIT

TO OUTDOOR UNIT

BACKUP

WRENCH

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

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:

Table 5. Refrigerant Line Set Requirements

IMPORTANT

Always use two wrenches when tightening are
nuts to avoid twisting refrigerant piping. DO NOT
over-tighten are nuts.

System Size (KBtu)

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)

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

Line Set Diameters (in.)

Liquid Gas

Outdoor Unit BELOW

Maximum Elevation

Indoor Unit - Feet

(Meter)

15

Maximum Elevation

Outdoor Unit ABOVE

Indoor Unit - Feet

(Meter)

Maximum Line

Set Length - Feet

(Meters)

Leak Test and Evacuation

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

• Pressure in the system rises

• Operating current rises

• 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.

Leak Test

Use the following procedure to test for system leaks:

1. Connect the manifold gauge set and dry nitrogen gas
cylinder to the liquid and gas service ports

2. Open valve on nitrogen cylinder

3. Pressurize the system per the pressure test

specications in “Table 6. Pressure Test Specications”

4. Check that the system pressure remains stable. If
there is any movement check system for leaks

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

• Close valve on nitrogen cylinder.

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

• When the system pressure is reduced to normal,
disconnect the hose from the cylinder.

4. Break the vacuum by allowing nitrogen into the port
connections (liquid 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

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).

Table 6. Pressure Test Specications

Bar Psig kPa Duration

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

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.

IMPORTANT

Use only oxygen-free nitrogen (OFN).

Triple Evacuation Procedure

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 and gas line pipes) until a positive
pressure is achieved.

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

Outdoor Unit

• 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 24K 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 15 GA stranded wiring.

• When installing a condensate pump, wire in-line with

the CN5 oat switch.

16

IMPORTANT

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

From Power

Supply

Indoor Unit

CommunicationTerminal Block

L1 L2

Power Terminal Block

208/230V Outdoor Unit

L1 L2

L1 L2

Power Terminal Block

208/230V Outdoor Unit

Power Terminal Block

208/230V Indoor Unit

S1 S2

Communication Terminal Block

Outdoor Unit

E Y XYQS1E P

S2

Outdoor Unit

Indoor Unit

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

Figure 28. Single-Zone Wiring 24K and Below

Figure 29. Single-Zone Wiring 36K and 48K Only

17

System and Terminal

Designations

Indoor to Outdoor

Wiring

(Communication/

Power)

1, 2, 3 and GND

Table 7. Single Zone Installation Wiring Requirements

System Capacity System Voltage

09K and 12K 208/230VAC 4

Number of

Conductors

Wire Type Wire Gauge / MCA

Stranded and

unshielded

16AWG

Outdoor to Main Power

L1, L2 and GND

Indoor to Outdoor

Wiring

(Communication/

Power)

1, 2, 3 and GND

Outdoor to Main Power

L1, L2 and GND

Indoor to Outdoor

Wiring

(Communication/

Power)

1, 2, 3 and GND

Outdoor to Main Power

L1, L2 and GND

Indoor to Outdoor

Wiring

(Power only)

L1, L2 and GND

Indoor to Outdoor

Wiring

(Communication only)

(S1, S2 and GND)

09K and 12K 208/230VAC 3

18K 208/230VAC 4

18K 208/230VAC 3

24K 208/230VAC 4

24K 208/230VAC 3

36K 208/230VAC 3

36K 208/230VAC 3 Stranded and shielded 24AWG

Stranded and

unshielded

Stranded and

unshielded

Stranded and

unshielded

Stranded and

unshielded

Stranded and

unshielded

Stranded and

unshielded

16AWG / 9A

16AWG

14AWG / 18A

16AWG

12AWG / 20A

16AWG

Outdoor to Main Power

L1, L2 and GND

Indoor to Outdoor

Wiring

(Power only)

L1, L2 and GND

Indoor to Outdoor

Wiring

(Communication only)

(S1, S2 and GND)

Outdoor to Main Power

L1, L2 and GND

MCA = Minimum Circuit Amps

36K 208/230VAC 3

48K 208/230VAC 3

48K 208/230VAC 3 Stranded and shielded 24AWG

48K 208/230VAC 3

Stranded and

unshielded

Stranded and

unshielded

Stranded and

unshielded

10AWG / 30A

16AWG

8AWG / 35A

18

3

M

FAN

CN3

CN1 3

D C M OT O R

D R IV E R MO D U L E

5

CN1 5

INDOOR UNIT
MAIN BOARD

CN9

CN3

E Y X

Y/G

To LVM
Comm.Bus

Alarm
Output

ALA R M

CN3 3

C N 1

RED

Remote
Control

ON/ OFF

CN2 3

C N 2

C N 41

BLACK

FILTER-BOA RD

CN13

CN40

CN10

CN6

CN5

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

RE D

CN 8

CN 1 8

2

2

10

4

PUMP

DISPLAY

BOARD

BLACK

WHITE

WA TE R L EV EL SW IT CH

YELLOW

BLACK

RED

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

M

4

PROGRAMMABLE

2

INDOOR COIL TEMP. SENSOR

1

WIRED

CONTROLLER

5

TO WIRED

CONTROLLER

ROOM TEMP. SENSOR

3

2

TO

T2

T1

Y/G

Figure 30. MMDA009S4-*P, MMDA012S4-*P, MMDA018S4-*P Ducted Units Wiring Diagram

3

Alarm

Remote

M

FAN

CN3

CN1 3

D C M OT O R

D R IV E R MO D U L E

5

CN1 5

Output

ALA R M

CN3 3

Control

ON/ OFF

CN2 3

INDOOR UNIT
MAIN BOARD

CN9

CN3

C N 1

C N 2

RED

C N 41

BLACK

FILTER-BOA RD

E Y X

To LVM
Comm.Bus

Y/G

CN13

CN40

CN10

CN6

CN5

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

RE D

CN 8

CN 1 8

2

2

10

4

PUMP

DISPLAY

BOARD

BLACK

WHITE

WA TE R L EV EL SW IT CH

YELLOW

BLACK

RED

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

M

4

PROGRAMMABLE

2

INDOOR COIL TEMP. SENSOR

1

WIRED

CONTROLLER

5

TO WIRED

CONTROLLER

ROOM TEMP. SENSOR

3

2

TO

T2

T1

Y/G

Figure 31. MMDA024S4-*P Ducted Units Wiring Diagram

19

To LVM
Comm. Bus

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

CN40

2

Note: The
programmabl e
wired cont roller
and regula r
wired cont roller
use the same
wiring con nector

PROGRAMMABLE

4

2

TO

WIRE

CONTROLLER

Figure 32. MMDA036S4-*P & MMDA048SA-*P Ducted Units Wiring Diagram

OR

CN9-1

WHITE

REACTOR

COMPRESSOR

BLACK

CN28

CN32-1

WHITE

RED

CN29

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

20

OUT DOOR
FAN

3

CN414

CRANKCASE HEATER

RED

Y/G

4-WAY VALVE

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 UTD OOR C O IL
TEM P.

CN14

BLACK

CN13

CN12

BLUE

RED

BLACK

CN10

COMPRESSOR

U
V

W

TEMP.SENSOR

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

BLUE

1

RED

2

BLACK

3

W

COMPRESSOR

BLUE

BLUE

U

V

Y/G

Compressor

L-OUT

Control Board

2

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

CN10

YELLOW

BLACK

21

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

V

Y/G

U

DRIVER BOARD

YELLOW

BLACK

RED

BLUE

L

BLACK

RED

BLUE

BLUE

BLUE

YELLOW

CN54

CN51

CN53

CN52

COMPRESSOR
DISCHARGE
TEMP. SENSOR

EXV

M

FM1

5

CN55

CN19

7

W

V

U

RED

BLACK

SV

HEAT1

HEAT2

4 WAY
VALVE

ORANGE

ORANGE

ORANGE

CN3

CN4

CN10

ORANGE

CN22

CN40

CN44

CN33

MAIN BOARD

T3

T4

H-PRO

L-PRO

7

CN8

CN9

BLACK

CN5

CN7

CN6

RED

CN20

CN34

CN12 CN11

BLACK

CN2

P-1

RED

CN1

Y/G

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

22

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. S ENS OR

COMPRES S OR

DISCHARGE

T E MP. S E NS OR

OU TDOOR C OIL

T E MP. S E NS OR

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

23

COMPRESSOR

(T5)

(T3)

(T4)

CO MP

MAIN B OA RD

R ED

BLACK

U

V

W

Y/G

Y/G

L

L-PRO

T3

T4

CODE PART NAME

COMPRESSOR

HEAT 1

4-W AY VALVE

COMP

EXV

ELECTRIC EXPANSIO N
VALV E

H-PRO

L-PRO

LOW PRESSURE SWIT CH

HIGH PRE SSURE SW IT CH

T3

T4

OUTDOOR COIL
TEMPERATURE SENSOR

OUTDOOR
TEMPERATURE SENSOR

CRANKCAS E HEAT ER

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 INDO OR 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

FM 1

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

24

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 E MP .

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 LLOW

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 E MP .

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

25

COMP

YELLOW

CODE

COMP

CAP1

EEV

FM1

H-PRO

L-PRO

SV

TS

T3

T4

BLACK

W

RED

V

BLUE

U

DRIVER BOARD

BLACK

RED

BLUE

BLUE

BLUE

YELLOW

L

PART NAME

FAN MOTOR CAPACITOR

ELECTRIC EXPANSION
VALVE

OUTDOOR DC FAN

HIGH PRESSURE SWITCH

L

PFC INDUCTOR
LOW PRESSURE SWITCH

4-WAY VALVE

DISCHARGE
TEMPERATURE SENSOR
CONDENSER
TEMPERATURE SENSOR

OUTDOOR AMBIENT
TEMPERATURE SENSOR

FM1

3

3

CN5 5

CN1 9

W
V
U

RED

CN54

CN51

BLACK

CN53

CN52

COMPRESSOR

Y/G

4-WAY1

SV

HEAT1

Crankcase H eater

HEAT2

Bas e Pan Hea ter

36K ODU

ONLY FOR

T3
T4

BLUE

H-PRO

L-PRO

BLUE

CN3

CN4

CN10

CN8

CN9

CN7

CN33

CN22
CN40
CN44

MAIN BOARD

BLACK

CN5

CN6

RED

Y/G

EEV

5(6 )

CN20

RED

BLACK

1

2

TO INDOO R UNIT

YELLOW

L1

3

S

CN2

CN1

P-1

BLACK

RED

L2

L1

L2

POWER SU PPLY

YELLOW
BLACK

RED

Y/G

Y/G

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
opening valves and while system is still under a
vacuum.

4. Open the liquid and gas line service valves to release
the refrigerant charge contained in outdoor unit into
the system.

5. Replace the stem caps and tighten to the value listed
in “Table 4. Flare Nut Torque Recommendations and
Tightening Procedure” on page 15.

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

7. Refer to the included user guide to operate the system
using the provided remote control.

8. Visually check for binding of both indoor and outdoor
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 8. 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)

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

26

Troubleshooting

Table 9. Indoor Unit Troubleshooting Codes

Display Description

E0 Indoor unit EEPROM error

E1 Communication error between indoor and outdoor units

(E2 for outdoor code)

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 (for ducted units only)

F0 Outdoor current overload sensed Note: (outdoor unit

display --) two dashes

F1 Outdoor ambient temperature sensor error (T4

malfunction) outdoor unit display E4

F2 Outdoor coil temperature sensor error (T3) Malfunction

outdoor unit display E4

F3 Compressor discharge temperature sensor error (T5)

Malfunction outdoor unit display E4

F4 Outdoor unit EEPROM error - outdoor display E0

F5 Outdoor unit fan speed error - outdoor Error display E8

P0 Inverter module IPM error - outdoor display P6

P1 High or low voltage protection - outdoor display E5

P3 Outdoor unit low temperature lockout - outdoor unit

display LP

P4 Compressor drive error

P6 Mode conict

P7 Compressor high- or low-pressure switch open - outdoor

unit display P2

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 liquid and gas 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

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)

Procedure

1. Using the provided wired 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.

27

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