Lennox MCA Series, MCA009, MCA012, MCA018, MCA024 Installation Instructions Manual

INSTALLATION

©

2018 Lennox Industries Inc.

Dallas, Texas, USA

Table of Contents

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

Use of Mini-Split System During Construction................1

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

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

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

System Dimensions ........................................................4

Outdoor Units ..............................................................4

Indoor Units .................................................................5

Indoor Unit Wall Mounts ..............................................5

System Clearances ........................................................5

Outdoor Unit ................................................................5

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

Indoor Unit ...................................................................6

Torque Requirements for Caps and Fasteners...............7

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

Unit Placement Considerations ...................................7

Determining Wall Mounting Plate Location ..................7

Installation of Wall Mounting Plate...............................7

Installation of Wall Sleeve............................................8

Installation of Indoor Unit on Wall Mounting Plate .......8

Indoor Unit Condensate Piping Connections ...............8

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

Placement Considerations ...........................................9

Direct Sunlight and Rain Protection .............................9

Buried Refrigerant Pipe Protection ............................10

Securing the Outdoor Unit .........................................10

Refrigerant Piping Connections ....................................10

Adding Refrigerant for Longer Line Set ........................12

Leak Test and Evacuation ............................................12

Leak Test ...................................................................12

Triple Evacuation Procedure......................................13

Wiring Connections ......................................................13

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

Indoor Unit .................................................................13

Wiring Diagrams (Outdoor Units) ..............................15

Wiring Diagrams (Indoor Units) .................................16

Unit Start-Up .................................................................18

Troubleshooting ............................................................18

Test Run .......................................................................18

Pre-Checks ................................................................18

Procedure ..................................................................18

Test Run Checklist ........................................................18

Double-Check Line Set Connections............................18

Ambient Temperature is Below 63ºF (17ºC) .................19

INSTRUCTIONS

MCA Series Units

SINGLE-ZONE MINI-SPLIT SYSTEM
(115V and 208/230V)
507879-01 6/2019
Supersedes 11/2018

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 li­censed professional HVAC installer (or equivalent) or a
service agency.

CAUTION

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

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.

This wall-mounted indoor unit is matched with an outdoor
air conditioner unit to create a mini-split system that uses
HFC-410A refrigerant.

Use of Mini-Split System During
Construction

Lennox does not recommend the use of its mini-split
systems during any phase of construction. Very low return
air temperatures, harmful vapors and operation of the unit

with clogged or misplaced lters will damage the system.

However, mini-split systems may be used for cooling of
buildings under construction, if the following conditions
are met:

• Air lter must be installed in the system and must be
maintained during construction.

• Air lter must be replaced upon construction comple­tion.

• The indoor wall unit assembly must be thoroughly

cleaned following nal construction clean-up.

• All mini-split operating conditions must be veried ac-
cording to these installation instructions.

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

ON/OFF

FP

TIMER

Wireless controller

MODE

ON

TEMP

TIMER

FAN/SLC

OFF

DIRECT

SLEEP

SWING

LED

FOLLOW

TURBO

CLEAN

1

Installation instruction,

user guide and warranty

1 ea.

Wireless control
holder with 2 mounting

1

screws

Batteries (AAA) 2

Return Air Filters

(Shipped installed in
indoor unit.)

WARNING

The clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs, and HFCs) as of July, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for non-compliance.

CAUTION

As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves
and protective clothing.

Mounting plate

(shipped attached to the

1

back of the indoor unit)

Mounting plate securing

screws

5

Plastic screw anchors 5

IMPORTANT

All illustrations in this instruction are typical and do
not always represent the exact appearance of the
equipment.

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.

2

Model Number Identication

OUTDOOR SINGLE ZONE AIR CONDITIONER UNITS

M C A 009 S 4 S - 1 P

Series Type

M = Mini-Split

Unit Type

C = Air Conditioner

Major Design Sequence

A = First Generation

Nominal Cooling Capacity

009 = 0.75 ton

018 = 1.5 tons

024 = 2 tons

WALL-MOUNTED INDOOR UNITS

Series Type

M = Mini-Split

Unit Type

WC = Wall-Mounted Non-Ducted Unit

012 = 1 ton

Voltage

L = 115V-1 phase-60Hz
P = 208/230V-1 phase-60Hz

Minor Design Sequence

1 = 1st Revision

Refrigerant Circuits

S = Single Circuit

Refrigerant Type

4 = HFC-410A

Cooling Efciency

S = Standard Efciency

M WC A 009 S 4 - 1 P

Voltage

L = 115V-1 phase-60Hz
P = 208/230V-1 phase-60Hz

Minor Design Sequence

1 = 1st Revision

Major Design Sequence

A = First Generation

Nominal Cooling Capacity

009 = 0.75 ton

012 = 1 ton

018 = 1.5 tons

024 = 2 tons

Refrigerant Type

4 = HFC-410A

Cooling Efciency

S = Standard Efciency

3

Typical System Components

1

2

3

4

6

7

8

9

10

5

Wall Mounting Plate

Refrigerant Piping

Signal Cable

Wireless Remote Control

Condensate Line

Louver

Wireless Remote Control Holder

Return Air Filters (2)

Front Panel

Outdoor Unit Power Cable

1

2

3

4
5

6

7
8

9

10

ON/OFF

TEMP

FP

TIMER
ON

TIMER
OFF

MODE

FAN/SLC

SLEEP

SWING

DIRECT

TURBO

CLEAN

LED

FOLLOW

19-1/8 (486)

2-3/4

(70)

11-7/8 (302)

21-7/8

(556)

30-3/8 (772)

30-5/8 (778)

2-1/2

(64)

1/2 (13)

1/2

(13)

MCA009S4S, MCA012S4S, MCA081S4S

BOTTOM VIEW

FRONT VIEWSIDE VIEW

SIDE VIEW

12-5/8

(322)

11-1/4

(286)

2-3/8 (60)

3-5/8 (92)

DRAIN HOLE (bottom of unit)

11-3/4

(298)

MCA024S4S

27-5/8

(702)

BOTTOM VIEW

FRONT VIEW

SIDE VIEW

SIDE VIEW

1/2

(13)

14-1/4 (362)

2-3/4

(70)

33-5/8 (854)

21-1/4 (540)

33-1/4 (845)

7-7/8
(200)

1-3/8 (35)

15

(381)

13-1/8

(333)

2-3/8 (60)

3-5/8 (92)

13-3/4

(349)

System Dimensions

Outdoor Units

Figure 1. Typical System Shown

Figure 2. 09, 12K and 18K Outdoor Unit Dimen-

sions - Inches (mm)

Figure 3. 24K Outdoor Unit Dimensions - Inches

(mm)

4

Indoor Units

A

B

C

TOP VIEW

FRONT VIEW

BOTTOM VIEW

SIDE VIEWSIDE VIEW

24 (610)

Air Outlet

Air Inlet

24

(610)

12

(305)

79

(2007)

1

12

(305)

1

Minimum rear clearance can be 6 inches (152 mm) when mounted on brackets

and with no obstructions on the other three sides.

MWCA018S4

6-3/4 (171)

2-1/4

(57)

12-1/2 (318)

5-3/8 (137)

Left Rear Hole

2-1/2 in. (64 mm)

diameter

38 (965)

20-3/8 (518)

5-5/8
(143)

Right Rear Hole

2-1/2 in. (64 mm)

diameter

2-1/4 (57)

Wall-Mount
Unit Outline

2-3/8 (60)

Figure 7. 18K Indoor Unit Wall Plate Dimensions -

Inches (mm)

Figure 4. Indoor Unit Dimensions - Inches (mm)

Size

9K 29-5/8 752 11-3/8 289 8-5/8 219

12K 32-3/4 832 11-3/4 298 8-3/4 222

18K 39-1/8 994 12-1/2 318 9-7/8 251

24K 44 1118 13-1/4 337 10-1/4 260

A B C

in. mm in. mm in. mm

Indoor Unit Wall Mounts

MWCA009S4

11-3/8 (289)

1-7/8

(48)

4

(102)

Left Rear Hole

2-1/2 in. (64 mm)

diameter

28-1/2 (724)

13-3/4 (349)

5-3/8
(136)

Right Rear Hole

2-1/2 in. (64 mm)

diameter

7 (178)

1-1/2 (38)

Wall-Mount
Unit Outline

2 (51)

MWCA024S4

8-5/8 (219)

1-7/8

(48)

13-1/4 (337)

2-1/2 in. (64 mm)

6-7/8 (175)

42-1/2 (1080)

Left Rear Hole

diameter

21-3/4 (553)

11-7/8

(301)

Right Rear Hole

2-1/2 in. (64 mm)

diameter

2-1/8 (54)

Wall-Mount
Unit Outline

1-7/8 (48)

Figure 8. 24K Indoor Unit Wall Plate Dimensions -

Inches (mm)

System Clearances

Outdoor Unit

Figure 5. 9K Indoor Unit Wall Plate Dimensions -

Inches (mm)

MWCA012S4

7-1/2
(191)

11-3/4 (298)

1-3/4

(44)

Figure 6. 12K Indoor Unit Wall Plate Dimensions -

31-5/8 (803)

Inches (mm)

Left Rear Hole

2-1/2 in. (64 mm)

diameter

16-3/4 (425)

9-1/8 (232)

5

(127)

Right Rear Hole

2-1/2 in. (64 mm)

diameter

1-3/4 (44)

Wall-Mount
Unit Outline

1-3/4 (44)

Figure 9. Outdoor Unit Clearances - Inches (mm)

5

Multiple Outdoor Units

FRONT VIEW

Wall

Vertical Clearance - Clearance to Floor -

72 inches (1829 mm) Minimum

96 inches (2438 mm) Recommended

5”

(127 mm)

Minimum

6” (152 mm)

Minimum Clearance

Ceiling

Wall

Floor

5”

(127 mm)
Minimum

59”

(1499 mm)

Minimum

SIDE VIEW

Any Object

10 (254)

(Minimum)

10 (254)

(Minimum)

AIR

FLOW

118 (2997)

(Minimum)

Height of

Wall (C)

Unit to

Wall (B)

CLEARANCE NOTES FOR MULTIPLE UNITS:

If the height of the wall (C) is less than or equal to the height of the smallest unit (A), the distance from the unit to the wall (B) must be a minimum of 10 inches (254 mm).

If 1/2 the height of the unit (A) is less than the height of the wall (C), the distance from the unit to the wall (B) must be a minimum of 12 inches (305 mm).

If the height of the wall (C) is greater than the height of the unit (A), the distance from the unit to the wall (B) must be a minimum of 20 inches (508 mm).

Indoor Unit

24 (610)

(Minimum)

Unit

Height (A)

AIR

FLOW

60 (1500)

(Minimum)

Figure 10. Multiple Outdoor Unit Clearances - Inches (mm)

Figure 11. Indoor Unit Clearances - Inches (mm)

6