mars CMA Series Horizontal Side Discharge Condensing Air Conditioners Installation Guide

CMA Series Horizontal Side Discharge Condensing Air Conditioners

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Specifications

• Model Numbers: CMA1512SA-1, CMA1518SA-1, CMA1524SA-1,
  CMA1530SA-1, CMA1536SA-1, CMA1548SA-1

• Installation: Horizontal/Side Discharge Condensing Units

Product Information

The Horizontal/Side Discharge Condensing Units are designed for
efficient air conditioning. This product comes with safety
precautions and guidelines to ensure proper installation and
operation.

Product Usage Instructions

Safety Precautions

Before installation or operation, carefully read the manual
provided. Ensure the appliance is intact and undamaged.
Modifications or alterations to the appliance are not allowed for
safety reasons.

Warnings for Product Use

Ensure proper ventilation in the room to avoid oxygen deficiency
and carbon monoxide build-up. Improper installation, adjustment, or
maintenance can lead to hazards. Installation and service must be
done by a licensed professional HVAC installer or equivalent.

Warnings for Cleaning and Maintenance

Handle the equipment with care to avoid injury. Wear gloves and
protective clothing while cleaning or maintaining the unit.

Electrical Warnings

Do not attempt to repair electrical components unless qualified.
Improper handling can result in injury.

Fuse Specifications

The air conditioner’s circuit board is equipped with a fuse for
overcurrent protection. Replace the fuse with an identical
component as specified on the circuit board (e.g., T5A/250VAC,
T10A/250VAC).

FAQ

Q: Can I install the unit myself?

A: Installation and service must be performed by a licensed
professional HVAC installer or equivalent to ensure safety and
warranty claims.

Q: How often should I clean the unit?

A: Regular cleaning and maintenance are recommended to ensure
optimal performance. Handle the equipment with care and wear
protective gear.

Q: What should I do in case of a fuse blowout?

A: If the fuse blows out, replace it with an identical component
following the specifications indicated on the circuit board.

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Installation Manual
Horizontal/Side Discharge Condensing Units
Model CMA1512SA-1 CMA1518SA-1 CMA1524SA-1 CMA1530SA-1 CMA1536SA-1 CMA1548SA-1
IMPORTANT NOTE: Read this manual carefully before installing or operating your new air conditioning unit. Make sure to save this manual for future reference.
517.787.2100 · www.marsdelivers.com

IOM – Horizontal/Side Discharge Condensing Units
INSTALLATION MANUAL

SAFETY PRECAUTIONS

03

ACCESSORIES

07

REFRIGERANT PIPING CONNECTION

08

OUTDOOR UNIT INSTALLATION

12

WIRING

16

SPECIFICATION

21

AIR EVACUATION

22

NOTE ON ADDING REFRIGERANT

23

TEST RUN

24

Read this manual
Inside you’ll find many helpful hints on how to use and maintain your air conditioner properly. Just a little preventive care on your part can save you a great deal of time and money over the life of your air conditioner. These instructions may not cover every possible condition of use, so common sense and attention to safety is required when installing, operating and maintaining this product.

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IOM – Horizontal/Side Discharge Condensing Units
SAFETY PRECAUTIONS
Intended Use
The following safety guidelines are intended to prevent unforeseen risks or damage from unsafe or incorrect operation of the appliance. Please check the packaging and appliance on arrival to make sure everything is intact to ensure safe operation. If you find any damage, please contact the retailer or dealer. Please note modifications or alterations to the appliance are not allowed for your safety. Unintended use may cause hazards and loss of warranty claims.
Explanation of Symbols
WARNING The signal word indicates a hazard with a medium level of risk which, if not avoided, may result in death or serious injury. CAUTION The signal word indicates a hazard with a low degree of risk which, if not avoided, may result in minor or moderate injury. NOTICE The signal word indicates important information (e.g. damage to property), but not danger. Read these operating instructions carefully and attentively before using/commissioning the unit and keep them in the immediate vicinity of the installation site or unit for later use!
WARNING
This appliance is not intended for use by persons(including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance.
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IOM – Horizontal/Side Discharge Condensing Units

WARNINGS FOR PRODUCT USE

· If an abnormal situation arises (like a burning smell), immediately turn off the unit and disconnect the power. Call your dealer for instructions to avoid electric shock, fire or injury.
· Do not insert fingers, rods or other objects into the air inlet or outlet. This may cause injury, since the fan may be rotating at high speeds.
· Do not use flammable sprays such as hair spray, lacquer or paint near the unit. This may cause fire or combustion.
· Do not store gasoline or flammable substances near air conditioner. Emitted gas may collect around the unit and cause explosion.
· Do not Install your air conditioner in a wet room such as a bathroom or laundry room. Too much exposure to water can cause electrical components to short circuit.
· Do not expose your body directly to cool air for a prolonged period of time.

· Do not allow children to play with the air conditioner. Children must be supervised around the unit at all times.

· If the air conditioner is used together with burners or other heating devices, thoroughly ventilate

the room to avoid oxygen deficiency and carbon monoxide build up.

· In certain environments, such as kitchens, server rooms, etc., the use of specially designed

air-conditioning units is highly recommended.

·

Improper installation, adjustment, alteration, service 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, service agency, or the gas supplier.

WARNINGS FOR CLEANING AND MAINTENANCE

· Turn off the device and disconnect the power before cleaning. Failure to do so can cause electrical shock.
· Do not clean the air conditioner with excessive amounts of water.
· Do not clean the air conditioner with combustible cleaning agents. Combustible cleaning agents can cause fire or deformation.

CAUTION
· Turn off the air conditioner and disconnect the power if you are not going to use it for a long time. · Make sure that water condensation can drain unhindered from the unit. · Do not operate the air conditioner with wet hands. This may cause electric shock. · Do not use device for any other purpose than its intended use. · Do not climb onto or place objects on top of the outdoor unit. · 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.

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IOM – Horizontal/Side Discharge Condensing Units
ELECTRICAL WARNINGS
· Do not share the electrical circuit with other appliances. This equipment requires a dedicated electrical circuit.
· The product must be properly grounded at the time of installation, or electrical shock may occur. · For all electrical work, follow all local and national wiring standards, regulations, and the
Installation Manual. Connect cables tightly, and clamp them securely to prevent external forces from damaging the terminal. Improper electrical connections can overheat and cause fire, and may also cause shock. All electrical connections must be made according to the Electrical Connection Diagram located on the panels of the indoor and outdoor units. · All wiring must be properly arranged to ensure that the control board cover can close properly. If the control board cover is not closed properly, it can lead to corrosion and cause the connection points on the terminal to heat up, catch fire, or cause electrical shock.
WARNINGS FOR PRODUCT INSTALLATION
· Installation must be performed by an authorized dealer or specialist. Defective installation can cause water leakage, electrical shock, or fire.
· Installation must be performed according to the installation instructions. Improper installation can cause water leakage, electrical shock, or fire. (In North America,installation must be performed in accordance with the requirement of NEC and CEC by authorized personnel only.)
· Contact an authorized service provider for repair or maintenance of this unit. This appliance shall be installed in accordance with national wiring regulations.
· Only use the included accessories, parts, and specified parts for installation. Using non-standard parts can cause water leakage, electrical shock, fire, and can cause the unit to fail.
· Install the unit in a firm location that can support the unit’s weight. If the chosen location cannot support the unit’s weight, or the installation is not done properly, the unit may fall and cause serious injury and damage.
· Install drainage piping according to the instructions in this manual. Improper drainage may cause water damage to your home and property.
· Do not install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates around the unit, it may cause fire.
· Do not turn on the power until all work has been completed. · When moving or relocating the air conditioner, consult experienced service technicians for
disconnection and reinstallation of the unit. · Unit must be properly supported and secured to prevent tipping of unit. · Excessive Weight Hazard – Use two or more people when moving and installing the unit. Failure
to do so can result in back or other type of injury.
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IOM – Horizontal/Side Discharge Condensing Units
TAKE NOTE OF FUSE SPECIFICATIONS
The air conditioner’s circuit board (PCB) is designed with a fuse to provide overcurrent protection. This fuse must be replaced with an identical component. The specifications of the fuse and printed on the circuit board ,examples of such are T5A/250VAC and T10A/250VAC.
NOTE ABOUT FLUORINATED GASSES (NOT APPLICABLE TO THE UNIT USING R290 REFRIGERANT)
· This air-conditioning unit contains fluorinated greenhouse gasses. For specific information on the type of gas and the amount, please refer to the relevant label on the unit itself or the “Owner’s Manual – Product Fiche ” in the packaging of the outdoor unit. (European Union products only).
· Installation, service, maintenance and repair of this unit must be performed by a certified technician.
· Product uninstallation and recycling must be performed by a certified technician. · When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.
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IOM – Horizontal/Side Discharge Condensing Units
ACCESSORIES

The air conditioning system comes with the following accessories. Use all of the installation parts and accessories to install the air conditioner. Improper installation may result in water leakage, electrical shock and fire, or equipment failure.
Accessories (Packed with the indoor unit)

Name Drain fittingsome models

Shape

Quantity 1

Gasketsome models

1

Flare-to-braze adapter(some models)

2

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IOM – Horizontal/Side Discharge Condensing Units
REFRIGERANT PIPING CONNECTION

Safety Precautions
WARNING
· All field piping must be completed by a licensed technician and must comply with the local and national regulations.
· When the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. If the refrigerant leaks and its concentration exceeds its proper limit, hazards due to lack of oxygen may result.
· When installing the refrigeration system, ensure that air, dust, moisture or foreign substances do not enter the refrigerant circuit. Contamination in the system may cause poor operating capacity, high pressure in the refrigeration cycle, explosion or injury.
· Ventilate the area immediately if there is refrigerant leakage during the installation. Leaked refrigerant gas is both toxic and flammable. Ensure there is no refrigerant leakage after completing the installation work.

Notes on pipe length and elevation

Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and outdoor units meets the requirements shown in the following table:

The Maximum Length And Drop Height Based on Models. (Unit: m/ft.)

CAUTION

Type of model
North America, Australia and the EU frequency conversion Split Type.

Capacity (Btu/h)
<15K
15K – <24K 24K – <36K 36K – 60K

Length of piping
25/82 30/98.4 50/164 65/213

Maximum drop height
10/32.8 20/65.6 25/82 30/98.4

Oil traps If oil flows back into the outdoor unit’s compressor, this might cause liquid compression or deterioration of oil return. Oil traps in the rising gas piping can prevent this. An oil trap should be installed every 6m(20ft) of vertical suction line riser (36000Btu/h unit). An oil trap should be installed every 10m(32.8ft) of vertical suction line riser (36000Btu/h unit).

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IOM – Horizontal/Side Discharge Condensing Units

Name
Connecting pipe assembly

Shape Liquid side
Gas side

6.35(1/4in) 9.52( 3/8in) 12.7( 1/2in) 16( 5/8in) 19( 3/4in) 22( 7/8in)

Quantity(PC)
The correct connecting pipes are included with your equipment.

Air Handler Unit Model

Air Handler Unit Connection(in.flare)

Adapter Required at Air Handler Unit (in.flare to braze)

Outdoor Model

Outdoor Unit Connection (in. flare)

18K/24K

Liquid

3/8

Gas

3/4

3/8flare 3/8braze

Liquid 3/8

18K/24K

3/4flare 3/4braze

Gas

5/8

Liquid

3/8

24K/30K/36K/48K

Gas

3/4

60K

Liquid

3/8

Gas

7/8

3/8flare 3/8braze 24K(Hyper Liquid 3/8 Heat)/30K/

3/4flare 3/4braze 36K/48K

Gas

3/4

3/8flare 7/8flare

3/8braze 7/8braze

60K

Liquid 3/8

Gas

7/8

Adapter Required at Outdoor Unit (in. flare to flare or braze)

3/8flare 5/8flare 5/8flare 3/8flare

3/8braze 3/4flare 3/4braze 3/8braze

3/4flare 3/4braze

3/8flare 3/8braze

7/8flare 7/8braze

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IOM – Horizontal/Side Discharge Condensing Units
Connection Instructions–Refrigerant Piping
CAUTION
· The branching pipe must be installed horizontally. An angle of more than 10° may cause malfunction. · DO NOT install the connecting pipe until both indoor and outdoor units have been installed. · Insulate both the gas and liquid piping to prevent condensation.

Step 1: Cut pipes
When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efficient operation and minimize the need for future maintenance.
Measure the distance between the · indoor and outdoor units.
Using a pipe cutter, cut the pipe a · little longer than the measured
distance. Make sure that the pipe is cut at a · perfect 90° angle.

Step 2: Remove burrs
Burrs can affect the air-tight seal of refrigerant piping connection. They must be completely removed.
· Hold the pipe at a downward angle to prevent burrs from falling into the pipe.
· Using a reamer or deburring tool, remove all burrs from the cut section of the pipe.
Pipe Reamer
Point down

90°

Oblique Rough Warped

DO NOT DEFORM PIPE WHILE CUTTING
Be extra careful not to damage, dent, or deform the pipe while cutting. This will drastically reduce the heating

Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight seal.
· After removing burrs from cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe.
· Sheath the pipe with insulating material. · Place flare nuts on both ends of pipe. Make sure
they are facing in the right direction, because you can’t put them on or change their direction after flaring.
Flare nut
Copper pipe
· Remove PVC tape from ends of pipe when ready to perform flaring work.

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IOM – Horizontal/Side Discharge Condensing Units
· Clamp flare form on the end of the pipe. The end of the pipe must extend beyond the flare form.
Flare form

(Smaller diameter) (Bigger

Pipe
· Place flaring tool onto the form. · Turn the handle of the flaring tool clockwise
until the pipe is fully flared.

PIPING EXTENSION BEYOND FLARE FORM

Pipe gauge

Tightening torque

Flare dimension(A) (Unit:mm/lnch)

Min.

Max.

Flare shape

(180-200kgf.cm)
32-39 N.m (320-390kgf.cm)
49-59 N.m (490-590kgf.cm)
57-71 N.m (570-710kgf.cm)
67-101 N.m (670-1010kgf.cm)
85-110 N.m (850-1100kgf.cm)

· Remove the flaring tool and flare form, then inspect the end of the pipe for cracks and even flaring.
Step 4: Connect pipes
Connect the copper pipes to the indoor unit first, then connect it to the outdoor unit. You should first connect the low-pressure pipe, then the high pressure pipe.
· When connecting the flare nuts, apply a thin coat of refrigeration oil to the flared ends of the pipes.
· Align the center of the two pipes that you will connect.
· Tighten the flare nut snugly by hand. · Using a wrench, grip the nut on the unit tubing. · While firmly gripping the nut, use a torque
wrench to tighten the flare nut according to the torque values in above table.

NOTICE
Use both a spanner and a torque wrench when connecting or disconnecting pipes to/from the unit.

11

Torque wrench
CAUTION
Ensure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite. · Make sure the pipe is properly connected.
Over tightening may damage the bell mouth and under tightening may lead to leakage.
NOTICE MINIMUM BEND RADIUS
Carefully bend the tubing in the middle according to the diagram below. DO NOT bend the tubing more than 90° or more than 3 times. Use care when bending pipe, do not kink pipe.
Use appropriate tool
min-radius 10cm(3.9 ) · After connecting the copper pipes to the
indoor unit, wrap the power cable, signal cable and the piping together with binding tape.
NOTICE
DO NOT intertwine signal cable with other wires. While bundling these items together. DO NOT intertwine or cross the signal cable with any other wiring.

IOM – Horizontal/Side Discharge Condensing Units
OUTDOOR UNIT INSTALLATION

Select the installation location of outdoor units
Before installing the outdoor unit, you must choose an appropriate location. The following are standards that will help you choose an appropriate location for the unit.
Proper installation locations meet the following standards:

60cm(24in) above

4″ from back wall

30cm(12in) on left

60cm(24in) on right

200cm(79in) in front

Front view

Top view

Meets all spatial requirements shown in Installation
Space Requirements above.

Firm and solid–the location can

Noise from the unit will

support the unit and will not vibrate.

not disturb other people.

15cm(6in)

The outdoor unit must be installed on risers of at least
15cm(6in) in height or per local code to get unit above local mean snow fall.

Good air circulation
and ventilation.

DO NOT install unit in the following locations:

Where snowfall is anticipated,
take appropriate measures to prevent ice buildup and coil damage.

Near an obstacle that will block air inlets and outlets.
In a location that is exposed to large amounts of dust.

Near animals or plants that will be harmed by hot air discharge. Near any source of combustible gas

Near a public street, crowded areas, or where noise from the unit will disturb others.

CAUTION:

SPECIAL CONSIDERATIONS FOR EXTREME WEATHER

If the unit is exposed to heavy wind:

Install unit so that air outlet fan is at a 90° angle to the direction of the wind. If needed, build a barrier

in front of the unit to protect it from extremely heavy winds. See Figures below.

If the unit is frequently exposed to heavy rain or snow:

Build a shelter above the unit to protect it from the rain or snow. Be careful not to obstruct air flow

around the unit.

Strong wind

Wind Baffle

Shelter

Strong wind
90° angle to the direction of the wind

Strong wind
Build a wind Baffle to protect the unit

Build a shelter to protect the unit

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IOM – Horizontal/Side Discharge Condensing Units
Install drain fitting(Heat pump unit only)

Step 1
Find out the base pan hole of outdoor unit.
Seal

Base pan hole of outdoor unit

Step 2
Fit the rubber seal on the end of the drain fitting that will connect to the outdoor unit.
Insert the drain fitting into the hole in the base pan of the unit. The drain fitting will click in place.
Connect a drain hose extension (not included) to the drain fitting to redirect water from the unit during heating mode.
IN COLD CLIMATES
In cold climates, make sure that the drain hose is as vertical as possible to ensure swift water drainage. If water drains too slowly, it can freeze in the hose and flood the unit.
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IOM – Horizontal/Side Discharge Condensing Units
Anchor outdoor unit
The outdoor unit can be anchored to the ground or to a wall-mounted bracket with bolt(M10). Prepare the installation base of the unit according to the dimensions below.
Outdoor Unit Types and Specifications

D B

H
A H

W

W

Front view

Top view

Outdoor Unit Dimensions

W

H

mm

inch

mm

inch

mm

805

31-11/16

554

21-13/16

330

890

35

673

26-1/2

342

946

37-1/4

810

31-29/32

410

952

37-1/2

1333

52-1/2

415

980

38-19/32

975

38-13/32 410

D
inch 13
13-15/32 16-5/32 16-11/32 16-5/32

Mounting Dimensions

A

B

mm

inch

mm

511

20-1/8

317

inch 12-1/2

663

26-1/8

354

13-15/16

673

26-1/2

403

15-7/8

634

24-35/36

404

15-29/32

616

24-1/4

397

15-5/8

(unit: mm/inch)

o2r5mcomre/

9.8″25 or

mcmor/e

9.8″

H

L

A

150

ocmr m/o5r9e”60

cm or

m/ 2o3re.6″

300

cm

/

118″

or more
Rows of series installation
The relations between H, A and L

are

as

follows.

L H

L
L 1/2H

A
25 cm / 9-13/16in or more

1/2H < L H

30 cm / 11-13/16in or more

L > H

Can not be installed

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IOM – Horizontal/Side Discharge Condensing Units
If you will install the unit on the ground or on a concrete mounting platform,
DO THE FOLLOWING:
Mark the positions for four expansion bolts based on dimensions chart.
Pre-drill holes for expansion bolts. Place a nut on the end of each expansion bolt. Hammer expansion bolts into the pre-drilled
holes. Remove the nuts from expansion bolts, and
place outdoor unit on bolts. Put washer on each expansion bolt, then
replace the nuts. Using a wrench, tighten each nut until snug.
WARNING
WHEN DRILLING INTO CONCRETE, EYE PROTECTION IS RECOMMENDED AT ALL TIMES.

If you will install the unit on a wall-mounted bracket,
DO THE FOLLOWING:
Mark the position of bracket holes based on dimensions chart.
Pre-drill the holes for the expansion bolts. Place a washer and nut on the end of each
expansion bolt. Thread expansion bolts through holes in
mounting brackets, put mounting brackets in position, and hammer expansion bolts into the wall. Check that the mounting brackets are level. Carefully lift unit and place its mounting feet on brackets. Bolt the unit firmly to the brackets. If allowed, install the unit with rubber isolator pads o reduce vibrations and noise.
CAUTION
Make sure that the wall is made of solid brick, concrete, or of similarly strong material. The wall must be able to support at least four times the weight of the unit.

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IOM – Horizontal/Side Discharge Condensing Units
WIRING PRECAUTIONS
WARNING
BEFORE PERFORMING ANY ELECTRICAL WORK, READ THESE WARNINGS.

All wiring must comply with local and national electrical codes, regulations and must be installed by a licensed electrician.
All electrical connections must be made according to the Electrical Connection Diagram located on the panels of the indoor and outdoor units.
If there is a serious safety issue with the power supply, stop work immediately. Explain your reasoning to the client, and refuse to install the unit until the safety issue is properly resolved.
Power voltage should be within 90-110% of rated voltage. Insufficient power supply can cause malfunction, electrical shock, or fire.
Installation of an external surge suppressor at the outdoor disconnect is recommended.
Power must be connected, a switch or circult breaker that disconnects all poles and has a contact separation of at least 1/8in (3mm) must be incorporated in the fixed wiring. The qualified technician must use an approved circuit breaker or switch.
Only connect the unit to an individual branch circuit. Do not connect another appliance to that circuit.
Make sure to properly ground the air conditioner. Every wire must be firmly connected. Loose
wiring can cause the terminal to overheat, resulting in product malfunction and possible fire.

Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within the unit.
To avoid getting an electric shock, never touch the electrical components soon after the power supply has been turned off. After turning off the power, always wait 10 minutes or more before you touch the electrical components.
Make sure that you do not cross your electrical wiring with your signal wiring. This may cause distortion, interference or
possibly damage to circuit boards. Connect the outdoor wires before
connecting the indoor wires.
WARNING
BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER TO THE SYSTEM.

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IOM – Horizontal/Side Discharge Condensing Units
OUTDOOR UNIT WIRING
WARNING
Before performing any electrical or wiring work, turn off the main power to the system.

Step 1: Prepare the cable for connection.
1. You must first choose the right cable size. 2. Using wire strippers, strip the jacket from
both ends of the signal cable to reveal approximately 15cm (5.9″) of wire. 3. Strip the insulation from the ends. 4. Stranded wire requires u-lugs or ring terminals to be crimped onto the ends of the wire.
NOTICE
When connecting the wires, strictly follow the wiring diagram found inside the electrical box cover.
Choose the cable type according to the local electrical switchs and regulations.
Please choose the right cable size according to the Minimum Circuit Ampacity indicated on the nameplateof the unit.
Step 2: Remove the electric cover.
Remove the electric cover of the outdoor unit.
Cover

L1 L2

OPTIONAL

CLASS 2 B W D R C Y1 Y2 L

Outdoor Unit B

TO POWER SOURCE

4. Clamp down the cable with the cable clamp.
5. Insulate unused wires with electrical tape. Keep them away from any electrical or metal parts.

6. Reinstall the cover of the electric control box.

In North America

1. Remove the wire cover from the unit by loosening the 3 screws.
2. Remove caps on the conduit panel. 3. Mount the conduit tubes(not included) on the
caonduit panel. 4. Properly connect both the power supply and
low voltage lines to the corresponding terminals on the terminal block. 5. Ground the unit in accordance with local codes. 6. Be sure to size each wire allowing several inches longer than the required length for wiring.

Screw

Step 3: Connect the u-lugs to the terminals

Match the wire colors/labels with the labels on the terminal block. Firmly screw the u-lug of each wire to its corresponding terminal.

CLASS 2 B W D
R C Y1 Y2 L

L1 L2

Outdoor Unit A

TO POWER SOURCE

Terminal block
(O40vmerm1-)9/16″

Connecting cable
G
Power supply cord
Conduit panel

Wire Cover
Please select the appropriate through-hole according to the diameter of the wire.

WARNING
ISOLATE THE POWER SUPPLY LEADS AND
COMMUNICATION LEADS BY THE STRAIN RELIEF AND KEEP POWER SUPPLY LEADS AWAY FROM COMMUNICATION LEADS. DISCONNECTION MUST BE INCORPORATED IN THE FIXED WIRING IN ACCORDANCE WITH THE WIRING RULES.

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IOM – Horizontal/Side Discharge Condensing Units
SPECIFIC WIRING METHODS
WARNING
Please refer to the wiring nameplate for the wiring method. Do not connect 24V AC to S1 – S2, as this will damage the system.

Connection method A:
This is the preferred method of control with the communicating control, for the indoor and outdoor unit. Refer to the wiring method of internal and external machine communication and wired controller as follows:
Connection method B:
To use a 24V thermostat, you need to refer to the following wiring:

24V communication

Cooling Only Outdoor Unit Only Mode
S1 S2 R C Y1 Y2 L
CN6 TO 24V THERMOSTAT

S1 ON
1 23 4

Other Outdoor Unit Only Mode
S1 S2 B W D R C Y1 Y2 L
CN6 TO 24V THERMOSTAT

24V must never be connected to S1 ­ S2. All wiring must be in compliance with the above scenarios. Incorrect wiring will cause irreversible damage to control.
24V connection Dip Switch setting as shown in the picture:

Cooling Only

Other

S1-2 dip switch to be “ON”

When using a 24V thermostat, please refer to the non-communicating wiring diagrams that follow:
Connection method C:
NOTICE
This equipment uses B functionality. This terminal is energized for heating functionality. Please ensure that thermostat configuration is set up for B functionality. Note: These methods are for use with a Comfort-Aire outdoor unit and a third party indoor unit or cased coil and gas furnace.
18

NOTICE
The use of shielded communication or thermostat wire is not required, but is recommended where separation from high voltage conductors can not be maintained, or in areas with high electrical noise. The shield and drain conductor must be grounded at the outdoor unit and stripped back and taped at the indoor unit. Grounding at both ends results in an increase of noise transmitted onto the signal wires.

IOM – Horizontal/Side Discharge Condensing Units
Outdoor unit DIP Switch setting Press the SW1 button 10S for force defrosting

SW1

S1

NO. Dial code

Features

ON

OFF

1 S1-1 2 S1-2
3 S1-3

Function to be defined

Communication dial code 24V communication scheme 485 communication scheme

Strong cold and strong heat function

The cooling/heating target The cooling/heating target

pressure compensation value pressure compensation value

is valid

is invalid

4 S1-4

Enhanced defrosting function

Enhanced defrosting

Default setting(standard defrost algorithm)

SPECIFIC WIRING METHODS
NOTICE
The following wiring diagram are suitable for the AHU and ODU with 24V thermostat.

Non-communication scheme wiring reference

· Wiring for 4H and 2C thermostat

· Wiring for 3H and 2C thermostat

W2 W1/E O/B
Y2 Y1 G L C R DH
THERMOSTAT

DH R C L G Y1

B W W1 W2 E

INDOOR UNIT

S4-1 Default on DH function off. Turn switch off to activate DH function.

R C Y1 Y2 B W D L OUTDOOR UNIT

W1/E O/B Y2 Y1
G L C R DH
THERMOSTAT

S4-2 Default on, W1 and W2 shorted for single stage Aux heat operation. Turn off to separate stages.

DH R C L G Y1

B W W1 W2 E

INDOOR UNIT

S4-1 Default on DH function off. Turn switch off to activate DH function.

R C Y1 Y2 B W D L
S4-2 Default on, W1 and W2 shorted for single stage Aux heat operation. Turn off to separate stages.

· Wiring for 3H and 1C thermostat

· Wiring for 2H and 2C thermostat

W2 W1/E O/B
Y G L C R DH
THERMOSTAT

O/B Y2 Y1 G C R
THERMOSTAT

DH R C L G Y1

B W W1 W2 E

R C Y1 Y2 B W D L

INDOOR UNIT

OUTDOOR UNIT

S4-1 Default on DH function off. Turn switch off to activate DH function.

S4-2 Default on, W1 and W2 shorted for single stage Aux heat operation. Turn off to separate stages.

19

DH R C L G Y1

B W W1 W2 E

INDOOR UNIT

R C Y1 Y2 B W D L OUTDOOR UNIT

IOM – Horizontal/Side Discharge Condensing Units

· Wiring for 3H and 2C thermostat

E O/B Y2 Y1
G L C R DH
THERMOSTAT

DH R C L G Y1

B W W1 W2 E

R C Y1 Y2 B W D L

INDOOR UNIT

OUTDOOR UNIT

S4-1 Default on DH function off. Emergency heating control two groups

Turn switch off to activate DH

of electric heating at the same time

function.

· Wiring for 2H and 1C thermostat

W/E O/B
Y G C R

THERMOSTAT

DH R C L G Y1

B W W1 W2 E

INDOOR UNIT

R C Y1 Y2 B W D L OUTDOOR UNIT

S4-2 Default on, W1 and W2 shorted for single stage Aux heat operation. Turn off to separate stages.
· Wiring for 1H and 1C thermostat

O/B Y G C R
THERMOSTAT

DH R C L G Y1

B W W1 W2 E

INDOOR UNIT

R C Y1 Y2 B W D L OUTDOOR UNIT

Control logic

Indoor unit connector

Connector
R C Y1 Y2 B W D L

Purpose
24V power Connection Common Low Cooling Heat Cooling Heating Reversing Valve Heating control Defrost control System Fault Signal

LED display
The control displays unit status as well as any active fault codes on the LED display. If the unit is functioning normally, the LED will display current temperature setpoint. When a fault code is active, the display will flash the active fault code. Please refer to the fault code table located in the troubleshooting section of the Service Manual for detailed fault code information.

· Wiring for 1H and 1C thermostat

NOTICE
This is the least preferred method of control wiring and should only be used for emergency situations. Full comfort capacity may not be achieved using this method.
20

IOM – Horizontal/Side Discharge Condensing Units

POWER SPECIFICATIONS

Cooling and Heating power specifications

POWER (outdoor)
INPUT CIRCUIT FUSE
OUTDOOR UNIT POWER LINE
OUTDOOR-INDOOR SIGNAL LINE THERMOSTAT SIGNAL LINE

PHASE FREQUENCY AND VOLT

OUTDOOR UNIT(A) LINE QUANTITY

MCA MOP

LINE DIAMETER(AWG)

LINE QUANTITY LINE DIAMETER(AWG) LINE QUANTITY LINE DIAMETER(AWG)

18K

24K

Std Hyper HT 16 / 16 20 / 20
STD 12 HH 12

Std Hyper HT 19 / 20 30 / 35 2+Ground
STD 12 HH 12

30K
Std Hyper HT 20 / 23 35 / 35
STD 12 HH 10

POWER (outdoor)
INPUT CIRCUIT FUSE
OUTDOOR UNIT POWER LINE
OUTDOOR-INDOOR SIGNAL LINE THERMOSTAT SIGNAL LINE

PHASE FREQUENCY AND VOLT

OUTDOOR UNIT(A) LINE QUANTITY

MCA MOP

LINE DIAMETER(AWG)

LINE QUANTITY LINE DIAMETER(AWG) LINE QUANTITY LINE DIAMETER(AWG)

36K

36K(X6) 48K

60K

Std Hyper HT 24 / 41 40 / 50
STD 10 HH 8

Hyper HT 30 35

Std Hyper HT Std Hyper HT

34 / 42

34 / NA

50 / 50

60 / NA

2+Ground

HH 10

STD 8 HH 6

STD 8 HH NA

Cooling Only power specifications

POWER (outdoor)
INPUT CIRCUIT FUSE
OUTDOOR UNIT POWER LINE
OUTDOOR-INDOOR SIGNAL LINE THERMOSTAT SIGNAL LINE

PHASE FREQUENCY AND VOLT
OUTDOOR UNIT(A) MCA MOP
LINE QUANTITY
LINE DIAMETER(AWG)
LINE QUANTITY LINE DIAMETER(AWG) LINE QUANTITY LINE DIAMETER(AWG)

18K
CO 15 20
CO 12

24K
CO 20 30
CO 12

30K

36K 48K

CO 29 45
2+Ground
CO 12

CO 29 45
CO 12

CO 32 50
CO 10

NOTICE
Line Diameter Sizing per NFPA 70 (2020), Table 310.15 (B) (16) Based on type NM-B Romex wire. Other sizing options are possible. Consult NFPA 70 or Licensed Electrician for alternate sizing. Please follow the prompts on the nameplate of the machine body for actual parameters.

21

IOM – Horizontal/Side Discharge Condensing Units

AIR EVACUATION

NOTICE
When opening valve stems, turn the hexagonal wrench until it hits against the stopper. Do not try to force the valve to open further. Open valves slowly until your hear refrigerant, allow pressure to equalize before opening fully. Open large vapor line valve first.

Preparations and precautions
Air and foreign matter in the refrigerant circuit can cause abnormal rises in pressure, which can damage the air conditioner, reduce its efficiency, and cause injury. Use a vacuum pump and manifold gauge to evacuate the refrigerant circuit, removing any non-condensable gas and moisture from the system. Evacuation should be performed upon initial installation and when unit is relocated.
Evacuation Instructions
1. Connect the charge hose of the manifold gauge to service port on the outdoor unit’s low pressure valve.
2. Connect another charge hose from the manifold gauge to the vacuum pump.
3. Open the Low Pressure side of the manifold gauge. Keep the High Pressure side closed.
4. Tighten refrigerant valve caps hand tight to ensure there are no vacuum leaks.
5. Turn on the vacuum pump to evacuate the system.

6. Run the vacuum for at least 15 minutes, or until the Compound Meter reads -76cmHG(-105Pa) or 500 microns.
7. Close the Low Pressure side of the manifold gauge, and turn off the vacuum pump.
8. Wait for 5 minutes, then check that there has been no change in system pressure.
9. If there is a change in system pressure, refer to Gas Leak Check section for information on how to check for leaks. If there is no change in system pressure, unscrew the cap from the packed valve (high pressure valve).
10.Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning the wrench in a 1/4 counterclockwise turn. Listen for gas to exit the system, then close the valve after 5 seconds.
11. Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. The Pressure Gauge should read slightly higher than atmospheric pressure.
12. Remove the charge hose from the service port.
Flare nut
Cap

Outdoor unit

valve body

valve stem

Manifold Gauge
-76cmHg

Compound gauge

Pressure gauge

Low pressure
valve Pressure hose
or Charge hose

High pressure valve Charge hose

Low pressure valve

Vacuum pump

13. Using hexagonal wrench, fully open both the
high pressure and low pressure valves. 14. Tighten all valve caps with a wrench to
ensure no leaks. You may tighten it further
using a torque wrench if needed.

22

IOM – Horizontal/Side Discharge Condensing Units
NOTE ON ADDING REFRIGERANT
CAUTION
DO NOT mix refrigerant types.
Some systems require additional charging depending on pipe lengths. The standard pipe length varies according to local regulations. For example, in North America, the standard pipe length is 7.5m (25′). In other areas, the standard pipe length is 5m (16`). The refrigerant should be charged from the service port on the outdoor unit’s low pressure valve. The additional refrigerant to be charged can be calculated using the following formula:
23

TEST RUN

IOM – Horizontal/Side Discharge Condensing Units

CAUTION
Failure to perform the test run may result in unit damage, property damage, or personal injury.

Before test run
A test run must be performed after the entire system has been completely installed. Confirm the following points before performing the test: a) Indoor and outdoor units are properly installed. b) Piping and wiring are properly connected. c) No obstacles near the inlet and outlet of the unit that might cause poor performance or product malfunction. d) Refrigeration system does not leak. e) Drainage system is unimpeded and draining to a safe location. f) Heating insulation is properly installed. g) Grounding wires are properly connected. h) Length of the piping and additional refrigerant capacity have been recorded. i) Power voltage is the correct voltage for the air conditioner
Test run Instructions
1. Open both the liquid and gas service valves. 2. Turn on the main power switch and allow the
unit to warm up. 3. Set the air conditioner to COOL mode. 4. For the Indoor Unit
a.Double check to see if the room temperature is being registered correctly.
b.Check to see that the drainage system is unimpeded and draining smoothly.
c.Ensure there is no vibration or abnormal noise during operation.

5. For the Outdoor Unit a. Check to see if the refrigeration system is leaking. b. Make sure there is no vibration or abnormal noise during operation. c. Ensure the wind, noise, and water generated by the unit do not disturb your neighbors or pose a safety hazard.
6. Drainage Test a. Ensure the drainpipe flows smoothly. New buildings should perform this test before finishing the ceiling. b. Turn on the main power switch and run the air conditioner in COOL mode. c. Check to see that the water is discharged. It may take up to one minute before the unit begins to drain depending on the drainpipe. d. Make sure that there are no leaks in any of the piping. e. Stop the air conditioner. Turn off the main power switch and reinstall the test cover.
NOTICE
If the unit malfunctions or does not operate according to your expectations, please refer to the Troubleshooting section of Service Manual before calling customer service.

The design and specifications are subject to change without prior notice for product improvement. Consult with the sales agency or manufacturer for details. Any updates to the manual will be uploaded to the service website, please check for the latest version.
24

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Page Intentionally Left Blank

LIMITED EXPRESS WARRANTY `CMA’ SERIES HORIZONTAL/SIDE DISCHARGE CONDENSERS

Congratulations on purchasing your new HVAC equipment. It’s been designed for long life and reliable service, and is backed by one of the strongest warranties in the industry. Your unit automatically qualifies for the warranty coverage listed below, providing you keep your proof of purchase (receipt) for the equipment and meet the warranty conditions.

DURATION OF WARRANTY & REGISTRATION
The warranty begins on the date of purchase by the original consumer. The consumer must retain a receipted bill of sale as proof of warranty period. Without this proof, the express warranty begins on the date of shipment from the factory.

LIMITED FIVE (5) YEAR PARTS EXPRESS WARRANTY

REMEDY PROVIDED BY THE LIMITED EXPRESS WARRANTY

MARS/Heat Controller warrants all parts of the `CMA’ Series

The sole remedy under the Limited Warranty is replacement of the defective

Condensing Unit to be free from defects in workmanship and materials

part. If replacement parts are required within the period of this warranty,

normal use and maintenance for five (5) year from the date of purchase

MARS/Heat Controller replacement parts shall be used; any warranty

by the original consumer. This Express Limited Warranty applies only

on the replacement part(s) shall not affect the applicable original unit

when the `CMA’ Series Condensing Unit is installed and operated

warranty. Ready access to the unit for service is the owner’s responsibility.

per MARS/Heat Controller installation and operating instructions for

Labor to diagnose and replace the defective part is not covered by this

normal use, and in accordance with all local, state and national codes.

Limited Express Warranty. If for any reason the replacement part/product

is no longer available during the warranty period, MARS/Heat Controller

LIMITED SEVEN (7) YEAR COMPRESSOR EXPRESS WARRANTY

shall have the right to allow a credit in the amount of the current suggested

The compressor only is warranted to be free from defects in

retail price of the part/product instead of providing repair or replacement.

workmanship and materials under normal use and maintenance for

a total of seven (7) years from the date of purchase by the original

LIMITATION OF LIABILITY

consumer. This seven year warranty applies only when the system is installed and operated per MARS/Heat Controller installation and operation instructions for normal use.

1. There are no other express or implied warranties. MARS/Heat Controller makes no warranty of merchantability. We do not warrant that the unit is suitable for any particular purpose or can be used

COMMERCIAL USE­LIMITED TWO (2) YEAR PARTS WARRANTY
When the unit is put to commercial, business, rental, or any application other than residential use, the Two Year Parts Limited Warranty as described in paragraph one is the only warranty that applies.

in buildings or rooms of any particular size or condition except as specifically provided in this document. There are no other warranties, express or implied, which extend beyond the description in this document.
2. All warranties implied by law are limited in duration to the one-

EXCEPTIONS The Limited Express Warranty does not cover normal maintenance– MARS/Heat Controller recommends that regular inspection/ maintenance be performed at least once a season and proof of

year term of the parts warranty. Your exclusive remedy is limited to the replacement of defective parts. We will not be liable for any consequential or incidental damages caused by any defect in this
unit.

maintenance be kept. Additionally, labor charges, transportation

3. This warranty gives you specific legal rights and you may also have

charges for replacement parts, replacement of refrigerant or filters,

other rights which vary from state to state. Some states do not allow

any other service calls/repairs are not covered by this Limited

limitation on how long an implied warranty lasts or do not allow the

Warranty. It also does not cover any portion or component of the

exclusion or limitation of incidental or consequential damages, so the

system that is not supplied by MARS/Heat Controller, regardless of

above limitations or exclusions may not apply to you.

the cause of failure of such portion or component.

4. No warranties are made for units sold outside the continental United

CONDITIONS FOR WARRANTY COVERAGE · Unit must be operated according to MARS/Heat Controller operating

States and Canada. Your distributor or final seller may provide a warranty on units sold outside these areas.

instructions included with the unit and cannot have been subjected

5. MARS/Heat Controller will not be liable for damages if our performance

to accident, alteration, improper repair, neglect or misuse, or an act

regarding warranty resolution is delayed by events beyond our control

of God (such as a flood)

including accident, alteration, abuse, war, government restrictions,

· Installation was done by a trained, licensed or otherwise qualified

strikes, fire, flood, or other acts of God.

HVAC dealer/contractor

· Performance cannot be impaired by use of any product not authorized by MARS/Heat Controller, or by any adjustments or adaptations to components

HOW TO OBTAIN WARRANTY SERVICE OR PARTS
If you have a warranty claim, notify your installer promptly. If the installer does not remedy your claim, write to MARS, 1900 Wellworth Ave., Jackson MI 49203. Enclose a report of inspection by your installer or service person.

· Serial numbers and/or rating plate have not been altered or

Include model number, serial number, and date of purchase.

removed · Damage has not been a result of inadequate wiring or voltage

Owner responsibilities are set forth in the instruction manual–read it carefully.

conditions, use during brown-out conditions, or circuit

interruptions

KEEP THIS INFORMATION AS A RECORD OF YOUR PURCHASE

· Air flow around any section of the unit has not been restricted

`CMA’ SERIES HORIZONTAL/SIDE DISCHARGE CONDENSING UNIT

· Unit remains in the original installation · Unit was not purchased over the internet

Model Number

Model Number

Installer Name

Serial Number

Serial Number

Phone No./Contact Info

CMA15_WARRANTY_5/2024

Date of Purchase

Date Installation Completed

Remember to retain your bill of sale as proof of warranty period.

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