Samsung MXD-U000XN Manuel utilisateur

AHU Control Unit (ACU)

Installation manual

MXD-U000XN

• Before operating this unit, please read this manual carefully and retain it for future reference.

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ContentsContents

Safety Information 3

Before Installation 6

Functions of the AHU Control Unit (ACU) 6

Structure Diagram of the AHU Control Unit (ACU) 6

Installation 7

Accessories 7

External appearance 7

External dimensions 8

Circuit diagram 8

Installation 9

Wiring Diagram 13

Option settings 25

Appendix 31

Troubleshooting 31

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Safety Information

California Proposition 65 Warning (US)

WARNING :

Cancer and Reproductive Harm -

www.P65Warnings.ca.gov.

This installation manual explains how to install a AHU Control

Unit (ACU) connected to your system air conditioner. Please

read this manual thoroughly before installing the product.

(Please refer to appropriate installation for any optional product

installation.)

WARNING

• Hazards or unsafe practices that may result in severe

personal injury or death.

CAUTION

• Hazards or unsafe practices that may result in minor

personal injury or property damage.

WARNING

Turn off the powerbefore installation, service, and cleaning.

Contact a service centre for installation.

• Potential risk of malfunction, waterleak, electric shock and fire.

Install the product on a hard and even place that can support

its weight.

• If the place cannot support its weight, the product may

fall down and it may cause product damage.

Install the product with proper power supply.

• Potential risk of fire or product damage.

Do not move orreinstall the product on yourdiscretion.

• Potential risk of electric shock or fire.

Consult the place of purchase ora contact centre to

disassemble or repairthe product.

• Potential risk of malfunction, electric shock, or fire.

Check if the installation work is done correctly according to

the installation manual.

• Incorrect installation may cause electric shock or fire.

The electric work must be done by qualified person according

to national wiring regulations and installation guide.

• If an unauthorized person performs the installation, any resulting

defects can cause malfunctions, electrical shocks, or fire accidents.

When you want to dispose yourAHU Control Unit (ACU), ask

the service centre.

CAUTION

Do not install the product where there’s combustible gas.

• Potential risk of fire and explosion.

Do not install the product in areas exposed to oil orvapor.

• Potential risk of product damage or malfunction.

Ensure nowater gets into theAHU Control Unit (ACU).

• Potential risk of electric shock or fire.

Do not put undue stress on the powercable.

• Potential risk of broken cable and fire.

Do not install the product in areas with frequent use of acid

or alkali spray.

• Potential risk of electric shock or product malfunction.

Do not handle the product with sharp objects.

• Potential risk of electric shock or product damage.

Do not connect power cable to a communication terminal.

• Potential risk of fire.

Be cautious not to interfere any other electrical devices if the

product is installed in a place such as hospital.

• Potential risk of product malfunction.

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Safety Information

Section 15.105 Information to the user.

(a) For a Class A digital device or peripheral, the instructions furnished the user shall include the following or similar

statement, placed in a prominent location in the text of the manual:

NOTE: This equipment has been tested and found to complywith the limits for a Class A digital device, pursuant to Part 15 of

the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment

is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if

not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference in which case the userwill be

required to correct the interference at his own expense.

(b) For a Class B digital device or peripheral, the instructions furnished the user shall include the following or similar

statement, placed in a prominent location in the text of the manual:

NOTE: This equipment has been tested and found to complywith the limits for a Class B digital device, pursuant to Part 15

of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential

installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in

accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee

that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or

television reception,

Section 15.21 Information to user

The users manual or instruction manual for an intentional or unintentional radiator shall caution the user that changes or

modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the

equipment. In cases where the manual is provided only in a form other than paper, such as on a computer disk or over the

Internet, the information required by this section may be included in the manual in that alternative form, provided the user

can reasonably be expected to have the capability to access information in that from.

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Safety Information

Samsung gives notice of the following legal disclaimer.

Information on performance regarding the Basic Model Group(BMG) can be obtained from AHRI (Air-Conditioning, Heating, and

Refrigeration Institute). Performance registered in ICM (Independent Coil Manufacturers) can be guaranteed fully by members of

ICM. Partial system changes or performance changes are not provided by SAMSUNG or members of ICM. Referto the table below for

information regarding compatibility.

Allowable indoor unit coil volume

Capacity (tons) Minimum Coil Volume [in³(l)] Maximum Coil Volume [in³(l)]

2 91.54(1.5) 213.58(3.5)

3 122.05(2.0) 244.09(4.0)

3 152.56(2.5) 335.63(5.5)

4 152.56(2.5) 335.63(5.5)

5 183.07(3.0) 366.14(6.0)

Allowable indoor unit connections

Outdoor Unit

Capacities (ton)

Allowed IndoorUnit Connections

(ton) Performance (ton) Efficiency

1.5 1.5 Less

2 2 As published (AHRI)

2.5 2 More

2.5 2.5 Less

3 3 As published (AHRI)

3.5 3 More

3.5 3.5 Less

4 4 As published (AHRI)

4.5 4 More

4.5 4.5 Less

5 5 As published (AHRI)

5.5 5 More

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Before Installation

Functions of the AHU Control Unit (ACU)

• The AHU Control Unit (ACU) controls the system based on input signals from a 24VAC thermostat.

• The AHU Control Unit (ACU) provides 24 VAC output signals for the thermostat to the third-party indoor unit. See page

8 for the circuit diagram for the AHU Control Unit (ACU).

Structure Diagram of the AHU Control Unit (ACU)

Outdoor Unit

24 VAC Thermostat (field supplied)

AHU Control Unit

Third-party Indoor Unit

(AHU, Furnace + A-coil etc.)

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Installation

Accessories

AHU Control Unit (ACU) Cable tie (2)

M4x16 screw (4) U-ring (20)

Fan speed control wire (1) Holder lock (4)

Installation manual (1) Wire label (1)

External appearance

No. Parts and components

1 Front cover (Case-top)

2PCB

3 Rear cover (Case-bottom)

4 Magnet

Installation

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Installation

External dimensions

[Unit: inch (mm)]

8.81 (223.8)

1.87 (47.5)

6.84 (173.8)

Circuit diagram

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AHU Control Unit (ACU)

INDOOR FAN 3 STEP

INDOOR FAN 2 STEP

INDOOR FAN1 STEP

COMPRESSOR STAGE 1

OUTDOOR

COMMUNICATION

AC POWER

24Vac

COMPRESSOR STAGE 2

FAN

AUX HEATER STAGE 1

4WAY VALVE

COMPRESSOR STAGE 1

COMPRESSOR STAGE 2

FAN

AUX HEATER STAGE 1

AUX HEATER STAGE 2

Dehumidification

THERMOSTAT AHU/INDOOR

AUX HEATER STAGE 2

Dehumidification

4WAY VALVE

FAN SPEED CONTROL

Reset

Reserved

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Installation

CAUTION

• The AHU Control Unit (ACU) should be installed by a qualified person, according to the relevant local wiring regulations

and this installation manual.

• Turn off the power before connecting the terminals.

• Install wires according to the relevant electrical wiring regulations. Ensure that the wires are installed inside the indoor

unit or on a wall near the indoor unit, to prevent access by users.

• Do not install the AHU Control Unit (ACU) outdoors.

• Do not install the AHU Control Unit (ACU) in a location with direct sunlight or a location with a risk that the AHU

Control Unit (ACU) may come into contact with liquid or may be impacted.

• Close the AHU Control Unit (ACU) securely.

1 Push the middle area of the AHU Control Unit (ACU) to separate the front cover, as shown in the figure.

2 Before affixing the AHU Control Unit (ACU), remove area A on the rear cover as shown in the figure below. Insert wires into

this opening.

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Installation

3 The magnets attached to the rear cover can be used to fix the device to the indoor unit. If the device cannot be fixed properly

with the magnets, use the supplied screws to fix to the unit or a nearby structure.

• Before attaching the rear cover, ensure there are gaps of at least 3/8" along the top and the left and right sides of

the device and a gap of at least 2" along the bottom.

3/8" or more

Magnet (at 4 spots)

3/8" or more

Screw hole (at 4 spots)

2" or more

4 Insert the wires into the device by passing them through the opening created in step 2.

5 Use the supplied labels to label the wires before connecting to the corresponding terminals.

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Insert the wires this way Wire

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