Samsung MXD-U000XN User manual

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
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
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
2
1.5 1.5 Less
2 2 As published (AHRI)
2.5 2 More
3
2.5 2.5 Less
3 3 As published (AHRI)
3.5 3 More
4
3.5 3.5 Less
4 4 As published (AHRI)
4.5 4 More
5
4.5 4.5 Less
5 5 As published (AHRI)
5.5 5 More
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Before Installation
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
1
2
3
4
No. Parts and components
1 Front cover (Case-top)
2PCB
3 Rear cover (Case-bottom)
4 Magnet
Installation
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Installation
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
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.
A
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Installation
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
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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F1
F2
Y1
Y2
Insert the wires this way Wire
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