Climma MV8 User manual

Installation, operation
and maintenance
manual
FAN COIL
CONTROL MV8
Rev. 210525

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Installation manual MV8 –Page 2 / 17
Table of contents
1. Introduction........................................................................................................................................................................................ 4
1.1. General information .............................................................................................................................................................. 4
1.2. Product features .....................................................................................................................................................................4
1.3. Directives ................................................................................................................................................................................... 4
1.4. Installation................................................................................................................................................................................. 4
1.5. Transport and handling ....................................................................................................................................................... 4
1.6. Unpacking ................................................................................................................................................................................. 4
1.7. General safety.......................................................................................................................................................................... 5
2. INSTALLATION...................................................................................................................................................................................6
2.1. Climma MV8 control technical features........................................................................................................................6
2.2. Positioning of the MV8 control ........................................................................................................................................ 7
2.3. Fixing the MV8 control......................................................................................................................................................... 7
3. SETTING THE MV8 CONTROL...................................................................................................................................................... 8
3.1.1. DIP switch setting.............................................................................................................................................................. 8
3.1.2. MV8 configuration for the C-Touch control panel..............................................................................................9
4. ELECTRICAL CONNECTION.........................................................................................................................................................10
4.1.1. Sicurezza.............................................................................................................................................................................10
4.1.2. Electrical supply ...............................................................................................................................................................10
4.1.3. Connection schematic...................................................................................................................................................11
4.1.4. Fresh water temperature probe CO.........................................................................................................................12
4.1.5. Probe CO on Fan coil –Fan only configuration..................................................................................................12
4.1.6. Probe CO on Fan coil –Water valve configuration ...........................................................................................12
4.1.7. Multiple MV8 controls with a single digital control panel .............................................................................12
4.1.8. Modbus communication..............................................................................................................................................13
5. Operation...........................................................................................................................................................................................14
5.1. Control panel identification .............................................................................................................................................14
6. Maintenance.....................................................................................................................................................................................15
7. TROUBLESHOOTING.....................................................................................................................................................................16
7.1. The digital panel shows n.Pr ...........................................................................................................................................16
7.2. The digital panel shows Err.............................................................................................................................................16
7.3. Product identification .........................................................................................................................................................16
7.4. Fuses..........................................................................................................................................................................................16
7.5. Supply check ..........................................................................................................................................................................16
7.6. The fan doesn’t work ..........................................................................................................................................................16
7.7. Erratic fan speed control ...................................................................................................................................................16
8. TECHNICAL CHARACTERISTICS ...........................................................................................................................................17

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8.1. Fan speed capacitors ..........................................................................................................................................................17
8.2. Capacitor values for Climma Fan coils.........................................................................................................................17
8.3. Relays combination on MV8 board ..............................................................................................................................17
8.4. Part numbers of standard spares for MV8 control .................................................................................................17

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1. Introduction
1.1.General information
Thank you for choosing our MV8 control for Fan Coil !
1.2.Product features
The MV8 control for Fan Coil units has the following features:
The MV8 control connected to a digital panel MK2 or C-Touch permits to operate any Climma Fan coil with
a complete range of functions. The 8 speed control is made by means of capacitors with a perfect and totally
quiet control of the speeds from the minimum to the maximum speed. The MV8 control can manage also fan
coils with the water valve option and electrical heater.
The MV8 control accepts the supply of 230V either 50 or 60 Hz.
1.3.Directives
The Climma MV8 control respects the following directives.
• CE
• Low voltage: 2006/95/EC
• Electromagnetic Compatibility: 2004/108/EC
• Machinery Directive: 2006/42/CE
• Manufacturing quality Standards UNI EN ISO 9001:2008
1.4.Installation
The MV8 control must be installed following the instructions and specifications given in this manual.
1.5.Transport and handling
Take every precaution to prevent damage, when handling the unit or components keep in consideration the
information given on the packaging material.
1.6.Unpacking
The MV8 control is carefully packed in a strong carton box. Remove all the carton and the other packing
material. Check that the product has not been damaged.
Caution: Wear protective gloves when handling any packing materials and the wood base. Dispose of all
packaging materials appropriately in accordance with local codes.
WARNING!
Check that the technical specifications on the label are compatible with the Fan coil.

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1.7.General safety
Injuries or accidents caused by failure to comply with the recommendations of this manual are solely
the responsibility of the unit operator.
Basic Rules for Safe Operation:
• do not touch the unit with moist or wet hands or feet;
• never operate the unit while barefoot;
• before installation and maintenance operations, disconnect the unit from the power supply. failure to
comply may result in injury or death;
• installation and maintenance of this system can be hazardous due to system working pressure and
electrical components. Only a Climma certified service centre should install and maintain the system;
• to minimize the hazard of electrical shock and personal injury, this component must be effectively
grounded;
• during installation and maintenance follow safety codes, wear safety glasses and work gloves.

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2. INSTALLATION
The MV8 control must be installed in the nearby of the Fan coil which is equipped by a 3 m long cable.
2.1.Climma MV8 control technical features
The speed control of the Fan coil fan is obtained with 3+1 relays which connect individually or in
combination, the capacitors to the fan motor. There is also a relay to control the water valve and another
relay to power the electrical resistor.
The digital control panel is connected to the MV8 control by means of a cable RJ45 while the optional
ambient probe is connected to the control by a cable RJ12. The MV8 has another RJ12 to be used when
multiple boards are connected in parallel using the same digital panel.
The MV8 control has also a socket for the Modbus communication.

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2.2.Positioning of the MV8 control
When choosing the position consider that the original cable supplied with the Climma Fan coil is di 3m long.
The control box MV8 has an IP20 grade protection, therefore it must be protected from splashing and
possible water dropping.
The control box can be installed horizontally or vertically.
2.3.Fixing the MV8 control
The fixing must be carried out using the special brackets supplied with the box and which allow the box to be
fixed without removing the electronic board. The brackets are fixed to the back of the box using the screws
provided. There are 6 fixing positions. The brackets extend 27 mm from the box profile.

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3. SETTING THE MV8 CONTROL
3.1.1. DIP switch setting
The MV8 control must be set to adapt to the type of operation of the fan coil.
The types of operation are as follows:
PR0 - Fan Only: when the ambient temperature reaches the set point the MV8 control stops the fan.
PR1 - Water valve: when the ambient temperature reaches the set point the control closes the water valve and
drops the fan speed to the minimum.
PR2 - Water valve + strip heater: similar behaviour for the cool mode; when instead the ambient temperature
drops below the set point the MV8 control powers the electrical heater.
The setting is made by means of two dip switches identified in the picture:
The MV8 board comes non programmed and the 2 dip switches are both in OFF which corresponds to NPR
–No Program.
SET the dip switches of the MV8 control to comply to the configuration of the Fan coil.

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3.1.2. MV8 configuration for the C-Touch control panel
The Climma C-Touch panel allows you to read on the display the fresh water temperature detected by the
CO sensor installed at the inlet of the fan coil and connected to the MV8 board.
This function is not available on the MK2 panel and on the first version of C-Touch. On the MV8 2019 board
there is a jumper that enables or disables this function and therefore makes the C-Touch compatible or not.

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4. ELECTRICAL CONNECTION
4.1.1. Sicurezza
AVOID THE RISK OF THE ELECTROCUTION !!!
Only qualified staff can execute the troubleshooting and the repair. Keep isolated from the
ground during the execution of the electrical operations, wearing dry clothes, rubber shoes,
rubber carpets, etc.... Don’t check wires under voltage if none can bring help.
IMPORTANT NOTE
To avoid possible electrical shocks, that can cause harm or death to people, execute the
grounding of the air conditioning system, as indicated:
1- Use a suitable electrical cable with ground wire section and isolation to give the charge
from the switch on the control board of the boat to the electrical box of the system. The
ground wire must be correctly connected to the ground terminal of the panel.
2- Check that the ground connection between the electrical box and the air-conditioner
hasn’t suffer any damage during the transport.
3- Check that the connection of the water pump to the suitable terminal of the electrical box
includes also the ground connection.
4- Check the ground continuity before switching on the air-conditioner.
4.1.2. Electrical supply
Check that the ship’s supply meets the MV8 control supply which is 230V-50/60 Hz.

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4.1.3. Connection schematic

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4.1.4. Fresh water temperature probe CO
Each MV8 controller is supplied with a fresh water (CO) temperature sensor which must be electrically
connected to the CO terminals of the board. The eye-shaped sensor is instead fixed to the hose connector of
the fan coil, at the water inlet of the chiller circuit.
4.1.5. Probe CO on Fan coil –Fan only configuration
4.1.6. Probe CO on Fan coil –Water valve configuration
4.1.7. Multiple MV8 controls with a single digital control panel
It is possible to use a single control panel to manage a series of Climma Fan Coils of any model and which
are installed to condition the same ambient. The control panel must be connected to a single MV8 controller.
Each MV8 controller must be powered but only one must have the fresh water (CO) temperature sensor

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installed. The presence of the CO sensor, in fact, identifies the "master" card and the panel will refer only to
that card, regardless of whether the panel is connected to this card or to another card in the network. The
communication connection between the MV8 boards takes place with an RJ12 cable (MBUS) available in
different lengths.
The presence of other CO sensors in the multiple configurations prevents their operation.
4.1.8. Modbus communication
The MV8 board is ready to communicate with an automation system via Modbus protocol.
For this purpose, there are the gnd | A + | terminals B- | SG and also a jp1 jumper to be inserted as a line
terminator. Our customer service can provide instructions and a list of specific functions for the control panel
installed.

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5. Operation
For operating instructions refer to the manual or the instructions supplied with the control panel to which The
MV8 control is connected.
5.1.Control panel identification
To identify the type of control panel, refer to the table below.

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6. Maintenance
The MV8 control does not require any specific maintenance. It is advisable to periodically check that the
electrical box is closed correctly and that there are no traces of water ingress. It is also good to periodically
check the fresh water temperature sensor which can be exposed to mechanical stress and oxidation.

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7. TROUBLESHOOTING
Before requesting the intervention of a service point, we advise you to carry out the following checks. The
table contains tips that can solve the most common problems. If after carrying out these checks the system
still does not work, call the nearest Climma assistance centre. by calling the Veco assistance service at
+39.0362.35321 or by consulting the WEB page www.climma.it
7.1.The digital panel shows n.Pr
The dip-switch of the board is not programmed. see chapter. 3.1.1
7.2. The digital panel shows Err
The fresh water temperature sensor CO is not connected or it is defective. Check the sensor. See Errore.
L'origine riferimento non è stata trovata.
7.3.Product identification
Each product is identified with a nameplate. Refer to the description, code, and serial number in all cases of
reporting faults to the Service Centre. It is also advisable to identify the control panel that is connected to the
MV8.
Also check that the type of operation of the fan coil (Fan Only, Water valve, EH electrical heating)
corresponds to the setting of the board.
7.4.Fuses
There are 2 fuses on the board:
FI protects all power outputs (fan and water valve) with the
exception of the electrical resistance. Value 6.3 A
F2 protects the power supply of the logic part of the board. Value
0.5 A
7.5.Supply check
On the board there is an LD1 indicator light that turns on when the board is powered. If it does not turn on,
check fuse F2.
7.6.The fan doesn’t work
If the LED LD1 is on but the fan does not work, check fuse F1 which protects the power outputs of the board.
Check that the power supply voltage is not too low. Check the value of the supply voltage at the input
terminals on the MV8 board.
7.7. Erratic fan speed control
Check that the controller is compatible with the fan coil model to which it is connected. If in doubt, also check
the values of the 3 control capacitors (see 8.2).

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8. TECHNICAL CHARACTERISTICS
8.1.Fan speed capacitors
The MV8 board is an evolution of the Fan Coil Quattro MCON board. Using the combination of the 3 relays
you get 7 speeds plus the maximum speed at full voltage. The values of the capacitors and the presence of a
resistor are extremely important for the good operation and duration of the control. Each fan coil model requires
specific capacitor values, and it is essential to respect these specifications. The capacitor pack for MV8 is NOT
compatible with the Quattro version. The MV8 control is therefore standard, and the capacitor pack identifies
it for compatibility with the Fan coil model.
8.2.Capacitor values for Climma Fan coils
8.3.Relays combination on MV8 board
8.4. Part numbers of standard spares for MV8 control
Power board MV8 code M84846
Fresh water temperature probe code M72090
Remote room temperature probe (optional) code MSENS (specify the length)
Control panel connecting cable code MCAV (specify the length)
Communication cable code MBUS (specify the length).