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Description

The HVAC Universal Interface allows you to connect a VRV, VRF or multi-split air conditioning system (HVAC system) to the
Niko Home Control installation. This module acts as the interface between the air conditioning system and the Niko Home
Control gateway and allows communication between both devices.

Overview

Order numbers

550-00551: HVAC interface for Daikin VRV
550-00552: HVAC interface for Sanyo (Panasonic) VRF
550-00553: HVAC interface for Toshiba VRF
550-00554: HVAC interface for Mitsubishi Electric VRF
550-00556: HVAC interface for LG VRF
550-00557: HVAC interface for Fujitsu (Atlantic) VRF
550-00558: HVAC interface for Mitsubishi Heavy VRF
550-00559: HVAC interface for Hitachi VRF
Visit www.niko.eu (under Products > Niko Home Control) to find out which HVAC systems are supported.


Operation

The HVAC interface allows you to control an HVAC system using a Niko Home Control HVAC thermostat. See Push buttons
with display.

Only one HVAC interface is needed for the different HVAC systems. Only one HVAC interface can be connected to an HVAC
system. To connect a multi-split air conditioning system, you will need an additional module in each indoor unit.

  • It is not possible to combine different brands of air conditioning systems into one Niko Home Control installation.
  • It is not possible to connect an additional heating element to the HVAC thermostat.
  • The HVAC interface synchronises the Niko Home Control installation and the HVAC system every 10 minutes and after every action from the installation. The parameters that will be synchronised are: heating/cooling, on/off, ventilation speed, desired temperature and temperature settings.
  • A maximum of 20 HVAC thermostats can be connected to the Niko Home Control installation. This means you can create up to 20 zones.
  • The Niko Home Control installation can control a maximum of 8 indoor units per zone/HVAC thermostat.
  • The HVAC system has its own order of priority when responding to various commands from different zones.


Installation

Connection diagrams


  • To avoid crosstalk in new installations, connect all SELV cables on the left inside the electrical cabinet and all high-voltage cables to the right inside the electrical cabinet.
  • Group all low-voltage modules together, such as the Nikobus interface or the Easywave RF interface, to ensure that the Nikobus cable or the antenna can run alongside the SELV cable.

Connecting and mounting the HVAC interface


The ‘ventilation speed control’ and ‘room temperature monitoring’ functions are not available when the HVAC interface is connected to a Daikin KRP with DTA D3 interface. Hitachi models do not transfer temperature to the thermostat
  • Preferably, use an HVAC system that is galvanically isolated from the mains.
  • Do not connect more than one HVAC interface to the Niko Home Control installation.
  • The resident must ensure that the Wi-Fi network is secure. This protection is necessary for using the app on a smartphone or tablet.


  1. Connecting the HVAC interface to a VRV or VRF air conditioning system or a multi-split air conditioning system:

    • To connect the HVAC interface to a VRV or VRF air conditioning system, connect the HVAC interface via a two-wire HVAC bus cable to the indoor unit(s). The following table provides an overview of the bus connection to the indoor unit(s) for each type of HVAC system:

      HVAC SystemCommunication networkBus connectionPolarityNo. of indoor unitsNo. of outdoor unitsShielded network cable
      DaikinD3 NetF1 F2None6410Not required
      ToshibaTCC LinkU1 U2None 6410Required
      Sanyo (Panasonic)S3 NetU1 U2None 6410Required
      Mitsubishi ElectricM-Net(TB3,TB7)M1 M2None 5010Required
      Fuijitsu (Atlantic)VRF transmission lineX1 X2None 6410Required
      Mitsubischi HeavySuper Link New Super LinkA BNone 12810Required
      HitachiH Link, H Link 21 2None 6410Required
      LG
      Inter A, Inter B (only outdoor)None 12810Required

      The HVAC interface is equipped with a USB port and seven connections: L1 – L7. Five of these seven connections can
      be controlled simultaneously, but L2 and L6 cannot because they share the same electronics. The next table gives an
      overview of which connection on the HVAC interface must be used for which system.

      HVAC ManufacturerAbbreviationUSBL1L2L3L4L5L6L7
      DaikinDK







      Misubishi ElectricME







      Sanyo (Panasonic)SA







      ToshibaTO







      HitachiHT







      Fuijistu (Atlantic)








      LGLG







      Mitsubishi Heavy IndustriesMH







      GreeGR








    • To connect the HVAC interface with a multi-split air conditioning system, you must first connect an additional module (PCB connection) for each indoor unit. The HVAC interface cannot be connected directly to the indoor unit(s) of a multi-split air conditioning system. The supplier of the HVAC system should supply these additional module(s) to be connected to the two-wire HVAC bus cable.


  2. Open the flap on the top right-hand side of the HVAC interface and check to ensure the dip switches are set as follows.

  • DIP Switch P 

    SwitchOnOff
    P3L6 active, L2 inactiveL2 active, L6 inactive
    P4production modenormal operating mode
  • DIP Switch Q

    HVAC typeDIP switch Q - HVAC line L1
    Q1Q2Q3Q4
    DKONOFFONOFF
    MEOFFOFFOFFOFF
    TOOFFONOFFON
    SAOFFONOFFON
  • DIP Switch R 

    HVAC typeDIP Switch R - HVAC line L2
    R1R2R3R4
    DKONOFFONOFF
    MEOFFOFFOFFOFF
    TOOFFONOFFON
    SAOFFONOFFON
    If all DIP switches R1, R2, R3 and R4 are placed in the ON position, the HVAC interface goes into BOOT mode.
  • DIP Switch S 

    SwitchONOFF
    S1,S2turn on DC output on HVAC line L1turn off DC output on HVAC line L1
    S3,S4turn of DC output on HVAC line L2turn off DC output on HVAC line L2

 3. Press the HVAC interface anywhere onto the DIN rail until it clicks into place.

 4. Connect the bus of the HVAC system to the green interface connector (included). Click the green interface connector at the bottom/top on the HVAC interface on line L1, L2, L3, L4, L5, L6 or L7, depending on the type of indoor unit that is used.

 5. Connect the cables supplied (RS232 cable and RS232 USB cable) to each other.

 6. Connect the RS232 connector to the HVAC interface and the USB connector of the RS232 USB cable to an available USB port on the connected controller.

 7. Connect the power adapter to the HVAC interface and connect the adapter to the mains.


The display and the green LED will light up.

The orange LEDs blink:

  • during data transfer from the HVAC thermostat to the HVAC interface
  • only if line L1, L2, L3, L4, L5, L6, L7 is connected to an indoor unit.

LEDcolourstatusstatus
connectiongreen

on

off

good connection

no connection

activityorangeblinkingdata transfer


Information on the display

When there is communication with the HVAC system, the display provides extra information about the installation. Below,
you can see an example of this type of display. The values shown in the example are only indicative and could differ from
actual values.
Information shown on the display with the status of the indoor units:

Information shown on the display with the number of indoor units and zones:


Value displayedSymbolValue in the example display
No. of recognised indoor unitsU10
No. of groupsG8
Error code
A3
Error code
U4


Troubleshooting


ProblemPossible causeSolution

No information appears on the

display

Maltfunctioning power supply

Verify that there is a steady signal from the 9V

DC power adapter

The number of indoor units displayed

on the display is not correct

It may take a few minutes before the

HVAC system is recognised.

There is a problem with communication

to the HVAC system.

  • Wait five minutes
  • Check communication to the HVAC system. The orange LED must blink.
  • Check conneciton between the HVAC bus cable and the HVAC system


Technical data

  • power supply voltage: 9 – 24 Vdc
  • installation method: wall mounting or DIN rail mounting
  • operating conditions:
    • ambient temperature: 0 - 45°C
    • humidity: less than 85 % RV
  • dimensions: 90 x 155 x 33 mm (H x W x D)
  • weight: 270 g
  • maximum number of indoor and outdoor units: depends on the manufacturer
  • maximum length of the RS232 cable: 25 m
  • maximum length of the ethernet cable: 100 m
  • CE marked


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