Universal HVAC Interface (CoolMaster)

Applicability

This link takes you to the product page. There, you will find detailed specifications, all compatible articles, certificates of CE-marking, etc.

This online manual is applicable to the following product(s):

550-00550 | HVAC universal interface (Coolmaster)

This article can be used for all compatible HVAC systems. The HVAC universal interface replaces the HVAC interfaces for specific brands that are no longer available (550-00551, 550-00552, 550-00553, 550-00554, 550-00556, 550-00557, 550-00558, 550-00559).

Description

The HVAC Universal Interface allows you to connect a VRV or VRF 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 connected controller and allows communication between both systems.

Operation

You can connect your entire HVAC system, within the following limits:

You can use only 1 CoolMaster per Niko Home Control installation.
The HVAC interface can interact with a maximum of 32 indoor units.
You can create up to 20 zones in one Niko Home Control installation.
You can add a maximum of 8 indoor units per zone. The HVAC system has its own order of priority when responding to various commands from different zones.

To check compatibility, verify if the required connection terminals are present on your indoor unit, as described in Connecting the CoolMaster. If you are not sure, please contact customer services.

The functionalities are limited for the following HVAC brands:

Daikin KRP with DTA D3 interface does not support the ‘ventilation speed control’ and ‘room temperature monitoring’ functions.
Hitachi models do not transfer temperature to the Niko Home Control installation.

You can control your HVAC installation via:

Niko Home app, on a tablet (optionally attached to a wall in your home) or your smartphone
Digital black
Touchscreen 3 (only for older systems that contain an HVAC thermostat)

The HVAC interface synchronizes the Niko Home Control installation and the HVAC system every 10 minutes and after every action from the installation. The following parameters will be synchronized:

Heating/cooling
On/off
Ventilation speed
Desired temperature
Temperature settings

Installation

System overview

To avoid crosstalk in new installations, connect all SELV cables to the left inside the electrical cabinet and all high-voltage cables to the right inside the electrical cabinet. Group all low-voltage modules together.

The CoolMaster must be connected to the LAN port of the connected controller to allow communication with the Niko Home Control installation.

The CoolMaster is connected to the HVAC units via a wired connection.

CoolMaster components

L8 - HVAC Line 8 (USB Host)
Power
Power Plug
RS232 Port
L1 - HVAC Line 1
L2 - HVAC Line 2

L3 - RS485
Ethernet Port
GPIOs
L7 - HVAC Line 7
L6 - HVAC Line 6
L5 - HVAC Line 5

L4 - HVAC Line 4
USB Device Port
DIP Switches P, Q, R, S
LCD Touch Screen

1. Mounting the CoolMaster

Mount the CoolMaster, by one of the following methods:

On a wall: Fix the screws to the wall at the position of the mounting holes (A). The distance between the center points is 79 mm.
On the DIN rail: Place the mounting feet (B) on the DIN rail, push the lower part of the device onto the DIN rail to lock it in place. To detach, pull down the mounting lock (C) at the bottom of the device.

2. Connecting the CoolMaster

The 550-00550 (HVAC universal interface) comes with a default configuration for Daikin VRV. When using another HVAC, the interface needs to be configured accordingly (DIP switch setting, and HVAC line setting via its display).

To connect the HVAC interface to a VRV or VRF air conditioning system, connect a two-wire HVAC bus cable between the terminals on the indoor unit(s) and the connections on the CoolMaster (using the included interface connector).

The table below provides an overview of the connection terminals on the indoor unit(s) for each type of HVAC system and the corresponding connection on the CoolMaster:

HVAC System	Connection terminals on indoor unit	Polarity	Connections on HVAC interface (CoolMaster)	Shielded network cable
Daikin*	F1 F2	None	L1 or L2	Not required
Panasonic/Sanyo	U1 U2	None		Required
Toshiba	U1 U2	None		Required
Mitsubishi Electric	M1 M2	None		Required
Hitachi	1 2	None		Required
Haier	P Q	None		Required
LG	Inter A, Inter B (on outdoor unit)	+ -	L3, L4, L5, L6 or L7	Required
Gree/GMV4 VRF	G1 G2	+ -		Required
Mitsubischi Heavy Industries	A B	+ -		Required
Samsung	F1 F2 or R1 R2	+ -		Required
Midea	X Y E	+ - GND		Required
Trane	X Y E	+ - GND		Required
Chigo	X Y E	+ - GND		Required
Blue Star	A B	+ -		Required
Fujitsu	X1 X2	None	L8	Required

*It is required to configure a centralised (group) address in the Daikin system.

When you connect HVAC units of multiple brands, take into account the following limitations:

When DIP switches P1 and P2 are "ON", lines L6 and L7 cannot be used as separated lines. In this case the polarity on the HVAC cable connected to L7 will be automatically detected.
Line L2 can not be connected simultaneously with line L6 and line L1 can not be connected simultaneously with line L5

3. Dip switch settings

Open the flap on the top right-hand side of the HVAC interface and check to ensure the dip switches are set correctly, according to the tables below.

DIP Switch P

Switch	ON	OFF
P1 and P2	Link L6, L7 and enable polarity auto-detecton on L7	Separate L6, L7
P3	L6 enabled, L2 disabled	L2 enabled, L6 disabled
P4	N/A	Normal operating mode

P1 and P2 must be in the same position.

DIP Switch Q and R

DIP switch Q and R are used to adjust the internal parameters of HVAC lines L1 and L2.

HVAC System	Q1	Q2	Q3	Q4
Daikin	ON	OFF	ON	OFF
Mitsubishi Electric	OFF	OFF	OFF	OFF
Toshiba	OFF	ON	OFF	ON
Panasonic/Sanyo	OFF	ON	OFF	ON
Hitachi	OFF	ON	OFF	ON
Haier	OFF	ON	OFF	ON

HVAC System	R1	R2	R3	R4
Daikin	ON	OFF	ON	OFF
Mitsubishi Electric	OFF	OFF	OFF	OFF
Toshiba	OFF	ON	OFF	ON
Panasonic/Sanyo	OFF	ON	OFF	ON
Hitachi	OFF	ON	OFF	ON
Haier	OFF	ON	OFF	ON

If all DIP switches R1, R2, R3, and R4 are in position ON during a power reset, the CoolMaster will be forced into BOOT Mode.

DIP Switch S

Switch	ON	OFF
S1 and S2	Enable DC output on HVAC line L1	Disable DC Output on HVAC line L1
S3 and S4	Enable DC output on HVAC line L2	Disable DC Output on HVAC line L2

S1 and S2 must be in the same position.

S3 and S4 must be in the same position.

These settings are only applicable if you need to connect the HVAC interface to a non-VRF system via a KRP or MAC adapter and no other DC source is present on this line.

4. Powering the CoolMaster

Power the CoolMaster, by one of the following methods:

Connect the power adapter (included) to the HVAC interface and connect the adapter to the mains.
Connect directly on DC power supply from the local electrical panel.


Input voltage: 12 Vdc	Input voltage: 12 - 24 Vdc

The display and the green LED will light up.

5. HVAC line settings

Abbreviation	HVAC System
DK	Daikin
HT	Hitachi
HA	Haier
ME	Mitsubishi Electric
TO	Toshiba
PN	Panasonic
FJ	Fujitsu
LG	LG
SM	Samsung
MD	Midea
CG	Chigo
GR	Gree
AU	AUX
BS	Blue Star
MH	Mitsubishi Heavy Industries