VRVMASTER

1.Introduction #

Heat room by room with a simple and fast connection

VRVMASTER

This gateway is a module designed to connect directly to the VRV/VRF air conditioning bus in order to control temperature without modifying the thermostats. Integrated with SynapseCore via IP network, it optimizes comfort, reduces energy consumption by up to 30%, and extends equipment lifespan.

Multi-brand, non-intrusive and compliant with the BACS regulation, it enables centralized control of more than 250 units for simple and efficient HVAC retrofits.

Features

Smart control based on occupancy or scheduling

Adjust setpoints according to occupancy to prevent energy drift.

Multi-brand compatibility

Works with most VRV/VRF manufacturers on the market – quick validation with our project teams.

Non-intrusive installation

Connects directly to the VRV bus without replacing thermostats, with no construction work or system downtime.

Native integration with SynapseCore

Combines HVAC control, ambient sensors and room bookings through local or cloud-based scenarios.

Scalable centralized supervision

A single module can manage up to 32 indoor units, and up to 255 with the PRO version.

Cost-effective solution without mandatory sensors

Leverage the internal probes of the units for an economical deployment.

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2.Installation and commissioning #

The VRVMASTER is installed by EWATTCH. If needed, you can consult the guide below.

Download the manufacturer’s installation guide here

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3.Data available on Ewattch Cloud #

Once the product is connected to your SynapseCore, you can monitor in real time and control all your indoor units from a single interface on Ewattch Cloud.
The available information and controls include:

Operating modes: selection and adjustment of operating modes (Cooling, Heating, Auto, Fan, etc.).
Temperature setpoints: precise adjustment of target temperatures for each indoor unit.
Setpoint limits: definition of minimum and maximum allowed ranges to prevent energy drift.
VRV/VRF system technical data: access to HVAC bus information (unit status, alerts, measured temperatures, fan speeds, etc.).

These features enable centralized supervision and fine control of your installation, optimizing both comfort and energy performance.

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4.Use on Ewattch Cloud #

Complete BMS Control

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5.Technical specifications #

Network & Power Supply

Ethernet: 100 Mbps (RJ-45)
Power Supply:
- Minimum load: 5 V / 175 mA (via mini-USB); 12 V / 120 mA; 24 V / 70 mA
- Maximum load: 5 V / 300 mA (via mini-USB); 12 V / 200 mA; 24 V / 120 mA

Interfaces & Communications

USB: 1 x USB Host port + 1 x USB Device port (12 Mbps)
RS232: DB9, 9,600 bps, ASCII
RS485: Modbus bus (A/B) – up to 1,000 m
Digital Inputs / Outputs (I/O): Configurable inputs/outputs (optional)
Touchscreen: 2.8″ color display (240 × 320) – local interface for configuration and control

Environmental Conditions

Operating Temperature: -10 °C to +60 °C
Storage Temperature: -20 °C to +70 °C
Operating Humidity: 0% to 96% non-condensing
Storage Humidity: 0% to 98% non-condensing

Dimensions / Physical

Dimensions (H x W x D): 156 mm × 90 mm × 35 mm
Weight: approx. 200 g
Material / Enclosure: ABS enclosure – wall-mounted or DIN rail mounting
Mounting: DIN rail or wall mounting

Capacity & Usage Limits

Maximum Connected Units: 255 indoor units (total)
Compatibility: VRF / HVAC systems from Daikin, Mitsubishi, Toshiba, LG, Samsung, Fujitsu, Hitachi, etc.
Multiple Communication Lines: Ability to connect multiple VRF lines / brands to a single device
Supported Protocols: Modbus TCP, BACnet IP, ASCII

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6.Hazards and warnings #

Failure to comply with the instructions in this manual shall void the manufacturer’s liability. Any intervention on the product must be carried out by a qualified professional. Product replacement must be performed by a qualified professional. The device must be used in accordance with the specifications provided in this documentation. Failure to do so may result in hazardous situations. No part of the device may be replaced or removed. Disconnect all power supplies before carrying out any work on this device. Only accessories compliant with the specifications in this documentation may be used.

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7.References #

E-VRVMASTER: Standard version, control of up to 32 indoor units.
E-VRVMASTER-PRO: PRO version, extended control up to 255 indoor units with advanced technical data for large commercial sites.

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8.Contact #

13, Rue Maurice Jeandon
88100 Saint-Dié des Vosges
FRANCE
sales@ewattch.com
+33(0)3.29.57.75.97
www.ewattch.com

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