Control relay integration of AC units

Control relay integration of AC units connects the 401-D guest room management system into heating or cooling units. The integration is done with a potential-free relay connected to the DALI bus and it requires installing the relay in all guest rooms where integration is needed.

How it works in a guest room

Room statusInformation flowEvents
Occupied
Control relay → AC unit
Mount Kelvin turns the lights on and sends an input signal to the AC unit to change its state to mode 1.
Unoccupied
Control relay → AC unit
Mount Kelvin turns the lights off and sends an input signal to the AC unit to change its state to mode 2.

Mode 1 Relay is closed

Temperature goes to setpoint and fan speed is set to a medium setting. Guests can use the thermostat to set the temperature and fan speed to their preferred temperature.

Mode 2 Relay is open

Cooling/heating is set off and fan speed is set to a low setting. Guests cannot use the thermostat to set the temperature or fan speed.

The AC unit control system must be programmed to receive an input signal from the control relay. Most modern AC units offer a control system variant that supports relay-based control.

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The control relay integration can also be used for other compatible heating or cooling units, such as underfloor heating for the bathroom.

For more information please contact support@mountkelvin.com

Control relay unit

Installation

The relay unit is potential free, and voltage input can be connected to AC control unit voltage output (Circuit A). Alternatively, if the AC control unit control input can accept 230V AC, the relay can be used to provide a 230V output signal (Circuit B).

Helvar493-installation-instructions1076.0KB