Application examples - Basic Documentation - RMK770-1

Communication via the KNX bus

Product Family
Synco
Product Group
Air conditioning controller
Content Language
English
Content Type
Basic Documentation
Status
Valid
Date
2013-04-08
Document No
CE1P3127en
Download ID
A6V10088170
Stock No.
BPZ:RMK770-1
Product No.
RMK770-1

Introduction

The "Room control combination" function can be used to link two RM… controllers so that they operate with the same operating mode and the same room setpoint. The two controllers must belong to the same "Geographical zone (apartm.)".

If one of the two controllers is an RMU controller, this controller always becomes the "Room controller master". If two RMU or RMH controllers are used in the same application, one must be defined as the master and the other as a slave.

Application example 1

Radiator and floor heating

The "Room control combination" function, for example, allows for e.g. heating a room with radiator heating and floor heating. Exchanging room temperature and operating mode over the KNX bus allows for a joint control strategy with the following aim:

  • Optimum control (e.g. boost enabled at the correct time).

  • Same room operating mode for both controllers (time switch and holiday/special day program, manual override).

  • Adjustable room influence.

Controller 1 and 2,
both type RMH

Two RMH controller are required for application "Radiator and floor heating in the same room". Controller 1 is defined as master room controller, and Controller 2 as slave room controller.

The first step is to set the zone addresses of the "Geographical zone (apartm.)" in the controllers.

Zone addressing

Set room control combination

Room control combination: Master
Transmits room setpoint and operating mode.

Room control combination: Slave, external setpoint
Receives room setpoint and operating mode.

Room control combination: Slave, internal setpoint
Retains its own room setpoint as valid, but adopts the operating mode from the master.

Application example 2

Room control combinations featuring multiple ventilation controllers

When a space is controlled by several ventilation controllers, e.g. two RMU7x0B controllers (they must be RMU7x0B controllers) controlling the temperature in a warehouse, the controllers can exchange information such as room temperature, operating mode, and setpoint over the KNX bus.

Note

With this room control combination, one ventilation controller must be set as the master and all the others as slaves.

Zone addressing

Slave ventilation controller settings

Within the room control combination, the slave ventilation controller operates with the same operating mode as the master.

The slave controllers can use either the same setpoints as the master, or individual setpoints.

Control strategy

Control strategy Room control combination Effect
  • Same room operating mode

  • Shared setpoints

Slave external setpoint The slave ventilation controller shares the same setpoint as the master:
Comfort heating setpoint
Pre-Comfort heating setpoint
Economy heating setpoint
The setpoints cannot be set in the slave ventilation controllers. Any setpoint adjustments required must be made in the master ventilation controller.
  • Same room operating mode

  • Individual setpoints

Slave internal setpoint The slave ventilation controller operates with its own setpoints.

Application example 3

Room with floor heating and ventilation

Another application of the "Room control combination" is a room with floor heating and a ventilation system. Exchanging the relevant process values over the KNX bus allows for a common control strategy with the following aim:

  • Optimum control, heating or cooling.

  • The same room operating mode for both controllers
    (time switch and holiday/special day program, manual override).

  • Automatische Umschaltung der Lüftungsregelung
    (Winter: Constant supply air temperature control, own setpoints).
    (Summer: Room/supply air cascade control).

Ventilation,
master controller RMU

The ventilation settings for an RMU master controller programmed with plant type A03 (ADC001 MU1 HQ) are carried out under:

...> Commissioning > Communication > Room
🡺 Geogr zone (ap): 3

...> Commissioning > Settings > Controller 1 > Cascade controller
🡺 Control strategy: Alternating

Heating,
slave controller, RMH

The heating settings for an RMH slave controller programmed with basic type 0-2 are carried out under:

...> Commissioning > Communication > Room 1
🡺 Geogr zone (ap): 3

...> Commissioning > Extra configuration > Heating circuit 1 > Functions
🡺 Room control comb: Ext setp (Slave internal setpoint)

...> Commissioning > Settings > Heating circuit 1 > Optimizations/influences
🡺 Room influence: 0

Note

If the same room is controlled by an RMU ventilation controller and an RMH heating controller, the RMU ventilation controller in this room control combination must be set to "Master".

Zone addressing

Heating setpoints

The heating setpoints:

Comfort heating setpoint

Pre-Comfort heating setpoint

Economy heating setpoint

are transmitted by the ventilation controller to the heating controller over the KNX bus. The existing setpoints in the heating controller are overwritten.

Both controllers operate with the same heating setpoint. If a heating controller setpoint needs to be adjusted, it must be changed in the ventilation controller (master).