Assortment / System Description

Operating mode changeover from heating to cooling, or vice versa, takes place via

function block "H/C changeover".

The following types of changeover are available:

• Via the operating mode selector (manually)

• Via analog input (e.g. according to the outside temperature)

• Via digital input (e.g. with a changeover thermostat installed in the flow)

• According to a calendar date

If several types of changeover are activated, the following priorities apply:

• Operating mode selector before

• changeover input before

• calendar.

2-pipe system "Heating/cooling" with production of heat and cooling energy.

Heating/cooling changeover is effected manually via the operating mode selector.

1 Production of heat

2 Production of cooling energy

3 Changeover valve

4 Manual heating/cooling changeover to changeover valve and function block "H/C changeover"

5 Forwarding of "Heating/cooling" changeover signal via the KNX bus

The RMB795B central control unit does not provide any closed loop control

functions (precontrol). Its main task is to collect the request signals and to forward

them to the heat or cooling energy source.

FB "H/C changeover"

Plant example