Changeover systems
Oftentimes, you will find units that are connected for both heating and cooling through 6-way valves or similar arrangements. For this situation, the following Base Circuits are used.
From left to right these are:
changeover with two-way valves
changeover with pressure independent control valves
changeover with flow regulators
changeover with six-way valves
Each valve shown in the Base Circuit can be changed (KV, KVS, …)
There are two connections available (one for heating, shown as a red arrow, and one for cooling, shown as a blue arrow) that need to be connected to have a successful calculation.
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On the right-hand side is the single connection, which can be connected to one distribution system with a pump or the end unit, shown below.
The information to implement here is similar compared to heating/cooling separated.