How to properly connect a Nordic Tec plate heat exchanger?

Nordic Tec plate heat exchangers have arrows on the nameplate, which are intended to remind the installer that the method of connection must consider the counterflow principle. This means that fluids flowing through the exchanger in its two channels must flow in opposite directions. Failure to adhere to counterflow is one of the most common mistakes when connecting, resulting in a significant decrease in heat transfer efficiency, meaning - an installation with such a connection of the exchanger does not work properly.

However, sometimes we don't really like this method of connection. We would like to connect the device counter-currently - but preferably in the opposite way to the arrows on the label... No matter how we rotate the exchanger - we don't really like the connection according to the arrows, and we are not willing to undergo laborious modifications to the installation...

The answer is simple - we can freely reverse the flow direction, as both channels of the exchanger have the same capacity in both directions. The arrows are only a reminder and are not binding for the installer or user. However, it is important to remember that when changing the flow direction of one channel, we must always change the flow direction on the other channel of the exchanger to maintain the counterflow principle.

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Can we change the position of the heat exchanger in any direction?

Not entirely, there are also other rules for connecting the heat exchanger. Remember that regardless of the situation - the exchanger should be mounted vertically. Mounting horizontally does not ensure proper venting of the device, and an airlocked exchanger often becomes clogged or completely blocked.