4. Installation Walkthrough
4.2. Heating and Cooling Circuits
4.2.2. Mixing Valves MV1 and MV2
If the system water temperature may be higher (or lower) than the temperatures needed for circuit 1
(
or circuit 2) in a heating or cooling operation, then a mixing valve can be added to the circuit, and
connected to the MV1 (or MV2) port on the indoor unit.
The unit will control the mixing valve, continuously mix the supply, and return the water of the circuit
to have its temperature read via the TV1 (or TV2) until the value set under the above menus is achieved.
TV1 and/or TV2 should be activated on the installer’s level via the “Heating and Cooling Circuit” menu.
Note:A mixing valve is needed, if:
•
The system has two circuits that require different water temperatures. The heat pump will
have to take the higher/lower (depending on whether heating/cooling) settings of the two
circuits as the set temperature for the heat pump. The mixing valve ensures correct water
temperature circulation in this instance.
•
The system has other heating sources inside that are not controlled by the heat pump. In this
case, the actual water temperature may exceed the set temperature.
54
