Note
: If TV1 is not connected, while it is activated via setting here, unit will show relative failure code.
3.1.5 Heating & Cooling circuit 2
Control of Mixing Valve 2(MV2):
If system water temperature may higher(lower) than temperature that are need for circuit 2 in heating
(cooling) operation, then a mixing valve can be added to circuit 2, and connected to MV2 port in indoor
unit.
Unit will control the mixing valve, mix the supply and return water of circuit 2 to have the temperature
read via sensor TV2 get to value set under menu “Heating & Cooling Settings circuit 2”.
If so, TV2 under menu “Heating & Cooling Settings circuit 2” should be activated under installer’s
level:
Note
: If TV2 is not connected, while it is activated via setting here, unit will show relative failure code.
Tips:
When Mixing valve is needed?
In general, if system water temperature may higher(lower) than temperature that are need for this
circuit, then a mixing valve is needed.
A.If a system has two circuits, these two circuits may require different water temperatures. Heat pump
has to take the higher(lower) setting among two circuits as the set temperature for heat pump when it
works in heating(cooling). Thus, a mixing valve is needed for the circuit that with lower(higher) setting
to ensure it gets water with correct temperature circulates in the circuit.
B.If a system has other heating source inside that is out the control of heat pump (e.g. Solar system), as
the actual water temperature may exceed the set temperature of heat pump, a mixing valve is also needed
to ensure the circuit gets water with correct temperature circulates in the circuit.
3. Installation
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