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Last seen: Jun 8, 2026
Hitachi Yutaki SCombi Heat Pump(Indoor Unit ) RWD-3.0RW1E-220S-K(Outdoor Unit) RAS-3WHVRP1 2024 build bungalow200m2High level of insulationUnderfloo...
@robs On the 5. 10kW Viessmann Vitocal in Sheffield. What is causing the heat pump to turn off and on every hour (approx). It it a room thermostat o...
Thanks for your help.
I have no idea, to me there is no logic. There is no information on-line about this Hitachi system, so a bit of a loss.
The heat generated in the 5 minute period is with the pump on which goes to the manifold and floor. My de-ice cycle is exactly as yours.
In the 5 minute period the compressor is running, taking electrical power and producing heat. This, what Hitachi call a "Thermal Off" I might call a ...
The first dip is the thermal off period where the compressor stops for 3 minutes and the refrigerant in the pipe from the heat pump to the internal un...
The fan does turn off, water from inside is then pumped in reverse, power is take to heat the water and then the fan and compressor runs. Takes about...
@editor I just wanted to know other owners thoughts and experience of this system. I am having issues with short cycles and getting steady flow tempe...
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