Last seen: Dec 2, 2025
The secondary pump runs all the time when there is a demand for heating and when in the Thermo Off situation. Yes the power cut turned the heat pump...
JamesPa. Data for the 26 November -4C OAT during night. 11C OAT during latter day. Water Temperature FIXED @ 31C. This temperature is a litt...
JamesPa I plan to send you a chart tomorrow of todays (26th) result. Just to make sure I am giving you what data you need.
I wish I had only 9 defrosts in that timeframe. I had 16 in the early morning of just the 26 Nov.
Sim0n0. I also have the Hitachi Yutaki system. Also having lots of problems.
Thank you for the reply. I think you are saying that what I am seeing is normal (Evaporator -23C. OAT -4C. Defrost cycle every 46 minutes). ...
You could be right in that it's a region between the 2 dotted lines. It's not clear to me what the chart really means, not my area of knowledge. May...
Concerned about the noise and build up of ice. I believe that the evaporator should not be getting down to -23C, based on the algorithm. If I am inte...
Yes the unit always performs its defrost cycle, every 40 minutes, and the ice always clears. With the evaporator at -23C when it starts its defrost c...
Thank you. The pipe work is now insulated. Finding a heating eng that knows Hitachi units in this area is difficult. However, as you said a quali...
It sounds like its ice build up and does not sound good. Looking at the algorithm it looks like I am set to the Jo-0 setting, but I don't fully under...
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