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PUHZ SW120Y & EHSC-VM2D - Buffer tank to Volumiser

 
Air Source Heat Pumps (ASHPs)
Last Post by DavidAlgarve 10 months ago
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 DavidAlgarve
(@davidalgarve)
Reputable Member Member
Joined: 3 years ago
Posts: 248
Topic starter 13/10/2025 4:35 pm   [#2513]

Eventually I was able to find someone here in the Algarve to, amongst other things, convert my buffer tank to a volumiser and in the process remove the secondary pump. They failed on the Wireless Controller and the support from Mitsubishi Portugal throughout, was utterly deplorable.

I picked up from somewhere that  a dip switch should have been changed when a buffer tank is not used and in lieu of assistance from Mitsu Portugal I put this question to Mitsu UK:

"I thought I recalled that a dip switch change was required, but the contractor had no knowledge of this.
I have studied the manual and see that SW 2-6 is for On/Off “Mixing Tank”."

The reply was:

"If you are a homeowner we cant advise on electrical or dip switch issues and this would require a callout to investigate"

So, with the heating season imminent, I am stuck.

Is anyone able/ willing to confirm the facts re this switch selection? 

 


342sq m "Upside down" house in Algarve. Portugal
Mitsubishi PUHZ-120YUK 12kW ASHP
12 Solar Panels Growatt Inverter
2 x Growatt 7.5kW Batteries
Fronius EV Charger
Kia e- Niro 64kW


   
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