RonDubber

We installed the heat pump. All it needed was inlet and outlet water connections, single phase power supply and control connections between S2 and S3 on the FTC and heat pump. Every thing checks out ok. The only requirement on power up is that the heat pump should be powered up before the FTC. All the installation switch settings are as specified in the manual. The only switch setting to change on the heat pump is SW1-3 switch to on (factory pre-set is off).

Well, the saga continues! Have installed the FTC exactly as specified. Double checked all the switch settings and double checked again and double checked by my electrician. Still does not work. What we have noticed is: On the FTC, led 2 does not light and there is no power to the remote controller supplied with the FTC. Also on the heat pump (PUHZ-W85VAA) the display shows P2. This code is not shown on any error codes and I can't find any ref to P2 on the internet. So, we are completely baffled. I am reluctant to contact Mitsubishi tech team as they have completely mislead me from day one. Do you think I should give them another go?

Thanks Tony. It all makes sense now.

It's been 3 months of discussions with Mitsubishi and they kept telling me different things, so I made an official complaint and put a pore report on the web. I finally got the help I needed. The last person I spoke to was finally aware of the problem and he admitted that I was given the wrong information from their sales and the technical department had given me wrong and conflicting advise. PeterW, you are right I must have their FTC and they have supplied me with PAC-IF033B-E. Finally getting there. I contacted them to say, the heatmiser gives a signal 230V when calling for heat. They replied "The input must be volt free or it will damage the FTC." Any idea what do I need to do? Sighting the thermistors and setting the dip switches is ok. It's just this volt free input which concerns me.

Thanks guys. I contacted Mitsubishi direct in the UK. The only thing they questioned when sizing the unit was the min op temp as we are in Normandy, My electrician said he as trouble all the time getting information out of manufacturers when trying to interfacing 2 bits of kit Let see if the the 2 companies do talk to each other. I will keep you posted. It can be resolved. It's just a matter of when. Thanks again for your time.

I think I need to give you a bit of history. Before I embarked on this I went to 3 companies (i looked at many) before choosing Mitsubishi. I told them I was putting in UFH on 2 floors. one with 4 zones and one with 7 zones. I was told they did not supply any thing for UFH but could supply the air / water heat pump. I chose a company for the UFH equipment (Continal). I then told Mitsubishi what equipment I was using and they recommended PUHZ-W85-VAA as it suited my application and all I would have to do is is connect the heatmiser to the control terminals on their unit. That is why I bought this unit. It wasn't until I installed every thing that I realized that they don't tell you what connects to what. I have sent an email to Mitsubishi suggesting that their technical department should speak to heatmiser's technical department. I'm waiting for the out come. If I get a reply you will be the first to know.

Hi ProDave This is all the manual tells (attatched pdf) not much use. The picture above is from the inside cover of the unit. I had 3 quotes before I chose Mitsubishi and all 3 told me I did not need an Inside unit as I was not using it for DHW. They said all I need to do is control it direct from the FTC (heatmiser) This is Heatmiser's reply: "It is the boiler enable connection on the UH8-RF which is the connections on our end. I am afraid I do not know the connections on the air pump, however whatever you put in on Com will go out on NO, therefore if 230v goes into Com, then it will switch 230v, if on the other hand if 0v goes into Com, then 0v will go out." Any ideas? VAA Installation Manual.pdf

Can any one help? I have installed UFH using 'Heatmiser UH8-RF' I have a Mitsubishi heat pump PUHZ-W85-VAA The system is for UFH only. The hot water is totally independant. Does any one know how to connect the controls? Mitsubishi and Heatmiser can not or do not want to help. The heatmiser works wonderfully, doing every thing it should for the manifolds. I just need to get some hot water from the heat pump. I know the heatmiser connections to use are C and NO on the boiler connections (I think). The Mitsubishi unit as control connections S1, S2, and S3 but they don't know how to connect. It was suggested by Mitsubishi that S1 sould be ignored and use S2 and S3. This does not work. Do I need another bit of kit? Please please help if you can. Pics of the panels attached.

Hello from France, My wife and I have retired to France, Normandy (it's too hot down south). We have been going back and forth for some years waiting to sell our house in Wales. We finally sold and moved here permanently in Feb 2019. All is good and no regrets. I don't know if it was a good idea but we found the perfect house with an acre of land and 360 deg views over wonderful country side which needed renovating. No big deal as such but I am not as young as I used to be. Most is done and looking good. I do have some issues I need help with, but the rewards, well, wonderful. So, i will be asking for a little help. Please keep an eye out.