joe90

I have i joists and think they are great, no sag, no twists, over engineered, you can cut quite a few holes in them as long as the cuts/holes are in the right places.

I must confess my cloak room door opens the wrong way (must open outwards to comply with regs) but I am hoping he does not spot it, or I tell him if I alter it I will only change it back again as soon as he leaves ?.

Exactly, which is why my system is ass about face, my heat pump energises the valve when calling for DHW. Yet the instructions on the heat pump wiring and valve instructions say the opposite. I still can’t believe I am the only one to have had this problem. many thanks you guys ?

@Nickfromwales has confirmed that a diverter valve should sit at heating normally and on DHW demand power up. This is what my ASHP diagrams show but the valve I have (which I cannot reverse the head on) is the opposite. Am I the only one to have a diverter valve that does this?. I am going to drain it down and reverse the valve, should cure the problem (at last). Sorry for the long thread I just could not get my head around it.

I second all above, yes any damp on laying the GRP is a no no. Yes, bodge it to get over the winter and if we get a good summer or extended dry period next summer rip the GRP off and see what’s below, OSB is not expensive in the scheme of things .

Well done @Gav_P and @ProDave. Just shows the power of this forum (dont I know after all the help I have received). I am going to send my board to @ProDave but wont hold my breath as it’s more complicated than a transformer swop. ?

I am very interested in this thread as because of programming problems it looks like I have to use a separate room stat in the hallway rather than the controller in the cloakroom. Re opening doors, we have a porch around the front door and the back door inside the conservatory, my reasoning, both act as an air lock to reduce heat loss on opening doors (I just have to train the wife to close doors before opening others ?). I have a floor probe for the room stat but dismissed it after reading @JSHarris blog on the subject. I too would like to up the temp in the lounge slightly (as it’s where we tend to sit doing nothing) and hoped to do this by upping the flow from the manifold???

A stiff drink at least.

Sorry, just re read all above @Nickfromwales is right (as always!) I have a two way diverter valve .(it just diverts the wrong bloody way?)

Just tried this before I leave and I have got it off, the spindle only moves about 30’, yes I can get warm weather both sides, it won’t go on the other way round!. I will have to drain and swop it around.

I have to go away for 48hrs again so will try this when I return. Thanks chaps.

AAAAHHHHHGGGGGRRRR, can’t get the head off, it’s in an awkward position and the back screw didn’t release th e head, having a coffee and calming down.

Ah ha, I was told you can’t reverse them!!!, will check it out, thanks buddy.

Yes mate, cross posted with you. Like you I would assume energised for DHW .

In a nutshell it’s this, my ASHP delivers power to the three way valve when it goes into DHW mode and no power when in heating mode. The three way valve i have works the other way round . I can get over this by reversing the three way valve but can’t believe I am the only one to have noticed this!!!. My command unit cant use the inbuilt room stat if you set the heating water temperature (not use the inbuilt temp which might lead to defrosting), I can get round this by using a separate room stat (with dry contacts!!!). Very annoying.?

Oops, wrong link ://heatingcontrols.honeywellhome.com/Documents/Installation-Guide/pdf/1082.pdf

Right guys, in particular order its a Honeywell three three way valve ://heatingcontrols.honeywellhome.com/documents/Installation-Guide/pdf/1083.pdf I have forced it into DHW mode to test and forced it into heating mode to test, this was confirmed by the command unit. when in DHW mode the three way valve is energised but hot water goes to A (heating), when in heating mode the three way valve returns and the hot water goes to B (DHW). I can reverse the three way valve but this is not what I should have to do!!!!

Question, if I set the heating water temp to 40’ and this heats the UFH buffer tank, will the ASHP switch itself off when it has reached this temp? Or will it require a tank stat to tell it to power off?

To get things “going” I forced it into DHW mode but because the three way valve works backward it successfully charged the UFH buffer tank! And finally appeared to get hot. ?. I have changed the water temp (heating) to 35’ and manually set the three way valve open so will see if it heats the buffer when it’s temp drops. I am leaving the DHW tank on immersions as I will get it in the neck if SWMBO has a cold shower?. its the three way valve working backward that has foxed me, I have asked my plumber friend if he can spare me an hour next week to get his take on this. i am relieved however that my Ebay special ASHP is working and it’s just the controls that are playing silly buggers.

Just got back and started again!!!. With the control unit set up I can get it to “deliver DHW” and the pipework gets slightly warm but not as hot as I would expect ? It appears the three way valve works the wrong way round, this from Honeywell installation instructions “The valve MUST NOT be fitted on the return pipework under any circumtances. Flow from the boiler must be connected to port AB, the radiator circuit to port A and the hot water cylinder circuit to port B.” however on mine when DHW is called for the three way valve operates but the “warm” water goes to A (heating not DHW) hence the original reason I thought the three way valve was the wrong way round. am I going mad?

Not got back home yet, I plan to start on it Thursday , will update.

Didnt time it but about 10 min, now I am back home I will investigate again tomorrow.

Trying to test this but I don’t get a constant hot temp from the heat pump to see what pipes are getting hot, command unit says the compressor is running???, could this be a refrigerant problem with the heat pump? Unfortunately I have to go away for 24 hrs now so turning it off and resting my brain.

Ah, yes it does (brain freeze, your diagram is opposite to my setup, I.e. my heating is on the right and DHW on the left). That seems counter intuitive as I would have thought heating would be on longer than DHW so 3 way valve would be energised for shorter periods. That will teach me to make assumptions.

No. Thanks Gav, your diagram shows powering the diverter valve means hot water to DHW. Still trying to work out what’s wrong?