The installer had Daikin at my property for almost a full day and both left without finishing the job (see threads 1 & 2) and the Daikin Controller is completely unconfigured apart from the LWT. The controller doesn't even have any menu items to scroll through at the moment so maybe it needs a reset., but regardless, that controller isn't set up to do anything apart from LWT.
The heating system with the boiler used Honeywell evohome and it was great, saved a heap of cash on my very old inefficient boiler. I don't know what the ASHP control design was ever meant to be but the plumbers turned up and had to figure out how to use the Evohome with the Daikin Mono and indeed the Daikin engineer was also scratching his head. None of them have hands on with the evo and i had to change the settings to support HP operation in terms of cycling and run time - however, it is just the cycling and run time of the Grundfos circulation pump that it is controlling rather than the HP itself.
So this is how its operating currently:
1) HR92 Smart TRVs communicate wirelessly to the Evohome controller and call for heating or turn off the demand , I currently have several of this set very high so in effect fully open all the time.
2) Evohome controller wirelessly switched the CH relay, which in turn powers on the Grundfos pump and opens the 2-port valve (I am assuming its opening the valve, i have never witnessed it so it could be permanently open).
3) As the Daikin HP is permanently on a set LWT, the flow switch and temperatures fire up the HP as required. I currently have it on 24/7 anyway in this cold weather (see thread 2)
4) The DHW is not configured, the 2-port valve is not connected electrically so I am manually opening up that port to heat the water and close it when i remember!
5) The mechanical DHW Cylinder stat is not mounted or connected electrically.
6) The evohome cylinder stat is in the cylinder socket so I can at least see the HW temperature for my manual operations.
my thoughts (assuming the installer and Daikin cannot figure it out)
1) The Daikin controller should be able to replace the evohome, albeit I would lose the HR92 TRVs - but I could sell the whole pack for a decent sum.
2) The Daikin controller should be able to operate the DHW zone valve and pump when the DHW schedule/reheat is required.
3) The evohome DHW relay could be connected to the zone valve and pump to at least get flow to the cylinder using the evohome cylinder stat to close and stop those when temperature is reached. The problem is telling the Daikin to increase temperature to heat the hot water.
4) If the evohome stat was used there is no need for the mechanical stat as the ASHP would never reach dangerous temperatures (and pressure).
5) this should have been all designed and worked out before they ever came to site, but hey ho, this is where we are at...
The installer had Daikin at my property for almost a full day and both left without finishing the job (see threads 1 & 2) and the Daikin Controller is completely unconfigured apart from the LWT. The controller doesn't even have any menu items to scroll through at the moment so maybe it needs a reset., but regardless, that controller isn't set up to do anything apart from LWT.
The heating system with the boiler used Honeywell evohome and it was great, saved a heap of cash on my very old inefficient boiler. I don't know what the ASHP control design was ever meant to be but the plumbers turned up and had to figure out how to use the Evohome with the Daikin Mono and indeed the Daikin engineer was also scratching his head. None of them have hands on with the evo and i had to change the settings to support HP operation in terms of cycling and run time - however, it is just the cycling and run time of the Grundfos circulation pump that it is controlling rather than the HP itself.
So this is how its operating currently:
1) HR92 Smart TRVs communicate wirelessly to the Evohome controller and call for heating or turn off the demand , I currently have several of this set very high so in effect fully open all the time.
2) Evohome controller wirelessly switched the CH relay, which in turn powers on the Grundfos pump and opens the 2-port valve (I am assuming its opening the valve, i have never witnessed it so it could be permanently open).
3) As the Daikin HP is permanently on a set LWT, the flow switch and temperatures fire up the HP as required. I currently have it on 24/7 anyway in this cold weather (see thread 2)
4) The DHW is not configured, the 2-port valve is not connected electrically so I am manually opening up that port to heat the water and close it when i remember!
5) The mechanical DHW Cylinder stat is not mounted or connected electrically.
6) The evohome cylinder stat is in the cylinder socket so I can at least see the HW temperature for my manual operations.
my thoughts (assuming the installer and Daikin cannot figure it out)
1) The Daikin controller should be able to replace the evohome, albeit I would lose the HR92 TRVs - but I could sell the whole pack for a decent sum.
2) The Daikin controller should be able to operate the DHW zone valve and pump when the DHW schedule/reheat is required.
3) The evohome DHW relay could be connected to the zone valve and pump to at least get flow to the cylinder using the evohome cylinder stat to close and stop those when temperature is reached. The problem is telling the Daikin to increase temperature to heat the hot water.
4) If the evohome stat was used there is no need for the mechanical stat as the ASHP would never reach dangerous temperatures (and pressure).
5) this should have been all designed and worked out before they ever came to site, but hey ho, this is where we are at...
Hi Saf,
Are you seeking help, or are you going to leave it to your installer and/or Daikin to resolve?
@derek-m I'm trying to get some knowledge so I can converse and challenge the installer rather than them try and fob me off. If the installer hasn't completed the job by 21st Feb (deadline I've set) I will need to seek another MCS engineer to get it through the RHI application, so I need to be fully armed with all aspects of the system. Once upon a time I was a Building Services engineer so I can do the majority of the work myself but at the moment I am hands off as I don't want to touch anything until the installer has thrown in the towel. It has been 25 years since I was in the trade so these domestic ASHP are new to me but I am learning how they work pretty quickly (with yours, google and this forums help).
