Potatoman

Unfortunately, it's all radiators

Hi, I would like to fit a 28 mm fill and flush valve to my system, but the valve reduces the bore to about 20mm for about 35mm in length, will this have any effect on the flow/ efficiency of my system. Thanks

Thanks for that, I have a buffer and separate hot water tank, my worries are after flushing the system and refilling I end up with air in the system like the buffer tank,hot water tank or the circulating pump. Would all this trapped air eventually make its way to the automatic bleeding valves.

That's interesting, where did you position it and how did you get to drain/fill the hot water tank.

If I did that idea, how do I get glycol back in the system

Hi, how do you eliminate stubborn air in the heat pump system when you have a single zone system.

Unfortunately not 😔

How do you know what type of glycol you have in the system, and if you can't does it matter.

Could you isolate and drain a radiator then fill with neat glycol

So if you found the glycol in your system was too low, how would you top it up?

Unfortunately, I need to keep an eye on the glycol levels in my system as it is a hybrid system with an oil boiler which comes on at about +5 degrees C, so I am going to need frost protection. At the moment I am using a refractometer and draining a radiator and topping up with glycol, if it needs topping up, Just wondered if there was a better way.

Hi, what's the best way to add glycol to the heat pump system.

Hi, thank you for your reply, to try and answer your questions, The problem I have got is the installer has left me with wiser controls and has told me that these controls will work when in ASHP mode or 3rd party boiler mode, but they don't, the wiser controls do switch the heat pump off and on but when in 3rd party mode do not switch off the oil boiler, so consequently the house gets too warm. Now I know wiser controls are not the best for ASHP but my problem at the moment is to get the 3rd party boiler working correctly and the reason to have a 3rd party boiler is heat pumps are less efficient at minus temperatures.

Thank you for all the interesting replies, can we talk generically, if you wanted to set up a ASHP e.g. LG and a 3rd party boiler to work as they should do how would you set up the heating controls so it maintained a temperature of 21 degrees in the house if you had the choice of WC or Wiser controls, and how would everything work together, Thanks

Hi, the ASHP is an LG 9KW monobloc, all radiator system, the system was left by the installer with Drayton wiser smart radiator valves controlling the heat pump, fixed flow rate, but now all rad valves are set at 23 degrees and weather compensation is operating. The 3rd party boiler is a Worcester 18 /25 oil boiler connected to the ASHP via a cable. As I understand it, when the outside temperature drops below 5 degrees C, which is set via the heat pump controls, the heat pump stops working and sends an electrical signal to the oil boiler to fire up, but when this happens what will control the temperature in the rooms if the heat pump is switched off