Which is the more powerful pump?

[John.g]

With CC3?
What pump values are you getting?

 

[John.g]

You said in post #1 that the upstairs rads were heating but not downstairs?,
If you have a Y system with a mid position valve then just carry out the basic check that the pump arrow is pointing towards it, also ensure that system is pressurized to 1.3/1.5 bar.
Can you also take pump values with DHW heating only on, then with (eventually) DHW+d/Stairs+U/stairs.

 

[rcpilot]

You said in post #1 that the upstairs rads were heating but not downstairs?,
If you have a Y system with a mid position valve then just carry out the basic check that the pump arrow is pointing towards it, also ensure that system is pressurized to 1.3/1.5 bar.
Can you also take pump values with DHW heating only on, then with (eventually) DHW+d/Stairs+U/stairs.

Hi John, this flaming thing has got me demented, when I put everything back together, filled the system, bled the radiators, then started it up it was showing 24 watts on the pump and I think 0.6m3/h and the towel rads were getting mad hot the big rad downstairs was getting hot, both bedrooms were cold obviously because the lockshields were closed, the entrance rad was still cold, so I turned it off. Today I turned it back on and got the same results, so I started to manually balance the towel rails got them somewhere near the 12 deg difference checked the pump and the wattage had gone down to 15 and the m3/h was showing 0.0, hair now all over the floor.

 

[rcpilot]

Hi John, this flaming thing has got me demented, when I put everything back together, filled the system, bled the radiators, then started it up it was showing 24 watts on the pump and I think 0.6m3/h and the towel rads were getting mad hot the big rad downstairs was getting hot, both bedrooms were cold obviously because the lockshields were closed, the entrance rad was still cold, so I turned it off. Today I turned it back on and got the same results, so I started to manually balance the towel rails got them somewhere near the 12 deg difference checked the pump and the wattage had gone down to 15 and the m3/h was showing 0.0, hair now all over the floor.

Hi John decided to check the pump with the "go remote app" that pump has got a mind of it's own it reset itself from CC to CP so I reset it to CC and operating @ max it went back to showing 24 watts but the flow rate remained @ 0.0m3/h

 

[John.g]

Balancing should be the last thing to do IMO.
Can you just run on DHW and check values as this is practically a short circuit through the cylinder coil where most of the short? run will/should be in 22mm, if there is a balancing gate valve on the coil return, just open it fully.
I would expect to see ~ 34W on CC3.

 

[rcpilot]

Balancing should be the last thing to do IMO.
Can you just run on DHW and check values as this is practically a short circuit through the cylinder coil where most of the short? run will/should be in 22mm, if there is a balancing gate valve on the coil return, just open it fully.
I would expect to see ~ 34W on CC3.

I will call for hot water as the( data term) will allow me to press for one shot hot water the "Y" plan valve should close the heating down and open the hot water circuit up, if that does not work are the Alpha 3 and the Alpha 2 exactly the same apart from the control panel if so Instead of going down the road of taking the Alpha 3 out I could just change the heads and see what that does

 

[rcpilot]

Balancing should be the last thing to do IMO.
Can you just run on DHW and check values as this is practically a short circuit through the cylinder coil where most of the short? run will/should be in 22mm, if there is a balancing gate valve on the coil return, just open it fully.
I would expect to see ~ 34W on CC3.

Hi John I called for hot water and it immediately went up to 34 watts and the flow rate went up to 0.6m3/h

 

[rcpilot]

Hi John I called for hot water and it immediately went up to 34 watts and the flow rate went up to 0.6m3/h

So when the hot water reached it's temperature the "Y" plan valve closed the hot water circuit and opened the rad circuit the wattage went back to 15 flowrate 0.0m3/h, so I opened the lockshield valves on the towel rails and the wattage went back up to 34watts and the flow rate up to 0.6m3/h what would take that to mean?

 

[John.g]

Hi John I called for hot water and it immediately went up to 34 watts and the flow rate went up to 0.6m3/h

That points to something else rather than a pump problem, once the pump reaches max power then it will only display 0.6M3/hr, but it could be pumping 1M3/hr @ 5M or 1.5M3/hr @ 4M and so on depending on pipe/coil friction losses.

 

[John.g]

So when the hot water reached it's temperature the "Y" plan valve closed the hot water circuit and opened the rad circuit the wattage went back to 15 flowrate 0.0m3/h, so I opened the lockshield valves on the towel rails and the wattage went back up to 34watts and the flow rate up to 0.6m3/h what would take that to mean?

It would mean that there is no real restrictions in the upstairs pipe work.
Can you ensure all d/stair rad valves including lockshields are fully open, then shut all upstairs (one valve on each rad will do) then take pump values on d/stairs only.

 

[rcpilot]

It would mean that there is no real restrictions in the upstairs pipe work.
Can you ensure all d/stair rad valves including lockshields are fully open, then shut all upstairs (one valve on each rad will do) then take pump values on d/stairs only.

ok will do

 

[rcpilot]

ok will do

Right opened all the rads downstairs no change, still 34 watts, closed off both bedrooms again no change still 34watts, but as soon as I touched the towel rails the wattage went down to 16 flowrate 0.0m3/h, any suggestions?

 

[rcpilot]

Right opened all the rads downstairs no change, still 34 watts, closed off both bedrooms again no change still 34watts, but as soon as I touched the towel rails the wattage went down to 16 flowrate 0.0m3/h, any suggestions?

the wattage is back up to 22 watts but the flow rate remains at 0.0m3/h

 

[rcpilot]

the wattage is back up to 22 watts but the flow rate remains at 0.0m3/h

Hi john just been looking at the dates I bought the towel rails and the Alpha 3:- bought the rails on the 23/6/2021, I can remember I had problems when I plumbed them in so finished the job (after set backs of one sort or another) 2 months later, bought the Alpha 3 on the 27/4/2022 but that was after we had been away on holiday, so between finishing the rail installs and noticing that the heating was'nt working as well was about 4 months, everything seems to stem from when I put in the towel rails, just wondered if I have done something wrong will have to check to find out but we are going away again in our caravan so probably won't do that until we come back, what do you think? open to suggestions, or a slap on the wrists!

 

[John.g]

Right opened all the rads downstairs no change, still 34 watts, closed off both bedrooms again no change still 34watts, but as soon as I touched the towel rails the wattage went down to 16 flowrate 0.0m3/h, any suggestions?

So, how many rads open d/stairs when all u/stairs rads + towel rads shut off when flow fell to zero??.
If you reopen just one towel rad does the flow increase?
Normally, even if only one rad open fully would expect a flowrate of - 0.3 m3/hrs and a pump power of - 25/26W on CC3.