Another 'Cool Energy' heatpumps thread

[alfaTom]

So we're a few months on now and I realise I should really get the pump up and running now we're coming into winter. 

 

What did people do in terms of control cabling for these units? 

 

Ours is a cat6 cable with plugs either end, but I also need to stuff two 5 cores down the conduit to allow the controls for the diverter valve, pump controls plus another signal line for for CH valve & secondary pump. 

 

What sort of conduit fits onto these units? I think it's a 30mm punch-out with a rubber collar on but getting a gland or similar to fit is proving tricky...

[HughF]

If you’re using a ce-ivt 9 or 12evi then the knockout in the casing will take a 25mm flexicon adapter.

 

I used a Belden multi core as I don’t like working with non-stranded cat5e.

 

I used this for the call for heat, temp sensors and the carel pLAN wiring.

[alfaTom]

On 20/10/2025 at 13:30, HughF said:

If you’re using a ce-ivt 9 or 12evi then the knockout in the casing will take a 25mm flexicon adapter.

 

I used a Belden multi core as I don’t like working with non-stranded cat5e.

 

I used this for the call for heat, temp sensors and the carel pLAN wiring.

 

Cheers HughF, I have an ET-10; one of the newer units. Looks like a 30mm knockout now.

Just waiting on the spiral glands to arrive to fit them and some 7core control cable. (No local electrical distributors stock this)

 

Paired it with a Drayton Wiser stat as they do climate so I can use it for heating and cooling in the summer.

Will report back when it's all up and running; I don't think the ET-10 is even on their site yet.

[Dillsue]

7 hours ago, alfaTom said:

 

Cheers HughF, I have an ET-10; one of the newer units. Looks like a 30mm knockout now.

Just waiting on the spiral glands to arrive to fit them and some 7core control cable. (No local electrical distributors stock this)

Double check that 7 cores is enough bearing in mind that 7 core cable is usually 6 core plus earth. You can sleeve the earth if your really stuck but not best practice. 

 

I've just installed a second 7 core cable to pick up some setback signals but should have installed a 12 core cable from the outset!

[alfaTom]

2 hours ago, Dillsue said:

Double check that 7 cores is enough bearing in mind that 7 core cable is usually 6 core plus earth. You can sleeve the earth if your really stuck but not best practice. 

 

I've just installed a second 7 core cable to pick up some setback signals but should have installed a 12 core cable from the outset!

 

The documentation shows a 5 core and 3 core, but they both use the neutral & earth on there so there is duplication. It will be wired into a wiring centre on other side of wall where I can pick up the required cabling out to the pump/valves etc.

 

Good point to call out though. What sort of setback signals are you picking up off the unit? This is the install sheet given to me alongside the wiring schematic:

 

[Dillsue]

9 hours ago, alfaTom said:

 

The documentation shows a 5 core and 3 core, but they both use the neutral & earth on there so there is duplication. It will be wired into a wiring centre on other side of wall where I can pick up the required cabling out to the pump/valves etc.

 

Good point to call out though. What sort of setback signals are you picking up off the unit? This is the install sheet given to me alongside the wiring schematic:

 

My HP isn't a CE pump but has lots of connections/functions that aren't particularly well documented so its an evolving process knowing what I need/want to connect.

 

If CE specify a certain number of cores and there's no other signals that you may want in the future then run with what they suggest. On the other hand if there's other connections/functions that you may want to use in the future then pulling in a larger number of cores is going to make life easier to hook up additional signals in the future 

[Jack_H]

After some help/advice - I've installed a CE-ET10. This has an an external circulation pump which wires into the controller using a PWM connection.

 

Now the pump in question is a DUCA GEX-C Master -

 

https://www.seconrenewables.com/duca-gex-c-master-pump---25-80-130180-8279-p.asp

 

From what I can tell it doesn't seem to be operating in PWM mode - the pump allows me to cycle through the various modes which shouldn't be the case when operating in PWM mode (see excerpt from manual). All LEDs should be lit when in PWM mode, which hasn't been the case since I installed it.

 

I've noticed that I'm not getting a 5 degree delta t as per my current setting (more like 10 degrees), and I'm concerned this might be something to do with flow rate, and that the fact the heat pump isn't modulating the pumps output may have something to do with this.

 

Anyone got any ideas/experienced this issue?

 

Cheers.

 

 

[dpmiller]

the PWM connection is correctly made? It may not go into the mode if it's not seeing the signal...

[Jack_H]

Yep, I've checked and double checked the wiring...

[HughF]

Do you have the manual for the ET-10, I can't find it on the CE website...

[Jack_H]

EcoTech Manual Version 2.1 - R32 EVI R (1).pdf

 

12 minutes ago, HughF said:

Do you have the manual for the ET-10, I can't find it on the CE website...

 

See attached - I find their manuals tend to be light on detail...

[HughF]

Looks like the primary pump is inside the unit... What do you need an external pump for, and where did you intend to get the PWM signal from as there's no terminal for this broken out on the main PCB.

Edited 10 hours ago by HughF

[Jack_H]

On 22/10/2025 at 07:41, alfaTom said:

 

The documentation shows a 5 core and 3 core, but they both use the neutral & earth on there so there is duplication. It will be wired into a wiring centre on other side of wall where I can pick up the required cabling out to the pump/valves etc.

 

Good point to call out though. What sort of setback signals are you picking up off the unit? This is the install sheet given to me alongside the wiring schematic:

 

@HughF see the above diagram from @alfaTom - there's no internal pump, and the PWM connection is one of 5 for the pump (live, earth, neutral, common and pwm)

[HughF]

Got it... yeah that's the exact same terminal strip pinouts as the older invertech units, with the exception that the invertech has an internal pump already wired in.

 

It should 'just work'...

[Jack_H]

1 hour ago, HughF said:

Got it... yeah that's the exact same terminal strip pinouts as the older invertech units, with the exception that the invertech has an internal pump already wired in.

 

It should 'just work'...

I know 😩

[-rick-]

Have you got a multimeter that can detect the PWM signal on the output?

 

Would be good to be able to know whether its a problem with the unit sending the signal or the pump recieving.

[alfaTom]

Just seen this chat ongoing - realised mine is doing the same - just the first LED lit up.

Can you see the pump speed in the readouts on the screen?

I can't remember off top of my head so will have a look tomorrow.