Swimming pools fittings

[SolarCity]

Okay, we're taking a solar heating matting system off the roof of a shed to install solar PV. The current swimming pools heating system doesn't seem to be working correctly and the owner would prefer PV instead. Good call.

Does anyone know anything about these systems? I'm assuming that I can drain the water from the system and simply join the existing feed and return pipes together?

This is the stuff they have currently: Poolsolar swimming pool solar matting heating system

 

[Marvo]

All the heaters I've seen like that have a bypass valve arrangement usually on the wall between the supply pipe and the return pipes.

 

[a1colly]

Yes usually you'll have a buy pass loop installed, however if not you ll find that the existing pipe is of an odd size (escapes my mind what is at this moment) but you can pick up the fittings and pipe form PTS (my last place of purchase) next day delivery.

 

[SolarCity]

Thanks both. The size is inch and half. Presumably these can't just be solvent welded together, right?

 

[a1colly]

Yeah they can but make sure you clean the pipe with a solvent cleaner first.

 

[SolarCity]

Thanks for the info, fellas. Very helpful.

 

[Worcester]

Okay, we're taking a solar heating matting system off the roof of a shed to install solar PV. The current swimming pools heating system doesn't seem to be working correctly and the owner would prefer PV instead. Good call.

Are they going to add in an Air Source Heat Pump? Just work out the COP with A14/W29 Massive Make sure it's properly designed to run a swimming pool c/w the correct heat exchangers (DON'T TOUCH DREAM ) aand with the PV they are on to a winner, - Add in the very latest ImmerSUN II with the latest software and it can even control the heat pump (minm trigger level, mininum on, minimum off - run via a contactor)

 

[Gavin A]

does the immersun control have a minimum on time for the relay to stop the heat pump being switched on and off too frequently?


re the pool, is it direct, or has it got a heat exchanger between the 2 circuits? if the latter then just remove the matting and drain, and leave the exchanger in the circuit for the pool.

 

[SolarCity]

I believe it is direct but I'll take another look.

Regarding the heat pump idea, I'm not sure it'd be worth it. His pool gets very little use.

 

[Worcester]

does the immersun control have a minimum on time for the relay to stop the heat pump being switched on and off too frequently?

Yep it does, and at the end of that period it will then check to see if still sufficient, if so carries on, if importing, then switches off, and won't switch on again until the minumum off times has passed and it is generating sufficient excess.

Just be careful some of the wholesalers may not yet have the units with the latest software version installed, they may still have stocks of the older version. So you may need to pay official trade and buy direct from 4eco.

 

[Gavin A]

interesting, and does it allow you to prioritise the relay, so prioritising the heat pump over the immersion control?

 

[Worcester]

Not considered that, I'll check it out and get back to you. - What application do you have in mind?

 

[Gavin A]

on bigger systems, triggering a contactor to a heat pump circuit when generation is high enough, then proportional controller for immersion to use up excess for hot water, given that heat pump COPs are rubbish for hot water, and the tanks need raising to 65degrees periodically anyway.

 

[SibertSolar]

That's what the peripheral set-point on the Elios4You & Power Reducer is intended for Gavin - let's you give an excess-generation priority to the on-board relay before any is diverted via the PR

 

[Gavin A]

That's what the peripheral set-point on the Elios4You & Power Reducer is intended for Gavin - let's you give an excess-generation priority to the on-board relay before any is diverted via the PR

I know, was just sussing out what the script is with the immersun.

 

[solarfred]

What size pool and where is it? Inside or out. Insulated or not etc. Or did I miss that bit!

 

[Worcester]

Here it is from the manual:

"Export Threshold
The relay will activate when a set export power Threshold is reached. The relay will remain activated a set minimum ON Period. After this period the relay will deactivate, unless the export threshold still exceeds the set level. If the export has fallen below the threshold after the ON Period, the relay will immediately deactivate and will remain so for the set OFF Period. This function operates independent to the heater outputs. The heater outputs will take priority, therefore the available export power will be 'consumed' by the heaters first. "

So it looks as though they can do similar things

We're also just looking at the new Honewell evo link for the DHW (works with vented and unvented ) to see if we can program cylinder stat by time of day so that we can set back the call for heat to the DHW tank until after the immersun has had a chance to heat it up, yet at the same time ensure a minimum at the start of the day of say 35° which is Ok for a quick shower..