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Kyskoi2013
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Dream heat pump

Postby Kyskoi2013 » Sun Sep 08, 2013 7:32 pm

Hi all,
I've recently bought a 5kw dream heat pump...
Having a bit of a problem with it though.
It happily warms the pond upto the temperature I want it to then cuts out like it should etc however it doesn't seem to cut back in at all when the temp drops!?
Any advise would be much appreciated or a way that I might be able to over come it?
Thanks in advance
Ky

Kevp
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Re: Dream heat pump

Postby Kevp » Sun Sep 08, 2013 8:14 pm

I believe the dream heat pumps need a two degree drop before they cut back in

CheekyTancho
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Re: Dream heat pump

Postby CheekyTancho » Sun Sep 08, 2013 8:46 pm

Can't the low point be set itself? Or differential? So when its say .5 below your desires temp it kicks in?

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efficiencyman
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Re: Dream heat pump

Postby efficiencyman » Sun Sep 08, 2013 9:08 pm

Kevp wrote:I believe the dream heat pumps need a two degree drop before they cut back in

This is to partly avoid rapid cycling of the compressor starting up under high pressure. There are settings in the controller but only a qualified refrigeration engineer should adjust these settings ( with the right gauges service manual & knowledge should attempt this). This can be over come with a separate Digital thermostat wired into the printed circuit board to the terminals marked "ext" as I have done with my hybrid system. The current controller maybe modified in the near future but the older programmer has delay timers, pressure sensors, stat settings etc. as an extra safety/overload measure to prevent problems developing.
The digistat that I am using is under £25 and mentioned yesterday on another thread. A hysteresis/differential setting is needed to prevent rapid cycling of the compressor ( the pressure needs to dissipate before a restart) 4 mins is usually enough.

Kyskoi2013
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Re: Dream heat pump

Postby Kyskoi2013 » Sun Sep 08, 2013 9:22 pm

Thanks for the reply guys...
I set it to 21degrees
I come out to it in the morning and it's then on standby and was down to 17degrees...
So the way forward is an external stat?
Any chance of a link to the right one please?
Thanks again
Ky

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LeeReloCresswell
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Re: Dream heat pump

Postby LeeReloCresswell » Sun Sep 08, 2013 9:32 pm

Send me your email address, I will send you a guide to altering the settings to work well on your pond.

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efficiencyman
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Re: Dream heat pump

Postby efficiencyman » Sun Sep 08, 2013 10:16 pm

Hope this link works if not there are a lot of others on ebay
http://www.ebay.co.uk/itm/181006904049? ... 1436.l2649
You may also need a mounting box for it to fit it in and cover the terminals
Lee, I would like a copy of those instructions please
Hope that it would still be covered under warranty if those settings are altered.

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LeeReloCresswell
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Re: Dream heat pump

Postby LeeReloCresswell » Sun Sep 08, 2013 10:18 pm

Sorry, confusion between dream / crystal.

On the crystal you can alter the temp drop before it fires back up.

Hubie Thompson
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Re: Dream heat pump

Postby Hubie Thompson » Tue Mar 21, 2017 12:15 pm

efficiencyman wrote:Hope this link works if not there are a lot of others on ebay
http://www.ebay.co.uk/itm/181006904049? ... 1436.l2649
You may also need a mounting box for it to fit it in and cover the terminals
Lee, I would like a copy of those instructions please
Hope that it would still be covered under warranty if those settings are altered.



Hi Lee I know this is an old link but I'm considering buying a dream 5kw as well and would be interested in a copy of those settings as well please

Hubie Thompson
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Joined: Tue Mar 21, 2017 12:09 pm

Re: Dream heat pump

Postby Hubie Thompson » Tue Mar 21, 2017 12:17 pm

efficiencyman wrote:Hope this link works if not there are a lot of others on ebay
http://www.ebay.co.uk/itm/181006904049? ... 1436.l2649
You may also need a mounting box for it to fit it in and cover the terminals
Lee, I would like a copy of those instructions please
Hope that it would still be covered under warranty if those settings are altered.



Hi Lee I know this is an old link but I'm considering buying a dream 5kw as well and would be interested in a copy of those settings as well please


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