On 01/03/18 15:56, jim wrote:
Tim Watts Wrote in message:
On 01/03/18 11:19, Andrew wrote:

My Ebac homedry has a circuit board with a 555 timer.

Once per hour it operates a solenoid valve in the gas stream
reversing the flow of warm refridgerant through the cooling
coils, so the ice crackles, melts and falls off. It does this
for about 3 mins and then reverts to normal operation.

QED, should work at very low temperatures.

I bought it 2nd hand in 1988, it's been around the world, to
the pacific for 2 years, and back. Still going strong.

You can buy special heating cable that is mains rated.

I wonder if anyone still makes a unit like that?

I'd prefer the safety of a refrigerant unit (based on what Andrew said
earlier) but the purpose is to keep a shed dry so it will get cold.


Define "cold"...
At 0 / minus anything, there is relatively little water vapour in
the outdoor atmosphere, so your "shed based damp" should be
migrating happily outside by itself without the need of a
dehumidifier?



Defined as "works when it needs to work"

Yes, you're quite right - but interestingly my Meaco 20l compressor unit
goes down to 5C (just checked).

That can be slimly beaten by the

https://www.ebac.com/dehumidifiers/p...er-de8421gy-gb

(Ebac was mentioned earlier)

which goes down to 3C - which clearly would do the job as:

a) It doesn't get that cold often;

b) As you rightly say, damp is not a problem at =0C



As I drive mine through a ZWave switch, I can add temperature as a
factor into the switch on programming.