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16-10-2013, 04:24 PM #1
how to force an inverter driven A/C split unit to cool deeper
Hi I'd wonder if somebody could help me with the following. On a A/C split unit with a Sanyo inverter rotary compressor (type C-6RZ110H1A) I want to be able to cool the room down to 12°C but I'am limited to 16°C on the remote control. It's for a wine storage... Since on/off units are prohibited in the EU as of Jan. 1st., 2013 we need to buy/install inverter units and inverter units are not autorized to cool lower than 16°C (EU legislation lot.10). Is the inverter signal sent to the compressor a 4-20mA of 0-10V signal? Regards, Staf
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16-10-2013, 06:56 PM #2
Re: how to force an inverter driven A/C split unit to cool deeper
It's controlled through the communications wire between indoor and outdoor then the outdoor unit PCB will control inverter module whilst monitoring for any discrepancies in the feedback circuit - good luckj!
Simpler to fool indoor air probe to give an incorrect reading perhaps. Haven't tried it myself but recall reading about it on here somewhere.
Cheers,
Andy.Health and safety first..........unless I'm in a hurry.
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16-10-2013, 07:09 PM #3
Re: how to force an inverter driven A/C split unit to cool deeper
This is what I was thinking of
http://www.refrigeration-engineer.co...highlight=wine
Cheeky conversion by Mr Bartlett but a fixed speed unit I guess looking at the controller, could be wrong though
Failing that get a cellar cooler!Health and safety first..........unless I'm in a hurry.
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16-10-2013, 07:25 PM #4
Re: how to force an inverter driven A/C split unit to cool deeper
find out the resistance of the air sensor in the controller- and stick a say 4k ohm resister to offset the temp by 4 deg, but the system must be well over sized otherwise its gonna freeze up- typically fins are spaced furthur apart and the fan velocity is increased too
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17-10-2013, 07:31 PM #5
Re: how to force an inverter driven A/C split unit to cool deeper
hmm thanks everybody but I was hoping to read what kind of signal is send to the compressor to control its speed and how I could affect that speed... probably this would create other problems.... oww dear, what am I missing the simple on/off units!
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28-01-2014, 05:15 AM #6
Re: how to force an inverter driven A/C split unit to cool deeper
Hi,
Was just randomly browsing here and found an interesting comment regarding off setting the sensor using a resistor in series? Is it fair to say 1 k ohm resistor will offset 1 degree ??
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28-01-2014, 08:22 PM #7
Re: how to force an inverter driven A/C split unit to cool deeper
if you get a table of resistances chart for the sensor- then most are around 10-2000 ohm so a 1k ohm resistor will off set it by about 0.5-1 deg- the chart will show you more accuratly, this is based on being ptc type- positive temperature co efficient
ntc will have a reverse affect
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28-01-2014, 11:01 PM #8
Re: how to force an inverter driven A/C split unit to cool deeper
OK,
Let me be the stupid person to ask the obvious question...
Why not use a cellar cooler designed to run at those temperatures in the first place???
Last edited by The Viking; 29-01-2014 at 11:26 PM.