Air Con at night does what it wants

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  #1  
Old 05-22-19, 01:37 AM
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Air Con at night does what it wants

Hi Guys;
i have Fujitsu 2 part aircon system 10kw. i have factory reset, it is set to cool and max fan 20 degrees...in a server room. The room is a constant 22-23 degrees (alot of servers). however the air con random must stop working when it feels like it during the night.

I have installed a 24 hour monitoring temp...for you to see the not so patterns over a 24 hour period over a few days. Any advice well come please it has me stumped, we've had it serviced and the engineers dont know either.
 
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Old 05-22-19, 02:32 AM
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Any chance the unit is freezing up on you?
 
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Old 05-22-19, 05:27 PM
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It appears to be happening when the sun is down.

The outside temperature is very important as the condenser may have low outdoor temperature protection.

I had a small workshop that I required A/C in even when it was fairly cool outside. I added a high pressure switch to my split unit and had the condenser fan cycle to maintain a higher head pressure for low temperature stability.
 
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Old 05-23-19, 12:47 AM
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I was thinking it was freezing up however during the winter it has been fine; just only started about a month ago. its like something has changed in it.....really annoying... thanks for the ideas any more welcome...
 
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Old 05-23-19, 09:29 AM
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You said it's been serviced.... I'm wondering if they checked the charge.
Low on refrigerant could cause that problem.
 
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