ReplyWho’s Rack?Originally Posted by faisalfadak
Regular Guest
Rack refrigeration system
How compressors cut in and out in a multi compressor rack refrigeration system ?
Is it working based on superheat?
I am new in refrigeration ,
I noticed on a rack controller 'suction temp. -35°C and discharge temp. 40°C ( that was a freezer )
How can we know the refrigerant charge is enough in a rack system ?
Professional Member*
Who’s Rack?
Regular Guest
Arneg refrigeration system
Compressor controlled by Carel controller.
Suction pressures transducer , liquid line pressure transducer, suction temp sensor are connected with controller
Regular Guest
I assume it's done by a signal from a suction probe.
Which Carel controller do you have? pRack perhaps?
Is there User manual available online for this unit?
Professional Member*
Typically the rack controller is set for a certain suction pressure based on the coldest load. But some are set up to float the suction pressure based on case temps.
Professional Member*
As to your last question, you want to see around 30 to 40 % receiver when everything is working. But don't immediately adjust charge if it isn't! First make sure all controls and valves are operating and set correctly, that gas could be hiding out somewhere else.
Regular Guest
This is the controller is used in the rack
https://img.ikincielim.com/iel_Resim...er/1259540.jpg
Regular Guest
Suction line and compressor body getting frost
Professional Member*
I'm sorry
Regular Guest
Do you have gauges installed to check those pressures and temperatures on a suction line?
Which part of the suction line is frosting? The suction header, or also the pipe before the collector?
Do you have a suction strainer installed?
How many compressors are frosting?
Professional Member
You need to call a professional.
Regular Guest
The rack is constructed with 5 compressors. 2 of them are switched off due to mechanical noise. Others are running with 0.5 - 0.8 bar suction pressure .
It is R22 system
Suction header and compressor suction port is frosting .
What suction pressure i should maintain ?
12 - 15 psig enough ?
Professional Member
See my above post.
You need to know your coldest load to know your sst
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