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ameen pasha
12-09-2010, 07:32 AM
respected sir
im a ac technician and now working on daikin air conditioning system that is roof top units with 25 TR capacity ,,,,but what im facing a problem is the suction line getting ice with 45 psi,,,and exactly do not know the parameter of 407c refrigerant please help me out to solve this problem i need the information for actual suction and discharge pressure,,,,please reply fast

nike123
12-09-2010, 07:39 AM
Suction and discharge pressure depend on temperature of air which passing to heat exchangers, their construction, their cleanliness, amount of air, amount of humidity of air, cleanliness of filters, etc....

Go here first:
http://www.refrigeration-engineer.com/forums/showthread.php?t=19701

desA
12-09-2010, 08:18 AM
You may want to download & run Coolpack 1.49.

http://www.ipu.dk/English/IPU-Manufacturing/Refrigeration-and-energy-technology/Downloads/CoolPack.aspx

This will provide property information for R-407c.

casstrig
12-09-2010, 03:24 PM
This is definitely not a normal condition and your suction pressure is too low how low depends on the temperature where the indoor unit is,and you should inspect its condition if the coil is icing up and reducing airflow you have a shortage of gas.I suspect that you have little or no experience with refrigeration as these are basic procedures so I wouldn't bother with the Ph chart first concentrate on the basics.