SkyWalker
22-11-2009, 01:17 PM
hi guys, when you are charging a system for the first time, with a TEV and no reicever, what process do you take? on an air conditioning system
after reading garys 101 i beleive it be best to charge to 8k sub cooling max or full sight glass, depends which comes first? if its low ambiant temps this must have an effect on the condensor, lets say ambiant is 5C and design temp is 30C? do you block the condensor to increase head pressure (SCT) if the answer is yes, how much? when should the condensor blockage be removed and what effect will have, lets say we had 8k sub cooling the remove condensor blockage since its low ambiant wont this increase condensor capacity and increase sub cooling even more? cause liquid to back up and increase head pressure?
after we have correct high side (sub-cooling) do you then check low side and adjust tev once close to set point if needed? or maybe you monitor low side before this point?
since the compressor is suction cooled should i monitor superheat at evap outlet or compressor inlet? if its a large run the superheat may be different in these 2 places?
basically im after a basic step by step procedure for charging refrigerant.
i know many people who just charge to a full sight glass, never mind the cond air on temp, they may check superheat but they will check it when the room is no where near set point, i think some sort of step by step procedure to follow would greatly help me and im sure alot of others.
after reading garys 101 i beleive it be best to charge to 8k sub cooling max or full sight glass, depends which comes first? if its low ambiant temps this must have an effect on the condensor, lets say ambiant is 5C and design temp is 30C? do you block the condensor to increase head pressure (SCT) if the answer is yes, how much? when should the condensor blockage be removed and what effect will have, lets say we had 8k sub cooling the remove condensor blockage since its low ambiant wont this increase condensor capacity and increase sub cooling even more? cause liquid to back up and increase head pressure?
after we have correct high side (sub-cooling) do you then check low side and adjust tev once close to set point if needed? or maybe you monitor low side before this point?
since the compressor is suction cooled should i monitor superheat at evap outlet or compressor inlet? if its a large run the superheat may be different in these 2 places?
basically im after a basic step by step procedure for charging refrigerant.
i know many people who just charge to a full sight glass, never mind the cond air on temp, they may check superheat but they will check it when the room is no where near set point, i think some sort of step by step procedure to follow would greatly help me and im sure alot of others.