What size replacement orifice do I need? After my compressor скачать в хорошем качестве

What size replacement orifice do I need? After my compressor

From https://www.justanswer.com/ythi JustAnswer Customer: What size replacement orifice do I need? JustAnswer Customer: After my compressor unit was flooded during Sandy, it was replaced by the new unit of the same power - 3 ton. JustAnswer Customer: Previously used refrigerant R22 was no longer available, and the system was filled with R407C. JustAnswer Customer: Low side pressure was set to 63 psi. JustAnswer Customer: The high side pressure was observed at around 200 psi, maybe a bit more. JustAnswer Customer: The evaporator temperature observed at around 50-55 degrees - which is too warm. JustAnswer Customer: As a result, the air is not being cooled sufficiently. JustAnswer Customer: If I drop the low side pressure to around 48 psi, about half of evaporator closer to the capillars is at around 37-40 degrees - which is the most optimal temperature. JustAnswer Customer: However, the other half of evaporator is not cold at all - it is at around 55-65 degrees. JustAnswer Customer: If I drop the low side pressure further, the evaporator starts freezing up - greatly reducing the effectiveness of the unit. JustAnswer Customer: I strongly suspect that the size of the orifice in the evaporator unit is not optimal for R407C refrigerant. JustAnswer Customer: I need to know what is the optimal size, more specifically how the existing size of the orifice needs to be changed to achive most optimal performance. JustAnswer Customer: Please advise. JustAnswer Customer: I can take any measurements as I have the gauges and a digital surface thermometer. gotoman for ac: HVAC Technician: Russ here. gotoman for ac: HVAC Technician: Trane Service Manager. gotoman for ac: HVAC Technician: Plenty R 22 is still available. gotoman for ac: HVAC Technician: R407C is not recommended for Air Conditioning system only refrigeration. gotoman for ac: HVAC Technician: If you are not going to use 22 use 421A dir gotoman for ac: HVAC Technician: If you are not going to use R-22 421A is a direct drop. gotoman for ac: HVAC Technician: No problems. gotoman for ac: HVAC Technician: Use it and it works well. gotoman for ac: HVAC Technician: Russ JustAnswer Customer: This is not my choice. JustAnswer Customer: That's what contractor explained, and seems to be the case where I live, Long Island, NY. JustAnswer Customer: So, using other refrigerant is out of the question. JustAnswer Customer: hello there. gotoman for ac: HVAC Technician: Yes I am here what is temp of air coming from grilles. gotoman for ac: HVAC Technician: Russ JustAnswer Customer: 71 gotoman for ac: HVAC Technician: Ok add refrigerant to system. gotoman for ac: HVAC Technician: and check air temp. gotoman for ac: HVAC Technician: The air temp between return and closest supply vent should be 19 to 20 degrees. gotoman for ac: HVAC Technician: Russ JustAnswer Customer: I've done it in the past, and it only gets worse. JustAnswer Customer: The difference is never that big. JustAnswer Customer: The best I observed was around 14 degrees difference. JustAnswer Customer: When the Sun goes down, it does get better. gotoman for ac: HVAC Technician: Need to go .03 smaller on orifice. gotoman for ac: HVAC Technician: Russ JustAnswer Customer: Are you saying I need a smaller orifice? JustAnswer Customer: What is .03 - inches? JustAnswer Customer: At the correct pressure, the refrigerant does not evaporate well and as a result does not produce enough cold. JustAnswer Customer: With smaller orifice, the evaporation process would get even worse, wouldn't it? JustAnswer Customer: So, why would a smaller orifice work better? JustAnswer Customer: I am looking for a clear answer and justification, not just "do this". JustAnswer Customer: I am not a contractor, and don't know all terminology, but I am handy enough to do basic things like measurements, etc. JustAnswer Customer: I can tell contractor to replace the orifice, but it is an expensive and time consuming proposition, and I need to know for sure how the size of the new orifice should be different from the existing one. gotoman for ac: HVAC Technician: Ok can you give me size of unit. gotoman for ac: HVAC Technician: I will get you orifice size. gotoman for ac: HVAC Technician: Easy change to replace orifice about 20 minutes. gotoman for ac: HVAC Technician: Russ gotoman for ac: HVAC Technician: If orifice is too large let too much refrigeraant thru coil. gotoman for ac: HVAC Technician: Does not remove heat and floods back to compressor. gotoman for ac: HVAC Technician: When I say smaller orofice I am not meaning dropping it too much. gotoman for ac: HVAC Technician: Example R-22 3 ton orifice is about .61 410A is .58 . gotoman for ac: HVAC Technician: You need to drop about .03 to.04 . gotoman for ac: HVAC Technician: Your head pressure will be higher sub cooling wll come inot range and you will get cooling.