AC High Pressure Port
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,404
Likes: 418
From: Chester Virginia
AC High Pressure Port
Is it better to have the high pressure port before or after the condenser? My 1973 does not have a high pressure port connection and I am trying to decide to put one on the high pressure hose between the condenser and the VIR or have one welded in the block at the back of the compressor.
Roger
Roger
Pro
Joined: May 2003
Posts: 601
Likes: 0
From: Nottingham
73's a bit different to the CCOT system on the later c3 vettes, my 80's HP port is in the high pressure LIQUID line between the condensor and the evaporator.
As I see it, you would benefit most from being able to measure the hi pressure liquid pressure AFTER the condensor, because it's this pressure that you use to work out the amount of sub-cooling you're getting in the liquid coming out of the condensor, from which you get a handle on the condensor efficiency.. Not really sure how much meaning you get from measuring the high pressure VAPOUR pressure (ie between comp and cond).
As I say, the TXV system is obviously fuctionally differant to the CCOT, but you'd get the condensor sub-cooling measurement in the same way for both... That's all I know, sorry it ain't a definitive answer!
Need someone who (unlike me!) has done a bit more than just working on one type of system - Hopefully noonie will chime in and spread a bit of knowledge...
As I see it, you would benefit most from being able to measure the hi pressure liquid pressure AFTER the condensor, because it's this pressure that you use to work out the amount of sub-cooling you're getting in the liquid coming out of the condensor, from which you get a handle on the condensor efficiency.. Not really sure how much meaning you get from measuring the high pressure VAPOUR pressure (ie between comp and cond).
As I say, the TXV system is obviously fuctionally differant to the CCOT, but you'd get the condensor sub-cooling measurement in the same way for both... That's all I know, sorry it ain't a definitive answer!
Need someone who (unlike me!) has done a bit more than just working on one type of system - Hopefully noonie will chime in and spread a bit of knowledge...
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
Both you guys are right
It really doesn't matter.
Usually it is on the high side at the compressor or near the condenser inlet. Mostly a matter of service accessability.
Bottom line being, whether it's a liquid or a gas it's still going to show the same amount of pressure in a closed system. That doesn't change until after the oriface.
It's probably safer before the condenser, in the rare case that an inexperienced person tries to connect or disconnect with the system running and spews liquid refrigerant all over themselves. Not good.
As far as adding a high service port for a high side cutoff switch, I would prefer it after the condenser.
It really doesn't matter.
Usually it is on the high side at the compressor or near the condenser inlet. Mostly a matter of service accessability.
Bottom line being, whether it's a liquid or a gas it's still going to show the same amount of pressure in a closed system. That doesn't change until after the oriface.
It's probably safer before the condenser, in the rare case that an inexperienced person tries to connect or disconnect with the system running and spews liquid refrigerant all over themselves. Not good.
As far as adding a high service port for a high side cutoff switch, I would prefer it after the condenser.
