water cooled condenser

[newbie223]

I am a little weak on water cooler condensing unit and need help from the pros. I got a service call on a water cooled condenser, AC unit. It is cutting off in just a minute of running time. It cuts off at 360 psig. Found out the Penn water regulating valve was bad. I am going to replace the V46AC to a new one. Here are the questions. What is the rule of thumb for the setting? Should the head pressure correspond to a temperature of 20F. above the exhaust temperature of the water?

[primmers]

discharge temp +10*f

[icemeister]

If it's R22, set the regulator to maintain 210 psig (105ºF SDT) as that is the typical design condensing temperature for water-cooled equipment.

[newbie223]

Thanks!

[R12rules]

Make sure your condensor is capable of still extracting the heat from the system.
Water cooled condensors scale up and their ability to transfer heat goes waaaay down.

They need cleaning/ maintenance.


You will look like a hero when you return their system to better operation after a healthy cleaning.

[newbie223]

Thanks everyone! I just started working for USPS and really don't have the time to work with HVAC any more. Except on Sunday, I might do a little service call. But still, I love doing refrigeration works compare to being a mailman. One service call is equivalent to half of my pay check from the gov’t. LOL I should change my Username to Mailman now.

[fick]

Make sure you clean the eliminators on top of the evap condenser. Be carefull as they become brittle with age. If this is a big evap condenser then there will be header on top for the water to spray from and it will have plastic nozzles. You can pop them out with a pair of channel locks to get the scale out. Some times a piece of brazing rod is enough to clear them in place. The nozzles also become realy brittle and it's not something most people keep around so be carefull if you need to remove them.