Posible TXV problem?

An area where professionals can discuss HVAC /R related issues and topics.

Moderator: juster

Post Reply
Most Valued Contributor
Posts: 278
Joined: Wed Jan 12, 2011 9:10 pm

- Posible TXV problem?

Post by nomadpeo » Fri Jan 14, 2011 9:18 pm

from the title of your post, i'm assuming you do have a txv. you didn't mention it in your actual post. if it is, charge until you have 7 to 10 degrees sub-cooling, then check your superheat. if the coil is starved due to low feed, the superheat will be high. with a txv, if you have properly sub-cooled liquid fed to the valve, the remote sensing bulb will take over and maintain superheat. we need to see the pressures and line temps to diagnose. a failed power cap would result in a total pump down. it may actually pump into a vacuum. if there is some pressure, the problem is a valve not feeding, a restricted inlet screen or possibly a partially restricted liquid line filter (not common, but happens).

Post Reply