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Thread: Low side liquid charging devices
03-03-2010, 03:17 AM #14
By throttling the gauge manifold, I have always just been able to get a feel for how much liquid/gas I am getting into the suction line/service port. I see no need for these devices. But I do know that was designed to be hooked up to the bottle, and the service hose hooked to it. That allows for a lot of flashing to take place before it gets out of the service gauges/hoses.Bad information is worse than no information at all.
There are three kinds of people in this world. Those who can count and those who can't!
03-03-2010, 10:10 AM #15
If it is an air cooled model, then you MUST monitor the charging at all times. I oopsed one of those years ago and never forgot it.
If it is a refrigerant cooled model, you don't have to worry nearly as much. Think about it. Look at a cut-away drawing of the compressor. Those little droplets of liquid must first make it into the machine, through the entire motor and into the head where the valves are in order to cause any damage.
I've seen low temp compressors with massive floodback and a frostline to the valve plate and no damage was ever done to those machines.
They are very tough to damage by improper charging.
03-03-2010, 08:46 PM #16Professional Member
- Join Date
- Jul 2008
03-03-2010, 09:06 PM #17
A hermetic, recip compressor is refrigerant cooled.
It's a draw.
Rotarys are a different animal.
03-03-2010, 09:11 PM #18
03-03-2010, 09:16 PM #19Professional Member
- Join Date
- Jun 2003
Scrolls are pretty much invincible to direct damage from refrigerant. They are still susceptible to oil washout from long term flooding.
Rotaries are EXTREMELY sensitive to floodback. The suction line is piped directly into the compression chamber and the discharge gas goes into the can. Exactly the opposite of a recip or scroll semihermetic. This is why almost all rotaries come with a built in suction accumulator.
03-03-2010, 11:08 PM #20