jonesy_87_
20-05-2015, 08:18 AM
Hi everyone,
I have recently changed jobs and have been looking after a few cool rooms (never had previous refrigeration experience except for when I did my course 8 years ago)
I had a compressor burn out on a R404A unit. I installed a new compressor, new driers, burnout drier, etc etc.
After giving the unit a vacuum I weighed in the same charge as what I originally pulled out.
Once I ran the unit I had a normal looking head pressure but a low suction pressure.
I've ended up adding a touch more gas and had a play with the TXV (winding it out around 1 and a quarter turns) before I had pressures that looked better.
When I left the coolroom it was reaching temperature (set at 3 degrees Celcius) though it felt it is taking a bit longer to reach than before.
My suction pressure at the condenser is 60ish psi (around -5 degrees Celcius). Head pressure is around 250-260psi.
On the Evap I have a 1 degree Celcius suction pipe temperature and a -5 degree saturated suction temperature/pressure.
Does this sound about right for the R404A gurus?
I have a very slight ice build up on the inlet of the Evap and the suction returning is very cold but not sweating.
Air off the fans I was getting less than 2 degrees Celcius.
I am a bit worried about why I had to adjust the TXV and add more refrigerant when I put an identical compressor in it. My concern is maybe the TXV is failing..
Any advice welcomed :)
Cheers
I have recently changed jobs and have been looking after a few cool rooms (never had previous refrigeration experience except for when I did my course 8 years ago)
I had a compressor burn out on a R404A unit. I installed a new compressor, new driers, burnout drier, etc etc.
After giving the unit a vacuum I weighed in the same charge as what I originally pulled out.
Once I ran the unit I had a normal looking head pressure but a low suction pressure.
I've ended up adding a touch more gas and had a play with the TXV (winding it out around 1 and a quarter turns) before I had pressures that looked better.
When I left the coolroom it was reaching temperature (set at 3 degrees Celcius) though it felt it is taking a bit longer to reach than before.
My suction pressure at the condenser is 60ish psi (around -5 degrees Celcius). Head pressure is around 250-260psi.
On the Evap I have a 1 degree Celcius suction pipe temperature and a -5 degree saturated suction temperature/pressure.
Does this sound about right for the R404A gurus?
I have a very slight ice build up on the inlet of the Evap and the suction returning is very cold but not sweating.
Air off the fans I was getting less than 2 degrees Celcius.
I am a bit worried about why I had to adjust the TXV and add more refrigerant when I put an identical compressor in it. My concern is maybe the TXV is failing..
Any advice welcomed :)
Cheers