szbo_tomas
25-05-2005, 11:38 AM
Have the following problem
air cooled water chiller with r22 refrigerant, compressor is two stages 50 & 100%, two condenser fans set to start due to cond press as follow:
first fan on@12 bar, off@14bar
second fan on@19bar,off@14bar
when second fan start at cond press 19 bar and evap press 4 bar, immediately cond and evap press drop , evap press to 2 bar and cond press drop below 14 bar so after short time the fan stop, and both press for evap and cond goes up again, then fan is on again and so so
second fan is keeping turning on and off, and pressure for both cond and evap change widely up and down
superheat is high especially when comp is 100%, it reach 13 C
subcool is 9 C, and sight class is full
disch temp is 90 C
when copm goes to 50% superheat is good
I tried to open TXV very widly but no change on supht
I removed the sensing bulb from the suction line and wait for result, and problem dissapeared
Should I replace TXV???
Thank you
air cooled water chiller with r22 refrigerant, compressor is two stages 50 & 100%, two condenser fans set to start due to cond press as follow:
first fan on@12 bar, off@14bar
second fan on@19bar,off@14bar
when second fan start at cond press 19 bar and evap press 4 bar, immediately cond and evap press drop , evap press to 2 bar and cond press drop below 14 bar so after short time the fan stop, and both press for evap and cond goes up again, then fan is on again and so so
second fan is keeping turning on and off, and pressure for both cond and evap change widely up and down
superheat is high especially when comp is 100%, it reach 13 C
subcool is 9 C, and sight class is full
disch temp is 90 C
when copm goes to 50% superheat is good
I tried to open TXV very widly but no change on supht
I removed the sensing bulb from the suction line and wait for result, and problem dissapeared
Should I replace TXV???
Thank you