nzchillers
23-02-2009, 02:40 AM
We have 2 SRC-S-253 screws fitted to a water cooled chiller controlled via a PCoB controller step less control. The compressor are starting loaded even though the unload solenoid is energised in off cycle mode. We have checked and confirmed the operation of the solenoid valves and have even tried to unload the machine by use of a magnet on the un load valve piston. It is estimated both machines have run 20000hrs
We also have a SRC-S-303 which starts unloaded but loads automatically within 20 seconds and also will not unload during running. It is estimated that this machine has also run in excess of 20000hrs
Could this be something as simple as blocked capillaries on the load / unload solenoid pistons or something more serious with leakage's blockages of the slide guides or chambers, i have seen Howdens wear on the slide key and jam
We also have a SRC-S-303 which starts unloaded but loads automatically within 20 seconds and also will not unload during running. It is estimated that this machine has also run in excess of 20000hrs
Could this be something as simple as blocked capillaries on the load / unload solenoid pistons or something more serious with leakage's blockages of the slide guides or chambers, i have seen Howdens wear on the slide key and jam