Just taken over the maintenance of this 2 circuit chiller.
After de-gassing and fixing the leaks on the oil separator heater pockets, renewing the recovered oil and recharging, the machine runs, loads, unloads and cools OK.
However, on shutdown, both circuits alarm on 'oil return problem'.
Looking through the manual,there are 2 levels of oil protection..the internal level switch and the calculated condition
Oil failure protection
The logic of the UCM uses a comparison of the entering oil temperature at the compressor, to the saturated-condenser temperature, to determine if there is an oil line restriction.The differential between the entering oil and the saturated-condenser temperatures is referred to as the oil loss differential setpoint in the service settings menu.
If the entering oil temperature drops 2°C below the saturated-condenser temperature for more than 30 minutes, the circuit will shut down on a CMR diagnostic.
I had the machine running continuously for over 30 minutes at 1 stage and monitored condenser saturated temp and oil return temps which have been within 2K on CT1 so no shut down error, but as soon as I stop the machine/circuit, it alarms.
Circuit 1 oil and condenser sat temps were within 2K but still alarmed on shutdown. CT2 temps were identical but still alarmed.
Oil leaving temp was 50.2C CT1, 53.2C CT2 and returning was 35.6C CT1 and 38.6 CT2.. Sat Condensing temp was 37.6 CT1 and 38.6 CT2.
The manual refers to the oil differential temp setting in Service level 2 but I can't find it.
There is something else strange with the controller. The machine is a 2003 model so it is just 10 years old. In all that time, it only records 21 compressor starts for both CT1 and CT2, and I've added about 10 starts today. Compressor running hours are 93223 hours for CT1 and 93221 for CT2. In 10 years, the maximum hours they could each have run is 87360, providing they ran 24/7/52/10 :-)
Pressing the controller buttons today, looking at sensor readings etc, and the controller has re-booted it'self a few times, so I'm leaning towards a dodgy Adaptive controller?
Any thoughts anyone?
After de-gassing and fixing the leaks on the oil separator heater pockets, renewing the recovered oil and recharging, the machine runs, loads, unloads and cools OK.
However, on shutdown, both circuits alarm on 'oil return problem'.
Looking through the manual,there are 2 levels of oil protection..the internal level switch and the calculated condition
Oil failure protection
The logic of the UCM uses a comparison of the entering oil temperature at the compressor, to the saturated-condenser temperature, to determine if there is an oil line restriction.The differential between the entering oil and the saturated-condenser temperatures is referred to as the oil loss differential setpoint in the service settings menu.
If the entering oil temperature drops 2°C below the saturated-condenser temperature for more than 30 minutes, the circuit will shut down on a CMR diagnostic.
I had the machine running continuously for over 30 minutes at 1 stage and monitored condenser saturated temp and oil return temps which have been within 2K on CT1 so no shut down error, but as soon as I stop the machine/circuit, it alarms.
Circuit 1 oil and condenser sat temps were within 2K but still alarmed on shutdown. CT2 temps were identical but still alarmed.
Oil leaving temp was 50.2C CT1, 53.2C CT2 and returning was 35.6C CT1 and 38.6 CT2.. Sat Condensing temp was 37.6 CT1 and 38.6 CT2.
The manual refers to the oil differential temp setting in Service level 2 but I can't find it.
There is something else strange with the controller. The machine is a 2003 model so it is just 10 years old. In all that time, it only records 21 compressor starts for both CT1 and CT2, and I've added about 10 starts today. Compressor running hours are 93223 hours for CT1 and 93221 for CT2. In 10 years, the maximum hours they could each have run is 87360, providing they ran 24/7/52/10 :-)
Pressing the controller buttons today, looking at sensor readings etc, and the controller has re-booted it'self a few times, so I'm leaning towards a dodgy Adaptive controller?
Any thoughts anyone?