Dear all,

I need some advise regarding problem I have encountered this week


Water chiller
YORK INTERNATIONAL LTD
MODEL: YCA J87 SU7G Si 50174
SERIJA: No 14041
Year of manufacture: 1997.

Consist of 2 indipendent refrigeration circuits, refrigerant R22, TEX valves,
1 st compressor 8 cylinders YORK JH 833-S50 46S (no GGER 014 969) P=93 KW
malufuncioned
+
2 nd compressor BITZER 8FC 70.2 with 2 pcs of capacity regulators 100%, 75%, 50%, 0% working.



DIP SWITCH
X□1
X□2
□X3
OPEN X□4
□X5
X□6
□X7
□X8

X – CLOSE



HISTORY of alarm is as follows
HISTORY
SYS 2 COMP ON
SYS 2 MOTOR AMP 66 AMPS
OIL TEMP 57
SYS 2 4,67 BAR SUCTION
SYS 2 15,14 BAR DISCHARGE
SYS 2 OIL PRESSURE 2,86
SYS 2 LIQ LINE ON
SYS 2 RUN PERMISIVE ON
SYS 2 LOADING STAGES 3
SYS 2 COND FANS 1
WORK TIME 2 MIN 6 SEC
PES EQ VALVE
LWT 20.8 °C
LOW WATER CUTOUT 2,2 °C

SET POINT TEMP 4 °C
LOW AMB CUT OUT – 3.9 °C
LOW PRESSURE CUTOUT 3.1
LEAD SYSTEM 2
LOCAL REMOTE SETINGS REMOTE
COOLING RANGE 4,0 TO 5,1

we succeed to force Bitzer compressor to work 50% of capacity, and then we don't have problem with this LWT protection. It looks that it can't work when temperature difference between LWT and set point is too high.

We also succeed to put it operate when we put LWT probe in bottle of cold water 6 *c, problem is that LWT probe is also and antifrost probe!

Is it possible to change some parameters of factory set values condensation temp, condensation band etc?

Any ideas.
Thanks in advance...