| Document type | Service Information Letter |
|---|---|
| Document number | SI0602 |
| Equipment | YVAA Variable Speed Drive Screw Chiller |
| Brand | YORK |
| File size | 0.2 MB |
Fault codes in this document
Improved clamped voltage design for digital suction pressure transducers
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| sensor failure fault | Suction pressure transducer output voltage value below 0.3 V and above 4.7 V results in a sensor failure fault on the impacted system on the chiller, which inhibits the operation of that system. Observed on chillers in high ambient climate locations when the chiller was in standby mode; this prevented the system(s) from startup. | The voltage output of the impacted suction pressure transducers (P/N: 025-29583-002, digital type, identified by the 2D matrix barcode stamped on the side of the transducer) was unregulated and could reach up to 4.9 V. These transducers were released to production in January 2021; transducers prior to this date are not impacted by this issue. | Verify the manufacturing date for the digital pressure transducer (identified by 2D barcode) to determine if it has unclamped output voltage and needs to be replaced. The last 3 digits of the serial number depict the code for week and year of manufacturing. If the transducer was manufactured between January 2021 and week 10 of 2022 (date code: 102), replace the transducer with a new part — an improved version of the suction pressure transducer that clamps the maximum output voltage at 4.7 V, thereby preventing the sensor failure fault from occurring during these high ambient conditions. | 1 |
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