| Document type | Service Information Letter |
|---|---|
| Document number | SI0256 |
| Equipment | YMC2 Magnetic Bearing Centrifugal Chiller |
| Brand | YORK |
| File size | 0.3 MB |
Fault codes in this document
2 of these messages are explained on a page of their own — cause, what to check, reset — written from this manual:
Expansion I/O – Serial Communication Fault
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| Serial Communication Fault | Loss of serial communications with the Expansion I/O LTC I/O Board. In this software version the fault includes a timeout (previously it did not). | Communications from the LTC I/O Board are NOT received for 3 consecutive attempts with a 2 second timeout between attempts; the fault occurs if communications is NOT established within 6 seconds of the first attempt. | The fault is released automatically when a valid response is received from the LTC I/O Board. | 1 |
Condenser and Evaporator Flow Faults
| Code / display | Meaning | Cause | Action | Page |
|---|---|---|---|---|
| CONDENSER – FLOW SWITCH OPEN | Cycling fault. In this software version this Standard Soft Shutdown fault has been changed to a Fast Soft Shutdown. | Set when the Condenser Flow Switch is open for 5 seconds when either the Chiller State is Running or the Chiller State is Soft Shutdown. | The fault will be released when the Condenser Flow Switch closes, or when the Run Permissive is False and the Chiller State is Stopped. | 2 |
| CHILLED LIQUID – FLOW SWITCH OPEN | Cycling fault. In this software version this Standard Soft Shutdown fault has been changed to a Fast Soft Shutdown. | Set when the Chilled Liquid Flow Switch is open for 5 seconds when any of the following are true: the Chiller State is Running; the Chiller State is Soft Shutdown; the Chiller State is MBC Startup and the time in the MBC Startup State is greater than 45 seconds. | The fault will be released when the Chilled Liquid Flow Switch closes, or when the Run Permissive is False and the Chiller State is Stopped. | 2 |
Every row above cites the page of this document it came from, and each one is re-read against that page by an automatic check before publication. The short table of all YORK YMC2 messages: fault codes.
Manufacturer document, published here as reference material for equipment we supply. The original lives at docs.johnsoncontrols.com. The rights holder may ask us to take it down — we will.