McQuay WSC Operating Manual page 60

Alarms
When an alarm occurs, the alarm type, limit value (if any), date, and time are stored in the active
alarm buffer corresponding to that alarm (viewed on the Active Alarm screen) and also in the
alarm history buffer (viewed on the Alarm History screen). The active alarm buffers hold a record
of the last occurrence of each alarm and whether or not it has been cleared. The alarm can be
cleared by pressing the Edit key. A separate buffer is available for each alarm (High Cond
Pressure, Evaporator Freeze Protect, etc.). The alarm history buffer holds a chronological account
of the last 50 alarms of any type.
Security
Entering on the Unit Controller
Two four-digit passwords provide OPERATOR and MANAGER levels of access to changeable
parameters. Either password can be entered using the SET PASSWORD screen which can be
accessed either through the SET OTHER menu or by simply pressing the ENTER key while on
one of the SET screens. The password can then be entered by
1. Press the ENTER key.
2. Move to each number space to be changed with the right or left button.
3. Enter the correct value by scrolling with the UP and DOWN arrow keys. The password is
right justified on the controller screen. The operator password would look like 00100, the
manager password would be 02001.
4. Press ENTER again to enter the password
Once the correct password has been entered, the previously selected screen will reappear. Once a
password has been entered, it will remain valid for 15 minutes after the last key-press. Parameters
and screens that require the MANAGER password will not be displayed unless the MANAGER
password is active.
Entering on the OITS
When a password is required, the touch screen will automatically go to the screen keyboard.
Numbers are left justified and the operator password would be 100 (appearing as *** in the
window). See page 24 for further information.
60 OM Centrif Micro ΙΙ-5