EVCO c-pro nano CHIL - Manual (Page 122)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 122
6.15 Temperature Alarm Control
6.15.1 Low and high temperature alarm management
According to operating mode, a check is carried out on the exchanger inlet temperature, triggering
an alarm where appropriate.
- In winter operation (heat pump), if the temperature falls below a given threshold for a
settable lapse of time, a “low temperature” alarm is generated: AL01.
- In summer operation (chiller), if the inlet temperature exceeds a given threshold for a
settable lapse of time, a “high temperature” alarm is generated: AL02
Via a configuration parameter, alarms can be set to be display-only alarms, or to stop the machine.
It is also possible to set a temperature-alarm inhibition delay from system start-up, so as to give the
machine a chance to reach full power.
- PA05 = High-temperature alarm set point
- PA06 = Low-temperature alarm set point
- PA07 = Temperature alarm enable delay
- PA08 = Temperature alarm management mode (display-only / machine stop)
- PA09 = Temperature alarm differential
- PA10 = System start-up alarm inhibition time
These alarms are only detected when the machine is switched ON.
6.15.2 Management of primary exchanger efficiency alarm
If this alarm AL03 (and AL13 for Circuit # 2) is enabled (PA25 = 1), a check is made as to whether
the difference between input and outlet temperatures, situated on the primary exchanger, is below a
Primary exchanger difference minimum threshold PA26 for a By-pass time for primary exchanger
efficiency alarm PA27.
This alarm is not managed during defrosting, if probes are in alarm status and this alarm is a
manual-reset alarm.
This alarm is only detected when the machine is switched ON.