Evco c-pro nano CHIL Manuale Utente Scaricare il pdf (Pagina 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.

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Evco c-pro nano CHIL Manuale Utente Pagina 122