Stulz C2020 User Manual

EN/07.2013/58/66
5. Alarms
Every alarm has an error message on the display. The alarm message is displayed on LCD alternatively (few seconds)
with the standard display.
Press the ESC button for more than 5 seconds to reset the alarm with manual reset.
In the following table the alarm list is shown.
Alarm Reset
Unit
switching off
Unit behaviour Stand-by Notes
A 01. High temperature Automatic No No changes Yes DelayON fan
A02. Low temperature Automatic No No changes Ye s DelayON fan
A03. Max temperature Automatic No No changes Ye s DelayON fan
A04. Antifreeze Automatic No Stop compress Ye s Immediate
A05. Digital humidity Automatic No No changes Ye s Immediate
A06. High humidity Automatic No No changes Ye s DelayON fan
A07. Low humidity Automatic No No changes Ye s DelayON fan
A08. High pressure
Manual by
attempts
No Start Unit 2* Stop compress Ye s DelayON compressor
A09. Low pressure Manual No Start Unit 2* Stop compress Ye s DelayON compressor
A10. Dirty filter Manual No No changes No Only signal
A 11. Air flow Manual No Start Unit 2* Stop compress Ye s DelayON fan
A12. Overload Heaters Manual No Off heaters Ye s Immediate
A13. Overload Compressor Manual No Start Unit 2* Stop compress Ye s Immediate
A14. Overload evaporator fan Manual No Start Unit 2* Stop compress Ye s Immediate
A15. Overload condenser fan Manual No Start Unit 2* Stop evap fan Ye s Immediate
A16. Sensor broken Automatic No See below No Immediate
A 1 7. Fire smoke Manual Ye s Unit Off No Immediate
A18. Power failure Automatic No Off comp / resist No Immediate
A19. Lan Failure Automatic No No changes Ye s Immediate
A20. Intrusion Manual Ye s Unit Off No Delay by user
A21. Voltage out of range Automatic No Stop compress. Off heaters No Delay by user
A22. Evaporator fan blocked Manual No Stop compress. Stop evap fan Ye s Immediate
A23. External enable Automatic No Stop compress Ye s Immediate
A24. Bad working Manual No Stop compress Ye s DelayON compressor
A25.
Freecooling
(Custom 1 and 23)
Automatic No No changes No Immediate
A26.
Level (Custom 3 and
Custom 4)
Automatic No Stop compress Ye s Immediate
A27. Tm out of range Automatic No No changes No DelayON compressor
Unit management in case of sensor failure:
ALARM ACTION
Internal humidity probe broken Stop dehumidification
External humidity probe broken Stop freecooling (if enthalpic control on)
Internal temperature probe broken Both units switched off
External temperature probe broken Stop freecooling
Discharge air temperature broken No changes (anti-freezing alarm disabled)
Condenser temp or pressure probe unit If T ext>15°C, condenser fan speed at 100%, If T ext<15°C, unit switched off

Stulz C2020 Specifications

General

Brand	Stulz
Model	C2020
Category	Controller
Language	English