CF-11
DUAL, TRIPLE, POKER DC Inverter : 5. Control Functions
Multi Liberty
DC Inverter
5.5 Integrated functions of troubleshooting and protection
5.5.1
3-minute delay protection (delayed start of compressor)
It consists in delayed restart of compressor: in case a compressor stop followed by a restart, operation of air
conditioner will restart after 3 minutes have elapsed.
5.5.2
Protection for overtemperature on discharge pipe of compressor
If an increase of temperature value is detected on compressor discharge pipe (T5 sensor), control electronics
intervenes according to the detected value, as it is described in the following.
- If 102°C < T5 < 115°C, compressor frequency is progressively reduced every 2 minutes up to lowest limit of F1
frequency.
- If temperature on compressor discharge pipe is higher than 115°C, and this condition keeps on for at least 10
seconds, compressor is stopped. It can be restarted only when T5 < 90°C.
- If T5 < 90°C, control electronics applies no limit to compressor’s operation frequency.
5.5.3 Protection for too low power supply voltage and frequency on Outdoor Unit
Depending on power supply voltage and frequency on Outdoor Unit, control electronics monitors both values and
may intervene till commanding the eventual stop of Outdoor Unit, according to modes which are shown in the
following diagram.
The parameters of voltage and frequency for the intervention of the protection function have different values according
to every Model of Outdoor Unit. Values of parameters for each Model are listed below thw following diagram.
VOLLIMT1
Voltage
No limit
VOLLIMT2
VOLLIMT3
Stop
VOLFRE2
VOLFRE1
VOLREL1
VOLREL2
VOLREL3
Model HCKU 406 X2
VOLLIMT1 = 220V, VOLLIMT2 = 200V, VOLLIMT3 = 80V
VOLREL1 = 250V, VOLREL2 = 210V, VOLREL3 = 100V VOLFRE1 = 62Hz, VOLFRE2 = 54Hz
Model HCKU 536 X2
VOLLIMT1 = 230V, VOLLIMT2 = 200V, VOLLIMT3 = 120V
VOLREL1 = 260V, VOLREL2 = 210V, VOLREL3 = 135V
VOLFRE1 = 62Hz, VOLFRE2 = 54Hz