CF-13
DUAL, TRIPLE, POKER DC Inverter : 5. Control Functions
Multi Liberty
DC Inverter
5.5.8 Error in the transmission of data sequences along signal line [HKEU X Multi Liberty only]
If the transmission of signals between HKEU X Indoor Unit and the Outdoor Unit does not occur properly for 4
minutes, the air conditioner stops because of a malfunction and normal operation cannot be restored automatically.
The malfunction will be indicated by the corresponding Error Code, on LED display LED of Indoor Unit.
5.5.9 Protection for compressor overcurrent
When compressor current is higher than operation limit value for at least 10 seconds, compressor frequency is
subjected to limitations, as it is shown on the following Tables. In case of stop for the intervention of this protection
function, this will be indicated by a Protection Code, shown on LED display of Indoor Unit (HKEU X Multi Liberty
Models only) or by codified flashing of LED indicators on frontal panel of Indoor Unit (HTFU X, HSFU X, HRBU
X Multi Liberty Models). Besides, the corresponding Protection Code will be shown on 2-digit LED display on
Outdoor Unit’s PCB.
In case of operation in Cooling mode:
Current frequency (Hz)
Current limit (A)
Intervention by control electronics
COOL_F10
ICOOLLMT6
COOL_F9
ICOOLLMT5
COOL_F8
ICOOLLMT4
COOL_F7
ICOOLLMT3
COOL_F6
ICOOLLMT2
COOL_F5
ICOOLLMT1
In case of operation in Heating mode:
HEAT_F12
IHEATLMT8
HEAT_F11
IHEATLMT7
HEAT_F10
IHEATLMT6
HEAT_F9
IHEATLMT5
HEAT_F8
IHEATLMT4
HEAT_F7
IHEATLMT3
HEAT_F6
IHEATLMT2
HEAT_F5
IHEATLMT1
Current frequency (Hz)
Current limit (A)
Intervention by control electronics
If current frequency is lower than “COOL_F4”, frequency will not be subjected to limitations.
If within 10 seconds since the start, compressor current is lower than operation upper limit, (“ICOOL”), the
corresponding Protection Code will be displayed for 30 seconds and system will be stopped. Operation can
restart after 3 minutes have elapsed since the stop occurred.
If current frequency is lower than “HEAT_F4”, frequency will not be subjected to limitations.
If within 10 seconds since the start, compressor current is lower than operation upper limit, (“IHEAT”), the
corresponding Protection Code will be displayed for 30 seconds and system will be stopped. Operation can
restart after 3 minutes have elapsed since the stop occurred.
Frequency reduction down to “COOL_F4” step;
this frequency is kept for 3 minutes.
Then, frequency will be increased by 3-minute
intervals, starting from “COOL_F4” step - based
on the capacity required by system - till
reaching upper limit corresponding to the
required capacity.
Frequency reduction down to “HEAT_F4” step;
this frequency is kept for 3 minutes.
Then, frequency will be increased by 3-minute
intervals, starting from “HEAT_F4” step - based
on the capacity required by system - till
reaching upper limit corresponding to the
required capacity.
