Specifications

160
(g) Open-phase protection
When the T-phase voltage of the secondary side of 52C is 0V, an abnormal stop will occur and the inspection displays
(Remote controller : E34, indoor unit green LED : Continuous flashing, red LED : OFF, outdoor unit green LED : red
LED : 2 times flash) will appear.
(h) Current safe control
The operation current is automatically controlled.
When the operation current at the converter inlet increases, the frequency is lowered 5 Hz by 5 Hz so that the operation
current does not increase above the set point.
Lower limit frequency: Partial load 35 Hz
1) Retain the operations with Partial load of 35 Hz for 3 minutes, and when it is foud to be the current safe value, stop the
inverter, operate them with Partial load 3minutes later for 3 minutes. When the frequency is below the current safe value,
operate them with full loads of 35 Hz, cancel the frequency control to bring them back to the normal operation.
2) When the decision frequency under the fuzzy control get lower than the current safe frequency during a current safe
control, bring them back to the normal operation. When the current value comes to the current cancel value during
a
current safe control, retain the frequency for 3 minutes, then cancel the frequency control.
(i) Current cut control
This control aims to prevent over current in the converter. When the current increases above the set point, stop the inverte
r
immediately, then let is reset by itself 3 minutes later. After the self-reset, start the inverter with 35 Hz, and increase the
frequency 5 Hz every 3 minutes to let it return to the fuzzy indication frequency. When the current is cut four times in 15
minutes, turn off 52C bring it to an abnomal stop and the inspection displays (Remote controller : E42, indoor unit green
LED : Continuous flashing, red LED : OFF, outdoor green LED : Continuous flashing,and red LED : 1 time flash will
appear.
(j) Protection of power transistor from overheat
When the temperature of the power transistor increases to the set temperature, stop the inverter immediately and let is
reset by itself 3 minutes later. If the power transistor is overheated again within 2 hours, turn off 52C, bring it to an
abnormal stop and the inspection displays (Remote controller : E41, indoor unit green LED : Continuous flashing, red
LED : OFF, outdoor unit green LED : Continuous flashing, red LED : 4 times flash) will appear.
(k) Protection of number of connected indoor units
When the number of connected indoor units exceeds the quantities shown in the table below, they will come to an
abnormal stop, and the inspection displays (Remote controller E43, indoor unit green LED : Continuous flashing, red LED
: OFF, outdoor unit green LED : Continuous flashing, red LED : 7 times flash) will appear.
(l) Frost prevention during cooling
To prevent frost during a cooling operation, check temperature (to be detected with Th
I-R ) of the indoor unit heat exchange
r
and lower the frequency of indoor unit (opening of expansion valve) when the temperature drops below 3°C.
When the heat exchanger temperature is below 2°C for more than 2 minutes, turn off the thermostat and start a fan
operation. If the heat exchanger temperature rises above 16°C after the thermostat is turned off, reset it to a cooling
operation.
But this operation shall not be executed for 10 minutes after the thermostat is turned on.
Also when temperatures of standing units have been below 2°C for an hour in succession, turn off the compressor for 3
minutes.
Number of connected units
FDCP224HKXRE2A
224HKXRE2V
12 units
FDCP280HKXRE2A
280HKXRE2V
16 units