Daikin FTK25JVE9 Service Manual page 28

Si04-115
Frequency controlled functions
The following table shows the different functions, which are controlled by decreasing or
increasing the frequency:
Sensor
Function
Thermistor
Low outdoor ambient
outdoor thermistor (R1T)
temperatur
e control
" outdoor
High
pressure temperature
limitation in thermistor
heating (R1T)
" indoor heat
exchanger
thermistor
(R2T)
Freeze-up indoor heat
prevention exchanger
thermistor (R2T)
Peak cut off indoor heat
exchanger
thermistor (R2T)
Main Function
Why? How?
To avoid condensation By setting a
in cooling mode. high frequency
limit.
This control
is not executed when
the unit is in forced
cooling mode or in test
mode.
To control the pressure. By setting a
high frequency
limit.
To prevent the freezing By setting a
up of the indoor unit in high frequency
cooling mode. limit.
To prevent an abnormal By setting a
high temperature on the high frequency
indoor heat exchanger limit.
in heating mode.
Set Reset
T < T
outdoor ambient outdoor ambient
18°C 25°C
" heating mode " compressor stop
" T " timer delay (70 s)
> 16 °C
outdoor
" T
has passed
indoor heat
> 22 °C
exchanger
" compressor on
" during cooling
T
indoor heat exchanger
" 0 °C <
> 8 °C for 2
T seconds
indoor heat
< 8 °C
exchanger
" during heating
T
indoor heat exchanger
" 50 °C <
< 50 °C for 2
T seconds
indoor heat
< 67 °C
exchanger
General Functionality
Malfunction
> —
—
T
indoor heat exchanger
< 0 °C
(result: compressor
stop)
T
indoor heat exchanger
> 67 °C
(result: compressor
stop)
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