Si04-115
General Functionality
Main Function
19
Frequency controlled functions
The following table shows the different functions, which are controlled by decreasing or
increasing the frequency:
Function
Sensor
Thermistor
Why?
How?
Set
Reset
Malfunction
Low
outdoor
temperatur
e control
outdoor ambient
thermistor (R1T)
To avoid condensation
in cooling mode.
This control
is not executed when
the unit is in forced
cooling mode or in test
mode.
By setting a
high frequency
limit.
T
outdoor ambient
<
18°C
T
outdoor ambient
>
25°C
—
High
pressure
limitation in
heating
"
outdoor
temperature
thermistor
(R1T)
"
indoor heat
exchanger
thermistor
(R2T)
To control the pressure. By setting a
high frequency
limit.
"
heating mode
"
T
outdoor
> 16 °C
"
T
indoor heat
exchanger
> 22 °C
"
compressor on
"
compressor stop
"
timer delay (70 s)
has passed
—
Freeze-up
prevention
indoor heat
exchanger
thermistor (R2T)
To prevent the freezing
up of the indoor unit in
cooling mode.
By setting a
high frequency
limit.
"
during cooling
"
0 °C <
T
indoor heat
exchanger
< 8°C
T
indoor heat exchanger
> 8°C for 2
seconds
T
indoor heat exchanger
< 0 °C
(result: compressor
stop)
Peak cut off indoor heat
exchanger
thermistor (R2T)
To prevent an abnormal
high temperature on the
indoor heat exchanger
in heating mode.
By setting a
high frequency
limit.
"
during heating
"
50 °C <
T
indoor heat
exchanger
< 67 °C
T
indoor heat exchanger
< 50 °C for 2
seconds
T
indoor heat exchanger
> 67 °C
(result: compressor
stop)
