Daikin RZQ100B8V3B Service Manual page 129

ESIE05-03
3.3.2 General Frequency Control
Outline After the "Starting frequency control" function has been terminated, the ideal compressor frequency
will be determined by the "General frequency control".
General The compressor operation frequency is controlled in order to keep a constant evaporation temperature
in cooling and a constant condensing temperature in heating.
The frequency can be changed every 20 seconds.The maximum frequency change = 2 steps/change.
(= max 6 steps/min)
During abnormal situations (e.g. inverter current protection) the change per step is also =
2 steps/change, but the 20 seconds interval may be decreased, so a quicker change is possible.
Note When other control functions are activated (e.g. discharge pipe control), they can change the
compressor frequency using other inputs than the ones normally being used by the "General
frequency control" function.
In cooling, the target operation frequency will be determined by the indoor ∆t and the evaporating
Cooling
temperature.
∆t cool = Remote controller set temperature - Indoor return air temperature.
Depending on the cooling load, the target evaporating temperature (Te) will be a value between 2°C
≤ Te ≤ 20°C.
In heating, the target operation frequency will be determined by the indoor ∆t and the condensing
Heating
temperature.
∆t heat = Indoor return air temperature - Remote controller set temperature.
Depending on the heating load, the target condensing temperature (Tc) will be a value between 42°C
≤ Tc ≤ 51°C.
Part 2 – Functional Description
Outdoor Unit Functional Concept
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