Daikin RXS35K2V1B, Service Manual

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Control Specification SiBE041213E
35 Function and Control
3. Control Specification
3.1 Mode Hierarchy
Outline The air conditioner control has normal operation mode, forced operation mode, and power
transistor test mode for installation and servicing.
Detail
l
Note: Unless specified otherwise, a dry operation command is regarded as cooling operation.
3.2 Frequency Control
Outline Frequency is determined according to the difference between the room thermistor temperature
and the target temperature.
Detail How to Determine Frequency
The compressor’s frequency is determined by taking the following steps.
1. Determine command frequency
Š
Command frequency is determined in the following order of priority.
1.Limiting defrost control time
2.Forced cooling
3.Indoor frequency command
Air conditioner control mode
Forced operation mode
Forced cooling operation (for pump down operation)
Power transistor test mode
Normal operation mode
Fan
Cooling (includes drying)
Heating
Heating
Defrosting
Stop (indoor unit: OFF)
Preheating operation
Discharging from capacitor
Stop
(R17533)
Command frequency Limit frequency
Skip control
Upper limit function
Compressor protection function
Lower limit function
Four way valve operation compensation, etc.
Target frequency
(R18023)
When the shift of the frequency is less than zero (
∆
F<0) by PI control,
the target frequency is used as the command frequency.
Dropping function
Input current control, etc.
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Initial frequency
PI control
Defrost control