SiUS091601EA Control Specification
Part 4 Functions and Control 78
5. Control Specification
5.1 Mode Hierarchy
Outline The air conditioner control has normal operation mode, forced operation mode, and power
transistor test mode for installation and servicing.
Details
Unless specified otherwise, dry operation command is regarded as cooling operation.
5.2 Frequency Control
Outline The compressor frequency is determined according to the difference between the room thermistor
temperature and the target temperature.
Details 1. Determine command frequency
Command frequency is determined in the following order of priority.
(1) Limiting defrost control time
(2) Forced cooling
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 control
Discharging from capacitor
Stop
(R22375)
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 (ΔF<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
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