Control Specification (09/12 Class) SiUS04-904
36 Function and Control
3. Control Specification (09/12 Class)
3.1 Mode Hierarchy
Outline There are two modes; the mode selected by the user (normal air conditioning mode) and forced
operation mode for installing and servicing.
Detail Modes available are stop, cooling (includes drying), and heating (includes defrosting)
Note: Unless specified otherwise, an indoor dry operation command must be regarded as cooling
operation.
3.2 Frequency Control
Outline Frequency is determined according to the difference between room and set temperature.
The function is explained as follows.
1. How to determine frequency.
2. Frequency command from an indoor unit. The difference between a room temperature and the
temperature set by the remote controller.
3. Frequency command from an indoor unit.
4. Frequency initial setting.
5. PI control.
Air conditioner control mode
Forced operating mode
Forced cooling (for Pump Down Operation)
Normal operating mode
Cooling
Heating
Defrosting
Stop mode (except for cooling/heating modes by indoor command)
Preheat operation
During C (capacitor) is discharging
Stop
(R2829)
Command frequency
Limit frequency
Skip control
Upper limit function
Compressor protection function
Lower limit function
Four-way valve operating compensation, etc. (*)
Initial frequency
PI control
Defrost control (*)
Dropping function
Input current control, etc.
Upper limit frequency
Lower limit frequency
FMIN
Target frequency
Command frequency X repeats when frequency becomes lower
Frequency changes by PI control < repeats when frequency becomes lower
*; only for heat pump model
(R2831)
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