SiBE121135_A Control Specification
Function and Control 112
4. Control Specification
4.1 Mode Hierarchy
Outline Air conditioner control has normal operation mode, forced operation mode, and power transistor
test mode for installation and servicing.
Detail Cooling Only Model
Heat Pump Model
Note: îš„ Unless specified otherwise, a dry operation command is regarded as cooling operation and
a radiant operation command is regarded as heating operation.
îš„ Indoor fan operation cannot be made in multiple indoor units. (A forced fan command is
made during forced cooling operation.)
Determine Operation Mode
The system judges the operation mode command which is set by each room in accordance with
the procedure, and determines the operation mode of the system.
The following procedure is taken when the modes conflict with each other.
∗1. The system follows the mode which is set first. (First-push, first-set)
∗2. For the rooms where the different mode is set, standby mode is activated. (The operation
lamp blinks.)
Air conditioner control mode
Forced operation mode
Forced cooling operation (for pump down operation)
Wiring error check operation
Power transistor test mode
Normal operation mode
Fan
Cooling (includes drying)
Stop (indoor unit: OFF)
Preheating operation
Discharging from capacitor
Stop
(R17811)
Air conditioner control mode
Forced operation mode
Forced cooling operation (for pump down operation)
Forced heating operation
Wiring error check 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
(R17361)
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