Specifications

SiUS12-928_A Control Specification
Function and Control 44
3. Control Specification
3.1 Mode Hierarchy
Outline There are two modes; the one is the normal operation mode and the other is the forced operation
mode for installation and providing service.
Detail There are the following modes; stop, cooling (includes drying), heating (includes defrosting)
Note: Unless specified otherwise, dry operation command is regarded as cooling operation. An indoor fan
operation is not used with a multiple indoor unit. A forced fan command to the indoor unit from the
outdoor unit is made during forced operation.
Determine Operation Mode
The system detects 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
Forced heating
Check incorrect wiring
Normal operation mode
Cooling
Heating
Defrosting
Stop mode (except for cooling/heating modes by indoor command)
Preheat operation
During C (capacitor) is discharging
Stop
(R1373)