System control Si18-201
110 Main Functions
3.2 Mode Configuration
Air Conditioner
Control Mode
Air conditioner control mode
Determination of
Normal Operation
Mode
The operation mode signal sent from each BP unit is analysed in the following procedure, and
this signal is used to determine the operation mode of the outdoor unit.
The operation mode is determined based on the first button pressed.
The following shows operation mode instructions sent from two BP units.
Operation mode command HA is issued from BP 1, and HB is sent from BP2.
1. When HA = HB: Indoor unit command is used.
2. When HA = Stop and HB = Operation (cooling, dry, heating), or HA = Operation (cooling,
dry, heating) and HB = Stop: Control room command is used.
3. When HA = Operation, HB = Operation and HA
≠
HB: Due to mode batting, the following
operation mode is used.
The first operation mode entered takes precedence. (operation based on first button
pressed)
Note The dry mode is treated as cooling mode, and the two entered modes do not result in mode
batting.
4. The current operation mode (of outdoor unit) is sent to all BP units.
Standby Mode Standby Control at Power ON
Cooling Standby Operation
Heating Standby Operation
Pressure-Equalizing Control
Installation/Servicing Operation
Mode
Pump-Down Operation
Cooling Test Operation
Heating Test Operation
Normal Operation Mode Cooling Mode
Heating Mode
Stop Mode
Malfunction Processing
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