MXS Service Manual

SiUS121736EA Control Specification
Functions and Control 92
4.2 Mode Hierarchy
Outline Air conditioner control has normal operation mode, forced operation mode, and power transistor
test mode for installation and servicing.
Details
Note:  Unless specified otherwise, dry operation command is regarded as cooling operation.
 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)
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)