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YES
NO
YES
NO
YES
YES
NO
NO
Normal operations
Trouble observed
Stop
Start
Breaker
turned on
Set indoor ad-
dress No. to remote
controller
Operation
command
Operation
mode
Error mode
Cooling-only, Heating-only,
Cooling/heating mixed
Error stop
Operation
mode
Operation
mode
52C ON
[3] Operation Flow Chart
(1) Outdoor unit
Note : 1 For about 3 minutes after turning on power source, address and group information of outdoor unit, BC, controller indoor unit,
and remote controller are retrieved by remote controller, during which “HO” blinks on and off on remote controller. In case
indoor unit is not grouped to remote controller, “HO” display on remote controller continues blinking even after 3 minutes after
turning on power source.
Note : 2 Two trouble modes included indoor unit side trouble, (BC controller trouble) and outdoor unit side trouble. In the case of indoor
unit side trouble, error stop is observed in outdoor unit only when all the indoor units are in trouble. However, if one or more
indoor units are operating normally, outdoor unit shows only LED display without undergoing stop.
Note : 3 Operation mode conforms to mode command by BC controller.
Note : 4 In case BC controller issues cooling/heating mixed operation mode, outdoor unit decides operation mode of cooling-main
operation or heating-main operation.
Note : 3
Note : 2
Note : 1
Fan
“HO” blinks on the remote
controller
Oil return LEV, fully closed
1. 52C OFF
2. Inverter output 0Hz
3. Outdoor fan Stop
4. All solenoid valve OFF
Cooling (Cooling-
only) operations
Heating (Heating-
only) operations
Cooling-main
operations
Heating-main
operations
Operation mode command to (BC controller) outdoor unit
Error code blinks on the
outdoor controller board
Error command to
BC controller
Error code blinks on the
remote controller
Cooling/heating mixed
Note : 4