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HWE0803A GB
(3) BC controller (cooling only, heating only, cooling main and heating main modes)
Start
Breaker
turned on
Operation
command
Error command to
outdoor unit
Error stop
Self-holding of
protection function
Error command to
indoor unit
Error mode
*Note 1
YES
YES
YES
NO
NO
Fan
NO
All units in the
same mode
Solenoid valves OFF
LEV Fully closed
1.
Determination of operation mode
(Cooling only, Heating only, Mixture
of units in cooling and heating)
2.
Transmitted to the outdoor unit
3
3
Operation
mode
Note 1. The system may go into the error mode on either the indoor unit side or the BC controller or outdoor
unit side. If some of the indoor units are experiencing a problem, only those indoor units that are
experiencing the problem will stop. If the BC controller or the outdoor unit is experiencing a problem,
all the connected units will stop.
Operation
mode
Operation
mode
Cooling Only Heating Only
Cooling Main Heating Main
Mixture of units in cooling and heating
Reception of operation mode
command from the outdoor unit
Protection function
self-holding cancelled.
Normal operation
Error
Unit in the stopped state