Hydrobox unit thermostat ON
Operation mode
changeover
Pump-down
residual
operation
Malfunction/
Standby (Retry)
Malfunction/
Standby (Retry)
After completion of
startup control
Normal operation
• Compressor PI control
• Electronic expansion valve
PI control
• Protection control
in operation
No
No
Hydrobox unit stop or
thermostat OFF
Hydrobox stop or
thermostat off after
completion of defrost
Yes
Defrost IN
conditions are met.
Defrosting operation
Operation
mode
changeover
Operation mode changeover
(after completion of defrost
control)
Operation in
stop mode
Malfunction/Standby (Retry)
Restart standby
(Compressor stop)
Pressure
equalization
prior to startup
Malfunction/
Standby
(Retry)
Startup control
• Cooling startup control
• Heating startup control
(After completion of
startup control)
Hydrobox unit stop or
thermostat OFF
Note:
In the event the unit stops or the
thermostat turns OFF while in
defrosting operation, pump-down
residual operation is performed on
completion of the defrosting
operation.
Cooling
Heating
Hydrobox unit stop
or thermostat OFF
Hydrobox unit
thermostat ON
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