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Protection control for risk distribution
Risk diversification on the heat pump means that the unit controller can determine whether the module can
continue to operate based on the state of the protective devices and various sensors. If any given circuit in a
module has stopped due to a protection device activating, one of the other circuits in that module will
automatically operate to initiate the circuit back up operation. In the event of all circuits in a module failing,
any given module in the system will start up in the module back up operation.
DRP bypass valve control
* Available only with single pump system
If you enter header-to-header pressure difference in the module controller, it controls the opening of the
DRP bypass valve according to the load.
*Depending on the system, it may not be possible to implement control with a heat pump pressure
sensor. In such cases it is possible to implement control by entering the differential pressure between
headers into the module controller.
Heater control
* 60HP (Powerful heating type)
By detecting the outside air temperature and by controlling the heater of the drain pan, it prevents
freezing of the drain water.
2. Status display and output signalling functions
Operation status display and signalling
The module controller show the Run/Stop state of the heat pump on the LCD screen. These controllers also
provide the start signal that can be used by an external Run/Stop indicator (close during operation and open
otherwise).
Error display and signalling
The module controller show the error status of the heat pump on the LCD screen. These controllers also
provide the Major - and Minor -error signals that can be used by an external error indicator or buzzer (Closed
contact when an error occurs and open contact for normal operation).
Operation pattern display and signalling
The module controller show the state of the operation pattern on the LCD screen. These controllers also
provide operation pattern signals for external status monitoring.
Operation mode display and signalling
The module controller show the current operation mode (Cooling/Heating/Cooled Thermal Energy
Storage/Heated Thermal Energy Storage) on the LCD screen. The module controller also provides a signal
for external status monitoring. (The group controller can be optionally customized to support operation mode
signalling for each group area.)
Operation capacity display and signalling
The module controller show the operation capacity on the LCD screen. These controllers also provide an
operation capacity indication (0 to 100%) for external status monitoring.
* Under a high outdoor temperature and other conditions, the operating capacity may not become 100% due
to operating current suppression control.
Approximate capacity display and signalling
The module controller and the optional group controller LCD screens show the instantaneous power
capacity estimated from the refrigerant pressure for each circuit, the current for each circuit etc. Both of
these controllers also provide an instantaneous capacity indication for external status monitoring.
