Shutdown; Control To The Compressor - Gree EVO Serie Manual De Instrucciones

Unit Control
will be adjusted by the temperature difference in the way that it increases as the temperature difference goes
up and it decreases as the temperature difference goes down. (temperature difference= actual leaving water
temperature-leaving water temperature set point).
2�1�2 Freeze Protection
When it is detected that the leaving water temperature of the plate heat exchanger is lower than the freeze
protection temperature, the compressor will drop its running frequency until it reaches the minimum running
frequency. Then if it is still detected that the leaving water temperature is lower than the freeze protection
temperature, the main unit will stop as per the shutdown frequency but the water pump keeps normal operation.
When it is detected that the leaving water temperature of the plate heat exchanger is equal to or larger than
the freeze protection withdrawing temperature, freeze protection will exit. At this point, once the compressor has
stopped for three minutes and conditions for startup have been satisfied, the compressor will run for cooling.
2�2 Heating
2�2�1 Control to the Compressor
When the unit is controlled by the leaving water temperature, the running frequency of the compressor
will be adjusted by the temperature difference in the way that it increases as the temperature difference goes
up and it decreases as the temperature difference goes down. When the compressor reaches the minimum
frequency but the temperature difference is still quite large, the unit will shut down (temperature difference=
actual leaving water temperature-leaving water temperature set point).
2�2�2 Over-temperature Protection
When the compressor is running and it is detected that the leaving water temperature of the auxiliary
electric heater is higher than the over-temperature protection temperature, the compressor will lower its
frequency to the minimum. Then if it is still detected that the leaving water temperature of the auxiliary electric
heater is higher than the over-temperature protection temperature, all loads except the water pump of the main
unit and the 4-way valve will stop. Over-temperature protection will exit until the leaving water temperature of
the auxiliary electric heater is lower than the over-temperature withdrawing temperature. After that, the unit will
resume normal operation.
2�2�3 Control to the Auxiliary Electric Heater
When the auxiliary electric heater is deactivated through the wired controller, it will never come into
operation. When it is activated, it will run based on the outdoor temperature.
2�3 Shutdown
There are three kinds of shutdown conditions: normal shutdown, shutdown with some error, shutdown for
protection
Shutdown sequence: for normal shutdown, the compressor lowers its frequency firstly to the minimum
value, while for shutdown with some error or for protection, the compressor will stop directly.Then, the electric
expansion valve turns to the maximum opening angle; the fan stops after the compressor has stopped; the
water pump of the main unit stops after the compressor has stopped; the electric expansion valve turns the
maximum opening angle to the fixed opening angle.
During shutdown under the heating mode, the 4-way valve will be powered off after the compressor has
stopped.
For shutdown owing to some error (except the communication error) or protection, the 4-way valve will keep
the power-on status.
For shutdown owing to communication error between the unit and the wired controller, the 4-way valve will
be powered off some timer later.
For shutdown with some error or for protection, the electric expansion valve will keep the maximum opening
angle.
2�4 Control to the Compressor
When the unit is controlled by the leaving water temperature, the output frequency of the compressor is
adjusted by the difference between the actual water temperature and the leaving water temperature set point.
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