When the controller is in the normal display state, the button is locked when there is no button
operation for more than 60 seconds. Press any button at this time to unlock.
8.2.4 Control Output
1) Water temperature control
Normal water temperature control can be performed when the controller is turned on.
Heating mode:
When the water tank (inlet water) temperature ≤ set temperature –return difference, heating begins;
When the water tank (inlet water) temperature ≥ the set temperature, the heating is stopped;
Cooling mode:
When the water tank (inlet water) temperature ≥ set temperature + return difference, the cooling
starts;
When the water tank (inlet water) temperature ≤ the set temperature, the cooling stops.
2) Circulating pump control (water circulation heat pump):
When defrosting, water pump is forced to run.
When cooling or heating, it is turned on 10 seconds before the compressor and stops 30 seconds
after the compressor.
Antifreeze mode:
When the controller is powered on, whether heat pump is off or on, when the ambient temperature is
too low, water pump will enter antifreeze mode to prevent the circulation line or the water tank from
freezing. The specific conditions for enabling and disabling the environment for low temperature
antifreeze are as follows:
a. When the ambient temperature is ≤ 35
℉
, and the duration of the circulating water pump is off for
more than 30 minutes, the circulating water pump is forcibly started for 60 seconds;
b. Exit the antifreeze mode when the ambient temperature rises to ≥39
℉
.
c. When the ambient temperature sensor is faulty, it is mandatory to start the circulating water pump
periodically, and run for 60 seconds every 30 minutes.
8.2.5 The Alarm
1) Low pressure fault:
After the compressor running for 5 minutes, if the low pressure switch is detected to be in the off
state for 10 consecutive seconds, the compressor immediately stops running. At this time, the
controller displays the low pressure fault alarm code “04E”. If the low pressure switch is restored,
error code does not occur. If no other protection or locking occurs, the compressor is restarted after 3
minutes.
If low pressure fault protection appears 3 times within 1 hour, the controller will lock the protection.
And the compressor will lock in the shutdown protection state. At this time, only the shutdown and
restarting can unlock the compressor. The low pressure switch is not detected during the defrosting.
2) High pressure failure:
After the compressor is started, if the high pressure switch is detected to be in the off state for 10
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