144
14.3 Water Pressure Control
Once the indoor unit is ON, the water pump will be ON immediately and no error judgment for 70 seconds.
However, during this 70 seconds operation, if there is any abnormality cause at outdoor or malfunction, the
compressor should be OFF immediately and restart delay after 3 minutes.
The system will start checking on the water pressure after operation start for 70 seconds. If water pressure is
detected low continuously 300 seconds, the water pump and the compressor will be OFF permanently and
OFF/ON control panel LED will blink (H21 error occurs).
When error happens, the power has to be reset to clear the error.
If there is no error indication, the water pump shall be continuously running.
YES
NO
NO
YES
YES
Pump ON Request
ON Water Pump
Pump ON Time
≥ 70 Sec?
Water Pressure Abnormal
> 300 Sec?
OFF Water Pump
H21 Error Display
at Remote Controller