Water Pump; Pump Down Operation; Flow Switch - Panasonic WH-UD07CE5-A Service Manual

13.2. Water Pump

13.2.1. Water Pump Control
1. Once the indoor unit is ON, the water pump will be ON immediately and no error judgement for 9 minutes. However, during
this 9 minutes operation, if there is any abnormality cause at outdoor or malfunction, the compressor should be OFF
immediately and restart delay after 3 minutes.
2. The system will start checking on the water flow level after operation start for 9 minutes. If water flow level is detected low
continuously for 1 minute, the water pump and compressor will be OFF permanently and OFF/ON control panel LED will blink
(H62 error occurs).
3. The water pump will remain ON when compressor OFF due to thermostat OFF.

13.3. Pump Down Operation

Purpose
Ensure the pump down operation when relocating or disposing of the unit. The pump down operation will extract all
refrigerant from the piping into the outdoor unit.
1. Make sure the OFF/ON control panel LED is OFF (no operation).
2. Press the Pump Down button to start the pump down operation.
3. No low pressure protection error during pump down operation and 3-way valve will be shift to heating side.
4. Press OFF/ON button to stop the pump down operation.

13.4. Flow Switch

13.4.1. Flow Switch Control
1. The water flow switch serve as an overload protector that shuts down the unit when the water level is detected to be low.
2. Detection is Lo (0V) when there is no water flow, and detection is Hi (5V) when there is water flow.
68