Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 397

[8-14 HBC Maintenance Instructions (Applicable to main and sub HBCs) ]
4. Turn on DIP SW002-6.
Then, slowly turn the water vent screw of the two water pumps at the lower part inside the HBC. (Maximum of two turns)
*
Water vent screw
(Maximum of two turns)
Water pump (water vent screw position)
Slowly open the strainer inside the HBC (on the maintenance side).
* Note that, if it is opened fast, water may blast out.
Remove the strainer, and clean its inside.
6. Slowly open the strainer on the far side inside the HBC. Remove it in the same way as the other strainer, and clean its inside.
7. Make sure the strainers are re-installed properly.
Flowchart for debris removal operation (Turn on DIP SW002-1.)
Air 1 Intermittent operation of water pump (20 min)
Air 2 Water supply to all indoor units (20 min)
(1) The operation can be forced to stop by turning on DIP SW002-4.
(2) If it is found during any step that air has not been discharged to the desired degree, repeat the air discharge operation from the
beginning.
(3)
discharge operation from the beginning.
3. Final step
001-1 and 001-2
130
- chapter 8
Strainer maintenance
002-6.
The operation is performed to discharge air from the water circuits. [Air1]
Debris in the pipe will accumulate into the strainer by supplying water to
BS_08_L