Mitsubishi Electric PUZ-WZ50VAA Service Manual page 89

OPERATING PROCEDURE
10. Removing the air separator
(1) Remove the inlet and outlet water pipe.*1 (See Photo 5-1)
(2) Remove the service panel, top panel and cover panel. (See
Photo 1-1)
(3) Remove the side panel R. (See Photo 5-1, 5-2)
(4) Remove the fasteners of the air separator. *2 (See Photo 10)
(5) Remove the bracket fixing screws (2 for right/ 4×10) (See
Photo 10)
(6) Slide the Air separator and bracket upward to remove the air
separator.
(7) Remove the fastener and elbow joints. *2 (See Photo 10)
*1 Drain water in the outdoor unit before removing the water
piping.
*2 When reinstalling the fastener, use a new O-ring.
11. Removing the pressure relief valve
(1) Remove the inlet and outlet water pipe. *1 (See Photo 5-1)
(2) Remove the service panel, top panel and cover panel. (See
Photo 1-1)
(3) Remove the side panel (R). (See Photo 5-1, 5-2)
(4) Loosen the nut of the pressure relief valve by a spanner (flat
across width: 19mm). (See Photo 11)
(5) Remove the pressure relief valve and the gasket. *2 *3 *4 (See
Photo 11)
*1 Drain water in the outdoor unit before removing the water
piping.
*2 The water may spout if the pressure relief valve is
removed while the water is still inside the plate heat
exchanger.
*3 Tightening torque of the nut: 15 ± 1 N.m.
*4 When reinstalling the G3/8" nut, use a new G3/8"gasket.
*5 When reinstalling the PRV, be sure to install the discharge
direction of the PRV downward. (See photo 11)
If it is installed in the wrong direction, there is a risk of an
explosion due to the refrigerant and water splashing onto
the electrical equipment.
OCH816
PHOTOS/FIGURES
Photo 10
Elbow
joint
Fasteners
Photo 11
Nob
Pressure relief valves
89
Air separator
Fasteners
Elbow
joint
Bracket fixing screws
The discharge direction
is downward
Nuts