Mitsubishi Electric EHSD-MED Service Manual page 74

DISASSEMBLY PROCEDURE
11. How to remove the manometer/ pressure relief valve/ air
vent (automatic) (Continued)
<Pressure relief valve (5 bar)>
(3) Remove the right side panel.
(4) Remove the band at the base of the pressure relief valve
(5 bar).
(5) Remove the pressure relief valve with a flare joint using
2 spanners: one to hold the flare joint and the other to
turn the flare nut. (Photo 11-6)
(6) Remove the flare joint from the pressure relief valve
using 2 spanners: one to hold the flare joint and the
other to turn the pressure relief valve. (Photo 11-6)
(7) Eliminate loctite on the thread surfaces using remover.
(Photo 11-6)
• Before reinstallation, apply loctite over the thread
surface on the pressure relief valve.
• For more details about the loctite and the remover,
refer to page 79.
• The outlet for the pressure relief valve (5 bar) should
be open ended and facing the rear panel.
<Air vent (automatic)>
(3) Remove the air vent with a flare joint using 2 spanners:
one to hold the flare joint and the other to turn the flare
nut. (Photo 11-7)
(4) Remove the flare joint from the air vent using 2 spanners:
one to hold the air vent and the other to turn the flare
joint. (Photo 11-8)
Photo 11-8
Air vent
12. How to remove the expansion vessel
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Remove the flare nut using 2 spanners: one to hold the
flare joint and the other to turn the flare nut. (Photo 12-1)
(4) Remove the 2 screws on the metal support.
Note: To avoid dropping of the expansion vessel, hold
the expansion vessel with the metal support by
hand when removing the last screw.
(5) Pull out the metal support. (Photo 12-1)
(6) Pull out the expansion vessel. (Photo 12-1)
(7) Remove the flare joint from the expansion vessel.
(Photo 12-2)
• When reinstalling the flare joint, use a new G3/8" gasket.
Note: To avoid dropping of the expansion vessel, hold it
securely when removing it.
OCH712C
Photo 11-6
Photo 11-7
Flare joint
Photo 12-1
Photo 12-2
74
PHOTOS/ FIGURES
Expansion vessel
Pressure relief valve (5 bar)
Expansion vessel
Metal support
Screws
Expansion vessel
Gasket G3/8"
Flare joint
Band
Flare nut
Air vent
Flare joint
Flare nut
Flare joint
Flare nut