How To Remove The Pressure Relief Valve/Manometer/ Air Vent - Mitsubishi Electric EHST20C-VM6HB Service Manual

DISASSEMBLY PROCEDURE
12. How to remove the pressure relief valve / manometer / air
vent (automatic)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
<Manometer>
() Hold the bottom of the manometer cover and disengage 2
claws, and remove the manometer cover from the top panel
by sliding it backward. (Photo 12-1)
(4) Remove the G1/4" nut from the pressure relief valve and
remove the capillary tube from the pressure relief valve.

W hen reinstalling the G1/4" nut, use a new G1/4"
w
gasket. (Photo 12-2)
(5) Remove the manometer assembly from the cylinder unit.
(6) Remove the manometer from the manometer cover while
pressing on the claws. (Photo 12-3)
w Beware not to put strain on the root of the capillary
tube as the capillary tube is easy to break at the root.
(Photo 1-)
<Pressure relief valve>
(3) Remove the field piping from the pressure relief valve.
(4) Remove the G1/4" nut and remove the capillary tube
from the pressure relief valve. (Photo 1-)

W hen reinstalling the G1/4" nut, use a new G1/4"
w
gasket. (Photo 12-2)
(5) Remove the pressure relief valve with a flare joint using
two spanners: the one to hold the flare joint and the other
to turn the flare nut. (Photo 1-)
(6) Remove the pressure relief valve using two spanners:
one to hold the flare joint and the other to turn the
pressure relief valve. (Photo 1-4)
(7) Eliminate locktite on the thread surfaces using remover.
(Photo 1-4)

w
B efore reinstallation, apply locktite over the thread
surface on the pressure relief valve.
 F or more details about the locktite and the remover,
w
refer to Page 84.
Photo 12-4
Pressure relief valve
Threads for application of loctite
<Air vent (automatic)>
(3) Remove the air vent (automatic) using two spanners: one to
hold the flare joint and the other to turn the flare nut.
(Photos 1-)
(4) Remove the air vent with the flare joint. (Photo 12-2)
(5) Remove the flare joint from the air vent. (Photo 12-5)
Photo 12-5
Air vent
OCH531
Photo 12-1
Photo 12-2
Manometer
cover
Capillary tube
Photo 12-3
Flare joint
Flare joint
79
PHOTOS
Pressure
Air vent
relief valve
Gasket (G1/4")
Flare joint
Nut (G1/4")
Flare nut
Capillary tube
Manometer
Manometer
cover
Flare joint
Flare nut
Claw
Root
Claw