Mitsubishi Electric EHPT17X-VM6D Service Manual page 84

DISASSEMBLY PROCEDURE
13. 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 2 tapes. (Photo 13-1)
• The removed tape can be disposed of.
(4) Remove the flare nut using 2 spanners: one to hold the
flare joint and the other to turn the flare nut. (Photo 13-1)
(5) Displace the pipe slightly downward and pull out the
expansion vessel. (Photo 13-1)
(6) Remove the flare joint from the expansion vessel. (Photo
13-2)
• When reinstalling the flare joint, use a new G3/8" gasket.
Note: To avoid dropping of the expansion vessel, hold it by
hand when removing it.
14. How to remove the temperature and pressure (T&P) relief
valve (EHPT20X-MHEDW model)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Swing the control box to the front. (Refer to Procedure 4.)
(3) Remove the field piping from the T&P relief valve.
(4) Detach the quick connection. (Photo 14-1)
• When reinstalling the quick connection, use a new O-ring.
• Refer to Procedure 25 for how to attach and detach the
quick connection.
(5) Remove the T&P relief valve using 2 spanners: one to
hold the T&P joint and the other to turn the T&P relief
valve. (Photo 14-2)
(6) Eliminate loctite on the thread surfaces using remover.
(Photo 14-2)
• Before reinstallation, apply loctite over the thread surface
on the T&P relief valve and install the T&P relief valve
with the T&P joint.
• When reinstalling the T&P relief valve, point the nut to
the bottom as specified. (Photo 14-1)
• For more details about the loctite and the remover, refer
to Page 95.
15. How to remove the air vent (manual)
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the air vent (manual) by turning the air vent
(manual).
OCH714E
All manuals and user guides at all-guides.com
Photo 13-1
Photo 13-2
Photo 14-1
Photo 14-2
Photo 15
84
PHOTOS/FIGURES
Expansion vessel Flare joint
Tapes
T&P relief valve
T&P joint
Threads for application of loctite
Air vent (manual)
Flare nut
Pipe
Flare joint
Gasket (G3/8")
Quick connection
O-ring
T&P relief valve