DISASSEMBLY PROCEDURE
PHOTOS
93
Photo 13-1
13. How to remove the temperature and pressure (T&P) relief
valve (EH*T20*-MHCW models)
(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 13-1)
• When reinstalling the quick connection, use a new O-ring.
• Refer to Procedure 23 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 13-2)
(6) Eliminate loctite on the thread surfaces using remover.
(Photo 13-2)
•
Before reinstallation, apply locktite over the thread sur-
face 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 13-1)
• For more details about the loctite and the remover, refer
to Page 101.
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 2 tapes. (Photo 12-1)
• 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 12-1)
(5) Displace the pipe slightly downward and pull out the
expansion vessel. (Photo 12-1)
(6) 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
by hand when removing it.
Photo 12-1
T&P relief valve
14. 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).
Air vent (manual)
Pipe
Flare joint
Flare nut
Expansion vessel
Photo 12-2
Flare joint
Photo 13-2
Gasket (G3/8")
Photo 14
Tapes
Quick connection
O-ring
T&P joint
T&P relief valve
Threads for application of loctite
OCH570C
Summary of Contents for EHPT20X-MHCW
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