Mitsubishi Electric EHPT17X-VM6D Service Manual page 81

From the previous page.
DISASSEMBLY PROCEDURE
10. How to remove the plate heat exchanger (P-HEX)
(Refrigerant - Water)
(7) Remove the thermistor (TH2) from the thermistor holder.
(Refer to Procedure 21.)
(8) Remove the manometer with the manometer cover.
(Refer to Procedure 12.)
(9) Loosen the flare nuts for Air vent (automatic) and
pressure relief valve (3 bar), and remove the Air vent
(automatic) and pressure relief valve (3 bar) together
with the flare joints. (Refer to Procedure 12.)
(10) Loosen and remove the flare nut which connects the
expansion vessel. (Photo 13-1)
(11) Loosen and remove the flare nut on booster heater,
then remove the pipe. (over B.H.) (Photo 10-4)
(12) Remove the strainer valve, the water pump and the
pump valve. (Refer to Procedure 5.)
(13) Remove the quick connection on 3-way valve to make
the connection part free. (Photo 6-1 and 6-2)
• When reinstalling the quick connection, use a new
O-ring.
• Refer to Procedure 25 for how to attach and detach
the quick connection.
(14) Remove the booster heater. (Refer to Procedure 8.)
(15) Remove the water coil cover ,the W.C. top cover (Only
E**T**C series) and the pump stay by removing the
screws. (Photo 10-5)
• Reuse these 3 plates and fixing screws.
(16) Pull out the P-HEX.
11. How to remove the pressure sensor
<Only E*ST**D series>
(1) Remove the plate heat exchanger. (Refer to Procedure 10.)
(2) Remove the welded part of the pressure sensor.
Be sure not to burn the pipe cover. (Photo 11.)
Note: The temperature of the pressure sensor must be 100 °C
or below when welding.
OCH714E
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81
PHOTOS/FIGURES
Photo 10-4
Pipe (over B.H.)
Photo 10-5
Screw
Screws
P-HEX
Water coil
cover
Screws
Photo 11
Expansion vessel
Pump
stay
Thermistor <THW2>