Mitsubishi EHST20C-VM2C Service Manual page 95

DISASSEMBLY PROCEDURE
17. How to remove the plate heat exchanger (P-HEX)
<Water - Water>
(1) Remove the front panel (Refer to Procedure 1).
(2) D rain water in the P-HEX (Water-Water) using the drain
cock (Primary circuit) and the drain cock (Sanitary
circuit). (Photo 17-1)
(3) R emove the 2 screws to remove the water coil W cover.
(Photo 17-1)
• Reuse the water coil W cover and the fixing screws.
(4) R emove the 4 G3/4" nuts.
• When reinstalling the nuts, use new G3/4" gaskets.
(5) Remove the P-HEX (Water-Water) and drain cock
(Sanitary circuit). (Photo 17-2)
• W hen reinstalling the drain cock (sanitary circuit), use a
new one.
Photo 17-2
P-HEX (Water-Water)
18. How to remove the water pump (sanitary circuit)
(1) Remove the front panel (Refer to Procedure 1).
(2) Disconnect the CNP4 connector and the earth cable in
the control box. (Photo 4-2)
(3) R elease the water pump lead wire from the 2 cable
clamps and the cable strap in the control box, the 2
cable straps and the 3 bands below the control box.
(Photos 4-1 and 10-1)
(4) R emove the water pump (sanitary circuit) by removing
the two G1" nuts using the 2 spanners, one to hold the
G1" nut and the other to turn the other side of G1" nut.
(Photo 18)
• When reinstalling the G1" nuts, use a new G1" gaskets.
• S et the water pump in the orientation of the arrow
printed on the water pump and in the way that the
terminal box faces to the left. (Photo 18)
• S et the pump speed of the newly installed water pump
to " ". (Photo 18)
OCH570C
Photo 17-1
Nut (G3/4")
Gasket (G3/4")
P-HEX (Water-Water)
(inside)
Drain cock
(Primary circuit)
Drain cock
(Sanitary circuit)
Nut (G3/4")
Gasket (G3/4")
Drain cock
(Sanitary circuit)
Photo 18
Pump
speed:
Flow
direction
Terminal box
95
PHOTOS
Nut (G1")
Gasket (G1")
Water pump
(Sanitary circuit)
Nut (G1")
Gasket (G1")
Screw
Nut
(G3/4")
Gasket
(G3/4")
Water
coil W
cover
Nut
(G3/4")
Gasket
(G3/4")
Screw