Mitsubishi Electric EHST20C-VM6HA Service Manual page 59

DISASSEMBLY PROCEDURE
5. How to remove water pump/ pump valve
<Water pump>
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the CNP1 connector on the controller board
and release the lead wire from the 3 cable clamps and
the 2 cable straps in the control box, and the 3 bands
and the 2 cable straps below the control box, and
disconnect the earth cable in the control box. (Photos 4-1
10-1, 10-2)
(4) Close (OFF) the 2 pump valves and remove the water
pump by removing the two 1-1/2" nuts using two
spanners: one to hold the pump and the other to turn the
individual nuts. (Photo 5-1)
w When either of the pump valve handles is stiff, remove
the individual handles and turn the individual stems 90
degree mainly by using a spanner. (Photo 5-2)
w When reinstalling the 1-1/2" nuts, use new 1-1/2"
gaskets. (Photo 5-4)
w Set 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 front.
<Pump valve>
(5) Remove the pump valves by removing the 1" nuts using
two spanners: one to hold each valve and the other to
turn each 1" nut.
w When reinstalling the 1" nuts, use new 1" gaskets.
(Photo 5-3)
w When either of the pump valve handles is stiff, remove
the individual handles and turn the individual stems 90
degree mainly by using a spanner. (Photo 5-2)
w When reinstalling the pump valves, face the individual
handles to the right-hand side of the valve as
specified.
Note: Skip Steps (2) and (3) above when replacing the pump
valves only.
When replacing both the water pump and the pump
valves, skip Step (4) above.
Photo 5-1
Pump valve
(upper)
Water pump
Pump valve
(lower)
Photo 5-2
Pump valve
(upper)
Photo 5-3
Photo 5-4
59
PHOTOS
Nut (1")
Gasket(1")
Pump valve
handle (upper)
Nut (
Gasket(1-1/2")
Terminal
box
Nut (
Gasket(1-1/2")
Pump valve
handle (lower)
Nut (1")
Gasket(1")
Stem
Gasket (1")
Gasket (1-1/2")
)
1-1/"
)
1-1/"