How To Remove Water Pump/ Pump Valve - Mitsubishi Electric EHST20C-VM6HB Service Manual

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.)
() Disconnect the CNP1 and CNPWM connector on the
controller board and release the lead wire from the 2
cable clamps and the cable strap in the control box, and
the 3 bands and the fastener below the control box, and
disconnect the earth cable in the control box. (Photos 4-1
10-1, 10-)
(4) Close (OFF) the 2 pump valves and remove the water
pump by removing the two G1-1/2" 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 G1-1/2" nuts, use new G1-1/2"
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 G1" nuts
using two spanners: one to hold each valve and the
other to turn each G1" nut.
w When reinstalling the G1" nuts, use new G1" gaskets.
(Photo 5-)
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.
OCH531
PHOTOS
Photo 5-1
Pump valve
(upper)
Water pump
Pump valve
(lower)
Photo 5-2
Pump valve
(upper)
Photo 5-3
Photo 5-4
7
Nut (G1")
Gasket(G1")
Pump valve
handle (upper)
Nut ( )
G1-1/2"
Gasket (G1-1/2")
Terminal box
Nut ( )
G1-1/2"
Gasket (G1-1/2")
Pump valve
handle (lower)
Nut (G1")
Gasket(G1")
Stem
Gasket
(G1")
Gasket
(G1-1/2")