How To Remove The Booster Heater - Mitsubishi Electric EHSE-YM9EC Service Manual

DISASSEMBLY PROCEDURE

7. How to remove the booster heater

(1) Remove the front panel. (Refer to Procedure 1.)
(2) D isconnect the booster heater lead wires from the CNBH
and CNBHT connector on the controller board and from
the BHC1 (Lead wire No.1, No.2 and No.3) and BHC2
(Lead wire No.4, No.5 and No.6) contactors respectively.
(Photo 7-1)
(3) S wing the control box to the front. (Refer to Procedure 4.)
Note: D o not mix up the lead wire numbers when
re-connecting the lead wires to the contactors as
the lead wire numbers are different dependent on
the models.
Model
EHSE-YM9EC No.1
ERSE-YM9EC
No.2
No.3
No.4
No.5
No.6
Refer to "6. WIRING DIAGRAM".
(4) Remove the pump valve. (Refer to Procedure 5.)
(5) Remove the flow sensor. (Refer to Procedure 6.)
(6) R emove the elbow joint and the pipe (BH-FS.) by detaching
the different diameter quick connection. (Photo 7-2)
• When reinstalling the different diameter quick connec-
tion, use a new O-ring.
• R efer to page 70 for how to attach and detach the
different diameter quick connection.
(7) Remove the flare nut (Photo 7-2).
(8) R emove the 2 screws that hold the heater stay onto the
back panel. Lift the booster heater slightly and remove
the booster heater with the heater stay from the back
panel. (Photo 7-2 and 7-3)
(9) R emove the 2 screws on the back of the heater stay and
remove the heater stay from the booster heater. (Photo
7-3)
• Reuse the removed heater stay and the heater stay
fixing screws.
Photo 7-3
OCH590B
Lead wire No. Contactor
BHC1-U
BHC1-V
BHC1-W
BHC2-U
BHC2-V
BHC2-W
Screws
Heater stay
PHOTOS
Photo 7-1
Booster heater
Earth leakage
connector (CNBH)
breakers (ECB1)
BHC2
BHC1
Cable straps
Note: The photos shown are of the E*SE-YM9EC model.
Photo 7-2
Back panel
O--ring
Screw
Heater stay
Screw
Pipe
Pump valve
(BH-FS)
62
Control box
Booster heater thermostat
connector (CNBHT)
Flare nut
Elbow joint
Booster
heater
Different
diameter quick
connection
Pipe
(BH-FS)
Same
diameter quick
connection
Flow sensor
Same
diameter quick
connection
O-ring
Different diameter
quick connection