How To Remove The Booster Heater - Mitsubishi Electric EHSC-VM2B Service Manual

DISASSEMBLY PROCEDURE

7. How to remove the booster heater

(1) Remove the front panel. (Refer to Procedure 1.)
(2) Remove the control box cover. (Refer to Procedure 3.)
(3) Disconnect the booster heater lead wires from the
CNBHT connector on the controller board and from the
BHC1 (Lead wire No.1 and No.2) and BHC2 (Lead wire
No.3 and No.4) contactors respectively. (Photo 7-1)
(4) Swing the control box to the front. (Refer to Procedure 4.)
Note: Do 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 Lead wire No.
EHSC-VM6B No.1
EHSC-VM6EB No.2
EHPX-VM6B No.3
No.4
EHSC-YM9B No.1
EHSC-TM9B No.2
EHSC-YM9EB No.3
EHPX-YM9B No.4
No.5
No.6
EHSC-VM2B No.1
EHPX-VM2B No.2
ERSC-VM2B
Refer to 6. WIRING DIAGRAM
(5) Close (OFF) the pump valve (upper).
(6) Remove the two G1" nuts. (Photo 7-2)
* When reinstalling the G1" nuts, use new G1" gaskets.
(7) Remove the flare nut (Photo 7-2).
(8) Remove the two 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 .
(9) Remove the 2 screws on the back of the heater stay and
remove the heater stay from the booster heater. (Photo
7-3)
(10) Remove the drain cock (primary circuit) from the boost-
er heater. (Photo 7-2)
* Replace the removed drain cock (primary circuit).
The drain cock can not be reused.
OCH532A
Contactor
BHC1-U
BHC1-V
BHC2-U
BHC2-V
BHC1-U
BHC1-V
BHC1-W
BHC2-U
BHC2-V
BHC2-W
BHC1-U
BHC1-V
73
PHOTOS
Photo 7-1
Control box
Cable
clamp
Connector
(CNBHT)
Cable
clamp
Flow switch
connector
(CN2F)
Cable strap
Coated clamp
* The photos shown are of the EHSC-VM6B model.
Photo 7-2
Back panel
Gasket (G1")
Screw
Heater stay
Screw
Gasket (G1")
Photo 7-3
Heater stay
Earth leakage breakers (ECB1)
BHC2
No.4
No.3
No.1 No.2 BHC1
Flare nut
Nut (G1")
Booster
heater
Pump valve
(upper)
Nut (G1")
Drain cock
Screws