Mitsubishi Electric EHST20C-VM2C.UK Service Manual page 67

DISASSEMBLY PROCEDURE
8. How to remove the booster heater
(1) Remove the front panel (Refer to Procedure 1).
(2) Disconnect the CNBHT connector on the controller
board, and the booster heater lead wires wired to the
BHC1 (Lead wire No.1, No.2 and No.3) and BHC2
(Lead wire No.4, No.5 and No.6) contactors respectively
and release the lead wires from the fastener, the cable
clamp, the 2 cable straps, the coated clamp and the 3
bands. (Photos 8-1 and 10-1)
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
EHST20C-VM6C
EHST20C-VM6EC
EHPT20X-VM6C
EHST20C-YM9C
EHST20C-TM9C
EHST20C-YM9EC
EHPT20X-YM9C
EHPT20X-TM9C
EHST20C-VM2C
EHST20C-VM2EC
EHST20D-VM2C
EHPT20X-VM2C
Refer to 6. WIRING DIAGRAM
Quick connection of
inlet of booster heater
OCH570
Lead wire No. Contactor
No.1 BHC1-U
No.2 BHC1-V
No.3 BHC2-U
No.4 BHC2-V
No.1 BHC1-U
No.2 BHC1-V
No.3 BHC1-W
No.4 BHC2-U
No.5 BHC2-V
No.6 BHC2-W
No.1 BHC1-U
No.2 BHC1-V
Photo 8-2
Front frame (L)
Flare nut
Screw
Screws
Booster heater
Heater stay
Screw
Screw
O-ring
Pipe (W.C. - B.H.)
Quick connection
of outlet of P-HEX
O-ring
P-HEX
Pump valve
Photo 8-1
Controller
board
Cable
clamp
CNBHT
Cable
connector
strap
* The photos shown are of the EHST20C-VM6C model.
Pipe (B.H.-D.V.)
Gasket
Nut Nut
(G1") (G1") (G1")
67
PHOTOS
Control box Earth leakage circuit
breaker (ECB1)
Terminal
block (TB1)
Gasket
Band
(G1")
DIV frame
Screws
Cushion
Pipe (to F.S.)
Quick connection
(upper F.S.)
Band and rubber
Continue to the next page.
Contactors