Mitsubishi Electric EHST20C-VM6HA Service Manual page 63

DISASSEMBLY PROCEDURE
9. How to remove the thermostat/immersion heater
<Thermostat>
(1) Remove the front panel. (Refer to Procedure 1.)
(2) Peel off the water-proof tapes on the plastic head of the
thermostat in order to reveal the thermostat terminals,
and disconnect the lead wires from the terminals.
(Photo 9-1)
w Use new commercially available water-proof tapes to
cover the terminals again.
(3) Pull out the thermostat.
<Immersion heater>
(4) Remove the tab cover and remove the back nut (1-3/4")
using the tool included with the immersion heater. (Photo
9-2)
(5) Pull out the immersion heater.
w When reinstalling the immersion heater, use a new
1-3/4" gasket.
Note: When replacing the immersion heater only, skip Step (2)
and cut the band shown. (Photo 9-3)
After reinstalling the back nut with the tab cover onto
the tank, insert the immersion heater straight into the
tank through the back nut in order to provide adequate
sealing. Failure to do so may cause water leakage.
Always check for water leakage after installation.
Photo 9-1
Photo 9-2
Tool (*2)
(*2) When the model is the cylinder unit including immersion heater,
the tool is included with the unit. The tool is also included with
the immersion heater of optional parts.
Photo 9-3
Band
63
PHOTOS
tapes
Water-proof
Back nut
(1-3/4")
Lead wires Thermostat/
Immersion heater
Back nut