Removal And Replacement Of The Electronic Thermostat - Heatrae Sadia Multipoint ECO 30L H Installation, Operation And Maintenance Manual

9.4 Removal and Replacement of the
Electronic Thermostat
DANGER
The electronic thermostat (iBD) has 240V
~ applied during normal operation. When
handling the thermostat, extreme care should
be taken. During the removal or replacement
of the thermostat ensure that the electical
power is isolated to the water heater.

If an iBD, ribbon cable or the LCD Display are
diagnosed faulty, the iBD, LCD and interconnecting
ribbon cable should all be removed from the water heater
and replaced with spares part number 7718334. If the
faulty parts are under the warranty period, section 11,
page 30, all parts must be returned for investigation
together under this warranty provision.
Removal
Isolate the electrical power to the water heater.
`
Open the cover to the immersion heater housing.
`
Remove the securing screw then release the cover
by carefully inserting a flat bladed screwdriver into
the slots around the cover and gently levering
outwards until the catches release (see Figure 10,
page 25).
Gently remove the thermostats from the immersion
`
heater thermostat pocket by gently pulling them
out of the pocket until the capillary sensor and
thermistor (NTC) are clear of the pocket.
Gently remove the ribbon cable attached to the
`
electronic thermostat (iBD), by pulling the ribbon
cable plug out of the iBD socket.
Wires x 4
Figure 13: iBD Wiring removal
Wires x 2
Ribbon Connector
Gently remove the two power wires from the iBD,
`
(see fig 13).
Gently remove the four wires from the iBD, (see
`
fig 13).
Unscrew the two securing screws that secure the
`
iBD to the casing, (see fig 14 below).
Mounting
Screw
Reset
Button
Mounting
Screw
Figure 14: iBD removal
Replacement
Replacing the iBD is the reverse process of the
`
removal.
Screw the two securing screws to secure the iBD to
`
the casing, (see fig 14).
Fit the four wires to the iBD, see fig 13 opposite,
`
ensuring that each wire is correctly positioned,
each wire is identified with the connection, (refer to
fig 2 page 7, wiring diagram).
Fit the two power wires from the iBD, (see fig
`
13), observing the correct polarity, L (Red) and N
(Black).
Gently fit the ribbon cable to the (iBD), by pushing
`
the ribbon cable plug into the iBD socket, observing
the correct orientation.
Gently fit the thermostats into the immersion heater
`
thermostat pocket by gently pushing them into the
pocket until the capillary sensor and thermistor
(NTC) are at the end of the pocket.
Perform a visual check to ensure all connections
`
are correctly engaged and that there are no loose
connections and that cable routing is tidy.
Ensure that the thermostat wire and the safety cut
`
out capillary are not touching the wires connected
to the immersion heater.
Fit the cover by correctly aligning and then carefully
`
pushing on each of the clip features. Secure with
the securing screw.
When satisfied that everything is correctly
`
connected and positioned, electrical power can be
switched back onto the water heater.
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