ecoTEC plus 937 installation and maintenance manual
62
• Release the spring clamp (
5
) on the storage tank
charging pump casing (
4
). Support the storage tank
charging pump with your other hand to prevent it
from falling out of the chassis.
• Pull the storage tank charging pump out of the chassis
downwards.
• Fit the pipe bracket to the new storage tank charging
pump using new gaskets.
• Fit the new storage tank charging pump in reverse
order and use new gaskets.
• Connect the electrical wires of the pump in reverse
sequence. Check for correct routing of the lines.
• Re-fit the discharge pipe (
1
) and use new gaskets.
• Filling and vent the combi boiler and the shift load
storage tank.
• After completion of the work check the system for gas
leaks and carry out a function test (see Section 7.8).
9.8
Replacing the aqua sensor
3
2
5
4
1
Fig. 9.9 Replacing the aqua sensor
d
Danger!
Before replacing components ensure that the
safety instructions from Section 9.1 are
observed.
• Isolate the unit from the mains as described in
Section 9.1.
• Close the gas isolation valve in the gas supply pipe.
• Close the isolation valves in the hot water system and
drain the water out of the combi boiler and the shift
load storage tank.
• Remove the discharge pipe (
1
) of the heating pressure
relief.
• Separate the electrical wire of the aqua sensor from
the wiring harness by pulling off the plug from the
wiring harness.
• Release the fitting (
2
) and (
3
) on the elbows (
4
)
and (
5
).
• Turn the Aqua-Sensor slightly to the side and pull the
Aqua-Sensor downwards out of the chassis.
• Remove the pipe elbow from the Aqua-Sensor.
• Fit the pipe elbow onto the new Aqua-Sensor and use
new gaskets.
• Mount the new Aqua-Sensor in reverse order and
replace the seals.
• Connect the line plug of the Aqua-Sensors with the
wiring harness.
• Re-fit the discharge pipe (
1
) and use new gaskets.
• Filling and vent the combi boiler and the shift load
storage tank.
• After completion of the work check the system for
water leaks and carry out a function test (see
Section 7.8).
9.9
Replacing the electronics on the shift load
storage tank
1
Fig. 9.10 Replacing electronics
d
Danger!
Before replacing components ensure that the
safety instructions from Section 9.1 are
observed.
9 Replacing components
