8.2.7
Descaling the tank
Important
Fit a new leak tight gasket to the inspection hatch.
In hard water regions, you are recommended to ask the installer to
descale the water heater exchanger once a year in order to maintain its
performance levels.
1. Shut off the domestic cold water inlet.
2. Drain the water heater.
3. Remove the insulation from the inspection hatch.
4. Take out the domestic hot water sensor.
5. Remove the inspection hatch (13-mm spanner).
6. Take out the safety thermostat bulb.
7. Remove the limescale deposited in the tank in the form of sludge or
strips. Leave the limescale on the walls of the tank: it provides
effective protection against corrosion and enhances the water heater's
insulation.
8. Then replace all the parts in reverse order.
Important
Each time it is opened, the lip gasket must be replaced to
guarantee tightness. Place the positioning lug on the gasket
towards the outside of the water heater.
9. After each intervention, ensure that the installation is watertight.
Important
The screws for the inspection hatch must be tightened to 6 N·m
+1/-0. Use a torque wrench.
8.2.8
Cleaning the casing
1. Clean the outside of the appliance with a damp cloth and soapy water.
8.2.9
Cleaning the condensate discharge pipe
A dust obstruction may cause poor condensates flow or even a risk of
excessive accumulation of water.
1. Check the cleanliness of the condensate discharge pipe.
Fig.58
M002839-B
8 Maintenance
EN-7602142 - v11 - 24042019
TWH 200 EV
61
