DE DIETRICH KALIKO TWH 200E - TWH 300E - TWH 300EH - Manual (Page 58)

WARNING
Failure to comply with this maintenance rule may cause
deterioration of the DHW tank and the cancellation of the
guarantee.
7.2.6. Descaling
Use a new leak tight seal on the inspection trap.
In hard water regions, it is advisable to ask the fitter to descale the
DHW tank exchanger once a year in order to maintain its level of
performance.
1. Turn off the domestic cold water inlet.
2. Drain the calorifier.
3. Open a hot water tap.
4. Open the valve on the safety unit.
5. Remove the insulation from the inspection hatch.
6. Pull out the DHW sensor.
7. Remove the inspection trap (13 mm spanner).
8. Remove the 2 bulbs from the safety thermostat.
9. Remove the limescale deposited in the tank in the form of sludge
or strips. Keep the limescale on the wall of the tank: it provides
effective protection against corrosion and enhances the insulation
of the DHW tank.
10.Then replace all the parts in reverse order.
Each time it is opened, the lip gasket must be replaced to
guarantee tightness. Place the positioning lug on the
gasket toward the outside of the tank.
11.After each intervention, ensure that the installation is watertight.
The screws retaining the visit trap must be tightened to
6 N·m +1/-0. Use a torque wrench.
7.2.7. Cleaning the condensates discharge duct
Check the cleanliness of the condensates discharge pipe. An
obstruction by dust may cause poor condensates flow or even a risk
of excessive accumulation of water.
DANGER
Risk of the heat pump malfunctioning.
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7. Checking and maintenance TWH 200E TWH 300E TWH 300EH
56 03/02/2014 - 300026515-001-03