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Make sure the gas supply pressure is correct, refer to Gas supply pressure (see
section 8.9.3).
Make sure the CO
2
value is correct, refer to CO
2
value (see section 8.9.4).
11.2 Preparation
Isolate the water heater from the mains (see section 4.3.2) before you start maintenance
tasks.
11.3 Water-side maintenance
To do water side maintenance:
Descale the tank (see section 11.3.1)
Clean the condensate drain (see section 11.3.2)
11.3.1 Descale the tank
To descale and clean the tank:
Decommision the water heater (see section 8.10).
Remove the cover plate (5) on the bottom of the front of the tank.
Remove the isolating material to see the cleaning opening.
Loosen the 6 bolts (4).
Remove the cleaning opening cover (3).
Remove the gasket (2).
Inspect the tank and remove the loose scale deposits and contamination:
Remove the scale and contamination by hand.
If necessary use a descaling agent to remove the scale and contamination.
Contact the supplier of your water heater for advice on what descaling agent to
use.
Replace the gasket.
Close the cleaning opening.
Use a torque wrench to tighten the bolts with a maximal torque of 50 Nm to prevent
damage to the tank
Fill the water heater (see section 8.9.1).
Fig. Cleaning opening
1 2 3 4 5
1. Cleaning opening
2. Gasket
3. Cleaning opening
cover
4. Bolts
5. Magnetic cover
plate
11.3.2 Clean the condensate drain
To clean the condensate drain:
Place a tray or towels under the condensate drain to collect water leakage.
Remove the condense trap (2) at the bottom of the condensate drain (1).
Empty the condense trap and clean it with water.
Make sure that there is no grit or other blockages in the condense trap.
Make sure that there is no grit or other blockages in the condensate drain.
9.
10.
1.
2.
3.
4.
5.
6.
7.
a.
b.
8.
9.
10.
1.
2.
3.
4.
5.
64 Installation, Maintenance and Service part
64


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