Cleaning The Condensate Trap; 11.10 Cleaning The Strainer In The Cold Water Inlet; 11.11 Cleaning The Heating Filter; 11.12 Installing The Gas-Air Mixture Unit - Vaillant ecoFIT sustain 825 Installation And Maintenance Instructions Manual

11.9

Cleaning the condensate trap

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1. Unclip the lower section of the condensate trap (1) from
the upper section of the condensate trap (2).
2. Remove the float (3).
3. Flush out the float and lower section of the condensate
trap with water.
4. Fill the lower section of the condensate trap with water
up to 10 mm below the upper edge of the condensate
discharge pipe.
5. Re-insert the float (3).
Note
Check whether the float is present in the
condensate trap.
6. Clip the lower section of the condensate trap (1) into the
upper section of the condensate trap (2).

11.10 Cleaning the strainer in the cold water inlet

1. Close the main cold water supply line.
2. Drain the product on the domestic hot water side.
3. Remove the connector from the connection for the pro-
duct's cold water pipe.
4. Clean the strainer in the cold water inlet without remov-
ing it.
0020230529_04 ecoFIT sustain Installation and maintenance instructions
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Inspection and maintenance 11

11.11 Cleaning the heating filter

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1. Drain the product. (→ Page 28)
2. Remove the temperature sensor (1).
3. Remove the upper clip (2).
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4. Remove the lower clip (3).
5. Remove the flow pipe (4).
6. Remove the heating filter (5) and clean it.
7. Reinstall the components in the reverse order.

11.12 Installing the gas-air mixture unit

1. Install the burner.
2. Install two new burner seals in the burner hood.
3. Install the gas-air mixture unit.
4. Tighten the screws on the gas-air mixture unit.
– Ideally to 7 Nm if a torque spanner is available.
5. Install the flue pipe.
6. Install the air intake pipe.
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