Cleaning The Filter In The Cold Water Inlet; Draining The Product; Checking The Pre-Charge Pressure For The Internal Expansion Vessel; Completing Inspection And Maintenance Work - Vaillant ecoTEC exclusive 843 Installation And Maintenance Instructions Manual

11 Decommissioning

10.5

Cleaning the filter in the cold water inlet

1. Close the cold water stop valve.
2. Drain the product on the hot water side.
3. Unscrew the cap nut (1) and the lock nut (2) from the
product's casing.
4. Tilt the electronics box forward.
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5. Remove the water hammer arrester's casing (3).
6. Unscrew the cap nut (1) underneath the water hammer
arrester.
7. Remove the pipe (2) from the product.
8. Ensure that you do not damage the heat insulation on
the pipe.
9. Rinse the filter under a jet of water, holding it against
the direction of flow.
10. If the filter is damaged or it can no longer be cleaned
sufficiently, you must replace the filter.
11. Refit the pipe.
12. Always use new seals.
13. Retighten the cap nut on the water hammer arrester
and fit the casing.
14. Retighten the cap nuts and the lock nuts on the cold
water inlet.
15. Open the cold water stop valve.
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Installation and maintenance instructions ecoTEC exclusive 0020193968_03
10.6

Draining the product

1. Close the service valves of the product.
2. Start the check programme P.06 (diverter valve mid-
position).
3. Open the drain valves.
4. Make sure that the cap of the automatic air vent on
the internal pump is open so that the product can be
drained fully.
10.7 Checking the pre-charge pressure for the
internal expansion vessel
1. Close the service valves and drain the product.
2. Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Conditions: Pre-charge pressure < 0.075 MPa (0.75 bar)
▶
Ideally, you should top up the expansion vessel with
nitrogen. Otherwise, top it up with air. Ensure that the
drain valve is open when topping up.
3. If water escapes from the valve of the expansion
vessel, you must replace the expansion vessel
(→ Page 29).
4. Fill the heating installation. (→ Page 19)
5. Purge the heating installation. (→ Page 20)
10.8 Completing inspection and maintenance
work
▶
Check the gas flow pressure. (→ Page 21)
▶
Calibrate the heat generator and measure the CO/CO₂
content and the gas flow in heating mode. (→ Page 22)
▶
If required, reset the maintenance interval. (→ Page 30)
▶
Check that the product is leak-tight. (→ Page 23)
▶
Install the front casing.
▶
Fill out the relevant Service Record section in the Bench-
mark Checklist.
11 Decommissioning
11.1

Temporarily decommissioning the product

▶
Press the on/off button.
◁
The display goes out.
▶
Close the gas isolator cock.
▶
For products with hot water generation and products with
a connected domestic hot water cylinder, you must also
close the cold water stop valve.