40 Installation and maintenance instructions ecoTEC plus 0020244998_04
5. Purge the heating installation. (→ Page 31)
12.16 Checking the pre-charge pressure of the
shift-load cylinder expansion vessel
Note
One check every three years is sufficient.
1. Close the isolation valves on the domestic hot water
system.
2. Close the cold-water isolation valve.
3. Open a hot water tap to depressurise the water circuit.
Close the hot water tap.
4. Unscrew the screw from the cover of the shift-load cyl-
inder.
5. Remove the cover.
◁ The expansion vessel is freely accessible.
6. Unscrew the sealing cap (2) from the expansion vessel
(1).
7. Check whether the pre-charge pressure of the expan-
sion vessel is approx. 0.4 MPa (4 bar). If the pressure is
lower than this, increase it using an air pump until it is
0.4 MPa (4 bar).
8. Screw the sealing cap (2) back onto the expansion ves-
sel.
9. Reinstall the cover.
10. Repressurise the heat generator and the domestic hot
water system.
12.17 Checking the filling pressure of the heating
installation
1. Check the filling pressure of the heating installation, top
it up with heating water, if necessary, and purge it.
2. Fill the heating installation. (→ Page 31)
3. Purge the heating installation. (→ Page 31)
12.18 Checking the quality of the heating water
▶ Check the quality of the heating water: Clarity (clouding),
correct inhibitor and pH value. (→ Page 29)
12.19 Completing inspection and maintenance
work
▶ Start a test operation after the maintenance.
▶ Check the heating mode and, if required, the domestic
hot water generation (if available).
▶
Carry out a gas family check. (→ Page 29)
▶ Check the gas flow pressure. (→ Page 32)
▶ Check and, if required, adjust the CO₂ content and the
CO/CO₂ ratio (air ratio setting). (→ Page 33)
▶ If required, reset the maintenance interval. (→ Page 35)
▶ Install the front casing.
▶ Fill out the relevant Service Record section in the Bench-
mark Checklist.
12.20 Checking the product for leak-tightness
▶ Check that the product is leak-tight. (→ Page 34)
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