Inspection and maintenance 12
0020300876_01 Energy
7
Installation and maintenance instructions 39
12.10 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.
12.11 Draining the product
1. Close the service valves of the product.
2. Start check programme P.05 (→ Page 27).
Check programmes – Overview
3. Open the draining cock.
12.12 Checking the pre-charge pressure of the
expansion vessel
1. Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Condition: Pre-charge pressure < 0.075 MPa (0.75 bar)
▶ Top up the expansion vessel in accordance with the
static height of the heating installation, ideally with ni-
trogen, otherwise with air. Ensure that the drain valve is
open when topping up.
2. If water escapes from the valve of the expansion
vessel, you must replace the expansion vessel
(→ Page 41).
3. Fill and purge the heating installation. (→ Page 30)
12.13 Completing inspection and maintenance
work
1. Start a test operation after the maintenance.
2. Check the heating mode and, if required, the domestic
hot water generation (if available).
3. Check the gas type. (→ Page 30)
4. Check the gas connection pressure (gas flow pressure).
(→ Page 31)
5. Check the CO₂ content. (→ Page 32)
6. Install the front casing.
7. Fill out the relevant Service Record section in the
Benchmark Checklist.
12.14 Checking the product for leak-tightness
▶ Check that the product is leak-tight. (→ Page 32)
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