Checking The Water Pressure; Cleaning The Casing; Venting The System - DeDietrich AWHP 4MR–EMC 24/28 MI HYBRIDE User Manual

7 Maintenance
7.3

Cleaning the casing

7.4

Venting the system

Fig.52 Venting the system
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7.2.1 Checking the water pressure

Any air in the boiler, the pipes or the valves must be removed in order to
prevent unwanted noises that may occur during heating or when tapping
water. Proceed as follows:
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AD-3000484-B
1. Check the water pressure.
The water pressure must be at least 0.8 bar.
2. If the water pressure is lower than 0.8 bar, top up the central heating
system.
1. Clean the outside of the appliance using a damp cloth and a mild
detergent.
1. Open the valves of all the radiators connected to the system.
2. Set the room thermostat to the highest possible temperature.
3. Wait until the radiators are warm.
4. Ensure that the boiler is disconnected from the power supply.
5. Wait approximately ten minutes, until the radiators feel cold.
6. Vent the radiators. Work from the lowest to the highest.
7. Open the venting valve with the bleed key, keeping a cloth pressed
against the vent.
Warning
The water may still be hot.
8. Wait until water comes out of the venting valve and then close the
venting valve.
9. Turn the boiler on.
A four-minute venting cycle is performed automatically.
10. After venting, check that the water pressure in the system is still ad­
equate. If necessary, top up the central heating system.
11. Adjust the room thermostat or temperature control.
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