DeDietrich MCA 45 User Manual page 38

6. Checking and maintenance
37
9. Attach the tube to the filling/draw-off valve. Firmly tighten the nut
on the filling tube.
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10.Open the filling/draw-off valve on the heating system.
11.Open the running water tap.
12.Check the water pressure in the installation shown on the control
panel display.
13.Close the water tap when the water pressure reaches 2 bar.
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14.Close the filling/draw-off valve on the heating system.Leave the
tube on the filling/draw-off valve until the air is purged from the
installation.
When water is added, air gets into the heating system.
Degas the installation. After the air has been vented, the
water pressure can drop below the required level. Check
the water pressure in the installation shown on the control
panel display. If the water pressure is lower than 0,8 bar,
more water should be added.
15.After filling the installation, switch the boiler on.
Filling and bleeding the installation 2 times a year should
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be sufficient to obtain an adequate hydraulic pressure. If it
is often necessary to top up the installation with water,
contact your fitter.
MCA 45 - 65 - 90 - 115
06/09/2010 - 300024828-001-A