System Pressure - Viessmann VITORONDENS 200-T Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
Checking the diaphragm expansion vessel and system pressure
Note
Observe the diaphragm expansion ves-
sel manufacturer's instructions.
Carry out this test on a cold system.
Checking the mixer for ease of operation and leaks
1. Remove the motorised lever from the
mixer handle and check the mixer for
ease of operation.
Checking the ventilation air connection to the burner (if installed)
Balanced flue operation: Checking the
ventilation air connection for damage.
Adjusting the burner
Burner service instructions
16
(cont.)
1. Drain the system until the pressure
gauge A indicates "0" or close the
cap valve on the diaphragm expan-
sion vessel and reduce the pressure
in this vessel.
2. If the pre-charge pressure of the dia-
phragm expansion vessel is lower
than the static system pressure, top
up with nitrogen until the pre-charge
pressure is 0.1 to 0.2 bar higher.
3. Top up with water until the charge
pressure of the cooled system is 0.1
to 0.2 bar higher than the pre-charge
pressure of the diaphragm expansion
vessel.
Permiss. operating pressure: 3 bar
2. Check the mixer for leaks. Replace
the O-ring gaskets if the mixer is leak-
ing.
3. Snap the motorised lever into place.