Checking The Diaphragm Expansion Vessel And System Pressure; Checking The Mixer For Ease Of Operation And Leaks; Checking The Ventilation Air Connection To The Burner (If Installed); Adjusting The Burner - Viessmann vitoladens 300-t Service Instructions Manual

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)

For balanced flue operation, check the
ventilation air connection for damage.

Adjusting the burner

Burner service instructions

Instructing the system user

The installer must instruct the user in the
operation of the system.
Commissioning, inspection, maintenance
1. Drain the system until the pressure
gauge indicates "0" or close the cap
valve on the diaphragm expansion
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-rings if the mixer is leaking.
(cont.)
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