Checking The Connections On The Flue Gas Side For Tightness; Checking The Safety Valve Function; Checking The Diaphragm Expansion Vessel And System Pressure; Checking The Thermal Insulation For Firm Seating - Viessmann Vitoladens 300-T Service Instructions For Contractors

Checking the connections on the flue gas side for tightness

Fig. 6
Checking the connections on the heating water and DHW sides for leaks

Checking the safety valve function

Checking the diaphragm expansion vessel and system pressure

Fig. 7
Note
Observe the information provided by the manufacturer
of the diaphragm expansion vessel.
Carry out this test on a cold system.

Checking the thermal insulation for firm seating

Note
Traces of condensate indicate a leak.
A
1. Remove thermal insulation strip
2. Check the heat exchanger fixings for firm seating.
3. Check the connector on the heat exchanger for
B
1. Drain the system until the pressure gauge indi-
2. If the pre-charge pressure of the diaphragm expan-
3. Top up with water until the charge pressure of the
Commissioning, inspection, maintenance
mal insulation mat out a little.
B
leaks.
cates "0" or close the cap valve on the diaphragm
expansion vessel and reduce the pressure in this
vessel.
sion vessel is lower than the static system pres-
sure, top up with nitrogen until the pre-charge pres-
sure is 0.1 to 0.2 bar (10 to 20 kPa) higher.
cooled system is 0.1 to 0.2 bar (10 to 20 kPa)
higher than the pre-charge pressure of the dia-
phragm expansion vessel.
Permiss. operating pressure: 3 bar (0.3 MPa)
and pull ther-
A
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