Adjusting The Pre-Charge Pressure Of The Diaphragm Expansion Vessel On The Dhw Side (If Installed) - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Adjusting the pre-charge pressure of the diaphragm expansion vessel on the
DHW side (if installed)
Fig. 15
Test connector, heating water expansion vessel
A
Test connector, DHW expansion vessel (if instal-
B
led)
DHW-side system pressure (bar)
2.5
3.0
3.5
Specification for DHW-side diaphragm expansion ves-
sel (accessories):
■ Pre-charge pressure factory setting 5.2 bar
■ Max. operating pressure 10 bar
■ Max. DHW temperature 65 °C
20
Adjust the pre-charge pressure of the DHW-side dia-
phragm expansion vessel (accessories) in accordance
with the system pressure on the DHW side:
B
A
Response pressure, safety valve (bar)
Pre-charge pressure of DHW-side diaphragm
expansion vessel (bar)
6 8
2.3
–
2.8
–
– –
10
2.3
2.8
3.3