Checking The Dhw Expansion Vessel (If Installed) And Pre-Charge Pressure; Checking The Safety Valve Function - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Checking the DHW expansion vessel (if installed) and pre-charge pressure

Fig. 37
1. Check the static pressure of the DHW line down-
stream of the pressure reducer and adjust if
required. Set value: Max. 3.0 bar (0.3 MPa)
2. Close the on-site shut-off valve in the cold water
line.
3. Turn levers on valves
position.
4. Close cold water supply

Checking the safety valve function

56
B
C
D
A
A and B to the "right-hand"
.
C
E
5. Drain the pipe via air vent valve
6. Check the pre-charge pressure of DHW expansion
vessel and adjust if necessary. Set value: Static
E
pressure minus 0.2 bar (20 kPa)
7. Return the levers of valves
position. Open cold water supply
site shut-off valve in the cold water line.
D .
A and B to the "top"
and the on-
C