Checking Pressure Conditions, Adjusting The Expansion Vessel Pre-Charge Pressure If Necessary - Viessmann VITOSOL-F Service Instructions Manual

Checking pressure conditions, adjusting the expansion vessel pre-charge
pressure if necessary
This process cannot be carried out while the solar
thermal system is in operation.
1. Cover the collectors with tarpaulins.
2. Determine the charge pressure:
Solar thermal system pressure = system pres-
■
sure
■ System pressure + 0.1 bar pressure reserve for
venting
3. Determine the pre-charge pressure of the expan-
sion vessel:
Value for system pressure minus 0.3 bar for
hydraulic seal
5
Fig. 1
1
P
3
5
Commissioning, inspection, maintenance
4. Check the pre-charge pressure and adjust if
required.
The solar service case (accessories) contains a
pressure gauge.
5. Enter the values in the table below (for subsequent
inspection and maintenance work).
2
4
7