Checking Filling Pressure Of The Expansion Vessel Of The Combination Boiler; Checking Filling Pressure Of The Expansion Vessel Of The Shift Load Storage Tank - Vaillant ecoTEC plus 937 Instructions For Installation And Servicing

7.5 Checking filling pressure of the expansion
vessel of the combination boiler
Fig. 7.11 Checking filling pressure of the expansion vessel of
the combination boiler
Note!
h
This check need not be performed every year -
a check every three years is sufficient.
• Turn the isolation valvess of the central heating off.
• Release the pressure from the appliance.
• Remove the valve cover from the expansion vessel.
• Check that the internal pressure in the expansion
vessel is between 0.75 and 0.9 bar.
If the pressure is less than this, the vessel must be
pumped up again using an air pump.
• Refit the valve cover.
• Re-pressurise the combi boiler and the heating system.
ecoTEC plus 937 installation and maintenance manual
Inspection and maintenance 7
7.6 Checking filling pressure of the expansion
vessel of the shift load storage tank
1
Fig. 7.12 Checking filling pressure of the expansion vessel of
the shift load storage tank
h Note!
This check need not be performed every year -
a check every three years is sufficient.
• Close the isolation valves of the hot water system.
• Release the pressure from the appliance.
• Release the screw on the top cover of the shift load
storage tank and remove the cover.
The expansion vessel (1) is freely accessible
• Unscrew the seal cap (2) from the expansion vessel.
• Check that the internal pressure of the expansion
vessel is approx. 4 bar.
If the pressure is less than this, the vessel must be
pumped up again using an air pump.
• Screw the seal cap (2) back onto the expansion vessel.
• Re-fit the cover.
• Re-pressurise the combi boiler and the hot water
system.
2
1
49