Service of the expansion vessel:
Checking the initial pressure of the gas space in the expansion vessel. To check the initial pressure of the gas space, it is necessary to disconnect the vessel from the water supply system, drain the water and connect a pressure gauge to the gas space nipple. If the pressure is lower than the set value during installation, the vessel needs to be inflated through the same nipple using a compressor (e.g. an automotive compressor).
Checking the pump switch-on and switch-off pressure. The switch-on and switch-off pressure of the pump is measured using a pressure gauge installed on the expansion vessel. To do this, open any water supply valve and record the pressure value at the moment the pump switches on. The switch-off pressure is recorded after closing the valve and switching off the pump.
Malfunction | Possible cause | Remedy |
---|---|---|
The pump turns on and off too often | Lack of compressed air (nitrogen) in the expansion vessel | Inflate the vessel with a car compressor |
- | Damaged membrane | Replace the membrane with an original one |
- | Damaged vessel body | Restore the integrity of the body to ensure air tightness |
- | Small differential between the pump turn-on and turn-off pressure | Increase the difference between the turn-on and turn-off pressure on the pressure switch |
- | Insufficient expansion vessel volume | Check Expansion Vessel Volume Calculation |
Water leak from the air valve | Damaged membrane | Replace the membrane with an original one |
Air pressure below calculated value | Air valve does not provide airtight closure | Blow the valve and restore the calculated pressure in the air chamber |
Water pressure below normal | Lack of compressed air (nitrogen) in the expansion vessel | Inflate the vessel with a car compressor |
- | The pump does not create the necessary pressure | Check the correctness of the pump selection and its condition |
Repair of an expansion vessel in case of a membrane rupture. To detect a torn membrane, it is necessary to disconnect the vessel from the water supply system and drain the water. If air comes out of the drain valve, it means that the integrity of the membrane is compromised.
It is better to replace the torn membrane if it is replaceable. Gluing the membrane is not recommended since most adhesives are not allowed for use with drinking water, and the cyclic stretching-compression of the membrane, which occurs several times per hour, is destructive for glued joints.
Attention!
Replacement of parts is allowed only with original spare parts from the vessel manufacturer.
It is best to fill the air chamber with an inert gas, such as nitrogen.
Before removing the gas from the air chamber, it is necessary to drain the water from the vessel.
The service life of the expansion vessel decreases at maximum values and overloads, as well as outside the range of specified temperatures.
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