Checking the initial pressure of the gas chamber in the expansion tank. To check the initial pressure of the gas chamber, disconnect the tank from the heating system, drain the water, and connect a pressure gauge to the gas chamber nipple. If the pressure is below the set value, the tank should be inflated with a compressor (such as an automobile compressor) through the same nipple.
Checking the integrity of the membrane. If air is released through the drain valve during the pressure check of the gas chamber after draining the water and the pressure drops to atmospheric, the membrane is punctured.
Malfunction | Possible cause | Remedy |
---|---|---|
Fluctuating pressure in the heating system that exceeds the allowable limit even at low temperatures | Lack of compressed air (nitrogen) in the expansion tank | Inflate the tank with a compressor (such as an automobile compressor) |
- | Damaged membrane | Replace the membrane with an original one (recommended at a service center) |
- | Damaged housing | Restore the housing integrity for sealing (recommended at a service center) |
- | Air chamber nipple does not provide a seal closure | Blow the nipple and restore the calculated pressure in the air chamber |
- | Insufficient volume of the expansion tank | Check the Calculation of the volume of the expansion tank |
Water leakage from the air valve | Damaged membrane | Replace the membrane with an original one (recommended at a service center) |
Low water pressure (the heat transfer fluid does not reach the upper point of the heating system) | Lack of compressed air (nitrogen) in the expansion tank | Inflate the tank with a compressor (such as an automobile compressor) |
Expansion tank repair. If damage to the membrane is detected during diagnostics, it must be replaced. Gluing the membrane is not recommended, as cyclic stretching-compression is destructive for glued connections.
Attention!
It is best to fill the air chamber with an inert gas, such as nitrogen.
Before removing the gas from the air chamber, drain the water from the tank.
The service life of the expansion tank is reduced at maximum values and overloads, as well as outside the specified temperature range.
Replacement of parts is allowed only with original spare parts from the tank manufacturer.
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