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STEP 1
From the table, find the volume factor appropriate to your system
STEP 2
Divide the volume of your calorifier by the volume factor, to give the expansion
tank volume you require
EXAMPLE
A 50 litre calorifer having a relief valve setting of 2.5 bar with a pump cut-out pressure of 1.4
bar (21psi).
From the table above we get a volume factor of 16.
We then divide the calorifier volume by this = 50 ÷ 16 = 3.1 litre
Then use the next larger size expansion tank - 5 litre (CW385)
Where do I fit an expansion tank?
The expansion tank should be fitted in the cold water feed line to the calorifier, between the
non-return valve and the calorifier.
How do I install an expansion tank?
Tanks may be installed in a vertical or horizontal position. The tank may be secured by stout
strapping or by stainless steel bands, or it may be mounted in a wooden cradle. A special
bracket mounting kit CW324 is available for the three smallest sizes
The steel tank casing is robust, but care should be taken during installation not to scratch, dent
or puncture the tank.
At what pressure do I set the expansion tank?
The tank is supplied charged with nitrogen gas at about 2.3 bar (35 psi). The pressure should
be adjusted to the cut-out pressure of the pressurised water pump. This should be done
before the tank is installed. Follow the pressure adjustment procedure described in SECTION
A, above.
Expansion tank setting with Jabsco Sensor-Max pump
The Jabsco Sensor-Max variable speed water pressure system pump requires the gas setting
on the expansion tank to be 0.2 bar above the pump cut-out pressure. Ask for the free
Cleghorn Waring leaflet
Check the pressure in the expansion tank every 6 months, and adjust it if necessary. Switch off
pump and open hot water outlets before doing so.
Winter precautions
To avoid risk of frost damage, drain all the water from your pressurised water system, before
winter lay-up. Switch off the pump, open all outlets until flow ceases. This will allow water to
be expelled from the expansion tank. Drain all remaining water from the lowest point in the
system. Remember to drain your calorifier from the bottom (cold water inlet)
Temperature range
Cleghorn Waring accumulator / expansion tank are designed for use within the temperature
range 0 to 90ºC.
Maintenance
Cleghorn Waring accumulator / expansion tanks require no regular maintenance.
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