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Australian Hydronic Supplies
10 Frankston Gardens Drive
Carrum Downs, Victoria,
Australia 3201
10.0 Expansion vessels sizing
Calculate the total water volume in the system, add the following together:
Item
Qty
Size
Volume per unit
Total Volume
Boiler
1
L
Manifolds
Std
L
Pipe – Circuits
16mm x 100M
14.5 L per 100M
L
Pipe – Main Feed
2
30mm x M
72.0 L per100M
L
L
L
Total Volume
A
- 5% of Volume
B
- 10% of Volume
L
L
L
Select expansion vessel between
A
and
B
Notes:
1.
Use volume of all pipes both flow and return including bends and tees to estimate total volume.
2.
Use the table above.
3.
For volume of boiler refer to the manufacturer’s information.
4.
Expansion allowance between 5% and 10% of this value.
5.
Modern boilers usually have a build in expansion vessel of 7 – 10L capacity.
6.
Add an additional expansion to the return leg of the pipe work if the boiler expansion vessel is
inadequate. In operation this usually shows with boiler pressure of 3 Bar and water flowing
through the pressure relief valve.
Australian Hydronic Supplies Pty Ltd
is able to provide support and guidance in
designing and installing underfloor heating systems. On site, technical support is
available at all times from experienced sales engineers.
For further technical information refer to
Australian Hydronic Supplies Pty Ltd.
Tiemme’s
30/10 year warranty embraces both pipe material and accessories.
Warranties relating to design and installation should be obtained from the relevant
provider(s). Please refer to the Warranty Declaration section 14.0