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Australian Hydronic Supplies
10 Frankston Gardens Drive
Carrum Downs, Victoria,
Australia 3201
8.4 Pipe in screed installation method
1.
Install Polystyrene insulation over the concrete
slab
2.
Place polyethylene membrane over the
insulation. Membrane prevents escape of the
water from the screed.
3.
Install sound insulating edge strip along walls
and around ascending structural components.
E.g. door frames or columns.
4.
Edge insulating strip is made from closed cell
PE foam and it allows for the expansion of the
heated screed and prevents thermal and
acoustic bridging to the outside wall.
5.
Install pipes in either classic serpentine or
compacted marginal zone serpentine lying
pattern.
6.
Integrated marginal zone serpentine laying
pattern provides more even temperature
distribution
across
the
floor
8.4.1 Filling the system
1.
The circuits must be flushed with water so that
they are free from air. The individual heating
circuits are flushed consecutively, during
which the heating valves for each other circuit
must be closed.
2.
Proceed as follows:-
3.
Check that all manifold connections are tight.
4.
Close fully ALL Flow valves and ALL return
valves.
5.
Connect a hose to the flow Drain/Fill valve and
a hole from the return Drain/Fill valve to a
suitable visible drain point.
6.
Open No. 1 flow and return valve. Turn on the
water, allow the all the air to purge through the
circuit until clear.
7.
When satisfied there is no more air in circuit
No. 1. Close the return valve of No. 1 circuit.
8.
Simultaneously close the flow valve of circuit
No. 1 and open the flow valve of circuit No. 2.
Then open the return valve of No. 2 to repeat
the purging of air in that circuit.
9.
Repeat steps 4 to 6 until all circuits have been
purged of air. At this point the whole system
should be full of water and all the circuit valves
closed.
10.
Check that the main flow and return pipes
from the manifold to the boiler connections are
full of water by purging air from temporary air
bleed valves fitted to the capped ends at the
boiler location
.
8.4.2 Pressure testing the system
11.
The system should be filled with water and bled of
all air though the air bleed valves fitted to the
manifolds and the main pipes to the boiler. (Refer to
filling the system 8.4.1 above).
12.
DO NOT USE COMPRESSED AIR
.
13.
Pressure test the system with the aid of a test
bucket and pressure gauges, to ensure that the
system is free of any leaks.
14.
Proceed as follows:-
15.
Open all flow and return valves.
16.
Fill pressure pump and connect to system at a
convenient point out side of the concrete pour area.
17.
Apply pressure to 6 Bar to the system.
18.
Check all joins for leaks.
19.
Re pressurise the system until the pressure
remains stable.
20.
Note that the test pressure will be affected by
ambient temperature changes. A 10
o
C change
corresponds to a 0.5 – 1.0 Bar pressure variation. A
normal settled gauge pressure of between 3.5 and
4.5 Bar during testing would be satisfactory.
21.
Leave the system under pressure with a visible
pressure gauge during the concrete pour to ensure
that any leaks caused by an improper concrete
pour are quickly found.
22.
Check to see if the system is under pressure prior
to the pour and note the pressure at the gauge
.
