Installation Instructions
1) Sweep floor, and remove any protrusions from the floor surface, make
sure floor is dry. A levelling screed may be used where required
to level floor surface or In minor cases of unevenness sand may be used.
Wood blocks may be used to provide support for basins, Bidets and WC pans
etc.
2) Fix manifold(s) in position(s) shown on layout drawing using installation
kit provided making due allowance for connecting pipes and any other equipment
to be Installed adjacent to the manifold. Manifolds should be installed
at approximately 600mm up from the subfloor or as required.
3) Run edge insulation strip around room perimeter, overlapping at joins.
4) Cut and fit insulation until floor area is completely covered.
5) Lay polyethylene building film on top of the insulation, making sure
that film extends up the walls by 200mm and that the film overlaps at
joints by approximately 100mm. (Joints do not need to be sealed).
Pay attention to expansion joint positions shown on drawing or agreed
with architect.
6) Lay grid on top of insulation making sure that grid legs' face down,
using grid binders. Wire grid edges together,(4 binding wires per
grid). Cut grid where required. Grid should overlap by 100mm.
Grid should stop just short of the edge Insulation strip and also should
be carried under cupboards etc, even though there may be no heating pipes.
PLEASE OBSERVE SAFETY PRECAUTIONS WHEN HANDLING AND CUTTING GRID
7) Arrange and fix clips according to pipe spacing shown on layout drawing,
with one clip to every 0.5 metre of pipe run and two at bends. When
not shown at a different spacing, connecting pipe 'tails' from the manifold
to the heating circuit should be spaced at 100mm between flow and return.
8) Starting at the appropriate heating circuit at the manifold, connect
pipe to flow and then clip pipe to grid according to layout drawing and
previously laid pipe clips. Velta PEX 151 pipe is marked at 1 metre
Intervals to enable the correct length of pipe for the heating circuit
to be easily measured off. The beginning metre mark will probably
not start at one as the markings actually indicate the length of pipe
within a manufactured batch. For example: If the start mark is 2345
and 100 metres of pipe is required then the pipe should be cut off at
2445. Pipe must be laid in the 'snail' pattern as detailed previously
unless shown otherwise.
There will be no pipe joints in the floor unless previously agreed.
If, at any time the pipe is accidentally kinked it may be restored to
the proper shape without damage by gently applying hot air from a heat
gun until the plastic 'remembers' its correct shape.
When back at manifold cut pipe to length and connect pipe to appropriate
return connection on manifold. When all heating circuits have been
completed; make sure
manifold connections are tight.
9) Connect hose to manifold flow connection on the left hand side of the
manifold. Connect other end of hose to a suitable mains water supply.
Connect another hose to the manifold return connection on the right hand
side of the manifold. Other end of hose should be taken to a suitable
drain point.
Make sure all heating circuits are shut down. White control valves
on the lower half of the manifold should be turned CLOCKWISE as
should the white valve covers on the top half of the manifold. Turn
on water supply to the manifold.
10) Starting at the left-most heating circuit open the control valve slowly
anticlockwise until water flows into the heating pipe. Continue
opening until valve is fully open (3.5 turns). Slowly open appropriate
white valve cover anticlockwise. Water will now flow through the
circuit and out of the drain hosepipe taking any air with it. When
all air has been expelled from the heating circuit close off both knobs
and repeat for the next heating circuit, until all heating circuits have
been filled.
11) Turn off water supply and remove hosepipes. Blank off manifold
return outlet (1" bsp female connection on right hand side of manifold).
Attach Test pressure pump to manifold flow socket (1" bsp female
connection on left hand side of manifold). Open all heating circuit
valves. Pressurise heating system to 4 bar pressure (60psi) bleeding
off residual air from air vents on the manifold top. Check visually
all heating circuits and manifold connections for leaks. If, after 24
hours pressure has not dropped screeding may commence.
UNDERFLOOR HEATING MUST REMAIN PRESSURISED WHILST SCREEDING
