 Underfloor Heating Manifolds
Manifolds are common to all systems above 25m2, independent of the floor
application. Manifolds are supplied complete and positioned on a bracket. They can
either be fixed directly to a wall or positioned in a manifold box.
The manifold comes complete with a drain and air
vent assembly, which can be positioned on either end
of the manifold. Isolation valves are supplied separately
for the supply end of each manifold.
The bottom manifold is the flow and the top manifold is
the return. Each manifold port comes complete with a
Polyplumb push fit connection. Pipes are connected to
manifolds by inserting a pipe stiffener into the pipe and
following the instructions on the jointing and de-mounting pages.
The flow meter on each flow port of the manifold
provides a visual indication of the flow through
each circuit.
Both manual and lockshield balancing can be
undertaken by either using the blue cap on the return
manifold for manual adjustment, or removing the
blue cap and adjusting using the key supplied with
each manifold.
 Preparing and installing the manifold
Remove the manifold from the box and arrange
the flow and return manifolds to ensure that the
inlets/outlets are pointing downwards. Remove the air
vent and drain valve from the packaging and connect
to the desired end of the manifold.
Ensure the seal is correctly in place before tightening
the compression nut by hand on to the manifold.
To ensure the valves are securely connected to the
manifold, use a 38mm spanner or wrench to tighten
by a further half turn.
Remove the isolating valves (supplied separately)
from the packaging and connect to the opposite end
of the manifold. As with the air vent and drain valve,
ensure the seal is correctly in place before tightening
the compression nut by hand on to the manifold.
Then, as previously, complete the connection by
using a 38mm spanner or wrench to tighten by a
further half turn.
Fix the manifold horizontally in the desired position
utilising both screw holes on each bracket.
The manifold is now in position and ready to be
connected to the mains from the boiler and the floor
heating circuits. A set of self adhesive stickers are
included to help identify each circuit on the manifold.
The stickers also provide the opportunity to record the
number of turns required for the correct flow rate
through each circuit (for further information see testing
and commissioning pages).
Flow setting and adjustment
As with any type of wet heating system, it is a
necessity to pressure test a floor heating system to
check the integrity of all the joints. To set the flow rate
of the circuit remove the protective blue cap from the
manifold port. Using the key, turn the spindle clockwise
until the manifold port valve is fully closed.
Adjust the flow of the port by turning the spindle
anti-clockwise. Three full turns of the spindle will open
the valve fully. Flow through the valve can be measured
by the flow meter on the flow ports of the manifold.
Once each manifold port has been set to the correct
flow rate the protective blue cap can be refitted.
Alternatively, if zone control is being utilised actuators
can be fitted to the relevant ports.
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