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2. Installation
Why is a DC pipe interrupter
supplied?
When urinals are flushed directly from the mains
water supply, the Water Regulations require
that the water supply be protected by a suitable
category 5 protection method or device. In the
case of urinals, this can be achieved in three ways:
1.
The use of a WRAS approved type DC pipe
interrupter (supplied with Cistermiser Direct Flush).
2.
The use of a dedicated supply for flushing use
only, supplied from a break tank that protects the
mains supply with a type AA, AB or AD air gap.
3.
The use of a specific type of urinal which has
been tested and shown to incorporate the
equivalent of a type AB air gap.
What are the possible implications
of fitting a DC pipe interrupter?
1.
Water may overflow from the DC pipe
interrupter if the sparge or pipe run leading to
the sparge is too restrictive. (See diagram
A
opposite). This may also occur if there are too
many bends in the pipework.
2.
If the feed to the urinal is coming directly from
the mains water supply, the pressure may be
too high for the sparge and bowl and splashing
may occur in the urinal bowl.
3.
System pressure is lost when a DC pipe
interrupter if fitted, therefore the flush
performance may change after installing a DC
pipe interrupter.
How to install a DC pipe
interrupter correctly
1.
To avoid overflowing:
•
Install a free-flowing, low restriction sparge.
•
Install the DC pipe interrupter and valve as high
as possible and use as long a pipe run between
the pipe interrupter and the sparge as possible.
(See diagram
A
opposite)
•
Select the appropriate flow regulator to match
the flow through the urinal sparge provided.
•
Use a large pipe size in the pipework between
the DC pipe interrupter and the sparge.
•
Minimise pipe bends between the DC pipe
interrupter and the sparge.
2.
To avoid splashing:
•
Fit a sparge and urinal bowl to accommodate
the pressure.
•
Select the appropriate flow regulator to fit onto
the pipe interrupter provided.
IMPORTANT:
Read this before fitting the urinal valve when flushing directly from the mains supply
NOTE:
When using flexible pipes: flexible pipes
typically have a smaller internal diameter than
copper pipes. A greater distance between the
valve and sparge may therefore be required.
Ensure there are no kinks in the flexible pipe.
NOTE:
For grey water/rain water harvesting.
Ensure adequate filtering is fitted, a 10μm filter
is recommended. For chemical water treatment.
If the water system has been treated with
chemicals, ensure the system is thoroughly
flushed before fitting any Cistermiser products.
Concentrated chemicals in dead legs can damage
the product and result in failure. If the water is
treated with Chlorine Dioxide (ClO2), concentration
levels must be maintained below 5ppm.
NOTE:
As with all water containing products, limescale
in hard water areas can affect the products
performance. This can result in maintenance to
remove the limescale as and when required.
