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c)
d)
i)
ii)
i
ii)
iv)
b)
have
a
vertical
section of
pipe at least
300mm
long, below the
tundish
before any elbows
or
bends
in
the pipework
be installed
with
a
continuous
fall.
have
discharges visible
at both
the
tundish
and
the final point of
discharge but where
this
is
not
possible
or
is
practically
difficult there should
be
clear
visibility
at one or
other
of these
locations.
Examples
of acceptable discharge arrangements are;
ideally
below
a
fixed
grating
and above the
water
seal
in
a
trapped
gully.
Downward
discharges
at low
level;
i.e.
up
to
1OOmm
above external surfaces such
as
car
parks,
hard standings, grassed
area etc. are
acceptable
providing that
where
children
may play
or
otherwise
come
into contact with
discharges
a
wire
cage or similar
guard
is
positioned
to
prevent
contact,
whilst maintaining visibility.
Discharges
at high
level; e.g.
into
a
metal
hopper
and
metal
down
pipe
with the end
of
the
discharge clearly visible
(tundish
visible
or
not) or
onto
a
roof capable of
withstanding high
temperature
discharges of
water
3m
from
any plastics
guttering
system
that would collect
such discharges
(tundish
visible)
Where
a
single
pipe
serves a
number
of discharges. such
as
in
block
of
flats,
the number
served
should
be
limited to not
more
than
6
systems
so
that
and
installation
discharging can
be
traced
reasonable easily.The single
common
discharge
pipe should
be at least
on pipe
size
larger
than the
largest
individual
discharge
pipe
D2
to
be
connected
lf
unvented
hot
water
storage systems
are
installed where discharges
from
safety devices may
not
be
apparent
i.e.
in
dwellings occupied
by blind,
infirm
or disabled
people,consideration should
be given
to
the installation
of an
electronically
operated device to warn
when
discharge takes place.
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Note:
The discharge
will
consist of scalding
water and
steam. Asphalt,
roofing felt and nonmetallic rainwater goods
may
be
damaged
by such discharges.
7.
Flushing and Commissioning
-
Ensure
all
pipe connections
are
tight, including immersion heate(s).
-
Check
the immersion
heater
setting
is
not above
60C
and
that the
live
and
neutral connec-
tions
are
correct.
-
Open
a
hot
tap
farthest from the
unit. Open
the
mains stop cock
to fill the unit.
-
Flush
for
three
minutes.
- Close
off taps and check
pipework for
leaks.
- Switch
on electricity to the immersion heate(s)
or switch on
the
boiler.
Refer
to
boiler
manu
facturer
s
instructions
or
commissioning.
- Bring
the unit to approx
65C.
Check
that
water does not discharge
via
theTundish pipework
during
heating.
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