15
17.0
MINIMUM
PLUMBING
REQUIREMENTS
This
installation
should
be
in
accordance
with
BS
5449
code
of
practises.
It
must
include
a
gravity
circuit
with
an
expansion
tank
open
to
the
atmosphere.
When
installing
this
appliance
on
a
gravity
circuit,
the
system
should
consist
of
a
tank/indirect
cylinder
fixed
in
an
upright
position
and
should
be
connected
to
the
boiler
by
28mm
pipe
both
flow
and
return.
The
pipes
should
not
exceed
7.8m
in
length.
The
shorter
the
run
of
pipe
work
the
more
effective
the
appliance
is
going
to
be
at
heating
the
water.
The
cylinder
and
pipe
work
should
be
lagged
to
minimise
the
heat
loss
in
the
system.
A
heat
leak
radiator
must
be
incorporated
into
the
system
to
dissipate
any
excess
heat
produced
from
the
boiler
when
connected
demands
are
low.
The
heat
leak
must
comprise
a
minimum
of
10%
of
the
boiler
output.
Fit
the
heat
leak
radiator
in
the
gravity
circuit
using
22mm
pipe
reducing
15mm
for
no
more
than
300mm
before
the
radiator.
18.0
BOILER
CONNECTIONS
The
Thermo
Verona
16
is
fitted
with
2
connections
for
piping.
These
connections
are
1
Inch
BSP
and
are
a
female
thread.
19.0
CHECKS
ON
INITIAL
FIRING
Before
connecting
up
the
boiler
the
installer
must
ensure
that
they
thoroughly
flush
all
of
the
systems
pipes
in
order
to
remove
any
residue
which
could
compromise
the
correct
operation
of
all
system
components
(Pumps,
valves
etc).
It
is
also
important
to
verify
the
chimney
has
sufficient
draught,
there
are
no
blockages
and
that
no
other
appliance
exhausts
are
inserted
into
the
flue.
20.0
FILLING
UP
THE
SYSTEM
ONCe
all
connections
are
complete
the
installer
can
proceed
with
the
boiler
connection.
Open
all
the
vent
pipes
of
the
radiators,
the
boiler
and
the
system.
Gradually
open
the
load
valve,
ensuring
that
the
air
vent
pipes
are
working
correctly.
Use
the
gauge
to
confirm
the
system
is
pressurised.
With
closed
tank
systems,
a
pressure
of
0.11
–
0.12
MPa
(1.1
–
1.2
bar)
must
be
reached.
21.0
CPS
–
CORROSION
PREVENTION
SYSTEM
The
CPS
is
a
three
‐
way
valve
(regulated
by
temperature)
that
improves
the
efficiency
of
the
boiler,
reduces
condensation
and
actively
prolongs
the
longevity
of
the
boiler.
It
does
this
by
not
allowing
cold
water
from
the
heating
system
to
be
directly
introduced
into
the
boiler
until
a
desired
temperature
is
reached,
in
this
case
55°C.
The
CPS
valve
used
is
an
ESBE
VTC500
–
we
would
recommend
that
this
is
installed
if
the
system
fitted
is
an
open
vented
fully
pumped
system.
Flow
Pump
Return
CPS
Valve
(ESBE
VTC500)
A
B
AB
