4
INSTALLATION – GENERAL
(SEE FIGS. 2 - 6)
PIPE FITTINGS
All pipe fittings are made via 22mm compression
fittings directly to the unit. The fittings are threaded
3/4”BSP male parallel should threaded pipe connec-
tions be required.
COLD FEED
A 22mm cold water supply is recommended, how-
ever, if a 15mm (1/2”) supply exists, which provides
sufficient flow, this may be used (although more flow
noise may be experienced).
A stopcock or servicing valve should be incorporated
into the cold water supply to enable the POTTERTON
GOLD cylinder and its associated controls to be
isolated and serviced.
COLD WATER COMBINATION VALVE ASSEMBLY (FIG.
2)
The 2-piece cold water combination valve assembly
can be located anywhere on the cold water mains
supply prior to the expansion vessel ( see Fig. 6 Page
9 ) but the two pieces do not have to be installed
together.
Fig. 2: Cold water combination valve assembly
DRAIN TAP
A suitable draining tap should be installed in the cold
water supply to the POTTERTON GOLD cylinder
between the expansion valve ( see Fig. 6 Page 9 )
and the heater at as low a level as possible. It is
recommended that the outlet point of the drain
pipework be at least 1 metre below the level of the
heater (this can be achieved by attaching a hose to
the drain tap outlet spigot).
EXPANSION VESSEL
The expansion vessel accommodates expansion
that results from heating the water inside the unit.
The expansion vessel is pre-charged at 3.5 bar. The
expansion vessel must be connected between the
expansion valve (see Fig. 2) and the POTTERTON
GOLD cylinder
( see Fig. 6 Page 9 ).
The location of the
expansion vessel should allow access to recharge the
pressure as and when necessary, this can be done
using a normal car foot pump. It is recommended
that the expansion vessel is adequately supported.
An expansion vessel wall mounting bracket is
supplied for this purpose and should be fitted.
OPERATIONAL SUMMARY
Maximum mains pressure
16 bar
Operating pressure
3.5 bar
Expansion vessel charge pressure
3.5 bar
Expansion relief valve setting
6 bar
T&P relief valve setting
90°C/10 bar
Maximum primary circuit pressure
3 bar
(indirect only)
Storage capacity
See Table1
Weight when full
See Table1
LIMITATIONS
The POTTERTON GOLD cylinder should not be used
in association with any of the following:
•
Solid fuel boilers or any other boiler in which
the energy input is not under effective
thermostatic control, unless additional and
appropriate safety measures are installed.
•
Ascending spray type bidets or any other
class 1 back syphonage risk requiring that a type
A air gap be employed.
•
Steam heating plants unless additional and
appropriate safety devices are installed.
•
Situations where maintenance is likely to be
neglected or safety devices tampered with.
•
Water supplies that have either inadequate
pressure or where the supply may be intermittent.
•
Situations where it is not possible to safely
pipe away any discharge from the safety valves.
• In areas where the water consistently contains a
high proportion of solids, e.g. suspended matter
that could block the strainer, unless adequate
filtration can be ensured.
The pressure reducing valve incorporates the
pressure reducer and strainer and the expansion valve
incorporates the expansion and check valves. Ensure
that the valves are installed in the correct order
and orientation. No other valves should be placed
between the expansion valve and the POTTERTON
GOLD cylinder. A connection can be made between
the expansion and pressure reducing valves to
provide a balanced cold water connection. The
expansion valve connection must not be used for
any other purpose.
SECONDARY CIRCULATION
If secondary circulation is required it is recommended
that it be connected to the POTTERTON GOLD
cylinder as shown
in Fig. 3 v
ia a swept tee joint into
the cold feed to the unit. A swept tee joint is available
as an accessory (order code no. 5133565).
The secondary return pipe should be in 15mm pipe
and incorporate a check valve to prevent backflow.
A suitable WRAS approved bronze circulation pump
will be required. On large systems, due to the
