Panasonic Aquarea Tank Duo GH 200 Design, Installation & Servicing Instructions page 11

General Restrictions
a. The highest hot or cold water draw off point should not exceed 10 metres above
the Pressure Reducing Valve.
b. An ascending spray type bidet or any other appliance with a Class 1 back-syphonage
risk requiring a type A air gap should not be used.
c. Aquarea should not be used where steam is the primary heating medium, or in a
situation where maintenance is likely to be neglected.
d. Unvented cylinders are not suitable for use with solid fuel boilers.
e. If the supply to the mixer fittings (other than a dual outlet type) is not taken
from the balanced supply the system will become over pressurized and cause
the pressure relief valve to discharge. Over time this could also cause the
premature failure of the appliance itself which will not be covered by the
warranty.
f. In larger properties with a number of bathrooms/en-suites and long pipe runs
we would recommend that the balance cold supply is provided with its own
pressure reducing valve and is not taken from the balanced cold connection on
the combination valve. In this case it will also be necessary to fit a small expansion
vessel on the balanced cold water system to accommodate the pressure rise caused
by the increase in temperature of the balanced cold water.
g. Check the performance requirements of the terminal fittings with regard to flow/
pressure are suitable.
Shower Fittings
Aerated taps are recommended to prevent splashing. Any type of shower mixing valve
can be used as long as both the hot and cold supplies are mains fed. However, all
mains pressure systems are subject to dynamic changes particularly when other hot
and cold taps/showers are opened and closed, which will cause changes in the water
temperature at mixed water outlets such as showers. For this reason and because
these are now no more expensive than a manual shower we strongly recommend
the use of thermostatic showers with this appliance. These must be used in 3 storey
properties where the impact on pressure/temperature of opening another tap in the
system is greater than normal. The shower head provided must also be suitable for
mains pressure supplies.
DHW
P&T
ERV/NRV
TO
EXTERNAL
TAP
DC
M
DC
INCOMING COLD SUPPLY
SH
PRV
SCV
WM or DWM
SINK
DC
WATER SOFTENER (IF NECESSARY)
INSTALLATION
Pipe Layout
In all mains pressure installations it is important
to remember that the incoming cold supply
must be shared between all terminal fittings. It
is important that a 22mm supply is brought to
the appliance and a 22mm take-off is continued
at least to the bath. If there are two baths, 28mm
pipework should be considered. One metre of
smaller diameter pipework, or flow restrictors,
should be provided on the final connection to
all outlets so as to balance the water available.
In any event the distribution pipework should
generally be in accordance with BS EN 806-1 to 5.
Plastic Pipework
This appliance is suitable for use with
plastic pipework as long as the material
is recommended for the purpose by the
manufacturer and is installed fully in accordance
with their recommendations.
Secondary Hot Water Circulation
Some models are fitted with a secondary
return tapping as standard (see table 1 for
details). If fitted, an extra expansion vessel
may be necessary. A non-return valve MUST
be FITTED near the return connection. No valve
or terminal fitting should be installed between
the non return valve and the cylinder. All pipes
kept hot by the secondary circulation should
be insulated.
WHB
WC BATH
SCV
DCV
Page 11
Note:
Cold supplies to single taps must be
taken from the mains cold water
system.
Cold supplies to mixer taps must be
taken from the balanced cold water
connection on the combination
valve.
WHB W.C.
DC
DC
INSTALLATION