gledhill GC2000/120/E-OV Design, Installation & Servicing Instructions page 12

Second
Pressure limiting valve NOT
dwelling
REQUIRED at pressures
below 5 bar if terminal
fittings have flow regulators
fitted.
Sink
H C
a a
Check valve NOT REQUIRED unless
chemical water treatment unit is fitted.
M.C.W.S Double check valve NOT REQUIRED unless supply
supply pipe. pipe services more than one dwelling.
Figure 9 Hot & Cold Water Distribution Network
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Supplied By www.heating spares.co Tel. 0161 620 6677
Gate valve - can be used to isolate in case
of maintanance or to restrict the total flow
rate if flow restriction is not provided
Shower.
a
Scale inhibitor
GS 2000
NOT REQUIRED
'a'
- flow regulator recommended for better
balance of hot and cold water supplies.
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Figure 10
SYSTEM DESIGN
However, we are happy that plastic pipework
systems can be used in place of copper
internally as long as the chosen system is
recommended for use on domestic hot and
cold water systems by the manufacturer and is
installed fully in accordance with their
recommendations.
Hand
This is particularly important in relation to
Bath basin
use of push fit connections when using the
H C H C
optional flexible hose kits see Installation &
a a a a
Wiring - 2. Fitting the Appliance.
It is also essential that if an alternative pipework
material/system is chosen the manufacturer
confirms that the design criteria of the new
system is at least equivalent to the use of BS/EN
Standard copper pipework and fittings.
2.4 Taps/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. To minimise the impact of this we would
always recommend the use of thermostatic
showers with this appliance.
The shower head provided must also be
suitable for mains pressure supplies.
However, if it is proposed to use a 'whole
body'or similar shower with a number of high
flow/pressure outlets please discuss with the
Gledhill technical department.
The hot water supply to a shower-mixing valve
should be fed wherever practical directly from
the GulfStream 2000 or be the first draw-off
point on the hot circuit. The cold supply
to a shower-mixing valve should wherever
practical be fed directly from the rising mains
via an independent branch. The shower must
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incorporate or be fitted with the necessary
check valves to provide back-syphonage
protection in accordance with the Water
Regulations. The supply of hot and cold mains
water directly to a bidet is permitted provided
that it is of the over-rim flushing type and that
a type 'A' air gap is incorporated.
2.5 Hot and Cold Water System
If the length of the hot water draw off pipework
is excessive and the delivery time will be more
than 60 seconds before hot water is available
at the tap,you may wish to consider using trace
heating to the hot water pipework such as the
Raychem HWAT system. Please consult Gledhill
technical department for further details.
Page 12
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