Benchmark ACCOLADE 2000, Инструкции по проектированию, установке и обслуживанию

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c. As a general guideline, although a 15mm service my be sufficient for smaller
dwellings with one bathroom, a 22mm service (25mm MDPE) is preferred and
should be the minimum for larger dwellings.
d. If the incoming mains pressure exceeds 6 bar at any time in a 24 hour cycle then
a pressure regulating valve set at 3.5 bar should be fitted downstream of the stop
tap where the cold supply enters the property.
e. Equipment used in the system should be suitable for a working pressure of up to 5
bar.
Cold and hot water distribution network
a. As a minimum it is recommended that the cold supply to the appliance internally is
run in 22mm copper or equivalent in plastic and then from the appliance, hot and
cold services are in 22mm past the draw-off to the bath as shown schematically
in figure 2.1. For large properties bigger sizes will be necessary and these should
be proved by calculation in accordance with BS6700.
b. The highest hot or cold water draw-off point should not exceed 4 metres above
the appliance.
c. In typical dwellings, the cold water supply to any mixer fittings (other than dual
outlet fittings) should be taken from the balanced cold outlet connection on the
appliance. However, in larger dwellings with a number of bathrooms and en-suites
and long pipe runs, the balanced cold supply must be provided with its own
pressure regulating valve (set at the same pressure as the one provided
SH
WHB
SCV SCV
WC
BATH
22
22
15
15
WHB
WC
M
DC
DCV
DC
Scale Reducer (if required)
DCV
To
External
Tap
25mm MDPE
Incoming
Supply
WM or DWM
SINK
Discharge
Pipe
Ground
Level
with the appliance ie 1.5 bar static) and
not taken from the appliance. When a
separate pressure regulating valve is
used for the balanced cold water supply,
it is recommended that a small expansion
vessel (0.25 - 0.5 litre) is fitted after the
pressure regulator to accommodate the
pressure rise caused by the increase in
temperature of the balanced cold water.
d. Whenever possible the hot and cold water
supply to a shower-mixing valve should be
the first draw-off point on each circuit.
e. It is important that the cold water pipe work
is adequately separated from any heating/
hot water pipe work to ensure that the
water remains cold and of drinking water
quality.
figure 2.1 Typical cold and hot water network
Cold supplies to single taps taken from the mains cold water system.
Cold supplies to mixer taps only to be taken from the balanced cold water connection on the combination valve.
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1.3 SYSTEM DETAILS
1.0 DESIGN