Ideal Heating Logic Air DHW IDEPLUHP180DUOPPSZ, Установка и обслуживание, Страница: 35 / 94

Section 4 - Installation
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Installation and Maintenance
4.2.3 Hydronic Connections
4.2.3.1 Performance Recommendations
The highest hot or cold water draw off point should not exceed
10 metres above the Pressure Reducing Valve.
In larger properties with a number of bathrooms/en-suites
and long pipe runs we would recommend that the balanced
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. Check the
performance requirements of the terminal fittings with regard
to flow/pressure are suitable. Aerated taps are recommended
to prevent splashing.
4.2.3.2 Shower Fitting Guidance
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.
4.2.3.3 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.
4.2.3.4 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.
4.2.3.5 Secondary Hot Water Circulation
All models 210 and above are fitted with a secondary return
tapping as standard. 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 MUST be
insulated.