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NOTE: A high mains water pressure will not always guarantee high flow rates. The main supply pipe to the
unit must be 22mm. The minimum mains water supply requirements should be 0.15 MPa (1.5 bar) working
pressure and 20 litres per minute flow rate
at the Ecocent
. At these levels, outlet flow rates may be poor if
several outlets are used simultaneously – the higher the available pressure and flow-rate the better the
system performance will be.
The unit has a design operating pressure of 3 bar which is controlled by the Cold Water
Combination Valve on the cold water feed pipework. The Cold Water Combination Valve can be
connected to a maximum mains supply pressure of 1.6 MPa (16 bar). The water supply must be of
wholesome water quality (Fluid Category 1 as defined by the Water Supply Regulations 1999).
The unit MUST be level (see above), otherwise this could cause problems with condensate draining from
the heat pump section of the unit in to the condensate drain.
An inline strainer (if open vented) and scale inhibitor (WRAS approved) must be fitted “in line”
on the water supply to the unit. Failure to fit these will invalidate the unit warranty/guarantee.
All fittings must be WRAS approved.
If installing the unit in unvented configuration, an “unvented Pack”, containing the required safety valves
must be supplied with the unit and there is likely to be an additional cost for this.
4.3 Outlet/Terminal Fittings (taps etc.).
The unit can be used in conjunction with most types of terminal fittings. It is helpful in many mixer
showers to have balanced hot and cold water supplies; in these instances the balanced cold water supply
can be taken from the tapping on the combination valve. Branches to cold drinking water outlets should be
taken before the combination valve.
NOTE: Accessories should have a rated operating pressure of at least 0.8 MPa (8 bar).
4.4 Limitations
The unit should not be used in any of the following instances:
With a water supply from solid fuel boilers or any other boiler in which the energy input is not
under effective thermostatic control, unless additional, necessary and appropriate safety measures
are installed.
With gravity circulation primaries unless a good head of pressure is available.
With steam heating plant unless additional and appropriate safety devices are installed.
With ascending spray type bidets or any other facility where there is a Class 5 back siphoning risk
requiring that an appropriate air gap be employed.
With water supplies that have either inadequate pressure or where the supply may be intermittent.
In situations where it is not possible to pipe away any discharge from the safety valves safely.
In areas where the water contains a high proportion of solids, e.g. suspended matter that could
block the strainer, unless adequate filtration can be ensured.
Where another appliance in the room is vented by way of an open flu.
The installation must be carried out in accordance with the relevant requirements of:
A) The appropriate Building Regulations: either The Building Regulation (England and
