5 ©ESP Ltd. Sept 2008
Please be sure to use appropriate lifting equipment when moving the unit.
1.3 WATER SUPPLY
Bare in mind that the mains water supply to the property will be supplying both
the hot and cold water requirements simultaneously. Therefore, it is important
that the maximum water demand be assessed and the water supply checked to
ensure this demand can be met.
NOTE: A high mains water pressure will not always guarantee high flow rates.
Wherever possible the main supply pipe to the unit should be in 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 these values 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. 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 sited on a level surface
, otherwise this could cause prob-
lems with condensate draining from the heat pump section of the unit in to the
condensate drain.
An inline strainer 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 war-
ranty/guarantee. All fittings must be WRAS approved.
1.General Requirements
Hot water air source heat pump
Hot water air source heat pump
1.General Requirements
1.4 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 should be tee‟d off the sup-
ply to the unit immediately after the Cold Water Combination Valve (see Fig-
ures 4 and 5). Branches to cold drinking water outlets should be taken before
the valve.
NOTE: Accessories should have a rated operating pressure of at least 0.8 MPa (8 bar).
1.5 LIMITATIONS
The unit should not be used in any of the following instances:
Solid fuel boilers or any other boiler in which the energy input is not under
effective thermostatic control, unless additional and appropriate safety
measures are installed.
Gravity circulation primaries.
Steam heating plant unless additional and appropriate safety devices are
installed.
Ascending spray type bidets or any other Class 5 back syphonage risk re-
quiring that a appropriate air gap be employed.
Water supplies that have either inadequate pressure or where the supply
may be intermittent.
Situations where it is not possible to safely pipe away any discharge from
the safety valves.
Areas where the water contains a high proportion of solids, eg. suspended
matter that could block the strainer, unless adequate filtration can be en-
sured.
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 re-
quirements of:
