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PASHW-003-100LD
When servicing the unit, ducting should be checked to make sure that it is
clear and obstructions removed.
4.2 Water Supply
Bear 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 that it can meet peak demand.
NOTE:
A high mains water pressure will not always guarantee high flow rates.
The main supply pipe to the unit must 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 the unit
. 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
horizontally, and vertically upright, otherwise this
could cause problems with condensate draining from the heat pump section
of the unit into 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.
