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Smart Plumb Compact Installation
Potable Pipework
Hot Water Outlet
Run the first part of the hot water distribution pipework in 22mm. This can be reduced to 15mm and
10mm as appropriate for the type of tap etc. Your aim should be to reduce the volume of the hot draw-
off pipework to a practical minimum so that the time taken for the hot water is as quick as possible.
Do not use monobloc mixer tap or showers if the balanced cold connection is not provided. Outlets of
this type can back pressurise the unit and result in discharge.
Secondary Circulation
On larger installations long pipe runs to draw-off points can cause significant volumes of water to be
drawn off before an acceptable temperature can be reached. Secondary pumped circulation using
a stainless steel or a bronze pump and combined with effective time and temperature controls can
overcome this problem. Where secondary return circulation is required the pipework should be run in
15mm pipe. A suitable WRAS approved stainless steel or bronze circulation pump must be used. A
check valve must also be installed to prevent back flow
Heat Pump Installation Guide
67
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