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Potable Pipework
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 and the pipework must be
insulated to prevent excessive heat loss, leading to high running costs. A check valve must also be installed to
prevent back flow. The secondary circulation tank connection can be seen diagram below.
Secondary Circulation
Connection Point
Commissioning
Potable System
First the precharge pressure in the expansion vessel must be checked to verify it is 0.3 bar below the inlet group
setting ex. 3 bar inlet = 2.7 vessel. The valve is of the Schrader car tyre type. The adjusting of the presure should
be done before the expansion vessel is installed.
Check all the connections for water tightness including any factory-made connections such as the immersion
heater and the temperature and pressure relief valve.
Prior to filling, open the hot tap furthest away from the cylinder to expel air. Open the
cold main isolation valve and allow the unit to fill. Once the cylinder has been fully
commissioned it should be heated to its normal operating temperature.
Heating System
The fill flush and flow meter is an important component of any heat pump
system. It is provided in all Joule Heat Pump kits. For all heat pump systems a
flow rate of over 7 l/min is required. It provides connections for the fill and flush
ports of the heating system flush pump for installation and ongoing servicing.
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