System layout

The Greenstore series of heat pumps has the versatility to be used in a variety of different system designs.

The Greenstore Combination models benefit from a built in 185 litre store of unvented hot water, providing a convenient hot water and heating solution in one product.

System design requirements

The heating system should be designed to maintain 70% of the nominal flow of the system across the heat pump at all times. Where TRVs are fitted this could be achieved by maintaining a fully open position on the valves. At least half of the coils in an underfloor heating circuit must remain open at all times. Alternatively, a bypass may be fitted in order to maintain the flow around the system if TRVs start to close down.

Where it is not possible, due to the design of the heat emitters, to maintain this flow rate a low loss header or a Worcester primary store of around 100 litres should be fitted.

Connecting the heat pump to the heating system

Care should be taken to avoid excessive use of flux on copper pipe connections to minimise the amount of debris that the filter can come into contact with.

System flushing and care

Central heating systems must be power flushed before the heat pump is installed. The system should be prepared in accordance with the guidelines of BS 7593 : 2006.

The filter on the primary circuit should be checked during the first week of operation to ensure that any debris is removed.