Installing The Expansion Vessel - Worcester GREENSTORE Instruction Manual

The heat pump and collector hose in general
The collector hose can be connected to the heat pump with one or more circuits. In a multi-circuit system, the collector
pipes are connected in parallel as illustrated below. The parallel pipes are connected to two manifolds. Each coil should
have a shut off valve and a fl ow control valve. The fl ow control valve is adjusted so that the fl ow rate is the same in each
coil. The coils should have the same length.
After the manifolds and the fl ow control valves, the coils are connected to a collecting pipe. A fi lling link, fi lter and the
plastic expansion vessel supplied with the heat pump are connected to the collecting pipe. A pressure relief valve is
connected to the outgoing pipe.
One circuit at a time is fi lled with heat transfer fl uid. Keep the valves closed in the other loops during the process. Read
more about fi lling under the heading Connecting the heat pump to the heating system.
Single circuit system Multi-circuit system
Control valves
Collector
Collector
Expansion vessel
Expansion vessel
Filling link Filling link
Manifolds
Heat pump Heat pump

Installing the expansion vessel

The plastic expansion vessel for the collector circuit is supplied with the heat pump. It is important to position it at
the highest point in the circuit, preferably above the heat pump. If there is a low ceiling making it impossible to fi t the
expansion vessel above the pump, it can be positioned as illustrated in the diagram to the left. It is important to install the
expansion vessel so that any air disperses upwards. Air will remain in the circuit if the expansion vessel is fi tted incorrectly
(see the fi gure to the right).
Correct
Wrong
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