Installing The Expansion Vessel - IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual

The heat pump and collector hose in general
You can connect the collector hose to the heat pump with one or more circuits. In a multi-circuit solution, the collector
hoses are connected in parallel as illustrated below. The parallel hoses are connected to two distributors. Each coil should
have a shutoff valve and a control valve. The control valve is adjusted so that the fl ow rate is the same in the coils. The coils
should be approximately the same length.
After the distributor and the valves the coils are connected to a collecting pipe. A fi lling unit, particle fi lter and an
expansion vessel are connected to the collecting pipe. A safety valve is connected to the outgoing pipe. The safety valve
leads off any overpressure.
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 headings Connecting the heat pump to the heating system /Filling water in the heating system
and Filling the heat transfer fl uid in the collector hose.
Expansion tank Filter
Heat pump

Installing the expansion vessel

It is important when installing the expansion vessel 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 tank above the pump, it can be posi-
tioned as illustrated in the fi gure to the left. It is important to install the tank
so that any air disappears upwards. Air will remain in the circuit if the tank is
fi tted incorrectly (see the fi gure to the right).
Correct
Single circuit solution
Filling unit
Ground, lake or rock
collector
Expansion tank
Filter
Filling unit
Heat pump
Wrong
46
Multi-circuit solution
Control valve
Distributor
Ground,
lake or rock
collector