17
QN3
QN8
QN7
QN4
QN6
QN5
GP1 RM4
RM3
XL1
XL9
XL2
XL4
XL5
4. WATER CIRCUIT
The water circuit must be installed in accordance with local norms and standards.
The water used must be drinking water.
Material compatibility in the whole system must be ensured. Incorrect material
combinations in the water circuit can lead to damage due to galvanic corrosion. This
requires special attention when using galvanized components and components that
contain copper.
The pipe sizes for on-site installation shall be based on the available water pressure
as well as the expected pressure loss in the pipe system.
As for all pressurized vessels, the heat pump water tank has to have an approved
safety valve (pressure setting depending on local rules and regulations) and a non
return/check valve on the cold water inlet.
The following figure depicts the suggested configuration on the water system, with
the possibility to include a water recirculation circuit. This last connection is optional.
XL1: Water outlet pipe connection
XL2: Water inlet pipe connection
XL4*: Coil top
XL5*: Coil bottom
XL9*: Water circulation connection
QN3: Shut-off valve water outlet
QN4: Shut-off valve water inlet
QN5: Drain valve
QN6: Safety valve
QN7: Shut-off valve pump inlet
QN8: Shut-off valve pump outlet
RM3: Check valve
RM4: Check valve water circulation
GP1: Water circulation pump
Figure 11 – Diagram of suggested water circuit connections
