Specifications
12 – Installation VMBMH302
5 Piping installation
NOTE! To prevent leaks, ensure that there are no
stresses in the connecting pipes!
NOTE! It is important that the heating system
is bled after installation. Bleed valves must be
installed where necessary.
Piping installation must be carried out in accord-
ance with applicable local rules and regulations.
The hot water tank must be equipped with an
approved safety valve (supplied).
The pipes between the heat pump various units
should be isolated.
Ensure that the piping installation follows the
dimension and connection diagrams in Section 3
Heat pump information.
The position lists show the components and
parts included in the delivery in italics.
Radiator systems with closed expansion tanks
must also be supplied with approved pressure
gauges and safety valves.
Cold and hot water pipes as well as overflow
pipes from safety valves must be made of heat
resistant and corrosion-resistant material, e.g.
copper. The safety valve overflow pipes must
have an open connection to the drain and visibly
flow into this in a frost-free environment.
The connecting pipe between the expansion
tank and the safety valve must slope continu-
ously upwards. A continuous upwards slope
means that the pipe must not slope downwards
from the horizontal at any point.
5.1 System solution
In a VL system the heat pump can produce both heat-
ing and hot water with the compressor and the auxiliary
heater.
Production of heating and hot water cannot occur at the
same time because the exchange valve for heating/hot
water is positioned after the auxiliary heater.
The auxiliary heater carries out peak heating charging
(anti-legionella function) in those operating modes that
permit auxiliary heat.
Buffer tank
The buffer tank equalises the temperature to the heating
system during operation and after defrosting.
The recommendation for the volume is that 10
litres/kW installed heat pump output for heat
pumps with heater and 20 litres/kW for heat
pumps without heater.