Filling The System - Viessmann VITOCAL 151-A Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Filling the system

The filling of the system is menu-guided with the com-
missioning assistant.
Fill and top-up water
Do not use antifreeze (e.g. water/glycol mixture) in the
heating water.
!
Please note
Unsuitable fill and top-up water increases the
level of deposits and corrosion. This can reduce
the output of the heat pump or cause damage to
the system, in particular to the integral instanta-
neous heating water heater.
■ Flush the heating system thoroughly before
filling.
Only fill with water of potable quality.
■
Only use fill and top-up water with a hardness
■
of < 3 °dH.
Filling the consumer circuits
Filling of the system, including the outdoor unit, is car-
ried out via the commissioning assistant and is menu-
guided.
74
!
Please note
Filling and venting the system with the transport
bracket loose can cause damage to the outdoor
unit.
Before filling and venting the system, check
whether the transport bracket is secured: See
page 31.
For further information about fill and top-up water: See
technical guide "Heat pump principles".
We recommend filling the entire system with potable
quality water first.
Treat the heating water with one of the following
options:
■ Direct filling via descaling system while maintaining
the minimum flow rate
■ Filling with purge pump and treated water
Filling with circulation process between flow and
■
return
DHW circuit ("Filling DHW"), integrated buffer cylinder
("Filling defrost buffer") and heating/cooling circuit 1
("Filling climate circuit 1") are filled in turn.