Appliance Description; Heat Pump Control Unit; Commissioning; Terminology - Viessmann PLC VITOCAL 350-HT PRO Operating Instructions For The System User

Introductory information

Appliance description

Heat pump control unit

Depending on the type of heat pump and accessories
installed, your heating system may be equipped as fol-
lows:
■ Heating:
Central heating and, if installed, heating of heating
water buffer cylinders
■ Cooling:
The "natural cooling" and "active cooling" functions
are supported if the required accessories are instal-
led.
Domestic hot water heating:
■
DHW heating using an external DHW cylinder, and
control of a DHW circulation pump are possible.

Commissioning

The commissioning and matching up of the heat pump
control unit to local conditions and to the structural
characteristics of the building, plus the instruction of
the user in operating the system, must be carried out
by your heating contractor.

Terminology

To provide you with a better understanding of the func-
tions of your heat pump control unit, some terminology
is explained.
The terms are marked as follows:

Your system is preset at the factory

The heat pump control unit is not pre-configured at the
factory. Your heating system will be configured by your
heating contractor during commissioning. The follow-
ing operating parameters are set at the factory and can
be adjusted by you:
Central heating/central cooling
■ If a heating water buffer cylinder is installed, it will be
heated.
Domestic hot water heating:
■ During the night, DHW is heated from 22:00 to
05:00 h to 55 °C "Set value, cyl". Any installed
DHW circulation pump is off.
6
Note
These operating instructions also describe functions
that are only available on some heat pump models or
only with accessories. These functions are not specifi-
cally identified.
For questions relating to the extent of functions and
accessories for your heat pump and your heating sys-
tem, check with your contractor.
Further information can be found in chapter
"Terminology" in the appendix.
Additional function of DHW heating
■ Once a week on Saturday between
04:00 and 06:00 h the DHW cylinder is heated to
65 °C in order to kill off any legionella bacteria that
may be present.
Note
In order to reach the required temperature, a booster
heater may be required for the DHW cylinder,
depending on the heat pump.
Frost protection
■ Frost protection for your heat pump, the DHW cylin-
der and any heating water buffer cylinder that may
be installed is ensured.