Type Wwks: Solar Thermal System; Maximum Collector Area And Sizing Information; Connecting Solar Collectors - Viessmann VITOCAL 060-A Installation And Service Instructions Manual

Connections on the DHW side
The safety assembly to DIN 1988 is available as an
accessory. The safety assembly contains the following
components:
■ Shut-off valve
■ Diaphragm safety valve
Non-return valve and test connector
■
Pressure gauge connector
■
Information on drinking water filter
According to DIN 1988-2, a drinking water filter must
be installed in systems with metal pipework. We also
recommend the installation of a drinking water filter
when using plastic pipes, according to DIN 1988, to
prevent contaminants entering the DHW system.
Information on the thermostatic mixing valve
The DHW heat pump can heat drinking water to above
60 °C. Therefore, as a protection against scalding, a
thermostatic mixing valve must be fitted in the DHW
pipe.
Information on the safety valve
If no safety assembly to DIN 1988 is installed, equip
the system with a type-tested diaphragm safety valve
as protection against excess pressure.
Installation information:
■ Install the safety valve in the cold water line. Ensure
it cannot be shut off from the DHW cylinder.
There must be no restrictions in the pipework
■
between the safety valve and the DHW cylinder.

Type WWKS: solar thermal system

Maximum collector area and sizing information

DHW heat pump technical guide

Connecting solar collectors

Solar collector installation instructions
For connections to the DHW heat pump, see pages 9
and 21.
Note
■ The cylinder temperature sensor is fitted at the fac-
tory.
A high limit safety cut-out (accessories) for stopping
■
the solar circuit pump must be fitted.
High limit safety cut-out (accessories) installa-
tion instructions
(cont.)
Never seal off the safety valve discharge pipe.
■
Ensure that any expelled water is safely and visibly
drained into a drainage system. Position a sign close
to the safety valve discharge pipe, or ideally on the
safety valve itself, with the following inscription: "For
safety reasons, water may be discharged from the
discharge pipe during heating. Never seal off."
Install the safety valve above the top edge of the
■
DHW heat pump.
Technical requirements:
■ Permissible temperature: 65 °C
Permissible operating pressure 10 bar (1 MPa)
■
AT: 6 bar (0.6 MPa)
■ Test pressure: 16 bar (1.6 MPa)
■ Connections:
Cold water, DHW, DHW circulation: R ¾
Heating water flow, heating water return: G 1
CH: Additional requirements:
When connecting the DHW cylinder to the DHW
■
installation, observe all applicable local and national
standards and SVGW regulations.
■ According to SVGW regulations, installation of
expansion vessels in DHW pipework is not permit-
ted.
Always install the type EA non-return valve between
■
the last shut-off valve and the safety valve in the
DHW cylinder flow direction.
Note
In outdoor air mode, the immersion heater (accesso-
ries) is essential.
Installation sequence
19