Viessmann Vitocal 300 AWO-M-AC 301.A, Installation And Service Instructions Manual

Page: 14 / 152

14
Positioning requirements
■ Provide a manual drain of the heating
water flow and return lines in any area
at risk from frost.
If the heat pump control unit and heat-
ing circuit pump are ready for opera-
tion, the frost protection function of the
heat pump control unit is enabled.
Drain the system if the heat pump is
shut down or there is a prolonged
power failure.
On heat pump systems where a power
failure cannot be recognised (holiday
home), operate the heating circuit with
a suitable antifreeze or drain it.
■ To prevent air "short circuits" and
higher sound emissions through
reflection, avoid installing the equip-
ment in recesses, on building corners
or between two walls. Lawn areas and
vegetation can reduce noise develop-
ment.
Only the heat pump foundations
should therefore be made from rever-
berative material (concrete).
■ Never install the heat pump next to liv-
ing rooms or bedrooms.
■ The air in the outlet section is approx.
10 K colder than the ambient air.
Therefore, black ice could develop in
the outlet area even at [ambient] tem-
peratures above freezing. Clearance
towards paths or patios
≥
3 m.
Note
During defrosting, cool vapour escapes
from both air discharge apertures of the
heat pump. This must be taken into con-
sideration when positioning the appli-
ance (selection of installation location,
heat pump orientation).
Preparing for installation
External heat pump type AWO-M-AC 301.A
5692 875 GB