Viessmann VITOCAL 222-G Operating Instructions Manual page 56

Appendix
Terminology
(cont.)
Weather-compensated heating or
cooling mode
In weather-compensated mode, the flow
temperature is controlled subject to the
outside temperature. This means that no
unnecessary heat or cooling capacity is
generated to heat or cool the rooms to
the set room temperature you selected.
The outside temperature is captured and
transferred to the heat pump control unit
by a sensor fitted outside the building.
DHW circulation pump
The DHW circulation pump transfers the
hot water in a circular line between the
DHW cylinder and the draw-off points
(e.g. hot water tap). This makes hot
water available quickly at the draw-off
point.
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