Viessmann VITOTRONIC 200 - Page 85

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As in active cooling mode, defrosting involves reverse
operation of the heat pump. This is why the hours run
for defrosting are logged with the "AC" hours run in
the daily log.
Active cooling mode ("Active cooling")
Active cooling mode: see "Cooling functions".
System version
The system version describes the components of your
heating system, such as a heat pump, heating circuit
pump, mixer, valves, control unit, radiators, etc.
Your contractor will adjust the heating system to the
local conditions and customise the system to suit your
requirements.
Your contractor will have listed the equipment and
functions of your heating system in the form on
page 97.
Operating program
The operating program enables you to define the fol-
lowing:
■
How you heat or cool your rooms
■
Whether you heat DHW
■
Which ventilation stage is active for your mechanical
ventilation
Operating status
See "Time program".
Pressure imbalance
A pressure imbalance can occur in rooms in conjunc-
tion with controlled mechanical ventilation if the air flow
rate settings are not balanced.
In this context, a pressure imbalance occurs when the
air flow rate on the supply air side is different to that on
the extract air side. In the case of highly airtight build-
ings, this creates either negative or positive pressure
in the interior. With negative pressure, windows and
doors bang open; in the case of positive pressure, win-
dows and doors easily fall shut.
Utilisation of power generated on site
When utilising power generated on site, the power
generated by the photovoltaic system is used to oper-
ate the heat pump and other heating system compo-
nents.
Your contractor has connected an electricity meter
(energy meter) to the heat pump control unit for the uti-
lisation of power generated on site. It supplies the heat
pump control unit with information about whether and
how much power is available from the PV system.
Display on electricity meter
Energy supplied by the grid (power supply utility):
■
The electricity meter shows the output with a minus
sign in front of it:
Fig. 63
Note
Up to 3 fault bars are displayed on the electricity
meter. This does not affect the function of the heat
pump control unit.
Appendix
Terminology (cont.)
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