Cooling Mode In Cooling Or Heating Circuit - Viessmann VITOCAL WPR 300 Service Instructions Manual

Heating circuit
(cont.)
Forced heat transfer
Minimum compressor runtimes
increase the efficiency and protect the
components of the heat pump. Sur-
plus heat can be transferred to the
consumers, as soon as they receive a
"transfer signal" from the control unit.
Parameter "Excess reaction" (2011)
determines whether and under what
conditions the heating circuit absorbs
the surplus heat.
Mixer
The mixer is motor-controlled either
directly by the heat pump control unit
with 230 V (M2) or via KM BUS (M3).
The following parameters are avail-
able to match the mixer characteris-
tics to the properties of the heating
system:
& "Flow t excess", 2014
& "Mixer runtime", 2015
& "Mixer active zone", 2018
& "Mixer dead zone", 2019

Cooling mode in cooling or heating circuit

Types and configuration
Cooling mode is possible either with one of the heating circuits installed, or with
a separate cooling circuit, e.g. chilled ceilings or fan convectors. This can be
adjusted in the control unit with parameter "Cooling circuit" (7101).
Note
Cooling mode is not possible with air/water heat pumps (type AW).
Function description
Note
The forced heat transfer for one heat-
ing circuit ends as soon as the maxi-
mum flow temperature "Max. flow
temp" (200E) is reached. For room
temperature-dependent control, the
limit for forced heat transfer is calcu-
lated by adding "Room t standard"
(2000) and "Room t excess" (2012).
Note
For software reasons, the parameters
in the control unit are available for all
heating circuits, including those with-
out mixer. Parameters 2014, 2015,
2018 and 2019 can be specified for
the direct heating circuit, but have no
effect.
Note
Parameters 2015, 2018 and 2019
have no influence on mixer motors
which are controlled via KM BUS.
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