An external circulation pump is connected to the AUX
output, as illustrated below.
AA3-X7
C NO NC
1 2 3
External
VVM225
Circulation pump
Integrated active cooling in 4-pipe system
Integrated active cooling in 4-pipe system with air/water
heat pump is activated via soft output.
Active cooling is produced by the air/water heat pump’s
compressor.
When cooling in a 4-pipe system has been selected as
soft output, menu group 1.9.5 is displayed and "cooling"
must be activated for the air/water heat pump in menu
5.11.X.1, or with a DIP switch on the air/water heat
pump in order to determine that it is to perform cooling.
Operating mode cooling is activated by the temperature
of the outdoor temperature sensor (BT1) and any room
sensor (BT50), room unit or separate room sensor for
cooling (BT74) (if two different rooms are to be heated
or cooled at the same time, for example.) When cooling
is required, the cooling reversing valve (EQ1-QN12) and
the cooling circulation pump (EQ1-GP12) in the indoor
module (VVM) are activated.
Cooling production is regulated according to the cooling
sensor (BT64) and a cooling set point value that is de-
termined by the selected cooling curve. Cooling degree
minutes are calculated based on the value on the extern-
al temperature sensor (BT64) for cooling out and the
cooling set point value.
If the “active cooling 4-pipes” accessory has been activ-
ated, the function is switched off. Cooling is then oper-
ated from the accessory instead.
NIBE VVM 225Chapter 5 | Electrical connections32
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