An external circulation pump is connected to the AUX out-
put, as illustrated below.
L
L
N
N
PE
PE
F1X45
Externt
AA3-X7
C NO NC
1 2 3
External
VVM 310
Circulation pump
AA3-X7
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 circula-
tion pump (EQ1-GP12) in the indoor module (VVM) are activ-
ated.
Cooling production is regulated according to the cooling
sensor (BT64) and a cooling set point value that is determ-
ined by the selected cooling curve. Cooling degree minutes
are calculated based on the value on the external temperat-
ure sensor (BT64) for cooling out and the cooling set point
value.
If the “active cooling 4-pipes” accessory has been activated,
the function is switched off. Cooling is then operated from
the accessory instead.
27
Chapter 5 | Electrical connections
NIBE VVM 310
