Nibe ACVM 270, Installation And Maintenance Instructions Manual

Page: 34 / 96

A current sensor should be installed on each incoming
phase conductor in to the distribution box to measure the
current. The distribution box is an appropriate installation
point.
Connect the current sensors to a multi-core cable in an
enclosure next to the distribution box. Use unscreened
multi-core cable of at least 0.50 mm
2 , from the enclosure
to ACVM 270.
In ACVM 270 connect the cable to the load monitor board
(AA22) on terminal block X1:8–11.
L1 connects to X1:8 and X1:11.
L2 connects to X1:9 and X1:11.
L3 connects to X1:10 and X1:11.
X1:11 is the common terminal block for the three current
sensors.
1 2 3 4 5 6 7 8
AA22-X1
L1
L2
L3
9 10 11 12 13 14 15 16 17
The size of the property's main fuse is set using the knob
(R24) on the circuit limiter board, (AA22). The setting can
be read in menu 8.3.1.
Connection of centralised load control/tariff
In those cases centralised load control or tariff control is
used this can be connected to the terminal block (X1) on
the EBV board (AA22), which is positioned behind the
front cover.
Tariff A, the electric additional heat is disconnected. Con-
nect a potential-free contact function to terminal block
X1:5 and X1:7.
Tariff B, the compressor in AMS 10 has to be disconnected.
Connect a potential-free contact function to terminal block
X1:6 and X1:7.
Tariff A and Tariff B can be combined.
A closed contact results in the electrical output being dis-
connected.
Connecting external contacts
RG 10, sensor for changing the room temperature
An external sensor (BT50) can be connected to ACVM 270
to change the supply temperature and in this way change
the room temperature, for example, a room sensor (RG
10, accessory). Connect the sensor to the terminal block
from X4:1 to X4:3 on the load monitor board (AA22) ac-
cording to the wiring diagram.
Activated in menu 9.3.6.
The difference between the room temperature and the
set room temperature affects the supply temperature. The
desired room temperature is set using the knob on RG 10
and is shown in menu 6.3.
Contact for changing the room temperature
Climate system 1:
An external contact function can be connected to
ACVM 270 to change the supply temperature and, in this
way, change the room temperature, for example, a room
thermostat or a timer. The contact must be potential-free
and non-locking and must be connected to terminal block
X1:3 and X1:4 on the load monitor board (AA22).
When the contact is closed, the offset heating curve is
changed by the number of steps selected. The value is
adjustable between -10 and +10. The value for the change
is set in menu 2.4, "External adjustment".
Climate system 2:
An external contact function can be connected to
ACVM 270 to change the supply temperature and, in this
way, change the room temperature, for example, a room
thermostat or a timer. The contact must be potential-free
and non-locking and must be connected to terminal block
X1:14 and X1:15 on the load monitor board (AA22).
When the contact is closed, the offset heating curve is
changed by the number of steps selected. The value is
adjustable between -10 and +10. The value for the change
is set in menu 3.5, "External adjust. 2".
Contact for activation of “Extra hot water”
An external contact function can be connected to
ACVM 270 to activate "Temporary extra hot water" func-
tion. The contact must be potential-free and non-locking
and connected to terminal block X6:1 and X6:2 on the
load monitor board (AA22).
When the contact is closed for at least one second, the
“Temporary Extra hot water” function is activated. An
automatic return to the previously set function occurs after
3 hours.
Alarm outputs
External indication of common alarms is possible by means
of the relay function on the load monitor board (AA22),
terminal block X2:1–2.
Electrical circuit diagram on page 66 shows the relay in
the alarm position.
When switch (SF1) is in the " 0" or “ ” position the relay
is in the alarm position.
Docking specific connection
ACVM 270 is prepared to control an external circulation
pump (GP10), external shunt (QN11), exchange valve for
cooling (QN12), as well as external additional heat e.g. oil,
gas or pellets.
External circulation pump (max 50W)
External circulation pump (GP10) is connected to terminal
block X3:1 (230 V), X3:4 (N) and X3:5 (PE).
The circulation pump (GP10) is active when the circulation
pump (GP1) in ACVM 270 is active.
The accessory HR 10 can be used if the connection output
exceeds 50W. See section Component positions on page
73.
External shunt (accessory)
Connection and function are described in the Installation
instructions for accessory ESV 22.
Shuttle valve, cooling (accessory)
Connection and function are described in the Installation
instructions for accessory VCC 22.
NIBE™ SPLIT ACVM 270 34
For the Installer
Electrical installation