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 L8 SPLIT/L12 SPLIT 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
RFV SPLIT, sensor for changing the room temperature
An external sensor (BT50) can be connected to HM 8-12
SPLIT to change the supply temperature and in this way
change the room temperature, for example, a room sensor
(RFV SPLIT, accessory). Connect the sensor to the terminal
block from X4:1 to X4:3 on the load monitor board (AA22).
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 RFV
SPLIT and is shown in menu 6.3.
Contact for changing the room temperature
Climate system 1:
An external contact function can be connected to HM 8-12
SPLIT to change the supply temperature and, in this way,
change the room temperature, for example, a room ther-
mostat 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 HM 8-12
SPLIT to change the supply temperature and, in this way,
change the room temperature, for example, a room ther-
mostat 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 HM 8-12
SPLIT to activate "Temporary extra hot water" function.
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 70 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
HM 8-12 SPLIT 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 HM 8-12 SPLIT is active.
The accessory HS SPLIT can be used if the connection out-
put exceeds 50W. See section Component positions on
page 78.
External shunt (accessory)
Connection and function are described in the Installation
instructions for accessory MG2 SPLIT.
Shuttle valve, cooling (accessory)
Connection and function are described in the Installation
instructions for accessory VK2 SPLIT.
SPLIT38
For the Installer
Electrical installation
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