25
Wiring diagram Accessory unit
Connecting to the power supply
Open
Strap
Close
To Control cabinet To Control cabinet
Do1: Starting additional heat (oil-Þ red boiler/electric element) heating system.
PLEASE NOTE: Maximum relay output load, 1800W resistive, 600W inductive,
cos
ϕ >0,4. At greater loads, an intermediate relay must be installed, not
included.
H1: Any additional heat alarms. Closing during operation causes alarm Fault on
additional heat heating system.
Q2: Mixing valve.
S4: Switch emergency operation (starting oil-Þ red boiler/electric element)
Function Emergency operation:
Switch S3 on the control cabinet starts the heating system’s pump G3 and
heat carrier pump G2.
Switch S4 on the accessory unit is used for starting the oil-Þ red boiler or the
electric element.
If the emergency operation function is to be used, the pre-installed cables
from switch S4 must be connected to the OPB circuit board according to wiring
diagram (L and Do1).
NOTE! An electric element must have overheat protection with built-in
thermostat.
S1 must be in "Term" position on
the Þ rst and last circuit board in
the CANbus loop.
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