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8
POWER SUPPLY
DANGER: From electric shock!
B Prior to connecting the power supply,
isolate the heating system from the
mains power.
WARNING: The system will be damaged if
the power is switched on without it being
filled with water.
B Fill the DHW cylinder, pressurise it and
fill the heating system. Then switch on
the power supply.
CAUTION: The PCB can be damaged
through electrostatic discharge. This can
cause faults in the electronic components.
B Handle PCBs with the greatest care.
Check that the cable and board are OK. To prevent
inductive influences, route LV cables separately from
cables carrying 230 V or 400 V (minimum 100 mm
apart).
Residual current device (RCD): If the heating system
should be connected via an RCD, provide a separate
RCD for this purpose (300 mA fire safety response
current). Observe all applicable regulations.
CONNECTING THE TEMPERATURE SENSOR,
INTERNAL UNIT
B Install outside temperature sensor T2.
B Connect the power supply (
B Fit the safety switch.
B Connect the primary heating circuit pump G2.
B Install accessories.
8.1
ACCESSORY
Install Room temperature sensor T5: in the lead room of
the building. Connection in accordance with (
chapter 8.4.3).
Fit and connect a heater cable to the drain pipe (
chapter 8.3.1) to prevent ice forming on the heat pump
drain pipe.
8.2
EMERGENCY OPERATION
The system is able to operate in emergency mode. The
heat generation is taken over by the electric additional
heat if the control unit experiences a fault. See the
operating instructions for further information regarding
emergency mode.
6 720 641 467 (2010/01)
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chapter 8.4.2).
On the IOB board, there is a thermostat for regulating
the flow temperature in emergency mode. At the factory,
the thermostat is set to 35 °C. This standard setting
applies to systems with underfloor heating. If a house is
exclusively heated by radiators, this setting may be
raised to 55 °C.
A switch, S2, is mounted on the control panel; this
switch activates emergency mode.
Fig. 22 IOB board
POWER SUPPLY
21
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