Electric installation
AirModule 6 720 813 268(2014/10)
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8.3
Printed circuit board handling
Circuit boards with control electronics are sensitive to discharges of
static electricity (ESD – ElectroStatic Discharge) when handled. To
prevent damaging the components, special care is therefore required
when handled.
Fig. 20 Antistatic wrist strap
Damage is usually latent, and a circuit board can operate correctly
during commissioning but show signs of problems later. Charged
objects may only be problematic if they are in close proximity to the
electronics. Keep a distance of at least one metre from expanded
polystyrene, protective plastic and other packaging, synthetic material
(e.g. fleeces) and similar before starting work.
A method for good ESD protection is a ground-connected bracelet when
handling electronics. This bracelet must be put on before opening the
screened metal bag/packaging or before exposing an installed board.
The bracelet must be worn until the circuit board is enclosed in its screen
packaging or closed electric box. Replaced, returned circuit boards must
be handled in the same way.
8.4
External connections
To avoid inductive interference, all low voltage conductors (measure
current) should be installed with a minimum distance of at least 100 mm
from the conducting 230V- and 400V cables.
If the temperature sensor conductor has to be extended, the following
conductor diameters should be used:
• Up to 20 m long cable: 0.75 to 1,50 mm
2
• Up to 30 m long cable: 1.0 to 1,50 mm
2
The relay output PK2 is active during cooling and can be used to manage
the exchange between cooling /heating of a fan convector or a
circulation pump or to regulate floor heating circuits in moist rooms.
Output VC0 is active during cooling and is used to manage a 3-way valve
to recirculation, to facilitate the exchange between DHW heating and
cooling.
8.4.1
External outputs
External inputs I1, I2, I3 and I4 can be used to remotely manage certain
functions in the user interface.
The functions that are activated by the external inputs are described in
chapter 12.1.2.
The external input is connected either to a power switch for manual
activation or to operating equipment with a relay output for 5 V.
8.5
Accessories
CAN-BUS connected accessories, e.g. power guard, are connected to
the installer card in the heat pump module parallel on the CAN-BUS
connection to the heat pump. They can also be connected in series with
other CAN-BUS connected units.
8.6
Connecting the heat pump module
▶ Remove the front panel.
▶ Remove the electric box cover.
▶ Feed the connecting cables through the cable feed in the ceiling and
to the electric box. Use an extension spring, if required.
▶ Feed the cables so that the electric box can be tilted forward.
▶ Connect the cables according to the circuit diagram.
▶ Put the electric box cover and the heat pump module front panel
back.
Fig. 21 Cable feed
[1]
Cable bus electrical connection
[2]
Cable bus CAN-BUS and sensor
CAUTION:
Damage due to static electricity!
▶ Wear a grounded antistatic wrist strap when
handling unenclosed printed circuit boards.
Relay output max. load: 2A, cos
>0.4. Higher load
requires installation of an intermediate relay.
6 720 614 366-24.1I
NOTICE:
Damage due to incorrect connection!
Connections intended for a different voltage or current
can damage electrical components.
▶ Only add connections to the heat pump module
external outputs that are compatible with 5 V and 1
mA.
▶ If an intermediate relay is required, use only relays
with gold-plated plugs.
6 720 809 156-23.2I
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