Electrical Connection; Connecting The Indoor Unit - Bosch Compress 3400i AWS Installation Manual
Indoor unit for air to water heat pump
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- Installation manual (24 pages) ,
- Operation manual (28 pages)
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Installation
Maximum load at the relay output of the pump PC1: 2A, cos> 0.4. If
the load is higher, install an intermediate relay.
5.7
Electrical connection
DANGER
Electrical shock!
The heat pump components conduct electricity.
▶ Before working on the electrical system, disconnect the appliance
from the power supply.
NOTICE
The system will be damaged if it is turned on without water.
If the system is turned on before it is filled with heating system water, the
heating system components can overheat.
▶ Fill, vent and establish the correct operating pressure in the DHW
cylinder and heating system before turning on the heating system.
The indoor unit it is not supplied with its own safety switch from mains
power supply.
▶ For a safe operation, install a disconnection device that provides a
full disconnection under overvoltage category III conditions in the
mains wiring in accordance to the wiring rules.
CAN-BUS and EMS-BUS are not compatible.
▶ Do not connect EMS-BUS unit to CAN-BUS units.
Voltage should not vary more than 10% from the rated voltage.
The voltage between earth and neutral must be below 3V. Attention must
be made when connecting the phases of this appliance in the whole
electrical installation, so there is no phase unbalance in the household 3-
phase system (if there is any).
▶ Select the appropriate conductor cross-sections and cable types for
the respective fuse protection and routing method.
▶ Connect the heat pump according to the wiring diagram.
▶ When changing the PCB, note the colour coding.
When extending temperature sensor cables, use the following conductor
diameters:
• Cable length up to 20 m: 0.75 to 1.50 mm
• Cable length up to 30 m: 1.0 to 1.50 mm
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5.7.1
Connecting the indoor unit
▶ Remove the front cover of the indoor unit.
▶ Remove the cover of the electrical box.
▶ Insert the CAN-BUS, sensors and other signals circuit cables through
the respective cable feed, marked with <50V. Lead the cables all the
way until they reach the front of the appliance and connect them as
indicated in Fig. 10.
▶ Insert the power circuit cables through the glands marked with
230V/400V. Lead them all the way until they reach the front of the
appliance.
▶ Connect the power supply cables in the respective terminal blocks as
indicated in chapter 5.7.7.
▶ Fasten the cable ties.
▶ After assuring all electric cables are correctly and safely connected
and secured, reassemble the electrical box cover and the front cover
of the indoor unit.
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Fig. 10 Cable feeds (bottom and front view)
[1]
Cable feed for power circuit cables (230V/400V)
[2]
Cable feed for sensor, CAN-BUS, EMS BUS and signal circuit
cables (<50V)
[3]
Installer module
[4]
Support for cable ties
[5]
Terminal blocks
[6]
Cable circuit for sensor, CAN-BUS, EMS BUS and signal circuit
cables (<50V)
[7]
Cable circuit for power circuit cables (230V/400V)
[8]
Overheating protection (OHP)
[9]
Relay 1,2 and 3 for electric booster heater
When routing the electrical cables in and out of the electrical box, make
sure they do not become strained.
Compress 3400i AWS – 6721852066 (2023/01)
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0010038297-001
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