Fitting Temperature Sensors; External Connections - Bosch Compress 3400i AWS Installation Manual

5.7.5

Fitting temperature sensors

In the default setting, the control unit automatically controls the flow
temperature based on the outdoor temperature. A room controller can
be installed for greater comfort. If cooling mode is intended, a room
controller is absolutely essential.
Flow temperature sensor T0
The temperature sensor is part of the scope of delivery of the indoor unit.
▶ Install the temperature sensor 1-2 meters downstream of the
junction of the DHW coil circuit, if installed.
▶ Connect the flow temperature sensor on the installation module in
the control device of the indoor unit to terminal T0.
Outdoor temperature sensor T1
A screened cable must be used if the outdoor temperature sensor cable
is longer than 15 m. The screened cable must be earthed to the indoor
unit. The max. length of a screened cable is 50 m.
The cable to the outdoor temperature sensor must meet the following
minimum requirements:
2
• Cable diameter: 0.5 mm
• Resistance: max. 50 /km
• Number conductors: 2
▶ Install the sensor on the coldest side of the house, normally facing
north. The sensor must be protected against direct sunlight, air vents
or other factors which could affect the temperature measurement.
The sensor must not be installed directly under the roof.
▶ Connect the outdoor temperature sensor T1 to the terminal T1 on the
installer module.
Compress 3400i AWS – 6721852066 (2023/01)
Fig. 13 Position of the outdoor temperature sensor
5.7.6

External connections

NOTICE
Material damage due to incorrect connection!
The electrical components may become damaged if connected to the
wrong voltage or current.
▶ Only make connections that are adapted for 5 V and 1 mA to the
external connections of the indoor unit.
▶ If coupling relays are required, only use relays with gold contacts.
The external inputs I1 and I4 can be used for remote control of individual
control unit functions.
Functions which are activated via the external inputs are described in the
instructions for the control unit.
The external input is either connected to a manual switch or a control
device with a 5 V relay output.
Installation
N
NW NE
W E
SW SE
S
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