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Fig. 9
CAN-BUS connection
[1]
indoor unit
[2]
outdoor unit
5.7.3
Handling printed circuit boards
Printed circuit boards with control electronics are very sensitive to
electrostatic discharge (ESD). To prevent damage to the components,
special care is therefore required.
CAUTION:
Damage due to electrostatic charge!
▶ Wear an ESD wrist strap when handling unenclosed PCBs.
Fig. 10 Wrist strap
The damage is not normally immediately recognisable. A PCB may
function perfectly during commissioning and problems often only arise
later on. Charged objects are only a problem if they are in the vicinity of
the electronics. Observe a safety clearance of at least one metre from
foam rubber, protective film and other packaging materials, and do not
wear clothing made of synthetic fibres (e.g. fleece pullovers) and similar,
when you start work.
An earthed wrist strap offers good ESD protection when working with
electronics. This wrist strap must be worn when opening the screened
metallic bag/packaging or prior to exposing a fitted PCB. The wrist strap
must be worn until the PCB has been placed inside its screened
packaging or has been connected inside the closed control device.
Replaced PCBs that are returned must be handled in this way.
Compress 3000 AWES – 6720892204 (2020/06)
5.7.4
Fitting temperature sensors
In the default setting, the control unit automatically controls the flow
temperature based on the outdoor temperature. A room temperature-
dependent controller can be installed for greater comfort. If cooling
mode is intended, a temperature controller is absolutely essential.
5.7.5
Flow temperature sensor T0
The temperature sensor is part of the scope of delivery of the indoor unit.
▶ Install the temperature sensor 1-2 metres downstream of the 3-way
valve or on the buffer cylinder, if installed.
▶ Connect the flow temperature sensor on the installation module in
the control device of the indoor unit to terminal T0.
5.7.6
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 in the heat
pump. 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 ohm/km
• Number of conductors: 2
▶ Mount the sensor on the coldest side of the house, normally facing
north. The sensor must be protected against direct sunlight,
ventilation air or other factors which could affect temperature
measurement. The sensor may not be installed directly under the
roof.
▶ Connect the outdoor temperature sensor T1to the terminal T1 on the
installer module.
Installation
13
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