Ericsson RBS 2106 Hardware Reference Manual page 355

Heat Exchanger Climate Unit
Because ambient air is used on the 'cool' side of the heat exchanger, cooling
capacity is limited to the temperature outside the cabinet. If the ambient
temperature is higher than the cabinet return air temperature, the external air
circulation fan will stop to prevent the outside air warming the cabinet.
4.2 Heater
The heater is placed in the internal air circuit. It operates at cold start-up,
heating the inside air when the temperature inside the cabinet is below +5°C.
The heater is not normally at any point other than cold start-up.
The heater is powered by AC mains voltage and is controlled by the Climate
Control Unit. Its two heating coils have a total capacity of 2 kW.
4.3 Climate Control Unit
The Climate Control Unit (CCU) is a processor-based plug-in unit, controlling
and supervising the climate unit. The CCU provides the following main
functions:
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Parameters
The CCU has a set of default operating parameters, which can be overridden
by loaded parameters. These are sent to the CCU through the EPC-bus.
Parameters which can be changed are the following:
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EN/LZT 720 0311 R1A
Monitors internal and external temperatures
Monitors and controls the internal and external fans
Monitors and controls the compressor
Monitors and controls the condensor fan
Monitors and controls the heater
Handles alarms
Supervises Mains Voltage
Tests the Heat Exchanger Climate Unit
Temperature range for linear speed control of internal fan
Temperature range for linear speed control of external fan
Temperature range for heater on and off
Climate Unit for RBS 2106
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