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Heater
The heater is placed in the internal air circuit and heats the air if the
ambient temperature is too low for start up.
Climate Control Unit (CCU)
The CCU is a processor based plug-in unit, controlling and supervising
the climate unit. It has a set of default operating parameters, which can
be overridden by loaded parameters. The backplane connectors contain
the climate unit internal interfaces to DC power, AC power, fans,
compressor, temperature sensors, and so on.
The front panel contains indicators, connectors for the EPC-bus and a
25-pole D-sub connector for test and control.
DC/DC Converter
The DC/DC converter converts +24 V DC to -48 V DC for supply of
the DC fans and the CCU.
AC/DC Converter
The AC/DC converter converts mains voltage to -48 V DC for supply
of the DC fans and the CCU.
Transformer
The transformer converts different AC mains voltages to 230 V AC for
feeding of fans, heater, compressor and AC/DC converter.
20.1.2
Functions
The Combined climate unit consists of a heat exchanger and an active
cooler. At moderate ambient temperature, only the heat exchanger is
used to cool the cabinet. At higher ambient temperatures, the active
cooler will start up to contribute to the cabinet cooling. The heat
exchanger and the active cooler will co-operate in such a way that the
long time average power consumption will be minimised.
If the ambient temperature is higher than the cabinet return air
temperature, the external air circulation fan in the heat exchanger will
stop to prevent the outside air to warm the cabinet.
A heater is included in the climate unit. The heater will operate at cold
start-up, when the outside temperature is lower than the minimum
operating temperature. The heater will normally not operate after cold
start-up.
The combined climate unit also contains a Climate Control Unit (CCU)
and Power Supply.
Heat Exchanger
The outside air circulates through one side of the heat exchanger and
the inside air circulates through the other side. DC-powered fans force
the air through the heat exchanger. The inside air is cooled by the
outside air.
EN/LZT 720 0008
P2A
2001-11-28
Unit Description, RBS 2106 Climate Unit
© Ericsson Radio Systems AB
— All Rights Reserved —
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