Manual Part 5

Combined Climate Unit
The heater is powered by mains voltage, an d heats the inside air if the startup
tempe rature inside the cabinet is below -5
C. The heater has a capacity of
2 kW.
The CCU measures the retur n air temperature and controls the heater.
4.4 CCU
The Climate Control Unit (C CU) is a processor-based plug-in unit, controllin g
and supervising the climate unit. The CCU provid es the following main
functions:
• Monitors internal and external tempera tures
• Monitors and controls the internal and external fans
• Monitors and controls the heater
• Han dles alarms
• Supervises mains voltage
• Tests the Heat Exchanger Climate Unit
4.5 DC/DC Co nverter
The D C/DC converter operates on +24 V DC supply from the RBS. The
converter feeds -48 V DC supply to the internal air circuit fan, external air circuit
fan in the heat exchanger and the CCU.
4.6 AC/DC Co nverter
The A C/DC converter co nverts AC mains to -48 V DC supply for the internal air
circuit fan, external air circuit fan in the heat exchanger and the CCU, when
the +24 V DC supply is not present.
4.7 Transformer
The transformer supplies the fans, heater, compressor, and AC/DC conve rter
with 230 V AC, independ ently o f the mains input voltage.
The transformer has windings for mains input v oltages of 20 0, 208/220, 230,
240, and 250 V AC.
6 (10)
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N/LZT 720 0239 Uen R2A