Reference Manual

Product Data RBS 2106

• Combined Climate Unit. This has both heating and refrigeration.

• Air-to-Air Heat Exchanger climate unit. This provides heating,

and cooling through forced convection. It has no refrigerating

capacity; the cabinet cannot be cooled to a temperature lower than

that of the outside (ambient) air.

Both types consist of a Climate Control Unit (CCU), a heater, a heat

exchanger, fans and air-ducts. The Combined Climate Unit has in

addition a compressor, condenser, evaporator, reducing valve and an

AC-powered condenser fan, to refrigerate the cooling air.

The CCU monitors temperatures both inside and outside the cabinet. It

provides heating or cooling by controlling the heater and fans (internal

and external); in the Combined Climate Unit it also controls the

compressor and the condenser fan. The CCU also performs alarm

handling and test functions.

P008419A

Combined Climate Unit RBS

CCU DC/DC AC/DC

Transformer

Heater

Sub Racks

Return Air

Supply Air

Heat

Exchanger

Condensor Evaporator

Active

Cooler

Figure 33 Block diagram, Combined Climate Unit

EN/LZT 720 0008 P2A

2001-11-28

91 (485)

Preliminary