Manual Part 7

Heat Exchanger Climate Unit
• AC power
• Fans
• Temperature sensors
• Other equipment
The front panel contains the following:
• Indicators
• Con nectors for the Environmental and Power Control (EPC) bus
• Con nectors for test and control
4.4 AC/DC Co nverter
The AC/DC converter is used wh en +24 V DC power supply is shut off. It
chang es the mains voltage to +24 V DC to supply the interna l air c ircuit fan, the
extern al circuit fan in the heat exchange r, and the CCU.
4.5 Autotr ansformer
The transformer converts different AC main s input voltages to 230 V AC for
feedin g the heater, the A C/DC converter and fans.
The transformer has windings for mains input voltages of 200, 208/220, 230,
240 and 250 V AC. The mains voltage is selected with the Voltage Selector
Swit ch.
Con nection to 120 V AC is made between phases with 208 V AC selected.
Other voltages are connected between phase an d neutral.
6 (8)
E
N/LZT 720 0311 Uen R2A