Manual Part 7

Heat Exchanger Climate Unit
5 Interf aces
5.1 Signal and Power
The H eat Exchanger Climate Unit has the following external inte rfaces:
• DC power
• AC mains power
• EPC bus (on the CCU)
• Test and gene ra l signals (25-pole D-sub on the CCU)
5.2 Operator Interfa ce
The C CU front panel has the following Man-Machine In terfaces (MMI):
• Test and general signals connec tor
• EPC bus connectors
• Test button
• Indicators
Test and Control Connector
The test and general signals connector is a 25-pole D-sub c onnector.
Table 3 Indicators
Indicato r Des cription
Colour
CCU FAULT Fault Red
OPER ATION Opera tional Green
EPC BUS EPC-bus fault Yellow
HEAT FAULT Hea te r fault Yellow
HE.INT.FAN Hea t exchanger
internal fan fault
Yellow
HE.EXT.FAN Heat exchanger
extern al fan fault
Yellow
PWR.FAULT Power fault Yellow
7 (8)
EN/LZT 720 0311 Uen R2A