Vertiv | Liebert PEX4 | User Manual
53
Installation
2.8.9. Wiring of Condenser
• Connecting Control Signal Terminals
:
70#/71# and 70A#/71A# are control signal input terminals for two
circuits of condensers and their switching status are identical with those of the compressor.
• Connecting Control Signal Cables
:
In accordance with the cable connection instructions in the Liebert
Condenser User Manual, open the sealed panel of the condenser‘s electrical control box to reveal the fan
speed controller board. The signal cable connection of condenser is as follows.
• Wiring of a condenser with single system used to match an indoor unit with single system:
The digital
signal of dry contact J6 on the board (refer cable terminals section in Liebert PEX Condenser User Manual
for the locations) is connected with the control terminals 70#/71# of the indoor unit.
• Wiring of two condensers with single system used to match an indoor unit with dual system:
The digital
signals of dry contact J6 on the condenser board corresponding to compressor 1# are connected with the
control terminals 70#/71# of the indoor unit, and the digital signals of dry contacts J6 on the condenser
board corresponding to compressor 2# are connected with the control terminals 70A#/71A# of the indoor
unit.
• Wiring of a condenser with dual system used to match an indoor unit with dual system:
Short the
terminals 70# & 70A# and 71# & 71A#. The digital signal of dry contact J6 on the board can be connected
with the control terminals 70#/71# or 70A#/71A#.
2.8.10. Connecting Power Cables of Condenser
The power cables of the outdoor unit are connected to the MCBs reserved in the condenser (refer
). Liebert PEX4 is configured with the indoor unit matching the two systems- the external power
supply cables and compressor signal cables respectively.
