Chapter 3 Electrical Installation 39
Liebert.PEX2 Series Air Conditioner User Manual
When two condensers with single system are used to match an indoor unit with double system, the digital signals of
dry contacts J6 on the board corresponding to compressor systems 1# and 2# are respectively connected with the
control terminals 70#/71# and 70A#/71A# of the indoor unit.
When a condenser with double system is used to match an indoor unit with double system, you should 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#.
For the detailed connection, refer to
3.3.2 Connecting Power Cables Of Outdoor Unit
The power cables of the outdoor unit are connected with the miniature circuit breakers (MCBs) reserved in the indoor
unit (see Figure 4-1, Figure 4-2 and Figure 4-3).
3.4 Installation Inspection
After the electrical installation is completed, you should confirm it according to Table 3-2.
Table 3-2 Installation Inspection
Items Results
The power supply voltage meets the rated voltage on the unit nameplate
The system electric loop has no open circuit or short circuit
Power cables and ground cables to the circuit breakers, indoor unit and
outdoor unit are well connected
The ratings of the circuit breakers and fuses are correct
The control cables are well connected
All the cables connections are fastened, with no loose screws
After confirming the preceding points, you can start the commissioning.
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