38 Chapter 3 Electrical Installation
The number of the sensors in parallel connection is not limited, but each unit has only one water-under-floor alarm.
Remote shutdown
Three remote shutdown interfaces are provided in the unit and they are shorted in the factory.
Remove the shorting line between 37# and 38# and connect them to the first remote shutdown switch.
Remove the shorting line between 37B# and 38B# and connect them to the second remote shutdown switch.
Remove the shorting line between 37C# and 38C# and connect them to the third remote shutdown switch.
Smoke detecting
Terminals 91#, 92# and 93# can be connected to the optional smoke sensor. The terminal 91# is a common terminal,
the terminal 92# is a normally open (NO) contact and the terminal 93# is a normally closed (NC) contact. You can
select NO or NC contact according to the configured smoke sensor logic.
Terminals 80# and 81# are used to connect the external alarm output of the smoke sensor.
Control signals of outdoor unit
Terminals 70 & 71 and terminals 70A & 71A are two pairs of control signal input terminals of the outdoor unit. Their on
and off state is the same as that of the compressor.
Customized alarm
Terminals 50#, 51# and 55# can be connected to three kinds of sensors, including smoke sensor and
water-under-floor sensor. Terminal 24# is their common terminal. After the customized terminals are connected with
external alarm signals, you should set the corresponding customized alarm through the iCOM controller. See
for details.
When the contact is open and no external alarm is generated, the input state of the customized terminal is open. But
when the contact is closed and the external alarm is generated, the input state of the customized terminal will be
shorted. At this point, the air conditioner system will generate an audible alarm, and the LCD of the iCOM controller will
display the alarm information.
The terminals can be defined as follows:
Terminals 50# and 24#: remote alarm.
Terminals 51# and 24#: water-under-floor sensor (in factory).
Terminals 55# and 24#: safe switch for condensate pump (optional).
External common alarm
Terminals 75# and 76# can be connected to the external common alarms. They are controlled by the external alarm
relay K3 on the circuit board. They output signals to external alarm devices, such as alarm indicator. When critical
alarm occurs, the contact will be closed to trigger remote alarms, send signals to the building management system or
dial the paging system automatically. The power supply of the external common alarm system is user-prepared.
For the detailed definition of other terminals, refer to
3.2.4 Connecting Solenoid Valve Of Pipe Extension Kit (Options, For Site Installation)
The solenoid valve of the pipe extension kit has two connection cables. The two cables are control cables, which are
used to connect with the corresponding terminals of the control board. Note that the solenoid valve cables of 1#
system and 2# system in double system unit should be remarked separately to avoid wrong connection. For detailed
connection terminals, refer to LLSV1 and LLSV2 connection terminal No. in
3.3 Wiring Of Outdoor Unit (For Air-Cooled Series)
3.3.1 Connecting Control Signal Cables Of Outdoor Unit
Open the sealed panel of the electric control box reveals the fan speed controller board (board for short), according to
the cable connection instructions in
Liebert.PEX Condenser User Manual
.
When a condenser with single system is used to match an indoor unit with single system, the digital signal of dry
contact J6 on the board (see
3.1 Work Introduction And Installation Notes
) is connected with the control terminals
70#/71# (see Figure 3-6) of the indoor unit.
Liebert.PEX2 Series Air Conditioner User Manual
Содержание Liebert PEX Series
Страница 1: ...User Manual ...
Страница 5: ......