Chapter 3 Electrical Installation 27
Liebert_DM 16kW Air Conditioner User Manual
J9
J3
(
HP1
)
J4
(
HP2
)
J14
(
HP2
)
J15
(
HP1
)
J5
(
Out Temp
)
J11
(
RS232
)
J7
(
Fan1Sta
)
J10
(
Fan2Sta
)
J6
(
CompSta
)
W
V
U
L3
L1
L2
PE
J8
(
SCRTemp)
J17
J18
J1
D16
D22
D15
LCD and keys
Figure 3-6 Layout of wiring terminals
Table 3-3 Definitions of wiring terminals
Silk print
Definition
Definition of pins
J1
AC I/O terminal
PE: protection earth
L1, L2, L3: three-phase AC input
U, V, W: three-phase AC output, which connects with the
power supply terminals
The middle terminal pin without logo is reserved
J9
Passive dry contactor relay output (for the
power switch of fan power supply contactor)
Pin 1: normally closed terminal of relay, which is reserved
Pin 2: common terminal of relay, which is used for AC input
Pin 3: normally open terminal of relay, which is used for AC
output
J3 (HP1)
Input terminal of voltage pressure sensor 1
(spare)
Pin 1: positive terminal of 5V power
Pin 2: input terminal of 0.5V ~ 4.5V pressure voltage signal
Pin 3: negative terminal of 5V power
J4 (HP2)
Input terminal of voltage pressure sensor 2
(spare)
J15 (HP1)
Input terminal of current pressure sensor 1
Pin 1: positive terminal of 12V power
Pin 2: input terminal of 4mA ~ 20mA pressure current signal
J14 (HP2)
Input terminal of current pressure sensor 2
J17, J18
Shorting jumpers of current pressure sensor
Current pressure sensor: the short circuit ring must be installed
on the shorting jumpers
Voltage pressure sensor: the open state of short jumpers must
be kept
J5 (Out Temp)
Input terminal of environment temperature
sensor (spare)
Pin 1: input terminal of temperature signal
Pin 2: signal ground
J11 (RS232)
Serial communication interface (used for
maintenance)
Pin 1: communication ground
Pin 2: reception terminal of communication
Pin 3: transmission terminal of communication
J7 (Fan1Sta)
Detecting terminal of fan 1 over temperature
state
Pin 1: output terminal of 19V AC signal
Pin 2: return terminal of 19V AC signal
J10 (Fan2Sta)
Detecting terminal of fan 2 over temperature
state
J6 (CompSta)
Detecting terminal of compressor state
Note :
J8 (SCRTemp) in Figure3-6 is the interface of fan speed controller board, and not to be used by users
3.3.3 Installation Inspection
After the electrical installation is completed, you should check and confirm that:
1. The power resource voltage meets the rating on the nameplate.
2. The system electric loop has no open circuit or short circuit.
3. Power cables and grounding cables are connected to the circuit breakers, indoor unit and outdoor unit.
