Emerson Liebert PEX User manual

Next Generation Critical Cooling
for Room and Row
Liebert PEX
Efficiency And Reliability For High Availability Cooling
Condenser
User Manual

Liebert.PEX Condenser
User Manual
Version V1.0
Revision date May 27, 2010
BOM 31011829
Emerson Network Power provides customers with technical support. Users may contact the nearest
Emerson local sales office or service center.
Copyright © 2010 by Emerson Network Power Co., Ltd.
All rights reserved. The contents in this document are subject to change without notice.
Emerson Network Power Co., Ltd.
Address: No.1 Kefa Rd., Science & Industry Park, Nanshan District 518057, Shenzhen China
Homepage: www.emersonnetworkpower.com.cn
E-mail: [e-mail]

Contents
Chapter 1 Overview ............................................................................................................................................................ 1
1.1 Classification And Models ..................................................................................................................................... 1
1.2 Model Description ................................................................................................................................................. 1
1.3 Main Components................................................................................................................................................. 1
1.4 Technical Parameters ........................................................................................................................................... 2
1.4.1 Mechanical Parameters ............................................................................................................................. 2
1.4.2 Mounting Base Dimensions ....................................................................................................................... 3
1.4.3 Parameters Of Operating Environment ..................................................................................................... 4
1.4.4 Parameters Of Storage Environment......................................................................................................... 4
Chapter 2 Installation .......................................................................................................................................................... 5
2.1 Moving, Unpacking And Inspection....................................................................................................................... 5
2.2 Installation Notes .................................................................................................................................................. 6
2.3 Space Requirements ............................................................................................................................................ 6
2.4 Installation Procedures ......................................................................................................................................... 7
Chapter 3 Application Of Fan Speed Controller .................................................................................................................. 9
3.1 Wiring Terminals ................................................................................................................................................... 9
3.2 HMI ..................................................................................................................................................................... 10
3.3 Operation Description Of HMI ............................................................................................................................. 11
3.3.1 Initial Interface ......................................................................................................................................... 11
3.3.2 Main Menu Interface................................................................................................................................11
Chapter 4 Maintenance And Troubleshooting ................................................................................................................... 14
4.1 Maintenance ....................................................................................................................................................... 14
4.2 Troubleshooting .................................................................................................................................................. 15
Appendix 1 Circuit Diagram............................................................................................................................................... 16

Chapter 1 Overview 1
Chapter 1 Overview
This chapter introduces the classification and models, model description, main components and technical parameters
of the Liebert.PEX condenser (condenser for short).
1.1 Classification And Models
The condenser is classified into two types: single circuit and dual circuit. The single circuit has a set of discharge/liquid
pipe to match the single refrigeration system of indoor unit. The dual circuit has two sets of discharge/liquid pipes to
match the two separate refrigeration systems of indoor unit.
The condenser is available in 17 models. The classification and models are listed in Table 1-1.
Table 1-1 Condenser models
Classification Model
Single circuit LS12, LS18, LSF24, LSF32, LSF38, LSF42, LSF52, LSF62, LSF72, LSF76, LSF85
Dual circuit LDF42, LDF52, LDF62, LDF72, LDF76, LDF85
1.2 Model Description
Taking LSF62 for example, the model description of the condenser is shown in Figure 1-1.
LSF62
Model code
SF: single circuit with fan speed controller
Liebert
DF: dual circuit with fan speed controller
Figure 1-1 Model description
1.3 Main Components
The main components of the condenser include the heat exchanger, fan, fan speed controller and pressure sensor.
The heat exchanger is inside the condenser, and the appearance and position of other components are shown in
Figure 1-2 and Figure 1-3.
Fan
ECB: electrical control box (with
a fan speed controller inside)
Isolation switch
Pressure sensor
Figure 1-2 PEX condenser (single fan, single circuit)
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2 Chapter 1 Overview
Fans
Pressure sensors (2 pcs)
Electrical control box (with a
fan speed controller inside)
Isolation switch
Figure 1-3 PEX condenser (double fans, dual circuit)
1.4 Technical Parameters
1.4.1 Mechanical Parameters
The condenser structure is shown in Figure 1-4. The mechanical parameters of each model are listed in Table 1-2.
W
H
L
L
H
Front view Side view
Figure 1-4 Structure (double fans) (unit: mm)
Table 1-2 Mechanical parameters
Dimension (mm)
Model Weight (kg)
Fan diameter
(mm) Fan number L H W
LSF12 80 500 1 924 990 599
LSF18 80 500 1 924 990 599
LSF24 105 710 1 1374 990 689
LSF32 110 710 1 1374 990 689
LSF38 120 800 1 1374 990 695
LSF42 130 800 1 1574 1273 695
LSF52 140 800 1 1574 1273 695
LSF62 150 710 2 1874 1273 689
LSF72 150 710 2 1874 1273 689
LSF76 220 800 2 2374 1273 695
LSF85 230 800 2 2374 1273 695
LDF42 130 800 1 1574 1273 695
LDF52 140 800 1 1574 1273 695
LDF62 160 710 2 2074 1273 689
LDF72 160 710 2 2074 1273 689
LDF76 220 800 2 2374 1273 695
LDF85 230 800 2 2374 1273 695
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Chapter 1 Overview 3
1.4.2 Mounting Base Dimensions
Mounting base dimensions for horizontal installation
The mounting base figure for horizontal installation is shown in Figure 1-5, and the specific mounting base dimensions
of each model are listed in Table 1-3.
DD
L'
D
H'
D
Amplified part figure
D
D
Installation holes
(8 holes in total )
Figure 1-5 Mounting base figure for horizontal installation (unit: mm)
Table 1-3 Mounting base dimensions for horizontal installation (unit: mm)
Model Dimension (L' × H' × D) Model Dimension (L' × H' × D)
LSF12 676 × 837 × 53 LSF76 2126 × 1120 × 53
LSF18 676 × 837 × 53 LSF85 2126 × 1120 × 53
LSF24 1126 × 837 × 53 LDF42 1326 × 1120 × 53
LSF32 1126 × 837 × 53 LDF52 1326 × 1120 × 53
LSF38 1126 × 837 × 53 LDF62 1826 × 1120 × 53
LSF42 1326 × 1120 × 53 LDF72 1826 × 1120 × 53
LSF52 1326 × 1120 × 53 LDF76 2126 × 1120 × 53
LSF62 1626 × 1120 × 53 LDF85 2126 × 1120 × 53
LSF72 1626 × 1120 × 53
Note
The installation holes are long and flat holes. It is recommended to use M10 × 20 bolts to fix the mounting base.
Mounting base dimensions for vertical installation
The mounting base figure for vertical installation is shown in Figure 1-6, and the specific mounting base dimensions of
each model are listed in Table 1-4.
250 102
452
490
a
2020
Figure 1-6 Mounting base figure for vertical installation (top view) (unit: mm)
Table 1-4 Mounting base dimensions for vertical installation (unit: mm)
Model Dimension ‘a’
LSF12, LSF18 830
LSF24, LDF32, LSF38 1280
LSF42, LDF42, LSF52, LDF52 1480
LSF62, LSF72 1780
LDF62, LDF72 1980
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4 Chapter 1 Overview
Model Dimension ‘a’
LSF76, LDF76, LSF85, LDF85 2280
Note
1. The installation holes are long and flat holes. It is recommended to use M10 × 20 bolts to fix the mounting base.
2. The upper condenser must be installed on a rack during vertical installation, and the cushion pads should be installed between
the condenser and the rack for reducing vibration. It is prohibited to stack two condensers through bolt connection.
1.4.3 Parameters Of Operating Environment
Refer to Table 1-5 for parameters of operating environment.
Table 1-5 Parameters of operating environment
Item Requirement
Installation position The standard equivalent distance between the indoor unit and the condenser is 30m. Vertical
difference* ∆H: -5m ≤∆H ≤20m. Installation mode: horizontal or vertical mode
Ambient temperature Outdoor temperature: -20°C ~ +45°C. Low temperature accessories are required if the temperature
is between -35°C and -20°C
Ambient relative humidity Outdoor humidity: 5%RH ~ 95%RH
Operation power 400V ± 10%, 50Hz
Altitude ≤1000m. Derating is required if the altitude exceeds 1000m
Protection level Electrical control box: IP55; unit: IP20; fan motor: IP54
Note*:
Condenser fins have a corrosion resistant coating designed to provide maximum life expectancy for the heat exchanger and
protect the aluminium fins from harsh environments. The high performance coating has been tested for 2000 hours exposure to a
5% neutral salt spray test in accordance with ASTMB117 without impact to the coating
Note
When the equivalent distance between the indoor unit and the condenser exceeds 30m, refer to 5.1 Refrigerant Tubing System
in Liebert.PEX Series Air Conditioner Technical Manual for the requirement of the line equivalent length.
1.4.4 Parameters Of Storage Environment
Refer to Table 1-6 for parameters of storage environment.
Table 1-6 Parameters of storage environment
Item Requirement
Storage environment Clean indoor environment with good ventilation and no dust
Ambient temperature -40°C ~ +70°C
Ambient relative humidity 5%RH ~ 85%RH
Storage time The total storage time should not exceed 6 months. Otherwise, the performance needs to be
re-calibrated
Liebert.PEX Condenser User Manual

Chapter 2 Installation 5
Chapter 2 Installation
This chapter introduces the moving, unpacking, inspection, installation notes, space requirements and installation
procedures.
2.1 Moving, Unpacking And Inspection
Moving
It is recommended to use the mechanical transport equipment such as a forklift or a crane when unloading and
transferring the condenser closest to the installation site.
When a forklift is used, insert the tines of the forklift shown in Figure 2-1 (taking the single fan condenser for example).
Forklift
direction
Figure 2-1 Forklift direction
When a crane is used, refer to Figure 2-2 to lift the package (taking the double fans condenser for example).
Note
When lifting the package, fix the cable by leading it through the slots located at the bottom of the pallet. Otherwise, the cable
may slide during the lifting process, and the package may fall to the ground, damaging the pipes inside and resulting in system
leakage.
Figure 2-2 Crane lifting
Unpacking
Remove the timber frame package and foam of the condenser but reserve the protection cardboard of fins. The
protection cardboard of fins and the cushion pad of U tube located at the end of the condenser should be removed
after the condenser is in its installation position.
Liebert.PEX Condenser User Manual

6 Chapter 2 Installation
Note
1. If the condenser is to be placed horizontally, you should complete the installation of legs while the condenser is located
vertically.
2. When moving the condenser by hand, to avoid distortion and system leakage, do not touch the copper pipes.
Inspection
After the product arrival, you should check the accessories against the packing list. If any parts are found missing or
damaged, please report to the carrier immediately. If any covert damage is found, please report to the carrier and the
distributor immediately.
2.2 Installation Notes
The installation notes of the condenser are as follows:
1. To ensure the heat dissipation capacity, install the condenser in the place with smooth airflow. Do not install it where
the coil of the condenser may be obstructed by dust or snow. Ensure that there is no steam or waste heat around.
2. If possible, the horizontal installation is recommended to reduce the noise.
3. The condenser should be installed away from the residential areas (≥15m).
4. Be careful not to damage the waterproof layer and observe the local regulations when the condenser is installed on
the roof of the building.
5. Position the condenser higher than the indoor unit to ensure normal oil return.
6. Follow the installation arrows on the condenser for correct installation direction.
2.3 Space Requirements
Note
1. A 4000mm clearance is required around the condenser air outlet.
2. 600mm service spaces are required on the four sides of the condenser.
The condenser needs sufficient installation and service space around the installation place. The specific space
requirements are shown in Figure 2-3 and Figure 2-4.
450
Airflow
1200
Airflow
600
Figure 2-3 Horizontal installation space requirement (unit: mm)
4000 600
Airflow
Figure 2-4 Vertical installation space requirement (unit: mm)
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Chapter 2 Installation 7
2.4 Installation Procedures
Note
Before commencing installation hot works, release all nitrogen holding charges from the indoor and outdoor units.
Installing pipelines
Note
1. Protect copper pipes from heat sources. Isolate copper pipes from structures or other obstacles using rigid supports. Avoid dust,
water vapor and irrelevant objects from entering copper pipes.
2. Use a good quality, silver-based solder for all brazed connections. Use refrigeration grade copper pipes and fittings throughout
the installation. Purge all pipes with nitrogen during brazing to prevent oxidation.
1. Identify the pipe sizes
Refer to 2.6 Installing Unit Pipes in Liebert.PEX Series Air Conditioner User Manual for pipe sizes.
2. Identify the condenser installation height
Refer to 2.6 Installing Unit Pipes in Liebert.PEX Series Air Conditioner User Manual for installation height.
3. Install the pipes
Install the pipes according to local and national codes and standards.
Connecting external power (external power supply of the condenser)
1. Identify the cable specifications
Select the power supply cables and start/stop signal cables of the condenser according to site conditions, such as the
distance between the indoor unit and the condenser.
Table 2-1 Operation current of fan under 400V voltage
Condenser Model FLA (A)
LSF12 0.79
LSF18 1.45
LSF24 1.65
LSF32 1.05
LSF38, LSF42, LSF52, LDF42, LDF52 2.4
LSF62, LSF72, LDF62, LDF72 3.3
LSF76, LSF85, LDF76, LDF85 4.8
Note
1. It is recommended to use the 20AWG (0.52mm2) cable as the condenser start/stop signal cable.
2. The outdoor air cooled condenser requires a three-phase, neutral and earth power supply. The indoor PEX unit is the
recommended point of connection for this electrical service and includes a three-pole circuit breaker rated at 16 amps.
3. The cables should not contact hot objects, such as the copper pipe and water pipe without insulation, to avoid damaging the
insulation layers.
4. The cables should be connected in accordance with the local regulations.
2. Connect the cables
See Figure 2-5, Figure 2-6 and Appendix 1 Circuit Diagram for the connections of external power cables.
Liebert.PEX Condenser User Manual

8 Chapter 2 Installation
Waterproof joint of external
power cables by others
Accessing terminal of external
power supply (single fan)
Fan speed controller board
Figure 2-5 Connection figure of single fan external power cables (taking LDF42 for example)
Accessing terminal of external
power supply (double fans)
Fan speed controller board
Waterproof joint of external
power cables by others
Figure 2-6 Connection figure of double fans external power cables (taking LDF62 for example)
Note
1. The external power cables and compressor signal cables enter the electrical control box through the waterproof joint of
external power cable whose inner diameter is Φ10mm.
2. After connecting the external power cables, apply waterproof sealant treatment to ensure the good waterproof performance of
electrical control box.
3. The phase sequence of three-phaseAC input (L1, L2, L3) must be correct. Otherwise, the fan speed controller will generate the
phase loss alarm, and there will be no AC output.
4. For dual circuit condenser (such as LDF42, LDF52, LDF62, LDF72, LDF76 and LDF85), the four condenser start/stop signal
cables should be paralleled at the terminal block of indoor unit before connection; for single circuit condenser, the two condenser
start/stop signal cables can be connected directly.
Charging refrigerant and adding cooling oil
Refer to 2.6 Installing Unit Pipes in Liebert.PEX Series Air Conditioner User Manual for charging refrigerant and
adding cooling oil.
Liebert.PEX Condenser User Manual

Chapter 3 Application Of Fan Speed Controller 9
Chapter 3 Application Of Fan Speed Controller
This chapter introduces the use of the fan speed controller, which includes the definitions of wiring terminals,
introduction of human-machine interface (HMI) and operation of HMI. This chapter is mainly provided for the factory
maintenance personnel. It is recommended that users should not operate the fan speed controller unless necessary.
Note
The configured fan number must be the same as the number of the actual fans, or else a false alarm will be generated. Refer to
Configuration data main menu interface in 3.3.2 Main Menu Interface for detailed settings.
3.1 Wiring Terminals
The wiring terminals are located on the fan speed controller board (see Figure 2-5 and Figure 2-6). Their distribution is
shown in Figure 3-1 and the definitions are listed in Table 3-1. Refer to Appendix 1 Circuit Diagram for detailed
connections.
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 3-1 Layout of wiring terminals
Table 3-1 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)
J4 (HP2) Input terminal of voltage pressure sensor 2
(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
J15 (HP1) Input terminal of current pressure sensor 1
J14 (HP2) Input terminal of current pressure sensor 2
Pin 1: positive terminal of 12V power
Pin 2: input terminal of 4mA ~ 20mA pressure current signal
J17, J18 Jumpers of current pressure sensor
Current pressure sensor: the short circuit ring must be installed
on the jumpers
Voltage pressure sensor: the open status of jumpers must be
kept
Liebert.PEX Condenser User Manual

10 Chapter 3 Application Of Fan Speed Controller
Silk print Definition Definition of pins
J5 (Out Temp) Input terminal of ambient 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
J10 (Fan2Sta) Detecting terminal of fan 2 over temperature
state
J6 (CompSta) Detecting terminal of compressor state
Pin 1: output terminal of 19Vac signal
Pin 2: return terminal of 19Vac signal
Note:
J8 (SCRTemp) in Figure 3-1 is the interface of fan speed controller board, and not to be used by users
3.2 HMI
The fan speed controller operation and setup is provided through indicators, RS232 serial communication port, keys
and LCD.
Indicators
There are three indicators (see Figure 3-1) on the fan speed controller board. See Table 3-2 for the functions of
indicators.
Table 3-2 Functions of indicators
Silk print Definition Color State Function
On The CPU circuit of fan speed controller board is
supplied with 5V power
D16 Power indicator Green
Off The fan speed controller board is faulty
On or off The fan speed controller board is faulty
Blinking at 1Hz (slowly) The system is running normally without alarm
D22 Run indicator Green
Blinking at 5Hz (quickly) There is an alarm or the compressor is shut down
On The control switch which supplies the AC contactor
with the driving power is open
D15 Power switch controlling
indicator of AC contactor Red
Off The control switch which supplies the AC contactor
with the driving power is closed
RS232 serial communication port
The RS232 serial communication port is a port to connect the computer using factory-defined protocol. It is used for
factory commissioning and maintenance.
Keys and LCD
The keys and LCD, which can realize the functions in Table 3-3, provide the HMIs for maintenance personnel. Refer to
3.3 Operation Description Of HMI for operation of keys and LCD HMI.
Table 3-3 Function descriptions of keys and LCD
NO. Function Description
1 Query the acquisition data in real
time
The acquisition data include condensing pressure, ambient temperature, silicon
controlled rectifier (SCR) temperature and output percentage
2 Query the current alarm data in real
time
The current alarm data include phase loss alarm, SCR over temperature, fan 1 over
temperature, fan 2 over temperature, pressure sensor failure, EEPROM read fault
alarm, SCR temperature sensor failure and abnormal frequency
3 Query the historical alarm data in
real time The latest saved 100 historical alarms can be queried
4 Modify the configured parameters in
real time
The configured parameters include running pressure, pressure controlling range,
minimum voltage, maximum voltage, fan number and pressure sensor type; or
resume the default values
Liebert.PEX Condenser User Manual

Chapter 3 Application Of Fan Speed Controller 11
The keys and LCD are on the upper right corner of the fan speed controller board, as shown in Figure 3-1. Their
appearance is shown in Figure 3-2.
LCD
ENT key
DOWN key
ESC key
UP key
Figure 3-2 Keys and LCD
3.3 Operation Description Of HMI
3.3.1 Initial Interface
The LCD will alternately display ‘F01’ (the maximum pressure logo) and the larger of condensing pressure 1 and
condensing pressure 2 when the fan speed controller is powered on initially. However, the pressure value will be
displayed as ‘88.8’ on the LCD if:
1. The pressure sensor is not installed.
2. The jumper cap of current pressure sensor is not installed.
3. The pressure sensor is disabled.
The display order is shown in Figure 3-3 (the ‘16.1’ is only an example, and the actual value is determined by the
sampling result).
F01 16.1 F01 16.1
Figure 3-3 Display order of the initial interface
3.3.2 Main Menu Interface
Press the ESC key on the initial interface, and the main menu interface will appear on the LCD. The main menu
interfaces include the analog main menu interface, current alarm main menu interface, historical alarm main menu
interface and configuration main menu interface. Press the UP key and DOWN key to select a different main menu
interface, and press the ENT key to enter the submenu of the current main menu on the main interface. The switching
operation processes and orders of the main menus are shown in Figure 3-4.
FAHC
DOWN keyDOWN key
DOWN key
UP
key
UP
key
UP
key
DOWN key
UP key
Configuration main
Analog main Current alarm main Historical alarm main
menu interface menu interface menu interface
-
-
-
-
-
-
-
-
menu interface
Figure 3-4 Switching operation processes and orders of the main menus
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12 Chapter 3 Application Of Fan Speed Controller
Analog main menu interface
Press the ENT key to enter the analog submenu interface when the current main menu interface shows ‘F--’ (the
symbol of analog main menu). The switching operation processes and orders of the analog submenu are shown in
Figure 3-5.
ENT key
DOWN key
ESC key
UP key
F-
-
F01
F02
F03
F04
F05
F06
16.1
16.1
.0
-15
60
88
Analog main menu Analog submenu shows
Initial interface
Analog ID definitions
F01: The maximum pressure between the
F02: Pressure 1
F03: Pressure 2
F04: Ambient temperature
F05: SCR temperature
F06: Output voltage percentage
pressure 1 and pressure 2; 88.8 will be
shown when the pressure sensor is disabled
the ID and values circulary
Figure 3-5 Switching operation processes and orders of the analog submenu
Current alarm main menu interface
Press the ENT key to enter the current alarm submenu interface when the current main menu interface shows ‘A--’
(the symbol of current alarm main menu). The switching operation processes and orders of the current alarm submenu
are shown in Figure 3-6.
See Table 4-1 for generating conditions and troubleshooting.
No alarm
Current alarm main
ENT key
ESC key
UP key
DOWN key
Current alarm ID definitions
A00: Phase loss alarm
A01: SCR over temperature
A02: Fan 1 over temperature
A03: Fan 2 over temperature
A04: Pressure sensor failure
A05: EEPROM read fault
A06: SCR temperature sensor failure
A07: Abnormal frequency
A-
-
F-
-
- - - AXX
AXX
AXX
AXX
or
When there is an alarm, the XX of
menu interface
alarm ID is the number from 00
Figure 3-6 Switching operation processes and orders of the current alarm submenu
Liebert.PEX Condenser User Manual

Chapter 3 Application Of Fan Speed Controller 13
Historical alarm main menu interface
Press the ENT key to enter the historical alarm submenu interface when the current main menu interface shows ‘H--’
(the symbol of historical main menu). The switching operation processes and orders of the historical main menu are
shown in Figure 3-7.
H- -
F- -
1.X
2.X
99.X
0.X
Historical alarm ID definitions
1: SCR over temperature
2: Fan 1 over temperature
3: Fan 2 over temperature
4: Pressure sensor failure
6: SCR temperature sensor failure
7: Abnormal frequency
5: EEPROM read fault
0: Phase loss alarm
Historical alarm main
menu interface
ESC key
UP key
DOWN key
-: No alarm
Analog main menu
ENT key
The radix point is the space mark between the number order and
alarm ID. The number is the alarm number and from1 whcih is
the present historical alarm. 0 is the 100th historical alarm. X is
the historical alarm ID. When there is no alarm, '-' will be shown
Figure 3-7 Switching operation processes and orders of the historical main menu
Configuration data main menu interface
Note
The configuration data main menu interface is designed only for maintenance personnel to set parameters, others are prohibited
to operate it.
Press the ENT key to enter the configuration data submenu interface when the current main menu interface shows
‘C--’ (the symbol of configuration data main menu). The switching operation processes and orders of the configuration
data main menu are shown in Figure 3-8.
C01
C02
C03
C04
C05
C06
C99
888
13
4
30
100
1
2
C- -
Configuration main
menu interface
UP key
DOWN key
ESC key
ESC key
ENT key
ESC key
ENT key
ENT key
Configuration ID
selected submenu
Configuration value
changed submenu (using
DOWN and UP keys)
C01: Pressure set Pset
C02: Pressure band Pband
C03: Minimum voltage Vmin
C04: Maximum voltage Vmax
C05: Fan number
C06: Sensor type
C99: Resume the default
Configuration ID definitions
Prompt interface of
successful change
Figure 3-8 Switching operation processes and orders of the configuration data main menu
Liebert.PEX Condenser User Manual

14 Chapter 4 Maintenance And Troubleshooting
Chapter 4 Maintenance And Troubleshooting
This chapter introduces the maintenance and troubleshooting of the condenser. Users should check the condenser
regularly and solve the problems in time.
Note
1. The maintenance of the condenser must be done by technicians.
2. Except for the commissioning items that must be carried out with power-on, during maintenance, the power of the indoor unit
and the air switch of the condenser must be cut off.
4.1 Maintenance
Refrigeration system
1. Check that the refrigeration pipes are firmly fixed. The refrigeration pipes shall not shake with the vibration of wall,
earth or equipment frame. Otherwise, reinforce the refrigeration pipes with fastening objects.
2. Check that there is no oil on the accessories of all refrigeration pipes, and make sure that the pipes do not leak.
Heat exchanger
1. Clean the fin of the heat exchanger regularly.
2. Clean the fin of the heat exchanger with compressed air or fin detergent (weakly alkaline) if the condenser airflow is
blocked. Inverse airflow is good when the compressed air is used.
3. Check for damaged fins and maintain them in time.
4. Avoid snow accumulation around the condenser in winter.
Fan
Check that the fan runs normally. Check it for problems such as abnormal noise, vibration and bearing failure.
Fan speed controller
Check that the fan speed controller board operates normally. If not, replace it as illustrated in the following paragraph.
Note
Note that the positions of the bolt installation holes on the fan speed controller could be different on the actual product.
The fan speed controller is inside the electrical control box (see Figure 1-2 and Figure 1-3). Rotate the isolation switch
to ‘OFF’, and then remove the cover plate of the electrical control box, as shown in Figure 4-1. Remove the cover plate
of the electrical control box before removing the fan speed controller board. Except for the seven bolts in Figure 4-2,
other bolts are prohibited to remove. The bolt 1 and bolt 2, which are used to fix the heat sink on the fan speed
controller board, must be fastened firstly. The heat sink must cling to the floor of the electrical control box. After
installing the heat sink, use other five bolts to fix the fan speed controller board.
ON
OFF
Figure 4-1 Fan speed controller board
Liebert.PEX Condenser User Manual

Chapter 4 Maintenance And Troubleshooting 15
Fan speed controller board
Bolt 2
Bolt 1
散热片
Heat sink
Figure 4-2 Removing the fan speed controller board
4.2 Troubleshooting
See Table 4-1 for alarm troubleshooting.
Table 4-1 Table of alarm troubleshooting
Alarm
number ID Alarm name Cause Troubleshooting
One phase or two phases of three-phase
voltage are lost Check that the three-phase voltage is correct
The input connection is reversed Check the input order of wire
A00 Phase loss
alarm The fan speed controller board has a
hardware fault
Replace the fan speed controller board and compare
the result of two boards
The fan cannot run normally Check that the fan runs normally
A01 SCR over
temperature The fan speed controller board has a
hardware fault
Replace the fan speed controller board and compare
the result of two boards
The fan cannot run normally Check that the fan runs normally
The AC contactor supplying power for fan
has fault or its wire cuts off
Check the wiring of AC contactor; detect the auxiliary
contact state of AC contactor
A02, A03
Fan 1 over
temperature,
Fan 2 over
temperature
The fan speed controller board has a
hardware fault (the detecting circuit or SCR
power supplying circuit has fault)
Replace the fan speed controller board and compare
the result of two boards
The pressure sensor is not installed or its
terminal connection is poor Check the wiring of pressure sensor
Jumper caps are not used to short terminals
J17 and J18 of current pressure sensor
Install the jumper cap when the current pressure
sensor is configured
Pressure sensor failed Replace the pressure sensor and compare the result
of two boards
A04 Pressure
sensor failure
The fan speed controller board has a
hardware fault
Replace the fan speed controller board and compare
the result of two boards
A05 EEPROM
read fault
The fan speed controller board has a
hardware fault
Replace the fan speed controller board and compare
the result of two boards
The SCR temperature sensor is not
installed or its terminal connection is poor
Check the wiring of SCR temperature sensors (J8
SCRTemp, see Figure 3-1 for its position )
SCR temperature sensor failed Replace the SCR temperature sensor and compare
the result of two sensors
A06
SCR
temperature
sensor failure The fan speed controller has a hardware
fault
Replace the fan speed controller board and compare
the result of two boards
A07 Abnormal
frequency
The frequency of power supply voltage is
wrong
The fan speed controller has a hardware
fault
Replace the fan speed controller board and compare
the result of two boards
Liebert.PEX Condenser User Manual

16 Appendix 1 Circuit Diagram
Appendix 1 Circuit Diagram
WU
V
J11 RS232J5 OutTemp J10 Fan2StaJ7 Fan1Sta J6 CompSta
02
Remark:
Black
Contactor 1
Olivine
Wiring terminal
block
Olivine
Shell connecting to
the earth
Air circuit breaker
Olivine
External power
Pressure sensor 2 Pressure sensor 1
Compressor
signal
Red
1. Connect the pressure sensor 1 only, when PEX
condenser is a single circuit.
2. Connect the pressure sensor 1 and 2 with the
copper pipe of PEX condenser, when PEX condenser
is a dual circuit.
3. When mounted vertically, the lower header
connects to pressure sensor 1 and the upper header
connects to pressure sensor 2.
4. Both external power and compressor signal are
wired in field.
5. The compressor signal cables should be in parallel
and then connected into the electrical control board,
when the indoor unit is a dual circuit.
Fan
Isolation switch
Black
Black
BlackBlack
Black Black
Black Black
BlackBlackBlack
Black Black Black
Black Black
Black Black
Black
Red Orange
Black Black
Orange
Orange
Red
Orange
L1
J9 3 2 1 J3 HP1 J4 HP2 J14 HP2 J15 HP1
04
04
L3 L2 L1 PE
03 03 03 L1 04 04 05 02 02 02 01 02
123456
8 9 10 11 12 13
7
14
10 10 10
01 0109
0807
06
06
06
1L1 3L2 A15L3 NO
NOA26T34T22T1
09
01010101
W1
V1
U1
TB
TB
PE
01 01
L3 L2 L1 NPE
Figure 1 Circuit diagram of the condenser with single fan
Liebert.PEX Condenser User Manual

Appendix 1 Circuit Diagram 17
7
6
J3 HP1 J4 HP2 J14 HP2 J15 HP1 J5 OutTemp J11 RS232 J7 Fan1Sta J10 Fan2Sta J6 CompSta
Remark:
1. Connect the pressure sensor 1 only, when PEX
condenser is a single circuit.
2. Connect the pressure sensor 1 and 2 with the
copper pipe of PEX condenser, when PEX
condenser is a dual circuit.
3. When mounted vertically, the lower header
connects to pressure sensor 1 and the upper
header connects to pressure sensor 2.
4. Both external power and compressor signal are
wired in field.
5. The compressor signal cables should be in
parallel and then connected into the electrical
control board, when the indoor unit is a dual circuit.
Air circuit
breaker
External power
Shell connecting
to the earth
Olivine
Black White Orange
Olivine
Black White Orange Olivine
Brown
OlivineBrown
Black Orange Black Orange
Contactor 1 Contactor 2
Fan1 (remote) Fan2
(proximal)
Wiring terminal
block
Compressor
White Brown Orange
Isolation
switch
Black Black Black Black Black Black
Black Black Black BlackBlack
Black Black Black BlackBlack Black
BlackBlack Black
03 Pressure sensor 2
Black Black
L1
J9 3 2 1
Pressure sensor 1 06 10 11
WUV L3 L2 L1 PE
04 04 04 L1 06
12345
10 11
12 13 14
07 07 07 08 09
15 16
05 03 03 03 03
89
17 18
10 10 10
09 09 02 01 02 01
1L1 3L2 A1 5L3 NO 1L1 3L2 A1 5L3 NO
2T1 4T2 6T3 A2 NO 2T1 4T2 6T3 A2 NO
01 01 01 01 09 02 02 02 02 09
01 01 02 02
W1V1 U1
TB
TB
PE
W1V1 U1
TB
TB
PE
L3 L2 L1 NPE
signal
Figure 2 Circuit diagram of the condenser with double fans
Liebert.PEX Condenser User Manual