Liebert DM, DM Series, DME16 User Manual
Precision Cooling
For Business-Critical Continuity
™
User Manual
Liebert® DM 16kW Air Conditioner
Liebert_DM 16kW Air Conditioner User Manual
Liebert_DM 16kW Air Conditioner
User Manual
Version
V1.0
Revision date
March 5, 2013
BOM
31012820
Emerson Network Power provides customers with technical support. Users may contact the nearest
Emerson local sales office or service center.
Copyright © 2013 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: support@emersonnetwork.com.cn
Liebert_DM 16kW Air Conditioner User Manual
Contents
Chapter 1 Overview ............................................................................................................................................................ 1
1.1 Model Description ................................................................................................................................................. 1
1.2 Product Introduction .............................................................................................................................................. 1
1.3 Main Components ................................................................................................................................................. 1
1.3.1 Indoor Unit ................................................................................................................................................. 1
1.3.2 Outdoor Unit .............................................................................................................................................. 2
1.3.3 Controlling System .................................................................................................................................... 2
1.3.4 Controller ................................................................................................................................................... 2
1.4 Environment Requirements .................................................................................................................................. 3
1.4.1 Operation Environment .............................................................................................................................. 3
1.4.2 Storage Environment ................................................................................................................................. 3
Chapter 2 Mechanical Installation ....................................................................................................................................... 4
2.1 Transportation, Unpacking And Inspection ........................................................................................................... 4
2.1.1 Transportation And Movement .................................................................................................................. 4
2.1.2 Unpacking .................................................................................................................................................. 4
2.1.3 Inspection .................................................................................................................................................. 5
2.2 Installation Notes .................................................................................................................................................. 5
2.3 System Installation Arrangement .......................................................................................................................... 6
2.3.1 General Arrangement ................................................................................................................................ 6
2.3.2 System Installation Sketch Map ................................................................................................................. 6
2.3.3 Mechanical Paremeters ............................................................................................................................. 7
2.4 Installing Indoor Unit ............................................................................................................................................. 9
2.4.1 Preparing Equipment room ........................................................................................................................ 9
2.4.2 Installation Space ...................................................................................................................................... 9
2.4.3 Requirement Of Maintenance Space ....................................................................................................... 10
2.4.4 Installation Procedures ............................................................................................................................ 11
2.5 Installing Outdoor Unit ........................................................................................................................................ 11
2.5.1 Installation Notes ................................................................................................................................ ..... 11
2.5.2 Space Requirements ............................................................................................................................... 12
2.5.3 Mounting base dimension ........................................................................................................................ 12
2.6 Piping .................................................................................................................................................................. 14
2.6.1 General .................................................................................................................................................... 14
2.6.2 Charging refrigerant and adding refrigerant oil ........................................................................................ 17
2.7 Base/Side Panel Cutout Locations ...................................................................................................................... 17
2.8 Removing Transport Fastener And Vibration Absorber ...................................................................................... 19
2.9 Component Adjustment ...................................................................................................................................... 22
2.10 Installation Inspection ....................................................................................................................................... 22
Chapter 3 Electrical Installation ......................................................................................................................................... 23
3.1 Work Introduction And Notes .............................................................................................................................. 23
3.2 Wiring Of Indoor Unit .......................................................................................................................................... 23
3.2.1 Locating Electrical Interface Of Indoor Unit ............................................................................................. 23
3.2.2 Connecting Power Cable Of Indoor Unit .................................................................................................. 23
3.2.3 Connecting Control Cables ...................................................................................................................... 24
3.2.4 Connecting Extension Component Solenoid Valve (For Site Installation)................................................ 25
3.3 Wiring Of Outdoor Unit ........................................................................................................................................ 26
3.3.1 Connecting Power Cables For Outdoor Unit ............................................................................................ 26
3.3.2 Connecting Control Signal Cables Of Outdoor Unit ................................................................................. 26
3.3.3 Installation Inspection .............................................................................................................................. 27
3.3.4 HMI .......................................................................................................................................................... 28
3.3.5 Operation Description Of HMI .................................................................................................................. 29
Chapter 4 System Start-Up And Commissioning .............................................................................................................. 32
4.1 Location Of MCBs ............................................................................................................................................... 32
4.2 Power-on Commissioning ................................................................................................................................... 32
4.2.1 Preparation Before Commissioning ......................................................................................................... 32
4.2.2 Commissioning Procedures ..................................................................................................................... 33
4.2.3 Commissioning Complete Inspection....................................................................................................... 34
Chapter 5 Precision Air Conditioner Controller .................................................................................................................. 35
5.1 Appearance ........................................................................................................................................................ 35
5.2 Control Button ..................................................................................................................................................... 35
5.2.1 Function Description ................................................................................................................................ 35
5.2.2 Operation Example .................................................................................................................................. 35
5.3 Indicator ................................................................................................ .............................................................. 36
5.4 Control Interface ................................................................................................................................................. 36
5.4.1 OFF Interface .......................................................................................................................................... 36
5.4.2 MAIN Interface ......................................................................................................................................... 37
5.4.3 Password Interface .................................................................................................................................. 38
5.5 Menu Structure ................................................................................................................................................... 38
5.5.1 Guide On Finding Menus ......................................................................................................................... 38
5.5.2 Main Menu ............................................................................................................................................... 38
5.5.3 Alarm Menu ............................................................................................................................................. 39
5.5.4 Set Point Control ..................................................................................................................................... 41
5.5.5 System Status ......................................................................................................................................... 42
5.5.6 System Menu ........................................................................................................................................... 43
5.5.7 Set Time/Date .......................................................................................................................................... 46
5.5.8 Graph Menu ............................................................................................................................................. 47
5.5.9 Run Hours ............................................................................................................................................... 47
5.5.10 On/Off Record ....................................................................................................................................... 48
5.5.11 Team Work ............................................................................................................................................ 48
5.6 Help Menu .......................................................................................................................................................... 49
Chapter 6 System O&M .................................................................................................................................................... 50
6.1 Operation and maintenance of indoor unit ................................................................................................ .......... 50
6.1.1 Self-diagnosing Functions ....................................................................................................................... 50
6.1.2 Electric Control Part ................................................................................................................................. 50
6.1.3 Dust Filter ................................................................................................................................................ 51
6.1.4 Fan Kit ..................................................................................................................................................... 52
Liebert_DM 16kW Air Conditioner User Manual
6.1.5 Infrared Humidifier ................................................................................................................................... 52
6.1.6 Electric Reheat ........................................................................................................................................ 54
6.1.7 Cooling System ....................................................................................................................................... 54
6.1.8 Replacing The Compressor ..................................................................................................................... 56
6.2 Operation and maintenance of outdoor unit ........................................................................................................ 57
6.2.1 Maintenance ............................................................................................................................................ 57
6.2.2 Troubleshooting ....................................................................................................................................... 58
Chapter 7 Troubleshooting ................................................................................................................................................ 59
Appendix 1 SiteMonitor Software Introduction .................................................................................................................. 63
Appendix 2 Circuit Diagram of DME16 .............................................................................................................................. 64
Appendix 3 Circuit diagram of DMC16M2 ......................................................................................................................... 65
Appendix 4 Menu Structure ............................................................................................................................................... 66
Appendix 5 Alarm Control Menu Table.............................................................................................................................. 67
Appendix 6 Parameter Setting Table ................................................................................................................................ 68
Chapter 1 Overview 1
Liebert_DM 16kW Air Conditioner User Manual
Chapter 1 Overview
This chapter introduces the features, main parts, requirements on transportation and storage environment of the
Liebert_DM 16kW (DME16) air conditioner.
1.1 Model Description
The model description of Liebert_DM 16kW air conditioner is shown in Figure 1-1.
Figure 1-1 Model description
1.2 Product Introduction
Liebert_DM 16kW air conditioner is a medium-large sized precision environment control system, suitable to the
environment control of the equipment room or computer room. It aims to provide a sound operation environment for
precision equipment, such as sensitive equipment, industry processing equipment, communication equipment and
computers.
Liebert_DM 16kW air conditioner features high reliability, high sensible heat ratio and large airflow. It is configured with
an infrared humidifier adjustable to different water qualities, and is compatible with R407C refrigerant to meet the
requirement.
Liebert_DM 16kW air conditioner comprises indoor unit and outdoor unit. With the standard condenser unit, the
Liebert_DM 16kW air conditioner can reduce noise pollution to the minimum while meeting system cooling
requirement.
1.3 Main Components
1.3.1 Indoor Unit
The indoor unit of the Liebert_DM 16kW air conditioner includes compressor, evaporator, electric reheat, fan, controller,
infrared humidifier, thermal expansion valve, sight glass and drier-filter.
Compressor
The Copeland scroll compressor features low vibration, low noise and high reliability. The connection mode of
Rotalock makes the maintenance easier.
Evaporator
Finned tube evaporator with high heat dissipation efficiency is used. The distributor, with its model-specific design,
ensures that the refrigerant is distributed evenly in each loop, improving the evaporator efficiency to a great extent.
Thermal expansion valve
The external equalizer type thermal expansion valve collects temperature and pressure signals at the same time, so
that it can regulate the refrigerant flow more accurately.
DM E
16
U M H
2
Version
Power supply
: M -
three phase
/
50
Hz / 400 V E - indoor unit
; C -
outdoor unit
Liebert_DM
Cooling capacity class
:
16 - 16
kW
Air path
: U -
upflow
; F -
downflow
; D -
duct
C - cooling only
; O -
with heater
; H -
with heater and humidifier
2 Chapter 1 Overview
DM Series 16kW Air Conditioner User Manual
Infrared humidifier
The infrared humidifier is designed with a simple structure, which is easy for teardown, cleaning and maintenance. It is
adjustable to a wide range of water qualities, with fast startup and high humidifying efficiency.
Fan
The system uses centrifugal fan with high efficiency and reliability, large airflow and long blowing distance. With the
belt transmission mechanism, it is easy for maintenance.
Electric reheat
The indoor unit adopts the PTC electric heater with a quick heating rate and even heat quantity.
Sight glass
The sight glass is the window for observing the system refrigerant recycle, mainly the moisture content of system.
When the moisture content is too high, the color will change from green to yellow.
Filter drier
The filter drier can effectively eliminate the moisture in system within a period of time, filtrate the impurities generated
during long-term system operation and ensure normal system operation.
1.3.2 Outdoor Unit
The outdoor unit DMC16M2 condenser is applicable to Liebert_DM 16kW air-cooled series.
The DMC16M2 condenser is the newly standard configuration outdoor unit of the Liebert_DM 16kW AC. It adopts
corrugated finned tube heat exchanger which features high heat dissipation efficiency, convenient cleaning and
maintenance. External rotor axial fan with unique ‘sickle’ shape metal fan leaf has the superior aerodynamic property.
The six and eight pole fan, with specially designed draught ring, makes the air flow noise through the fan leaf
significant reduction. The high performance three-phase motor that is customized for the base station power grid
environment can be applicable to the wide voltage range and has the higher reliability. The advanced fan speed
control system regulates the voltage output by detecting the condensing pressure of the system to control the outdoor
fan speed and make the system pressure and heat load adaptable. It makes sure that the AC unit can operate stably,
reliably and efficiently.
1.3.3 Controlling System
1.3.4 Controller
The micro-processing controller of Liebert_DM 16kW air conditioner uses the LCD screen with blue backlight and 240
× 128 pixels. The user interface operation is simple. The multi-level password protection can effectively prevent illegal
operation. The controller also features power failure auto-restoration and high / low voltage protection function. The
operation time of components is available through the menus. The expert-level fault diagnosis system can display the
current fault information automatically, facilitating the maintenance. The controller can store 200 records of historical
events. The panel of micro-processing controller is shown in Figure 1-2.
LCD screen
UP button
ENTER button
DOWN button
ON/OFF button
ESC button
Running indicator
Alarm indicator
Figure 1-2 The panel of micro-processing controller
Chapter 1 Overview 3
Liebert_DM 16kW Air Conditioner User Manual
1.4 Environment Requirements
1.4.1 Operation Environment
See Table 1-1 for the details.
Table 1-1 Operation enviroment requirement
Item
Requirement
Environment temperature
Indoor: 0℃～40℃
Outdoor:
－15℃～＋45℃
Protection level (outdoor unit)
IP55
Altitude
<1000m. Above that, derating is required
Operation voltage range
380V (-10% ~ +15%), 3N ~ 50Hz
1.4.2 Storage Environment
Table 1-2 Storage enviroment requirement
Item
Requirement
Storage environment
Indoor, no dust
Environment humidity
5%RH ~ 85%RH (non-condensing)
Environment
temperature
－40℃～＋70℃
Storage time
Total transportation and storage time should not exceed 6 months. Otherwise, the performance needs
to be re-evaluated
4 Chapter 2 Mechanical Installation
DM Series 16kW Air Conditioner User Manual
Chapter 2 Mechanical Installation
This chapter introduces the mechanical installation of the Liebert_DM 16kW air conditioner, which includes
transportation, installation arrangement and installation procedures.
2.1 Transportation, Unpacking And Inspection
2.1.1 Transportation And Movement
Railroad transportation and shipping are the recommended means of transportation. If truck transportation is
unavoidable, choose roads that are less bumpy in order to protect the equipment.
The Liebert_DM 16kW air conditioner is heavy (see Table 2-1 for the weight parameters). It is recommended to use
mechanical handbarrow such as electric forklift when unpacking and moving the equipment to the place most close to
the installation site. Insert the tines of the forklift below the pallet, as shown in Figure 2-1. Align the tines to the center
of gravity to prevent the unit from falling over.
Figure 2-1 Forklift removal
When moving the indoor unit, keep the obliquity within 75° ~ 105°, as shown in Figure 2-2.
105
75
Figure 2-2 The obliquity of indoor unit
2.1.2 Unpacking
Move the product to the place most close to the final installation site before unpacking the unit.
Follow the procedures below to unpack the unit:
1. Removing the side boards and top cover
Liebert_DM 16kW air conditioner uses the international packaging. You can use a hammer or straight screwdriver to
straighten the hook, as shown in Figure 2-3.
Figure 2-3 Straighten the hook
Chapter 2 Mechanical Installation 5
Liebert_DM 16kW Air Conditioner User Manual
At first, straighten all the hooks that fix side board I, and remove side board 1. Then straighten all the hooks that fix
side board 2, and remove side board 2. At last remove top cover 3, as shown in Figure 2-4.
Kg
1790 x 950 x 2020mm
1816 x 976 x 2175mm
1
2
1
2
3
Figure 2-4 Remove side boards and top cover
2. Removing the pallet
Liebert_DM 16kW air conditioner is fixed onto the pallet with M10 × 70 screws, as shown in Figure 2-5. You can use
M10 open-end spanner, ratchet spanner or sleeve to remove the screws.
Fixed screw on base pallet (M10 70)
Figure 2-5 Screws on pallet
2.1.3 Inspection
After receiving the product, you should check against the packing list. If any parts are found missing, distorted or
damaged, please report to the carrier immediately. If any covert defects are found, please report to the carrier and the
distributor.
2.2 Installation Notes
To realize the designed performance and maximum product life, the installation must be correct. This section should
be used in conjunction with local industry standards for mechanical and electrical installations.
Liebert_DM 16kW air conditioner is designed for split floor installation. The indoor unit must be installed on the floor of
the equipment room or computer room, and the outdoor unit can be installed outdoors or on the floor of other rooms.
Before installation, make sure that the installation environment meets the requirements (see 1.4 Environment
Requirements) and the building should be transformed to accommodate the construction work of piping, wiring and
ventilation ducts.
6 Chapter 2 Mechanical Installation
DM Series 16kW Air Conditioner User Manual
Follow the design drawings strictly when installing the equipment, and reserve the space for maintenance. The
manufacturer’s engineering dimensions drawings can serve as a reference.
2.3 System Installation Arrangement
2.3.1 General Arrangement
The general arrangement of Liebert_DM 16kW air conditioner is shown in Figure 2-6.
Scroll compressor
Service valve
Suction line
Discharge line
Ball
valves
Sensing bulb
Evaporator coil
Dehum solenoid valve
Thermal expansion valve
Sight glass
Filter drier
Solenoid valve
High pressure switch
Charging port
Low pressure switch
Condenser coil
Check valve
Distributor
Traps(every 7.5m
of vertical lift)
#1 circuit only
Figure 2-6 General arrangement diagram of air-cooled series
Note
1. : Factory piping.
2. : Field piping (by others).
3. *: Components are not supplied by Emerson but are recommended for proper circuit operation and maintenance.
4. +: Components are required when the equivalent length exceeds 30m.
2.3.2 System Installation Sketch Map
The installation mode of air-cooled series unit is shown in Figure 2-7 and Figure 2-8.
Note
1. If the condenser is installed higher than the compressor, an external back bend should be fitted to the suction line and liquid
return line of the condenser, so as to prevent the liquid refrigerant from flowing back when the condenser stops.
2. The top end of the back bend must be installed higher than the highest copper pipe of the condenser.
Chapter 2 Mechanical Installation 7
Liebert_DM 16kW Air Conditioner User Manual
Slope dicharge
Back bend (higher than the highest copper pipe of condenser
)
Liquid line
( do not expose liquid line to sun )
Trap
Heat insulation floor
Seal
Outdoor unit
Indoor unit
Floor
Condenser
Humidifier
The earth surface
Max.7
.
5
m
Max
.20m
water in
water out
Supporting bar
Figure 2-7 Condenser installed higher than compressor
Supporting bar
Slope dicharge
Heat insulation floor
Seal
Outdoor unit
Floor
Condenser water out
Humidifier water in
The earth surface
Max.5m
Slope liquid
Indoor unit
Figure 2-8 Compressor installed higher than condenser
2.3.3 Mechanical Paremeters
Indoor unit
The mechanical parameters of the indoor unit are shown in Figure 2-9.
8 Chapter 2 Mechanical Installation
DM Series 16kW Air Conditioner User Manual
874
256
54
1970
853
50
400
874
1970
853
50
Figure 2-9 Mechanical parameters of the indoor unit
Plenum
You can select the air supply plenum with grids for the upflow system. The appearance of the plenum is shown in
Figure 2-10. The dimensions are listed in Table 2-1.
C
B
A
Figure 2-10 Appearance of the plenum
Table 2-1 Dimensions of plenum
A B C
867 853
400 (600,optional)
Note
If the height of the plenum selected for air conditioner unit exceeds 600mm, consult the factory for non-standard production..
Outdoor unit
The appearance of outdoor unit is shown in Figure 2-11.
The dimensions and mechanical parameters of outdoor unit are shown in Figure 2-12.
Chapter 2 Mechanical Installation 9
Liebert_DM 16kW Air Conditioner User Manual
风机
电控盒（内有风
机转速控制器）
压力传感器
Fan
Electrical control box(there is a fan speed
controller inside)
Pressure sensor
Figure 2-11 Appearance of outdoor unit
1385
992
664
Figure 2-12 Dimensions and mechanical parameters of outdoor unit
2.4 Installing Indoor Unit
2.4.1 Preparing Equipment room
The requirements of equipment room are as follows:
1. Damp proof and heat preservation must be done to make sure that the system can operate normally.
2. The equipment room should have good heat insulation and sealed damp proof layer. The damp proof layer of the
ceiling and walls must use polyethylene film, and the coating of the concrete wall and the floor must be damp proof.
3. Prevent the outdoor air from entering the equipment room, because the outdoor air that enters the equipment room
may increase the load of heating, cooling, humidifying and dehumidification of the system. It is recommended that the
inhalation of outdoor air be kept below 5% of the total indoor airflow.
4. All the doors and windows should be closed and the seams should be as narrow as possible.
2.4.2 Installation Space
Note
Liebert_DM 16kW air conditioner system will generate condensed water, and water leakage may damage the precision
equipment nearby. So do not install the system in the vicinity of any precision equipment, and the installation site must provide
draining pipes.
1. To ensure normal operation, the installation space for the indoor unit shall be capacious enough.
2. Too small space for the indoor unit will baffle the airflow, shorten the cooling cycle; the air supply and air exhaust
may mix, and the decibel may rise.
3. Do not place the indoor unit in a concave or at the end of a strip area.
4. Do not huddle multiple indoor units, lest there should be mixed airflow, unbalanced load and competitive operation.
10 Chapter 2 Mechanical Installation
DM Series 16kW Air Conditioner User Manual
5. For the convenience of daily maintenance, do not install other equipment (such as smoke detector) above the
cabinet.
Figure 2-13 shows the installation place of the indoor unit.
Good place
Unit
Unit
Note:
The reserved maintenance space while installing
600600 600
Bad place
Figure 2-13 Installation place of indoor unit (unit: mm)
2.4.3 Requirement Of Maintenance Space
Leave more than 600mm of maintenance space in the front and two sides of the indoor unit, as shown in Figure 2-13.
Chapter 2 Mechanical Installation 11
Liebert_DM 16kW Air Conditioner User Manual
2.4.4 Installation Procedures
The installation procedures of indoor unit are as follows:
1. Make the mounting base according to the dimensions in Figure 2-14 and the requirements in Table 2-2. You can
make it by yourself or contact Emerson Network Power Co., Ltd. for non-standard production.
161.5
530
161.5
67
680.5
820
760
853
H
46.5
Steel plate
Angle steel
Installation hole
for expansion bolt
4-Ф 14
cabinet installation hole
Rubber cushion(top)
Front side of cabinet
Rubber cushion (bottom)
Rear side of
cabinet
Rubber cushion (lateral)
46.5
Figure 2-14 Mounting base of one bay series
Table 2-2 Specifications of indoor unit mounting base
Item
Specification
Remark
Steel plate
100mm × 100mm × (5 ~ 6.5)mm
-
Angle steel
40mm × 40mm × 3mm
-
Rubber
cushion
Top
Thickness: 3mm ~ 5mm
-
Lateral
Thickness: 2mm ~ 3mm
-
Botton
Thickness: 10mm ~ 12mm
-
Installation hole for
expansion hole
-
Install the holes according to your requirements
H
One bay
H = 200mm (upflow unit)
H = 300mm (downflow unit, according to the floor
height)
1. The upflow unit do not need the flow deflector
2. The H dimension is only a reference. It should
be determined accroding to your actual
requirements during making the mounting base
Two bay
Three bay
Note:
The external side boards of the unit cannot bear weight. Take this into consideration while selecting angle steel and fixing holes
As the value of H exceeds 450mm, please strengthen the mounting base or contact Emerson Network Power Co., Ltd.
2. Lay a layer of rubber cushion on the top, lateral of mounting base and on the bottom of the steel plate respectively.
See Figure 2-18, Figure 2-19 and Figure 2-20 for their positions and see Table 2-3 for the thickness.
3. Identify the installation position. Fix the mounting base onto the mounting base according to the site conditions and
your requirement.
4. Fix the AC unit onto the mounting base with nuts, spring washers, flat washers and bolts.
2.5 Installing Outdoor Unit
2.5.1 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 air flow. Do not install it where
the coil of the condenser may be obstructed by dust and 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 as far away as possible from residential areas (≥15m).
12 Chapter 2 Mechanical Installation
DM Series 16kW Air Conditioner User Manual
4. Be careful not to damage the waterproof layer and observe the local rules and regulations when the condenser is
installed on the roof of building.
5. Position the condenser higher than the indoor unit to ensure normal oil return.
6. Follow the installation arrows on the condenser for the installation direction.
2.5.2 Space Requirements
Note
1. A 4000mm clearance is required around the condenser air outlet.
2. The 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 detailed space
requirements are shown in Figure 2-15 and Figure 2-16.
600
1200
450
Air flowAir flow
Figure 2-15 Horizontal installation space requirement (unit: mm)
600
4000
Air flow
Figure 2-16 Vertical installation space requirement (unit: mm)
2.5.3 Mounting base dimension
Mounting base for horizontal installation
The mounting base for horizontal installation is shown in Figure 2-17 and the mounting base dimensions of each
model are listed in Table 2-3.
Chapter 2 Mechanical Installation 13
Liebert_DM 16kW Air Conditioner User Manual
D
D
L'
D
H'
D
Amplified part figure
D
D
Installation holes
(8 holes in total )
Bottom view
455
455
148 B
148
C
Front view Side view
Figure 2-17 Mounting base dimensions for horizontal installation (unit: mm)
Table 2-3 Mounting base dimensions for horizontal installation (unit: mm)
Model
Dimension
(L' × H' × D)
B
C
DMC16M2
1126 × 837 × 53
980
691
Note
The installation holes are long and flat holes. It is recommended to use M10 × 20 bolts to fix the mounting base.
Mounting base for vertical installation
The mounting base for vertical installation is shown in Figure 2-18, and the dimensions of each model are listed in
Table 2-4.
250
102
452
490
a
2020
Installation
hole (4 pcs)
Amplified
part figure
Figure 2-18 Mounting base dimensions for vertical installation (top view) (unit: mm)
Table 2-4 Mounting base dimensions for vertical installation (unit: mm)
Model
Dimension ‘a’
DMC16M2
1280
Note
1. The installation holes are long and flat holes. It is recommended to use M10 × 20 bolts to fix the mounting base.
2. When one condenser needs to be installed on another one, the upper condenser must be installed on a rack and cushion pads
should be used between the condenser and the rack for damping. It is prohibited to stack two condensers and bolt them together
directly.
14 Chapter 2 Mechanical Installation
DM Series 16kW Air Conditioner User Manual
2.6 Piping
All joints of the cooling pipes must be silver brazed. Standard industry procedures must be followed in selecting, laying,
and fixing the pipes, and in vacuuming the system and charging refrigerant. Take pipeline pressure drop, oil return to
the compressor and minimization of noise and vibration into consideration during the design and construction.
2.6.1 General
The recommended pipe sizes are ‘equivalent lengths’ (see Table 2-5 for equivalent lengths of partial components),
which has included the resistance brought about by bends. You should confirm that the sizes are appropriate for the
site conditions.
1. If the one-way equivalent length exceeds 30m, or if the vertical difference between indoor unit and outdoor unit
exceeds the values in Table 2-5, consult the factory before installation for confirmation whether extended components
are needed.
Table 2-5 Vertical difference between indoor unit and outdoor unit
Relative position
Value
Indoor unti lower than outdoor unit
Max.: +20m
Outdoor unit lower than indoor unit
Max.: -5m
2. The pipe sizes recommended in Table 2-6 are ‘equivalent lengths’, which has included the resistance brought about
by bends and valves. You should confirm that the sizes are appropriate for the site conditions.
Table 2-6 Equivalent lengths of partial components
Outer Diameter (OD) of
liquid pipe (inch)
Equivalent length (m)
90°bend
45°bend
T type three way
3/8
0.21
0.10
0.76
1/2
0.24
0.12
0.76
5/8
0.27
0.15
0.76
3/4
0.3
0.18
0.76
7/8
0.44
0.24
1.1
1-1/8
0.56
0.3
1.4
Note
A trap is required for every 7.5m of vertical lift. Please consult the factory for detailed information.
Connecting pipes
The pipes to connect include:
1. Cooling water drain-pipe of indoor unit
2. Water supply pipe of infrared humidifier
3. Connecting copper pipe (exhaust pipe and liquid return pipe) between indoor unit and outdoor unit
4. Installing extension subassembly (optional)
Connecting cooling water drain-pipe of indoor unit
The cooling water of infrared humidifier and evaporator is converged by the cross connector and drains through the
draining pipe, as shown in Figure 2-19. The OD of the pipe is 25mm. If the draining pipe is used by three or more units,
the minimal OD of the pipe should be 40mm.
Note
Because the humidifier contains boiling water, the plastic pipe must be rated higher than 90℃.
Chapter 2 Mechanical Installation 15
Liebert_DM 16kW Air Conditioner User Manual
Water supply pipe of
infrared humidifier
Connector of condensation
water drain pipe
To condensation water
pan of evaporator
To infrared humidifier
water pan
Cross connector
Hose clamp
To condensation water
pan of evaporator
To the condensation
water drain pipe
Figure 2-19 Connection of drain pipe
Note
1. A Φ25 hose clamp is delivered as an accessory to connect the draining pipe.
2. When connecting the draining pipe, make sure that the U bend is installed vertically and the ‘U’ shape is not distorted, so as to
ensure that the cooling water can be drained immediately and effectively.
Connecting water supply pipe of infrared humidifier
The water pipes should be connected for the infrared humidifier. To facilitate maintenance, a strainer / non-return
isolation valve is fitted to the supply water pipe. The infrared humidifier water supply pipe reserves a copper pipe (OD:
6.35mm, see Figure 2-20) with a 1/4” copper nut at the end of the pipe. Take out of the 1/4” × 1/2” screw-thread copper
connector from the accessory bag and screw the connector onto the copper pipe. You can also select other connection
modes according to the site condition. Make sure the connection is well sealed to prevent leakage. The pipe pressure
is 100kPa ~ 700kPa.
Where the main pressure may rise above 700kPa, a pressure reducer should be fitted. Where the pressure falls below
100kPa, a water tank and pump system should be used.
Note
Main water supply connections must be made in accordance with local laws and regulations.
Water supply solenoid valve
Water level sensor
Water supply pipe
Ceramic terminal socket
Over-temperature
protection relay
Water pan (removable)
OD6.35mm
Over-temperature protection
switch (under the pan)
Water pan fixing screw
Water level regulator
Stainless steel bolt
Over-temperature
protection switch
Water outlet
A direction
Wiring cover plate
A direction
Water supply pipe
Figure 2-20 Infrared humidifier
16 Chapter 2 Mechanical Installation
DM Series 16kW Air Conditioner User Manual
Connecting copper pipe (exhaust pipe and liquid return pipe) between indoor unit and outdoor unit
The indoor unit and outdoor unit are connected through welded copper pipes. The connection of discharge pipe / liquid
pipe of indoor unit is shown in Figure 2-21. Note that the ball valve must be wrapped with a wet cloth before welding. In
addition, many notes and instruction labels are pasted onto the base board and side board close to the ball valve. Do
not have them burned during the welding operation.
Note
The exposure time of system pipes do not exceed 15min. Otherwise, it will lead to the POE refrigeration oil moisture effect the
life of the key components and the system operation stability.
Horizontal sections of discharge pipes should be sloped downward from the compressor, with a slope of at least 1:200
(5mm down for each 1m run). Discharge pipes should be heat insulated where they are routed in the conditioned
space (including under a raised floor).
The liquid pressure drop should not exceed 40kPa (5psi ~6psi), provided that there is no loss of refrigeration. The
liquid line pressure drop is the sum of liquid flow resistance from the tubing and fitting (including the drier), plus the
loss of head pressure due to elevation above the condenser. If the liquid temperature is 38℃, the static pressure loss
is 11kPa (1.6 psi) per meter of lift.
Ball valve(liquid line)
Ball valve(discherge line)
Figure 2-21 Connection of discharge pipe / liquid return pipe
Considering the effect of the pipe OD to the system pressure drop, the pipe OD of indoor unit and outdoor unit should
be determined according to the specifications listed Table 2-7.
Table 2-7 Recommended pipe sizes
Eq.Lgth D L
10m
22
13
20m
22
13
30m
22
13
40m*
22
13
50m*
22
13
60m*
22
16
Note
1. Extension subassembly should be added to the “Eq.Lgth” marked with *.
2. D: discharge line, L: liquid line.
3. Consult factory if the line length exceeds 60m.
Installing the extension subassembly (be applicable to site installation)
When the equivalent length of pipe exceeds 30m, the extension subassembly should be installed. It is recommended
to install the solenoid valve of the extension subassembly to the outside project pipe of the ball valve on the liquid pipe,
or the outer side (or on the bottom) of the unit.
So, during installing the solenoid valve, you need not to cut the indoor unit pipes. After the whole system is installed,
you can open the ball valve to keep pressure and carry out vacuum operation, avoiding the moisture absorption of the
compressor refrigeration oil and ensuring the operation safety and life of the compressor. For installation valve of the
check valve, refer to Figure 2-6.
Chapter 2 Mechanical Installation 17
Liebert_DM 16kW Air Conditioner User Manual
2.6.2 Charging refrigerant and adding refrigerant oil
1. Charging with refrigerant
The Liebert_DM 16kW air conditioner had been charged with 2bar nitrogen to keep pressure at the factory. In project
installation, see the unit nameplate for the initial charging capacity of Liebert_DM 16kW air conditioner.
If the connecting pipe between the indoor unit and the outdoor unit is longer than 10m, add refrigerant to the system in
order to ensure normal system operation.
The amount of the refrigerant is calculated through the following formula:
Refrigerant amount (kg) = unit length liquid pipe refrigerant amount (kg/m) × length of extended pipe (m)
See Table 2-8 for the unit length liquid pipe refrigerant amount.
Length of extended pipe (m) = Total length of liquid pipe (m) - 10m
Table 2-8 Unit length liquid pipe refrigerant amount of pipes with different ODs
Pipe OD (mm)
Unit length liquid pipe refrigerant
amount (kg/m)
Pipe OD (mm)
Unit length liquid pipe refrigerant
amount (kg/m)
9.52
0.060
19
0.261
12.7
0.112
22
0.362
16
0.181
28.6
0.618
2. Adding POE refrigerant oil
The added refrigerant will dilute the POE refrigerant oil in the system, undermining the lubricating and cooling effects
of the POE refrigerant oil. Therefore more POE refrigerant oil should be added. See the formula below:
Amount of refrigerant oil to be added (ml) = amount of added refrigerant (kg) × 22.6
2.7 Base/Side Panel Cutout Locations
Base cutout locations
Figure 2-22 and Figure 2-23 show the base figures with the side panel removed, and the distance between the dashed
lines and the rear panels is 25 mm, where is the mounting place of inner side panel.
530
160
72.5
80
200
45
760
7245109
798
680.5
161
140
D
IRWI
F
F
F
F
P
WO
/LL
WI
/DL
K K
4-Φ 13
25
25
50
Knock-out
Knock-out
2-Φ 35
Knock-out
2-Φ 64
Knock-out
2-Φ 40
IRWI: Infrared humidifier water in
D: Drain
P: Power cable entry (Φ30)
F: Unit set screw
K: Knock-out
LL/DL: Liquid line / discharge line (air-cooled models)
WI/WO: Condenser water inlet and outlet (water-cooled
models)
Figure 2-22 Base cutout location of upflow models
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