Vertiv Liebert CRV+ Series Air Conditioner User manual

Liebert CRV+ Series Air Conditioner

User Manual

Version V1.0

Revision date November 11, 2013

BOM 31012977

Emerson Network Power provides customers with technical support. Users may contact

the nearest Emerson local sales office or service center.

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: [email protected]

Contents

Chapter 1 Overview ............................................................................................................................................................ 1

1.1 Model Description ................................................................................................................................................. 1

1.2 Refrigerant Requirement ....................................................................................................................................... 1

1.3 Product Introduction .............................................................................................................................................. 2

1.4 Product Appearance ............................................................................................................................................. 2

1.5 Main Components Of Indoor Unit.......................................................................................................................... 3

1.6 Environmental Requirements ................................................................................................................................ 4

1.6.1 Operation Environment .............................................................................................................................. 4

1.6.2 Storage Environment ................................................................................................................................. 4

Chapter 2 Mechanical Installation ....................................................................................................................................... 5

2.1 Movement, Unpacking And Inspection .................................................................................................................. 5

2.1.1 Transportation And Movement .................................................................................................................. 5

2.1.2 Unpacking .................................................................................................................................................. 5

2.1.3 Inspection .................................................................................................................................................. 6

2.2 Installation Notes .................................................................................................................................................. 6

2.3 System Installation Arrangement .......................................................................................................................... 7

2.3.1 Overall System Arrangement ..................................................................................................................... 7

2.3.2 System Installation Illustration ................................................................................................................... 7

2.3.3 Mechanical Parameters ............................................................................................................................. 8

2.4 Installing Indoor Unit ........................................................................................................................................... 11

2.4.1 Equipment Room Requirement ............................................................................................................... 11

2.4.2 Installation Space .................................................................................................................................... 11

2.4.3 Installation Procedures ............................................................................................................................ 12

2.5 Piping .................................................................................................................................................................. 14

2.5.1 Connecting Air-Cooled Unit Pipe ............................................................................................................. 14

2.5.2 Charging Refrigerant And Adding Refrigerant Oil .................................................................................... 17

2.6 Removing Transportation Fastener And Vibration Absorber ............................................................................... 18

2.7 Installation Inspection ......................................................................................................................................... 19

Chapter 3 Electrical Installation ......................................................................................................................................... 20

3.1 Task Introduction ................................................................................................................................................ 20

3.2 Connecting Cables Of Indoor Unit ...................................................................................................................... 20

3.2.1 Electrical Port Location Of Indoor Unit ..................................................................................................... 20

3.2.2 Connecting Power Cable Of Indoor Unit .................................................................................................. 21

3.2.3 Connecting Control Cable........................................................................................................................ 22

3.2.4 Connecting Solenoid Valve Of Pipe Extension Kit (Option For Site Installation) ..................................... 23

3.3 Installation Inspection ......................................................................................................................................... 24

Chapter 4 System Power-On Commissioning ................................................................................................................... 25

4.1 Location Of MCBs ............................................................................................................................................... 25

4.2 Power-On Commissioning Of Air-Cooled Series Unit ......................................................................................... 25

4.2.1 Preparation Before Commissioning ......................................................................................................... 25

4.2.2 Commissioning Procedures ..................................................................................................................... 26

4.2.3 Inspection After Commissioning .............................................................................................................. 27

Chapter 5 Micro-Processing Controller ............................................................................................................................. 28

5.1 Feature ............................................................................................................................................................... 28

5.2 Appearance ........................................................................................................................................................ 28

5.3 LCD Screen ........................................................................................................................................................ 28

5.4 Control Button ..................................................................................................................................................... 29

5.4.1 Function Descriptions .............................................................................................................................. 29

5.4.2 Operation Example .................................................................................................................................. 29

5.5 Control Screen .................................................................................................................................................... 30

5.5.1 ON Screen ............................................................................................................................................... 30

5.5.2 Normal Screen ......................................................................................................................................... 30

5.5.3 Password Screen .................................................................................................................................... 31

5.6 Menu Structure ................................................................................................................................................... 31

5.6.1 Main Menu ............................................................................................................................................... 31

5.6.2 Alarm Menu ............................................................................................................................................. 32

5.6.3 Temp&Hum Set ....................................................................................................................................... 35

5.6.4 System State ........................................................................................................................................... 36

5.6.5 System Set .............................................................................................................................................. 38

5.6.6 Help Menu ............................................................................................................................................... 40

5.6.7 Display Set .............................................................................................................................................. 41

Chapter 6 System Operation And Maintenance ................................................................................................................ 42

6.1 System Self-Diagnosing Test .............................................................................................................................. 42

6.1.1 Self-Diagnosing Functions ....................................................................................................................... 42

6.1.2 Electric Control Part ................................................................................................................................. 42

6.2 Dust Filter ........................................................................................................................................................... 43

6.3 Fan Kit ................................................................................................................................................................ 43

6.4 Electrode Humidifier ............................................................................................................................................ 44

6.5 Electrical Heater .................................................................................................................................................. 46

6.6 Drain System ...................................................................................................................................................... 46

6.7 Refrigerating System .......................................................................................................................................... 46

6.7.1 Suction Pressure ..................................................................................................................................... 46

6.7.2 Discharge Pressure ................................................................................................................................. 46

6.7.3 Electronic Expansion Valve ..................................................................................................................... 47

6.7.4 Air-Cooled Condensor ............................................................................................................................. 47

6.7.5 Compressor ............................................................................................................................................. 47

Chapter 7 Troubleshooting ................................................................................................................................................ 49

Appendix 1 Circuit Diagram ............................................................................................................................................... 53

Appendix 2 Menu Structure Of Micro-Processing Controller ............................................................................................. 55

Appendix 3 Alarm Control Menu Table.............................................................................................................................. 57

Appendix 4 Parameter Setting Table ................................................................................................................................ 58

Chapter 1 Overview 1

Liebert CRV+ Series Air Conditioner User Manual

Chapter 1 Overview

The Liebert CRV+ series precision air conditioner is a professional device, applicable to occasions inaccessible to

general public.

This chapter introduces the Liebert CRV+ series air conditioner on its model description, refrigerant requirement,

product introduction, appearance, main components of indoor unit and requirements on operation and storage

environment.

1.1 Model Description

The model description of the Liebert CRV+ series air conditioner is shown in Figure 1-1.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

C R 0 2 5 H A 1 3 8 0 S 0 2 E 1 0 0 0 0 P V 0 0 0

Series name

Description 15 Coil and valve

CR Liebert CRV+ E Standard

DX air-cooled coil, electronic expansion valve

Refrigeration capacity 16 Cabinet color

Nominal refrigeration capacity 1 Standard volor (Z-7021 black-grey)

6 Air supply mode 17 High voltage option

R Horizontal air supply with guide grill 0 None

H Horizontal air supply without guide grill 18 Low voltage locking option

7 System type 0 None

A Air cooling H Heating and humidification locking

8 Fan 19 Monitoring

1 EC fan 0 None

9 Power supply type S

SIC card

3 380V ~ 415V/3ph/50Hz+N 20

Detector

10 System configuration 0 None

8 R-410A DC brushless scroll compressor H Fire sensor

11 Humidifier S Smoke sensor

0 None F Fire sensor + smoke sens or

S Steam humidifier 21 Package

12 Display P Domestic

S Standard display panel C Overseas (seaworthy)

L Large display panel 22 Special function

13 Heating A None

0 None V With condensate drain pump

1 Electric heater 23 ~ 25 Special identifier for order

14 Filter

2 G4 (EU4)

0 G4 (EU4) + Filter pressure difference switch

1 ~ 2

3 ~ 5

0 2 5

Figure 1-1 Model description

1.2 Refrigerant Requirement

Low quality or counterfeit refrigerant will damage the system severely. Please use the refrigerant approved by

Emerson Network Power Co., Ltd. For the system abnormity or damage caused by using low quality refrigerant, the

warranty will be invalid.

The refrigerant brands approved by Emerson Network Power Co., Ltd include:

 DU PONT ( ):The DU PONT refrigerant adopts Emerson custom-made package.

 JUHUA ( )

Warning

Please do not use low quality refrigerant. For any result caused by using low quality refrigerant, the warranty will be invalid.

2 Chapter 1 Overview

Liebert CRV+ Series Air Conditioner User Manual

1.3 Product Introduction

The Liebert CRV+ series air conditioner is a medium and small size precise environment control system, applicable to

environment control in medium and small size equipment room, modularized machine room and machine room of

high heat density with need of saving energy. It can maintain a favorable running environment for precise devices

such as sensitive devices, industry process devices, communication devices and computers.

The Liebert CRV+ series air conditioner features high reliability, high sensible heat ratio and large airflow. An

electrode humidifier is configured and R410A environment-friendly refrigerant is used, to meet the requirements on

environment friendly refrigerant internationally.

The unit is an air-cooled single cooling system, that is, compressor refrigeration system. The system is configured

with DC speed regulation back-inclined centrifugal fan (EC fan for short).

The Liebert CRV+ series air conditioner consists of an indoor unit and an outdoor unit. The Liebert CRV+ condenser

is standard configuration, and it can reduce noise pollution to environment to greatest extent on the base of satisfying

system cooling requirement, and improve reliability of operation.

1.4 Product Appearance

The appearance of the Liebert CRV+ series air conditioner is shown in Figure 1-2.

CR025RA138 CR035RA138

Figure 1-2 Appearance of the air conditioner

Chapter 1 Overview 3

Liebert CRV+ Series Air Conditioner User Manual

1.5 Main Components Of Indoor Unit

The indoor unit of the Liebert CRV+ series air conditioner consists of DC brushless compressor, evaporator,

electronic expansion valve, electrode humidifier, EC fan, electric heater, sight glass, filter dryer, micro-processing

controller and so on.

Compressor

Adopt a DC brushless scroll compressor. It features low vibration, low noise and high reliability.

Evaporator

Adopt a fin-tube heat exchanger with high efficiency. The distributor is designed and verified according to individual

model to ensure that the refrigerant is distributed evenly in each loop, improving the efficiency of the heat exchanger

to a great extent.

Electronic expansion valve

Adopt an electronic expansion valve. It collects temperature and pressure signals at the same time to accurately

regulate the refrigerant flow.

Fan

Adopt an EC fan. It features high efficiency, energy saving, space saving and low noise.

Electric heater

Adopt a PTC heater. It features quick heating, even quantity of heat, operation safety and reliability.

Sight glass

The sight glass is the window of the system cycle, for observing the refrigerant state, mainly the moisture content of

the system. When the moisture content exceeds the standard, the color will be changed.

Filter drier

The filter drier can effectively eliminate the moisture in the system and filtrate the impurities generated during

long-term system operation so as to ensure the normal system operation.

Micro-processing controller

The Liebert CRV+ series air conditioner uses EMERSON micro-processing controller which adopts advanced PID

regulating technology. The micro-processing controller adopts the LCD screen with blue backlight (small board: white

backlight; large board: blue backlight) and 240 × 128 dots (small board: 128 × 44; large board: 240 × 128). The user

interface operation is simple. The multi-level password protection can effectively prevent illegal operation. It also

provides power failure auto-restoration function and high/low voltage protection function. The operation time of

components is available through the menus. The expert-level fault diagnosis system can automatically display the

current fault information, facilitating the maintenance. It can store up to 200 historical event records. An RS485 port is

configured, and Modbus protocol is used. The panel of the micro-processing controller is shown in Figure 1-3.

Run indicator Alarm indicator ESC button

Enter button

On/off buttonDisplay panel

Up button

Down button

Figure 1-3 Panel of micro-processing controller

4 Chapter 1 Overview

Liebert CRV+ Series Air Conditioner User Manual

Remote Monitoring Software

The Liebert CRV+ series air conditioner adopts Modbus protocol. Through the configured RS485 port or TCP/IP port,

the Liebert CRV+ system can communicate with the host computer and receive the control of the host software.

1.6 Environmental Requirements

1.6.1 Operation Environment

See Table 1-1 for details.

Table 1-1 Operation environment requirement

Item Requirement

Ambient temperature Indoor 18°C ~ 40°C

Outdoor -34°C ~ +45°C

Protection level (indoor unit) IP20

Altitude < 1000m. Above that, please contact Emerson Network Power Co., Ltd.

Operation voltage range (380 ~ 415)V ± 10%), 3N ~ 50Hz

1.6.2 Storage Environment

See Table 1-2 for details.

Table 1-2 Storage environment requirement

Item Requirement

Storage environment No protection against weather

Ambient humidity < 95%RH

Ambient temperature -33°C ~ +70°C

Storage time Total transportation and storage time should not exceed six months. Otherwise, the performance

needs to be re-calibrated

Chapter 2 Mechanical Installation 5

Liebert CRV+ Series Air Conditioner User Manual

Chapter 2 Mechanical Installation

This chapter introduces the mechanical installation of the Liebert CRV+ series air conditioner, including transportation,

movement, unpacking, inspection, installation notes, system installation arrangement, installing indoor unit, installing

unit pipes, removing transportation fastener and vibration-absorber, and installation inspection.

2.1 Movement, 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 to protect the equipment.

The Liebert CRV+ series air conditioner is heavy (see Table 2-1 for the weight). It is recommended to use mechanical

handbarrow such as an electric forklift to unload and move the equipment to the place closest to the installation site.

If a forklift is used, insert the tines of the forklift below the pallet, as shown in Figure 2-1. Align the tines with the

center of gravity to prevent the equipment from falling over.

Figure 2-1 Inserting and moving

When moving the indoor unit, keep the obliquity within the range from 75° to 105°, as shown in Figure 2-2.

105

75

Figure 2-2 Moving obliquity

2.1.2 Unpacking

The cabinet uses packing of honeycomb cardboard and winding stretch film. Move the product to the place closest to

the final installation site before unpacking the unit.

Follow the procedures below to unpack the unit:

1. First remove the top cover and the winding stretch film, and then remove the honeycomb cardboard, as shown in

Figure 2-3.

6 Chapter 2 Mechanical Installation

Liebert CRV+ Series Air Conditioner User Manual

Top cover

1. Remove

the top

cover .

2. First

remove the

winding

stretch film,

and then

remove the

honeycomb

cardboard.

Honeycomb

cardboard

Honeycomb

cardboard

Figure 2-3 Unpacking the outer package

2. Removing the pallet.

The unit is fixed onto the packing pallet with M8 × 20 and M8 × 80 screws, as shown in Figure 2-4. You can use

17mm open-end spanner, ratchet spanner or sleeve to remove the screws.

Hexagon head bolt

GB/T 5782-2000_M8

×

80

Screw GB9074_13-88_M8

×

20

Figure 2-4 Screws on pallet

2.1.3 Inspection

After unpacking the product, check against the packing list that the fittings are complete and that the components are

intact. If any parts are found missing or damaged, please report to the carrier immediately. If any covert defects are

found, please report to the carrier and the local office of the distributor.

2.2 Installation Notes

To realize the designed performance and maximize the product life, correct installation is vital. This section should be

applied in conjunction with the prevailing industry standards of mechanical and electrical installation.

1. The Liebert CRV+ series 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.

2. Before the installation, make sure that the installation environment meets the requirements (see 1.6

Environmental Requirements) and confirm whether the building needs to be transformed to accommodate the

construction work of piping, wiring and ventilation ducts.

3. Follow the design drawings strictly when installing the equipment, and reserve space for daily maintenance and

service. The manufacturer’s engineering dimension drawings can be served as a reference.

Chapter 2 Mechanical Installation 7

Liebert CRV+ Series Air Conditioner User Manual

2.3 System Installation Arrangement

2.3.1 Overall System Arrangement

The overall system arrangement of the Liebert CRV+ series air conditioner is shown in Figure 2-5.

Discharge temperature sensor

Check valve

Ball valve

Traps* (Every

7.5m of

vertical lift)

Scroll compressor

Discharge line

High pressure

switch

Suction line

Suction

temperature

sensor

Sight glass

Filter drier

Distributor

Evaporator

coil

Condenser coil

Check

valve+

Low pressure sensor

Check

valve

Ball valve High pressure sensor

Check valve

Figure 2-5 Overall system arrangement

 Note

1. For the sake of convenience, the single system is used as an example to describe the double system.

2. : Factory piping.

3. : Field piping (by technical personnel).

4. *: These components are not supplied by Emerson, but are recommended for normal circuit operation and maintenance.

5. +: These components are required to add in field when the pipe equivalent length exceeds 30m.

2.3.2 System Installation Illustration

The unit installation mode is shown in Figure 2-6 and Figure 2-7.

8 Chapter 2 Mechanical Installation

Liebert CRV+ Series Air Conditioner User Manual

 Note

1. When the condenser is installed higher than the compressor (see Figure 2-6), a back bend should be fitted on the discharge pipe

and liquid pipe of the condenser, to avoid refluence of liquid refrigerant upon stopping.

2. When installing the back bend, ensure that the top end of the back bend is installed higher than the highest copper pipe of the

condenser.

Back bend (must be higher than the

highest copper pipe of the condenser)

Heat insulation floor Floor

Sealed

Raised floor

Humidifier

water in

Condensed

water out

Indoor unit

Liquid line (avoid exposure to direct sunlight)

Trap

Slope discharge

Max. 7.5m

Max. 30m

Outdoor unit

Figure 2-6 Condenser installed higher than compressor

Heat insulation floor Floor

Sealed Raised floor

Humidifier

water in

Condensed

water out

Indoor unit

Slope liquid

Min. 8m

Slope

discharge

Outdoor unit

Figure 2-7 Compressor installed higher than condenser

2.3.3 Mechanical Parameters

Indoor unit

The mechanical parameters of the indoor unit are shown in Figure 2-8 and Table 2-1.

Chapter 2 Mechanical Installation 9

Liebert CRV+ Series Air Conditioner User Manual

H

W

D

Figure 2-8 Mechanical parameters of indoor unit (unit: mm)

Table 2-1 Mechanical parameters of indoor unit

Model Dimensions (W × D × H) (mm) Net weight (kg)

CR025 300 × 1100 × 2000 270

CR035 600 × 1100 × 2000 350

Base plate pipe outlet locations & dimensions

The locations of the pipe inlets and outlets on the unit base plate are shown in Figure 2-9. See Table 2-2 for their

dimensions.

a

b

c

gf

A

B

C

D

E

d

eA: Drain hole

B: Liquid pipe hole

C: Discharge pipe hole

D: Cable entry hole

E: Water inlet hole

Figure 2-9 Locations of base plate pipe outlet

Table 2-2 Locations and dimensions of base plate pipe outlet (unit: mm)

Dimension

Model a b c d e f g

CR025 80 80 50 115 45 182 99

CR035 48 62 45 127 49 277 210

10 Chapter 2 Mechanical Installation

Liebert CRV+ Series Air Conditioner User Manual

Top plate pipe outlet locations & dimensions

The locations of the pipe inlets and outlets on the unit top plate are shown in Figure 2-10. See Table 2-3 for their

dimensions.

a

b

c

CR035

f

A

B

C

D

E

g

e

A: Water inlet hole B: Drain hole C: Liquid pipe hole

D: Discharge pipe hole E: Cable entry hole 1 F: Cable entry hole 2

a

b

c

gf

A

B

C

D

E

d

e

F

CR025

Figure 2-10 Locations of top plate pipe outlet

Table 2-3 Locations and dimensions of top plate pipe outlet (unit: mm)

Dimension

Model a b c d e f g

CR025 40 80 40 125 100 45 105

CR035 37.5 47.5 71 233 137 153 119

Front air outlet locations & dimensons

The front air outlet locations & dimensions are shown in Figure 2-11.

1895

550 250

CR025CR035

1895

Figure 2-11 Front air outlet locations & dimensions (unit: mm)

Chapter 2 Mechanical Installation 11

Liebert CRV+ Series Air Conditioner User Manual

 Note

To prevent damage of power cable, the cable entry hole is fitted with bushing for protection.

2.4 Installing Indoor Unit

2.4.1 Equipment Room Requirement

The requirements on the equipment room are as follows:

1. Damp proof and heat preservation work must be well done to make sure that the environment control system in the

air conditioner room 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 or damp proof coating.

3. The outdoor air that enters the equipment room should be reduced to a minimum, better below 5% of the total

indoor airflow, as it may increase the load of heating, cooling, humidifying and dehumidification of the system.

4. All the doors and windows should be closed and the openings should be as narrow as possible.

 Note

The Liebert CRV+ series air conditioner is a professional device, and the indoor unit is prohibited to be used in an open atrocious

outdoor environment.

2.4.2 Installation Space

The Liebert CRV+ series air conditioner is a set of full-featured steam compressor refrigerating air-cooled unit. It is

recommended to be installed in a row of cabinets with high heat density and ‘hot aisle & cold aisle’ arrangement.

Maintenance space requirement

In normal condition, leave more than 600mm of maintenance space at the front and the rear of the air condition unit,

as shown in Figure 2-12.

1945

600

Figure 2-12 Maintenance space of the unit (unit: mm)

12 Chapter 2 Mechanical Installation

Liebert CRV+ Series Air Conditioner User Manual

Table 2-4 Minimum maintenance space (unit: mm)

Location CR025 CR035

Front 600 600

Rear 600 600

Note: the space is used for regular maintenance, such as replacing filter, fan, electrode humidifier and so on

2.4.3 Installation Procedures

The Liebert CRV+ air conditioner is used between racks, and at least one side of it is adjacent to server cabinet.

Levelling the cabinet

After all components of the cabinet have been installed, you need to level the cabinet.

The procedures for levelling the cabinet are as follows:

1. Place the cabinet on an open ground.

2. Use a moveable wrench to loosen the fixing nuts on the four feet bolts (see Figure 2-13) clockwise in sequence.

3. Rotate the hexagon bolts on the bottom of the feet clockwise or counter clockwise till the feet rises or drops to an

optimal position, and use a gradienter to ensure that the cabinet is in a level state, as shown in Figure 2-13.

.

Closkwise

Hexagon bolt

Fixing nut

Counter closewise

or clockwise

The feet rise or drop

Figure 2-13 Levelling the cabinet

4. Screw down the fixing nuts on the feet bolts counter clockwise, and the levelling is finished.

If the machine room has mounting bracket, and its width does not exceed 30mm, you need to remove the feet and fix

the cabinet onto the mounting bracket.

Removing feet and fixing cabinet

 Note

To avoid personal injury and cabinet damage, two persons are required to perform the operation together.

1. Remove the feet:

1) Use a moveable wrench to loosen the fixing nuts on the four feet bolts clockwise in sequence.

2) Rotate the hexagon bolts on the bottom of the feet clockwise till the feet drops from the cabinet frames.

2. Fix the cabinet:

The cabinet provides two holes (diameter: 10mm) respectively on its top, bottom, front and rear, as shown in

Figure 2-14. Install bolts in the four bottom holes to fix the cabinet onto the floor bracket of the machine room, and

install bolts in the four top holes to connect the cabinet with the top bracket of the machine room.

Chapter 2 Mechanical Installation 13

Liebert CRV+ Series Air Conditioner User Manual

Top fixing hole

Bottom fixing hole

Figure 2-14 Fixing holes of cabinet

Cabinet connection

The cabinet connectors are provided in accessories. You can connect the unit with adjacent cabinets through the

cabinet connectors.

 Note

Before connecting the cabinet, please level the cabinet first. Refer to Levelling The Cabinet in this section for the method.

Procedures for connecting the cabinet:

1. Loosen the fixing screw of the cabinet connector on the cabinet frame, and rotate the cabinet connector 90° to

horizontal position, as shown in Figure 2-15.

Cabinet

connector

Cabinet

connector

Figure 2-15 Rotating the cabinet connector

2. Use the provided M5 countersunk head screws to fix the cabinet connector in the installation holes on the cabinet

frame, as shown in Figure 2-16. When connecting the racks without using the split plate, use the installation holes of

the cabinet connector to connect the racks.

14 Chapter 2 Mechanical Installation

Liebert CRV+ Series Air Conditioner User Manual

A

A amplified

Cabinet connector

Installation

hole

M5 countersunk

head screw

Figure 2-16 Schematic diagram for connecting the cabinet

3. Install the other three cabinet connectors according to the same method.

2.5 Piping

2.5.1 Connecting Air-Cooled Unit Pipe

All joints of the cooling pipes must be silver-brazed. Standard industry procedures must be followed in selecting,

laying, and fixing the pipes, and vacuuming the system and charging refrigerant. Take pipeline pressure drop, oil

return to the compressor and minimization of noise and vibration into consideration during design and construction.

General

The recommended pipe sizes are ‘equivalent lengths’ (see Table 2-6 for equivalent lengths of partial components),

with the resistance caused by bends taken into account. The installer should confirm that the sizes are appropriate for

the site conditions.

1. If the one-way equivalent length exceeds 30m, or if the vertical distance between indoor unit and outdoor unit

exceeds the values in Table 2-5, consult Emerson before the installation to confirm whether a pipe extension kit is

needed.

Table 2-5 Vertical distance between indoor unit and outdoor unit

Relative position Value

Outdoor unit higher than indoor unit Max.: +30m

Outdoor unit lower than indoor unit Max.: -8m

2. The pipe sizes recommended in Table 2-6 are ‘equivalent lengths’, with the resistance caused by bends and valves

taken into account. The installer 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 should be installed for every 7.5m of vertical distance. Please consult Emerson for details.

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Vertiv Liebert CRV+ Series Air Conditioner User manual

Vertiv Liebert CRV+ Series Air Conditioner User manual

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