APC ACRD101, ACRD100 User Manual

Operation and

Maintenance

InRow® RD 10kW

Air Cooled

ACRD100

ACRD101

This manual is available in English on the enclosed CD.

Dieses Handbuch ist in Deutsch auf der beiliegenden CD-ROM verfügbar.

Deze handleiding staat in het Nederlands op de bijgevoegde cd.

Este manual está disponible en español en el CD-ROM adjunto.

Ce manuel est disponible en français sur le CD-ROM ci-inclus.

Questo manuale è disponibile in italiano nel CD-ROM allegato.

本マニュアルの日本語版は同梱の CD-ROM からご覧になれます。

Instrukcja Obs

O manual em Português está disponível no CD-ROM em anexo.

Данное руководство на русском языке имеется на прилагаемом компакт-диске.

您可以从包含的 CD 上获得本手册的中文版本。

您可以从付属的ＣＤ上获得本手册的中文版本。

ługi w jezyku polskim jest dostepna na CD.

동봉된 CD 안에 한국어 매뉴얼이 있습니다 .

American Power Conversion Legal Disclaimer

The information presented in this manual is not warranted by the American Power Conversion Corporation to be authoritative, error free, or complete. This publication is not meant to be a substitute for a detailed operational and site specific development plan. Therefore, American Power Conversion Corporation assumes no liability for damages, violations of codes, improper installation, system failures, or any other problems that could arise based on the use of this Publication.

The information contained in this Publication is provided as is and has been prepared solely for the purpose of evaluating data center design and construction. This Publication has been compiled in good faith by American Power Conversion Corporation. However, no representation is made or warranty given, either express or implied, as to the completeness or accuracy of the information this Publication contains.

IN NO EVENT SHALL AMERICAN POWER CONVERSION CORPORATION BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL, OR INCIDENTAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS, CONTRACT, REVENUE, DATA, INFORMATION, OR BUSINESS INTERRUPTION) RESULTING FROM, ARISING OUT, OR IN CONNECTION WITH THE USE OF, OR INABILITY TO USE THIS PUBLICATION OR THE CONTENT, EVEN IF AMERICAN POWER CONVERSION CORPORATION HAS BEEN EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. AMERICAN POWER CONVERSION CORPORATION RESERVES THE RIGHT TO MAKE CHANGES OR UPDATES WITH RESPECT TO OR IN THE CONTENT OF THE PUBLICATION OR THE FORMAT THEREOF AT ANY TIME WITHOUT NOTICE.

Copyright, intellectual, and all other proprietary rights in the content (including but not limited to software, audio, video, text, and photographs) rests with American Power Conversion Corporation or its licensors. All rights in the content not expressly granted herein are reserved. No rights of any kind are licensed or assigned or shall otherwise pass to persons accessing this information.

This Publication shall not be for resale in whole or in part.

Contents

General Information........................................................ 1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Symbols used in this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Cross-reference symbol used in this manual . . . . . . . . . . . . . . . . 1

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Commissioning ............................................................... 3

Inspection Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Initial inspection checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Electrical inspection checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mechanical inspection checklist . . . . . . . . . . . . . . . . . . . . . . . . . . 5

User interface inspection checklist . . . . . . . . . . . . . . . . . . . . . . . 6

Start-up inspection checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Final inspection checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Charging With Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Calculating R410A charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Charging the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Compressor Oil Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Oil charging procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Operation ....................................................................... 12

Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Using the Display Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Scrolling status screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Main menu screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Navigating the main menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Navigating the sub-menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Using the Path statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Password entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Start the cooling unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Stop the cooling unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

General Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cooling unit configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

InRow RD 10 kW Air Cooled Operation and Maintenance i

Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

View the state of input and output contacts . . . . . . . . . . . . . . . . 17

Edit the normal state of input and output contacts . . . . . . . . . . 17

Cooling Group Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Configure the cooling group . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Identify the cooling unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Configure Modbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Control the Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

PID settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Tune the PID loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Run hours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Service intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Display Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Password and time-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Adjust display settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Display units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Network Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Configure network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

View Status Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Scrolling status screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Cooling unit status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Cooling group status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

About the cooling unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

View the event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Clear the event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Respond to Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

View active alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Clear active alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Alarm messages and suggested actions . . . . . . . . . . . . . . . . . 29

ii InRow RD 10 kW Air Cooled Operation and Maintenance

Network Management Card.......................................... 32

Quick Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

TCP/IP configuration methods . . . . . . . . . . . . . . . . . . . . . . . . . . 32

APC Device IP Configuration Wizard . . . . . . . . . . . . . . . . . . . . . 33

.ini file utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

BOOTP & DHCP configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Local access to the control console . . . . . . . . . . . . . . . . . . . . . . 35

Remote access to the control console . . . . . . . . . . . . . . . . . . . . 35

Control console . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Access a Configured Network Management Card . . . . . . . . . . . . . . 37

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Web interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Telnet and SSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Simple Network Management Protocol (SNMP) . . . . . . . . . . . . . 39

FTP/SCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Modbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Recover From a Lost Password . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Maintenance .................................................................. 41

Monthly Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Quarterly Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Functional tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Semi-Annual Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . 43

Cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Troubleshooting............................................................ 44

InRow RD 10 kW Air Cooled Operation and Maintenance iii

General Information

Overview

Note the definitions for the icons here and be observant for them throughout this manual. They are intended to call attention to potential hazards and important information.

Symbols used in this manual

Electrical Hazard: Indicates an electrical hazard which, if not avoided, could result in

injury or death.

Danger:

death.

Warning: Indicates a hazard which, if not avoided, could result in personal injury or damage to product or other property.

Heavy: Indicates a heavy load that should not be lifted without assistance.

Caution: Indicates a potential hazard which, if not avoided, could result in damage to the

equipment or other property.

Tip Hazard:

moving.

Note: Indicates important information.

Indicates that more information is available on the same subject.

Indicates a hazard which, if not avoided, could result in severe personal injury or

This equipment is easily tipped. Use extreme caution when unpacking or

Cross-reference symbol used in this manual

See another section of this document or another document for more information on this subject.

1InRow RD 10 kW Air Cooled Operation and Maintenance

Safety

Read and adhere to the following important safety considerations when working with this cooling unit.

Note: All work must be performed by American Power Conversion (APC personnel only.

Caution: Keep your hands, clothing, and jewelry away from moving parts. Check the equipment for foreign objects before closing the doors and starting the equipment.

Heavy: The equipment is heavy. For safety purposes, at least two people must be present when moving this equipment.

Tip Hazard: This equipment has a high center-of-gravity. Use extreme caution when moving.

) authorized

Electrical Hazard:

Warning: Before performing any service, properly de-energize and remove access to

the equipment (Lockout). Physically label the equipment as intentionally out of service (Tagout).

Do not wear jewelry when working near energized components.

InRow RD 10 kW Air Cooled Operation and Maintenance2

Commissioning

Warning: APC authorized personnel must perform the following procedures.

Electrical Hazard: Perform Lockout/Tagout procedures on the cooling unit before

servicing the cooling unit. Failure to remove power before servicing this equipment could result in serious injury or death.

After installation is complete, verify that all components are working properly and that the cooling unit is ready to begin operation.

Inspection Checklists

Initial inspection checklist

The initial inspection ensures that the cooling unit has been properly installed, the location of the cooling unit has been properly prepared, and the cooling unit is free of damage.

Warning: The cooling unit operates under pressure. Take proper safety precautions when connecting gauges or servicing piping. Warning: Do not operate the cooling unit with any cover, guard, door, or panel removed unless the instructions indicate otherwise. Then, proceed with extreme caution. Warning: Do not run service utilities in front of the fan outlets.

unit is required for service access. To roll the cooling unit out of the row, there must be a minimum of 1200 mm (48 in) of clear floor space in front of or behind the cooling unit. Out-of-row service requires 760 mm (30 in) of side clearance in addition to the front and rear clearance.

Ensure that:



The installation procedure is complete according to the installation manual.

The walls, floor, and ceiling of the room where the cooling unit is located are sealed with a vapor barrier.

There is no evidence of damage to the cooling unit.

The cooling unit is level and joined to the adjacent racks.

The cooling unit is not installed at the open end of a row.

The clearance around the cooling unit is in accordance with local and national codes and regulations as well as the installation manual.

Caution: The vapor barrier minimizes moisture infiltration. Without a vapor barrier, it will be difficult to maintain the humidity in the room.

Caution: Do not introduce unconditioned outside air into the space.

Note: A minimum of 900 mm (36 in) of clear floor space in front of and behind the cooling

3InRow RD 10 kW Air Cooled Operation and Maintenance

Electrical inspection checklist

The electrical inspection verifies that all electrical connections are secure and correct and that the cooling unit is properly grounded.

Electrical Hazard: All electrical wiring must comply with local and national codes and regulations. Electrical Hazard: The equipment must be grounded (do not use a water-pipe ground).

Ensure that the:



Incoming voltages match the phase and voltage listed on the nameplate.

Electrical wiring complies with local and national codes and regulations.

The cooling unit is properly grounded.

Electrical connections are tight, including contactors, terminal blocks, controllers, switches, relays, auxiliary devices, and field connections.

InRow RD 10 kW Air Cooled Operation and Maintenance4

Mechanical inspection checklist

The mechanical inspection verifies that all mechanical components and connections are secure and tight and ready for start-up and system charging. The inspection ensures that field piping is properly installed to promote oil return to the compressor.

Warning: The equipment is shipped from the factory with a nitrogen holding charge. Remove the nitrogen holding charge using the Schrader valves located on the internal refrigerant piping.

Caution: Improperly installed piping may result in improper operation and possible damage to the cooling unit or surrounding equipment.

Ensure that the:



Fans are turning freely and that the blades are not distorted or bent.

Condensate drain line is at least the size of the drain connection.

Piping joints are tight.

Mechanical connections are tight, including compressor and receiver rotolock connections.

Refrigerant piping size is correct according to the line size table in the installation manual.

Vertical, horizontal, and total run lengths of the liquid, discharge, and suction lines are recorded.

Number of 45- and 90-degree bends in the refrigerant piping are recorded.

Field-installed traps and piping are in accordance with the installation manual and follow proper piping practices.

Refrigerant piping is adequately supported and isolated when necessary.

Field-installed service valves are open.

Pressure relief valve is installed in accordance with the installation manual as well as local and national codes and regulations.

Piping in the building and on the roof is properly insulated.

Covers and guards are in place.

5InRow RD 10 kW Air Cooled Operation and Maintenance

User interface inspection checklist

The user interface inspection verifies that the sensors and internal communications links of the cooling unit are installed properly.

Ensure that:



An A-Link bus is connected to each cooling unit in the group and a terminator is plugged into all unused A-Link connectors.

The input contacts and output relays are connected correctly.

The building management system is connected correctly and a terminator is wired into the final unit between Modbus D0 and Modbus D1.

The rack temperature sensors are installed correctly.

The network port is connected correctly and an IP address has been assigned to the equipment.

Start-up inspection checklist

The start-up inspection ensures that the cooling unit is operating properly after the initial start-up. This inspection verifies that all modes of operation are working correctly and that the cooling unit is ready for normal operation.

While the cooling unit is operating, ensure that the:



Cooling unit is free from malfunctions, unusual vibrations, or other irregularities in each mode of operation.



Cool cycles engage.

Air filters are clean and free of debris. Replace air filters with APC part number 875-2013.

Clogged filter alarm is operating properly: Cover 1/3 of the filter area and monitor alarm performance.

Compressor suction and discharge pressures are recorded.



Sight glass moisture sensor is green.



Final inspection checklist

The final inspection verifies that the system is clean and the start-up form has been sent to APC.

Ensure that:



System is clean and free from debris.

Packaging materials are disposed of properly.

Start-up form was completed and sent to APC.

InRow RD 10 kW Air Cooled Operation and Maintenance6

Charging With Refrigerant

Calculating R410A charge

Use the following table and formula when calculating the total R410A charge.

Selected ambient

Condenser

model

ACCD75214

ACCD75215

ACCD75216

ACCD75218, ACCD75220*

ACCD75217, ACCD75219

* ACCD75220 is CCC certified for use in China.

ACR pipe size (OD)

1/2 in

5/8 in

temp. in

°C (°F)

35 (95) 2.2 (4.9) 5.48 (12.1) 5.85 (12.9) 6.03 (13.3) 6.17 (13.6) 6.30 (13.9)

40 (105) 2.2 (4.9) 5.48 (12.1) 5.85 (12.9) 6.03 (13.3) 6.17 (13.6) 6.30 (13.9)

46 (115) 3.85 (8.5) 9.57 (21.1) 10.16 (22.4) 10.48 (23.1) 10.70 (23.6) 10.93 (24.1)

35 (95) 1.36 (3) 3.08 (6.8) 3.26 (7.2) 3.36 (7.4) 3.45 (7.6) 3.49 (7.7)

40 (105) 1.36 (3) 3.08 (6.8) 3.26 (7.2) 3.36 (7.4) 3.45 (7.6) 3.49 (7.7)

46 (115) 2.27(5) 6.12 (13.5) 6.53 (14.4) 6.71 (14.8) 6.89 (15.2) 7.03 (15.5)

Type of fitting or valve - Equivalent length of pipe in m (ft)

Gate valve Standard elbow 90 ° Reduced coupling Side outlet T Angle valve

0.18 (0.6) 0.43 (1.4) 0.43 (1.4) 0.82 (2.7) 1.83 (6.0)

0.21 (0.7) 0.49 (1.6) 0.49 (1.6) 0.91 (3.0) 2.13 (7.0)

Condenser

summer

charge in

kg (lb)

Condenser flooded charge in kg (lb) for different

4°C (40°F)

minimum outdoor ambient temperatures

-7°C

(20°F) -18°C (0°F)

-29°C

(-20°F)

-40°C

(-40°F)

Recommended Line Sizes

Equivalent length m (ft)

15 (50)

30 (100

16 (150)

)

Line Type Air-cooled ACRD units

Discharge line (horizontal) Discharge line (vertical) Liquid line

5/8 inOD ACR 1/2 in OD ACR 1/2 in OD ACR

Note: All refrigerant pipes must be straight ACR to have 39 bar (565 psig) or above MWP. Equivalent length of 1/2 in OD discharge line pipe should be kept less than 18 m (60 ft). Total equivalent length of the discharge line should be less than 46 m (150 ft) to prevent excessive hot gas pressure drop which can increase the discharge pressure during hot summer days. To have 61 m (200 ft) total equivalent discharge pipe length the load must be reduced by 5%.

Total charge = Equipment charge + condenser summer charge + condenser flooded charge (for minimum possible ambient temperature) + liquid R410A in liquid pipe

Equipment charge: 1.6 kg (3.5 lb)

7InRow RD 10 kW Air Cooled Operation and Maintenance

Quantity of R410A in 1/2 in OD liquid line: (area) x (length in ft) x (density): 0.0010554 (ft2) x L (ft) x

61.0 (lbm/ft

)

Density of liquid R410A at 40.6

°C (105°F) and 260 psig: 0.98 g/cm

Cross sectional area for 1/2 in OD pipe is 0.0010554 ft

(61.0 lbm/ft3 )

Liquid line charge for 1/2 in OD ACR copper tube: 0.095 kg/m (0.0644 lb/ft).

Cross sectional area for 5/8 in OD pipe is 0.001619 ft

Quantity of R410A in 5/8 in OD liquid line: (area) x (length in ft) x (density): 0.001619 (ft

61.0 (lbm/ft

) x L (ft) x

Liquid line charge for 5/8 in OD ACR copper tube: 0.146 kg/m (0.099 lb/ft).

Example: Calculate the total R410A charge for an FCB5 condenser with 25 ft of 1/2 in OD liquid piping. Minimum outdoor design temperature is -28.9

°C (-20°F).

Note: Imperial units are used in this example.

Total R410A charge: 3.5 + 4.9 + 13.6 + (25*0.0644) = 23.6 lb.

InRow RD 10 kW Air Cooled Operation and Maintenance8

Charging the equipment

Caution: Fast charge of liquid refrigerant through the suction

port may damage the compressor.

Caution: This procedure is to be done by APC-trained personnel only.

R410A is a blend refrigerant. When charging equipment with blend refrigerants, only liquid refrigerant must be charged.

Caution: Charging with other than liquid R410A refrigerant may damage the system.

1. Ensure the ball valves are open.

2. Confirm the calculated system charge.

3. Connect the refrigerant cylinder to the charging or gauge port on the receiver outlet valve. Open the receiver valve approximately half way.

4. Charge liquid refrigerant into the high side of the system until the system pressures equalize. While the unit is NOT operational, charge liquid to the suction (low side) line to simply equalize pressures throughout the system DO NOT start the system until the pressure equalizes. Please note charging liquid to the suction port during operation may damage or reduce the life of the compressor.

5. Prior to starting the system, make sure all system valves are open and the system high side pressure remains above 24.8 bar (360 psi). This may require blocking the condenser inlet slightly. Remove any blocking panels after charging is complete.

6. Start the cooling unit. See “Start the cooling unit” on page 15 for more information.

7. Once the system is operational, front seat the receiver service valve and continue charging liquid at the Schrader port down stream of the receiver shutoff valve, until the calculated charge is complete. When this procedure is complete, fully back seat the receiver shutoff valve. Leave charging hoses in place in the event additional charging is required.

8. Charge the rest of the calculated liquid refrigerant very slowly through the suction port.

9. Verify that the sightglass is clear. If there is excessive bubbling in the sightglass, make sure the system high side pressure is above 23.4 bar (340 psi) and Superheat and Subcooling are within parameters (10-12 for Superheat and 8-10 for Subcooling). If additional charging is required, front seat the receiver shutoff valve and weigh in the additional charge at the Schrader port.

Note: Since good performance during low ambient temperatures depends on proper refrigerant charge, it is very important that this phase of the installation procedure be done carefully. Poor system performance can be due to too little or too much charge.

9InRow RD 10 kW Air Cooled Operation and Maintenance

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