Data Aire DARC 03 Manuel d'instructions

CONGRATULATIONS ON THE SELECTION OF A DATA AIRE PRECISION ENVIRONMENTAL CON-

TROL SYSTEM. PROPER INSTALLATION, OPERATION AND MAINTENANCE OF THIS EQUIP-

MENT WILL ENSURE YEARS OF OPTIMAL PERFORMANCE.

NOTE: This manual is intended to assist trained service personnel by providing neces-

sary guidelines for this particular equipment. Service to Data Aire units should be done

by qualied individuals with an adequate background in areas such as HVAC, electrical,

plumbing and electronics, as applicable.

WARNING: Service performed by unauthorized or unqualied technicians may void manu-

facturers’ warranties and could result in property damage and/or personal injury.

Special care should be given to those areas where these symbols

appear.

Data Aire, Inc. reserves the right to make design changes for the purpose of

product improvement or to withdraw any design without notice.

TABLE OF CONTENT

1.0 INTRODUCTION................................................................................................. 5

1.1 Model Identication ........................................................................................ 5

1.2 Inspection....................................................................................................... 5

1.3 Paperwork...................................................................................................... 5

1.4 Storage........................................................................................................... 6

1.5 Locating the Remote Heat Exchanger ........................................................... 6

1.6 Leg Assembly................................................................................................. 7

1.7 Rigging........................................................................................................... 7

1.8 Installation...................................................................................................... 8

1.8.1 Installation Checklist .................................................................................. 8

2.0 PIPING ............................................................................................................ 10

2.1 Discharge Lines ........................................................................................... 10

2.2 Liquid Lines.................................................................................................. 10

2.3 Field Piping, Remote Condenser Above Evaporator.....................................11

2.4 Field Piping, Remote Condenser Below Evaporator.....................................11

2.5 Condenser Connection Sizes....................................................................... 12

2.6 Leak Testing ................................................................................................. 13

2.7 Evacuation ................................................................................................... 13

3.0 ELECTRICAL CONNECTIONS......................................................................... 14

3.1 Electrical Service.......................................................................................... 14

3.2 Nameplate Ratings....................................................................................... 14

3.3 Grounding .................................................................................................... 14

3.4 Voltage Tolerance......................................................................................... 14

3.5 Phase........................................................................................................... 15

3.6 Auxiliary Control Wiring................................................................................ 15

3.7 Wiring Diagrams........................................................................................... 15

4.0 CHARGING....................................................................................................... 16

4.1 Fan Speed Control/Fan Cycling................................................................... 16

4.2 Ambient Sensing Thermostats ..................................................................... 16

4.2.1 Typical Ambient Thermostats Factory Settings........................................ 16

4.3 Charging with Fan Speed Control................................................................ 17

4.3.1 R-410a – Charging/Installation Work Procedures.................................... 18

4.4 Flooded Systems ......................................................................................... 18

4.4.1 Charging Flooded Systems...................................................................... 18

4.5 Refrigerant Handling .................................................................................... 19

4.6 Condenser with EC Motor Axial Fan(s) (Option) .......................................... 19

4.6.1 EC Motor Speed Adjustments.................................................................. 19

5.0 WARRANTY...................................................................................................... 20

6.0 PREVENTIVE MAINTENANCE ........................................................................ 20

6.1 Maintenance Functions................................................................................ 20

6.2 Electronically commutated (EC) Fan Trouble Shooting ............................... 20

6.3 Coil Cleaning................................................................................................ 20

6.3.1 When to Clean ......................................................................................... 20

6.3.2 What to Use ............................................................................................. 20

6.3.3 How to Clean ........................................................................................... 21

7.0 LINE SIZES....................................................................................................... 21

8.0 CONTACT DATA AIRE ...................................................................................... 22

5 • Air Cooled Condenser User Manual

1.0 INTRODUCTION

The Data Aire air-cooled condenser is low-prole direct-drive propeller or axial fan-type heat ex-

changer unit suitable for mounting outdoors. It provides for the heat rejection of either one or two

separate refrigeration circuits, matching heat rejection capacity varying with the outdoor ambient

temperatures and with each corresponding compressors heat rejection requirements. Constructed

with an aluminum cabinet and a copper-tube aluminum n coil, the unit is quiet and corrosion re-

sistant. The condenser is quickly and easily installed, because all internal wiring is completed at

the factory with only electrical connections to be made at the job site. All electrical connections and

controls are enclosed in an integral weatherproof electrical control section of the condenser.

1.1 ModelIdentication

1.2 Inspection

This Data Aire unit has been factory run tested and has passed a comprehensive inspection prior to

packaging and shipment ensuring it arrives in excellent condition. However, shipping damage can

occur and a visual inspection of the outer crating immediately upon delivery should be performed.

Note any external damage or other transportation damage on the freight carrier’s forms. Inspect the

unit itself for internal damage. A claim should be led with the shipping company if the equipment

is damaged or incomplete.

Loose items such as remote control panels, disconnect switch handles or other items are packed

inside the unit. Refer to the yellow shipping tag located on the door for details.

NOTE: Freight damage claims are the responsibility of the purchaser. Action to recover

losses should be led immediately. Please notify factory personnel of any claims.

1.3 Paperwork

Each Data Aire unit ships with a start-up sheet that should be completed during installation. Return

the completed startup sheet to the factory to validate the warranty. Also included in the paperwork

is a warranty/information packet that provides important wiring diagrams, specic component lit-

erature, warranty registration cards and other valuable paperwork including a copy of this Instal-

lation, Operation and Maintenance Manual (IOM). A yellow tag is attached to the outside panel to

indicate articles that may have been packaged and shipped loose within the unit that are not factory

mounted.

6 • Air Cooled Condenser User Manual

NOTE: It is the responsibility of the installing contractor to return the start-up sheet and

warranty registration card to Data Aire for proper activation of the unit warranty. Failure

to do so may cause delays and in some cases void the warranty.

WARNING: This equipment may contain substance that has been deemed harmful

to public health and the environment. Venting of refrigerants to the atmosphere is

illegal. Refrigerant recovery devices must be used when installing and/or servicing

these types of products.

1.4 Storage

Data Aire equipment comes ready for immediate installation. However, in some instances, it may

be necessary to store the equipment for a period of time. If you must store the equipment it should

be done in a dry area, out of the weather, protected from freezing temperatures, protected from

damage by other equipment in storage, or transportation equipment. Avoid stacking and frequent

relocation.

If equipment is stored for longer than 30 days special precautions must be taken to avoid coil dam-

age. All coils should be charged and sealed with a low pressure (less the 25 PSIG) inert gas, such

nitrogen. This prevents contaminants from entering the coils. When the seal is broken at installa-

tion, the rush of escaping gas veries the coil is still leak free. If coils are not charged and sealed,

condensation mixes with air pollutants forming a weak acid and over time can cause pinhole leaks

to develop in coil tubes.

When equipment is installed after storage, caution should be taken to inspect and replace damaged

components, if required. All moving parts should be hand tested to ensure they are free and clear

prior to start-up.

1.5 Locating the remote heat exchanger

Remote air-cooled condensers (i.e., heat exchangers) should be located in secure areas where

service is easily accessible. Areas where public access is available should be avoided. Avoid areas

that contribute to ice and snow accumulation. The condenser may need to be elevated to ensure it is

above the snow line in certain regions of the country. Condensers should be located in clean areas

free from debris or foreign matter that could block the coil surface. Avoid areas of hot air or fume

exhaust. Condensers should not be located near steam vents.

Figure 1

7 • Air Cooled Condenser User Manual

Condensers should not be closer than 36 inches from a wall or any obstruction. With proper clear-

ance on all other sides units can be placed side by side. Additional units should be placed no closer

than 48 inches apart, see Figure 1. Avoid air recirculation conditions that could be caused by walls,

screening, etc. Do not connect ductwork to the coil inlet or fan outlet. Keep fan discharge away

from building air intakes.

The remote heat exchanger must be located in an area that will ensure airﬂow into and out of the

heat exchanger plus adequate service access clearance. Short circuiting of the airﬂow or the in-

take of warmer air from another unit will seriously degrade the performance of the air-cooled heat

exchanger.

Do not locate the heat exchanger in a location that is bordered by tall obstructions (i.e. higher than

10 feet) on no more than two sides. See Figure 1 for minimum clearance from obstructions and

between units. With proper clearance on all sides, two units can be placed side by side. Additional

units should be placed at least 48 inches apart.

Noise factors should be considered when locating an air-cooled heat exchanger. Proximity to win-

dows, walls and surrounding structures can cause objections by the occupants. An acoustical ex-

pert should be consulted when noise is of a particular concern.

Avoid installing units near occupied spaces, above or outside utility spaces and corridors whenever

possible in order to reduce sound transmission and/or vibration to occupied spaces. Refrigerant

piping should be ﬂexible enough to prevent transmission noise or vibration from the unit. Isolation

hangers should be used to prevent the transmission of vibration on all suspended (from the building)

refrigerant lines.

Air-cooled condensers should be placed at a level that is higher than the indoor evaporator. It is not

recommended to mount the condenser more than 10 feet below the evaporator. Excessive liquid

line pressure drop can cause poor evaporator performance.

1.6 Leg Assembly

The legs must be unbolted from their collapsed shipping position and extended prior to placing the

unit on its pad. Each leg extends down approximately 18” and reattaches using the same bolts.

NOTE: Failure to extend the legs will result in poor air distribution over the cooling coil

resulting in signicant capacity reduction and system failure.

Concrete pads are often used to provide support for the heat exchanger when set on the ground.

Bolt holes in the bottom of each leg can be used to anchor the unit. Units mounted on the roof

should be placed on rails designed to distribute the unit weight. Standard practices and local codes

should be followed in either instance.

1.7 Rigging

Outdoor condensers should be moved to their mounting location (typically rooftop) using a crane or

fork lift. Each fan section has heavy gage, steel leg supports with lifting holes at the top.

8 • Air Cooled Condenser User Manual

Do not lift with a choke sling around the unit. Spreader bars are recommended for lifting multiple fan

units (See Figure 2). Under no circumstances should the coil headers or piping be used for lifting

the unit. Ideally, the unit should be kept in its shipping crate until it is ready to be set in place.

WARNING: Use care when moving. Improper handling could result in injury. Proper

care should be taken when uncrating the unit. The packaging has wrapping bands with

sharp edges that are under tension, crating has staples and splinters. Proper protective

equipment should be worn by qualied personnel.

Figure 2

1.8 Installation

NOTE: There is no intent on the part of Data Aire, Inc. to dene local codes or statutes

which may supersede common trade practices. The manufacturer assumes no respon-

sibility for their interpretation. Consult local building codes and the National Electrical

Code (NEC) for special installation requirements.

1.8.1 Installation Checklist

As a precaution, review the following checklist to ensure proper operation:

• Check for any damage

• Check all wiring connections

WARNING: When preparing the equipment, proper care should be taken when uncrat-

ing the unit. The packaging has wrapping bands with sharp edges that are under ten-

sion, crating has staples and splinters. Proper protective equipment should be worn by

qualied personnel.

● Remove the metal strapping bands

● Remove the wooden crating

● Remove the protective plastic covering

WARNING: Before removing from the packaging inspect the unit for any damage.

Report any damage to the carrier and le a damage claim.

9 • Air Cooled Condenser User Manual

Only qualied and experienced service technicians should perform installation and maintenance on

this product. Equipment damage and personal injury can result from improper piping installation,

leak checking and improper handling.

This equipment is designed to operate properly and produce rated capacities when installed in ac-

cordance with industry standards. Failure to meet the following conditions could result in voiding

the warranty:

• System piping must be installed following industry standards for good piping practices

• System must be thoroughly leak checked before initial charging

• System power supply must meet voltage tolerance (see section 3.4)

• All controls and safety devices properly connected per wiring diagram

• Factory installed wiring must not be changed without written factory approval

Additionally, the refrigerant piping must comply with local code. After piping is completed all joints

(and connections) should be leak tested.

10 • Air Cooled Condenser User Manual

2.0 Piping

Refer to the Line Size chart (7.0 LINE SIZES) for a guideline to sizing refrigerant lines. The ultimate

responsibility for line size selection is that of the installing contractor or project engineer. Data Aire

does not assume this responsibility. The chart covers distances up to 200 equivalent feet. For in-

stallations greater than this distance refer to ASHRAE or similar references.

Note: Standard piping practice must be used to ensure proper oil return and e󰀩cient

operation. The interconnecting lines to the remote air-cooled condenser must be in-

stalled by a qualied refrigeration mechanic.

• Only use refrigerant grade copper tubing (ACR1 preferred)

• Soft solder joints are not acceptable

• Purge dry nitrogen through the lines while brazing

• Do not leave dehydrated piping or components open to atmosphere any longer than is re-

quired

Welded or sweat joints should be used. Piping must be supported within 18 inches of the inlet and

outlet connections on the units.

2.1 Discharge Lines

Discharge lines (also called hot gas lines) should be trapped at the top (inverted) and the bottom.

In addition, a trap should be installed for every 15 to 20 feet of vertical rise. Discharge line check

valves are highly recommended on all installations. Check valves should be installed 6 to 10 feet

from the compressor. See Figure 3

Proper design will minimize refrigerant pressure drop and will maintain su󰀩cient gas velocity to

carry oil through the condenser. Discharge line pressure drop should not exceed 6 PSI. Recom-

mended gas velocity for proper oil return is 1,000 FPM. Slope horizontal lines downward in the

direction of refrigerant ﬂow (1/2” for every 10 feet of line length).

2.2 Liquid Lines

Liquid line size is determined by pressure drop and velocity. The liquid line pressure drop for R-407C

should not exceed 5 PSI (35 kPa) or 9 PSI (62 kPa) for R-410A. The recommended liquid velocity

should be between 200 and 300 FPM (1 to 1.5 m/sec). To avoid excessive liquid line pressure drop,

the air cooled condenser should be located above or at the same level as the evaporator. Condenser

installations more than 15 feet below the evaporator are not recommended. Insulation of liquid lines

is not required but can be useful in preventing excessive sub-cooling or ﬂashing on long exposed

pipe runs.

1 The American refrigeration industry uses di󰀨erent copper pipe call ACR (air conditioning and refrigeration eld services) pipe, which is

sized directly by its outside diameter (OD) and a type letter indicating wall thickness. ACR pipe is manufactured without processing oils that would

be incompatible with the oils used to lubricate the compressors in the HVAC system

Ce manuel convient aux modèles suivants

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