Durastar DRAC16 Installation Manual

WARNING:

RECOGNIZE THIS SYMBOL AS AN INDICATION OF IMPORTANT SAFETY INFORMATION

WARNING

THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED, LICENSED SERVICE PERSONNEL FOR PROPER INSTALLATION, ADJUSTMENT, AND OPERATION OF THIS UNIT. READ THESE INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING INSTALLATION OR OPERATION. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATION, ADJUSTMENT, SERVICE, OR MAINTENANCE POSSIBLY RESULTING IN FIRE, ELECTRICAL SHOCK, PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH.

AIR COOLED CONDENSING UNITS

INSTALLATION INSTRUCTIONS

DRAC16 MODEL SERIES 16 SEER

FEATURING INDUSTRY STANDARD R-410A REFRIGERANT

Do not destroy this manual. Please read carefully and keep in a safe place for future reference by a serviceman.

[ ] indicates metric conversions.

92-21354-105-00 ( / )

Printed in USA

NOTE: Actual unit appearance may vary.

CONTENTS

1.0 IMPORTANT SAFETY INFORMATION........................... 3

2.0 GENERAL INFORMATION.............................................. 4

2.1 Introduction.................................................................................4

2.2 Importance of a Quality Installation............................................4

2.3 System Sizing and Selection......................................................4

2.4 Importance of Proper Indoor/Outdoor Match-Ups.....................5

2.5 Checking Product Received.......................................................5

Contents

2.6 Eciency Testing Notice.............................................................5

2.7 Compressor Break-In Notice......................................................5

3.0 Unit Specications..........................................................6

3.1 Model Number Nomenclature.....................................................6

3.2 Available Models.........................................................................6

3.3 Electrical and Physical Data....................................................... 7

4.0 Installation.......................................................................9

4.1 Tools & Refrigerants....................................................................9

4.1.1 Tools Required for Installation & Servicing R-410A Models.. 9

4.1.2 Specications of R-410A.......................................................9

4.1.3 Quick Reference Guide for R-410A.......................................9

4.2 Choosing a Location...................................................................10

4.2.1 Allowable Clearances............................................................ 10

4.2.2 Operational Issue Related to Unit Location...........................10

4.2.3 Corrosive Environments........................................................ 11

4.2.4 Customer Satisfaction Issues................................................11

4.3 Mounting Unit............................................................................. 11

4.3.1 Unit-Mounting Methods.........................................................11

4.3.2 High Wind and Seismic Tie-Down Methods..........................11

4.3.3 Elevating Unit........................................................................ 12

4.4 Refrigerant Line Set Selection....................................................13

4.4.1 Replacing Existing System....................................................13

4.4.2 Line Set Length and Fitting Losses....................................... 13

4.4.3 Liquid Line Selection............................................................. 13

4.4.4 Suction Line Selection...........................................................16

4.4.5 Long Line Length Considerations..........................................16

4.4.5.1 Determining if Long Line Set Length Requirements Apply..

4.4.5.2 Oil Return to Compressor.................................................16

4.4.5. 3 Refrigerant Migration During O Cycle / Crankcase Heater........ 16

4.4.5.4 Maximum Liquid Pressure Drop.......................................16

4.4.5.5 Liquid Line Refrigerant Flashing.......................................16

4.4.5.6 Compressor Oil Level Adjustment for Long Line Set Applications.

4.4.5.7 Capacity Losses............................................................... 17

4.5 Line Set Installation.....................................................................18

4.5.1 Important Tubing Installation Practices................................. 18

4.5.2 Relative Location of Indoor and Outdoor Units.....................19

4.5.2.1 Indoor and Outdoor Unit Near Same Level...................... 19

4.5.2.2 Outdoor Unit Below Indoor Unit.......................................20

4.5.2.3 Outdoor Unit Above Indoor Unit.......................................21

4.5.3 Tubing Connections...............................................................22

4.6 Initial Leak Testing...................................................................... 23

4.7 Evacuation..................................................................................23

4.8 Final Leak Testing....................................................................... 23

4.9 Control Wiring.............................................................................24

4.10 Typical Control Wiring Connections..........................................24

4.11 Power Wiring.............................................................................25

4.12 Grounding.................................................................................25

5.0 System Start-Up and Refrigerant Charging................. 26

5.1 System Start-Up Overview..........................................................26

5.2 Initial System Power Up............................................................. 26

5.3 Verify Indoor Air-Flow..................................................................

5.4 Refrigerant Charging..................................................................27

5.4.1 Measurement Device Set-Up................................................27

5.4.2 Preliminary Charging by Weight............................................ 27

5.4.3 Preliminary Charging by Pressures.......................................28

5.4.4 Final Charging by Liquid Subcooling.....................................28

5.4.5 R-410A Temperature Pressure Chart.................................... 29

5.5 Completing Installation...............................................................29

6.0 Sequence of Operation.................................................. 29

7.0 Components & Controls................................................ 30

7.1 Compressor................................................................................ 30

7.2 Fan Motor................................................................................... 30

7.3 Outdoor Fan............................................................................... 30

7.4 Compressor Contactor............................................................... 30

7.5 Compressor/Fan Motor Capacitor..............................................30

7.6 Compressor Crankcase Heater.................................................. 30

7.7 High and Low Pressure Control ................................................31

7.8 Compressor Hand Start Components ...................................... 31

8.0 Accessories.....................................................................32

8.1 Compressor Time ......................................................................32

8.2 High Pressure Control.................................................................32

8.3 Low Pressure Control ................................................................32

8.4 Low Ambient Control ................................................................ 32

8.5 Compressor Hard Start Kit ........................................................32

8.6 Compressor Crankcase Heater .................................................32

8.7 Compressor Sound Enclosure.......................................................

9.0 Diagnostics and Troubleshooting................................ 33

9.1 Cooling Mechanical Checks Flowchart.....................................................

9.2 General Troubleshooting Guide................................................. 34

9.3 Service Analyzer Charts............................................................. 35

9.4 Troubleshooting Tips .................................................................40

10. Outdoor Unit Maintenance............................................ 41

10.1 Outdoor Coil Cleaning..............................................................41

10.2 Cabinet Cleaning and Care......................................................41

10.3 Motor Lubrication.....................................................................41

10.4 Replacement Parts...................................................................41

11.0 Wiring Diagram............................................................ 42

1.0 IMPORTANT SAFETY INFORMATION

WARNINGS:

• These instructions are intended as an aid to

qualified, licensed service personnel for proper installation, adjustment, and operation of this unit. Read these instructions thoroughly before

attempting installation or operation. Failure to follow these instructions may result in improper installation, adjustment, service, or maintenance possibly resulting in fire, electrical shock, property damage, personal injury, or death.

• The unit must be permanently grounded. Failure to do so can cause electrical shock resulting in severe personal injury or death.

• Turn off electric power at the fuse box or service panel before making any electrical connections.

• Complete the ground connection before making line voltage connections. Failure to do so can result in electrical shock, severe personal injury, or death.

• Disconnect all power to unit before starting maintenance. Failure to do so can cause electrical shock resulting in severe personal injury or death.

• Never assume the unit is properly wired and/or grounded. Always test the unit cabinet with a noncontact voltage detector available at most electrical supply houses or home centers before removing access panels or coming into contact with the unit cabinet.

• Do not use oxygen to purge lines or pressurize system for leak test. Oxygen reacts violently with oil, which can cause an explosion resulting in severe personal injury or death.

• The top of the scroll compressor shell is hot.

Touching the compressor top may result in serious

personal injury.

• The manufacturer’s warranty does not cover any damage or defect to the unit caused by the attachment or use of any components, accessories, or devices (other than those authorized by the manufacturer) into, onto, or in conjunction with

the heat pump. You should be aware that the use of unauthorized components, accessories, or devices may adversely affect the operation of the heat pump and may also endanger life and property. The manufacturer disclaims any

responsibility for such loss or injury resulting from the use of such unauthorized components, accessories, or devices.

CAUTIONS:

• R-410A systems operate at approximately 60%

higher pressures (1.6 times) than R-22 systems. Do

not use R-22 service equipment or components on R-410A equipment. Use appropriate care when using

this refrigerant. Failure to exercise care may result in

equipment damage or personal injury.

• Only match this outdoor unit with a matched indoor

coil or air handler approved for use with this outdoor

unit per the unit manufacturer’s specification sheet. The use of unmatched coils or air handler will likely result in a charge imbalance between the cooling

and heating modes which can cause unsatisfactory operation including a high-pressure switch lockout condition.

• Only use indoor coils approved for use on R-410A

systems. An R-22 coil will have a TXV or fixed

restrictor device that is not designed to operate

properly in an R-410A system and will result in serious operational issues. The R-22 coil could also contain mineral oil which is incompatible with the POE oil used in R-410A systems and could result in reliability issues with the compressor and TXVs.

• When coil is installed over a finished ceiling and/or

living area, it is required that a secondary sheet metal condensate pan be constructed and installed under

the entire unit. Failure to do so can result in property damage.

• The compressor has an internal overload protector.

Under some conditions, it can take up to 2 hours for

this overload to reset. Make sure overload has had

time to reset before condemning the compressor.

WARNING:

Single-pole contactors are used on all standard single-phase units through 5 tons. Caution must be exercised when servicing as only one leg of the power supply is broken by the contactor.

Safety

2.0 GENERAL INFORMATION

WARNING:

Improper installation, or installation not made in accordance with these instructions, can result in unsatisfactory operation and/or dangerous conditions and can cause the related warranty not to apply.

2.1 Introduction

The information contained in this manual has been prepared to assist in the proper installation, operation, and maintenance of the air conditioning

system. Read this manual and any instructions packaged

with separate equipment required to make up the

system prior to installation. Homeowner should retain this manual for future reference.

2.2 Importance of

General Information

Quality Installation

A quality installation is critical to assure safety, reliability, comfort, and customer satisfaction. Strict adherence to applicable codes, the information in this installation manual, the outdoor unit installation manual, and the thermostat installation manual are key to a quality installation. Read the entire instruction manuals before starting

the installation.

IMPORTANT: This product has been designed and

manufactured to meet certified AHRI capacity and efficiency ratings with the appropriate outdoor

units. However, proper refrigerant charge, proper airflow, and refrigerant line sizing are critical to

achieve optimum capacity and efficiency and

to assure reliable operation. Installation of this product should follow the manufacturer’s

refrigerant charging and airflow instructions located in this installation manual and the charging

chart label affixed to the outdoor unit. Failure to

confirm proper charge and airflow may reduce

energy efficiency and shorten equipment life.

The equipment has been evaluated in accordance with the Code of Federal Regulations, Chapter XX, Part 3280.

Install the unit in accordance with applicable national, state, and local codes. Latest editions are available from: “National Fire Protection Association, Inc., Batterymarch Park, Quincy, MA

02269.” These publications are:

• NFPA90A Installation of Air Conditioning and

Ventilating Systems.

• NFPA90B Installation of warm air heating and air

conditioning systems.

Install the indoor unit in such a way as to allow

necessary access to the coil/filter rack and blower/

control compartment.

2.3 System Sizing and Selection

Before specifying any air-conditioning equipment,

a survey of the structure and heat gain calculation

must be made. A heat gain calculation involves

identifying all surfaces and openings that gain

heat from the surrounding air and quantifying

that heat to determine the amount of heat that

needs to be removed. A heat gain calculation also calculates the extra heat load caused by sunlight and for humidity removal. These factors must be considered before selecting an air-conditioning system to provide year-round comfort. The Air

Conditioning Contractors of America (ACCA) Manual J method of load calculation is one recognized procedure for determining the cooling load.

After the proper equipment combination has been selected, satisfying both sensible and latent requirements, the system must be properly

installed. Only then can the system provide the comfort it was designed to provide.

There are several factors that installers must

consider.

• Outdoor unit location

• Indoor unit blower speed and airflow

• Proper equipment evacuation

• Supply and return air duct design and sizing

• Refrigerant charge

• System air balancing

• Diffuser and return air grille location and sizing

IMPORTANT: Excessive use of

elbows in the refrigerant line set can produce

excessive pressure drop. Follow industry

best practices for installation. Installation and commissioning of this equipment is to be performed by trained and qualified HVAC professionals. For technical assistance, contact your Distributor Service Coordinator.

• ANSI/NFPA No. 70-(Latest Edition) National

Electrical Code.

2.0 GENERAL INFORMATION

2.4 Importance of Proper Indoor/Outdoor Match-Ups

To assure many years of reliable operation and

optimum customer comfort and to assure the

outdoor unit warranty remains valid, an air-handler model or indoor coil/furnace combination should be selected that is properly matched to the outdoor unit. The recommended approach is to

select an air-handler or indoor coil and gas furnace that has an AHRI match with the outdoor unit. Refer to the AHRI directory at www.ahridirectory. org to confirm the air-handler and outdoor unit are

a certified combination in the AHRI Directory.

2.5 Checking Product Received

Upon receiving unit, inspect it for any shipping damage. Claims for damage, either apparent or concealed, should be filed immediately with the shipping company. Check model number, electrical characteristics, and accessories to determine if they are correct. Check system components (indoor coil, outdoor unit, air handler/furnace, etc.) to make sure

they are properly matched.

2.6 Efficiency Testing Notice

For purposes of verifying or testing efficiency ratings, the test procedure in Title 10 APPENDIX M to Subpart B of Part 430 (Uniform Test Method for Measuring the Energy Consumption of Central Air Conditioners and Heat Pumps) and the clarifying provisions provided in the AHRI Operations Manual 210/240 that were applicable at the date of manufacture should be used for test set up and performance

2.7 Compressor Break-In Notice

Prior to agency testing, the unit must be run for 20 hours at 115ºF [46.1ºC] outdoor ambient temperature with 80ºF [26.7ºC] dry bulb/75ºF [23.9ºC] wet bulb indoor ambient temperature to break the compressor in.

General Information

3.0 UNIT SPECIFICATIONS

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3.1 Model Number Nomenclature

Specifications

3.2 Available Models

DRAC16A18AJ1NA

DRAC16A24AJ1NA

DRAC16A30AJ1NA

DRAC16A36AJ1NA

DRAC16A42BJ1NA

DRAC16A48AJ1NA

DRAC16A60AJ1NA

3.0 UNIT SPECIFICATIONS

1-60-208/230 9.0/9.0 46 0.5 12/12 15/15 20/20 11.82 [1.10] 1 2049 [967] 81 [2296] 150 [68.0] 157 [71.2]

1-60-208/230 11.2/11.2 60.8 0.36 15/15 20/20 25/25 13.72 [1.27] 1 2077 [980] 85 [2410] 164 [74.4] 171 [77.6]

1-60-208/230 12.8/12.8 64 0.68 17/17 20/20 25/25 16.39 [1.52] 1 2915 [1376] 112 [3175] 168 [76.2] 175 [79.4]

1-60-208/230 15.4/15.4 83.9 1.0 21/21 25/25 35/35 21.85 [2.03] 1 3431 [1619] 128 [3629] 194 [88.0] 201 [91.2]

1-60-208/230 16.7/16.7 109 1.3 23/23 30/30 35/35 18.30 [1.70] 1 3174 [1498] 135 [3827] 176 [79.8] 184 [83.5]

Minimum

Amperes

Maximum

Amperes

Fan Motor

Full Load

Amperes

(FLA)

Minimum

Circuit

Ampacity

Amperes

NOT ES: Factory Refrigerant Charge includes refrigerant for 15 ft. [4.6 m] of standard line set.

Model

Number

ELECTRICAL DATA

Refrig. Per

Circuit

Oz. [g]

Weight

Rated Load

Amperes

(RLA)

Locked

Rotor

Amperes

Face Area

Sq. Ft. [m

]

No. Rows CFM [L/s]

Net

Lbs. [kg]

Shipping

Lbs. [kg]

Fuse or HACR

Circuit Breaker

PHYSICAL DATA

Phase

Frequency (Hz)

Voltage (Volts)

Compressor

Outdoor Coil

1-60-208/230 18.6/18.6 109 1 25/25 30/30 40/40 21.85 [2.03] 1 3600 [1699] 164 [4649] 194 [88.0] 201 [91.2]

1-60-208/230 21.8/21.8 117 1.7 29/29 35/35 50/50 21.85 [2.03] 2 3615 [1706] 207 [5868] 262 [118.8] 269 [122.0]

1-60-208/230 26.4/26.4 134 1.7 35/35 45/45 60/60 21.85 [2.03] 2 3615 [1706] 228 [6464] 267 [121.1] 274 [124.3]

[-]16A18AJ

[-]16A24AJ

[-]16A30AJ

[-]16A36AJ

[-]16A42AJ

[-]16A42BJ

[-]16A48AJ

[-]16A60AJ

3.3 Electrical and Physical Data

Specifications

3.0 UNIT SPECIFICATIONS

SEE DETAIL A

LIQUID SERVICE FITTING

TRUE SUCTION SERVICE PORT

VAPOR SERVICE FITTING

3.3 Electrical and Physical Data (cont.)

FIGURE 1

DIMENSIONS

Specifications

AIR DISCHARGE: ALLOW

A-00008

60” [152.4 CM] MINIMUM CLEARANCE.

AIR INLETS

(LOUVERED PANELS) ALLOW 6” [15.2 CM] MINIMUM CLEARANCE

SERVICE ACCESS

ALLOW 24” [61.0 cm]

CLEARANCE

NOTE: GRILLE APPEARANCE MAY VA RY.

DIMENSIONAL DATA

16 SEER

Height “H” (in.) [cm]

Length “L” (in.) [cm]

Width “W” (in.) [cm]

*NOTE: “H” dimension includes basepan.

18, 24

241⁄4 [61.6]

275⁄8 [70.2]

42A

321⁄4 [81.9]

275⁄8 [70.2]

273/8 [69.5]

315⁄8 [80.3]

36,42B,48,60

353/8 [89.9]

315⁄8 [80.3]

4.1 Tools and Refrigerant

Ambient and Tube

Thermometers

Manifold

Gauge

Set

Brazing

Rods

Torch Nitrogen

Reclaimer

Recovery Cylinders

Allen Wrench

Crescent Wrench

4.0 INSTALLATION

4.1.1 Tools Required for Installing and Servicing R-410A Models

Manifold Sets: – Up to 800 PSIG [5,516 kPa] High-Side

– Up to 250 PSIG [1,724 kPa] Low-Side – 550 PSIG [3,792 kPa] Low-Side Retard Manifold Hoses:

– Service Pressure Rating of 800 PSIG [5,516 kPa] Recovery Cylinders: – 400 PSIG [2,758 kPa] Pressure Rating

– Dept. of Transportation 4BA400 or BW400

CAUTION: R-410A systems operate

at higher pressures than R-22 systems. Do not

use R-22 service equipment or components on R-410A equipment.

4.1.2 Specifications of R-410A

Application: R-410A is not a drop-in replacement for R-22. Equipment designs must

accommodate its higher pressures. It cannot be

retrofitted into R-22 heat pumps.

Physical Properties: R-410A has an atmospheric boiling point of -62.9°F [-52.7°C] and its saturation pressure at 77°F [25°C] is 224.5 psig [1,548 kPa].

Composition: R-410A is a near-azeotropic mixture of 50% by weight difluoromethane (HFC-32) and 50% by weight pentafluoroethane

(HFC-125).

Pressure: The pressure of R-410A is approximately 60% (1.6 times) greater than R-22. Recovery and recycle equipment, pumps,

hoses, and the like must have design pressure ratings appropriate for R-410A. Manifold sets need

to range up to 800 psig [5,516 kPa] high-side and 250 psig [1,724 kPa] low-side with a 550 psig [3,792 kPa] low-side retard. Hoses need to have a service pressure rating of 800 psig [5,516 kPa]. Recovery cylinders need to have a 400 psig [2,758 kPa] service pressure rating, DOT 4BA400 or DOT BW400.

Combustibility: At pressures above 1 atmosphere, a mixture of R-410A and air can become combustible. R-410A and air should

never be mixed in tanks or supply lines or be allowed to accumulate in storage tanks. Leak checking should never be done with a mixture of R-410A and air. Leak-checking can

be performed safely with nitrogen or a mixture of R-410A and nitrogen.

4.1.3 Quick-Reference Guide for R-410A

• R-410A refrigerant operates at approximately 60% higher pressure (1.6 times) than R-22. Ensure that servicing equipment is designed to operate with R-410A.

• R-410A refrigerant cylinders are light rose in

color.

• R-410A, as with other HFCs, is only compatible

with POE oils.

• Vacuum pumps will not remove moisture from POE oil used in R-410A systems.

• R-410A systems are to be charged with liquid refrigerants. Prior to March 1999, R-410A refrigerant cylinders had a dip tube. These cylinders should be kept upright for equipment

charging. Post-March 1999 cylinders do not

have a dip tube and should be inverted to ensure liquid charging of the equipment.

• Do not install a suction line filter drier in the liquid line.

• A factory-approved liquid line filter drier is shipped with every unit and must be installed in the liquid line at the time of installation. Only manufacturer-approved liquid line filter driers should be used. FIlter driers must be rated for a working pressure of at least 600 psig [4,137 kPa]. The filter drier will only have adequate

moisture-holding capacity if the system is properly evacuated.

• Desiccant (drying agent) must be compatible for POE oils and R-410A refrigerant.

Tools

12” Min. (30.5 cm) 24”

[61.0 CM]

RECOMMENDED

SERVICE PANELS/

INLET CONNECTIONS

/ HIGH & LOW

VOLTAGE ACCESS

ALLOW 24” [ 61.0 cm] OF

CLEARANCE

ALLOW 60” [152.4 cm]

OF CLEARANCE

AIR INLET LOUVERS ALLOW

6” [15.2 cm] Min. OF

CLEARANCE ALL SIDES

12” [30.5 cm] RECOMMENDED

ST-A1226-177-00

4.0 INSTALLATION

4.2 Choosing a Location

4.2.1 Allowable Clearances

12" [30.5 cm] to side intake louvers 24" [61.0 cm] to service access panels 60" [152.4 cm] vertical for fan discharge

If space limitations exist, the following clearances

will have minimal impact to capacity and efficiency

and are permitted: Single-Unit Applications: Minimum of 6" [15.2

cm] to side intake louvers. Do not reduce the 60" [152.4 cm] for fan discharge or the 24" [61.0 cm]

service clearances. Multiple-Unit Applications: For units positioned

next to each other, a minimum of 6" [15.2 cm] clearance between units is recommended for 1.5 and 2 ton models and 9" [22.9 cm] for 2.5 ton to 5 ton models. Do not reduce the 60" [152.4 cm] for fan discharge or the 24" [61.0 cm] service

clearances.

IMPORTANT: Consult local and

national building codes and ordinances for special installation requirements. Following location

information will provide longer life and simplified servicing of the outdoor unit.

Location

NOTICE: These units must be installed

outdoors. No ductwork can be attached, or other modifications made, to the discharge grille.

Modifications will affect performance or operation.

4.2.2 Operational Issues Related to Unit Location

IMPORTANT: Locate the unit

in a manner that will not prevent, impair, or compromise the performance of other equipment

installed in proximity to the unit. Maintain all

required minimum distances to gas and electric meters, dryer vents, and exhaust and inlet openings. In the absence of national codes or manufacturers’ recommendations, local code recommendations and requirements will take

precedence.

• Refrigerant piping and wiring should be properly sized and kept as short as possible to avoid

capacity losses and increased operating costs.

• Locate the unit where water runoff will not create a problem with the equipment. Position the unit

away from the drip edge of the roof whenever

possible. Units are weatherized, but can be affected by the following:

• Water pouring into the unit from the junction of rooflines, without protective guttering. Large

volumes of water entering the unit while in

operation can impact fan blade or motor life.

• Closely follow the clearance recommendations in

section 4.2.1.

• 24" [61.0 cm] to the service panel access

• 60" [152.4 cm] above fan discharge (unit top)

to prevent recirculation

• 6" [15.2 cm] to coil grille air inlets with 12" [30.5 cm] minimum recommended

4.2 Choosing a Location (cont.)

4.0 INSTALLATION

4.2.3 Corrosive Environment

The metal parts of this unit may be subject to rust or

deterioration if exposed to a corrosive environment.

This oxidation could shorten the equipment’s useful

life.

Corrosive elements include, but are not limited to, salt spray, fog or mist in seacoast areas, sulphur or chlorine from lawn watering systems, and various

chemical contaminants from industries such as paper mills and petroleum refineries.

If the unit is to be installed in an area where contaminants are likely to be a problem, special attention should be given to the equipment location

and exposure.

• Avoid having lawn sprinkler heads spray directly on the unit cabinet.

• In coastal areas, locate the unit on the side of the building away from the waterfront.

• Shielding provided by a fence or shrubs may give some protection, but cannot violate minimum

airflow and service access clearances.

WARNING: Disconnect all power to

unit before starting maintenance. Failure to do so can

cause electrical shock resulting in severe personal injury or death.

Regular maintenance will reduce the buildup of contaminants and help to protect the unit’s finish.

• Frequent washing of the cabinet, fan blade, and

coil with fresh water will remove most of the salt or

other contaminants that build up on the unit.

• A good liquid cleaner may be used several times

a year to remove matter that will not wash off with water.

4.2.4 Customer Satisfaction Issues

• The outdoor unit should be located away from the living, sleeping, and recreational spaces of the

owner and those spaces on adjoining property.

• To prevent noise transmission, the mounting pad for the outdoor unit should not be connected to the structure and should be located a sufficient distance above grade to prevent ground water from

entering the unit.

Location Mounting

4.3 Mounting Unit

4.3.1 Unit Mounting Methods

The outdoor unit may be mounted in a number of ways. The most common method is on a ground mounted concrete or pre-fabricated pad. It can also be mounted on a ground or roof mounted metal frame, wooden frame, or 4” x 4” [10.2 cm x 10.2 cm] wooden

stringers. It is extremely important to properly secure the unit to the pad or frame so it does not shift during

high winds, seismic events, or other outside forces to eliminate the possibility of a safety hazard or physical damage to the unit. Local codes in regions subject to frequent hurricanes and seismic events will dictate specific mounting requirements and must be followed.

4.3.2 High Wind and Seismic Tie-Down Methods

The manufacturer-approved/recommended method is a guide to securing equipment for wind and seismic loads. Other methods might provide the same result, but the manufacturer method is the only one endorsed by the manufacturer for securing equipment where wind or earthquake damage can occur. Additional information is available on the manufacturer's website or from the wholesale distributor.

4.0 INSTALLATION

ST-A1226-178-00

BASE PAD

(CONCRETE OR OTHER

SUITABLE MATERIAL)

DO NOT BLOCK

OPENINGS

IN BASE PAN

4.3.3 Elevating Unit

WARNING:

elevating stand in order to prevent tipping. Failure to do so may result in severe personal injury or death.

If elevating the unit, either on a flat roof or on a slab, observe the

following guidelines.

• If elevating a unit on a flat roof, use 4" x 4" [10.2 cm x 10.2 cm] or equivalent stringers positioned to distribute unit weight evenly and prevent noise and vibration.

Secure an elevated unit and its

NOTICE: Do not block drain openings on bottom of

unit.

Mounting

4.4 Refrigerant Line Set Selection

4.4.1 Replacing Existing Systems

To prevent failure of a new unit, the existing line set must be correctly sized for the new unit and must be cleaned or replaced. Care must be taken so

the expansion device is not plugged. For new and

replacement units, a liquid line filter drier must be installed and the line set must be properly sized. Test the oil for acid. If it tests positive for acid, a

suction line filter drier is mandatory.

4.4.2 Line Set Length and Fitting Losses

IMPORTANT: When replacing an

R-22 unit with an R-410A unit, either replace

the line set or ensure that residual mineral oil is drained from existing lines including oil trapped in low spots.

4.0 INSTALLATION

Refrigerant tubing is measured in terms of actual length and equivalent length. Actual length is used for refrigerant charge applications. Equivalent

length takes into account pressure losses from

Table 1

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tubing length, ttings, vertical separation, accessories, and lter driers. The table below references commonly used equivalent lengths.

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4.4.3 Liquid Line Selection

The purpose of the liquid line is to transport warm sub-cooled liquid refrigerant between the outdoor

unit to the indoor unit. It is important not to allow

the refrigerant to ash into superheated vapor prior to the expansion device of the indoor coil. The ashing of refrigerant can occur for the following reasons:

• Low refrigerant charge

• Improperly selected liquid line size

• Absorption of heat prior to expansion device

• Excessive vertical separation between the out-

door unit and indoor coil

• Restricted liquid line or lter drier

• Kinked liquid line

The total pressure drop allowed for the liquid line is 50 PSI [345 kPa]. The procedure for selecting the proper liquid line is as follows:

• Measure the total amount of vertical separation between the outdoor unit and indoor coil.

• Measure the linear length of liquid line needed.

• Add all of the equivalent lengths associated with any ttings or accessories using Table 1 above.

• Add the linear length to the total tting equivalent length. This will equal your total equivalent

line length.

• Reference Table 2 to verify the calculated equivalent length is acceptable with the required vertical separation and diameter of liquid line.

Tubing

4.0 INSTALLATION

1/4" 5/8" n/a 25 / 1.00 50 / 0.99 62 / 0.98 43 / 0.98 24 / 0.97 5 / 0.97

NR NR NR NR

1/4" 3/4" ** n/a 25 / 1.00 50 / 1.00 62 / 0.99 43 / 0. 99 24 / 0.99 5 / 0.99 NR NR NR NR

1/4" 5/8" n/a 25 / 0.99 50 / 0.98 21 / 0.97 N R NR NR NR NR NR NR

1/4" 3/4" n/a 25 /1.00 50 / 1.00 21 / 0.99 N R NR NR NR NR NR NR

6) Applicaons s haded in dark gray are not recommended due to excessive liquid or sucon pressure drop.

16 SEER Single-Stage Air-Condioners

4.4 Refrigerant Line Set Selection (cont.)

Table 2A: Refrigerant Line Sizing Chart (English Units)

Apply Long Line

Unit Size

Notes:

1) Do not exceed 200  linear line l ength.

2) * Do not exceed 180  vercal separaon if outdoor unit is above indoor unit.

3) ** 3/4" suc on line should only be used for 1.5 ton systems if outdoor unit is below or at same level as indoor to assure proper oil return.

4) Always use

5) Applicaons s haded in light gray indicate capacity mulpliers between 0.90 and 0.96 which are not recommended, but are allowed.

Allowable

Liquid Line

1.5 Ton

** SEE

NOTE 3

2 Ton

2.5 Ton

3 Ton

3.5 Ton

4 Ton

5 Ton

the smallest liquid line all owable to minimize refrigerant charge.

Allowable

Sucon Line

Size

5/16" 5/8" 190 25 / 1.00 50 / 0.99 75 / 0.98 98 / 0.98 93 / 0.97 88 / 0.97 83 / 0.96 78 / 0.96 73 / 0.95 68 / 0.94

3/8" 5/8" 127 25 / 1.00 50 / 0.99 75 / 0. 98 100 / 0.98 100 / 0.97 100 / 0.97 100 / 0. 96 100 / 0.96 100 / 0.95 100 / 0.94

5/16" 3/4" ** 190 25 / 1.00 50 / 1.00 75 / 0.99 98 / 0.99 93 / 0.99 88 / 0.99 83 / 0.99 78 / 0.98 73 / 0.98 68 / 0.98

3/8" 3/4" ** 127 25 / 1.00 50 / 1.00 75 / 1.00 100 / 0.99 100 / 0.99 100 / 0.99 100 / 0.99 100 / 0.98 100 / 0.98 100 / 0.98

5/16" 5/8" 180 25 / 0.99 50 / 0.98 75 / 0.97 87 / 0.96 77 / 0.95 69 / 0.94 61 / 0.93 53 / 0.92 45 / 0.91 37 / 0.90

3/8" 5/8" 120 25 / 0.99 50 / 0.98 75 / 0. 97 100 / 0.96 100 / 0.95 100 / 0.94 98 / 0.93 95 / 0.92 92 / 0.91 89 / 0.90

5/16" 3/4" 180 25 /1.00 50 / 1.00 75 / 0.99 87 / 0.99 77 / 0.98 69 / 0.98 61 / 0.98 53 / 0.97 45 / 0.97 37 / 0.96

3/8" 3/4" 120 25 / 1.00 50 / 1.00 75 / 0. 99 100 / 0.99 100 / 0.98 100 / 0.98 98 / 0.98 95 / 0.97 93 / 0.97 90 / 0.96

5/16" 5/8" 113 25 / 0.99 50 / 0.98 75 / 0.96 70 / 0.94 59 / 0.93 48 / 0.91 36 / 0.90 NR NR NR

3/8" 5/8" 75 25 / 0.99 50 / 0.98 75 / 0.96 100 / 0.94 98 / 0.93 94 / 0.91 90 / 0.90 NR NR NR

5/16" 3/4" 113 25 / 1.00 50 / 0.99 75 /

3/8" 3/4" 75 25 / 1.00 50 / 0.99 75 / 0.99 100 / 0.98 98 / 0.98 94 / 0.97 90 / 0.96 86 / 0.96 82 / 0.95 78 / 0.95

5/16" 5/8" 73 25 / 0.99 50 / 0.97 66 / 0.94 49 / 0.92 32 / 0.90 NR NR NR NR NR

3/8" 5/8" 48 25 / 0.99 50 / 0.97 75 / 0.94 95 / 0. 92 89 / 0.90 NR NR NR NR NR

5/16" 3/4" 73 25 / 1.00 50 / 0.99 66 / 0.98 49 / 0.98 32 / 0.97 15 / 0.96 NR NR NR NR

3/8" 3/4" 48 25 / 1.00 50 / 0.99 75 / 0 1/2" 3/4" 24 25 / 1.00 50 / 0.99 75 / 0.98 100 / 0.98 100 / 0.97 100 / 0.96 100 / 0.95 100 / 0.94 100 / 0.93 100 / 0.93

5/16" 7/8" 73 25 / 1.00 50 / 1.00 66 / 1.00 49 / 0.99 32 / 0.99 15 / 0.99 NR NR NR NR

3/8" 7/8" 48 25 / 1.00 50 / 1.00 75 / 1.00 95 / 0. 99 89 / 0.99 84 / 0.99 78 / 0.98 72 / 0.98 67 / 0.98 61 / 0.97 1/2" 7/8" 24 25 / 1.00 50 / 1.00 75 / 1.00 100 / 0.99 100 / 0 3/8" 3/4" 100 25 / 0.99 50 / 0.98 75 / 0. 97 88 / 0.96 80 / 0.95 72 / 0.94 65 / 0.92 57 / 0.91 49 / 0.90 NR 1/2" 3/4" 50 25 / 0.99 50 / 0.98 75 / 0.97 100 / 0.96 100 / 0.95 100 / 0.94 100 / 0.92 100 / 0.91 100 / 0.90 NR 3/8" 7/8" 100 25 / 1.00 50 / 1.00 75 / 0. 99 88 / 0.99 80 / 0.99 72 / 0.98 65 / 0.97 57 / 0.97 49 / 0.96 42 / 0.96 1/2" 7/8" 50 25 / 1.00 50 / 1.00 75 / 0.99 100 / 0.99 100 / 3/8" 3/4" 0 25 / 0.99 50 / 0.98 75 / 0.96 77 / 0.95 67 / 0.93 57 / 0.92 46 / 0.91 NR NR NR 1/2" 3/4" 0 25 / 0.99 50 / 0.98 75 / 0.96 100 / 0.95 100 / 0. 93 100 / 0.92 100 / 0.91 NR NR NR 3/8" 7/8" 0 25 / 1.00 50 / 0.99 75 / 0.99 77 / 0.98 67 / 0.97 57 / 0.97 46 / 0.96 36 / 0.96 26 / 0.95 15 / 0.95 1/2" 7/8" 0 25 / 1.00 50 / 0.99 75 / 0.99 100 / 0.98 100 / 0. 97 100 / 0.97 100 / 0.96 100 / 0.96 9 3/8" 3/4" 0 25 / 0.99 50 / 0.97 75 / 0.94 61 / 0.92 46 / 0.90 NR NR NR NR N R 1/2" 3/4" 0 25 / 0.99 50 / 0.97 75 / 0.94 100 / 0.92 100 / 0. 90 NR NR NR NR NR 3/8" 7/8" 0 25 / 1.00 50 / 0.99 75 / 0.98 61 / 0.97 46 / 0.96 32 / 0.95 18 / 0.94 NR NR NR 1/2" 7/8" 0 25 / 1.00 50 / 0.99 75 / 0.98 100 / 0.97 100 /0.96 100 / 0. 95 97 / 0.94 95 / 0.94 92 / 0.93 89 / 0.92 3/8" 1-1/8" 0 25 / 1.01 50 / 1.01 75 / 1.00 61 / 1.00 46 / 0.99 32 / 0.99 18 / 0. 1/2" 1-1/8" 0 25 / 1.01 50 / 1.01 75 / 1.00 100 /1.00 100 / 0.99 100 / 0.99 97 / 0.99 95 / 0.99 92 / 0.99 89 / 0.98

Size

Guideli nes if

Linear Line Length

Exceeds Those

Shown Below

(Feet)

< 25 26-50 51-75 76- 100 101-125 126-150 151-175 176-200 201-225 226-250

Maximum Vercal Rise (Outdoor Unit Below Indoor Unit) * / Capacity Mulplier

0.99 70 / 0.98 59 / 0.98 48 / 0.97 36 / 0.96 25 / 0.96 13 / 0.95 NR

.98 95 / 0.98 89 / 0.97 84 / 0.96 78 / 0.95 72 / 0.94 67 / 0.93 61 / 0.93

Equivalent Length (Feet)

.99 100 / 0.99 100 / 0.98 100 / 0.98 100 / 0.98 100 / 0.97

0.99 100 / 0.98 100 / 0.97 100 / 0.97 100 / 0.96 100 / 0.96

9 / 0.95 97 / 0.95

99 NR NR NR

Tubing

4.0 INSTALLATION

6.35 [1/4] 15.88 [5/8] n/a 8 / 1.00 15 / 0.99 19 / 0.98 13 / 0.98 7 / 0.97 2 / 0.97 NR NR NR NR

6.35 [1/4] 19.05 [3/4] ** n/a 8 / 1.00 15 / 1.00 19 / 0.99 13 / 0.99 7 / 0.99 2 / 0.99 NR N R NR NR

6.35 [1/4] 15.88 [5/8] n/a 8 / 0.99 15 / 0.98 6 / 0.97 NR NR NR NR NR N R NR

6.35 [1/4] 19.05 [3/4] n/ a 8 / 1.00 15 / 1.00 6 / 0.99 N R NR NR NR NR NR NR

6) Applicaons s haded in dark gray are not recommended due to excessi ve liquid or sucon pressure drop.

16 SEER Single-Stage Air-Condioners

< 25 26- 50 51-75 76- 100 101-125 126- 150 151-175 176-200 201- 225226-250

5/16"5/8"7325 / 0.99 50 / 0.97 66 / 0.94 49 / 0.92 32 / 0.90 NR NR NR NR NR

3/8" 5/8" 48 25 / 0.99 50 / 0.97 75 / 0.94 95 / 0.92 89 / 0.90 NR NR NR NR NR

5/16"3/4"7325 / 1.00 50 / 0.99 66 / 0.98 49 / 0.98 32 / 0.97 15 / 0.96 NR NR NR NR

3/8" 3/4" 48 25 / 1.00 50 / 0.99 75 / 0.98 95 / 0.98 89 / 0.97 84 / 0.96 78 / 0.95 72 / 0.94 67 / 0.93 61 / 0.93 1/2" 3/4" 24 25 / 1.00 50 / 0.99 75 / 0.98 100 / 0.98 100 / 0.97 100 / 0.96 100 / 0.95 100 / 0.94 100 / 0.93 100 / 0.93

5/16"7/8"7325 / 1.00 50 / 1.00 66 / 1.00 49 / 0.99 32 / 0.99 15 / 0.99 NR NR NR NR

3/8" 7/8" 48 25 / 1.00 50 / 1.00 75 / 1.00 95 / 0.99 89 / 0.99 84 / 0.99 78 / 0.98 72 / 0.98 67 / 0.98 61 / 0.97 1/2" 7/8" 24 25 / 1.00 50 / 1.00 75 / 1.00 100 / 0.99 100 / 0.99 100 / 0.99 100 / 0.98 100 / 0.98 100 / 0.98 100 / 0.97

Excerp t from Table 3A

Apply Long Line

Guidelines if

Linear Line Length

Exceeds Those

Shown Below

(Feet)

Equivelent Length (Feet)

Maximum Vercal Rise (Outdoor Unit Below Indoor Unit) * / Capaci ty Mulplier

3 Ton

Unit Size

Allowable

Liquid Line

Size

Allowable

Sucon Line

Size

4.5 Refrigerant Line Set Selection (cont.)

Table 2B: Refrigerant Line Sizing Chart (Metric Units)

Apply Long Line

Allowable Liquid Line

Unit Size

5.3 KW

7.94 [5/16] 15.88 [5/8] 58 8 / 1.00 15 / 0.99 23 / 0.98 30 / 0.98 28 / 0.97 27 / 0.97 25 / 0.96 24 / 0. 96 22 / 0.95 21 / 0.94

[1.5 Ton]

** SEE

7.94 [5/16] 19.05 [3/4] ** 58 8 / 1.00 15 / 1.00 23 / 0.99 30 / 0. 99 28 / 0.99 27 / 0.99 25 / 0.99 24 / 0.98 22 / 0. 98 21 / 0.98

NOTE 3

7.94 [5/16] 15.88 [5/8] 55 8 / 0.99 15 / 0.98 23 / 0.97 27 / 0.96 23 / 0.95 21 / 0.94 19 / 0.93 16 / 0. 92 14 / 0.91 11 / 0.90

7.0 KW

[2 Ton]

7.94 [5/16] 19.05 [3/4] 55 8 / 1.00 15 / 1.00 23 / 0.99 27 / 0.99 23 / 0.98 21 / 0.98 19 / 0.98 16 / 0. 97 14 / 0.97 11 / 0.96

7.94 [5/16] 15.88 [5/8] 34 8 / 0.99 15 / 0.98 23 / 0.96 21 / 0.94 18 / 0.93 15 / 0.91 11 / 0.90 NR NR NR

8.8 KW

[2.5 Ton]

7.94 [5/16] 19.05 [3/4] 34 8 / 1.00 15 / 0.99 23 / 0.99 21 / 0.98 18 / 0.98 15 / 0.97 11 / 0.96 8 / 0.96 4 / 0.95 NR

7.94 [5/16] 15.88 [5/8] 22 8 / 0.99 15 / 0.97 20 / 0.94 15 / 0.92 10 / 0.90 NR NR NR NR NR

7.94 [5/16] 19.05 [3/4

10.6 KW [3 Ton]

7.94 [5/16] 22.23 [7/8] 22 8 / 1.00 15 / 1.00 20 / 1.00 15 / 0.99 10 / 0.99 5 / 0.99 NR NR NR NR

12.3 KW

[3.5 Ton]

14.1 KW [4 Ton]

17.6 KW [5 Ton]

Notes:

1) Do not

exceed 61 meters linear line length.

2) * Do not exceed 55 meters vercal s eparaon if outdoor unit is above indoor unit.

3) ** 19.05 mm [3/4 in.] vapor line should only be used for 1.5 ton systems if outdoor unit is below or at same level as indoor unit to assure proper oil return.

4) Always us e the smalles t liquid line allowable to minimize refri gerant charge.

5) Applicaons s haded in light gray

Allowable

Sucon Line

Size

mm [in.]

9.53 [3/8] 15.88 [5/8] 39 8 / 1.00 15 / 0.99 23 / 0.98 30 / 0.98 30 / 0.97 30 / 0.97 30 / 0.96 30 / 0.96 30 / 0. 95 30 / 0.94

9.53 [3/8] 19.05 [3/4] ** 39 8 / 1.00 15 / 1.00 23 / 0.99 30 / 0.99 30 / 0. 99 30 / 0.99 30 / 0.99 30 / 0.98 30 / 0.98 30 / 0.98

9.53 [3/8] 15.88 [5/8] 37 8 / 0.99 15 / 0.98 23 / 0.97 30 / 0.96 30 / 0.95 30 / 0.94 30 / 0.93 29 / 0.92 28 / 0. 91 27 / 0.90

9.53 [3/8] 19.05 [3/4] 37 8 / 1.00 15 / 1.00 23 / 0.99 30 / 0.99 30 / 0.98 30 / 0.98 30 / 0.98 29 / 0.97 28 / 0. 97 27 / 0.96

9.53 [3/8] 15.88 [5/8] 23 8 / 0.99 15 / 0.98 23 / 0.96 30 / 0.94 30 / 0.93 29 / 0.91 27 / 0.

9.53 [3/8] 19.05 [3/4] 23 8 / 1.00 15 / 0.99 23 / 0.99 30 / 0.98 30 / 0.98 29 / 0.97 27 / 0.96 26 / 0.96 25 / 0. 95 24 / 0.95

9.53 [3/8] 15.88 [5/8] 15 8 / 0.99 15 / 0.97 23 / 0.94 29 / 0.92 27 / 0.90 NR N R NR NR NR

9.53 [3/8] 19.05 [3/4] 15 8 / 1.00 15 / 0.99 23 / 0.98 29 / 0.98 27 / 0.97 26 / 0.96 24 / 0.95 22 / 0.94 20 / 0. 93 19 / 0.93

12.7 [1/2] 19.05 [3/4] 7 8 / 1.00 15 / 0.99 23 / 0.98 30 / 0.98 30 / 0. 97 30 / 0.96 30 / 0.95 30 / 0.94 30 / 0.93 30 / 0.93

9.53 [3/8] 22.23 [7/8] 15 8 / 1.0 1/2 [12. 7] 22.23 [7/8] 7 8 / 1.00 15 / 1.00 23 / 1. 00 30 / 0.99 30 / 0.99 30 / 0.99 30 / 0.98 30 / 0.98 30 / 0. 98 30 / 0.97

9.53 [3/8] 19.05 [3/4] 30 8 / 0.99 15 / 0.98 23 / 0.97 27 / 0.96 24 / 0.95 22 / 0.94 20 / 0.92 17 / 0.91 15 / 0. 90 NR

12.7 [1/2] 19.05 [3/4] 15 8 / 0.99 15 / 0.98 23 / 0.97 30 / 0.96 30 / 0.95 30 / 0.94 30 / 0.92 30 / 0.91 30 / 0. 9

9.53 [3/8] 22.23 [7/8] 30 8 / 1.00 15 / 1.00 23 / 0.99 27 / 0.99 24 / 0.99 22 / 0.98 20 / 0.97 17 / 0.97 15 / 0. 96 13 / 0.96

12.7 [1/2] 22.23 [7/8] 15 8 / 1.00 15 / 1.00 23 / 0.99 30 / 0.99 30 / 0.99 30 / 0.98 30 / 0.97 30 / 0.97 30 / 0. 96 30 / 0.96

9.53 [3/8] 19.05 [3/4] 0 8 / 0.99 15 / 0.98 23 / 0.96 24 / 0.95 20 / 0. 93 17 / 0.92 14 / 0.91 N R NR NR

12.7 [1/2] 19.05 [3/4] 0 8 / 0.99 15 / 0.98 23 / 0.96 30 / 0.95 30 / 0. 93 30 / 0.92 30 / 0.9

9.53 [3/8] 22.23 [7/8] 0 8 / 1.00 15 / 0.99 23 / 0.99 24 / 0.98 20 / 0. 97 17 / 0.97 14 / 0.96 11 / 0.96 8 / 0.95 5 / 0.95

12.7 [1/2] 22.23 [7/8] 0 8 / 1.00 15 / 0.99 23 / 0.99 30 / 0.98 30 / 0. 97 30 / 0.97 30 / 0.96 30 / 0.96 30 / 0.95 30 / 0.95

9.53 [3/8] 19.05 [3/4] 0 8 / 0.99 15 / 0.97 23 / 0.94 19 / 0.92 14 / 0. 90 NR NR NR NR NR

12.7 [1/2] 19.05 [3/4] 0 8 / 0.99 15 / 0.97 23 / 0.94 30 / 0.92 30 / 0. 90 NR NR NR NR NR

9.53 [3/8] 22.23 [7/8]

12.7 [1/2] 22.23 [7/8] 0 8 / 1.00 15 / 0.99 23 / 0.98 30 / 0.97 30 /0.96 30 / 0.95 30 / 0. 94 29 / 0.94 28 / 0.93 27 / 0.92

9.53 [3/8] 28.58 [1-1/8] 0 8 / 1.01 15 / 1.01 23 / 1.00 19 / 1.00 14 / 0.99 10 / 0.99 5 / 0.99 NR N R NR

12.7 [1/2] 28.58 [1-1/8] 0 8 / 1.01 15 / 1.01 23 / 1.00 30 / 1.00 30 / 0.99 30 / 0.99 30 / 0. 99 29 / 0.99 28 / 0.99 27 / 0.98

mm [in.]

Guideline s if

Linear Line

Length Exceeds

Size

Those Shown

Below

(Meters)

] 22 8 / 1.00 15 / 0.99 20 / 0.98 15 / 0. 98 10 / 0.97 5 / 0.96 NR NR NR NR

0 8 / 1.00 15 / 0.99 23 / 0.98 19 / 0.97 14 / 0.96 10 / 0.95 5 / 0.94 NR NR NR

indicate capacity mulpliers between 0.90 and 0.96 which are not recommended, but are allowed.

< 8 8-15 16-23 24-30 31-38 39-46 47-53 54-61 62-69 70-76

Maximum Vercal Rise (Outdoor Unit Below Indoor Unit) * / Capacity Mulplier

0 15 / 1.00 23 / 1.00 29 / 0.99 27 / 0.99 26 / 0.99 24 / 0.98 22 / 0.98 20 / 0.98 19 / 0. 97

Equivalent Length (Meters)

90 NR NR NR

1 NR NR NR

0 NR

Example: A 3 ton system is installed 50' below the indoor unit, requires a 75' of 1/2" diameter liquid line, 3/4" diameter suction line, and 4 90° LR elbows, and a lter drier.

• Fitting Equivalent Length (ft.) = (4 × .9') + 6' = 9.6'

• Total Equivalent Length (ft.) = 75' + 9.6' = 84.6'

This application is acceptable because the 50' vertical rise is less than the maximum rise of 100' for this application. The application is also considered

to have a long line set since 75 linear feet exceeds the limit of 24 feet. Reference the long line set sec-

tion of the I&O for detail.

Tubing

4.0 INSTALLATION

4.4 Refrigerant Line Set Selection (cont.)

4.4.4 Suction Line Selection

Purpose of the suction line is to return superheated vapor to the condensing unit from the evaporator.

Proper suction line sizing is important because

it plays an important role in returning oil to the compressor to prevent potential damage to the bearings, valves, and scroll sets. Also, an undersized suction line can dramatically reduce capacity

and performance of the system. The procedure for selecting the proper suction line is as follows:

• Determinate the total linear length of suction line required.

• Add all of the equivalent lengths associated with any ttings or accessories using the table on

previous page.

• Add the linear length and total tting equivalent length. This will equal your total equivalent

length.

• Reference Table 2 to verify that the calculated equivalent length falls within the acceptable

region of the chart.

• Verify the capacity dierence is compatible with the application using the multiplier in Table 2.

• Use only suction line sizes listed in Table 2.

4.4.5 Long Line Set

Considerations

Long line set applications are dened as applications that require accessories or alternate construction methods. The following things must be

considered when selecting and installing a long line

set:

• Additional refrigerant charge

• Fitting losses and maximum equivalent length

considerations

• Refrigerant migration during the o cycle

• Oil return to the compressor

• Capacity losses

• System oil level adjustment

4.4.5.1 Determining if Long Line

Set Length Requirements Apply

Table 2 is used to determine if the application is

considered to have a long line set. A column is provided that shows the linear line length where long

Tubing

line length requirements apply.

4.4.5.2 Oil Return to Compressor

Small amounts of compressor crankcase oil is

picked up and carried out of the compressor by

the moving refrigerant and is circulated through the

system along with the refrigerant before it returns

to the compressor crankcase. It is critical to the life

of the compressor for the oil to be able to return to the compressor to maintain an adequate level of

oil in the compressor crankcase. Oversized vapor

lines result in inadequate refrigerant velocities

to carry the oil along with the refrigerant and will cause the oil to accumulate in the low spots in the

vapor line instead of being returned to the compressor crankcase. This is especially true for long

line lengths. Only use the vapor line sizes listed in

Table 2 to assure proper oil return. Do not oversize

the vapor line.

4.4.5.3 Refrigerant Migration During Off Cycle

Long line set applications can require a considerable amount of additional refrigerant. This additional refrigerant needs to be managed throughout the entire ambient operating envelope that the system will go through during its life cycle. O-Cycle

migration is where excess refrigerant condenses and migrates to the coldest and/or lowest part of

the system. Excessive build-up of refrigerant at the compressor will result in poor reliability and noisy

operation during startup. Long line applications

require TXV's on both the indoor coil and outdoor unit and a crankcase heater. (See table below and

Section 7.6 for crankcase heater information.)

Factory

DRAC16

OD Model

[-]16A18AJ [-]16A24AJ [-]16A30AJ [-]16A36AJ [-]16A42AJ [-]16A42BJ [-]16A48AJ [-]16A60AJ

Installed

CCH

N N N N N N Y Y

4.0 INSTALLATION

4.4 Refrigerant Line Set Selection (cont.)

4.4.5.4 Maximum Liquid Pressure Drop

The total liquid line pressure drop must not exceed 50 psig [345 kPa] to assure a solid column of liquid at the metering device and stable control of superheat. Be sure to account for vertical separation, elbows, lter driers, solenoid valves, sight glasses, and check valves when calculating liquid line pressure drop.

4.4.5.5 Liquid Line Refrigerant Flashing

Excessive pressure drop and heat gain in long liquid lines can result in the refrigerant ashing into a vapor before it reaches the metering device which will dramatically reduce the capacity and eciency of the system. For this reason, the liquid line must be sized properly using the table in Table 2 and must be

insulated in unconditioned spaces.

4.4.5.6 Oil Level Adjustment for Long Line Set Applications

Additional oil may need to be added for long line set applications. (Ref. Table 2). If the system contains more than 20 lbs [9 kg] of refrigerant charge, add 1 oz of POE oil for every 5 lbs [13 ml/kg] of refrigerant charge over 20 lbs [9 kg].

4.4.5.7 Capacity Losses

Long line lengths can result in a reduction in capacity due to suction line pressure drop and heat gain. Refer

to Table 2 for capacity loss multipliers for various

vapor line diameters and lengths. Only use vapor lines

listed in Table 2 to assure proper oil return. This table

does not account for any capacity loss due to heat gain from the environment. It is extremely important not to oversize the suction line to minimize capacity

loss at the expense of proper oil return. If the table shows an “NR” for a particular vapor line diameter and length, capacity loss will be excessive. The full length of the suction line must be insulated to minimize heat

gain.

Tubing

TEMPORARY

HANGER

PERMANENT

HANGER

ST-A1226-179-00

4.0 INSTALLATION

4.5 Line Set Installation

• If tubing is to be run underground, it must be run in

a sealed watertight chase.

• Use care in routing tubing and do not kink or twist.

Use a good quality tubing bender on the vapor line

to prevent kinking.

• Route the tubing using temporary hangers; then

straighten the tubing and install permanent hangers. The tubing must be adequately supported.

• Isolate the vapor line from the building structure. If

the vapor line comes in contact with inside walls, ceiling, or flooring, the vibration of the vapor line

4.5.1 Important Tubing Installation Practices

Observe the following when installing correctly sized type “L” refrigerant tubing between the outdoor unit and indoor coil:

• Check the tables on Table 2 for the correct suction line size and liquid line size.

• If a portion of the liquid line passes through a

very hot area where liquid refrigerant can be heated to form vapor, insulating the liquid line is required.

• Use clean, dehydrated, sealed refrigeration-grade tubing.

• Always keep tubing sealed until tubing is in place and connections are to be made.

• A high-quality filter drier is included with all units and must be installed in the liquid line upon unit

installation.

• When replacing an R-22 system with an R-410A system and the line set is not replaced, blow out

Tubing

the lines with dry nitrogen to remove as much

of the remaining mineral oil as possible. Check for low spots where oil may be trapped and take

measures to drain the oil from those areas.

in the heating mode will result in noise inside the structure.

• Blow out the liquid and vapor lines with dry nitrogen before connecting to the outdoor unit and indoor coil to remove debris that can plug the

expansion device.

• If tubing has been cut, debur the ends while holding the tubing in a position to prevent chips from falling into tubing. Burrs such as those caused by tubing cutters can affect performance dramatically, particularly on small diameter liquid

lines.

• For best operation, keep tubing run as short as possible with a minimum number of elbows or bends.

• Locations where the tubing will be exposed to mechanical damage should be avoided. If it is necessary to use such locations, the copper tubing should be protected by a housing to

prevent damage.

OUTDOOR UNIT LEVEL OR NEAR LEVEL TO INDOOR SECTION LINE SET

4.0 INSTALLATION

4.5 Line Set Installation (cont.)

4.5.2 Relative Location of Indoor and Outdoor Units

4.5.2.1 Indoor and Outdoor Unit Near Same Level

REFERENCE TABLE 2 FOR

MAXIMUM LENGTH LIMITATION

IDEALLY, LINE SET SLOPES AWAY

FROM OUTDOOR. VERIFY

SUB-COOLING PRIOR TO

EXPANSION DEVICE, INSULATED

LIQUID LINE IN AN UNCONDITIONED SPACE

FOR LONG LINE APPLICATIONS. INSULATE

SUCTION LINE FULL LENGTH FOR ALL APPLICATIONS

For applications that are considered to have a long line set with the outdoor unit and indoor unit near

the same level the following is required:

• TXV on the indoor coil

• Start components may be required depending upon quality of voltage (consistently <200 vac at

outdoor unit)

•

Crankcase heater (Some models have factory

installed CCH's. Refer to tables in Section 4.4.5.6.)

• Insulated liquid line in unconditioned space only.

Insulated suction line full length.

• Suction line should slope toward the indoor unit

• Follow the proper line sizing, maximum linear and equivalent lengths, charging requirements,

and oil level adjustments spelled out in this manual.

• Verify at least 5°F [2.8°C] liquid sub-cooling at

the indoor unit prior to expansion device.

ST-A1219-50-00

Tubing

OUTDOOR UNIT BELOW INDOOR SECTION LINE SET

4.0 INSTALLATION

4.5 Line Set Installation (cont.)

4.5.2.2 Outdoor Unit Below Indoor Unit

INSULATE

LIQUID LINE IN

UNCONDITIONED

SPACE FOR LONG

LINE APPLICATIONS

ROUTE

REFRIGERANT LINES

EVEN WITH TOP OF

COIL OR INSTALL INVERTED TRAP.

INSULATE SUCTION

LINE FULL LENGTH

FOR ALL APPLICATIONS

REFERENCE TABLE 2 FOR

MAXIMUM LENGTH

LIMITATIONS

AND VERTICAL SEPARATION

Tubing

For applications that are considered to have a long

line set with the outdoor unit below the indoor unit the following is required:

• TXV or at the indoor coil.

• Crankcase heater (Some models have factory installed CCH's. Refer to tables in Section

4.4.5.6.)

• Start components may be required depending upon quality of voltage (consistently <200 vac at

outdoor unit)

• Refrigerant lines should be routed even with the top of the indoor coil or an inverted trap is to be

applied (refer to Figure 4).

Figure 4

ST-A1219-51-00

• Insulated liquid line in unconditioned space only.

Insulated suction line full length.

• Follow the proper line sizing, maximum linear and equivalent lengths, charging requirements,

and oil level adjustments spelled out in this manual.

• Verify at least 5°F [2.8°C] liquid sub-cooling at

the indoor unit prior to expansion device.

• Vertical separations greater that 25’ [7.62 m] can expect a lower sub-cooling level.

4.5 Line Set Installation (cont.)

4.5.2.3 Outdoor Unit Above Indoor Unit

INSULATE SUCTION

LINE FULL LENGTH

FOR ALL APPLICATIONS

INSULATE LIQUID LINE

IN UNCONDITIONED

SPACE FOR LONG

LINE APPLICATIONS

4.0 INSTALLATION

REFERENCE TABLE 2 FOR

MAXIMUM LENGTH

AND VERTICAL SEPARATION

LIMITATIONS

VERIFY

SUB-COOLING

PRIOR TO

METERING

DEVICE

For applications that are considered to have a long

line set with the outdoor unit above the indoor unit the following is required:

• TXV on the indoor coil.

• Crankcase heater (Some models have factory installed CCH's. Refer to tables in Section 4.4.5.6.)

• Start components maybe required depending upon quality of voltage (consistently <200 vac at

outdoor unit)

TXV AI INDOOR

COIL

• Insulated liquid line in unconditioned space only.

Insulated suction line full length.

• Follow the proper line sizing, maximum linear and equivalent lengths, charging requirements,

and oil level adjustments spelled out in this manual.

Tubing

4.0 INSTALLATION

4.5 Line Set Installation (cont.)

4.5.3 Tubing Connections

Indoor coils have only a holding charge of

dry nitrogen. Keep all tube ends sealed until connections are to be made.

• Use type “L” copper refrigeration tubing. Braze the connections with the following alloys:

– Copper to copper, 5% silver minimum – Copper to steel or brass, 15% silver minimum

• Be certain both refrigerant shutoff valves at the

outdoor unit are closed.

•

Wrap valves with a wet rag or thermal barrier compound before applying heat.

•

Braze the tubing between the outdoor unit and

indoor coil. Flow dry nitrogen into a pressure port

and through the tubing while brazing, but do not allow pressure inside tubing which can result in leaks. Once the system is full of nitrogen, the nitrogen regulator should be turned off to avoid

pressuring the system.

Tubing

•

Remove the caps and Schrader cores from the pressure ports to protect seals from heat damage. Both the Schrader valves and the service valves

have seals that may be damaged by excessive heat.

•

Clean the inside of the fittings and outside of the

tubing with a clean, dry cloth before soldering. Clean out debris, chips, dirt, etc., that enters tubing

or service valve connections.

• A

fter brazing, use an appropriate heatsink material

to cool the joint.

• Reinstall the Schrader cores into both pressure

ports.

• Do not allow the bare suction line and liquid line to be in contact with each other. This causes an undesirable heat transfer resulting in capacity

loss and increased power consumption.

4.0 INSTALLATION

4.6 Initial Leak Testing

Indoor coils have only a holding charge of dry

nitrogen. Keep all tube ends sealed until connections are to be made.

WARNING: Do not use oxygen

to purge lines or pressurize system for leak test.

Oxygen reacts violently with oil, which can cause

an explosion resulting in severe personal injury or death.

•

Pressurize line set and coil through service fittings

with dry nitrogen to a maximum of 150 PSIG [1034 kPa]. Close nitrogen tank valve, let system sit for at least 15 minutes, and check to see if the pressure has dropped. If the pressure has dropped, check for leaks at the line set braze joints with soap bubbles

and repair leak as necessary. Repeat pressure test.

If line set and coil hold pressure, proceed with line

set and coil evacuation (see Sections 4.7 and 4.8 for evacuation and final leak testing).

4.7 Evacuation

Evacuation is one of the most important parts of the

entire installation and service procedure. The life and efficiency of the equipment is dependent upon the thoroughness exercised by the serviceman when

evacuating air and moisture from the system. Air or nitrogen in the system increases condensing

temperature and pressure, resulting in increased power consumption, erratic operation, and reduced

capacity. Moisture chemically reacts with the refrigerant

and oil to form corrosive acid which attacks the compressor motor windings and internal parts and which can result in compressor failure.

• After the system has been leak-checked and proven sealed, connect the vacuum pump and evacuate system to 500 microns and hold 500 microns or less for at least 15 minutes. The vacuum pump must be connected to both the high and low sides of the system by connecting

to the two pressure ports. Use the largest size

connections available since restrictive service connections may lead to false readings because of

pressure drop through the fittings.

ST-A1226-182-00

• The suction line must be insulated for its entire

length to prevent dripping (sweating) and prevent performance losses. Closed-cell foam insulation

such as Armaflex and Rubatex® are satisfactory insulations for this purpose. Use 1/2" [12.7 mm]

minimum insulation thickness. Additional insulation

may be required for long runs. The liquid line must be insulated in any unconditioned space when long line sets are used and anytime the liquid line is run

through an attic due to hot temperatures that occur there.

4.8 Final Leak Testing

After the unit has been properly evacuated and service valves opened, a halogen leak detector should be used to detect leaks in the system. All joints and piping within the outdoor unit, evaporator, and interconnecting tubing should be checked for leaks. If a leak is detected, the refrigerant should be recovered before repairing the leak. The Clean Air Act prohibits releasing refrigerant into the

atmosphere.

Tubing

4.0 INSTALLATION

4.9 Control Wiring

WARNING: Turn o electric power

at the fuse box or service panel before making any electrical connections. Also, the ground connection must be completed before making line

voltage connections. Failure to do so can result in

guide below to size the 24-volt control wiring.

Do not use phone cord to connect indoor and

outdoor units and thermostat. This could damage the controls and may not be adequately sized for the control’s electrical load.

electrical shock, severe personal injury, or death.

Running low-voltage wires in conduit with line voltage power wires is not recommended. Low-

voltage wiring should be attached to the pigtails below the control box.

A thermostat and a 24-volt, 40 VA minimum transformer are required for the control circuit of the system. The furnace or the air handler

FIELD WIRE SIZE FOR 24-VOLT THERMOSTAT CIRCUITS:

Runs up to 100 ft [30.5 m]: 18 AWG Runs over 100 ft [30.5 m]: 16 AWG

NOTICE: Do not use control wiring smaller than No. 18 AWG between thermostat and outdoor unit.

transformer may be used if sufficient. See the wiring diagram for reference. Use “Wire Size”

4.10 Typical Control Wiring Connections

WIRE COLOR CODE

The following figures show the typical wiring

connections for a single-stage condensing unit with a gas/oil furnace or with an air-handler with electric heat.

BK – BLACK GY – GRAY W – WHITE BR – BROWN O – ORANGE Y – YELLOW BL – BLUE PR – PURPLE G – GREEN R – RED

CONTROL WIRING FOR GAS OR OIL FURNAC E

Wiring

FOR TYPICAL GAS OR OIL HEAT

BR –BROWN WIRE

YL –YELLOW WIRE

X–WIRE CONNECTION

TYPICAL CONDENSING

UNIT

TYPICAL THERMOSTAT

SUBBASE

YGWR

TYPICAL GAS OR

OIL FURNACE

G Y

CONTROL WIRING FOR AIR-HANDLER WITH ELECTRIC HEAT

A/C Thermostat

WIRING INFORMATION Line Voltage

-Field Installed

-Factory Standard

Air Handler

W/BL

G/BK

W/BK

** For 13kW or higher, W1 and W2 can be connected together for

maximum outlet temperature rise.

*(-)H1P has no Y connection. Connect Y on outdoor unit directly to Y on thermostat on (-)H1P.

A/C Outdoor Unit

4.0 INSTALLATION

4.10 Typical Control Wiring Connections (cont.)

NOTICE: Field wiring must comply with the

National Electric Code (C.E.C. in Canada) and any applicable local code.

4.11 Power Wiring

It is important that proper electrical power from a

commercial utility is available at the outdoor unit

contactor. Voltage ranges for operation are shown

below.

VOLTAGE RANGES

Nameplate Voltage

208/230 187 - 253

Install a branch circuit disconnect within sight of the unit and of adequate size to handle the

minimum circuit capacity (see Section 3.3).

Power wiring must be run in a rain-tight conduit. Conduit must be attached to the hole in the bottom of the control box as shown below.

Operating Voltage Range at Maximum

Load Design Conditions

4.12 Grounding WARNING: The unit must be

permanently grounded. Failure to do so can cause electrical shock resulting in severe personal injury or death.

ST-A1226-09

A grounding lug is provided near the line-voltage power entrance for a ground wire as shown in the

above illustration.

ST-A1226-09

Ground Lug

Contactor

ST-A1226-09

Connect power wiring to line-voltage lugs on the

contactor located in the unit electrical box. (See

wiring diagram attached to unit access panel and

above illustration.) Check all electrical connections, including

factory wiring within the unit and make sure all connections are tight.

DO NOT connect aluminum field wire to the

contactor lugs.

Wiring

5.0 SYSTEM START-UP & REFRIGERANT CHARGING

5.1 System Start-Up Overview

Once the system hardware and wiring has been properly installed, the next step is to start the system up, verify indoor air-flow, and adjust the refrigerant charge. To assure optimum comfort, efficiency, and reliability, it is extremely important to follow the procedures in this section to assure the indoor air-flow and refrigerant charge are correct.

WARNING: Single-pole contactors

are used on all standard single-phase units

through 5 tons. Caution must be exercised when

servicing as only one leg of the power supply is

broken by the contactor.

5.2 Initial System Power-Up

After all installation steps have been completed, apply electrical power to the indoor and outdoor unit only until the indoor air-flow is verified (See Section 5.3).

After the indoor air-flow has been verified and the preliminary refrigerant charge has been weighed in (see section 5.4.2), electrical power may be applied to the outdoor unit. If the unit is equipped with a crankcase heater, it is recommended to wait at least 12 hours after electrical power is applied to the outdoor unit before starting the compressor to assure any liquid refrigerant inside the compressor has been driven out by the crankcase heater.

Start-UpAirow

5.3 Verifying Indoor Air-Flow

The air distribution system has the greatest effect on airflow. The duct system is totally controlled by the contractor. For this reason, the contractor

should use only industry-recognized procedures.

Duct design and construction should be carefully done. System performance can be lowered dramatically through bad planning or workmanship.

Air supply diffusers must be selected and located

carefully. They must be sized and positioned

to deliver treated air along the perimeter of the space. If they are too small for their intended

airflow, they become noisy. If they are not located properly, drafts can result. Return air grilles must be properly sized to carry air back to the blower. If they are too small, they also cause noise.

The installers should balance the air distribution system to ensure proper and quiet airflow to all rooms in the home. This ensures a comfortable

living space.

The correct air quantity is critical to air conditioning systems. Proper operation, efficiency, compressor life, and humidity control depend on the correct balance between indoor load and

outdoor unit capacity. Excessive indoor airflow

increases the possibility of high humidity problems.

Low indoor airflow reduces total capacity and can

cause coil icing. Serious harm can be done to the compressor by low airflow, such as that caused by

refrigerant flooding.

Air-conditioning systems require a specified airflow. Each ton of cooling requires between 320 CFM [151 l/s] and 450 CFM [212 l/s]. See the manufacturer’s spec sheet or the AHRI Directory

(ahridirectory.org) for rated airflow for the system

being installed. The indoor air-ow must be veried to be correct

before the refrigerant charging process can begin. Determine the rated indoor air-ow by referring to the AHRI Directory or manufacturer’s outdoor unit specications for the particular indoor and outdoor unit combination being installed. Then refer to

the air-handler or gas furnace installation manual

to determine how to select the proper air-ow

and make the necessary adjustments to achieve

as close to the rated indoor air-ow as possible. Once the adjustments have been made, the airhandler or gas furnace blower can be started by

turning the thermostat to the heating mode and

adjusting the set point above the room temperature so the air-ow level can be veried using the fol-

lowing methods.

IMPORTANT: Power to the outdoor unit must re-

main o until the indoor air-ow is veried and the

outdoor unit service valves are opened to release the factory refrigerant charge into the line set and indoor coil.

These simple mathematical formulas can be used to determine the CFM [l/s] in a residential or light

commercial system.

Electric resistance heaters can use: CFM = volts x amps x 3.413 SHC x temp rise oF

l/s = Volts x Amps x 0.895 SHC x temp rise oC

5.0 SYSTEM START-UP & REFRIGERANT CHARGING

Gas furnaces can use: CFM = Output Capacity in BTUH* SHC x temp rise oF

l/s = Output Capacity in kW x 895 SHC x temp rise oC

*Refer to furnace data plate for furnace output capacity.

SHC = Sensible Heat Constant (see table below)

An air velocity meter or airflow hood can give a more accurate reading of the system CFM.

The measurement for temperature rise should be performed at the air-handler or furnace return air inlet and in the supply plenum, but

out of direct line of sight of the heater element

or heat exchanger. For best results, measure

air temperature at multiple points and average

the measurements to obtain inlet and outlet

temperatures.

ALTITUDE

FT. [M]

Sea Level 1.08 6000 [1829] 0.87

500 [152]

1000 [305]

2000 [610]

3000 [914]

4000 [1219]

5000 [1524] 0.90 20000 [6096] 0.50

SENSIBLE HEAT

CONSTANT

(SHC)

1.07 7000 [2134] 0.84

1.05 8000 [2438] 0.81

1.01 9000 [2743] 0.78

0.97 10000 [3048] 0.75

0.94 15000 [4572] 0.61

ALTITUDE

FT. [M]

SENSIBLE HEAT

CONSTANT

(SHC)

NOTICE: System maintenance is to be

performed by a qualified and certified technician. The optimum refrigerant charge for any outdoor

unit matched with an indoor coil/air handler is

affected by the application. Therefore, charging data has been developed to assist the field

technician in optimizing the charge. Refer to the charging chart inside the access panel cover on the unit and choose the appropriate column for the

specific model being installed or serviced.

The following method is used for charging systems in the cooling mode. All steps listed should be performed to ensure proper charge has been set.

5.4.1 Measurement Device Set-Up

1. With an R-410A gauge set, attach the highpressure hose to the access fitting on the liquid

(small) service valve at the outdoor unit.

Attach the low-pressure hose to the access fitting

on the service (large) valve at the outdoor unit

3. Attach a temperature probe within 6" [15.2 cm] of the outside of the unit on the copper liquid line (small line). For more accurate measurements, clean the copper line prior to measurement and use a calibrated clamp-on temperature probe or an insulated surface

thermocouple.

5.4.2 Preliminary Charging by

Weight

Charging

5.4 Refrigerant Charging

The refrigerant charge for all systems should be

checked against the Charging Chart located inside the access panel cover.

WARNING:

compressor shell is hot. Touching the compressor

top may result in serious personal injury.

CAUTION:

approximately 60% higher (1.6 times) than R-22

pressures. Use appropriate care when using this refrigerant. Failure to exercise care may result in

equipment damage or personal injury. Charge for all systems should be checked using

the Charging Chart inside the access panel cover.

The top of the scroll

R-410A pressures are

IMPORTANT: Do not operate the

compressor without charge in the system.

Addition of R-410A will raise high-side pressures (liquid and discharge).

NOTICE:

weight for the linear length of the refrigerant line set.

For a new installation, evacuation of interconnecting tubing and indoor coil is adequate; otherwise, evacuate the entire system. Use the factory charge shown in “Electrical and Physical Data” in Section 3.3 of these instructions or on the

unit data plate. Note that the charge value includes charge required for 15 ft. [4.6 m] of standard-size liquid line without a filter drier.

Calculate actual charge required with the actual installed liquid line size and length using:

1/4" [6.4 mm] O.D. = .3 oz./ft. [28.3 g/m] 5/16" [7.9 mm] O.D. = .4 oz./ft. [37.7 g/m] 3/8" [9.5 mm] O.D. = .6 oz./ft. [56.7 g/m] 1/2" [12.7 mm] O.D. = 1.2 oz./ft. [113.3 g/m]

Add 6 oz. [170 g] for field-installed filter drier.

Charge Adjustment = (Line Set (oz./ft.) × Total Linear Length) – Factory Charge for Line Set + 6 oz. (for field installed filter drier)

Example: A three-ton unit requires 75 ft. of line set

with a liquid line diameter of 1/2”.

Adjust the system charge by

5.0 SYSTEM START-UP & REFRIGERANT CHARGING

Factory Charge for Line Set = 15 ft. × .6 oz. = 9 oz. Charge Adjustment = (1.2 oz. × 75 ft.) – 9 oz. +

6 oz. = + 87 oz. With an accurate scale (+/– 1 oz. [28.3 g]) or

volumetric charging device, adjust the refrigerant charge based on the actual line set length. If the entire system has been evacuated, add the total

calculated charge.

IMPORTANT: Charging by weight is

not always accurate since the application can

affect the optimum refrigerant charge. Charging by weight is considered a starting point ONLY. Always check the charge by using the Charging Chart and adjust as necessary. CHARGING BY LIQUID SUBCOOLING PER THE SYSTEM CHARGING CHART MUST BE USED FOR FINAL CHARGE ADJUSTMENT.

[12.8°C] dry bulb and above

3. Locate and note the design pressures. The correct liquid and vapor pressures are found at

the intersection of the installed system and the

outdoor ambient temperature on the Charging

Chart located inside the access panel cover.

Liquid Pressure: = ______psig [kPa]; Vapor Pressure = ______psig [kPa]

NOTICE:

provided are for preliminary charge check ONLY. These pressure values are typical, but may vary due

to application. Evaporator load will cause pressures to deviate.

4. If the measured liquid pressure is below the listed requirement for the given outdoor and indoor conditions, add charge. If the measured liquid pressure is above the listed requirement for the given outdoor and indoor conditions,

remove charge.

The refrigerant pressures

5.4.4 Final Charging by Liquid

Subcooling

IMPORTANT: R-410A is a blended

Charging

refrigerant of R-32 and R-125 (50/50). These

two refrigerants have different saturation curves and therefore change state at different pressures and temperatures. If charge is added to the

system in the vapor state, it is possible to have

a disproportionate amount of each part of the

R-410A blend which will cause unstable and inefficient operation. Therefore, it is critical to add R-410A in the liquid form only!

5.4.3 Preliminary Charging by Pressures

1. Following airflow verification and charge weigh-

in, run the unit for a minimum of 15 minutes

prior to noting pressures and temperatures.

IMPORTANT: Indoor conditions as

measured at the indoor coil must be within 2°F [1.1°C] of comfort conditions per the homeowner's

preference.

NOTICE:

or below this range, run the system to bring the

temperature down or run the electric heat/furnace to

bring the temperature within this range.

2. Note the Outdoor Dry Bulb Temperature, ODDB° = _____°F [°C]. Unit charging is recommended when the outdoor ambient temperature is 55°F

If the indoor temperature is above

1. After preliminary charging by weight or pressures, find the design subcooling value. The correct subcooling value is found at the

intersection of the installed system and the

outdoor ambient temperature on the Charging

Chart located inside the access panel cover.

SC° from Charging Chart = _____°F [°C].

IMPORTANT: Indoor conditions

as measured at the indoor coil are required to be within 2ºF (1.1ºC) of comfort conditions as preferred by the homeowner and must have

operated for at least 15 minutes prior to final charge adjustment. Unit charging is recommended

when the outdoor ambient temperature is 55°F [12.8°C] dry bulb and above.

NOTICE: If the indoor temperature is

above or below the recommended range, run the system to bring the temperature down or run the electric heat/furnace to bring the temperature up.

2. Note the measured Liquid Pressure, Pliq = ______psig [kPa], as measured from the liquid (small) service valve. Use the Temperature Pressure Chart below to note the corresponding saturation temperature for R-410A at the measured liquid pressure.

Liquid Saturation Temperature, SAT°= _____°F [°C].

3. Note the liquid line temperature, Liq° = _____°F [°C], as measured from a temperature probe

5.0 SYSTEM START-UP & REFRIGERANT CHARGING

located within 6" [15.2 cm] outside of the unit on the copper liquid line (small line). It is recommended to use a calibrated clamp-on temperature probe or an insulated surface

thermocouple.

Subtract the liquid line temperature from the

saturation temperature to calculate subcooling. SAT°_____°F

[°C]

- Liq°_____°F

[°C]

= SC°_____°F

[°C]

Adjust charge to obtain the specified subcooling

value. If the measured subcooling level is below the listed requirement for the given outdoor temperature, add charge. If the measured subcooling level is above the listed requirement for the given outdoor temperature, remove

charge.

5.4.5 R-410A Temperature Pressure Chart

SATURA-

-150 [-101] – -30 [-34] 17.9 [123.4] 35 [2] 107.5 [741.2] 100 [38] 317.4 [2188.4]

-140 [-96] – -25 [-32] 22.0 [151.7] 40 [4] 118.5 [817.0] 105 [41] 340.6 [2348.4]

-130 [-90] – -20 [-29] 26.4 [182.0] 45 [7] 130.2 [897.7] 110 [43] 365.1 [2517.3]

-120 [-84] – -15 [-26] 31.3 [215.8] 50 [10] 142.7 [983.9] 115 [46] 390.9 [2695.2]

-110 [-79] – -10 [-23] 36.5 [251.7] 55 [13] 156.0 [1075.6] 120 [49] 418.0 [2882.0]

-100 [-73] – -5 [-21] 42.2 [291.0] 60 [16] 170.1 [1172.8] 125 [52] 446.5 [3078.5]

-90 [-68] – 0 [-18] 48.4 [333.7] 65 [18] 185.1 [1276.2] 130 [54] 476.5 [3285.4]

-80 [-62] – 5 [-15] 55.1 [380.0] 70 [21] 201.0 [1385.8] 135 [57] 508.0 [3502.5]

-70 [-57] – 10 [-12] 62.4 [430.2] 75 [24] 217.8 [1501.7] 140 [60] 541.2 [3731.4]

-60 [-51] 0.4 [2.8] 15 [-9] 70.2 [484.0] 80 [27] 235.6 [1624.4] 145 [63] 576.0 [3971.4]

-50 [-46] 5.1 [35.2] 20 [-7] 78.5 [541.2] 85 [29] 254.5 [1754.7] 150 [66] 612.8 [4225.1]

-40 [-40] 10.9 [75.2] 25 [-4] 87.5 [603.3] 90 [32] 274.3 [1891.2]

-35 [-37] 14.2 [97.9] 30 [-1] 97.2 [670.2] 95 [35] 295.3 [2036.0]

TION

TEMP

ºF [ºC]

R-410A

PSIG

[kPa]

TEMPERATURE PRESSURE CHART

SATURA-

TEMP

ºF [ºC]

TION

R-410A

PSIG

[kPa]

SATURA-

TION

TEMP

ºF [ºC]

R-410A

PSIG

[kPa]

SATURA-

TION TEMP

ºF [ºC]

R-410A

PSIG

[kPa]

5.5 Completing Installation

• Disconnect the hoses from the pressure ports. Replace the pressure port caps and tighten adequately to seal

caps. Do not overtighten.

• Replace the service valve top caps finger-tight and then tighten with a wrench to adequately seal caps. Do not

overtighten.

• Replace control box cover and service panel and install

screws to secure panels.

• Restore power to unit at disconnect if required.

• Configure thermostat per the thermostat installation

instructions and set to desired mode and temperature.

Charging

6.0 SEQUENCE OF OPERATION

When the thermostat calls for cooling, the compressor, outdoor fan motor, and indoor blower motor are energized and the system provides cooling and dehumidication for the conditioned space. When the thermostat call for cooling is satised or turned to the o position, the compressor and outdoor fan motor are de-energized and the indoor blower motor continues to operate for an additional 30 – 45 seconds to extract the residual cooling from

the cold indoor coil.

Operation

7.0 COMPONENTS & CONTROLS

TABLE 6

MODEL

SIZE

CHARGE LIMIT WIT HOUT

CRANKCASE HEAT

7.1 Compressor

Scroll compressors are used in all WA16 condensing units.

7.2 Fan Motor

All WA16 condensing units are equipped with a

standard PSC motor.

Components

7.3 Outdoor Fan

All models utilize a standard paddle 2 or 3 blade

fan made from either aluminum or coated steel.

7.4 Compressor Contractor

All single-phase models utilize a single-pole contactor to power the compressor and fan motor. Field power is connected directly to the terminal lugs on the line side of the contactor.

All heaters are located on the lower half of the compressor shell. Its purpose is to drive refrigerant

from the compressor shell during long off cycles,

thus preventing damage to the compressor during start-up.

At initial start-up or after extended shutdown

periods, make sure the heater is energized for at least 12 hours before the compressor is started.

(Disconnect switch is on and wall thermostat is off.)

7.5 Compressor/ Fan Motor Capacitor

Single-phase models utilize a dual capacitor for

both the compressor and fan motor.

7.6 Compressor Crankcase Heat (CCH)

While scroll compressors usually do not require crankcase heaters, there are instances when a heater should be added. Refrigerant migration

during the off cycle can result in a noisy start up. Add a crankcase heater to minimize refrigerant migration and to help eliminate any start up noise

or bearing “wash out.” NOTE: A crankcase heater should be installed if:

• The system charge exceeds the values listed in the adjacent tables,

• The system is subject to low voltage variations,

• When a low ambient control is used for system operation below 55°F [12.8 ºC].

MAXIMUM SYST EM CHARGE VALUES - 16 SEER

DRAC16A18 DRAC16A24 DRAC16A30 DRAC16A36 DRAC16A42 DRAC16A48 DRAC16A60

*Model size has a factory installed crankcase heater.

9.6 lbs. [4.4 kg]

9.6 lbs. [4.4 kg] 12 lbs. [5.4 kg]

7.0 COMPONENTS & CONTROLS

7.7 High- and Low-Pressure Controls (HPC and LPC)

HPC and LPC are not factory installed, but can be field installed using the following kits:

RXAB-A07 (High Pressure Control) RXAC-A10 (Low Pressure Control) These controls keep the compressor from

operating in pressure ranges which can cause damage to the compressor. Both controls are in the low-voltage control circuit.

The high-pressure control (HPC) is an automaticreset which opens near 610 PSIG [4206 kPa] and closes near 420 PSIG [2896 kPa].

7.8 Compressor Hard Start Components

The low-pressure control (LPC) is an automaticreset which opens near 50 PSIG [345 kPa] and closes near 95 PSIG [655 kPa].

CAUTION: The compressor has an

internal overload protector. Under some conditions,

it can take up to 2 hours for this overload to reset.

Make sure overload has had time to reset before

condemning the compressor.

Components

Start components are not usually required with the scroll compressors, but are available for special cases and where start components are desirable

to reduce light dimming. Hard start components

must be field installed and are available through the manufacturer's parts department or from the wholesale distributor.

8.0 ACCESSORIES

WARNING: Turn o electric power

at the fuse box or service panel before making any

electrical connections when installing accessories.

Failure to do so can result in electrical shock, severe personal injury, or death.

CAUTION:

SINGLE POLE COMPRESSOR CONTACTOR (CC):

Single pole contactors are used on all single-

phase units. Caution must be exercised when

servicing as only one leg of the power supply is

broken with the contactor.

8.1 Compressor Time Delay

The time delay (TDC) is in the low voltage control

circuit. When the compressor shuts off due to a

Accessories

power failure or thermostat operation, this control keeps it off at least 5 minutes before the next cycle can begin.

be used on all equipment frequently operated below 70°F [21°C] ambient. Part No. RXAD-A08

8.5 Compressor Hard Start Kit

1.5–5.0 Ton 208/230V Single Phase Models: Part No. SK-A1

8.6 Compressor Crankcase Heater

1.5–3.0 Ton 208/230V Single Phase Models: Part No. 44-101884-08 (w/outdoor temp. thermostat) or

44-17402-44 (w/o outdoor temp. thermostat)

3.5–5.0 Ton 208/230V Single Phase Models: Part No. 44-103663-13 (w/outdoor temp. thermostat) or

44-17402-45 (w/o outdoor temp. thermostat)

8.7 Compressor Sound Enclosure

8.2 High Pressure Control

1.5 – 5 Ton Models: RXAB-A07

Note: Units with model numbers ending in “B”

have a factory installed high pressure control.

8.3 Low Pressure Control

1.5 – 5 Ton Models: RXAC-A07

Note: Units with model numbers ending in “B”

have a factory installed low pressure control.

8.4 Low Ambient Control

This component senses compressor head pressure

and shuts the outdoor fan off when the head

pressure drops to approximately 250 PSIG [1,724 kPa]. This allows the unit to build a sufficient head pressure at lower outdoor ambient temperatures (down to 0°F [-18°C]) in order to maintain system balance and capacity. Low ambient control should

1.5–3.0 Ton Models: Part No. 68-23427-26

3.5–5.0 Ton Models: Part No. 68-23427-25

9.0 DIAGNOSTICS & TROUBLESHOOTING

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9.1 Cooling Mechanical Checks Flowchart

Diagnostics

9.0 DIAGNOSTICS & TROUBLESHOOTING

9.2 General Troubleshooting Guide

WARNING:

Disconnect all power to unit before servicing. Contactor may break only one side.

Failure to shut off power can cause electrical shock resulting in personal injury or death.

SYMPTOM POSSIBLE CAUSE REMEDY

Unit will not run • Power o or loose electrical connection

Outdoor fan runs, compressor doesn't

Diagnostics

Insucient cooling • Improperly sized unit

Compressor short cycles

Registers sweat • Low indoor airow • Increase speed of blower or reduce restriction.

High head, low

suction pressures

High head, high or normal suction pressure

Low head, high vapor

pressures

Low suction

pressure, iced indoor

coil

High suction pressure • Excessive load

Fluctuating head and suction pressures

Gurgle or pulsing noise at expansion

device or liquid line

• Thermostat out of calibration – set too low or

high

• Blown fuses/tripped breaker

• Transformer defective

• High-pressure or low-pressure control open (if equipped)

• Miswiring of thermostat

• Run or start capacitor defective

• Start relay defective

• Loose connection

• Compressor stuck, grounded or open motor winding, open internal overload.

• Low-voltage condition

• Improper indoor airow

• Incorrect refrigerant charge

• Air, noncondensibles, or moisture in system

• Restricted refrigerant circuit

• Incorrect voltage

• Defective overload protector

• Refrigerant undercharge or overcharge (LPC or

HPC cycling)

• Restriction in liquid line, expansion device, or lter drier

• Bad TXV

• Dirty outdoor coil

• Refrigerant overcharge

• Outdoor fan not running

• Air or noncondensibles in system

• Bad TXV

• Bad compressor

• Low indoor airow

• Operating below 65°F [18°C] outdoors

• Moisture in system

• Low refrigerant charge

• Defective compressor

• TXV hunting

• Air or noncondensibles in system

• Undercharged system

• Check for correct voltage at line voltage connections in

condensing unit.

• Reset.

• Replace fuses/reset breaker.

• Check wiring. Replace transformer.

• See high head pressure or low suction pressure rem-

edies.

• Check refrigerant charge and check for leaks.

• Check thermostat wiring.

• Replace.

• Check for correct voltage at compressor. Check and

tighten all connections.

• Wait at least 3 hours for overload to reset. If still open,

replace the compressor.

• Add start kit components.

• Recalculate load.

• Check. Should be approximately 400 CFM [189 L/s]

per ton.

• Charge per procedure attached to unit service panel.

• Recover refrigerant. Evacuate and recharge. Add or replace lter drier.

• Locate restriction and clear.

• At compressor terminals, voltage must be ± 10% of

nameplate marking when unit is operating.

• Replace compressor. Check for correct voltage.

• Adjust charge per charging chart.

Replace air lter.

• Remove or replace defective component.

• Replace TXV.

• Clean coil.

• Correct system charge.

• Repair or replace.

• Recover refrigerant. Evacuate and recharge.

• Replace TXV.

• Replace compressor.

• Increase speed of blower or reduce restriction. Replace air lter.

• Add Low Ambient Kit.

• Recover refrigerant. Evacuate and recharge. Add lter

drier.

• Check refrigerant charge and check for leaks.

• Recheck load calculation.

• Replace.

• Check TXV bulb clamp. Check air distribution on coil. Replace TXV.

• Recover refrigerant. Evacuate and recharge.

• Adjust charge per charging chart.

9.0 DIAGNOSTICS & TROUBLESHOOTING

9.3 Service Analyzer Charts

COMPRESSOR OVERHEATING

SYMPTOM POSSIBLE CAUSE CHECK/REMEDY

High superheat (greater

than 15°F [8.3°C] at coil)

Low line voltage Loose wire connections Check wiring.

High line voltage Power company problem Report problem

Low charge Check system charge.

Faulty metering device Restricted cap tube, TXV

Power element superheat out of adjustment internally

Foreign matter stopping ow

High internal load Hot air (attic) entering return

Heat source on; miswired or faulty control

Restriction in liquid line Drier plugged.

Line kinked.

Low head pressure Low charge

Operating in low ambient temperatures

Suction or liquid line subjected to high heat source Hot attic

Hot water line

Power company problem, transformer Report problem

Undersized wire feeding unit Correct and complete diagnosis.

Diagnostics

High head pressure

Short cycling of compressor

Overcharge Check system charge.

Dirty outdoor coil Clean coil.

Faulty or wrong size outdoor fan motor Replace fan motor. Check capacitor.

Faulty fan blade or wrong rotation Replace fan blade.

Replace with correct rotation motor.

Recirculation of air Correct installation.

Additional heat source Check for dryer vent near unit.

Check for recirculation from other equipment.

Noncondensibles Recover refrigerant. Evacuate and recharge system.

Equipment not matched Correct mismatch.

Cycling or faulty pressure control (if equipped) Check pressure and address cause of high or low pressure.

Replace pressure control if faulty.

Loose wiring Check unit wiring.

Thermostat Located in supply air stream

Dierential setting too close

Customer misuse

Indoor coil TXV restricted Internal foreign matter

Power element failure

TXV too small

Equalizer tube plugged.

Indoor coil distributor tube restricted Restricted with foreign matter

Kinked

Inside diameter reduced from previous compressor failure

9.0 DIAGNOSTICS & TROUBLESHOOTING

9.3 Service Analyzer Charts (cont.)

COMPRESSOR OVERHEATING (cont.)

SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES

Short cycling of compressor (cont.)

Faulty Compressor Valves or scrolls

Diagnostics

ELECTRICAL

SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES

Voltage present on load side of compressor contactor and compressor

won't run

Voltage present on line side of compressor contactor only

No voltage on line

side of compressor contactor

Low charge Check system charge.

Low evaporator airow Dirty coil

Dirty lter

Duct too small or restricted

Faulty run capacitor Replace.

Faulty internal overload Replace compressor.

Fast equalization/Low pressure dierence Replace compressor and examine system to

locate reason.

Compressor start components Check start capacitor.

Check potential relay.

Run capacitor Check with ohmmeter

Internal overload Allow time to reset.

Compressor windings Check for correct ohms.

Thermostat Check for control voltage to contactor coil.

Compressor control circuit High-pressure switch

Low-pressure switch

Ambient thermostat

Solid-state protection control or internal thermal sensors

Compressor timed o/on control or interlock

Blown fuses or tripped circuit breaker Check for short in wiring or unit.

Improper wiring Recheck wiring diagram.

Improper voltage High voltage Wrong unit

Power supply problem

Low voltage Wrong unit

Power supply problem

Wiring undersized

Loose connections

Single Phasing (3 phase) Check incoming power and fusing.

FLOODED STARTS

SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES

Liquid in the

compressor shell

Too much liquid in

system

Faulty or missing crankcase heater Replace or add crankcase heater.

Incorrect piping Check piping guidelines.

Overcharge Check and adjust charge.

9.0 DIAGNOSTICS & TROUBLESHOOTING

9.3 Service Analyzer Charts (cont.)

CONTAMINATION

SYMPTOM POSSIBLE CAUSE REMEDY

Moisture Poor evacuation on installation or during service

High head pressure Noncondensibles air

Unusual head and suction readings

Foreign matter –

copper lings

Copper oxide Dirty copper piping or nitrogen not used when

Welding scale Nitrogen not used during brazing

Soldering ux Adding ux before seating copper partway

Excess soft solder Wrong solder material

LOSS OF LUBRICATION

SYMPTOM POSSIBLE CAUSE REMEDY

Compressor failures Vapor line tubing too large Reduce pipe size to improve oil return.

Low suction pressure Low charge Check system charge.

Cold, noisy compressor – Slugging

Noisy compressor Refrigerant migration in o-cycle Check or add crankcase heater.

Cold, sweating

compressor

Low load Reduced indoor airow Dirty lter

Short cycling of compressor

Wrong refrigerant or mixed refrigerants

Copper tubing cuttings

brazing

Refrigerant leaks Repair and recharge.

Dilution of oil with refrigerant Observe piping guidelines.

Flooding Check system charge.

Thermostat setting Advise customer.

Cycling of faulty high or low pressure control Check pressure and address cause of high or low pressure.

Loose wiring Check all control wires.

Thermostat In supply air stream, out of calibration

In each case, the cure is the same. Recover refrigerant. Add lter drier, evacuate, and recharge.

Dirty indoor coil

Wrong duct size

Restricted duct

Replace control if faulty.

Customer misuse

Diagnostics

SLUGGING

SYMPTOM POSSIBLE CAUSE REMEDY

On start-up Incorrect piping Review pipe size guidelines.

TXV hunting when

running

Faulty indoor TXV Replace TXV.

9.0 DIAGNOSTICS & TROUBLESHOOTING

9.3 Service Analyzer Charts (cont.)

FLOODING

SYMPTOM POSSIBLE CAUSE REMEDY

Loose sensing bulb Secure the bulb and insulate.

Poor system control

using a TXV

THERMOSTATIC EXPANSION VALVE (TXV)

SYMPTOM POSSIBLE CAUSE REMEDY

Diagnostics

High Superheat, Low

Suction Pressure

(superheat over

15°F [8.3°C])

Valve feeds too much

refrigerant, with low

superheat and higher

than normal suction

pressure

Bulb in wrong location Relocate bulb.

Wrong size TXV Use correct replacement.

Improper superheat setting (less than 5°F [2.8°C])

Moisture freezing and blocking valve Recover charge, install lter-drier, evacuate system,

Dirt or foreign material blocking valve Recover charge, install lter-drier, evacuate system,

Low refrigerant charge Correct the charge.

Vapor bubbles in liquid line Remove restriction in liquid line. Correct the refrigerant

Misapplication of internally equalized valve Use correct TXV.

Plugged external equalizer line Remove external equalizer line restriction.

Undersized TXV Replace with correct valve.

Loss of charge from power head sensing bulb Replace power head or complete TXV.

Charge migration from sensing bulb to power head (Warm power head with warm, wet cloth.

Does valve operate correctly now?)

Moisture causing valve to stick open. Recover refrigerant, replace lter-drier, evacuate system,

Dirt or foreign material causing valve to stick open

TXV seat leak (a gurgling or hissing sound is heard AT THE TXV during the o cycle, if this is the cause). NOT APPLICABLE TO BLEED PORT

VALVES.

Oversized TXV Install correct TXV.

Incorrect sensing bulb location Install bulb with two mounting straps, in 2:00 or 4:00

Low superheat adjustment Replace TXV.

Incorrectly installed, or restricted external equalizer line

Replace TXV.

recharge.

charge.

Remove noncondensible gases.

Size liquid line correctly.

Ensure TXV is warmer than sensing bulb.

and recharge.

Recover refrigerant, replace lter drier, evacuate system,

and recharge.

Replace the TXV.

position on suction line, with insulation.

Remove restriction, or relocate external equalizer.

9.0 DIAGNOSTICS & TROUBLESHOOTING

9.3 Service Analyzer Charts (cont.)

THERMOSTATIC EXPANSION VALVES (cont.)

SYMPTOM POSSIBLE CAUSE REMEDY

Compressor ood

back upon start-up

Superheat is low to

normal with low

suction pressure

Superheat and

suction pressure

uctuate (valve is

hunting)

Valve does not

regulate at all

Refrigerant drainage from ooded evaporator Install trap riser to the top of the evaporator coil.

Inoperable crankcase heater or crankcase heater

needed

Unequal evaporator circuit loading Ensure airow is equally distributed through evaporator.

Low load or airow entering evaporator coil Ensure blower is moving proper air-ow.

TXV is oversized Install correct TXV.

Sensing bulb is aected by liquid refrigerant or refrigerant oil owing through suction line

Unequal refrigerant ow through evaporator

circuits

Moisture freezing and partially blocking TXV Recover refrigerant, change lter-drier, evacuate system,

External equalizer line not connected or line

plugged

Sensing bulb lost its operating charge Replace TXV.

Valve body damaged during soldering or by

improper installation

Replace or add crankcase heater.

Check for blocked distributor tubes.

Remove/Correct any airow restriction.

Relocate sensing bulb in another position around the

circumference of the suction line.

Ensure sensing bulb is located properly.

Check for blocked distributor tubes.

and recharge.

Connect equalizer line in proper location, or remove any blockage.

Replace TXV.

Diagnostics

9.0 DIAGNOSTICS & TROUBLESHOOTING

9.4 Troubleshooting Tips

COOLING MODE

TROUBLESHOOTING TIPS

INDICATORS

SYSTEM

PROBLEM

Overcharge

Undercharge

Liquid Restriction

(Filter Drier)

Low Indoor Airow

Diagnostics

Dirty Outdoor Coil

Low Outdoor

Ambient Temperature

Inefcient

Compressor

Indoor TXV Sensing

Bulb Charge Lost

Poorly Insulated

Indoor TXV

Sensing Bulb

DISCHARGE

PRESSURE

High High Low High High

Low Low High Low Low

Low Low High High Low

Low Low Low Low Low

High High Low Low High

Low Low High High Low

Low High High High Low

Low Low High High Low

High High Low Low High

SUCTION

PRESSURE

SUPERHEAT

Normal: 5°–15°F

[2.8° – 8.3°C]

SUBCOOLING

Normal: See

Charging Chart

COMPRESSOR

AMPS

10.0 OUTDOOR UNIT MAINTENANCE

10.1 Outdoor Coil Cleaning

The outdoor fan draws air across the coil during

operation which results in contaminants collecting

on and between the aluminum fins. These

contaminants restrict the air-flow through the coil resulting in reduced capacity and efficiency and increases the temperature of the components that

can reduce their life. Therefore, it is recommended that the outdoor coil be cleaned at least annually by a qualified service technician using a non-

corrosive coil cleaner and low pressure water

hose sprayer. Care must be taken not to damage or flatten out the fins by spraying the fins from

an angle. Washing from the top of the coil down from the inside out is the most effective method

of cleaning the coil. The exterior louver panels and unit top are easily removable to facilitate the coil

cleaning task.

WARNING: Disconnect electrical power to the unit before removing the top panel or any electrical panel as the fan motor could start at any time and live electrical connections will be exposed.

10.2 Cabinet Cleaning and Care

Annual cleaning of the exterior cabinet is recommended using a mild detergent, water, and cloth/sponge to remove dust, mold, and potentially

corrosive contaminants that have collected on

the cabinet. It is also recommended to apply a good quality automotive wax to the painted metal cabinet parts annually to protect the finish and to

restore the gloss of the paint. Do not apply wax to the plastic parts.

Maintenance

10.3 Motor Lubrication

The bearings in the outdoor motor are prelubricated by the motor manufacturer and do not have oiling ports. The motor will run for

an indefinite period of time without additional

lubrication.

10.4 Replacement Parts

Any replacement part used to replace parts

originally supplied on equipment must be the same

as or an approved alternate to the original part

supplied. The manufacturer will not be responsible

for replacement parts not designed to physically fit or operate within the design parameters the original parts were selected for.

11.0 WIRING DIAGRAM

01-19-04

JHB

90-101229-01

Wiring Diagrams

434445

Durastar DRAC16 Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual