EcoNet A2024AJVCA User manual

1
VARIABLE SPEED R-410A
AIR CONDITIONING
OUTDOOR UNITS
Enabled
(-)A20 (20 SEER) EQUIPPED WITH
ECONET™ COMMUNICATIONS
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.
Do not destroy this manual.
Please read carefully and
keep in a safe place for future
reference by a serviceman.
[ ] indicates metric conversions.
92-104921-12-07 ( / ) Printed in USA

2
CONTENTS
1.0 IMPORTANT SAFETY INFORMATION.......................................................3
2.0 GENERAL INFORMATION.....................................................................4-5
2.1 Introducon..........................................................................................4
2.2 Agency Performance Audit Tesng Noce...........................................4
2.3 Importance of a Quality Installaon.....................................................4
2.4 System Sizing and Selecon..................................................................4
2.5 Importance of Proper Indoor/Outdoor Match-Ups..............................5
2.6 Checking Product Received...................................................................5
2.7 Compressor Break-In Noce ................................................................5
3.0 UNIT SPECIFICATIONS..........................................................................5-6
3.1 Model Number Nomenclature and Available Models..........................5
3.2 Electrical and Physical Data ..................................................................6
4.0 INSTALLATION...................................................................................7-24
4.1 Tools & Refrigerant .............................................................................7
4.1.1 Tools Required for Installing & Servicing R-410A Models...........7
4.1.2 Specicaons of R-410A..............................................................7
4.1.3 Quick Reference Guide for R-410A..............................................7
4.2 Choosing a Locaon.............................................................................8
4.2.1 Allowable Clearances..................................................................8
4.2.2 Operaonal Issues Related to Unit Locaon...............................8
4.2.3 Corrosive Environments..............................................................9
4.2.4 Customer Sasfacon Issues.......................................................9
4.3 Mounng Unit......................................................................................9
4.3.1 Unit-Mounng Methods ............................................................9
4.3.2 High Wind and Seismic Tie-Down Methods ................................9
4.3.3 Elevang Unit ...........................................................................10
4.4 Refrigerant Line Set Selecon............................................................10
4.4.1 Replacing Exisng Systems.......................................................10
4.4.2 Line Set Applicaon .................................................................10
4.4.2.1 Oil Return to Compressor ...........................................10
4.4.2.2 Refrigerant Migraon During O Cycle.......................10
4.4.2.3 Maximum Liquid Pressure Drop..................................11
4.4.2.4 Liquid Line Refrigerant Flashing..................................11
4.4.2.5 Compressor Oil Level Adjustment...............................11
4.4.2.6 Capacity Losses ...........................................................11
4.4.3 Line Set Length and Fing Losses ..........................................11
4.4.4 Liquid Line Selecon ...............................................................12
4.4.5 Sucon Line Selecon.............................................................12
4.5 Line Set Installaon ...........................................................................15
4.5.1 Important Tubing Installaon Pracces...................................15
4.5.2 Relave Locaon of Indoor and Outdoor Units.......................16
4.5.2.1 Indoor and Outdoor Unit Near Same Level................16
4.5.2.2 Outdoor Unit Below Indoor Unit................................17
4.5.2.3 Outdoor Unit Above Indoor Unit ...............................18
4.5.3 Tubing Connecons ................................................................19
4.6 Inial Leak Tesng.............................................................................20
4.7 Evacuaon.........................................................................................20
4.8 Final Leak Tesng ..............................................................................21
4.9 Control Wiring...................................................................................21
4.9.1 EcoNetTM Communicaons ......................................................21
4.9.2 EcoNetTM Control Center Installaon .......................................21
4.9.3 EcoNetTM Communicaon Wiring Connecons .......................21
4.9.4 Convenonal 24VAC Thermostat Control Wiring Connecons ........22
4.10 Power Wiring.....................................................................................23
4.11 Grounding..........................................................................................24
5.0 SYSTEM START-UP AND REFRIGERANT CHARGING...........................24-28
5.1 System Start-Up Overview.................................................................24
5.2 Inial Power Up and EcoNetTM Communicaon Vericaon.............24
5.3 EcoNetTM Control Center Set-Up ........................................................24
5.4 Inial System Set-Up .........................................................................24
5.5 Entering Charging Mode Using EcoNet
TM
Control Center Service Menu .........25
5.6 Entering Charging Mode When Using a Convenonal 24VAC Thermostat ...25
5.7 Indoor Air-Flow Vericaon ..............................................................26
5.8 Refrigerant Charging .........................................................................26
5.8.1 Measurement Device Set-Up ..................................................27
5.8.2 Preliminary Charging by Weight ..............................................27
5.8.3 Preliminary Charging by Pressures ..........................................27
5.8.4 Final Charging by Liquid Subcooling ........................................28
5.8.5 R-410A Temperature Pressure Chart .......................................28
5.9 Compleng Installaon .....................................................................28
6.0 NORMALSEQUENCEOF OPERATION..................................................29-30
6.1 Cooling Mode.....................................................................................29
6.2 On-Demand Cooling Dehumidicaon..............................................29
6.3 Low Ambient Cooling Operaon .......................................................29
6.4 Sequence of Operaon for Convenonal 24VAC Thermostat Controls ...........30
7.0 COMPONENTS AND CONTROLS......................................................30-36
7.1 Accumulator.......................................................................................30
7.2 Choke/Indoor ....................................................................................30
7.3 Coil Temperature Thermistor.............................................................30
7.4 Compressor.........................................................................................31
7.5 Compressor Sump Thermistor ..........................................................31
7.6 Discharge Line Thermistor ................................................................31
7.7 EcoNetTM Variable Speed Outdoor Control (VSODC)..........................32
7.7.1 Board Features and Connecons .............................................32
7.7.2 TEST & SW2 Buons ................................................................33
7.7.3 Memory Card ...........................................................................33
7.7.4 Menu Structure ........................................................................33
7.7.5 Replacement of the VSODC ......................................................33
7.8 Filter & Ferrite Rings ...........................................................................34
7.9 High Pressure Control .........................................................................34
7.10 Outdoor Ambient Temperature Thermistor ......................................34
7.11 Outdoor Fan Motor ............................................................................35
7.12 Outdoor Fan Blade .............................................................................35
7.13 Power Inverter Compressor Control ..................................................35
7.14 Sucon Pressure Transducer ..............................................................36
7.15 Sucon Temperature Thermistor .......................................................36
8.0 ACTIVE SYSTEM PROTECTION FEATURES..........................................37-39
8.1 Minimum Run Timer ..........................................................................37
8.2 Oil Return Cycle ..................................................................................37
8.3 Oil Diluon .........................................................................................37
8.4 O-Cycle Refrigerant Migraon – Stator Heat ..................................37
8.5 High Discharge Temperature ..............................................................37
8.6 High Discharge Pressure .....................................................................37
8.7 Low Sucon Pressure/Loss of Charge ................................................38
8.8 Compressor Shut-Down Sequence for High or Low Refrigerant Pressure Fault ....38
8.9 Overcurrent and Current Imbalance ..................................................38
8.10 Compressor Operaon Outside Envelope .........................................38
8.11 Over and Under Voltage .....................................................................39
8.12 Inverter Over Temperature ................................................................39
8.13 Controls and Communicaon Malfuncon .......................................39
8.14 Sensor Failure Default Operaon .......................................................39
8.15 Exing Acve Protecon Lock-Out Mode ..........................................39
9.0 DIAGNOSTICS AND TROUBLESHOOTING.........................................40-66
9.1 Fault Recall Procedure .......................................................................40
9.2 Compressor/Fan Motor Test Mode ...................................................40
9.3 Status and Diagnosc Codes ..............................................................41
9.4 Acve Protecon Fault Details ..........................................................50
9.5 Electrical Checks Flowchart ...............................................................56
9.6 Cooling Mechanical Checks Flowchart .............................................57
9.7 Checking Transducers and Temperature Sensors ..............................58
9.8 General Troubleshoong Guide ........................................................60
9.9 Service Analyzer Charts .....................................................................61
9.10 Troubleshoong Tips .........................................................................66
10.0 OUTDOOR UNIT MAINTENANCE .........................................................67
10.1 Outdoor Coil Cleaning .....................................................................67
10.2 Cabinet Cleaning and Care ..............................................................67
10.3 Motor Lubricaon ...........................................................................67
10.4 Replacement Parts ..........................................................................67
11.0 WIRING DIAGRAM ..............................................................................68
12.0 APPENDIX ......................................................................................69-70
12.1 Agency Performance Audit Test Instrucons ....................................69
Contents

3
Safety
1.0 IMPORTANT SAFETY INFORMATION
WARNINGS:
These instructions are intended as an aid to
qualied, 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 re, 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 specication 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 xed
expansion 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 a signicant amount of mineral oil which
is incompatible with the POE oil used in R-410A
systems and could result in reliability issues with the
compressor and expansion devices.
When the indoor coil or air handler is installed over a
nished ceiling and/or living area, it is required that an
auxiliary overow pan be constructed and installed
under the entire indoor unit. Failure to do so can
result in property damage.
UNIT MAY START SUDDENLY AND WITHOUT
WARNING. The 7 segment LED on the Outdoor
Control will ash c or C when a call for unit operation
is present, but the unit is in temporary lockout.
The variable speed outdoor control will attempt to
start unit after the anti-short cycle time expires or
when a high or low pressure control automatically
resets.
• This product is not approved for installation at 2000
meters [6561 feet] above sea level or higher. Installation
at higher altitudes may result in control and unit
failures due to electrical arc tracking between electrical
components on the invertor drive control board. Possibly
resulting in fire, electrical shock, property damage,
personal injury, or death.

4
General Information
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 (-)A20 series condensing units are specically
designed to operate with matching communicating
EcoNet™ enabled air-handlers, gas furnaces, and
Control Center. A conventional 24VAC 2-stage
thermostat can be used, but many features and
benets are lost, so this is only recommended for
emergency situations when there are issues with
the EcoNet™ communications and the system
must be made operational until the communication
issues are resolved.
This installation instruction manual contains
complete instructions for installation and setup
using the EcoNet™ or conventional 24VAC
controls. Please refer to the manufacturer’s
specication sheets for complete performance
data, thermostat, and accessory listings.
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 Agency
Performance Audit
Testing Notice
For purposes of verifying or testing efciency
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.
Should this unit be selected for performance audit
testing, follow the instructions included in the
Appendix (Section 12.1) of this manual.
2.3 Importance of
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 certied AHRI capacity and
efciency ratings with the appropriate outdoor
units. However, proper refrigerant charge, proper
airow, and refrigerant line sizing are critical to
achieve optimum capacity and efciency and
to assure reliable operation. Installation of
this product should follow the manufacturer’s
refrigerant charging and airow instructions
located in this installation manual and the charging
chart label afxed to the outdoor unit. Failure to
conrm proper charge and airow may reduce
energy efciency 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:
• ANSI/NFPA No. 70-(Latest Edition) National
Electrical Code.
• NFPA90A Installation of Air Conditioning and
Ventilating Systems.
• NFPA90B Installation of warm air heating and air
conditioning systems.
Install the unit in such a way as to allow necessary
access to the coil/lter rack and blower/control
compartment.
2.4 System Sizing and
Selection
Before specifying any air-conditioning equipment,
a survey of the structure, a heat gain calculation must
be made. A heat gain calculation involves identifying
all surfaces and openings that allow heat to enter the
building and determines the amount of heat needed to
be removed. A heat gain calculation also
calculates the extra heat load caused by sunlight
and by humidity removal.

5
General Information Unit Specications
These factors must be considered before selecting an
air conditioning system. The Air Conditioning Con-
tractors 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 airow
• Proper equipment evacuation
• Supply and return air duct design and sizing
• Refrigerant charge
• System air balancing
• Diffuser and return air grille location and sizing
2.0 GENERAL INFORMATION
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 qualied HVAC
professionals. For technical assistance, contact
your Distributor Service Coordinator.
2.5 Importance of
Proper Indoor/Outdoor
Match-Ups
3.0 UNIT SPECIFICATIONS
3.1 Model Number Nomenclature and Available Models
(-) A20 36 AJVCA
MINOR SERIES
CONTROLS
C - COMMUNICATING
TYPE
V - INVERTER
VOLTAGE
J = 1 PH, 208-230/60
MAJOR SERIES
A = 1st GENERATION
CAPACITY
24 = 24000 BTU/HR [7.03 kW]
36 = 36000 BTU/HR [10.55 kW]
48 = 48000 BTU/HR [14.07 kW]
60 = 60000 BTU/HR [17.58 kW]
20 SEER
AIR CONDITIONER
BRAND
(-)A2024AJVCA
(-)A2036AJVCA
(-)A2048AJVCA
(-)A2060AJVCA
AVAILABLE MODELS
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 conrm
the air-handler and outdoor unit are a certied
combination in the AHRI Directory.
2.6 Checking Product
Received
Upon receiving unit, inspect it for any shipping
damage. Claims for damage, either apparent or
concealed, should be led 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.
2.7 Compressor
Break-In Notice
Prior to performance audit testing, system must be
operated 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.

6
Unit Specications
3.0 UNIT SPECIFICATIONS
3.2 Electrical and Physical Data
DIMENSIONS
(-)A20 24A 36A 48A 60A
Height “H” inches (mm)
Length “L” inches (mm)
Width “W” inches (mm)
39 (911)
33.75 (857)
33.75 (857)
33.75 (857)
33.75 (857)
39 (911) 51 (1295)
35.75 (908)
35.75 (908)
51 (1295)
35.75 (908)
35.75 (908)
ST-A1226-02-00
ALLOW 60” [1524mm]
OF CLEARANCE
A
I
R
D
I
S
C
H
A
R
G
E
SERVICE PANELS/
INLET CONNECTIONS /
HIGH & LOW VOLTAGE
ACCESS ALLOW
24” [ 610 mm] OF
CLEARANCE
AIR INLET LOUVERS ALLOW
6” [152mm] Min. OF CLEARANCE ALL SIDES
12” [305mm] RECCOMMENDED
Rev. 11/15 Electrical
Fuse or HACR Circuit
Breaker
Compressor
Rated Load
Amperes
(RLA)
Locked
Rotor
Amperes
(LRA)
Model
Number
(-)A20
Phase
Frequency (Hz)
Voltage (Volts)
Fan Motor
Full Load
Amperes
(FLA)
Minimum
Amperes
Maximum
Amperes
24
36
48
60
1-60-208/230
1-60-208/230
1-60-208/230
1-60-208/230
15.0/15.0
20.1/20.1
32.0/32.0
34.1/34.1
35
35
50
50
1.4
3.5
5.3
5.3
25
35
60
60
35
45
70
80
Model
Number
(-)A20
Rev. 11/15
Face Area
Sq. Ft. [m2]
No. Rows CFM [L/s]
Refrig. Per
Circuit Oz.
[g]
Net Lbs.
[kg]
Shipping
Lbs. [kg]
Outdoor Coil
Physical
Weight
24
36
48
60
22.23
22.34
32.45
32.45
1
1
1
2
3328/1796/1264
4313/2065/1050
6242/3212/1853
6173/2932/1466
148 (4195)
1936
(5488)
196 (5556)
376 (10659)
198
236
255
300
206
244
263
307
“W”
“L”
“H”

7
4.0 INSTALLATION
4.1 Tools and Refrigerant
4.1.1 Tools Required for
Installing and Servicing
R-410A Models
Tools
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
Ambient and Tube
Thermometers Crescent Wrench
Allen Wrench
Manifold
Gauge
Set
Brazing
Rods
Recovery
Cylinders
Torch Reclaimer Nitrogen
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.
Application: R-410A is not a drop-in
replacement for R-22 . Equipment designs must
accommodate its higher pressures. It cannot be
retrotted into R-22 equipment.
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 diuoromethane (HFC-
32) and 50% by weight pentauoroethane (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
4.1.2 Specications of 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 minimum working
pressure of 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.

8
4.0 INSTALLATION
4.2 Choosing a Location
4.2.1 Allowable Clearances
12” to side intake louvers
24” to service access panels
60” vertical for fan discharge
If space limitations exist, the following clearances
will have minimal impact to capacity and efciency
and are permitted:
Single-Unit Applications: Minimum of 6” 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 2 ton
models and 9” [22.9 cm] for 3 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 simplied
servicing of the outdoor unit.
Location
NOTICE: These units must be installed
outdoors. No ductwork can be attached, or
other modications made, to the discharge grille.
Modications will affect performance or operation.
4.2.2 Operational Issues
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.
IMPORTANT: Locate the unit
ST-A1226-04-00
ALLOW 60” [1524 mm]
OF CLEARANCE
AIR INLET LOUVERS ALLOW
6” [152 mm] Min. OF
CLEARANCE ALL SIDES
12” [305 mm] RECOMMENDED
6” MIN. (152 mm) FOR 1.5 & 2 TON
9” MIN. (229 mm) FOR 2.5-5 TON
24” MIN. (610 mm)
SERVICE PANELS/
INLET CONNECTIONS
/ HIGH & LOW
VOLTAGE ACCESS
ALLOW 24” [610 mm] OF
CLEARANCE
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 roof-lines, 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 the fan discharge (unit
top) to prevent recirculation
6” [15.2 cm] to the coil grille air inlets
with 12” [30.5 cm] minimum recommended

9
4.0 INSTALLATION
4.2 Choosing a Location (cont.)
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 reneries.
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
airow 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 nish.
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.
Regular cleaning and waxing of the cabinet with
a good automobile polish will provide some
protection.
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 sufcient
distance above grade to prevent ground water
from entering the unit.
Location
4.3.1 Unit Mounting Methods
4.3 Unit Mounting
The outdoor unit may be mounted in a number of
ways. The most common method is on the ground
mounted on a concrete or pre-fabricated pad. It
can also be mounted on a ground or roof mounted
metal frame, wooden frame, or 4” x 4” 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 specic 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 in the PTS (Product Technical
Support) section of the manufacturer’s Web sites
MyRheem.com, or MyRuud.com and can be found
as a listing under each outdoor model. If you do
not have access to this site, your distributor can
offer assistance.

10
4.0 INSTALLATION
4.3.3 Elevating Unit
WARNING: Secure an elevated unit and
its 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 at roof or on a slab,
observe the following guidelines.
If elevating a unit on a at 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.
Location
NOTICE: DO NOT block drain openings
on bottom of unit.
If unit must be elevated, secure unit and elevating
stand such that unit and/or stand will not tip over
or fall off. Keep in mind that someone may try to
climb on unit.
DO NOT BLOCK
OPENINGS
IN BASE PAN
BASE PAD
(CONCRETE OR OTHER SUITABLE
MATERIAL)
ST-A1226-03-00
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 lter 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 lter drier is mandatory.
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
4.4.2 Line Set Application
Considerations
The following are special considerations that need
to be addressed when selecting and installing a
line set.
• Additional refrigerant charge
• Fitting losses and maximum equivalent length
considerations
• Refrigerant migration during the off cycle
• Oil return to the compressor
• Capacity losses
• System oil level adjustment
4.4.2.1 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
suction 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 suction line instead of being returned to the
compressor crankcase. This is especially true for
long line lengths. Variable speed systems present
an additional challenge due to the fact that the system
operates at a signicantly reduced refrigerant
ow rate for a signicant percentage of operating
time. Only use the suction line sizes listed in Table 2
to assure proper oil return. DO NOT oversize suction
line!
4.4.2.2 Refrigerant Migration
During Off Cycle
Long line set applications can require a consider-
able 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. Off-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. Section 4.5.2 demonstrates
the required unit conguration for different
applications.
The outdoor unit controls can energize a portion of the
compressor motor stator during the off cycle as needed
to prevent liquid refrigerant from accumulating inside the
compressor, similar to how a crankcase heater functions
on a conventional system.

11
4.0 INSTALLATION
4.4.2.3 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 super-
heat. Be sure to account for vertical separation,
elbows, lter driers, solenoid valves, sight glasses,
and check valves when calculating liquid line pres-
sure drop.
4.4.2.4 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 expansion device which
will dramatically reduce the capacity and efciency
of the system. For this reason, the liquid line must
be sized properly using Table 2 and must be insulated
in unconditioned spaces.
4.4.2.5 Oil Level Adjustment for
Long Line Set Applications
Additional oil will need to be added if refrigerant is
added during installation. The following provides the
equation for the oil level adjustment and the compressor
name plate oil charge for the different outdoor units.
Tubing
Oil to be Added = [(Charge Adjustment + OD
Unit Name Plate Refrigerant Charge (oz.)) ×
(0.022) – [(0.10) × (Compressor Name Plate Oil
Charge (oz.))]
Example: An application requires 125ft of line set
with a liquid line diameter of 3/8”, Charge Adjustment =
66 oz., Name Plate Charge = 212 oz.,
Name Plate Oil Charge = 40 oz., Oil to be Added =
((66 oz. + 212 oz.) × .022) – (.10 × 40 oz.) = 2 oz.
OD Model
(-)A2024
(-)A2036
(-)A2048
(-)A2060
ZPV0212E-ZE9-130
ZPV0212E-ZE9-130
ZPV0342E-ZE9-130
ZPV038CE-2E9-130
Compressor Nameplate Oil
Charge (oz)
40
40
40
40
4.4.2.6 Capacity Losses
Long line lengths can result in a reduction in
capacity due to suction line pressure drop and heat
gain or loss. Refer to Table 2 for capacity loss
multipliers for various suction line diameters and
equipment line lengths. This table does not ac-
count for any capacity loss due to heat gain or loss
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 suction line diameter
and length, or, if a suction line diameter is not listed,
oil return will not be adequate.
4.4.3 Line Set Length and Fitting Losses
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
tubing length, ttings, vertical separation, accessories,
and lter driers. The table below references
different commonly used equivalent lengths.
Line Size
in [mm]
90 Short
Radius
Elbow
90 Long
Radius
Elbow
45
Elbow
Solenoid
Valve
Check
Valve
Sight
Glass
Filter
Drier
3/8 [9.53] 1.3 [0.40] 0.8 [0.24] 0.3 [0.09] 6 [1.83] 4 [1.22] 0.4 [0.12] 6 [1.83]
1/2 [12.71] 1.4 [0.43] 0.9 [0.27] 0.4 [0.12] 9 [2.74] 5 [1.52] 0.6 [0.18] 6 [1.83]
5/8 [15.88] 1.5 [0.46] 1 [0.30] 0.5 [0.15] 12 [3.66] 6 [1.83] 0.8 [0.24] 6 [1.83]
3/4 [19.05] 1.9 [0.58] 1.3 [0.40] 0.6 [0.18] 14 [4.27] 7 [2.13] 0.9 [0.27] 6 [1.83]
7/8 [22.23] 2.3 [0.70] 1.5 [0.46] 0.7 [0.21] 15 [4.57] 8 [2.44] 1 [0.30] 6 [1.83]
1-1/8 [28.58] 2.7 [0.82] 1.8 [0.55] 0.9 [0.27] 22 [6.71] 12 [3.66] 1.5 [0.46] 6 [1.83]
Equivalent Length for Fittings: ft [m]
Table 1

12
4.0 INSTALLATION
4.4.4 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 en-
tering the expansion device of the indoor coil or outdoor
unit. Flashing 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 outdoor
unit and indoor coil.
• Restricted liquid linear lter drier.
• Kinked liquid line.
The following Refrigerant Line Selection (Table 2)
lists the equivalent length per 25’ [8 m] of liquid line
at various diameters up to 150’ [46 m]. 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 be-
tween the outdoor unit and indoor coil.
• Measure the total indoor length of liquid line re-
quired.
• Add all of the equivalent lengths associated with any
ttings or accessories using Table 1.
• 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 sepa-
ration and diameter of liquid line.
Example: A 3-ton unit is installed 25’ below the indoor
unit, requires a 75’ of 1/2” diameter liquid line, 3/4” suc-
tion line, 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 25’
vertical rise is less than the maximum rise of 50’ for
this application.
Unit Size
Allowable
Liquid Line
Size
Allowable
Suction
Line
Size
Outdoor Unit ABOVE or BELOW Indoor Unit
Equivalent Length (Feet)
<25 26-50 51-75 76-100 101-125 126-150
Maximum Vertical Separation (Outdoor Unit Below Indoor Unit)* / Capacity Multiplier
3 Ton
5/16” 5/8” 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 36 / 0.91 NR
3/8” 5/8” 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
5/16” 3/4” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 36 / 0.91 20 / 0.96
3/8” 3/4” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
1/2” 3/4” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
(Excerpt from Table 2A)
4.4.5 Suction Line Selection
The purpose of the suction line is to return super-
heated vapor to the condensing unit from the
indoor coil. Proper suction line sizing is important be-
cause it plays an important role in returning oil to the
compressor to prevent potential damage to the bearings,
valves, and scroll sets. Also, an improperly sized suction
line can dramatically reduce capacity and performance
of the system. The procedure for selecting the proper
suction line is as follows:
• Determine the total linear length of suction line
required.
• Add all of the equivalent lengths associated with any
ttings or accessories using Table 1.
• Add the linear length and total tting equivalent
length. This will equal your total equivalent line
length.
• Reference Table 2 to verify that the calculated equiv-
alent length falls within the compatibility region of the
chart.
• Verify capacity loss is acceptable for the application.
Tubing

13
4.0 INSTALLATION
Table 2A: Refrigerant Line Sizing Chart (English Units)
Unit Size
Allowable
Liquid Line
Size
Allowable
Suction
Line
Size
Outdoor Unit ABOVE or BELOW Indoor Unit
Equivalent Length (Feet)
<25 26-50 51-75 76-100 101-125 126-150
Maximum Vertical Rise (Outdoor Unit Below Indoor Unit)* / Capacity Multiplier
2.0 Ton
*SEE
NOTE 3
1/4” 5/8” 25 / 1.00 50 / 0.99 32 / 0.98 4 / 0.97 NR NR
5/16” 5/8” 25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
3/8” 5/8” 25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
1/4” 3/4”** 25 / 1.00 50 / 1.00 32 / 0.99 4 / 0.99 NR NR
5/16” 3/4”** 25 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3/8” 3/4”** 25 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3 Ton
5/16” 5/8” 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 37 / 0.91 NR
3/8” 5/8” 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
5/16” 3/4” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 37 / 0.97 22 / 0.96
3/8” 3/4” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
1/2” 3/4” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
4 Ton
3/8” 3/4” 25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.94 50 / 0.93
1/2” 3/4” 25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.94 50 / 0.93
3/8” 7/8” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
1/2” 7/8” 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
5Ton
3/8” 3/4” 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
1/2” 3/4” 25 /0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
3/8” 7/8” 25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97 38 / 0.96
1/2” 7/8” 25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97 50 / 0.96
Notes:
1) DO NOT exceed 150 ft lineal line length.
2) *DO NOT exceed 50 ft vertical separation between indoor and outdoor units.
3) **3/4” suction line should only be used for 2 ton system if outdoor unit is below or at same level as indoor
unit to assure proper oil return.
4) Always use the smallest liquid line allowable to minimize refrigerant charge.
5) Applications shaded in light gray indicate capacity multipliers between 0.90 and 0.96, which are not
recommended, but are allowed.
6) Applications shared in dark gray are not recommended but to excessive, liquid or suction pressure drop.
20 SEER Variable Speed Air-Conditioners

14
4.0 INSTALLATION
Table 2A: Refrigerant Line Sizing Chart (English Units)
Unit Size
Allowable
Liquid Line
Size
mm [in.]
Allowable
Suction Line
Size
mm [in.]
Outdoor Unit ABOVE or BELOW Indoor Unit
Equivalent Length (Meters)
<8 8-15 16-23 24-30 31-38 39-46
Maximum Vertical Rise (Outdoor Unit Below Indoor Unit)* / Capacity Multiplier
7.0 KW
[2.0 Ton]
*SEE
NOTE 3
6.35 [1/4] 15.88 [5/8] 8 / 1.00 15 / 0.99 10 / 0.98 1 / 0.97 NR NR
7.94 [5/16] 15.88 [5/8] 8 / 1.00 15 / 0.99 15 / 0.98 15 / 0.97 15 / 0.96 15 / 0.95
9.53 [3/8] 15.88 [5/8] 8 / 1.00 15 / 0.99 15 / 0.98 15 / 0.97 15 / 0.96 15 / 0.95
6.35 [1/4] 19.05 [3/4]** 8 / 1.00 15 / 0.99 10 / 0.99 1 / 0.99 NR NR
7.94 [5/16] 19.05 [3/4]** 8 / 1.00 15 / 0.99 15 / 0.99 15 / 0.99 15 / 0.99 15 / 0.98
9.53 [3/8] 19.05 [3/4]** 8 / 1.00 15 / 0.99 15 / 0.99 15 / 0.99 15 / 0.99 15 / 0.98
10.6 KW
[3 Ton]
7.94 [5/16] 15.88 [5/8] 8 / 0.99 15 / 0.97 15 / 0.95 15 / 0.93 11 / 0.91 NR
9.53 [3/8] 15.88 [5/8] 8 / 0.99 15 / 0.97 15 / 0.95 15 / 0.93 15 / 0.91 NR
7.94 [5/16] 19.05 [3/4] 8 / 1.00 15 / 0.99 15 / 0.99 15 / 0.98 11 / 0.97 7 / 0.96
9.53 [3/8] 19.05 [3/4] 8 / 1.00 15 / 0.99 15 / 0.99 15 / 0.98 15 / 0.97 15 / 0.96
12.7 [1/2] 19.05 [3/4] 8 / 1.00 15 / 0.99 15 / 0.99 15 / 0.98 15 / 0.97 15 / 0.96
14.1 KW
[4 Ton]
9.53 [3/8] 19.05 [3/4] 8 / 0.99 15 / 0.98 15 / 0.97 15 / 0.96 15 / 0.94 15 / 0.93
12.7 [1/2] 19.05 [3/4] 8 / 0.99 15 / 0.98 15 / 0.97 15 / 0.96 15 / 0.94 15 / 0.93
9.53 [3/8] 22.23 [7/8] 8 / 1.00 15 / 0.99 15 / 0.99 15 / 0.98 15 / 0.98 15 / 0.97
12.7 [1/2] 22.23 [7/8] 8 / 1.00 15 / 0.99 15 / 0.99 15 / 0.98 15 / 0.98 15 / 0.97
17.6 KW
[5Ton]
9.53 [3/8] 19.05 [3/4] 8 / 0.99 15 / 0.97 15 / 0.95 15 / 0.93 15 / 0.91 NR
12.7 [1/2] 19.05 [3/4] 8 / 0.99 15 / 0.97 15 / 0.95 15 / 0.93 15 / 0.91 NR
9.53 [3/8] 22.23 [7/8] 8 / 1.00 15 / 0.99 15 / 0.98 15 / 0.98 15 / 0.97 12 / 0.96
12.7 [1/2] 22.23 [7/8] 8 / 1.00 15 / 0.99 15 / 0.97 15 / 0.98 15 / 0.97 15 / 0.96
Notes:
1) Do not exceed 46 meters lineal line length.
2) *Do not exceed 15 meters vertical separation between indoor and outdoor units.
3) **19.05mm [3/4in] vapor line should only be used for 2 ton system if outdoor unit is below or at same
level as indoor unit to assure proper oil return.
4) Always use the smallest liquid line allowable to minimize refrigerant charge.
5) Applications shaded in light gray indicate capacity multipliers between 0.90 and 0.96, which are not
recommended, but are allowed.
6) Applications shared in dark gray are not recommended but to excessive, liquid or suction pressure drop.
20 SEER Variable Speed Air-Conditioners

15
4.0 INSTALLATION
4.5 Line Set Installation
Tubing
• 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 suction line
to prevent kinking.
TEMPORARY
HANGER PERMANENT
HANGER
• Route the tubing using temporary hangers; then
straighten the tubing and install permanent hangers.
The tubing must be adequately supported.
• Blow out the liquid and suction lines with dry nitro-
gen before connecting to the outdoor unit and indoor
coil to remove debris that can plug the expansion
device.
ST-A1226-05-00
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 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 biow lter drier is included with all
R-410A heat pump 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
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.
• 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 tub-
ing should be protected by a housing to prevent
damage.

16
4.0 INSTALLATION
Tubing
4.5 Line Set Installation (cont.)
4.5.2 Relative Location of Indoor and Outdoor Units
4.5.2.1 Outdoor Unit Level or Near Level to Indoor Coil Line Set
ST-A1219-01-01
IDEALLY, LINE SET SLOPES AWAY
FROM OUTDOOR UNIT. VERIFY
SUB-COOLING PRIOR TO EXPANSION
DEVICE, INSULATED LIQUID LINE IN
UNCONDITIONED SPACE FOR
LONG LINE APPLICATIONS.
INSULATED SUCTION LINE FULL LENGTH
REFERENCE TABLE 2 FOR
MAXIMUM LENGTH LIMITATIONS
Figure 3
For applications with the outdoor unit and indoor unit on
the same level the following is required:
• Insulated liquid line in unconditioned space only
• Suction line should slope toward the indoor unit.
(Reference Figure 3)
• Follow the proper line sizing, maximum linear and
equivalent length, charging requirements, and oil
level adjustments spelled out in this document.
• Verify at least 5°F [2.8°C] sub-cooling at the indoor
unit prior to expansion device.

17
4.0 INSTALLATION
Tubing
4.5.2.2 Outdoor Unit Below Indoor Coil (Long Line Set Applications)
ST-A1219-02-01
REFERENCE TABLE 2 FOR
MAXIMUM LENGTH AND VERTICAL
SEPARATION LIMITATIONS
VERIFY LIQUID SUBCOOLING
PRIOR TO EXPANSION DEVICE
IN THE COOLING MODE.
INVERTED TRAP
EVEN WITH TOP
OF THE COIL
INSULATED SUCTION LINE FULL LENGTH
INSULATE LIQUID LINE
IN UNCONDITIONED
SPACE FOR LONG
LINE APPLICATIONS
Figure 4
For applications with the outdoor unit below the indoor
coil, the following is required:
• Inverted suction-line trap (Reference Figure 4).
• Insulated liquid line in unconditioned space only.
• Follow the proper line sizing, maximum linear and
equivalent length, maximum vertical separation,
charging requirements, and oil level adjustments
spelled out in this document.
• Measure pressure at the liquid line service valve and
prior to expansion device. Verify that the pressure
drop is not greater than 50 PSI [345 kPa].
• For elevations greater that 25’ [8 m] a lower subcool-
ing can be expected.
• Verify there is at least 5ºF [2.8ºC] of liquid subcool-
ing at the indoor coil prior to the expansion device.

18
4.0 INSTALLATION
4.5.2.3 Outdoor Unit Above Indoor Coil
Figure 5
For applications with the outdoor unit above the
indoor coil the following is required:
• Insulated liquid line in unconditioned space only.
• Follow the proper line sizing, maximum linear and
equivalent length, maximum vertical separation,
charging requirements, and oil level adjustments
spelled out in this document.
Tubing
INSULATED SUCTION LINE
FULL LENGTH
REFERENCE TABLE 2 FOR MAXIMUM
LENGTH AND VERTICAL
SEPARATION LIMITATIONS
INSULATED LIQUID LINE
IN UNCONDITIONED SPACE
FOR LONG LINES
APPLICATIONS

19
4.0 INSTALLATION
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.
• 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 ttings 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.
• 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 nitro-
gen, the nitrogen regulator should be turned off
to avoid pressuring the system.
• After 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.
Tubing

20
4.0 INSTALLATION
Tubing
4.6 Initial Leak testing
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.
The variable speed inverter driven condensing units
must be matched to indoor coils or air-handlers that
are equipped with EXVs. During shipment, vibration
has been found to move the EXV stem valve to a near
closed position despite being set to a fully open position
in the factory. Prior to leak testing it is recommended to
apply power to the indoor unit, making sure there is no
call for operation by disconnecting the EcoNet™ control
center or thermostat. By doing this, the controls will im-
mediately close the EXV followed immediately by open-
ing it to the wide open position, permitting free ow of
nitrogen through the system during the brazing process.
Indoor coils have only a holding charge of dry
nitrogen. Keep all tube ends sealed until connections are
to be made.
ST-A1226-07-00
• Pressurize line set and coil through service t-
tings with dry nitrogen to 150 PSIG (maximum).
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 nal leak testing).
ST-A1226-06-00
• The suction line must be insulated for its entire
length to prevent dripping (sweating) and prevent
performance losses. Closed-cell foam insulation
such as Armaex 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.
4.7 Evacuation
Evacuation is one of the most important parts of
the entire installation and service procedure. The
life and efciency 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 ttings.