Lennox AUD24AH2/A-D(U) User manual

Installation Instructions
Original Instructions
Air Conditioners
Air Handlers
Models:
AUD24AH2/A-D(U)
AUD36AH2/A-D(U)
AUD48AH2/A-D(U)
AUD60AH2/A-D(U)

To Users
(1) This appliance can be used by children aged from 8 years and above and persons
with reduced physical, sensory or mental capabilities or lack of experience and
knowledge if they have been given supervision or instruction concerning use of
the appliance in a safe way and understand the hazards involved. Children shall
not play with the appliance. Cleaning and user maintenance shall not be made by
children without supervision.
(2) In order to ensure reliability of product, the product may consume some power
under stand-by status for maintaining normal communication of system and
preheating refrigerant and lubricant. If the product is not to be used for long, cut off
the power supply; please energize and preheat the unit in advance before reusing
it.
(3) Please properly select the model according to actual using environment;
otherwise it may impact the using convenience.
(4) This product has gone through strict inspection and operational test before leaving
the factory. In order to avoid damage due to improper disassembly and inspection,
which may impact the normal operation of unit, please do not disassemble the unit
by yourself. You can contact with the special maintenance center of our company
if necessary.
(5) When the product is faulted and cannot be operated, please contact with our
maintenance center as soon as possible by providing the following information.
1)Contents of nameplate of product (model, cooling/heating capacity, product No.,
ex-factory date).
2)Malfunction status (specify the situations before and after the error occurs).
(6) All the illustrations and information in the instruction manual are only for reference.
In order to make the product better, we will continuously conduct improvement
and innovation. We have the right to make necessary revision to the product from
time to time due to the reason of sales or production, and reserve the right to
revise the contents without further notice.
Thank you for selecting AC PRO’s product. Please read this instruction manual
carefully before installing and using the product, so as to master and correctly use the
product. In order to guide you to correctly install and use our product and achieve
expected operating effect, we hereby instruct as below:

(7) If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is
caused by the following reasons:
(1) Damage the product due to improper use or misuse of the product.
(2) Alter, change, maintain or use the product with other equipment without abiding by
the instruction manual of manufacturer.
(3) After verification, the defect of product is directly caused by corrosive gas.
(4) After verification, defects are due to improper operation during transportation of
product.
(5) Operate, repair, maintain the unit without abiding by instruction manual or related
regulations.
(6) After verification, the problem or dispute is caused by the quality specification or
performance of parts and components that produced by other manufacturers.
(7) The damage is caused by natural calamities, bad using environment or force
majeure.
(8) AC PRO assumes no responsibility for personal
injury, property loss or equipment damage caused by improper installation and
commissioning, unnecessary maintenance, or not following relevant national rules
and regulations, industrial standards and requirements in this instruction manual.
(9) The final right to interpret for this instruction manual belongs to AC PRO.

Contents
1 Safety Precautions ............................................................ 1
2 Product Introduction ......................................................... 2
2.1 Product Description................................................................2
2.2 Optional Accessories..............................................................2
2.3 Physical Dimension................................................................3
2.4 Names of Main Parts..............................................................4
2.5 General Information ...............................................................4
2.6 Dip switch configuration .........................................................5
2.7 Fan Performance Data ........................................................6
3 Preparative for Installation................................................ 7
3.1 Pre-Installation Instruction......................................................7
3.2 Important Safety Instructions..................................................8
4 Installation........................................................................ 10
4.1 Unit Inspection .....................................................................10
4.2 Location ...............................................................................10
4.3 Piping Work..........................................................................11
4.4 Condensate Removal...........................................................13
4.5 Ductwork..............................................................................14
4.6 Electric Heater .....................................................................14
4.7 Electrical Installation ............................................................16
5 Installation Check and Trial Run .................................... 21
5.1 Checking Items after Installation ..........................................21
5.2 Trial Run ..............................................................................22
6 Common Malfunction and Elimination .......................... 23
7 Maintenance and Care..................................................... 25
7.1 Drain Pipe ............................................................................25

7.2 Notice before Seasonal Use.................................................25
7.3 Maintenance after Seasonal Use .........................................25
7.4 Parts Replacement...............................................................25
8 After-Sales Service .......................................................... 25
This marking indicates that this product should not be disposed with other household
wastes throughout the EU. To prevent possible harm to the environment or
human health from uncontrolled waste disposal, recycle it responsibly to
promote the sustainable reuse of material resources. To return your used
device, please use the return and collection systems or contact the retailer
where the product was purchased. They can take this product for
environmental safe recycling.

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1 Safety Precautions
This product can’t be installed at corrosive, inflammable or explosive environment
or the place with special requirements, such as kitchen. Otherwise, it will affect the
normal operation or shorten the service life of the unit, or even cause fire hazard or
serious injury. As for above special places, please adopt special air conditioner with
anti-corrosive or anti-explosion function.
Improper installation, adjustment, alteration, service, maintenance, or use can
cause explosion, fire, electrical shock, or other conditions which may cause death,
personal injury, or property damage. Consult a qualified installer, service agency, or
your distributor or branch for information or assistance. The qualified installer or agency
must use factory--authorized kits or accessories when modifying this product. Refer to
the individual instructions packaged with the kits or accessories when installing. Follow
all safety codes. Wear safety glasses, protective clothing, and work gloves. Use
quenching cloth for brazing operations. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions included in literature and
attached to the unit. Consult local building codes and National Electrical Code (NEC)
for special requirements. Recognize safety information. This is the safety--alert
symbol .
When you see this symbol on the unit and in instructions or manuals, be alert to the
potential for personal injury. Understand these signal words: DANGER, WARNING,
CAUTION and NOTICE. These words are used with the safety--alert symbol.
Indicates a hazardous situation that, if not avoided, will result in
death or serious injury.
Indicates a hazardous situation that, if not avoided, could result
in death or serious injury.
Indicates a hazardous situation that, if not avoided, may result
in minor or moderate injury.
Indicates important but not hazard-related information, used to
indicate risk of property damage.

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Electrical shock hazard:
Failure to follow this warning could result in personal injury or death.
Before installing, modifying, or servicing system, main electrical disconnect switch
must be in the OFF position. There may be more than 1 disconnect switch. Lock out
and tag switch with a suitable warning label.
2 Product Introduction
2.1 Product Description
2.2 Optional Accessories
Indoor unit accessories
No.
Name
Appearance
Q'ty
Usage
1 3/8 CPC 1
Copper Pipe
Connector
Liquid Line
2 3/4 CPC 1
Copper Pipe
Connector Gas
Line
The AC PRO air handler offer the perfect combination of superior product quality,
operating efficiency, operating sound levels and value for money. The condensing unit
uses the environmentally friendly refrigerant R410A, which is chlorine-free to help
prevent damage to the ozone layer.

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2.3 Physical Dimension
Unit: inch
Model
Dimension
W
D
H
A
B
$UD24AH2/A-D(U)
AUD36AH2/A-D(U) 21-1/4 21-1/4 48-1/4 11-5/8 20
AUD48AH2/A-D(U)
AUD60AH2/A-D(U) 24-3/4 21-1/4 57 11-5/8 20
Clearance
Side and back 0”
Front 24” for servicing.

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2.4 Names of Main Parts
2.5 General Information
Model
Cooling capacity(ton)
Optional electric heater (kW)
AUD24AH2/A-D(U)
2.0
5/8/10
AUD36AH2/A-D(U)
3.0
5/8/10
AUD48AH2/A-D(U)
4.0
10/15/20
AUD60AH2/A-D(U)
5.0
10/15/20
Model Motor @ 230V ~, 60Hz
HP
FLA
AUD24AH2/A-D(U)
AUD36AH2/A-D(U) 1/2 2.1
AUD48AH2/A-D(U)
AUD60AH2/A-D(U) 1 3.2
Unit: inch
Model
Filter size
AUD24AH2/A-D(U)
AUD36AH2/A-D(U) 19.29×20.31×.59
AUD48AH2/A-D(U)
AUD60AH2/A-D(U) 20.6×20.31×.59

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NOTES:
①.Based upon W/nominal tonnage, dry coil and filter should be installed.
②.Use 0.96 as approximate SCFM correction factor for wet coil.
2.6 Dip switch configuration
Set the indoor fan speed through the eight dip switches of the indoor main control
board. The higher level, the higher speed of the indoor unit fan. Operation Instruction is
below:
Dip switch settings must be completed before power on the unit.
Model Level Heat (SA2) Cool (SA1)
AUD24AH2/A-D(U)
Level 1
1
0
0
0
0
0
0
0
Level 2
1
0
0
1
0
0
0
0
Level 3
1
0
1
0
0
0
0
0
Level 4-Default
1
0
1
1
0
0
0
0
Level 5 1 1 0 0 0 0 0 0
Level 6 1 1 0 1 0 0 0 0
Level 7 1 1 1 0 0 0 0 0
Level 8
1
1
1
1
0
0
0
0
AUD36AH2/A-D(U)
Level 1
0
0
0
0
0
0
0
0
Level 2 0 0 0 1 0 0 0 0
Level 3 0 0 1 0 0 0 0 0
Level 4-Default 0 0 1 1 0 0 0 0
Level 5
0
1
0
0
0
0
0
0
Level 6
0
1
0
1
0
0
0
0
Level 7 0 1 1 0 0 0 0 0
Level 8 0 1 1 1 0 0 0 0
AUD48AH2/A-D(U)
Level 1 1 0 0 0 0 0 0 0
Level 2
1
0
0
1
0
0
0
0
Level 3
1
0
1
0
0
0
0
0
Level 4-Default 1 0 1 1 0 0 0 0
Level 5 1 1 0 0 0 0 0 0
Level 6 1 1 0 1 0 0 0 0
Level 7
1
1
1
0
0
0
0
0
Level 8
1
1
1
1
0
0
0
0

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Model Level Heat (SA2) Cool (SA1)
AUD60AH2/A-D(U)
Level 1
0
0
0
0
0
0
0
0
Level 2
0
0
0
1
0
0
0
0
Level 3
0
0
1
0
0
0
0
0
Level 4-Default 0 0 1 1 0 0 0 0
Level 5 0 1 0 0 0 0 0 0
Level 6
0
1
0
1
0
0
0
0
Level 7
0
1
1
0
0
0
0
0
Level 8
0
1
1
1
0
0
0
0
NOTE: 0 means dip switch to ‘on’, 1 means dip switch to number.
2.7 Fan Performance Data
Model
AUD24AH2/A-D(U)
Level
Static pressure(Inches W.C.)
0
0.1
0.15
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Speed 1(CFM)
1030
900
840
-
-
-
-
-
-
-
-
-
Speed 2(CFM)
1080
960
900
840
-
-
-
-
-
-
-
-
Speed 3(CFM)
1220
1120
1060
990
850
-
-
-
-
-
-
-
Speed 4(CFM)
1390
1290
1240
1180
1070
960
-
-
-
-
-
-
Speed 5(CFM)
1580
1490
1440
1390
1290
1180
1090
970
830
-
-
-
Speed 6(CFM)
1720
1640
1600
1550
1450
1360
1250
1130
960
-
-
-
Speed 7(CFM)
1800
1730
1680
1630
1550
1460
1370
1270
1150
970
830
Speed 8(CFM)
1850
1820
1790
1740
1660
1580
1500
1410
1340
1200
1080
930
Model
AUD36AH2/A-D(U)
Level
Static pressure(Inches W.C.)
0
0.1
0.15
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Speed 1(CFM)
1150
1050
950
880
-
-
-
-
-
-
-
-
Speed 2(CFM)
1200
1100
1000
940
850
-
-
-
-
-
-
-
Speed 3(CFM)
1380
1260
1200
1100
950
-
-
-
-
-
-
-
Speed 4(CFM)
1550
1460
1390
1310
1160
1010
830
-
-
-
-
-
Speed 5(CFM)
1710
1650
1600
1560
1480
1400
1310
1210
1080
930
-
-
Speed 6(CFM)
1840
1800
1750
1710
1640
1590
1500
1420
1330
1220
1100
960
Speed 7(CFM)
1870
1830
1810
1800
1760
1690
1620
1520
1440
1350
1250
1150
Speed 8(CFM)
1900
1860
1840
1830
1790
1720
1660
1600
1540
1440
1320
1220

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NOTE: Please refer to above table for fan speed selection, and ‘-’ is not allowed to be
used.
3 Preparative for Installation
3.1 Pre-Installation Instruction
3.1.1 Checking Product Received
After receiving the product, please check if there is any damage caused by
transportation. Shipping damage is the responsibility of the carrier. Verify the model
number, specifications and accessories are correct prior to installation. The distributor
or manufacturer will not accept claims from dealers for transportation damage or
installation of incorrectly shipped units.
3.1.2 Before Installation
Carefully read all instructions for the installation prior to installing product. Make
sure each step or procedure is understood and any special considerations are taken
into account before starting installation. Assemble all tools, hardware and supplies
Model
AUD48AH2/A-D(U)
Level
Static pressure(Inches W.C.)
0
0.1
0.15
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Speed 1(CFM)
1640
1500
1450
1350
-
-
-
-
-
-
-
-
Speed 2(CFM)
1680
1560
1500
1380
1300
-
-
-
-
-
-
-
Speed 3(CFM)
1810
1690
1620
1550
1380
-
-
-
-
-
-
-
Speed 4(CFM)
1930
1830
1770
1710
1580
1430
1280
-
-
-
-
-
Speed 5(CFM)
2200
2110
2040
1980
1860
1720
1620
1490
1380
-
-
-
Speed 6(CFM)
2240
2190
2145
2100
2010
1870
1750
1615
1500
1380
-
-
Speed 7(CFM)
2280
2240
2200
2180
2130
2080
2000
1880
1750
1600
1420
Speed 8(CFM)
2300
2260
2220
2190
2140
2090
2040
1980
1930
1800
1700
1550
Model
AUD60AH2/A-D(U)
Level
Static pressure(Inches W.C.)
0
0.1
0.15
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Speed 1(CFM)
1660
1540
1470
1400
-
-
-
-
-
-
-
-
Speed 2(CFM)
1850
1720
1650
1600
1400
-
-
-
-
-
-
-
Speed 3(CFM)
1920
1800
1730
1650
1480
1315
-
-
-
-
-
-
Speed 4(CFM)
2110
2000
1950
1860
1760
1640
1490
1325
-
-
-
-
Speed 5(CFM)
2250
2200
2190
2140
2040
1930
1800
1670
1520
1370
-
-
Speed 6(CFM)
2260
2220
2200
2170
2090
2010
1910
1760
1650
1550
1430
1380
Speed 7(CFM)
2300
2260
2230
2200
2150
2115
2050
1990
1920
1840
1750
1660
Speed 8(CFM)
2320
2280
2250
2230
2190
2140
2080
2040
2000
1950
1920
1890

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needed to complete the installation. Some items may need to be purchased locally.
Make sure everything needed to install the product is on hand before starting.
3.1.3 Codes & Regulations
This product is designed and manufactured to comply with national codes. It is
installer’s responsibilities to install the product in accordance with such codes and/or
any prevailing local codes/regulations. The manufacturer assumes no responsibilities
for equipment installed in violation of any codes or regulations.
3.1.4 Replacement Parts
When reporting shortages or damages, or ordering repair parts, give the complete
product model and serial numbers as stamped on the product. Replacement parts for
this product are available through your contractor or local distributor.
3.2 Important Safety Instructions
Recognize safety symbols, words, and labels
The following symbols and labels are used throughout this manual to indicate
immediate or potential hazards. It is the owner’s responsibility to read and comply with
all safety information and instructions accompanying these symbols. Failure to heed
safety information increases the risk of serious personal injury or death, property
damage and/or product damage.
Immediate hazards which will result in property damage, product
damage, severe personal injury or death.
Hazards or unsafe practices could result in property damage,
product damage, severe personal injury or death.
Hazards or unsafe practices which may result in property damage,
product damage, severe personal injury or death.
Before serving or installing this equipment. The electrical power to
this unit must be in the “off” position. Caution, more than one disconnect may exist.
Failure to observe this warning may result in an electrical shock that can cause
personal injury or death.
The United States Environmental Protection Agency (“EPA”) has issued various
regulations regarding the introduction and disposal of refrigerants introduced into this

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unit. Failure to follow these regulations may harm the environment and can lead to the
imposition of substantial fines. These regulations may vary due to the passage of laws.
A certified technician must perform the installation and service of this product. Should
questions arise, contact your local EPA office.
Due to high system pressure and electrical shock in potential, installation and
service work can be dangerous. Only trained and qualified persons are permitted to
install or service this equipment. Observe all warnings contained in this manual and
labels/tags attached to the equipment.
This product is factory shipped for use with a 208/230V-1Ph-60Hz electrical power
supply. This air handler must not be reconfigured to operate with any other power
supply.
The unit must have an uninterrupted, unbroken electric grounding to minimize the
possibility of personal injury if an electric fault occurs. The electric grounding circuit may
consist of an appropriate sized power cord which connected with the grounding piece
located in the unit control box and also connecting to the building electric service panel.
Other methods of grounding are permitted if performed in accordance with the “National
Electric Code” (NEC)/ “American National Standards Institute” (ANSI)/ “National Fire
Protection Association” (NFPA) 70 and local/state codes. In Canada, electric grounding
conforms to the Canadian electric code CSA c22.1. Failure to observe this warning can
result in electrical shock that can cause personal injury.
Special warning for installation of furnaces or air handling units in enclosed areas,
such as garages, utility rooms or parking areas.

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Carbon monoxide producing devices (such as an automobile, space heater, gas
water heater, etc.) should not be operated in enclosed areas such as unventilated
garages, utility rooms or parking areas because of the danger of carbon monoxide (CO)
poisoning resulting from the exhaust emissions. If a furnace or air handler is installed in
an enclosed area such as a garage, utility room or parking area and a carbon monoxide
producing device is operated therein, there must be adequate ventilation directly to
outside.
This ventilation is necessary to avoid the danger of CO poisoning which can occur
if a carbon monoxide producing device continues to operate in the enclosed area.
Carbon monoxide emission can be (re)circulated throughout the building if the furnace
or air handler is operating in any mode.
CO can cause serious illness including permanent brain damage or death.
4 Installation
4.1 Unit Inspection
Upon delivery, inspect the unit for damage. Any damage must be reported
immediately to the carrier. Do not install such an equipment damaged by freight which
determines the integrity and safety of the unit.
Please check the equipment model number to ensure the unit is appropriately
sized for the condensing unit.
If an incorrect unit is supplied, it must not be installed and it is to be returned to the
supplier. The manufacturer assumes no responsibility for the installation of incorrectly
delivered units. The evaporator coil contains high-pressure inert gas for holding charge.
4.2 Location
This air handler is designed for indoor installation only. Do not install
it outdoors.
When installing the air handler, take consideration to minimize the length of
refrigerant tubing as much as possible. Do not install the air handler in a location either
above or below the condenser that violates the instructions provided with the condenser.
Service clearance is to take precedence. Allow a minimum of 24” in front of the unit for
service clearance. When installing in an area directly over a finished ceiling (such as an
attic), an emergency drain pan is required directly under the unit. See local and state
codes for requirements. When installing this unit in an area that may become wet,

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elevate the unit with a sturdy, non-porous material. In installations that may lead to
physical damage (i.e. a garage) it is advised to install a protective barrier to prevent
such damage.
This airhandler isdesigned for a complete supply and return ductwork system. Do
not operate this product without allductwork attached.
Based upon the actual conditions, if air handler is installed as Fig. A, the air
handler should be concealed in a specific room or space and make sure the air handler
is not accessible to the general public.
Based upon the actual conditions, if air handler is installed as Fig. B, make
sure that there is enough space for care and maintenance and the height between
the air handler and ground is above 8.2ft. And the air handler is not accessible to
the general public.
A B
4.3 Piping Work
4.3.1 Specification of Connection Pipe
Model
External diameter (inch)
Gas pipe
Liquid pipe
AUD24AH2/A-D(U)
AUD36AH2/A-D(U)
AUD48AH2/A-D(U)
AUD60AH2/A-D(U)
Φ3/4 Φ3/8

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4.3.2 Piping Preparation
4.3.2.1 Solder Connection
All cut ends are to be round, burr free, and cleaned. Failure to follow this practice
increases the chances for refrigerant leakage.

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4.3.2.2 Screw Connection
Pipe diameter (inch)
Tightening torque (N·m)
Φ1/4
15-30
Φ3/8
35-40
Φ1/2
45-50
Φ5/8
60-65
Φ3/4
70-75
Φ7/8
80-85
4.4 Condensate Removal
(1) It is not allowed to connect the condensate drain pipe into waste pipe or other
pipelines which are likely to produce corrosive or peculiar smell to prevent the
smell from entering indoors or corrupt the unit.
(2) It is not allowed to connect the condensate drain pipe into rain pipe to prevent rain
water from pouring in and cause property loss or personal injury.
(3) Condensate drain pipe should be connected into special drain system for air
conditioner.
(4) The drain pan has primary and secondary drain connection. Condensate removal
is performed by attaching a 3/4” PVC pipe to the evaporator coil pan and
terminated in accordance with local or state Plumbing/HVAC codes. The
installation must include a “P” style trap that is located closely to the evaporator
coil. Do not over-tighten the drain connection in order to prevent possible damage
to the evaporator drain pan. See the following figure for details of a typical
condensate line “P” trap.

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4.5 Ductwork
This air handler is designed for a complete supply and return ductwork system.
Do not operate the unit without all ductwork completed.
Do not operate this product without all ductwork attached.
Inadequate ductwork that restricts airflow can result in improper performance and
compressor or heater failure. Ductwork is to be constructed in a manner that limits
restrictions and maintains suitable air velocity. Ductwork is to be sealed to the unit in a
manner that will prevent leakage.
Return ductwork: Do not terminate the return ductwork in an area that can
introduce toxic or objectionable fumes/odors into the ductwork. The return ductwork is
to be introduced into the air handler bottom (up flow configuration).
Return Air Filters: Each installation must include a return air filter. This filtering may
be performed at the air handler or externally such as a return air filter grille.
4.6 Electric Heater
The air handlers listed in this manual do not have factory installed electric heat.
Electric heat is available as an accessory. Please refer to installation instructions
provided with heater kit for the correct installation procedure.
Refer to the “Electric heater kits installation” section of this manual
and the instructions provided with the heater kit for the correct installation procedure.
The electrical characteristics of the air handler, the electric heater kit,
and the supply power should be identical. This air handler does not have factory
installed electric heater. Electric heater is available as an accessory. If installing this
option, the only heater kits that can be used are the series as indicated below. It is
forbidden to use the electric heater other than those recommended.
When the electric heating is on, the fan of the air handler must be
on.