Kinghome KD24UHI User manual

Owner's Manual
Original Instructions
Air Conditioners
Air Handlers
Models:
KD24UHI
KD30UHI
KD36UHI
KD42UHI
KD48UHI
KD60UHI

To Users
Thank you for selecting Gree 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:
(1) This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety. Children should be supervised
to ensure that they do not play with the appliance.
(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 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.
(5) If the product needs to be installed, moved or maintained, please contact our
designated dealer or local service center for professional support. Users should
not disassemble or maintain the unit by themselves, otherwise it may cause
relative damage, and our company will bear no responsibilities.
(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. If there is adjustment in the product, please subject to actual product.

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.

Contents
1 Safety Precautions ................................................................ 1
2 Product Introduction ............................................................. 3
2.1 Product Description.................................................................... 3
2.2 Operating Range........................................................................ 3
2.3 Optional Accessories.................................................................. 3
2.4 Physical Dimension.................................................................... 3
2.5 Names of Main Parts.................................................................. 4
2.6 General Information ................................................................... 4
2.7 Dip Switch Configuration............................................................ 5
2.8 Fan Performance Data............................................................... 6
3 Preparative for Installation.................................................. 10
3.1 Pre-Installation Instruction........................................................ 10
3.2 Important Safety Instructions.................................................... 10
4 Installation............................................................................ 12
4.1 Unit Inspection ......................................................................... 12
4.2 Location ................................................................................... 13
4.3 Piping Work.............................................................................. 14
4.4 Condensate Removal............................................................... 16
4.5 Ductwork.................................................................................. 16
4.6 Electric Heater ......................................................................... 17
4.7 Electrical Installation ................................................................ 19
5 Installation Check and Trial Run ........................................ 29
5.1 Checking Items after Installation .............................................. 29
5.2 Trial Run .................................................................................. 29
6 Common Malfunction and Elimination .............................. 30
7 Maintenance and Care......................................................... 32

7.1 Drain Pipe ................................................................................ 32
7.2 Notice before Seasonal Use..................................................... 32
7.3 Maintenance after Seasonal Use ............................................. 32
7.4 Parts Replacement................................................................... 32
8 After-Sales Service .............................................................. 33

Air Handlers
1
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.

Air Handlers
2
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.
PROPOSITION 65:
Respirable particles of fiberglass are known to State of California to cause cancer.
This appliance contains fiberglass insulation.
California Proposition 65 warnings are required for certain products, which are not
covered by the OSHA standards. All manufacturer products meet current federal OSHA
Guidelines for safety.
Products that contain or produce any of the more than 600 listed chemicals known
in California can cause cancer or birth defects, such as fiberglass insulation, lead in
brass and natural gas combustion products. Warnings are issued for such products
sold in California as required by California Proposition 65.
All “new equipment” shipped for sale in California will have labels stating that the
product contains and /or produces Proposition 65 chemicals. We cannot always know
“when, or if” products will be sold in the California market. Although we have not
changed our processes, having the same label on all our products facilitates
manufacturing and shipping.
All phases of this installation must conform to NATIONAL, STATE AND LOCAL
CODES. If it is required for additional information, please contact your local distributor.
The unit must be permanently grounded. Failure to do so can lead to electrical
shock causing personal injury or death.
The material of plenum and ductwork must meet the standard NFPA 90B.
The supply air plenum or duct must have a solid sheet metal bottom piece directly
after the air handler unit with no openings, registers or flexible air ducts located in it.

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The first 6 inches of supply air plenum and ductwork must be constructed of sheet
metal as required by NFPA 90B. Metal plenum of duct may be connected to the
non-combustible floor base for downflow. Exposing combustible non-metal. material to
the supply opening of a downflow unit can cause a fire resulting in property damage,
personal injury or death. If flexible supply air ducts are used they may be located only in
the side walls of the rectangular plenum, a minimum of 6 inches from the solid bottom.
2 Product Introduction
2.1 Product Description
The GREE 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.
2.2 Operating Range
— Cooling Heating
Indoor temperature 64.4°F(18°C)~89.6°F (32°C) 50°F (10°C)~80.6°F (27°C)
2.3 Optional Accessories
Indoor unit accessories
No. Name Appearance Q'ty Usage
1 Throw-over
pipe
1
Connect the unit
with the liquid
pipe
2.4 Physical Dimension

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Unit: inch(mm)
Model Dimension
W D H A B
18-1/8
(460)
21-1/4
(540)
43-1/2
(1105)
11-5/8
(295)
16-3/4
(426)
21-1/4
(540)
21-1/4
(540)
48-3/16
(1224)
11-5/8
(295)
20
(508)
24-13/16
(630)
21-1/4
(540)
52
(1320)
11-5/8
(295)
20
(508)
NOTE: The outdoor unit models that can be matched with the indoor unit can be found
on the AHRI website.
2.5 Names of Main Parts
2.6 General Information
Unit: mm
Model Filter size
420×516×15
420×516×15
490×516×15
490×516×15
525×516×15
525×516×15
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.
KD24UHI
KD30UHI
KD36UHI
KD42UHI
KD48UHI
KD60UHI
KD24UHI
KD30UHI
KD36UHI
KD42UHI
KD48UHI
KD60UHI

Air Handlers
5
2.7 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.
After the unit is shut down or stopped at the temperature point, the indoor unit will
delay for a few minutes and then shut down. The refrigeration can realize the drying
function, relieve the mold of the air duct, and the heating can blow the waste heat and
relieve the heat accumulation in the air duct.
During installation and debugging, pay attention to check whether the thermostat
has set the fan delay and shutdown time. If the thermostat has been set, the actual
delay and shutdown time of the fan is equal to the thermostat setting time plus the fan
delay time of the indoor unit.
Model Level Heat (SA2) Cool (SA1)
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
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
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
KD24UHI
KD30UHI
KD36UHI

Air Handlers
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Model Level Heat (SA2) Cool (SA1)
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
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 1 0 1 1 0 0 0 0
Level 5 1 1 0 0 0 0 0 0
Level 6-Default 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
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 0 0 1 1 0 0 0 0
Level 5 0 1 0 0 0 0 0 0
Level 6-Default 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.
2.8 Fan Performance Data
External static pressure should stay within the minimum and maximum limits
shown in the table below in order to ensure proper operation of both cooling and
heating operation.
Model
Level
Static pressure:Inches W.C.(Pa)
0
(0)
0.1
(25)
0.15
(37)
0.2
(50)
0.3
(75)
0.4
(100)
0.5
(125)
0.6
(150)
0.7
(175)
0.8
(200)
0.9
(225)
1
(250)
Speed
1(CFM) 1030 900 - - - - - - - - - -
Speed
2(CFM) 1080 960 900 - - - - - - - - -
KD42UHI
KD48UHI
KD60UHI
KD24UHI

Air Handlers
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Model
Level
Static pressure:Inches W.C.(Pa)
0
(0)
0.1
(25)
0.15
(37)
0.2
(50)
0.3
(75)
0.4
(100)
0.5
(125)
0.6
(150)
0.7
(175)
0.8
(200)
0.9
(225)
1
(250)
Speed
3(CFM) 1220 1120 1060 990 - - - - - - - -
Speed
4(CFM) 1380 1250 1120 1070 1020 920 - - - - - -
Speed
5(CFM) 1550 1490 1440 1390 1290 1180 1090 970 - - - -
Speed
6(CFM) 1620 1540 1500 1450 1400 1360 1250 1130 960 - - -
Speed
7(CFM) 1700 1630 1580 1530 1450 1400 1370 1270 1150 970 - -
Speed
8(CFM) 1750 1700 1650 1600 1590 1500 1420 1330 1200 1050 950 -
Model
Level
Static pressure:Inches W.C.(Pa)
0
(0)
0.1
(25)
0.15
(37)
0.2
(50)
0.3
(75)
0.4
(100)
0.5
(125)
0.6
(150)
0.7
(175)
0.8
(200)
0.9
(225)
1
(250)
Speed
1(CFM) 1110 980 - - - - - - - - - -
Speed
2(CFM) 1160 1040 980 - - - - - - - - -
Speed
3(CFM) 1300 1200 1140 1070 - - - - - - - -
Speed
4(CFM) 1460 1330 1200 1150 1100 1000 900 - - - - -
Speed
5(CFM) 1630 1570 1520 1470 1370 1260 1090 900 - - - -
Speed
6(CFM) 1700 1620 1580 1530 1480 1440 1330 1210 1040 920 - -
Speed
7(CFM) 1780 1710 1660 1610 1530 1480 1450 1350 1230 1130 960 -
Speed
8(CFM) 1800 1780 1730 1680 1670 1580 1500 1410 1280 1150 970 -
KD24UHI
KD30UHI

Air Handlers
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Model
Level
Static pressure:Inches W.C.(Pa)
0
(0)
0.1
(25)
0.15
(37)
0.2
(50)
0.3
(75)
0.4
(100)
0.5
(125)
0.6
(150)
0.7
(175)
0.8
(200)
0.9
(225)
1
(250)
Speed
1(CFM) 1050 950 - - - - - - - - - -
Speed
2(CFM) 1220 1120 1020 960 - - - - - - - -
Speed
3(CFM) 1380 1260 1200 1100 950 - - - - - - -
Speed
4(CFM) 1630 1580 1500 1430 1370 1200 1050 970 - - - -
Speed
5(CFM) 1710 1650 1600 1560 1480 1400 1250 1130 960 - - -
Speed
6(CFM) 1775 1725 1675 1635 1560 1495 1405 1315 1205 1040 - -
Speed
7(CFM) 1840 1800 1750 1710 1640 1590 1500 1420 1330 1220 1100 930
Speed
8(CFM) 1870 1830 1810 1800 1760 1690 1620 1520 1440 1350 1250 1150
Model
Level
Static pressure:Inches W.C.(Pa)
0
(0)
0.1
(25)
0.15
(37)
0.2
(50)
0.3
(75)
0.4
(100)
0.5
(125)
0.6
(150)
0.7
(175)
0.8
(200)
0.9
(225)
1
(250)
Speed
1(CFM) 1100 1000 - - - - - - - - - -
Speed
2(CFM) 1300 1200 1100 1010 - - - - - - - -
Speed
3(CFM) 1380 1260 1200 1100 950 - - - - - - -
Speed
4(CFM) 1710 1650 1600 1560 1480 1400 1230 1150 1080 - - -
Speed
5(CFM) 1775 1725 1675 1635 1560 1495 1405 1315 1205 1075 - -
Speed
6(CFM) 1840 1800 1750 1710 1640 1590 1500 1420 1330 1220 1080 900
Speed
7(CFM) 1870 1830 1810 1800 1760 1690 1620 1520 1440 1350 1250 1150
Speed
8(CFM) 1900 1860 1840 1830 1790 1720 1650 1550 1470 1380 1280 1180
KD36UHI
KD42UHI

Air Handlers
9
Model
Level
Static pressure:Inches W.C.(Pa)
0
(0)
0.1
(25)
0.15
(37)
0.2
(50)
0.3
(75)
0.4
(100)
0.5
(125)
0.6
(150)
0.7
(175)
0.8
(200)
0.9
(225)
1
(250)
Speed
1(CFM) 1640 1500 - - - - - - - - - -
Speed
2(CFM) 1680 1560 1500 - - - - - - - - -
Speed
3(CFM) 1810 1690 1620 1550 - - - - - - - -
Speed
4(CFM) 1930 1830 1770 1710 1580 1480 - - - - - -
Speed
5(CFM) 2200 2110 2040 1980 1860 1720 1620 1490 - - - -
Speed
6(CFM) 2240 2190 2145 2100 2010 1870 1750 1615 1500 - - -
Speed
7(CFM) 2280 2240 2200 2180 2130 2080 2000 1880 1750 1600 - -
Speed
8(CFM) 2300 2260 2220 2190 2140 2090 2040 1980 1930 1800 1700 1550
Model
Level
Static pressure:Inches W.C.(Pa)
0
(0)
0.1
(25)
0.15
(37)
0.2
(50)
0.3
(75)
0.4
(100)
0.5
(125)
0.6
(150)
0.7
(175)
0.8
(200)
0.9
(225)
1
(250)
Speed
1(CFM) 1660 1540 1470 - - - - - - - - -
Speed
2(CFM) 1850 1720 1650 1600 - - - - - - - -
Speed
3(CFM) 1920 1800 1730 1650 1480 - - - - - - -
Speed
4(CFM) 2110 2000 1950 1860 1760 1640 1500 - - - - -
Speed
5(CFM) 2250 2200 2190 2140 2040 1930 1800 1670 1520 - - -
Speed
6(CFM) 2260 2220 2200 2170 2090 2010 1910 1760 1650 1550 - -
Speed
7(CFM) 2300 2260 2230 2200 2150 2115 2050 1990 1920 1790 1650 1470
Speed
8(CFM) 2320 2280 2250 2230 2190 2140 2080 2040 2000 1950 1920 1890
NOTE: Please refer to above table for fan speed selection, and ‘-’ indicates that the
electric heater is not allowed to be used.
KD48UHI
KD60UHI

Air Handlers
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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
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.

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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
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.

Air Handlers
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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.
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.

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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,
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 air handler is designed for a complete supply and return ductwork system. Do
not operate this product without all ductwork attached. The supply duct must be longer
than 5 feet(1.524m).
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 2500mm. And the air handler is not accessible to the
general public. And the air handler should be maintained horizontal 5° angle to ensure
smooth drainage.

Air Handlers
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A B
4.3 Piping Work
4.3.1 Specification of Connection Pipe
Model External diameter (inch)
Gas pipe Liquid pipe
Φ3/4 Φ3/8
4.3.2 Piping Preparation
The gas pipe connection method adopts solder connection, the liquid pipe
connection method is screw connection.
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.
KD24UHI
KD30UHI
KD36UHI
KD42UHI
KD48UHI
KD60UHI

Air Handlers
15
First, wrap the rubber grommet with water saturated cloth, and then weld off the
cap closures from the gas pipes. Then weld the gas pipes with the connecting pipes.
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