Kinghome KD24UHO User manual

Owner's Manual
Original Instructions
Air Conditioners
DC Inverter U-match Series for R410A Unitary
Split Air Conditioner
Models:
Outdoor Unit
KD24UHO
KD30UHO
KD36UHO
KD42UHO
KD48UHO
KD60UHO

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 ......................................................... 4
2.1 Operating Range....................................................................4
2.2 Standard Accessories.............................................................4
2.3 Optional Accessories..............................................................5
3 Installation.......................................................................... 5
3.1 Installation Preparation ..........................................................5
3.2 Unit Installation ......................................................................9
3.3 Electrical Installation ............................................................17
3.4 Check after Installation.........................................................22
3.5 Test Running ........................................................................22
4 Maintenance..................................................................... 23
4.1 Failures Not Caused by Faults of the AC..............................23
4.2 Error Code ...........................................................................25
4.3 Unit Maintenance .................................................................27
4.4 Notice on Maintenance ........................................................28
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.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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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.
(1) The air conditioner should be grounded to avoid electric shock. Do not connect
the ground wire to gas pipe, water pipe, lightning arrester or telephone wire.
(2) The appliance shall be stored in a well-ventilated area where the room size
corresponds to the room area as specified for operation.
(3) The appliance shall be stored in a room without continuously operating open
flames (for example an operating gas appliance) and ignition sources (for
example an operating electric heater).
(4) According to federal/state/local laws and regulations, all packages and
transportation materials, including nails, metal or wooden parts, and plastic
packing material, must be treated in a safe way.
(1) Please install according to this instruction manual. Installation must be
performed in accordance with the requirement of NEC and CEC by authorized
personnel only.
(2) Any person who is involved with working on or breaking into a refrigerant circuit
should hold a current valid certificate from an industry-accredited assessment
authority, which authorises their competence to handle refrigerants safely in
accordance with an industry recognised assessment specification.
(3) Servicing shall only be performed as recommended by the equipment
manufacturer.
(4) The appliance shall be installed in accordance with national wiring regulations.
(5) The fixed wires connecting to the appliance must be configured with all-pole
disconnection device under voltage grade III according to wiring rules.
(6) Air conditioner should be stored with protective measures against mechanical
damage caused by accident.
(7) If the installation space for air conditioner pipe is too small, adopt a protective
measure to prevent the pipe from physical damage.
(8) During installation, use the specialized accessories and components, otherwise
water leakage, electric shock or fire hazard may occur.
(9) Please install the air conditioner in a secure place that can withstand the weight
of air conditioner. Insecure installation may cause the air conditioner falling
down and lead to injury.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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(10) Be sure to adopt independent power circuit. If the power cord is damaged, it
must be repaired by the manufacturer, service agent or other professional
agents.
(11) The air conditioner can be cleaned only after it is turned off and
power-disconnected, otherwise electric shock may occur.
(12) The air conditioner is not intended to be cleaned or maintained by children
without supervision.
(13) Do not alter the setting of pressure sensor or other protective devices. If the
protective devices are short-circuited or changed against rules, fire hazard or
even explosion may occur.
(14) Do not operate the air conditioner with wet hands. Do not wash or sprinkle
water on the air conditioner, otherwise malfunction or electric shock will occur.
(15) Do not dry the filter with naked flame or an air blower; otherwise the filter will be
out of shape.
(16) If the unit is to be installed in a small space, please adopt protective measures
to prevent the concentration of refrigerant from exceeding the allowable safety
limit; excessive refrigerant leakage may lead to explosion.
(17) When installing or re-installing the air conditioner, please keep the refrigerant
circuit away from substances other than the specified refrigerant, such as air.
Any presence of foreign substances will cause abnormal pressure change or
even explosion, resulting in injury.
(18) The heat pump and the furnace cannot turn on the heating function at the same
time, otherwise it will cause safety failure.
(1) Do not put a finger or other objects into the air inlet or return air grill.
(2) Please adopt safety protection measures before touching the refrigerant pipe;
otherwise your hands may be hurt.
(3) Please arrange the drain pipe according to the instruction manual.
(4) Never stop the air conditioner by directly cutting off the power.
(5) Please select the proper copper pipe according to the requirement for pipe
thickness.
(6) Never install the air conditioner in the following places:
a) Places with oil smoke or volatile liquid: plastic parts may deteriorate and fall
off or even cause water leakage.
b) Places with corrosive gas: copper pipe or the welding parts may be
corroded and cause refrigerant leakage.
(7) Adopt proper measures to protect the outdoor unit from small animals because
they may damage the electric components and cause malfunction of the air
conditioner.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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(1) If thermostat is to be used, it should be connected first before powering up the
unit, otherwise the thermostat may not be able to use.
(2) Only use soft dry cloth or slightly wet cloth with neutral detergent to clean the
casing of the air conditioner.
(3) Before operating the unit under low temperature, connect it to power for 8
hours. If it is stopped for a short time, for example, one night, do not cut off the
power (This is to protect the compressor).
(4) In order to ensure the reliability of the compressor, the unit force the
compressor run for at least 6 minutes every time the compressor turns on,
regardless of the room temperature. Therefore, it is necessary to select a
thermostat having the minimum run time for the compressor or delaying a few
minutes to turn the indoor unit off after the outdoor unit is shut down or stopped
at the temperature point, in order to avoid that the indoor unit is turned off by
the thermostat while the out unit is running which can result in the malfunction
of the air conditioner.
(5) In order to avoid the abnormality of the unit caused by the high temperature of
the pipe, it is forbidden to use gas auxiliary when the outdoor unit is turned on.
2 Product Introduction
2.1 Operating Range
—Cooling Heating
Outdoor
temperature 5°F(-15°C)~118.4°F (48°C) 5°F (-15°C)~75.2°F (24°C)
2.2 Standard Accessories
GUD24W2/D-D(U)
Outdoor unit accessories
No. Name Appearance Q'ty Usage
1 Drain plug 4 To plug the unused drain
hole
2 Drainage
connecter or 1 To connect with the hard
PVC drain pipe
GUD30W2/D-D(U),GUD36W2/D-D(U),GUD42W2/D-D(U),GUD48W2/D-D(U),GUD
60W2/D-D(U)
Outdoor unit accessories
No. Name Appearance Q'ty Usage
1 Drain plug 3 To plug the unused drain
hole
2 Drainage
connecter or 1 To connect with the hard
PVC drain pipe

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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2.3 Optional Accessories
Outdoor unit accessories
No. Name Appearance Q'ty Usage
1 Throw-over
pipe 1
Connect the
unit with the
liquid pipe
2 Throw-over
pipe
1
Connect the
unit with the
gas pipe
3 Installation
3.1 Installation Preparation
3.1.1 Selection of Installation Location
①.The unit must be installed where strong enough to withstand the weight of the
unit and fixed securely, otherwise the unit would topple or fall off.
②.Install the air conditioner at a place where the inclination is less than 5°.
③.Do not install where there is the danger of combustible gas leakage.
④.Do not install the unit at a place with leakage of inflammable gas.
Selection of installation location for outdoor unit (Select a location pursuant to
the following condition).
(1) Noise and air flow produced by the outdoor unit will not disturb the neighbors.
(2) Select a location that is safe and away from animals and plants. If not, please
add safety fences to protect the unit.
(3) Install at a place with good ventilation. Make sure the outdoor unit stays at a
well-ventilated place with no obstacles nearby that may obstruct the air inlet
and outlet.
(4) The installation location should be able to withstand the weight and vibration of
outdoor unit and allow the installation to be carried out safely.
(5) Avoid installing at a place with leakage of inflammable gas, oil smoke or
corrosive gas.
(6) Keep it away from strong wind because strong wind will affect the outdoor fan
and lead to insufficient air flow volume and thus affecting the unit’s

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
6
performance.
(7) Away from any object that may get the air conditioner generating noise.
(8) Install the outdoor unit at a place where condensate can be easily drained.
3.1.2 Unit Dimension
Unit: inch(mm)
Dimensions
Model
A B C D E F
35
(889)
15-13/16
(402)
25-7/8
(658)
22-7/16
(570)
14-9/16
(370)
13-3/8
(340)
36-5/16
(923)
16-13/16
(427)
29-3/8
(746)
24
(610)
15-9/16
(396)
14-9/16
(370)
37-1/8
(943)
16-13/16
(427)
32-1/2
(826)
25
(635)
15-9/16
(396)
14-9/16
(370)
39
(990)
16-13/16
(427)
37-13/16
(960)
29-3/4
(755)
15-9/16
(396)
14-9/16
(370)
NOTE: The indoor unit models that can be matched with the outdoor unit
can be found on the AHRI website.
3.1.3 Diagram of Unit Installation Space and Location
Diagram of installation space and location for outdoor unit (Notice: for best
performance of the outdoor unit, make sure its installation space conforms to the
following installation dimensions).
KD24UHO
KD30UHO
KD36UHO
KD42UHO
KD48UHO
KD60UHO

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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1) When one outdoor unit is to be installed.
A~E HbHdH (mm)
a b c d e
B — - ≥100 - - -
A,B,C, — ≥300 ≥100 ≥100 - -
B,E — - ≥100 - - ≥1000
A,B,C,E — ≥300 ≥150 ≥150 - ≥1000
D — - - - ≥1000 -
D,E — - - - ≥1000 ≥1000
B,D
Hb＜HdHd＞H - ≥100 - ≥1000 -
Hb＞HdHd＜H - ≥100 - ≥1000 -
B,D,E
Hb＜Hd
Hb≤1/2H - ≥250 - ≥2000 ≥1000
1/2H＜Hb≤H - ≥250 - ≥2000 ≥1000
Hb＞H Prohibited
Hb＞Hd
Hd≤1/2H - ≥100 - ≥2000 ≥1000
1/2H＜Hd≤H - ≥200 - ≥2000 ≥1000
Hd＞H Prohibited

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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2) When two or more outdoor units are to be installed side by side.
Unit: mm
A~E HbHdH (mm)
a b c d e
A,B,C — ≥300 ≥300 ≥1000 - -
A,B,C,E — ≥300 ≥300 ≥1000 - ≥1000
D — - - - ≥2000 -
D,E — - - - ≥2000 ≥1000
B,D
Hb＜HdHd＞H - ≥300 - ≥2000 -
Hb＞HdHd ≤ 1/2H - ≥250 - ≥2000 -
1/2H＜Hd ≤ H - ≥300 - ≥2500 -
B,D,E
Hb＜Hd
Hb ≤ 1/2H - ≥300 - ≥2000 ≥1000
1/2H＜Hb≤H - ≥300 - ≥2500 ≥1000
Hb＞H Prohibited
Hb＞Hd
Hd ≤ 1/2H - ≥250 - ≥2500 ≥1000
1/2H＜Hd ≤ H - ≥300 - ≥2500 ≥1000
Hd＞H Prohibited

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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3) When outdoor units are installed in rows.
Unit: mm
Hb H (mm)
Hb ≤ 1/2H b ≥ 250
1/2H＜Hb ≤ H b ≥ 300
Hb＞H Prohibited
3.2 Unit Installation
(1) The outdoor unit does not have a TXV (thermal expansion valve), please make
sure there is a throttling valve (which throttles the unit when it operates in
cooling mode and opens fully when it operates in heating mode) in the indoor
unit (air handler or A coil).
(2) For areas with frequent snowfall, please clean up the snow in time to avoid
covering unit.
The unit installed in areas expecting snow are suggested to be raised with
support frames
If possible, avoid locations that are likely to accumulate snow. if not possible, a
snow guard should be installed on the unit to prevent accumulation of snow on
the top of the unit.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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3.2.1 Outdoor Unit Installation
(1) If the outdoor unit is installed on a solid ground such as concrete, use M10
screw bolts and nuts to secure the unit and make sure the unit stands erect
and level.
(2) If it vibrates and causes noise, please add rubber cushion between the
outdoor unit and the installation base. In order to avoid the influence of
outdoor unit noise, the outdoor unit should be away from the bedroom,
window and other places.
(3) When the outdoor unit is in heating or defrosting, it needs to drain water.
When installing the drain pipe, plug the accompanied drainage connector to
the drainage hole on the chassis of the outdoor unit. Then connect a drain
hose to the drainage connector (If drainage connector is used, the outdoor
unit should be at least 10cm from the installation ground. See the following
figures).
(4) Do not install the air conditioner where water, ice or snow from overhang or
roof may damage or flood the unit.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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(5) Do not install the air conditioner in a corrosive environment, otherwise it
may shorten the life, or negatively affect the performance of the unit.
(6) Installation requirements in snowy areas:
a) Install the air conditioner on a stand which more than 20 in.(500mm)
higher than the expected snow fall to prevent it from being covered by snow.
b) Attach snow hood and snow guard, see the following figures.
c) Do not install the air conditioner at a place where a snowdrift is
generated.
d) Remove the air inlet grille to prevent snow from accumulating on it.
e) Plugs and drainage connector are not recommended.
3.2.2 Connection Pipe Installation
3.2.2.1 Installation Notice and Requirement on Connection Pipe
Installation method: Connect the connection pipes first to the unit. When
bending a connection pipe, be careful not to damage the pipe. Do not over-tighten
the screw nut, otherwise leakage will occur. Besides, the outside of connection pipe
should be added with a layer of insulating cotton to protect it from mechanical
damage during installation, maintenance and transportation.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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Item
Model
Size of fitting pipe(inch) Maximum
pipe
length
feet(m)
Biggest drop between
indoor and outdoor
units
feet(m)
Liquid pipe Gas pipe
Φ3/8 Φ3/4 98.4(30) 49.2(15)
Φ3/8 Φ3/4 164(50) 98.4(30)
Connection pipe should adopt water-proof insulating material. Its wall thickness
should be 0.5-1.0mm and the pipe wall should be able to withstand 6.0MPa. The
longer the connection pipe is the worse cooling and heating performance it has.
3.2.2.2 Pipe Flaring
(1) Cut the connection pipe with a pipe cutter.
(2) The mouth of connection pipe should face downward. Remove burrs with
the cut surface so that the chips do not enter the pipe.
(3) Remove the cut-off valve of outdoor unit and take out the flare nut from the
bag of indoor unit accessories. Then fit the flare nut on the pipe and use a
flaring tool to flare the mouth of connection pipe.
(4) Check whether the flaring part has cracked. (See the figure below).
(5) If you replace the outdoor unit, you need to welded an additional dry filter at
the gas pipe.
3.2.2.3 Pipe Bending
(1) The pipes are shaped by your hands. Be careful not to collapse them.
KD24UHO
KD30UHO
KD36UHO
KD42UHO
KD48UHO
KD60UHO

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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(2) Do not bend the pipes in an angle more than 90°.
(3) If the pipe is repeatedly bent or extended, it will become hard and difficult to
be bent or extended. So do not bend or extend the pipe for more than 3
times.
(4) When bending the pipe, do not bend it
excessively, otherwise it will get
broken. As shown beside, use a sharp
cutter to cut the heat insulating pipe
and bend it after the pipe is exposed.
After bending, place the heat
insulating pipe back on the pipeline
and fix it with adhesive tape.
3.2.2.4 Connection Pipe of the Units
①.Connect the pipe to the unit. Please follow the instructions stated in the figures
below. Use both spanner and torque wrench.
②.When connecting the tapered screw nut, first apply chilled machine oil on its
inner and outer surface and then screw it up for 3~4 circles.
③.Confirm the tightening torque by referring to the following table (If the screw
nut is over-twisted, it may be damaged and cause leakage).
④.Check whether gas leakage occurs to the connection pipe and then apply
thermal insulation, as shown below.
⑤.Wind sponge around the joint of gas pipe and heat insulation sheath of gas
collecting pipe.
⑥.Be sure to connect gas pipe after liquid pipe is connected.
⑦.Be sure to have insulation for gas pipe. Insulation for liquid pipe is optional.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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3.2.2.4.1 Screw Connection
Pipe diameter (inch) Tightening torque (N·m)
Ф1/4 15-30
Ф3/8 35-40
Ф1/2 45-50
Ф5/8 60-65
Ф3/4 70-75
Ф7/8 80-85
3.2.3 Connection Pipe Vacuum Pumping and Leak Detection
3.2.3.1 Vacuum Pumping
①Make sure the outlet of vacuum pump is away from fire source and is
well-ventilated.
②Before vacuum pumping, make sure the unit cut-off valves are closed.
(1) Remove the caps of the liquid valve, gas valve and also the service port.
(2) Connect the hoses at the low pressure and high pressure sides of the
manifold valve assembly to the service ports of the unit’s gas valve and
liquid valve, and meanwhile the gas and liquid valves should be kept closed
in case of refrigerant leak.
(3) Connect the hose used for evacuation to the vacuum pump.
(4) Open the switch at the lower pressure side of the manifold valve assembly
and start the vacuum pump. Meanwhile, the switch at the high pressure side
of the manifold valve assembly should be kept closed, otherwise evacuation
would fail.
(5) The evacuation duration depends on the unit’s capacity, generally.

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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Model Time(min)
30
45
And verify if the pressure gauge at the low pressure side of the manifold valve
assembly reads -0.1MPa, if not, it indicates there is leak somewhere. Then, close
the switch fully and then stop the vacuum pump.
(6) Wait for 10min to see if the system pressure can remain unchanged. During
this time, the reading of the pressure gauge at the low pressure side can not
be larger than 0.005MPa.
(7) Slightly open the liquid valve and let some refrigerant go to the connection
pipe to balance the pressure inside and outside of the connection pipe, so
that air will not come into the connection pipe when removing the hose.
Note that the gas and liquid valve can be opened fully only after the
manifold valve assembly is removed.
(8) Place back the caps of the liquid valve, gas valve and also the service port.
For large-size units, there are maintenance ports for liquid valve and gas valve.
During evacuation, you may connect the two hoses of the branch valve assembly to
the maintenance ports to speed up the evacuation.
KD24UHO
KD30UHO
KD36UHO
KD42UHO
KD48UHO
KD60UHO

DC Inverter U-match Series for R410A Unitary Split Air Conditioner
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3.2.4 Refrigerant Adding
See the following table for the amount of additional refrigerant.
Item
Model
Standard pipe
length
Unnecessary
charge pipe
length
Additional refrigerant
amount for extra pipe
7.5m ≤9.5m 10g/m
7.5m ≤9.5m 30g/m
3.2.5 Installation of Drain Pipe
3.2.5.1 Outdoor Side Drainage Pipe
(1) If the outdoor unit is underneath the indoor unit, arrange the pipeline
according to the following diagram.
1) Drain hose should be placed on the ground and its end should not be
immersed into water. The whole pipeline should be supported and fixed
onto the wall.
2) Wind the insulating tape from bottom to top.
3) The whole pipeline should be wound with insulating tape and fixed onto
the wall with saddles.
KD24UHO
KD30UHO
KD36UHO
KD42UHO
KD48UHO
KD60UHO