Gree GKH24S3GI User manual

Owner's Manual
Air Conditioners
Indoor unit Outdoor unit
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before operation
and retain it for future reference.If you have lost the Owner’s Manual, please contact the local agent or
visit www.gree.com or sent email to [e-mail] or electronic version.
GREE reserves the right to interpret this manual which will be subject to any change due to product
improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the final right to interpret this manual.
GKH24S3GI
GUHD24NS3GO
GKH36S3GI
GUHD36NS3GO
GKH42S3GI
GUHD42NS3GO
GKH48S3GI
GUHD48NS3GO
DC Inverter U-match Series
Cassette Type Unit

Preface
For correct installation and operation, please read all instructions carefully. Before
reading the instructions, please be aware of the following items:
(1) For the safe operation of this unit, please read and follow the instructions
carefully.
(2) During operation, total capacity of indoor units should not exceed the total
capacity of outdoor units. Otherwise, poor effect of cooling or heating may
result.
(3) Direct operators or maintainers should well keep this manual.
(4) If this unit fails to operate normally, please contact our service center as soon
as possible and provide the following information:
Content on the nameplate (model number, cooling capacity, production code,
ex-factory date).
Malfunction details (before and after the malfunction occurs).
(5) Each unit has been strictly tested and proved to be qualified before ex-factory.
In order to prevent units from being damaged or operating normally because of
improper disassembly, please do not disassemble the unit by yourself. If you
need to disassemble and check units, please contact our service center. We
will send specialists to guide the disassembly.
(6) All graphics in this manual is only for your reference. For sales or production
reasons, these graphics are subject to change by manufacturer without prior
notice.

Contents
1 Safety Precautions...................................................................................1
2 Outline of the Unit and Main Parts...........................................................3
3 Preparative for Installation .......................................................................4
3.1 Standard Accessory Parts.......................................................................4
3.2 Selection of the Installation Location ......................................................5
3.3 Connection Pipe Requirement................................................................7
3.4 Electrical Requirement............................................................................8
4 Installation of the Unit...............................................................................9
4.1 Installation of the Indoor Unit ..................................................................9
4.2 Installation of the Outdoor Unit ............................................................. 11
4.3 Installation of the Connection Pipe .......................................................13
4.4 Vacuum and Gas Leakage Inspection..................................................18
4.5 Installation of the Drain Hose................................................................20
4.6 The Panel Installation............................................................................24
4.7 Electrical Wiring ....................................................................................26
5 Installation of Controllers........................................................................32
6 Test Running ..........................................................................................33
6.1 Trial Operation and Testing...................................................................33
6.2 Working Temperature Range................................................................35
7 Troubleshooting and Maintenance.........................................................36
7.1 Troubleshooting.....................................................................................36
7.2 Routine Maintenance............................................................................37

DC Inverter U-match Series Cassette Type Unit
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1 Safety Precautions
WARNING!
This mark indicates procedures which, if improperly performed, might lead to
the death or serious injury of the user.
CAUTION!
This mark indicates procedures which, if improperly performed, might
possibly result in personal harm to the user, or damage to property.
WARNING!
(1). Installation should be left to the dealer or another professional. Improper installation may
cause water leakage, electrical shock, or fire.
(2). Install the air conditioner according to the instructions given in this manual. Incomplete
installation may cause water leakage, electrical shock, or fire.
(3). Be sure to use the supplied or specified installation parts. Use of other parts may cause the
unit to come to lose, water leakage, electrical shock, or fire.
(4). Install the air conditioner on a solid base that can support the weight of the unit. An inadequate
base or incomplete installation may cause injury in the event the unit falls off the base.
(5). Electrical work should be carried out in accordance with the installation manual and the
national electrical wiring rules or code of practice. Insufficient capacity or incomplete
electrical work may cause electrical shock or fire.
(6). Be sure to use a dedicated power circuit. Never use a power supply shared by another
appliance.
(7). For wiring, use a cable length enough to cover the entire distance with no connection. Do not
use an extension cord. Do not put other loads on the power supply, use a dedicated power
circuit. (Failure to do so may cause abnormal heat, electric shock or fire.)
(8). Use the specified types of wires for electrical connections between the indoor and outdoor
units. Firmly clamp the interconnecting wires so their terminals receive no external stresses.
Incomplete connections or clamping may cause terminal overheating or fire.
(9). After connecting interconnecting and supply wiring be sure to shape the cables so that they do
not put undue force on the electrical covers or panels. Install covers over the wires.
Incomplete cover installation may cause terminal overheating, electrical shock, or fire.
(10). If any refrigerant has leaked out during the installation work, ventilate the room. (The
refrigerant produces a toxic gas if exposed to flames.)
(11). After all installation is complete, check to make sure that no refrigerant is leaking out. (The
refrigerant produces a toxic gas if exposed to flames.)

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(12). When installing or relocating the system, be sure to keep the refrigerant circuit free from
substances other than the specified refrigerant (R410A), such as air. (Any presence of air or
other foreign substance in the refrigerant circuit causes an abnormal pressure rise or rupture,
resulting in injury.)
(13). During pump-down, stop the compressor before removing the refrigerant piping. If the
compressor is still running and the stop valve is open during pump-down, air will be sucked in
when the refrigerant piping is removed, causing abnormal pressure in the freezer cycle which
will lead to breakage and even injury.
(14). During installation, attach the refrigerant piping securely before running the compressor. If the
compressor is not attached and the stop valve is open during pump-down, air will be sucked in
when the compressor is run, causing abnormal pressure in the freezer cycle which will lead to
breakage and even injury.
(15). Be sure to establish an earth. Do not earth the unit to a utility pipe, arrester, or telephone
earth. Incomplete earth may cause electrical shock, or fire. A high surge current from lightning
or other sources may cause damage to the air conditioner.
(16). Be sure to install an earth leakage breaker. Failure to install an earth leakage breaker may
result in electric shocks, or fire.
(17). 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.
(18). Children should be supervised to ensure that they do not play with the appliance.
(19). 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.
CAUTION!
(1). Do not install the air conditioner in a place where there is danger of exposure to inflammable
gas leakage. If the gas leaks and builds up around the unit, it may catch fire.
(2). Establish drain piping according to the instructions of this manual. Inadequate piping may
cause flooding.
(3). Tighten the flare nut according to the specified method such as with a torque wrench. If the flare
nut is tightened too hard, the flare nut may crack after a long time and cause refrigerant leakage.

DC Inverter U-match Series Cassette Type Unit
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2 Outline of the Unit and Main Parts
Fig. 2.1

DC Inverter U-match Series Cassette Type Unit
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3 Preparative for Installation
3.1 Standard Accessory Parts
The standard accessory parts listed below are furnished and should be used as
required. Table 3.1
Indoor Unit Accessories
No.
Name
Appearance
Q'ty
Usage
1
Drain Hose
1
To connect with the hard
PVC drain pipe
2
Nut with Washer
4
To fix the hook on the
cabinet of the unit.
3
Washer
10
To be used together with the
hanger bolt for installing the
unit.
4
installation
paperboard
1
used for ceiling drilling
5
Gasket mounting
board
4
Used to prevent gasket from
falling off
6
Wireless Controller
+Battery
1+2
To control the indoor unit
7
sealing plaster
1
8
Fastener
4
To fasten the sponge
9
Insulation
1
To insulate the gas pipe
10
Insulation
1
To insulate the liquid pipe

DC Inverter U-match Series Cassette Type Unit
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11
Sponge
4
To insulate the drain pipe
12
Nut
1
To connect gas pipe
13
Nut
1
To connect liquid pipe
14
Enswathement
2
Table 3.2
Outdoor Unit Accessories
No.
Name
Appearance
Q'ty
Usage
1
Drain Plug
2 or 3
To plug the unused drain
hole.
2
Drainage Connecter
or
1
To connect with the hard
PVC drain pipe
3.2 Selection of the Installation Location
WARNING!
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.
CAUTION!
①. Do not install where there is the danger of combustible gas leakage.
②. Do not install the unit near heat source of heat, steam, or flammable gas.
③. Children under 10 years old must be supervised not to operate the unit.
Decide the installation location with the customer as follows:

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3.2.1 Indoor Unit
Select an installation site where the following conditions are fulfilled and that meets
your customer's approval.
Obstruct should be put away from the intake or outlet vent of the indoor unit so that
the airflow can be blown through all the room.
Make sure that the installation meets the requirement of the schematic diagram of
installation spaces.
Select the place where can stand 4 times of the weight of the indoor unit and would
not increase the operating noise and vibration.
The horizontality of the installation place should be guaranteed.
Select the place where is easy to drain out the condensate water, and connect with
outdoor unit.
Make sure that there are enough space for care and maintenance, and the height
fall between the indoor unit and ground is above 1800mm.
When installing the suspension bolt, check if the installation place can stand 4
times of the weight of the unit. If not, reinforce it before installation.
Note: There will be large amount of greasy dirt accumulated on the fan, heat
exchanger and water pump located in the dinning room and kitchen, which would
reduce the capacity of the heater exchanger, lead to leakage and abnormal operation
of the water pump.
>20mm(3/4inch)
≥1500mm
(59inch)
≥2500mm(98-3/8inch)
H
≥1500mm
(59inch)
Fig. 3.1
Table 3.3
Models
H(mm)
GKH24S3GI
260
GKH36S3GI
320
GKH42S3GI
GKH48S3GI

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3.2.2 Outdoor Unit
WARNING!
①. Install the unit where it will not be tilted by more than 5°.
②. During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely.
If possible, do not install the unit where it will be exposed to direct sunlight. (If
necessary, install a blind that does not interfere with the air flow.)
Install the outdoor unit in a place where it will be free from being dirty or getting wet
by rain as much as possible.
Install the outdoor unit where it is convenient to connect with the indoor unit.
Install the outdoor unit where the condensate water can be drained out freely
during heating operation.
Do not place animals and plants in the path of the warm air.
Take the air conditioner weight into account and select a place where noise and
vibration are small.
Install the outdoor unit where is capable of withstanding the weight of the unit and
generates as less noise and vibration as possible.
Provide the space shown in Fig. 3.2, so that the air flow is not blocked. Also for
efficient operation, leave three of four directions of peripheral constructions open.
＞500mm
(1-2/3feet)
＞2000mm
(6-5/9feet) ＞500mm
(1-2/3feet)
＞500mm
(1-2/3feet)
＞500mm
(1-2/3feet)
＞2000mm
(6-5/9feet)
＞1000mm
(3-2/7feet)
Fig. 3.2
3.3 Connection Pipe Requirement
CAUTION!
The maximum length of the connection pipe is listed in the Table below. Do not place the units between
which the distance exceeds the maximum length of the connection pipe.

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Table 3.4
Item
Model
Size of Fitting
Pipe(Inch)
Max. Pipe
Length (m)
Max. Height
Difference between
Indoor Unit and
Outdoor Unit (m)
Drainage pipe(Outer
Diameter ×wall
thickness) (mm)
Liquid
Gas
GKH24S3GI
GUHD24NS3GO
3/8
5/8
50
15
Φ20X1.2
GKH36S3GI
GUHD36NS3GO
15
GKH42S3GI
GUHD42NS3GO
30
GKH48S3GI
GUHD48NS3GO
30
The connection pipe should be insulated with proper water-proof insulating
material.
The pipe wall thickness shall be 0.5-1.0 mm and the pipe wall shall be able to
withstand the pressure of 6.0 MPa. The longer the connecting pipe, the lower the
cooling and heating effect performs.
3.4 Electrical Requirement
Electric Wire Size and Fuse Capacity.
Table 3.5
Indoor Units
Power Supply
Fuse Capacity
Breaker Capacity
Min. Power
Supply Cord
V/Ph/Hz
A
A
mm²
24k~48k
220-240V ~
50/60Hz
5
6
1.0
Table 3.6
Outdoor Units
Power Supply
Fuse
Capacity
Capability of
Air
Switch
Minimum Sectional
Area Of Earth Wire
(mm²)
V/Ph/Hz
A
A
mm²
GUHD24NS3GO
220-240V~ 50/60Hz
5
20
2.5
GUHD36NS3GO
220-240V~ 50/60Hz
5
25
4.0
GUHD42NS3GO
220-240V~ 50/60Hz
5
25
4.0
GUHD48NS3GO
220-240V~ 50/60Hz
5
40
6.0

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Notes:
①. The fuse is located on the main board.
②. Install the disconnect device with a contact gap of at least 3 mm in all poles nearby the units (Both
indoor unit and outdoor unit).The appliance must be positioned so that the plug is accessible.
③. Take 2 pieces of power cord of 0.75mm²as the communication lines between indoor and outdoor
unit, with their longest lengths of 50m. Please select the appropriate line length as per the actual
installation conditions. The communication lines can not be twisted together. For the unit (≤24k), it’s
recommended to use 8m long communication line.
④. Take 2 pieces of power cord of 0.75mm²as the communication lines between the wired controller
and the indoor unit, with their longest lengths of 30m. Please select the appropriate line length as per
the actual installation conditions. The communication lines can not be twisted together. It’s
recommended to use 8m long communication line.
⑤. The wire size of the communication line should be no less than 0.75 mm². It’s recommended to take
0.75 mm²power cords as the communication line.
4 Installation of the Unit
4.1 Installation of the Indoor Unit
4.1.1 Indoor unit dimension
For the units: 24~48k
A
B
C
D
E
F
G
H
I
J
Bottom face of ceiling
Fig. 4.1

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Table 4.1
Item
Model
A
B
C
D
E
F
GKH24S3GI
950
840
770
680
134
240
GKH36S3GI
950
840
770
680
134
290
GKH42S3GI
950
840
770
680
134
290
GKH48S3GI
950
840
770
680
134
290
4.1.2 Installing the Main Body Unit
Nut(field supplied)
Gas(attachment)
Hoisting stand
Tighten(double nuts)
[Fix the hoisting stand firmly]
Insert
Gasket anchor board(attachment)
[Fix the gasket firmly]
Center of the ceiling
opening
Water level
Polyethylene pipe Bolt(attachment) [Fix the paper template]
Bolt(attachment)
paper template
One bolt located at one corner of the outlet pipe
should be fixed on one corner of the drainage slot.
Fig. 4.2
(1). Install the hoisting stand on the hoisting screw by using nuts and gaskets at both
the upper and lower sides of the hoisting stand. To prevent the gasket from
breaking off, a gasket anchor board can be helpful.
(2). Install the paper template on the unit, and fix the drain pipe at the outlet vent.
(3). Adjust the unit to the best position.
(4). Check if the unit is installed horizontally at four directions. If not, the water pump
and the float switch would function improperly and even lead to water leakage.
(5). Remove the gasket anchor board and tighten the nut remained.
(6). Remove the paper template.

DC Inverter U-match Series Cassette Type Unit
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4.1.3 Installing the Suspension Bolts
(1). Using the installation template, drill holes for bolts (four holes). (Fig. 4.3)
(2). Install the bolts to the ceiling at a place strong enough to hang the unit. Mark the
bolt positions from the installation template. With a concrete drill, drill for 12.7 mm
(1/2”) diameter holes. (Fig. 4.4)
(3). Insert the anchor bolts into the drilled holes, and drive the pins completely into the
anchor bolts with a hammer. (Fig. 4.5)
Fig4.3 Fig4.4 Fig4.5
4.1.4 Leveling
The water level test must be done after installing the indoor unit to make the unit is
horizontal, as shown below.
Horizontal tester
Fig. 4.6
4.2 Installation of the Outdoor Unit
WARNING
①. Install the unit where it will not be tilted by more than 5°.
②. During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely.

DC Inverter U-match Series Cassette Type Unit
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4.2.1 Outdoor unit dimension
D
A
B
C
E
Fig. 4.7
Table 4.2 Unit: mm
Item
Model
A
B
C
D
E
GUHD24NS3GO
1005
425
790
610
391
GUHD36NS3GO
1105
440
1105
631
401
GUHD42NS3GO
GUHD48NS3GO
1085
425
1365
620
393
4.2.2 Condensate Drainage of the Outdoor Unit (Only for the heat
pump unit) (Fig. 4.8)
(1). It is required to install a drain pipe for the outdoor unit to drain out the condensate
water during heating operation. (only for the heat pump unit)
(2). When installing the drain pipe, apart from the drain pipe mounting hole, all other
holes should be plugged so as to avoid water leakage. (only for the heat pump
unit)
(3). Installation Method: Insert the pipe joint into the hole Φ25mm located at the base
plate of the unit and then connect the drain pipe to the pipe joint.
Bottom Drain cap
Drain pipe mounting hole
Chassis
Drain
connection
Fig. 4.8

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4.3 Installation of the Connection Pipe
4.3.1 Flare Processing
(1). Cut the connection pipe with the pipe cutter and remove the burrs.
(2). Hold the pipe downward to prevent cuttings from entering the pipe.
(3). Remove the flare nuts at the stop valve of the outdoor unit and inside the
accessory bag of the indoor unit, then insert them to the connection pipe, after that,
flare the connection pipe with a flaring tool.
(4). Check if the flare part is spread evenly and there are no cracks (see Fig. 4.9).
d2
d1
d1
d2
90°±1°
Fig. 4.9
4.3.2 Bending Pipes
(1). The pipes are shaped by your hands. Be careful not to collapse them.
Extend the pipe by unwinding it
√×
Fig. 4.10
(2). Do not bend the pipes in an angle more than 90°.
(3). When pipes are repeatedly bent or stretched, the material will harden, making it
difficult to bend or stretch them any more. Do not bend or stretch the pipes more
than three times.
(4). When bending the pipe, do not bend it as is. The pipe will be collapsed. In this
case, cut the heat insulating pipe with a sharp cutter as shown in Fig. 4.11, and
bend it after exposing the pipe. After bending the pipe as you want, be sure to put

DC Inverter U-match Series Cassette Type Unit
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the heat insulating pipe back on the pipe, and secure it with tape.
Pipe
Cutter
Cutt line
Heat insulating
pipe
Fig. 4.11
CAUTION!
①. To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 150
mm or over.
②. If the pipe is bent repeatedly at the same place, it will break.
4.3.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
CAUTION!
①. Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is improper, the
flare nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads will be damaged.
②. Do not remove the flare nut until the connection pipe is to be connected so as to prevent dust and
impurities from coming into the pipe system.
When connecting the pipe to the unit or removing it from the unit, please do use
both the spanner and the torque wrench. (Fig. 4.12)
When connecting, smear both inside and outside of the flare nut with refrigeration
oil, screw it hand tight and then tighten it with the spanner.
Refer to Table 4.3 to check if the wrench has been tightened properly (too tight
would mangle the nut and lead to leakage).
Examine the connection pipe to see if it leaks, then take the treatment of heat
insulation, as shown in the Fig. 4.12.
Use the medium-sized sponge to insulate the coupler of the gas pipe.

DC Inverter U-match Series Cassette Type Unit
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Sponge
Threaded fastener(×4)
Liquid pipe
Gas inlet pipe
Heat insulation sheath
(for the gas tube)
Heat insulation sheath
(for the liquid tube)
Fig. 4.12
Table 4.3 Flare nut tightening torque
Pipe Diameter
Tightening Torque
6mm (1/4inch)
15~30N·m (11~22ft.-1b.)
9.5mm (3/8inch)
35~40N·m (26~29ft.-1b.)
12.7mm (1/2inch)
45~50N·m (33~37ft.-1b.)
16mm (5/8inch)
60~65N·m (44~48ft.-1b.)
19mm(3/4Inch)
70-75 (N·m)
CAUTION!
Be sure to connect the gas pipe after connecting the liquid pipe completely.
4.3.4 Connecting the Pipe at the Outdoor Side Unit
Tighten the flare nut of the connection pipe at the outdoor unit valve connector.
The tightening method is the same as that as at the indoor side.

DC Inverter U-match Series Cassette Type Unit
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Gas pipe Liquid pipe
Pipe
coupling or
or
3-way valve 2-way valve
Fig. 4.13
4.3.5 Checking the Pipe Connections for Gas Leaking
For both indoor and outdoor unit side, check the joints for gas leaking by the use of
a gas leakage detector without fail when the pipes are connected.
4.3.6 Heat Insulation on the Pipe Joints (Indoor Side Only)
Stick coupler heat insulation (large and small) to the place where connecting pipes.
Front outlet
Coupler heat
insulation (small)
on the pipe
Liquid pipe Gas pipe
Reference A Coupler heat insulation
(large) on the pipe
Heat insulation pipe
Reference A:
Cover this portion with heat
insulating material also without fail
No gap
Fig. 4.14
4.3.7 Liquid Pipe and Drain Pipe
(1). If the outdoor unit is installed lower than the indoor unit (See Fig. 4.15)
1). A drain pipe should be above ground and the end of the pipe does not dip into
water. All pipes must be restrained to the wall by saddles.
2). Taping pipes must be done from bottom to top.
3). All pipes are bound together by tape and restrained to wall by saddles.

DC Inverter U-match Series Cassette Type Unit
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Fig. 4.15
(2). If the outdoor unit is installed higher than the indoor unit (See Fig. 4.16)
1). Taping should be done from lower to the upper part.
2). All pipes are bound and taped together and also should be trapped to prevent
water from returning to the room.
3). Restraint all pipes to the wall with saddles.
Fig. 4.16