Gree GMV-ND22C/A-T User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Multi Variable Air Conditioners
Console Type Indoor Unit
Models:
GMV-ND22C/A-T
GMV-ND28C/A-T
GMV-ND36C/A-T
GMV-ND45C/A-T
GMV-ND50C/A-T

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 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 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.

Content
1 Safety Notices (Please be sure to abide them) ....................................................... 1
2 Installation of Indoor Unit.......................................................................................... 1
2.1 Indoor Unit........................................................................................................................ 3
2.2 Refrigerant Piping............................................................................................................. 5
2.3 Drain Piping ...................................................................................................................... 6
2.4 Installing Indoor Unit ......................................................................................................... 7
2.5 Wiring Requirements .......................................................................................................12
3 Constitutes and Names of Every Part of Indoor Unit............................................ 13
4 Working Temperature Range .................................................................................. 15
5 Remote Controller YAP1F ....................................................................................... 15
5.1 Button Name and Function Introduction...........................................................................15
5.2 Preparation before Operation ..........................................................................................16
5.3 Introduction of Operation Function...................................................................................16
5.4 Introduction of Special Function.......................................................................................19
5.5 Replacing Batteries in Remote Controller and NOTE.......................................................19
6 Maintenance Method ............................................................................................... 20
6.1 Units ................................................................................................................................20
6.2 Front Panel......................................................................................................................20
6.3 Filters...............................................................................................................................21
6.4 Titanium Apatite Photocatalytic ........................................................................................22
6.5 Replacement ...................................................................................................................23
6.6 Before a Long Idle Period ................................................................................................23
7 Function Description of Functional Dial Switch S7 .............................................. 24
8 Malfunction Analyzing............................................................................................. 24
8.1 Service Center.................................................................................................................25
8.2 After-Sales Service ..........................................................................................................25

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1 Safety Notices (Please be sure to abide them)
WARNING: If not abide them strictly, it may cause severe damage to the unit or the
people.
NOTE: If not abide them strictly, it may cause slight or medium damage to the unit or
the people.
This sign indicates that the items must be prohibited. Improper operation may cause
severe damage or death to people.
This sign indicates that the items must be observed. Improper operation may cause
damage to people or property.
This Multi VRF System shall only be connected to an appliance suitable for the same refrigerant;
All units in Manual Cover is a partial unit, complying with partial unit of IEC 60335-2-40:2018, and
must only be connected to other units that have been confirmed as complying to corresponding
partial unit requirements of this international standard.
The electrical interface shall comply with electrical security requirement, voltage shall be
220-240V (50Hz) or 208-230V (60Hz), current shall be referred to the table of “Wiring Requirements”
in Section 2.5, and safety class of construction is I.
Follow this manual to
complete the installation work.
Please read this manual
carefully before turning on or
repairing the unit.
Installation should be
performed by the distributor or
qualified technicians. Do not
install the product by yourself.
Improper installation may lead
to water leakage, electric
shock or fire hazard, etc.
Before installation, please
check whether the power
supply is complied with that
specified on the nameplate
and check the safety of the
power supply.
The air conditioner must be
grounded reliably for avoiding
electric shock. Please do not
connect the earthing wire to
gas pipe, water pipe, lightning
rod or telephone line.
Be sure to use special
accessories and parts for
installation to prevent water
leakage, electric shock and
fire hazard, etc.
If refrigerant leakage
happens, please ventilate the
room immediately.
Diameter of power cord
should be large enough. The
damaged power cord and
connection wire must be
replaced with special cables.
When the power cord is
connected, please fix the
electric box cover properly to
avoid safety accidents.

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Never fail to comply with the
nitrogen-charging welding
process. Do charge nitrogen
when welding the pipes.
Never short circuit or cancel
the pressure switch to prevent
unit damage.
As for the unit controlled by
the wired controller, connect
the wired controller well firstly
and then energize the unit;
otherwise, the unit can’t
operate normally.
When installation is finished,
please check whether the
drainage pipes, pipelines and
electric wires are connected
correctly to avoid water
leakage, refrigerant leakage,
electric shock or fire, etc.
Do not insert fingers or objects
into air outlet or air return
grille.
Open the door and window
frequently to keep good
ventilation for avoiding oxygen
deficit when gas heater or oil
heater is used in the room.
Never plug in or unplug the
power plug directly to turn on
or turn off the air conditioner.
Once the air conditioner is
turned on, it can be turned off
only after it has operated for
5min at least; otherwise, it will
affect the oil return of
compressor.
Do not allow children to
operate this air conditioner.
Do not operate this air
conditioner with wet hands.
The air conditioner can be
cleaned only when it has been
turned off and the power has
been cut off; otherwise, it may
cause electric shock or injury.
Never spray or flush water
towards the air conditioner;
otherwise, malfunction or
electric shock may happen.
Do not expose the air
conditioner to the moist or
corrosive environment.
Put through the power 8 hours
in advance before operation.
Do not cut off the power when
the air conditioner stops
operation for only about one
night (protect the
compressor).

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Volatile liquid, such as diluent
or gasoline, will damage the
appearance of air conditioner.
Only soft dry cloth and wet
cloth dipped with neutral
detergent can be used to
clean the outer case of air
conditioner.
Under cooling mode, please
don't set the room
temperature too low; keep the
temperature difference
between indoor and outdoor
within 5°C (41°F).
If there are any abnormal
circumstances (such as
burning smell, etc.), please
turn off the unit and cut off the
main power supply
immediately, and then contact
Gree appointed service
center. If those abnormal
circumstances still exit, the
unit may be damaged and it
may lead to electric shock or
fire hazard.
Do not repair the unit by
yourself. Wrong maintenance
may cause electric shock or
fire hazard. Please contact
Gree appointed service center
for help.
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.
Install units according to national wiring codes.
If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified
person in order to avoid a hazard.
An all-pole disconnection device which has at least 3mm clearances in all poles, and disconnection must be
incorporated in the fixed wiring in accordance with the wiring rules.
Gree Electric Appliances, Inc. of Zhuhai will not assume responsibility for any personal injury or property loss caused
by improper installation, improper debugging, unnecessary repair or not following the instructions of this manual.
2 Installation of Indoor Unit
(1) Selection of Installation location.
1) Such a place where cool air can be distributed throughout the room.
2) Such a place where condensation water is easily drained out.
3) Such a place that can handle the weight of indoor unit.
4) Such a place which has easy access for maintenance.
5) The appliance shall not be installed in the laundry.
(2) There are 2 styles of installation.
1) Wall mounted.
2) Floor type.
Each type is similar to the other as follows.
2.1 Indoor Unit
The indoor unit should be sited in a place where:
(1) The restrictions on installation specified in the indoor unit installation drawings are met.
(2) Both air intake and exhaust have clear paths met.
(3) The unit is not in the path of direct sunlight.
(4) The unit is away from the source of heat or steam.
(5) There is no source of machine oil vapour (this may shorten indoor unit life).

Multi Variable Air Conditioners Console Type Indoor Unit
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(6) Cool (warm) air is circulated throughout the room.
(7) The unit is away from electronic ignition type fluorescent lamps (inverter or rapid start type)
as they may shorten the remote controller range.
(8) The unit is at least 1 meter away from any television or radio set (unit may cause
interference with the picture or sound).
Cautions for Installation where air conditioner trouble is liable to occur.
1) Where there is too much of oil area.
2) Where it is acid base area.
3) Where there is irregular electrical supply.
Indoor Unit Installation Drawings.
The indoor unit may be mounted in any of the three styles shown here.
(Unit: mm)
Location for securing the installation pane Schematic drawing of hooks.

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2.2 Refrigerant Piping
(1) Drill a hole (65mm in diameter) in the spot indicated by О the symbol in the illustration and
below.
(2) The location of the hole is different depending on which side of the pipe is taken out.
(3) For piping, see Connecting the refrigerant pipe, under Indoor Unit Installation.
(4) Allow space around the pipe for an easier indoor unit pipe connection.
CAUTION!
Min. allowable length.
The suggested shortest pipe length is 2.5m, in order to avoid noise from the outdoor unit and
vibration (Mechanical noise and vibration may occur depending on how the unit is installed and the
environment in which it is used).
See the installation manual for the outdoor unit for the maximum pipe length.
For multi-connections, see the installation manual for the multi-outdoor unit.

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(Unit: mm)
Boring a wall hole and installing wall embedded pipe.
For walls containing metal frame or metal board, be sure to use a wall embedded pipe and wall
cover in the feed-through hole to.
Be sure to caulk the gaps around the pipes with caulking material to prevent water leakage.
(1) Bore a feed-through hole of 65mm in the wall so it has a down slope toward the outside.
(2) Insert a wall pipe into the hole.
(3) Insert a wall cover into wall pipe.
(4) After completing refrigerant piping, wiring, and drain piping, caulk pipe hole gap with putty.
(Unit: mm)
2.3 Drain Piping
(1) Use commercial rigid polyvinyl chloride pipe general VP 20 pipe, outer diameter 26mm,
inner diameter 20mm for the drain pipe.
(2) The drain hose (outer diameter 18mm at connecting end, 220mm long) is supplied with the
indoor unit. Prepare the drain pipe picture below position.
(3) The drain pipe should be inclined downward so that water will flow smoothly without any
(Should not be trap).
(4) Insert the drain hose to this depth so it won’t be pulled out of the drain pipe.
(5) Insulate the indoor drain pipe with 10mm or more of insulation material to prevent
condensation.
(6) Remove the air filters and pour some water into the drain pan to check the water flows
smoothly.
(7) 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.

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(8) 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.
(9) Condensate drain pipe should be connected into special drain system for air conditioner.
2.4 Installing Indoor Unit
2.4.1 Preparation
(1) Open the front panel, remove the 4 screws and dismount the front grille while pulling it
forward.
(2) Follow the arrows to disengage the clasps on the front case to remove it.
(3) Follow the procedure below when removing the slit portions.
For Moldings:
Remove the pillars (Remove the slit portions on the bottom frame using nippers).
For Side Piping:
Remove the pillars.
1) Remove the 7screws.
2) Remove the upper casing (2 tabs).
3) Remove the left and right casings (2 tabs on each side).
4) Remove the slit portions on the bottom frame and casings using nippers.

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5) Return by following the steps in reverse order (3>2>1).
2.4.2 Installation
Secure using 6 screws for floor installations (Do not forget to secure to the rear wall).
For wall installations, secure the mounting plate using 5 screws and the indoor unit using 4
screws.
The mounting plate should be installed on a wall which can support the weight of the indoor unit.
(1) Temporarily secure the mounting plate to the wall, make sure that the panel is completely
level, and mark the boring points on the wall.
(2) Secure the mounting plate to the wall with screws.
Floor Installation
Casing
Wall Installation
195mm
Molding
6screws 6screws
(3) Once refrigerant piping and drain piping connections are complete, fill in the gap of the
through hole with putty. A gap can lead to condensation on the refrigerant pipe, and drain
pipe, and the entry of insects into the pipes.
(4) Attach the front panel and front grille in their original positions once all connections are
complete.
Flaring the pipe end:
(1) Cut the pipe end with a pipe cutter.
(2) Remove burrs with the cut surface facing downward so that the chips do not enter the pipe.
(3) Fit the flare nut on the pipe.
(4) Flare the pipe.
(5) Check that the flaring is properly made.

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WARNING!
①Do not use mineral oil on flared part.
②Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
③Never use piping which had been used for previous installations. Only use parts which are
delivered with the unit.
④Do never install a drier to this R410A unit in order to guarantee its lifetime.
⑤The drying material may dissolve and damage the system.
⑥Incomplete flaring may cause refrigerant gas leakage.
Connecting the refrigerant pipe:
(1) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and
gas leaks.
(2) Align the centers of both flares and tighten the flares and tighten the flare nuts 3 or 4 turns by
hand. Then tighten them fully with the torque wrenches.
(3) To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces in the flare
(Use refrigeration oil for R410A).
Flarenut tightening torque
Gas side
Liquid side
22/28 class
36/45/50 class
22/28/36/45/50 class
3/8 inch
1/2 inch
1/4 inch
32.7-39.9 N.m
(333-407kfg.cm)
49.5-60.3 N.m
(505-615kfg.cm)
14.2-17.2 N.m
(144-175kfg.cm)
Caution on piping handling:
(1) Protect the open end of the pipe against dust and moisture.
(2) All pipe bends should be as gentle as possible. Use a pipe bender for bending.
(Bending radius should be 30 to 40mm or larger).
Selection of copper and heat insulation materials.

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When using commercial copper pipes and fittings, observe the following:
(1) Insulation material: Polyethylene foam.
Heat transfer rate:0.041 to 0.052W/m K (0.035 to 0.045kca/(m h °C)).
Refrigerant gas pipe’s surface temperature reaches 110 max.
Choose heat insulation materials that will withstand this temperature.
(2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as
below.
Gas side
Liquid side
Gas pipe thermal insulation
Liquid pipe thermal insulation
22/28 class
36/45/50 class
—
22/28 class
36/45/50 class
—
O.D.9.52mm
O.D.12.7mm
O.D.6.35mm
I.D.12-15mm
I.D.14-16mm
I.D.8-10mm
Thickness 0.8mm
Thickness 10mm Min.
(3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Checking for gas leakage.
(4) Check for leakage of gas after air purging.
(5) See the sections on air purges and gas leak checks in the installation manual for the outdoor
unit.
Attaching the connection pipe.
Attach the pipe after checking for gas leakage, described above.
(1) Cut the insulated portion of the on-site piping, matching it up with the connecting portion.
(2) Secure the slit on the refrigerant piping side with the butt joint on the auxiliary piping using
the tape, making sure there are no gaps.
(3) Wrap the slit and butt joint with the included insulation sheet, making sure there are no gaps.

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CAUTION!
①Insulate the joint of the pipes securely. Incomplete insulation may lead to water leakage.
②Push the pipe inside so it does not place undue force on the front grille.
Connecting the drain hose.
Insert the supplied C drain hose into the socket of the drain pan.
Fully insert the drain hose until it adheres to a seat of the socket.
WARNING!
With a Multi indoor unit, install as described in the installation manual supplied with the outdoor
unit.
Live the sensor securing plate, remove the front metal plate cover, and connect the wire to the
terminal board.
(1) Open the cover of electric box of indoor unit.
(2) Lead the communication line across the rubber ring.
(3) Connect the communication line to terminal D1 and D2 on the wiring board of indoor unit.
(4) Secure the communication line with the wire clamp on the electric box. Pull wires to make
sure that they are securely latches up, and then retain wires with wire retainer.

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NOTES!
The power of every indoor unit should be unity power supply.
①The power connection cord has been inserted on the mainboard through the piping hole of
the chassis. Please connect the power connection cord with the breaker. If the power cord is
not long enough, please prolong it with terminal block.
②Reinstall the wiring cover on the original place and tighten the bolt.
③Recover the surface panel.
CAUTION!
①Do not use tapped wires, stranded wires, extension cords, or starburst connections, as they
may cause overheating, electrical shock, or fire.
②Do not use locally purchased electrical parts inside the product (Do not branch the power for
the drain pump, etc, from the terminal block). Doing so may cause electric shock or fire.
Install the drainage pipe.
(1) For well draining, the drain hose should be placed at a downward slant.
(2) Do not wrench or bend the drain hose or flood its end by water.
(3) Wrap heat resistant material when connect the longer drainage tube though indoor.
Wrenched Bent
Flooded
Install the connection pipes.
Connect the connect pipe with the two relative leading pipe, tie the nut on tie in of the connect
pipe tightly.
NOTES!
①Be careful in bending the connection pipes, or you will damage the pipes.
②If the tightening torque is too great in tightening the flare nut, leakage will happen.
2.5 Wiring Requirements
Model Power Cord Size Air Switch Capacity(A)
Minimum Sectional
Area of Ground
Wire(mm
2
)
Minimum Sectional
Area of Power
Cord(mm
2
)
GMV-ND22C/A-T
GMV-ND28C/A-T
GMV-ND36C/A-T
GMV-ND45C/A-T
GMV-ND50C/A-T
220~240V ~ 50Hz
208~230V ~ 60Hz 6 1 1

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NOTES!
①Use copper wire only as unit’s power cord. Operating temperature should be within its rated
value.
②If the power cord is more than 15m long, please increase properly the sectional area of
power cord to avoid overload, which may cause accident.
③Above selection requirements: Power cord size is based on BV single-core wire (2~4pc) at
40°C ambient temperature when laying across plastic pipe. Air switch is D type and used at
40°C. If actual installation condition varies, please lower the capacity appropriately
according to the specifications of power cord and air switch provided by manufacturer.
④If the supply cord is damaged, it must be replaced by the manufacturer or its service agent
or a similarly qualified person in order to avoid a hazard.
⑤Install cut-off device near the unit. The minimum distance between each stage of cut-off
device should be 3mm (The same for both indoor unit and outdoor unit).
3 Constitutes and Names of Every Part of Indoor Unit
CAUTION!
①Before opening the front panel, be sure to stop the operation and turn the breaker
OFF.
②Do not touch the metal parts on the inside of the indoor unit, as it may result in injury.
(1) Titanium Apatite Photocatalytic.
Air-Purifying Filter:
These filters are attached to the inside of the air filters.
(2) Air outlet.
(3) Display.
(4) Front panel.
(5) Louvers (vertical blades).
The louvers are inside of the air outlet.
(6) Air inlet.
(7) Air filter.
(8) Flap (horizontal blade).
(9) Cool mode lamp.
(10) Heat mode lamp.
(11) Dry mode lamp.
(12) Run lamp.
(13) LED display.
(14) Indoor Unit ON/OFF switch:
1) Push this switch once to start operation.
2) Push once again to stop it.
3) The operation mode refers to the following table.

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Model
Mode
Temperature seting
Air flow rate
HEAT PUMP
AUTO
26°C
AUTO
4) This switch is useful when the remote controller is missing.
(15) Signal receiver:
1) It receives signals from the remote controller.
2) When the unit receives a signal, you will hear a short beep.
3) Settings changed beep.
(16) Air outlet selection switch.
It senses the air temperature around the unit.
NOTES!
①If the supply cord is damaged, it must be replaced by the manufacturer or its service agent
or a similarly qualified person in order to avoid a hazard.
②The appliance shall be installed in accordance with national wiring regulations.
③An all-pole disconnection switch having a contact separation of at least 3mm in all poles
should be connected in fixed wiring.
④An all-pole disconnection switch having a contact separation of at least 3mm in all poles
should be connected in fixed wiring.

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4 Working Temperature Range
— Indoor side state Outdoor side state
Dry bulb temp°C
Wet bulb temp°C
Dry bulb temp°C
Wet bulb temp°C
Rated Cooling
27
19
35
24
Max. cooling
32
23
43
26
Min. cooling
21
15
18
—
Rated Heating
20
15
7
6
Max. heating
27
—
24
18
Min. heating
20
15
-15
-16
5 Remote Controller YAP1F
5.1 Button Name and Function Introduction
No.
Button name
Function
1
ON/OFF
Turn on or turn off the unit.
2
TURBO
Set turbo function.
3 MODE Set operation mode.
4
Set up&down swing status.
5
I FEEL
Set I FEEL function.
6 TEMP Switch temperature displaying type on the unit’s display.
7 Set health function and air function.
8
LIGHT
Set light function.
9
X-FAN
Set X-FAN function.
10
SLEEP
Set sleep function.
11
CLOCK
Set clock of the system.
12
TOFF
Set timer off function.
13
TON
Set timer on function.
14
Set left&right swing status.
15 FAN Set fan speed.
16
/
Set temperature and time.

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5.2 Preparation before Operation
When using the remote controller for the first time or after replacing the batteries, please set the
time of the system according to current time in the following steps:
(1) Pressing “CLOCK” button, is blinking.
(2) Pressing “” or “ ” button, the clock time will increase or decrease rapidly.
(3) Press “CLOCK” button again to confirm the time and return to display current time.
5.3 Introduction of Operation Function
(1) Selecting operation mode.
In unit on status, press “MODE” button to select operation mode in following sequence:
(2) Setting temperature.
In unit on status, press “ ” button to increase setting temperature and press “ ” button to
decrease setting temperature. The range of temperature is from 16°C to 30°C.
NOTE!
Under auto mode, manual adjustment of temperature is not needed.
(3) Adjusting fan speed.
In unit on status, press “FAN” button to adjust fan speed in following sequence:
NOTES!
①When operation mode changes, fan speed is memoried.
②Under dry mode, fan speed is low and can not be adjusted.
(4) Setting swing function.
1) Setting left&right swing.
A. Under simple swing status, press “” button to adjust left&right swing status.
B. Under fixed-angle swing status, press “ ” button to adjust left&right swing angle
circularly as below:
closed
NOTE!
Operate continuously left&right swing in 2 seconds, swing states will change according to
above-mentioned order, or switch closed state and state.
2) Setting up&down swing.
A. Under simple swing status, press “ ” button to adjust up&down swing status.
B. Under fixed-angle swing status, press “ ” button to adjust up&down swing