Gree FGR20/BNa-M User manual

DUCT TYPE SPLITAIR CONDITIONER
SERVICE MANUAL
T1/R410A/50Hz
(GC201303- )

CONTENTS
PRODUCT .....................................................................................................2
1 MODELS LIST .......................................................................................................... 2
2 NOMENCLATURE..................................................................................................... 3
3 FUNCTION ................................................................................................................ 4
3.1 Features-outdoor units..................................................................................................................4
3.2 Features-indoor units....................................................................................................................4
4 PRODUCT DATA ...................................................................................................... 5
4.1 Product Data at Rated Condition .................................................................................................5
4.2 Operation Range ..........................................................................................................................8
5 PIPING DIAGRAM .................................................................................................... 9
5.1 Cooling Only .................................................................................................................................9
5.2 Heat Pump....................................................................................................................................9
CONTROL....................................................................................................11
1 OPERATION FLOWCHART.....................................................................................11
1.1 Cooling/Dry Operation.................................................................................................................11
1.2 Heating Operation.......................................................................................................................12
2 MAIN LOGIC............................................................................................................ 13
2.1 Cooling........................................................................................................................................13
2.2 Dry Mode.....................................................................................................................................13
2.3 Heating Mode..............................................................................................................................14
2.4 Defrosting....................................................................................................................................14
2.5 Fan Mode....................................................................................................................................15
2.6 Cooling mode .............................................................................................................................15
2.7 Dry mode ....................................................................................................................................16
2.8 Fan mode ...................................................................................................................................17
2.9 Heating mode .............................................................................................................................17
2.10 Defrosting mode .......................................................................................................................18
3.WIRED REMOTE CONTROLLER........................................................................... 19
3.1 Displaying Part............................................................................................................................19
3.2 Buttons........................................................................................................................................20
3.3 Installation of Wired Controller and Project Debugging ..............................................................21
3.4 Instruction to Operation...............................................................................................................22
3.5 Error Display ...............................................................................................................................34
3.6 Setting of Indoor Room Sensor and Checking of Outdoor Ambient Temperature.......................35
4 Wireless Remote Controller..................................................................................... 37
5 Centralized Controller-week timer............................................................................ 39
5.1 Function ......................................................................................................................................39
5.2 Operation View............................................................................................................................39
5.3 Display View................................................................................................................................40
5.4 Dimensions ................................................................................................................................41
INSTALLATION............................................................................................43
1 INDOOR UNIT INSTALLATION............................................................................... 43
1.1 Before Installation .......................................................................................................................43
1.2 Installation Site ...........................................................................................................................43
1.3 Dimension Data ..........................................................................................................................43

1.4 Installation Clearance Data ........................................................................................................44
1.5 Drain Piping Work ......................................................................................................................44
2 OUTDOOR UNIT INSTALLATION .......................................................................... 44
2.1 Before Installation ......................................................................................................................44
2.2 Installation Site ...........................................................................................................................45
2.3 Dimension Data ..........................................................................................................................45
2.4 Installation Clearance Data ........................................................................................................46
3 REFRIGERATION PIPING WORK ......................................................................... 47
3.1 Refrigeration Piping Work Procedures .......................................................................................47
3.2 Caution in Connecting Pipes.......................................................................................................47
3.3 Specication of Connection Pipe ...............................................................................................47
4 ELECTRIC WIRING WORK .................................................................................... 48
4.1 Wiring Principle ..........................................................................................................................48
4.2 Electric Wiring Design ................................................................................................................48
4.3 Specication of Power Supply Wire and Air Switch ...................................................................49
MAINTENANCE...........................................................................................51
1 TROUBLE TABLE.................................................................................................... 51
2 FLOW CHART OF TROUBLESHOOTING.............................................................. 52
2.1 High Pressure Protection............................................................................................................52
2.2 Low Pressure Protection.............................................................................................................53
2.3 Discharge protection...................................................................................................................54
2.4 Overcurrent Protection ...............................................................................................................54
2.5 Communication Malfunction .......................................................................................................55
2.6 Temperature sensor malfunction ................................................................................................55
2.7 Indoor Fan Overloading Protection.............................................................................................56
2.8 F0 Failure of Indoor Room Sensor at Air Intake..........................................................................56
2.9 F1 Failure of Evaporator Temp. Sensor ......................................................................................57
3 WIRING DIADRAM.................................................................................................. 58
4 DISASSEMBLYAND ASSEMBLY PROCEDURE OF MAIN PARTS ...................... 62
5 EXPLODED VIEWS AND PART LIST ..................................................................... 64
5.1 Indoor Unit ..................................................................................................................................64
5.2 Outdoor Unit................................................................................................................................72

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
PRODUCT

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
PRODUCT
1 MODELS LIST
Units
Series Model Name Product Code Capacity (kW/Ton) Ref Appearance
Cooling Heating Outdoor Indoor
Duct Type
FGR20/BNa-M
FGR20/BNa-M(O) CF015W1011
20/5.6 22/6.16
R410A
FGR20/BNa-M(O) CF015W1010
FGR20/BNa-M(I) CF015N1010
FG20/BNa-M / / 20/5.6 /
FGR25/CNa-M
FGR25/CNa-M(O) CF010W0720
24.5/6.86 27.5/7.7
R410AFGR25/CNa-M(I) CF010N0720
FG25/CNa-M / / 24.5/6.86 /
FGR30/BNa-M
FGR30/BNa-M(O) CF010W0521
30/8.4 33/9.24
R410A
FGR30/BNa-M(O) CF010W0522
FGR30/BNa-M(I) CF010N0521
FG30/BNa-M / / 30/8.4 /
FGR40/BNa-M
FGR40/BNa-M(O) CF015W1020
39.5/11.06 42/11.76
R410AFGR40/BNa-M(I) CF015N1020
FG40/BNa-M / / 39.5/11.06 /
Note:1Ton =12000Btu/h = 3.517kW

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
2 NOMENCLATURE
No. Description Options
1 FG Air-duct air supply
2 Unit type Cooling only type-Default Heat pump auxiliary electric heat type-R
Auxiliary hot water plate and pipe type-W
3 Cooling Capacity Nominal cooling capacity (kW)
4 Static pressure type Common type-omitted High static pressure-H
The outdoor unit is not expressed
5 Frequency conversion system Default-Fixed frequency
P-Frequency conversion
6 Control method Default-Routine
Y-Remote monitoring
7 Design No. Arranged based on A, B, C
8 Refrigerant
R22-Default
R407-N
R410a-Na
Others to be applied for when they are used
9 Production method Default-Self-control
10 Power type M: 380-415V~3Ph~50Hz
(The unit to be exported must be expressed)
11 Indoor and outdoor unit code O-Outdoor unit I-Indoor unit
The entire unit is not expressed.

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
3 FUNCTION
3.1 Features-outdoor units
Features Description
Quality condenser coil The coil is constructed of golden aluminum sheet and inner groove copper pipe.
Coil protected Coils are protected from damage by a metal grill.
Protected compressor High/low pressure protection, discharge high temperature protection, overload protection, reverse
(open) phase protection, sensor malfunction alarm.
Resisting corrosion Cabinet is made of pre-painted steel. The pre-treated at galvanized steel provides a better paint to steel bond, which resists corrosion and rust creep. Special primer formulas ensure minimal fading
when exposed to sunlight.
Low operating sound level Low noise fan and low noise compressor with isolator.
Low maintenance Quality compressor and motor are used.
Factory tested All units are factory tested prior to dispatch to verify system operation and control functioning before
shipment.
3.2 Features-indoor units
features Description
Flexible installation Condensing water tube and refrigerant tube are in same direction, it’s better for installation.
Long-distance duct air supply It adopts high static pressure design, so air is centralized handling in the indoor unit and implant long-
distance duct air supply.
The capacity range The capacity range is 20kW to 40kW.
Convenient operation Simple controller and intelligent remote controller make unit more convenient operation.
Good indoor air quality It can connect many supply-air outlet to the duct, so that it can make the temperature and humidity of the whole room equality, meanwhile, it can lead in fresh air, makes well indoor unit air quality. All units
are provided with lters that are easily accessible from the rear of the unit.
Microcomputer control The controls provide for compressor delay protection, Remote control function, temperature setting,
fan function, sleep function, memory function, self-diagnosis with alarm function.
Quality evaporator Evaporator coils are constructed of inner groove copper tube and hydrophilic aluminum sheet.
Low operating sound The fan motors are resilient mounted to minimize vibration and noise.

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
4 PRODUCT DATA
4.1 Product Data at Rated Condition
Models
Indoor
Unit
FGR/BNa-M(I) FGR/CNa-M(I) FG/BNa-M(I) FG/CNa-M(I)
20 25 20 25
Outdoor
Unit
FGR/BNa-M(O) FGR/CNa-M(O) FGR/BNa-M(O) FGR/CNa-M(O)
20 25 20 25
Nominal Capacity
At Rated ESP
Cooling Btu/h 68000 83598 68000 83598
kW 20 24.5 20 24.5
Heating Btu/h 75000 93834 / /
kW 22 27.5 / /
Power Supply V/Ph/Hz 380-415/3/50 380-415/3/50
Power Consumption Cooling kW 8.4 9.8 8.4 9.8
Heating 7 9.0 / /
Running Current Cooling A15.3 19.2 15.3 19.2
Heating 13.2 17.7 / /
Refrigerant Type R410a R410a
Refrigerant Charge kg 5.3 6.7 5.3 6.7
Indoor Unit
Power Supply V/Ph/Hz 380-415/3/50 380-415/3/50
Fan
Type Centrifugal / Belt Drive Centrifugal / Belt Drive
Air ow CFM 2380 2825 2380 2825
m3/h 4000 4800 4000 4800
Input Power W 1100 1500 1100 1500
Running Current A 2 3.4 2 3.4
Rated ESP in.wg 0.8 0.44 0.8 0.44
Pa 200 110 200 110
Fan Motor Protection - Overload protection Overload protection
Sound Pressure Level
(H/M/L/SL) dB(A) 56 54 56 54
Coil
Tube Material - Inner Groove Copper Tube Inner Groove Copper Tube
Diameter mm 7 7.94 7 7.94
Fin Material - Aluminum Aluminum
No.of Rows/
FPI - 3/16 3/16 3/16 3/16
Coil Area Sqm 0.766 0.63 0.766 0.63
Dimensions
(Outline/
Package)
Height
mm
389/400 500/673 389/470 500/673
Width 1463/1540 1500/1840 1463/1540 1500/1840
Depth 799/880 1000/1200 799/880 1000/1200
Weight(Net/Gross) kg 86/109 150/200 86/109 150/200
System Operation Control - Wired Control with LED Display
+ Wireless Controller Wired Control with LED Display + Wireless Controller
Condensate Drainage(O.D) mm 25.4 25.4
Air Filter - Standard Washable and Synthetic Standard Washable and Synthetic
To be continued

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
Models
Indoor
Unit
FGR/BNa-M(I) FGR/CNa-M(I) FG/BNa-M(I) FG/CNa-M(I)
20 25 20 25
Outdoor
Unit
FGR/BNa-M(O) FGR/CNa-M(O) FGR/BNa-M(O) FGR/CNa-M(O)
20 25 20 25
Outdoor Unit
Power Supply V/Ph/Hz 380-415/3/50 380-415/3/50
Compressor
Compressor Type Scroll Scroll
Nominal Current A12.87 16.4 12.87 16.4
L.R.A 98 142 98 142
Vibration Isolator Rubber Rubber
Protection Device Auto Reset Thermal Overload Auto Reset Thermal Overload
Fan
Fan Type/Drive Inner Groove Copper Tube Inner Groove Copper Tube
Fan Speed rpm 850±30 850 850±30 850
Blade Material Plastic Plastic
Diameter mm 524 524 524 524
Coil
Tube Material Inner Groove Copper Tube Inner Groove Copper Tube
Fin Material Aluminum Aluminum
No.of Rows/FPI 2/14.1 2/15 2/14.1 2/15
Coil Area Sqm 1.32 1.52 1.32 1.52
Sound Pressure Level dB(A) 65 66 65 66
Dimension
(Outline/Package)
Height
mm
1350/1370 1600/1715 1350/1370 1600/1715
Width 1150/1300 1150/1305 1150/1300 1150/1305
Depth 460/500 360/502 460/500 360/502
Weight(Net/Gross) kg 158/174 200/230 158/174 200/230
Pipe sizes Suction Inch "3/4 "1 "3/4 "1
Liquid "3/8 "3/8 "3/8 "3/8

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
Models
Indoor
Unit
FGR/BNa-M(I) FG/BNa-M(I)
30 40 30 40
Outdoor
Unit
FGR/BNa-M(O) FGR/BNa-M(O)
30 40 30 40
Nominal Capacity
At Rated ESP
Cooling Btu/h 102000 134780 102000 134780
kW 30 39.5 30 39.5
Heating Btu/h 112500 143310 / /
kW 33 42 / /
Power Supply V/Ph/Hz 380-415/3/50 380-415/3/50
Power Consumption Cooling kW 11 15.8 11 15.8
Heating 9 14 / /
Running Current Cooling A20.7 30 20.7 30
Heating 18 26.6 / /
Refrigerant Type R410a R410a
Refrigerant Charge kg 9.5 10.5 9.5 10.5
Indoor Unit
Power Supply V/Ph/Hz 380-415/3/50 380-415/3/50
Fan
Type Centrifugal / Belt Drive Centrifugal / Belt Drive
Air ow CFM 3230 4120 3230 4120
m3/h 5500 7000 5500 7000
Input Power W 1500 2200 1500 2200
Running Current A 3.7 4.2 3.7 4.2
Rated ESP in.wg 0.8 0.6 0.8 0.6
Pa 200 150 200 150
Fan Motor Protection - Overload protection Overload protection
Sound Pressure Level
(H/M/L/SL) dB(A) 57 58 57 58
Coil
Tube Material - Inner Groove Copper Tube Inner Groove Copper Tube
Diameter mm 9.52 9.52 9.52 9.52
Fin
Material - Aluminum Aluminum
No.of Rows/
FPI - 4/16 3/16 4/16 3/16
Coil Area Sqm 0.672 0.86 0.672 0.86
Dimensions
(Outline/
Package)
Height
mm
500/673 650/835 500/673 650/835
Width 1500/1840 1700/1890 1500/1840 1700/1890
Depth 1000/1200 1100/1460 1000/1200 1100/1460
Weight(Net/Gross) kg 156/206 215/265 156/206 215/265
System Operation Control - Wired Control with LED Display
+ Wireless Controller Wired Control with LED Display + Wireless Controller
Condensate Drainage(O.D) mm 25.4 25.4
Air Filter - Standard Washable and Synthetic Standard Washable and Synthetic
To be continued

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
Models
Indoor
Unit
FGR/BNa-M(I) FG/BNa-M(I)
30 40 30 40
Outdoor
Unit
FGR/BNa-M(O) FGR/BNa-M(O)
30 40 30 40
Outdoor Unit
Power Supply V/Ph/Hz 380-415/3/50 380-415/3/50
Compressor
Compressor Type Scroll Scroll
Nominal Current A16.93 27.6 16.93 27.6
L.R.A 142 197 142 197
Vibration Isolator Rubber Rubber
Protection Device Auto Reset Thermal Overload Auto Reset Thermal Overload
Fan
Fan Type/Drive Inner Groove Copper Tube Inner Groove Copper Tube
Fan Speed rpm 660 730 660 730
Blade Material Plastic Plastic
Diameter mm 750 750 750 750
Coil
Tube Material Inner Groove Copper Tube Inner Groove Copper Tube
Fin Material Aluminum Aluminum
No.of Rows/FPI 2/14.1 2/15 2/14.1 2/15
Coil Area Sqm 2.23 2.79 2.23 2.79
Sound Pressure Level dB(A) 67 69 67 69
Dimension
(Outline/Package)
Height
mm
1190/1772 1772/1950 1190/1772 1772/1950
Width 974/990 1290/1370 974/990 1290/1370
Depth 556/880 880/980 556/880 880/980
Weight(Net/Gross) kg 216/266 200/230 216/266 200/230
Pipe sizes Suction Inch "9/8 "9/8 "9/8 "9/8
Liquid "1/2 "5/8 "1/2 "5/8
4.2 Operation Range
Test condition Indoor side Outdoor side
DB(℃) WB(℃) DB(℃) WB(℃)
Nominal cooling 27 19 35 24
Nominal heating 20 -- 7 6
Rated cooling 32 23 43 26
Low temp cooling 21 15 18(-10) --
Rated heating 27 -- 24 18
Low temp heating 20 -- -7 -8

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Duct Type Split Air Conditioner
Service Manual
PRODUCT
5 PIPING DIAGRAM
5.1 Cooling Only
Indoor Unit
Indoor fan
Outdoor Unit
Electronic expansion valve
Outdoor fan
Condenser
Filter
Gas-liquid separator
compressor
Evaporator
5.2 Heat Pump
4-way vavel
D
C
SE
Indoor Unit
Indoor fan
Outdoor Unit
Electronic expansion valve
Outdoor fan
Condenser
Filter
Gas-liquid separator
compressor
Evaporator

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Duct Type Split Air Conditioner
Service Manual
CONTROL
CONTROL

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Duct Type Split Air Conditioner
Service Manual
CONTROL
CONTROL
1 OPERATION FLOWCHART
1.1 Cooling/Dry Operation
Power On
Make unit running at
cool or dry mode
Indoor fan run
Comp and outdoor fan run
Yes
Yes
Yes
No
Comp. and outdoor fan stop
Satisfying starting
comp condition
Comp. stops for 3 min
No
No

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Duct Type Split Air Conditioner
Service Manual
CONTROL
1.2 Heating Operation
Power On
Make unit running at
heat mode
Comp and outdoor fan run
Yes
Yes
Yes
No
Comp. and outdoor fan stop
Avoid cool wind
(only when comp. starts)
Satisfying starting
comp condition
Comp. stops for 3 min
No
No

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Duct Type Split Air Conditioner
Service Manual
CONTROL
2 MAIN LOGIC
The followings are for FG(R)20/BNa-M, FG(R)30/BNa-M
2.1 Cooling
Cooling mode
Compressor
Outdoor fan
Indoor fan
4-way valve
OFF ON
OFF ON
OFF
1s
5s 15s
OFF
ON
Run at set speed
Time
OFF
OFF
Manually OFF
OFF
Htap
When Tambient ≥Tset+1℃, the unit will run in cooling mode. In this case, compressor and outdoor fan
run; Indoor fan runs at setting speed.
When Tambient ≤Tset-1℃, the unit will stop running in cooling mode. In this case, compressor and outdoor
fan stop running; Indoor fan runs at setting speed.
When Tset -1℃＜ Tambient ≤Tset+1℃,the unit will keep its previous running state.
2.2 Dry Mode
OFF ON
OFF
1s
5s
15s
OFF
OFF
OFF
OFF
Manually OFF
Compressor
Outdoor fan
Indoor fan
4-way valve
ON
OFF ON
Htap Run at low speed
Time
Dry mode
When Tambient
≥
Tset+2
℃
, the unit will run in cooling mode. In this case, compressor and outdoor fan run;
Indoor fan runs at low speed.
When Tambient ≤Tset-2
℃
,the unit will stop running in cooling mode. In this case, compressor and outdoor
fan stop running.
When Tset -2
℃＜
Tambient ≤Tset+2
℃
,the unit will be in the state that the compressor runs for 6min and
stops for 4min in cycle. Indoor fan runs at low speed.

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Duct Type Split Air Conditioner
Service Manual
CONTROL
2.3 Heating Mode
Compressor
Outdoor fan
Indoor fan
4-way valve
OFF ON
OFF ON
OFF
OFF
ON
Run under set
speed
Time
OFF
OFF
ON
ON
Anti-cold air
Auxiliary heater OFF OFF
OFF
OFF
ON
Running condition
is met
Blowing residual heat
Manually OFF
Heating mode
1s 20s 10s 15s 45s 60s
When Tambient ≤Tset-1
℃
, the unit will run in heating mode. In this case, compressor and outdoor fan run;
Indoor fan runs at setting speed and under the condition of anti-cold air.
When Tambient ≥Tset+1℃,compressor and outdoor fan stop running, the 4-way valve is still energized
and indoor fan runs under the condition of blowing residual heat.
When Tset -1
℃＜
Tambient
＜
Tset+1
℃
,the unit will keep its previous running state.
2.4 Defrosting
1s10s 10s
ON
ON
Run at set speed
OFF
End defrosting
ON
OFF
OFF
OFF
ON
ON ON
ON
ON
ON
Compressor
Outdoor fan
Auxiliary heater
Indoor fan
4-way valve
Satrt defrostig
Running conditions
are met
Time
Anti cold air
Defroting mode
Defrosting start condition: If the unit heats for 44min accumulatively, the compressor continuously runs for
4min and 50s, and T condensate ≤-5
℃
,defrosting will start. If there is auxiliary heater, it will stop rstly and then
the 4-way valve, indoor fan and outdoor fan will stop in 10s and the compressor will compulsively run.
Defrosting end condition: If the unit defrosts for 10min or T condensate
≥
10
℃
, defrosting will end, 4-way
valve will start running, outdoor fan will run, and compressor compulsively run. Indoor fan will run under the anti-
cold air condition.

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Duct Type Split Air Conditioner
Service Manual
CONTROL
2.5 Fan Mode
5s
Fan mode
Compressor
Outdoor fan
Indoor fan
4-way valve
OFF
OFF
OFF
OFF
ON
Run at set
speed
Time
OFF
Manually OFF
OFF
Htap
Indoor fan will run at high speed for 5s and then at setting speed.
The followings are for FG(R)25/CNa-M, FG(R)40/BNa-M
2.6 Cooling mode
Sequence chart of unit stop during cooling operation
Fan mode
Compressor
Outdoor fan
Indoor fan
OFF
OFF
High speed
Time
OFF
ON
Control object
180s 5s
Sequence chart of unit start during cooling operation

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Duct Type Split Air Conditioner
Service Manual
CONTROL
Fan mode
Compressor
Outdoor fan
Indoor fan
ON
High speed
Time
OFF
Control object
360s 10s
ON
ON
OFF
V(set) ON
When Tambient
≥
Tset+1
℃
, the unit will run in cooling mode. In this case, compressor and outdoor fan run;
Indoor fan runs at setting speed.
When Tambient ≤Tset-1
℃
, the unit will stop running in cooling mode. In this case, compressor and outdoor
fan stop running; Indoor fan runs at setting speed.
When Tset -1
℃＜
Tambient ≤Tset+1
℃
,the unit will keep its previous running state.
2.7 Dry mode
Normally on mode during dry operation
Compressor
Outdoor fan
Indoor fan
OFF
OFF
High speed
Time
ON
Control object
180s 5s
OFF
Vset
ON
ON
Start for 6min and stop for 4min during dry operation
Compressor
Outdoor fan
Indoor fan
ON
Time
OFF
Control object
360s 240s
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
360s 240s
10s 5s
5s 10s

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Duct Type Split Air Conditioner
Service Manual
CONTROL
Room temperature is set to be 16-30
℃
and 24
℃
is default.
When Tambient
≥
Tset+2
℃
, the unit will run in cooling mode. In this case, compressor and outdoor fan run;
Indoor fan runs at low speed.
When Tambient ≤Tset-2
℃
, the unit will stop running in cooling mode. In this case, compressor and outdoor
fan stop running.
When Tset -2
℃＜
Tambient ≤Tset+2
℃
,the unit will be in the state that the compressor runs for 6min and
stops for 4min in cycle. Indoor fan runs at low speed.
2.8 Fan mode
Sequence chart during fan operation
Compressor
Outdoor fan
Indoor fan
OFF
Time
Control object
ON
ON
ON
ON
ON
OFF
OFF
OFF
Run for 45min
45min50s 60s
Defrosting command
Outdoor
Auxiliary electric
heater
4-way valve
When fan mode is set, the unit will run in fan mode.
Other parts
Indoor fan
Time
Control object
ON
ON
OFF
V(set)
2.9 Heating mode
Sequence chart of unit start during heating operation
Indoor fan
Compressor
Outdoor fan
Time
Auxiliary electric
heater (AEH)
>180s
5s
ON
ON
ON
OFF
OFF
OFF
OFF
(Vset)
ON
ON
(AEH working condition )
(Anti cold air condition)
>180s
5s
Control object
4-way valve