Gree A Series User manual

A Series Modular-type Air-cooled (Heat Pump) Chiller

Contents
1 Safety Notice ............................................................................................................. 1
2 Preface ...................................................................................................................... 1
3 Product Information ................................................................................................... 1
3.1 Instroduction ........................................................................................................ 1
3.1.1 Lineup ......................................................................................................... 1
3.1.2 Model Number Nomenclature..................................................................... 2
3.1.3 Product Features ........................................................................................ 2
3.1.4 Nominal Operating Conditions.................................................................... 3
3.1.5 Operation Range......................................................................................... 3
3.2 Unit Performance Curves .................................................................................... 3
3.3 Working Principle................................................................................................. 5
3.3.1 Principle Diagrams...................................................................................... 5
3.4 Techinical Parameters List................................................................................... 5
3.4.1 Electrical Parameters.................................................................................. 5
3.4.2 Performance Parameters Table.................................................................. 6
3.5 Scope of Supply .................................................................................................. 7
3.6 Selection Statement ............................................................................................ 7
3.6.1 Selection Procedures.................................................................................. 7
4 Unit Control.............................................................................................................. 13
4.1 Schematic Diagram ........................................................................................... 13
4.2 Operation Flowchart .......................................................................................... 15
4.2.1 Cooling ..................................................................................................... 15
4.2.2 Heating...................................................................................................... 16
4.3 Key Control Logics............................................................................................. 17
4.3.1 Cooling Control ......................................................................................... 17
4.3.2 Heating Control ......................................................................................... 17
4.3.3 Automatic Anti-freezing Operation............................................................ 18
4.3.4 Control to the Compressor........................................................................ 18
4.3.5 Control to the Fan ..................................................................................... 18
4.3.6 Control to the 4–way Valve ....................................................................... 18
4.3.7 Control to the Water Pump........................................................................ 18
4.3.8 Control to the Electronic Expansion Valve................................................ 18
4.3.9 Protection.................................................................................................. 18
4.4 General Introduction .......................................................................................... 19

4.4.1 Homepage ................................................................................................ 20
4.4.2 Menu Page................................................................................................ 21
4.4.3 Introduction to the Pop-up Windows......................................................... 22
4.4.4 Backlight.................................................................................................... 23
4.5 Operation Instructions ....................................................................................... 23
4.5.1 On/Off........................................................................................................ 23
4.5.2 Functions.................................................................................................. 24
4.5.3 Parameter ................................................................................................. 34
4.5.4 Information ................................................................................................ 35
4.5.5 E-Clear...................................................................................................... 46
4.5.6 General ..................................................................................................... 47
4.5.7 Setup of Toggle Switches on the Motherboard......................................... 51
4.6 Smart Management System.............................................................................. 52
4.6.1 Long-distance Monitoring/BMS Interface ................................................. 52
4.6.2 Network of the Long-distance Monitoring System.................................... 53
4.6.3 Hardware .................................................................................................. 54
4.6.4 Model Selection Instructions..................................................................... 55
5 Unit Installation ........................................................................................................ 58
5.1 Installation Flowchart......................................................................................... 58
5.2 Preparations before Installation......................................................................... 59
5.2.1 Precautions for Installation ....................................................................... 59
5.2.2 Importance of Installation.......................................................................... 60
5.2.3 Selection of Installation Materials ............................................................. 61
5.3 Tools................................................................................................................... 67
5.3.1 Cutting and Finishing Tools....................................................................... 67
5.3.2 Measuring Tools........................................................................................ 67
5.4 Installation Instructions...................................................................................... 69
5.4.1 Outline Dimensions................................................................................... 69
5.4.2 Precautions for Installation ....................................................................... 70
5.4.3 Installation Environment .......................................................................... 70
5.4.4 Installation and Service Space ................................................................. 71
5.4.5 Installation Foundation.............................................................................. 71
5.4.6 Handling and Lifting .................................................................................. 72
5.5 Piping and Insulation ......................................................................................... 73
5.5.1 Installation of the Water System ............................................................... 73
5.5.2 Requirements on Piping........................................................................... 76

5.5.3 Installation of the Expansion Tank ............................................................ 84
5.5.4 Installation of Condensate Pipes .............................................................. 86
5.6 Electric Wiring.................................................................................................... 88
5.6.1 Safety Precautions.................................................................................... 88
5.6.2 Control Concept ........................................................................................ 88
5.6.3 Specification of Power Cord and Air Switch ............................................. 90
5.6.4 Wiring of the Electric Control Cabinet....................................................... 90
5.6.5 Filed Wiring ............................................................................................... 91
5.6.6 Networking and Wiring between Units...................................................... 94
5.6.7 Electric Wiring Digram .............................................................................. 96
5.6.8 Jumpers .................................................................................................... 98
6 Commissioning ........................................................................................................ 98
6.1 Flowchart of Commissioning ............................................................................. 98
6.2 Safety Precautions for Commissioning ............................................................. 99
6.3 Preparation before Commissioning .................................................................. 99
6.3.1 Documents................................................................................................ 99
6.3.2 Tools.......................................................................................................... 99
6.3.3 Check before Commissioning................................................................. 100
6.4 Initial Run......................................................................................................... 101
6.4.1 Check for Initial Run................................................................................ 101
7 Repair .................................................................................................................... 103
7.1 Error List .......................................................................................................... 103
7.2 Flow Chart of Troubleshooting ........................................................................ 106
7.3 Power Distribution ............................................................................................111
7.3.1 Power Distribution Logic ..........................................................................111
7.3.2 Introduction to the Main Electric Element ...............................................112
7.4 Replacement of Main Parts ..............................................................................112
7.4.1 Brief Introduction......................................................................................112
7.4.2 Replacement Instructions ........................................................................113
7.5 Routine Repair................................................................................................. 128
7.5.1 Repairs to Refrigerant Leakage.............................................................. 128
7.5.2 Air Removal............................................................................................. 129
7.6 Exploded Views and Part Lists ........................................................................ 130
8 Maintenance .......................................................................................................... 130
8.1 Significant of Maintenance .............................................................................. 130
8.2 Maintenance Items .......................................................................................... 130

8.2.1 Routine Maintenance Items.................................................................... 130
8.2.2 Periodic Maintenance Items ................................................................... 130
8.3 Freeze Protection in Winter ............................................................................. 132

1
1Safety Notice
Safety symbols
The following symbols are used in this document to alert the reader to potential of hazard.
WARNING indicates a potentially hazardous situation which, if not avoided, could
result in damage to the machine as well as death or serious injury.
CAUTION identifies a hazard which could lead to minimal or moderate damage to
the machine as well as death or serious injury.
BAN indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury.
COMPLIANCE identifies a hazard which could lead death or serious injury as well
as damage to the property.
2Preface
Thank you for selecting Gree’s A Series Inverter Modular Air-cooled Chiller (Heat Pump).
Please read this instruction manual carefully before installing and using the product and
achieve operating effect, we hereby instruct as below:
The Manual is applied to A Series Inverter Modular Air-cooled Chiller (Heat Pump),
specifying operation safety requirements, basic principles and implementation approaches for
construction fulfillment, construction debug, after-sale maintenance and repairs. All works
must be performed in accordance with the relevant national (and local) safety requirements
and the Manual, which if not abided, could result in potential damage to the air conditioner, and
even serious injury or death.
3Product Information
3.1 Instroduction
3.1.1 Lineup
Series Model
Cooling
capacity
Heating
capacity Power
supply Refrigerant Diagram
（KW） （KW）
A series
inverter
modular
air-cooled
chiller
(heat
pump)
LSQWR-
F35VM/
NaA-M
32 36
380–
415VAC
3Ph
50Hz
R410A
LSQWR-
F60VM/
NaA-M
60 65
LSQWR-
F65VM/
NaA-M
65 70
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3.1.2 Model Number Nomenclature
LS QW R F 60 V M / Na A —M
1 2 3 4 5 6 7 8 9 10
No Code description Options
1Unit LS:chiller
2Compressor type QW: hermetic scroll/rotor type
3 Unit function Default:cooling only
R:heat pump
4Cooling method of condenser F:air-cooled
5Rated cooling capacity Rated cooling capacity = number (kW)
6Variable frequency Default-fixed speed
7Assembly method M:modular
8Refrigerant type Na:R410A
9Design code A-Z alphabetic order
10 Power code 380–415VAC 3Ph 50HZ
For instance, LSQWRF60VM/NaA-M indicates an inverter modular air-cooled chiller with a
fully enclosed rotor-type compressor, featuring 60kW cooling capacity and using R410A
refrigerant (Lengshui, Quanfengbi, Woxuan/Zhuanzi, Rebeng, Fengleng, 60kW, Variable
spped, Modular, R410A, A, 380–415V~3N~50HZ)
3.1.3 Product Features
The all-inverter modular air-cooled chillers work outstandingly by virtue of their major
features stated below..
■Excellent compatibility：
The all-inverter modular air-cooled chillers can be constructed of multiple single units with
the same or different structure or capability (30kW, 60kW, 65kW). For the 35kW unit, it has
only one cooling system; for the 60kW, 65kW units, they are of two independent systems. Up
to 16 single units can be modularized, with cooling capacity ranging from 35kW to 1040kW.
■Comfort and energy saving：
The variable-frequency technology can quickly respond to load change and lead to
decreased water temperature fluctuation and better comfort.
■Ultra-quiet：
The high-efficiency and low-noise fan blades and motor as well as the optimized air passage
can greatly lower operation noise of the unit. Besides, the quite mode can provide the user a
ultra-quite environment.
■Powerful self-protection：
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It is equipped with the top-end microcomputer control system which is capable of providing
well-rounded protection and self-diagnosis.
■High reliability：
It is constructed of well-designed refrigeration parts and well-designed system, structure
and electric control, adequately guaranteeing reliable operation
■Remote ON/OFF：
The unit can be started or stopped by the ON/OFF key operation.
■Equilibrium running：
It indicates each compressor will run alternately so as to extend their service life.
■Shiftwork of water pumps：
Two water pumps can work alternately with equilibrium runtime so as to extend their service
life and lower the maintenance difficulty.
3.1.4 Nominal Operating Conditions
Item
Water side Air side
Water flow m3/
（h·kW）
Outlet
temparature
（℃）
Dry bulb
temperature
（℃）
Wet bulb
temperature
（℃）
Cooling 0.172 7 35 —
Heat pump 45 7 6
3.1.5 Operation Range
Please run the unit under the specified operation range as shown in the table below:
■ R410A Series
Item
Water Side Air Side
Leaving Water
Temperature（℃）
Water Temperature
Difference（℃）
Ambient DB
Temperature（℃）
Cooling 5～20 2.5～6 –15～52
Heating 35～50 2.5～6 -20～40
maximum and minimum entering water pressures:
Item Minimum entering water
pressures
Maximum entering water
pressures
Cooling 0.06MPa 1.6MPa
Heating
3.2 Unit Performance Curves
Here are curves indicating the unit performances in cooling and heating states.
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A Series Modular-type Air-cooled (Heat Pump) Chiller

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3.3 Working Principle
3.3.1 Principle Diagrams
3.4 Techinical Parameters List
3.4.1 Electrical Parameters
Electrical parameters table
Unit Power
supply
Compressor MRC NRC Fan NRC
Quantity (A) (A) Quantity (A)
LSQWR-
F35VM/
NaA-M
380V~41-
5VAC 3Ph
50Hz
1 30 17.5 2 0.7
LSQWR-
F60VM/
NaA-M
380V～
415VAC
3Ph 50Hz
2 30 17.5 2 1.28
LSQWR-
F65VM/
NaA-M
380V～
415VAC
3Ph 50Hz
230 17.5 2 1.28
Notes:
(1)MRC: Maximum Running Current (A)
(2)NRC: Nominal Running Current (A)
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3.4.2 Performance Parameters Table
Model LSQWRF35V-
M/NaA-M
LSQWRF60V-
M/NaA-M
LSQWRF65V-
M/NaA-M
Cooling capacity kW 32 60 65
Heating capacity kW 36 65 70
Rated cooling power kW 12.4 21.9 24.8
Rated heating power kW 10.8 20.2 21.9
Noise dB(A）62 68 68
Power supply 380–415V 3N ～50Hz
Operation control
The microcomputer implementing fully automatic
control, displaying the operation state and giving
an alarm
Safety controls
High-pressure and low-pressure safety cut-out,
high-discharge temperature cut-out, antifreeze
control, overflow control, phase safety device,
water flow safety control, pressure sensor cut-out,
temperature sensor cut-out, four-way valve safety
control, compressor overheat control
Compres-
sor
Type Fully enclosed rotor-type compressor
Quantity 1 2 2
Starting mode With variable frequency
Water-side heat
exchanger High-efficiency shell and tube heat exchanger
Water flow
volume wm3/h 5.5 10.32 11.18
Water
resistance kPa 75 55 60
The highest
bearing
pressure
MPa 4.6
Connection method By external threads
Connection
Thread -G1 1/2 external thread
G2 External
thread
G2 External
thread
Air Air-side heat exchanger High-efficiency finned coil heat exchanger
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Rated power
of fan W 750×2 750×2 750×2
Airflow volume m3/h 1.26×1042.4×1042.4×104
Outline
dimension
Width mm 1340 2200 2200
Depth mm 845 965 965
Height mm 1605 1675 1675
Wet weight kg 400 689 689
Operating weight kg 440 758 758
3.5 Scope of Supply
Item Heat pump
Modules S
Three-wire control lines (8m) S
Accessories for the unit XE73-25/G S (Additionally purchased)
Electric control cabinet O
Auxiliary electric heater O
Power lines O
Control lines O
Connecting hose O
Thermometer O
Pressure gauge O
S= standard O= user prepared P= Optional
3.6 Selection Statement
3.6.1 Selection Procedures
Calculate the load for each separate area (cooling load and fresh air load)→Select the
terminal unit→Select the main unit→Check the cooling load→Make a confirmation
3.6.1.1 Load Estimate
3.6.1.1.1 Cooling and Heating Load
Table 3.6.1 Cooling Load per Unit of Air Conditioning Area
Construc-
tion
category
Room Type
Cooling
load（W/
m2）
Construc-
tion
category
Room Type Cooling load
（W/m2）
Hotel Hotel, all 70～95 Hospital Hospital, all 105～130
Guest room 70～100 VIP ward 80～120
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Pub, cafe 80～120 Average ward 70～110
West
restaurant 100～160
Rooms for
diagnosis,
treatment and,
injection
75～140
Chinese
restaurant,
banquet hall
150～250 X-ray, CT and
MRT Room 90～120
Store 80～110 operation and
delivery room 100～150
Lounge 80～100 Clean operating
room 180～380
Atrium 100～180 Service hall 70～120
Small
meeting
room
(smoking
area)
140～250
Depart-
ment store
First floor/ground
floor 160～280
Large
meeting
room (no
smoking
area)
100～200 Intermediate floor 150～200
Hairdressing
room 90～140 Top floor 180～250
Gym 100～160 Department store 210～240
Bowling alley 90～150
Theater
Auditorium 180～280
Billiard room 75～110 Lounge (smoking
area) 250～360
Swimming
pool 160～260 Boudoir 80～120
Ball room 180～220 Hall and rest
room 70～100
Disco 220～320
Stadium
Arena 100～140
Karaoke hall 100～160 VIP Room 120～180
Playroom,
office 70～120 Lounge (smoking
area) 280～360
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Rest room 80～100 Lounge (no
smoking area) 160～250
Bank
Business hall 120～160
Lounge for
judges, coaches
and athletes
100～140
Office 70～120
Office
building
Deluxe office 120～160
Machine
room 120～160 Average office 90～120
Exhibition hall 150～200 Machine room 100～140
Auditorium 160～240 Meeting room 150～200
Multi-functional room 180～250 Reception room
(smoking area) 180～260
Library
Reading
room 100～160 Hall and rest room 70～110
Service
section 90～110 Office building 95～115
Stack room 70～90 Super high-rise building 105～145
Special
collection
room
100～150 Residen-
tial
building
Multi-storey
building 88～150
Restau-
rant
Hall 200～280 High-rise 80～120
Individual
dining room 180～250 Villa 150～220
Supermar-
ket
Service Hall 160～220
Meet and fish
area 90～160
Note: it is cited from Practical Heating and Air Conditioning Design Manual
Table 3.6.2 Cooling and Heating Load per Unit of Air Conditioning Area
Construction type
Heating and Cooling Load
（W/m2）Loading Conditions
Total
cool-
ing
ca-
pacity
Fres-
h air
Total
heat-
ing
ca-
pacity
Fresh
air
Light-
ing
(W/
m2)
Den-
sity
(p/
m2)
Fresh
air
（m3/
h）
Exfil-
tration
（h-
1）
Bank Business Hall 242 72 220 90 50 0.3 6 1.5
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Reception
Room 179 48 184 59 30 0.2 4 0.5
Depart-
ment
store
First Floor/
ground floor 355 97 246 107 80 0.8 8 2
Specialty
store 307 121 161 134 60 1 10 0.5
Mall 217 97 137 107 60 0.4 8 0.5
Super-
market
Food zone 212 72 195 80 60 0.6 6 0.5
Clothing zone 215 72 167 80 60 0.3 6 0.5
Hotel
Banquet hall 449 260 312 299 80 120 0
Fac-
ing
direc-
tion
of
guest
room
facing
direc-
tion
South 127
78
207
90
20 0.12 6 0.5
West 131 207 20 0.12 6 0.5
North 125 207 20 0.12 6 0.5
East 130 207 20 0.12 6 0.5
Eating
house Restaurant 286 144 228 179 40 0.6 12 0.5
Com-
munity
center
Study 233 121 228 149 20 0.5 10 0.5
Library Reading
Room 143 48 125 59 30 0.2 4 0.5
Hospi-
tal
Fac-
ing
direc-
tion
of
six–
bed
ward
South 91
48
112
59
15 0.2 4 0.5
West 110 112 15 0.2 4 0.5
North 79 112 15 0.2 4 0.5
East 96 112 15 0.2 4 0.5
Theatre Auditorium 512 362 506 448 25 1.5 30 0
Service Hall 237 78 219 90 30 0.3 6 0.5
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Table 3.6.3 Estimated Cooling Load per Unit Building Area
Construction type Cooling load（W/m2）Cooling load (W/m2）
Hotel 35～45 70～81
Large auditorium 56～72 /
Office building 42～54 84～98
Library, museum 18～32 35～41
Store 25～59 56～65 (only service hall)
Stadium
35～135
209～244 (as per the arena
area)
Stadium 105～122 (as per the total
area)
Cinema 42～68 84～98(only auditorium)
Theater / 105～128
Hospital 28～45 58～81
Deluxe restaurant / 105～116
Note: refer to It is cited from Design and Troubleshooting for Heating and Cooling Air
Conditioners.
(1)Take the lower limit when the total building area is less than 5000m2and take the upper
limit when the total building area is large than 10000 m2.
(2)The estimated load is directly indicates the required capacity of the air conditioners.
(3)Unless otherwise stated, the area always indicates the total building area no matter if air
conditioning is for local area or not.
3.6.1.2 Calculation of Indoor Load Demand
Indoor load demand = room area (㎡)× per unit load(W/㎡)
Note: our products that will be selected with cooling loads should fit for the on-site situation.
3.6.1.3 Selection of a Terminal Unit
Select a proper terminal unit in accordance with requirements on load noise and installation
space.
3.6.1.4 Selection of a Main Unit
A main unit should be selected based on its theoretically calculated cooling load.
3.6.1.5 Calculation of Heating Load
Calculate the heating loads of the main unit and terminal unit that have been selected, which
is not expected to be recognized until satisfying the requirements.
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3.6.1.6 A case for Selection
Background: there is an office building covering 12,000㎡totally with 10,500㎡to be air
conditioned, among which the big meeting rooms take up 500㎡, the small meeting rooms take
up 1,500㎡and office rooms take up 8,500㎡, and fresh air is required.
(1)Calculate the cooling load
1) By the estimated cooling load:
Big meeting rooms: 500×180（W/㎡）=90000W=90kW
Small meeting rooms: 150×240（W/㎡）=360000W=360kW
Offices: 8600×150（W/㎡）＝1290000W＝1290kW
Total: 90kW十360kW＋1290kW=1740kW
2) By the building area:
12000×98W＝1176kW
3) According to the calculation results of 1) and 2), cooling load 1740kW is selected.
(2)Calculate the heating load
By the estimated heating load:
12000×70=840000W=840kW
(3)Select the desired model and quantity
Look up the GREE Technical Guide Manual and it is concluded that 29 SQWRF60VM/
NaA-M meet the design requirement (cooling load: 1740kW,, heating load: 1885kW).
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4Unit Control
4.1 Schematic Diagram
Description:
(1)A water flow cutout is used to judge the water flow rate. When the flow rate is too low, it
will trip off, and the control board will send this signal to the display and the water pump.
Then, the display will tell there is an error, the water pump will stop and the unit will stop or
will not start.
(2)A high/low pressure cutout is used to judge the system pressure. When the system pres-
sure is too high/low, it will trip off, and the control board will send this signal to the display.
Then, the display will tell there is an error and the unit will stop or will not start
(3)An ambient temperature sensor is used to detect the temperature of the environment
where the unit is which will determine whether to start or stop the fan and determine the
steps of the electrostatic expansion valve when initializing. When this sensor fails, the con-
trol board will detect and send this signal to the display. Then, the display will tell there is
an error and the unit will stop or will not start.
(4)A discharge temperature sensor is used to detect the discharge temperature. When the
sensed temperature is too high or this sensor fails, the control board will detect and send
this signal to the display. Then, the display will tell there is an error and the unit will stop or
will not start.
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(5)An entering water temperature sensor is used to detect the temperature of the entering
water which will determine whether to start or stop the compressor and the auxiliary elec-
tric heater. When this sensor fails, all compressors of the unit will stop.
(6)Defrost temperature sensor is used to detect the liquid tube temperature of fins serving
the condenser, which will determine whether to start the fan. When the sensed tempera-
ture is too high or this sensor fails, the control board will detect and send this signal to the
display. Then, the display will tell there is an error and the unit will stop or will not start.
(7)An anti-freezing and overheating prevention temperature sensor is used to detect the
water temperature. When it fails, compressors and fans of the corresponding unit will stop.
(8)A leaving water temperature sensor is used to detect the leaving water temperature.
When this sensor fails, compressors and fans of the corresponding unit will stop.
(9)An air temperature sensor on shell-and-tube heat exchanger is used to detect the air tem-
perature. When this sensor fails, the compressor in a cooling state will have to be stopped
and the display will tell there is an error. If the sensor fails in a heating state, only the dis-
play will tell an error.
(10)An liquid temperature sensor on shell-and-tube heat exchanger is used to detect the
liquid temperature. When this sensor fails, the compressor in a cooling state will have to
be stopped and the display will tell there is an error. If the sensor fails in a heating state,
only the display will tell an error.
(11)A suction temperature sensor is used to detect the suction temperature. When this sen-
sor fails, the compressor in a cooling state will have to be stopped and the display will tell
there is an error. If the sensor fails in a heating state, only the display will tell an error.
(12)High-pressure sensor is used to detect the discharge pressure. When the sensed tem-
perature is too high, control the compressor to regulate the frequency of discharge.
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4.2 Operation Flowchart
4.2.1 Cooling
A Series Modular-type Air-cooled (Heat Pump) Chiller