Gree LSQWRF35VM/NhA-M User manual

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Service Manual
A series modular air-cooled chiller (heat pump)
LSQWRF35VM/NhA-M
LSQWRF60WM/NhA-M

Contents
1 Product information ........................................................................................3
1.1 Introduction .............................................................................................3
1.1.1 Lineup .............................................................................................3
1.1.2 Nomenclature ..................................................................................3
1.1.3 Product features ..............................................................................4
1.1.4 Nominal operating conditions ..........................................................4
1.1.5 Operation range ..............................................................................5
1.2 Performance correction curves ...............................................................5
1.3 Working principle ....................................................................................6
1.4 Technical parameters ..............................................................................8
1.4.1 Electrical parameters ......................................................................8
1.4.2 Performance parameters ................................................................9
1.4.3 Scope of supply ............................................................................11
2 Unit control ...................................................................................................13
2.1 Schematic diagram ...............................................................................13
2.2 Operation flowchart ...............................................................................15
2.2.1 Cooling ..........................................................................................15
2.2.2 Heating .........................................................................................16
2.3 Key control logics ..................................................................................17
2.3.1 Cooling control ..............................................................................17
2.3.2 Heating control ..............................................................................17
2.3.3 Control to the compressor .............................................................18
2.3.4 Control to the fan ..........................................................................18
2.3.5 Control to the 4–way valve ............................................................18
2.3.6 Control to the water pump .............................................................18
2.3.7 Control to the electric expansion valve ..........................................18
2.3.8 Protection ......................................................................................18
2.4 Introduction to controller .......................................................................19
2.5 Smart management system ..................................................................19
2.5.1 Long-distance monitoring/BMS interface ......................................19

2.5.2 Network of the long-distance monitoring system ...........................19
2.5.3 Hardware ......................................................................................20
2.5.4 Model selection instructions ..........................................................21
3 Unit installation ............................................................................................23
3.1 Installation flowchart .............................................................................23
3.2 Preparations before installation ............................................................24
3.2.1 Precautions for installation ............................................................24
3.2.2 Importance of installation ..............................................................25
3.3 Installation instructions .........................................................................26
3.3.1 Outline dimensions .......................................................................26
3.3.2 Precautions for installation ............................................................28
3.3.3 Installation environment ................................................................28
3.3.4 Installation and service space .......................................................28
3.3.5 Installation foundation ...................................................................29
3.3.6 Handling and lifting .......................................................................29
3.3.7 Placement of the main unit ............................................................30
3.4 Piping and insulation .............................................................................30
3.4.1 Installation of the water system .....................................................30
3.4.2 Requirements on piping ................................................................32
3.4.3 Installation of the expansion tank ..................................................34
3.4.4 Installation of condensate pipes ....................................................35
3.5 Electrical connection .............................................................................37
3.5.1 Safety precautions ........................................................................37
3.5.2 External connection ......................................................................37
3.5.3 Specification of power supply ........................................................41
3.5.4 Wiring of the electric control cabinet .............................................41
3.5.5 Field wiring ....................................................................................43
3.5.6 Networking and wiring between units ............................................45
3.5.7 Jumpers ........................................................................................47
4 Test operation, troubleshooting and maintenance .......................................49
4.1 Commissioning .....................................................................................49

4.1.1 Flowchart of commissioning ..........................................................49
4.1.2 Safety precautions for commissioning ...........................................49
4.1.3 Preparation before commissioning ................................................49
4.1.4 Check before commissioning ........................................................49
4.1.5 Check for initial run .......................................................................50
4.2 Troubleshooting ....................................................................................52
4.2.1 Diagnostics ...................................................................................52
4.2.2 Flow chart of troubleshooting ........................................................54
4.3 Power distribution .................................................................................60
4.3.1 Power distribution logic .................................................................60
4.3.2 Introduction to main electric elements ...........................................60
4.3.3 Main board ....................................................................................61
4.4 Replacement of main parts ...................................................................63
4.4.1 Brief introduction ...........................................................................63
4.4.2 Replacement instructions ..............................................................64
4.5 Routine maintenance ............................................................................83
4.5.1 Repairs to refrigerant leakage .......................................................83
4.5.2 Air removal ....................................................................................84
4.6 Exploded views and part lists ................................................................85
4.7 Maintenance .........................................................................................91
4.7.1 Requirements for maintenance .....................................................91
4.7.2 Freeze protection in winter ............................................................93

1
Product
Product

2
SAFETY NOTICE
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.
PREFACE
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, we hereby instruct as below:
This 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 User's Manual, which if not abided, could result
in potential damage to the air conditioner, and even serious injury or death.

3
Product
1 Product information
1.1 Introduction
1.1.1 Lineup
Model
Cooling
capacity
Heating
capacity Power
supply Refrigerant Appearance
kW kW
LSQWRF35VM/NaA-M 32 36
380–415VAC
3Ph 50Hz
LSQWRF60VM/NaA-M 60 65 R32
1.1.2 Nomenclature
LS QW R F 60 V M / Na A - M
1234567 89 10
No. Code description Options
1Unit LS: chiller
2Compressor type QW: hermetic scroll/rotary type
3Unit function Omit: cooling only
R: heat pump
4Cooling method of condenser F: air-cooled
5Rated cooling capacity Rated cooling capacity = number (kW)
6System type Omit: fixed frequency, V: variable
frequency
7Assembly method M: modular
8Refrigerant type Na: R410A, Nh: R32
9Design code A-Z alphabetic order
10 Power code M: 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.
LSQWRF35VM/NhA-M indicates an inverter modular air-cooled chiller with a fully enclosed rotor-type
compressor, featuring 35kW cooling capacity and using R32 refrigerant.

4
1.1.3 Product features
The all-inverter modular air-cooled chillers work outstandingly by virtue of their major features stated
below.
(1) Excellent compatibility
The modular air-cooled chillers can be constructed of multiple single units with the same or different
structure or capability (35kW, 60kW,). 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.
(2) Comfort and energy saving
The inverter can quickly respond to load change and lead to decreased water temperature fluctuation
and better comfort.
(3) Ultra quiet operation
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-quiet
environment.
(4) Powerful self-protection
It is equipped with the top-end microcomputer control system which is capable of providing well-
rounded protection and self-diagnosis.
(5) High reliability
It is constructed of well-designed refrigeration parts and well-designed system, structure and electric
control, adequately guaranteeing reliable operation.
(6) Remote ON/OFF
The unit can be started or stopped by the ON/OFF key operation.
(7) Equilibrium running
It indicates each compressor will run alternately so as to extend their service life.
(8) 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.
1.1.4 Nominal operating conditions
Item
Water side Air side
Water ow
m3/(h·kW) Outlet temperature (°C) Dry bulb
temperature (°C)
Wet bulb
temperature (°C)
Cooling 0.172 7 35 -
Heat pump 45 7 6

5
1.1.5 Operation range
The unit should work within the specified operation range as shown in the table below:
Item
Water side Air side
Leaving water
temperature (°C)
Water temperature
difference (°C)
Ambient DB
temperature (°C)
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 pressure Maximum entering water pressure
Cooling 0.06MPa 1.6MPa
Heating
1.2 Performance correction curves
Here are curves indicating the unit performances in cooling and heating states.
Leaving water temperature (°C)
Leaving water temperature (°C)
Capacity (kW)
Ambient temperature (°C)
Capacity (kW)
Ambient temperature (°C)
LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M
Cooling
LSQWRF35VM/NaA-M, LSQWRF35VM/NhA-M
Heating
Leaving water temperature (°C)
Leaving water temperature (°C)
Capacity (kW)
Ambient temperature (°C)
Capacity (kW)
Ambient temperature (°C)
LSQWRF60VM/NaA-M, LSQWRF60VM/NhA-M
Cooling
LSQWRF60VM/NaA-M, LSQWRF60VM/NhA-M
Heating

6
◆R32: LSQWRF35VM/NhA-M
High-pressure switch
COOL
HEAT
Discharge temp.sensor
Compressor
4-way valve
Finned heat exchanger
Electric expansion valve
Vapor-liquid separator
High pressure sensor
Defrosting
temp.
Suction
temp.
Leaving water
temp.s ensor
Capillary tube
Solenoid valve
Stop valve
Stop valve
Water flow
switch
Shell-an d-t ube heat exchanger
Low-pressure switch for heating Low-pressure switch for cooling
sensor
sensor
Safety valve
Ambient
temp. sensor
Freeze protection
temp. sensor
Entering water
temp. sensor
Shell-and-tube
outlet temp. sensor
Shell-and-tube
inlet temp. sensor
1.3 Working principle
Here are diagrams below to present the constituents and refrigerant flow of the system.
Product