Midea LSBLG255/MZ Manuals

Manuals and User Guides for Midea LSBLG255/MZ. We have 1 Midea LSBLG255/MZ manual available for free PDF download: Technical & Service Manual

Midea LSBLG255/MZ Technical & Service Manual

Midea LSBLG255/MZ Technical & Service Manual (114 pages)

Water-cooled Screw Chiller LSBLGxxx/MZ series

Brand: Midea | Category: Chiller | Size: 8.83 MB

Table of Contents

Table of Contents
2
Installation Safety Considerations
3
Ⅰ. Safety Precautions

3
Ⅱ. Product

7
- External Appearance
  8
- Features
  9
- Specifications
  11
- Dual Heads
  12
- Outline Dimension
  13
- For Single Head Unit (LSBLG255~630/MZ)
  14
- Refrigeration System
  14
- Major System Components
  18
  - Single Compressor Parataxis Type Unit
    18
  - Advanced Twin Screw Compressor
    19
  - Compressor
    19
  - Dual Compressors Parataxis Type Unit
    19
  - Corrosion Allowances
    21
  - Lubricant
    21
  - Operating Life
    21
  - Pressure Vessels
    21
  - Condenser
    22
  - Evaporator
    22
  - Throttle Valve
    22
- Water Flow
  22
  - DX Type (Evaporator)
    23
  - Pressure Drop
    23
  - DX Type (Condenser)
    24
  - Connection to a Buffer Tank
    25
  - How to Calculate Minimum Volume in Pipeline System
    25
  - System Minimum Water Volume
    25
- Compressor Oil
  26
- Recommend Breaker Current
  26
- Unit Sound Levels
  26
- Operating Limits and Changes Water Temperature Curve
  27
- Operating Range
  27
- Changes Water Temperature Curve in the Operation
  28
- Capacity Table
  29
  - Optional Accessories
    34
  - Standard Accessories
    34
- Control Flow Chart
  35
- HMI+ Main Base Controller
  35
Ⅲ. Control

35
- Energy Adjustment
  36
- Start/Stop Process
  37
  - Cooling Start
    37
  - Cooling Stop
    38
- Sensors
  38
  - Temperature Sensors
    38
  - Thermistors
    38
  - Thermistor Replacement
    39
  - Pressure Sensors
    39
  - To Service Compressor Motor Thermistors
    39
- Parts Control
  40
  - Oil Heater Control
    40
  - Oil Heating Time Limits
    40
  - Pressure Sensor Control
    40
  - Controller Display
    41
  - Display
    42
  - Running Status Display
    43
  - Display All Status
    43
  - Controller Parameter Checking and Changing
    43
  - Checking or Changing Repair Parameters Step
    43
  - Checking or Changing Manufacturer Parameters Steps
    44
- Operation Part
  47
- Safety Protection
  62
- Electrical Data
  64
- Electrical Components Introduction
  64
- Electrical Parts Parameter Setting
  66
- Field Wiring
  69
  - Wiring Diagram
    69
  - Power Supply
    69
  - Cooling and Chilled Water Pump Wiring
    70
  - Cooling and Chilled Water Flow Switch Wiring
    72
  - Remote Control Wiring
    73
  - Customer Wiring Terminal
    73
  - Inside Electric Control Cabinet
    73
  - Safety Considerations
    74
- Unit Installation
  74
  - Fixation of Unit
    76
  - Spaces
    77
- Water Pipeline System Installation
  77
  - Water Quality Control
    77
  - Applicable Standard of Water Quality for the Unit
    78
  - Performance Adjustment Factors
    78
  - Ethylene and Propylene Glycol Factors
    78
  - Propylene Glycol
    79
  - Evaporator Side
    79
  - Fouling Factor
    79
  - Design of the Store Tank in the System
    79
  - Process Type Cooling
    80
  - Water Pipeline Installation
    80
- Wiring Installation
  84
- Pre Start-Up
  86
- Electrical System Inspection
  86
Ⅵ. Commissioning

86
- Refrigeration System Inspection
  87
- Start-Up
  90
- Daily Maintenance
  93
  - Annual Shutdown
    94
  - Recommended Maintenance Schedule
    94
  - Heat Exchangers
    95
  - Scheduled Maintenance
    95
  - Visual Inspection
    95
  - Chilled Water Cycling
    96
  - Electrical Control System
    96
  - Training User Operator
    96
  - Cleaning Heat Exchangers
    98
  - High Pressure at Full Load (Standard Unit)
    98
  - Low Pressure at Full Load (Standard Unit)
    98
- Maintenance
  98
  - Requirement for Cleaning and Maintenance
    99
  - Precautions of Chemical Cleaning
    100
  - Precautions on Usage of Detergent
    100
  - Refrigerant Circuit
    100
  - Water Treatment
    100
  - Checks on Refrigerant Charge
    101
  - Oil Change
    102
  - Oil Charging/Low Oil Recharging
    102
  - Pre-Cautions in Changing of Oil
    102
  - Moisture-Liquid Indicator
    103
  - Oil Filter Maintenance
    103
  - Pressure Relief Valves
    103
  - Relief Devices
    103
  - Phase Reversal/Phase Loss (Phase Protection)
    104
- Protection Items
  104
- Water Flow Failure (both Chilled Water and Cooling Water)
  104
Ⅷ. Troubleshooting

104
- High/Low Pressure Protection
  105
- Over/Under Voltage
  105
- Temperature Sensor Failure
  105
- Anti-Freeze Protection
  106
- Compressor Motor Protection
  106
- Mechanical Antifreeze Switch
  106
- Oil Level Protection
  106
- Troubleshooting
  107
Ⅸ

109
- Temperature-Resistance Characteristic Sheet for EXV Temp. Sensor
  111

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