Gree GRS-CQ8.0Pd/NaEK

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Design and Selection

5) Distance between the unit and the water trap (collector) should be within 15m. If the distance

exceeds 20m, then it is required to calculate the hydraulic power.

Main Page

Table of Contents2
Product6
Product Data6
- Lineup6
  - Main Unit6
  - Water Tank7
- Nomenclature7
  - Main Unit7
- Product Features8
  - General8
  - Features8
- Operating Principle9
  - Schematic Diagram9
- Technical Data10
Outline Dimensions16
- Outline Dimensions of Outdoor Unit16
- Outline Dimensions of Indoor Unit18
Explosive Views and Part Lists19
Supply Scope29
Design and Selection31
Installation Example31
Model Selection33
- Speculations of Power Supply33
- Operation Conditions33
- Flowchart of Model Selection34
- Design Principle34
Selection of the Underfloor Coils34
- Calculation of Unit Load for Floor Heating34
- Selection of Tube Spacing of the Underfloor Coils35
- Selection of Loop Quantity of Coils for each Room35
  - Type of Underfloor Coils35
  - Selection of Loop Quantity for each Room36
Quantity and Location of the Water Traps and Collectors36
- Design Requirements on Loop Quantity for Circulation Water36
- Requirements on Installation of the Water Trap (Collector)38
Section of FCU38
- FCU Type Selection38
- Matching of Capacity38
Selection of the Water Tank39
- Specifications of the Water Tank39
- Volume Selection of the Water Tank39
Examples for Model Selection40
- General Introduction to the Example Project40
- Heat Load Calculation40
- Model Selection42
Unit Control43
Integral Control Concept43
- Control Principle Diagram43
- Control Flowchart46
Main Control Logics46
- Cooling46
  - Control to the Compressor46
  - Freeze Protection47
- Heating47
- Water Heating47
  - Water Heating by the Main Unit47
  - Water Heating by the Solar System48
- Shutdown48
- Control to the Compressor48
- Control to the Fan48
- Control to the 4-Way Valve49
- Control to the Water Pump49
- Control the Electrostatic Expansion Valve49
- Protection Control49
Controller50
- External View50
  - Keys & Indicating Leds50
  - Standby Page and Homepage51
- Operation Instructions52
Unit Installation84
Installation Guides84
- Installation Positions of the Outdoor Unit85
- Installation Positions of the Indoor Unit85
- Matters Need Attention85
Filed Supplied Pipes and Valves85
Service Tools87
Instalaltion Instructions88
- Installation Examples88
- Pre-Installation89
- Selection of Installation Location89
- Outline Dimension of Outdoor Unit90
- Installation Clearance Data92
- Outline Dimension of Indoor Unit92
- Installation Clearance Data93
- Installation of Water Tank93
- Electric Wiring96
- Wiring of the Terminal Board99
- Wiring of the 2-Way Valve101
- Wiring of The3-Way Valve102
- Wiring of Other Auxiliary Heat Sources103
- Wiring of the Gate-Controller103
- Wiring of the Remote Air Temperature Sensor104
- Wiring of the Thermostat105
- Wiring of the Control107
Commissioning and Trial Run109
- Check before Startup109
- Test Run110
Test Operation & Troubleshooting & Maintenance112
Trial Run112
- Check for Wiring112
- Check for the Water System112
- Check for the Communication System112
- Trial Run113
Error Code List113
Flow Chart of Troubleshooting115
- Comp High-Pressure Protection E1115
- Comp Low- Pressure Protection E3116
- Comp Discharge Temp Protection E4117
- Overload Protection of Compressor or Driver Error118
- DC Fan Error EF119
- Temperature Sensor Error119
- Communication Malfunction E6120
- Capacity Switch Error (Code:"C5")121
Diagnosis of Driving121
- Diagnosis Flowchart of Driving of Single-Phase Unit and Three-Phase Unit121
Daily Maintenance and Repair126
- Daily Maintenance126
- Troubleshooting127
- Repair127
  - Key Components127
  - Charging and Discharging of Refrigerant129

Gree GRS-CQ8.0Pd/NaEK - Page 37

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