Section 2: Design Of 3Way Vrf System - Panasonic U-72MF1U9 Technical Data Manual

Contents
1. Model Selecting and Capacity Calculator ........................................................................ 2-2
1-1. Operating Range .............................................................................................................
1-2. Procedure for Selecting Models and Calculating Capacity ...........................................
1-3. Tubing Length .................................................................................................................
1-4. Tubing Size ......................................................................................................................
1-5. Installation Standards ......................................................................................................
1-6. Straight Equivalent Length of Joints ...............................................................................
1-7. Check of limit density ....................................................................................................
- 1 . 8 Calculation of Actual Capacity of Indoor Unit
- 1 . 9 Capacity Correction Graph According to Temperature Condition
1-10. Capacity Correction Graph According to Tubing Length and Elevation Difference
2. System Design ................................................................................................................. 2-18
2-1. System Example............................................................................................................
2-2. Example of Tubing Size Selection for Extension and Additional Charge Amount
2-3. Installing Distribution Joint
3. Electrical Wiring ..............................................................................................................
3-1. General Precautions on Wiring .....................................................................................
3-2. Recommended Wire Length and Wire Diameter for Power Supply System ..................
3-3. Wiring System Diagrams ...............................................................................................
3-4. Important Note When Wiring for Common Type ..........................................................
3-5. Important Note When Wiring for Y1 Type ....................................................................
4. Installation Instructions ..................................................................................................
Outdoor Unit ..................................................................................................................
4-1. Selecting the Installation Site for Outdoor Unit ............................................................
- 4 . 2 Removing Fin Guard for Heat Exchanger
- 4 . 3 Shield for Horizontal Exhaust Discharge
- 4 . 4 Installing the Outdoor Unit in Heavy Snow Areas
4-5. Precautions When Installing in Heavy Snow Areas ......................................................
4-6. Dimensions of Wind Ducting
Reference diagram for air-discharge chamber (field supply).......................................
4-7. Dimensions of Snow Ducting
Reference diagram for snow-proof ducting (field supply) ............................................
4-8. Transporting the Outdoor Unit .....................................................................................
4-9. Installing the Outdoor Unit ............................................................................................
4-10. Remove the Brackets Used for Transport ..................................................................
4-11. Routing the Tubing ......................................................................................................
4-12. Prepare the Tubing ......................................................................................................
4-13. Connect the Tubing .....................................................................................................
Indoor Unit
* Refer to the 2WAY VRF SYSTEM TECHNICAL DATA (TD831157)
5. HOW TO PROCESS TUBING ..........................................................................................
5-1. Connecting the Refrigerant Tubing ..............................................................................
5-2. Connecting Tubing Between Indoor and Outdoor Units .............................................
5-3. Insulating the Refrigerant Tubing .................................................................................
5-4. Taping the Tubes ..........................................................................................................
5-5. Finishing the Installation ................................................................................................
6. AIR PURGING .................................................................................................................
Air Purging with a Vacuum Pump (for Test Run) Preparation ..................................
7. Optional Parts ..................................................................................................................
7-1. Distribution Joint Kits .....................................................................................................
7-2. Solenoid Valve Kit for 3WAY VRF System ......................................................................
2. DESIGN OF 3WAY VRF SYSTEM
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Design of 3WAY VRF SYSTEM
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