Daikin VRV System - Procedure and tools for refrigerant piping work

• Systems • Installation
3
• Installation
Introduction
Procedure and tools for refrigerant piping work
Procedure
•Piping work for R-407C models partially differs from R-22 models in items and procedures of piping work and refrigerant charging due to different
component and higher pressure for R-407C. The chart below shows general work procedure for R-407C models.
Work items and precautions
Determination of work item Confirm the refrigerant is R-407C or R-22
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Prior to work Check the refrigerant to be used
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Preparing of working drawing (1) Check wall thickness of copper tube (Refer to the table "Wall thickness of refrigerant pipe")
(2) Maintain cleanliness inside of pipe.
(3) Make sure to conduct N
2
blowing when brazing is required.
(4) Pay attention on pipe flaring and oil to be coated on flared section.
(5) Be sure to use torque wrench.
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Mounting sleeves and inserts
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Installing indoor unit
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Refrigerant piping work
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Drain piping work
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Duct work (1) Make sure to conduct air tight test.
(2) Confirm the pressure of 3.3 MPa does not decrease for 24 hours.
(In case of design pressure of 3.3 MPa)
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Insulation work
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Electric work (Connection wiring / Power supply)
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Work Setting various items
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Foundation work for outdoor unit (1) Vacuum grade is -755 mmHg or lower
(2) Use dedicated vacuum pump
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Installation of outdoor unit
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Air tight test
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(1) Confirm the correct amount of refrigerant.
(2) Be sure to charge refrigerant in liquid phase.
(3) Use the dedicated gauge manifold and charging hose.
(4) The refrigerant amount to be charged is shown in the installation manual.
(5) Record the added refrigerant amount to the record sheet.
Vacuum drying
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Refrigerant additional charging
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Test run / Adjustment
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Preparing documents required before delivery
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Delivery / Operation instruction Preparation of documents and drawings in accordance with local codes and standard.
(V2349)