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Instructions
Annex D - Outline of installation
Flow of installation work and points to note during installation
<Refrigerant piping work, airtight test, vacuum drying and additional refrigerant charge>
Point to note
1. Conventional R410A application products are absolutely incompatible with R744 application products.
2. Replace all measuring instruments and tools directly in contact with the refrigerant with those special to R744.
Care must be taken not to mistake materials, measuring instruments and tools in use.
<<Installation work ow>>
Con rm refrigerant
Create Installation map
Pre-construction for piping
Indoor unit delivery/preparation
Prepare the installation
Refrigerant piping work
(Dry, clean, non-leak)
Insulationv work
Foundation work of Condensing unit
Installation of Codensing unit
Electric & control wiring work
Charge refrigerating machine oil
Charge refrigerant
Set up Dip switch
Test run (Operation check)
1 Refrigerant charge
2 Refrigerant oil
3 Oil return operation
56 | AN405821998738en-000102 - 118A5495A
Plan the project
Airtight test
Vacuum drying
Install Panel
Test run
<< Difference of work >>
R744
R744 (High pressure side: Max. 140 Bar,
Medium/low pressure side: Max. 80 Bar)
(
) indicates the airtight test pressure.
mark: (Change of standards)
mark: (More thorough, strict observation than conventional)
Con rm that it is an R744 application product.
Measuring instruments, tools (Special to R744)
1. Select proper piping materials, wall thickness.
2. Thorough control of cleaning pipe inside
3. Nitrogen gas ow is a must for brazing.
4. Flashing pipe inside is a must after brazing.
5. Strict use of torque wrench
Con rm that it is an R744 application product.
The product is absolutely incompatible.
1. Airtight test pressure
R744
Medium/low pressure side
Max. 80 Bar × 24 hr
1. Evacuate for 2 to 3 hr.
(Basic is -1 Bar or under.)
2. Use vacuum pump adaptor.
1. Con rmation of refrigerant (bomb) in use
2. Must charge refrigerant in liquid state.
3. Use manifold valve, charge hose special to R744.
4. Use device special to R744 at gas leak test.
Delivery (Hand over) and instruction
© Danfoss | Climate Solutions | 2023.02 | LCA012A024
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