Field Refrigerant Piping; Installation Of Outdoor Units - Daikin R-410A Installation Manual

REFNET Pipe System
3.2

Field Refrigerant Piping

3.2.1 Heat Pump Series
1. The following materials should be used for all refrigerant piping:
Materials: Deoxidized phosphorous seamless copper pipe or equivalent
2. The tips for insulation
Both Gas and liquid piping must be insulated.
Materials: Glass fiber or heat resistant polyethylene foam
Thickness: 1/2 inch or more
Heat resistance: Gas pipe : 250°F or more / Liquid pipe : 160°F or more
Insulation of single pipe only
3.2.2 Heat Recovery Series
Suction, discharge gas piping, and liquid piping must be insulated.
Example of thermal insulation work:
3 piping section (between outdoor unit and BS unit)
6
Insulation of both liquid and gas pipe
2 piping section (between BS unit and indoor unit)
EDUS39-605

Installation of Outdoor Units