9 Piping work and refrigerant charge
Refrigerant pipe selection
TCGB0136 rev.1 - 05/2021
84
9.1 Refrigerant pipe selection
9.1.1 Pipe size selection
Select the pipe size in line with the following instructions:
1 Between the outdoor unit and the branch pipe (multikit): select the same pipe connection size as for the outdoor unit.
2 Between the branch pipe (multikit) and the indoor unit: select the same pipe connection size as for the indoor unit.
3 Between branch pipes (multikits): select the pipe connection size according the equivalent indoor unit size if adding
up the units after the branch pipe.
! CAUTION
• DonotuserefrigerantpipesizesotherthanthoseindicatedinthisTechnicalCatalogue.Thediameteroftherefrigerantpipesdepends
directlyontheoutdoorunitcapacity.
• Iflargerdiametergasrefrigerantpipesareused,thecircuitlubricationoiltendstoseparatefromthegascarryingit.Thecompressor
willbeseriouslydamagedduetoalackoflubrication.
• Ifsmallerdiametergas refrigerant pipesareused,the gas orliquidrefrigerantwill have seriousdifcultiesincirculating. System
performancewillbeaffected.Thecompressorwillrunundermoresevereconditionsthanforeseenandwillbedamagedinashort
spaceoftime.
9.1.2 Multikit or distributor selection
Pipe connection size on outdoor units, indoor units and the multikit or distributor vary according to the system.
The sizes of the indoor and outdoor units could be different.
9.2 Refrigerant piping range
9.2.1 Refrigerant piping length
The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart.
Keep the design point within the area of the chart, which is showing the applicable height difference according to piping
length.
4-6HP
DSW2
3HP
Height difference (m)
Total length between outdoor unit and
each indoor unit.
Setting
before
shipment
When outdoor unit
is installed higher
than indoor unit
When outdoor unit
is installed lower
than indoor unit
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