Technical Information

Piping work and
refrigerant charge
TCGB0079 rev.0 - 01/2013
112
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
C A U T I O N
• DonotuserefrigerantpipesizesotherthanthoseindicatedinthisTechnicalCatalogue.Thediameterofthe
refrigerantpipesdependsdirectlyontheoutdoorunitcapacity.
• Iflargerdiametergasrefrigerantpipesareused,thecircuitlubricationoiltendstoseparatefromthegascar-
ryingit.Thecompressorwillbeseriouslydamagedduetoalackoflubrication.
• Ifsmallerdiametergasrefrigerantpipesareused,thegasorliquidrefrigerantwillhaveseriousdifcultiesin
circulating.Systemperformancewillbeaffected.Thecompressorwillrunundermoresevereconditionsthan
foreseenandwillbedamagedinashortspaceoftime.
9.1.2 Multikit or distributor selection
• Pipeconnectionsizeonoutdoorunits,indoorunitsandthemultikitordistributorvaryaccordingtothesys-
tem.
• Thesizesoftheindoorandoutdoorunitscouldbedifferent.Adjusttheareadapter(accessory)totheindoor
pipeconnectioninthesecases.
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.
TCGB0079_rev0_11-2012.indb 112 29/01/2013 14:27:28