Hitachi RAS-10FSXNS2E User Manual

12
PMML0628 rev.0 - 05/2023
3
PIPING WORK AND REFRIGERANT CHARGE
3.1 Connecon kit selecon ..................................................................................13
3.2 Pipe size selecon............................................................................................13
3.2.1 Size of pipes (Ø mm) ..............................................................................14
3.2.2 Examples ................................................................................................24
3.3 Pipe connecon ...............................................................................................25
3.3.1 Precauons for the installaon of the outdoor unit .............................26
3.3.2 Piping direcon ...................................................................................... 32
3.3.3 Piping connecon ..................................................................................34
3.3.4 Stop valve ............................................................................................... 34
3.4 Connecon scenarios ......................................................................................39
3.5 Air-Tight Test ....................................................................................................41
3.5.1 Tightening check of stop valves ............................................................41
3.5.2 Air-ght test method .............................................................................42
3.5.3 Insulaon work ......................................................................................43
3.6 Vacuuming .......................................................................................................43
3.6.1 Basic Method ........................................................................................43
3.6.2 Triple Evacuaon Method .....................................................................44
3.7 Charging work .................................................................................................. 44
3.7.1 Maximum permied concentraon of hydrouorcarbon (HFC)
refrigerant ..............................................................................................45
Piping work and refrigerant charge

Hitachi RAS-10FSXNS2E Specifications

General

Brand	Hitachi
Model	RAS-10FSXNS2E
Category	Heat Pump
Language	English