Hitachi RAS-(4-12)HNP(1)(E) - Compatibility with the Piping of Current Installations Where R22 or R407 C Is Used; Installation Procedure for Existing Pipes; Conditions to Use a Existing Pipes with Cleaning Process; Conditions to Use a Existing Pipes Without Cleaning Process

3 Piping work and
refrigerant charge
90
SMGB0087 rev.0 - 12/2013
3.6 CompatibilitywiththepipingofcurrentinstallationswhereR22orR407Cisused
 N O T E
ContactyourHitachidealerforspecicsupportonyourinstalation.
The new IVX Premium and IVX Standard are compatible with those installations that have been operating with R22 or
R407C. This allows installing the IVX Premium/Standard Outdoor Units, which operate with R410A, without having to
change piping installation.
3.6.1 Installation procedure for existing pipes
 N O T E
• Forsystemswithseveralindoorunits,branchpipesshallbechangedtoHitachi-speciedmodelforIVXPremiumand
Standard(R410A).
• ExistingoutdoorandindoorunitsforR22orR407Ccannotbeused.
1 Recover refrigerant (R22 or R407C):
a. Compressor of the existing unit is working
Pump down. Perform refrigerant recovery operation of existing air conditioner without stopping during 30 minutes
in cooling mode.
b. Compressor of the existing unit is not working
Recover refrigerant with a refrigerant recovery device.
2 Remove existing air conditioning system (Outdoor and Indoor unit).
3 For the existing pipes, proceed with one of the following operation:
a. Clean the existing piping (see section “3.6.1.1Conditionstouseaexistingpipeswithcleaningprocess”)
b. Connect renewal kit (optional accessory) (see section “3.6.1.2Conditionstouseaexistingpipeswithoutcleaning
process”)
4 Connect new UTOPIA IVX Premium/Standard series
5 Vacuum process.
6 Refrigerant charge (R410A)
Follow the normal process described for determinate if it is necessary additional refrigerant charge.
 C A U T I O N
RecoveringR22andR407Cismandatorytoremoveanexistingairconditionerandpiping.Donotventintotheatmos-
phere.
3.6.1.1 Conditions to use a existing pipes with cleaning process
After the piping cleaning process, follow the normal installation process as a new piping installed, considering all the res-
trictions and limitations. Special atention is required for control the piping thickness.
3.6.1.2 Conditions to use a existing pipes without cleaning process
A Renewal Kit (sold separately) can be used even in cases where there is a history of Compressor failure, allowing diver-
sion to existing piping without cleaning. Thus, the burden of installation works at renewal can be reduced.
Existing pipes can be used without cleaning if the following conditions are satised:
1 Install the Renewal kit (mandatory).
2 Maximum piping length 50 m. (If the pipe is longer than 50m, existing pipes can be used if cleaning is performed)
3 The capacity of the new unit must be equivalent at the one installed previously.
4 No corrosion No cracks, No scratches or deformations in existing pipes.
5 Dirt insider the pipes shall not be noticeable.
6 Piping thickness, Flare Nuts, gaskets, etc. shall be compliant products.
7 Flare shall be reprocessed.
8 Piping airtight or vacuuming shall be performed precisely as new piping.
3.6.2 When existing air-conditioner is a product of another manufacturer
Existing pipes made by other manufacturer can also be used if the following conditions satised:
1 For systems with several indoor units, branch pipes shall be changed to Hitachi-specied model.
2 Please perform a pipe cleaning.