Hitachi UTOPIA R32 Series Technical Catalogue

9 Piping work and refrigerant charge
Refrigerant charge amount
TCGB0136 rev.1 - 05/2021
92
9.4 Refrigerant charge amount
Although refrigerant has been charged into this unit, additional refrigerant charge is required according to piping length.
• The additional refrigerant quantity should be determined and charged into the system according to the following
procedure.
• Record the additional refrigerant quantity in order to facilitate maintenance and servicing activities.
! CAUTION
• When charging refrigerant, measure the amount precisely. Overloading or underloading of  refrigerant may cause compressor
problems.Iftheactualpipinglengthislessthan5mconsultyourdealer.
• Appropriate refrigerant
Therefrigerantusedineachunitisidentiedonthespecicationlabelandmanualsoftheunit.Hitachishallnotbeheldliableforany
failure,trouble,malfunctionoraccidentcausedbyunitsillegallychargedwithrefrigerantsotherthanthespeciedone.
• Consequences of charging non-specied refrigerant
• Itmaycausemechanicalfailure,malfunctionandotheraccidents.Itmaycauseoperationalfailureofprotectionandsafetydevicesof
airconditioners.Itmayalsocauselubricationfailureoftheslidingpartofthecompressorduetodeteriorationofrefrigerantoil.
• Inparticular,hydrocarbonrefrigerants(suchaspropane,R441A,R443A,GF-08,etc.)arenotallowed,sincethesearecombustible
andmaycausemajoraccidentssuchasreandexplosionincaseofimproperhandling.
• Onceanon-speciedrefrigeranthasbeencharged,nofurtherservicing(includingdrainingofrefrigerant)shallbeperformed,even
incaseofmalfunction.Improperhandlingofrefrigerantmaybeacauseofreandexplosion,andservicinginsuchcasesmaybe
consideredanillegalact.
• Endclientsandcostumersshallbeinformedthatservicingisnotapproved,andtheinstallerwhochargedthenon-speciedrefrigerant
shallbeaskedtoxtheunit.
9.4.1 Refrigerant charge before shipment (W
0
(kg))
W
0
is the outdoor unit refrigerant charge before shipment explained before, and it’s shown in the following table:
UTOPIA series 2
Model
Refrigerant charge before
shipment (W
0
(kg))
Additional refrigerant charge
(P) (g/m)
Maximum additional charge
(kg)
RAS-3HVNC1 1.9 40 1.2
RAS-4HVR(C/P)2E
3.0 45 2.9
RAS-5HVR(C/P)2E
RAS-6HVR(C/P)2E
RAS-4HR(C/P)2E
RAS-5HR(C/P)2E
RAS-6HR(C/P)2E
RAS-4HVN(C/P)2E
3.2 60 3.9
RAS-5HVN(C/P)2E
RAS-6HVN(C/P)2E
RAS-4HN(C/P)2E
RAS-5HN(C/P)2E
RAS-6HN(C/P)2E
9.4.2 Calculation method for the additional refrigerant charge
Calculate the additional refrigerant charge amount according to the following steps:

Step 1: Additional refrigerant charge calculation for liquid piping (W
1
(kg))
Outdoor units have been charged with refrigerant for 20 m of actual piping length: In systems with longer actual piping
length, an additional refrigerant charge is required.
Use the following formula:
W
1
= (L-20) x P
L: Total piping length (m)
P: Additional refrigerant charge (kg/m) (Refer to the “9.4.1Refrigerantchargebeforeshipment(W
0
(kg))” chapter)

Hitachi UTOPIA R32 Series Specifications

General

Brand	Hitachi
Model	UTOPIA R32 Series
Category	Air Conditioner
Language	English