Hitachi YUTAKI RWM-2R1E Instruction Manual

8.4 REFRIGERANT CHARGE
! CAUTION
• Do not charge OXYGEN, ACETYLENE, or other ammable and
poisonousgasesintotherefrigerantbecauseanexplosioncanoccur.
Itisrecommended thatoxygen freenitrogenbecharged forthese
typesoftestscyclewhenperformingaleakagetestoranairtighttest.
Thesetypesofgasesareextremelydangerous.
• Insulate the unions and are-nuts at the piping connection part
completely.
• Insulate the liquid piping completely to avoid a decrease of
performance;ifnot,itwillcausesweatingonthesurfaceofthepipe.
• Charge refrigerant correctly. Overcharging or insufcient charging
couldcauseacompressorfailure.
• Checkforrefrigerantleakageindetail.Ifalargerefrigerantleakage
occurred, itwould cause difculty withbreathing or harmful gases
wouldoccurifarewerebeingusedintheroom.
• Ifthearenutistightenedtoohard,thearenutmaycrackaftera
longtimeandcauserefrigerantleakage.
8.5 CAUTION OF THE PRESSURE BY CHECK JOINT
When the pressure is measured, use the check joint of gas stop
valve (A), and use the check joint of liquid piping (B) in the gure
below.
At that time, connect the pressure gauge according to the
following table because of high pressure side and low pressure
side changes by operation mode.
Cooling
Operation
Heating
Operation
Check Joint for Gas Stop Valve “A” Low Pressure High Pressure
Check Joint for Piping “B” High Pressure Low Pressure
Check Joint for Liquid Stop Valve “C”
Exclusive for Vacuum Pump
and Refrigerant Charge
? NOTE
Becarefulthatrefrigerantandoildonotsplashtotheelectricalpartsat
removingthechargehoses.
C
B
A
There may be gas trapped
at the “O-ring screw” part,
which may produce a
sound when released upon
removal of the cap.
However, this is not a gas
leakage.
8.6 REFRIGERANT CHARGING QUANTITY
Outdoor Units has been charged with refrigerant for 15m
of actual piping length. An additional refrigerant charged is
required in systems with actual piping length longer than 15m.
1 Determine an additional refrigerant quantity according to the
following procedure, and charge it into the system.
2 Record the additional refrigerant quantity to facilitate service
activities thereafter.
! CAUTION
• When charging refrigerant accurately measure refrigerant to be
charged.
• Overchargingorunderchargingofrefrigerantcancausecompressor
trouble.
• Incaseofactualpipinglengthlessthan5m,consultyourdistributor.
W
0
(kg) is the outdoor unit refrigerant charge before shipment
explained before, and it’s shown in the following table:
Model
Refrigerant
charge before
shipment
(W
0
(kg))
Additional
refrigerant
charge (P)
(g/m)
Maximum
additional
charge
(kg)
RAS-4WHVNPE 3.3 60 3.9
RAS-5WHVNPE 3.4 60 3.9
RAS-6WHVNPE 3.4 60 3.9
RAS-4WHNPE 3.3 60 3.9
RAS-5WHNPE 3.4 60 3.9
RAS-6WHNPE 3.4 60 3.9
RAS-8WHNPE 5.0 65 10.3
RAS-10WHNPE 5.3 65 12.1
Additional refrigerant charge calculation method
For all units use the following formula:
W
1
= (L-15) x P
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0372B rev.5 - 01/2021
11
EN

Hitachi YUTAKI RWM-2R1E Specifications

General

Brand	Hitachi
Model	YUTAKI RWM-2R1E
Category	Air Conditioner
Language	English