Hitachi UTOPIA ES Serie Bedienungsanleitung Seite 20

REFRIGERANT PIPING & REFRIGERANT CHARGE
8.4 REFRIGERANT CHARGE
!
C A U T I O N
• Do not charge OXYGEN, ACETYLENE, or other flammable 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 flare-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.
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 figure
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.
Check Joint for Gas Stop Valve "A"
Check Joint for Piping "B"
Check Joint for Liquid Stop Valve "C"
8.6 REFRIGERANT CHARGING QUANTITY
Outdoor Units has been charged with refrigerant for 30m
of actual piping length. An additional refrigerant charged is
required in systems with actual piping length longer than 30m.
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.
!
C A U T I O N
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 (kg) is the outdoor unit refrigerant charge before shipment
0
explained before, and it's shown in the following table:
Refrigerant charge
Model before shipment
(W
RAS-5H(V)RNS2E /
RAS-6H(V)RNS2E
10 PMML0394B rev.0 - 11/2015
Cooling Heating
Operation Operation
Low Pressure High Pressure
High Pressure Low Pressure
Exclusive for Vacuum Pump
and Refrigerant Charge
Additional
refrigerant charge
(P)
(kg))
(g/m)
0
2.9 60
• Charge refrigerant correctly. Overcharging or insufficient charging
could cause a compressor failure.
• Check for refrigerant leakage in detail. If a large refrigerant leakage
occurred, it would cause difficulty with breathing or harmful gases
would occur if a fire were being used in the room.
• If the flare nut is tightened too hard, the flare nut may crack after a
long time and cause refrigerant leakage.
?
N O T E
Be careful that refrigerant and oil do not splash to the electrical parts at
removing the charge hoses.
The below figures show examples of 3 and 5 HP
RAS-3H(V)RNM2E
Setting of Pipe Length DSW
DSW2 setting will be required only when the refrigerant pipe
length is shorter than 5 m or longer than 30 m. Pipe length
setting shall be performed as shown below.
(The  side in the table below shows the DSW location)
DSW2 on Outdoor PCB1
Factory setting Factory setting
Pipe Length 5 m or
RAS-5H(V)RNM2E
Factory setting
Pipe Length 30 m or
shorter longer