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.
• 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.
8.5 REFRIGERANT CHARGING QUANTITY
In case of the actual piping length is more than the specified length, the additional refrigerant quantity should be charged according
to the table below:
Outdoor unit refrigerant
charge (kg)
Chargeless length (m)
Additional refrigerant charge (P) (g/m)
Max additional
charge (kg)
1 IU
2 IU
1 IU
2 IU
RAS-2HVNP1
1.6
30
0
30
30
1.5
RAS-2.5HVNP1
1.6
30
0
30
24
1.2
RAS-3HVNC1
1.9
20
20
40
40
1.2
RAS-3HVRNS3
1.9
20
20
40
40
1.2
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.
• Charge refrigerant correctly. Overcharging or insufficient charging
could cause a compressor failure.
8.6 CAUTION OF THE PRESSURE BY CHECK JOINT
When the pressure is measured, use the check joint of gas stop
valve, and use the check joint of liquid piping 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.
Cooling
Operation
Heating
Operation
Check Joint for Gas Stop Valve
Low Pressure
High Pressure
Check Joint for Liquid Stop Valve
Exclussive for Vacuum Pump
and Refrigerant Charge
?
N O T E
Be careful that refrigerant and oil do not splash to the electrical parts at
removing the charge hoses.
Stop valve (liquid)
Stop valve (gas)
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
Pipe Length ≤ 5m
Pipe Length ≥ 30m
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0398B rev.0 - 11/2015 - P5416651
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