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REFRIGERANT CHARGE
9 REFRIGERANT CHARGE
!
D A N G E R
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.
9.1 CAUTION OF THE PRESSURE BY CHECk jOINT
RAS-(4-6)FS(V)NME
When the pressure is measured,
use the check joint of gas stop
valve (A), and use the check joint
(B). Connect the pressure gauge
according to the following table
because of high pressure side
and low pressure side changes by
operation mode.
A
For gas stop valve
B
For piping
C
For liquid stop valve
9.2 ADDITIONAL REFRIGERANT CHARGE CALCULATION
Although refrigerant has been charged into this unit in advance
(W
(kg)), additional refrigerant charge (W (kg)) is required
0
according to piping length.
Ensure that the total additional refrigerant charge quantity
should not exceed the max. additional charge quantity shown in
the table below.
Refrigerant charge
Model
before shipment (W
RAS-4FS(V)NME
RAS-5FS(V)NME
RAS-6FS(V)NME
RAS-8FSXNME
RAS-10FSXNME
RAS-12FSXNME
Determine the additional refrigerant quantity according to the
following procedure, and charge the system with it. Record
the additional refrigerant quantity to facilitate maintenance and
servicing activities thereafter.
9.2.1 For RAS-(4-6)FS(V)NME
Pipe diameter
Total piping
(mm)
length (m)
Ø12.70
___ m
Ø9.52
___ m
Ø6.35
___ m
Total additional charge for liquid piping
31
PMML0511 rev.1 - 06/2019
Cooling
Heating
Low pressure
High pressure
High pressure
Low pressure
Exclusive for vacuum pump and
refrigerant charge
Maximum additional
(kg))
charge (kg)
0
3.7
9.3
4.1
8.9
4.1
8.9
4.2
26.1
5.5
26.1
5.5
26.1
Refrigerant amount
Additional
for 1m pipe (kg/m)
charge (W)
x 0.085
=_____kg
x 0.050
=_____kg
x 0.020
=_____kg
=_____kg
!
C A U T I O N
Charge the correct refrigerant quantity according to the description of
label at the inside of service cover. Overcharging or insufficient charging
could cause a compressor failure.
RAS-(8-12)FSXNME
B
To measure the pressure use the
check joints (A) and (B). Connect
C
the pressure gauge according to
the following table.
A
?
N O T E
For all models, be careful that refrigerant and oil do not splash to the
electrical parts at removing the charge hoses.
Total refrigerant charge in the system
Total refrigerant charge = W + W
9.2.2 For RAS-(8-12)FSXNME
W1. For liquid piping (W1 kg)
Pipe diameter
Total piping
(mm)
length (m)
Ø15.88
___ m
Ø12.70
___ m
Ø9.52
___ m
Ø6.35
___ m
Total additional charge for liquid piping
?
N O T E
In the case that the quantity calculated above is less than the minimum
quantity indicated in the table below, adopt the quantity in the table below
as the additional refrigerant quantity for piping liquid, regardless of the
piping length.
Model
Minimum additional refrigerant charge of
OU (kg)
A
B
0
Refrigerant amount for
Additional
1m pipe (kg/m)
charge
x 0.17
=_____kg
x 0.11
=_____kg
x 0.056
=_____kg
x 0.024
=_____kg
=_____kg
RAS-(8-12)FSXNME
2.0
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