34
PMML0140A rev.1 - 07/2009
REFRIGERANT PIPING &
REFRIGERANT CHARGE
11.5. 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”
Exclussive for Vacuum Pump
and Refrigerant Charge
NOTE:
Be careful that refrigerant and oil do not splash to the elec-
trical parts at removing the charge hoses.
The below gures show
examples of 3 and 5 HP
RASC-(3/5)HVRNE Case
RASC-10HRNE Case
11.6. REFRIGERANT CHARGE QUANTITY
RASC units has been charged with refrigerant for 20 m (RASC-
3HVRNE) or 30 m (RASC-5HVRNE) of pipe length. It is required
that additional refrigerant be charged according the piping
length if it is longer than 20 m (RASC-3HVRNE) or 30 m (RASC-
5HVRNE).
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
RASC unit Factory Refrigerant charge (Wo Kg) is the next:
•
O/U MODEL
Wo Factory Charge
(Kg)
RASC-3HVRNE 2.8
RASC-5HVRNE 4.0
RASC-10HRNE 9.0
CAUTION:
In case of the actual piping length is less than 5 m, total
refrigerant quantity should be according to the below table:
O/U MODEL
Refrigerant quantity
(Kg)
RASC-3HVRNE 2.3
RASC-5HVRNE 3.3
RASC-10HRNE 7.4
11.7. ADDITIONAL REFRIGERANT CHARGE CALCULATION
See the following table:•
O/U MODEL
Wo:
Factory Charge (Kg)
l
Charge-less Length (m)
p
Compensating Rate (kg/m)
RASC-3HVRNE 2.8 20 0.06
RASC-5HVRNE 4.0 30 0.06
RASC-10HRNE 9.0 30 0.12
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