Hitachi RASC Serie Manual De Instalación Y Funcionamiento página 34

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 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"

NOTE:
Be careful that refrigerant and oil do not splash to the elec-
trical parts at removing the charge hoses.
The below figures show
examples of 3 and 5 HP
RASC-(3/5)HVRNE Case
11.7. ADDITIONAL REFRIGERANT CHARGE CALCULATION
See the following table:
•
O/U MODEL
Factory Charge (Kg)
RASC-3HVRNE
RASC-5HVRNE
RASC-10HRNE
Cooling Heating
Operation Operation
Low Pressure High Pressure
High Pressure Low Pressure
Exclussive for Vacuum Pump
and Refrigerant Charge
RASC-10HRNE Case
Wo:
l
Charge-less Length (m)
2.8 20
4.0 30
9.0 30
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
RASC-3HVRNE
RASC-5HVRNE
RASC-10HRNE

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
RASC-3HVRNE
RASC-5HVRNE
RASC-10HRNE
p
Compensating Rate (kg/m)
0.06
0.06
0.12
PMML0140A rev.1 - 07/2009
Wo Factory Charge
(Kg)
2.8
4.0
9.0
Refrigerant quantity
(Kg)
2.3
3.3
7.4
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