Hitachi SET FREE MINI RAS-3 Manuel D'installation page 26

12
ADDITIONAL CHARGE OF REFRIGERANT R410A
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12. ADDITIONAL CHARGE OF REFRIGERANT R410A
Additional Charge of Refrigerant R410A
Although refrigerant has been charged into this unit, it is
required that additional refrigerant be charged according to
piping length and indoor units.
12.1. CALCULATION METHOD FOR ADDITIONAL REFRIGERANT CHARGE (W KG):
Additional refrigerant charge amount (W kg) required for
liquid piping, is defined according to piping length of the
System
Example of Installation RAS-3FSVNE + 4 indoor Units
Diagram:
Mark Description
Outdoor Unit

M(1/2/3) Multy kit
IU(1/2/3/4) Indoor Unit
Mark Dimension
a ≤ 25m (Position of outdoor unit is higher)
a
a ≤ 25m (Position of outdoor unit is Lower)
b b ≤ 10m
c c ≤ 10m
e Actual Lt (RAS-3FSVNE ≤ 50m / RAS-(4/5)FSVNE ≤ 75m)
L1/L2/L3/L4 Length between each Indoor unit and Multy kits
Calculate the additional refrigerant charge is required (for
liquid piping) according to piping length: (W1)
Example:
Piper Diameter Total Pipe
(mm) Lenght (m)
9.53 Ø 45m
6.35 Ø 5+3+3+5
Total Additional Charge Amount for Liquid Pipe = 1.67 kg
White table: (Fill the gaps with data of your System)
Piper Diameter Total Pipe
(mm) Lenght (m)
9.53 Ø
6.35 Ø
Total Additional Charge Amount for Liquid Pipe =
NOTE:
Is NOT necessary additional refrigerant charge for
indoor units
Additional
Sub Total
Charge (Kg/m)
Amount (Kg)
3Hp
0.03 45 x 0.03 = 1.35
0.02 16 x 0,02 = 0,32
Additional
Sub Total
Charge (Kg/m)
Amount (Kg)
3Hp 4/5Hp
0.03 0.06 x =
0.02 0.03 x =
kg
Main Points:
Determine the additional refrigerant quantity according to
-
the following procedure, and charge it into the system.
Record the additional refrigerant quantity to facilitate
-
service activities thereafter.
Total Refrigerant Charge of the System (Tw):
Tw= (Refrigerent charge in Outdoor unit Factory
Supplied)+ (Additional refrigerant Charge)
NOTE:
Refer to the chaper 11.4.4 " Refrigerent charge in
Outdoor unit (Factory Supplied)".
- Fill a label like this to remember the mind information
Example:
Additional refrigerant Charge
Refrigerent charge in Outdoor unit.
Date of Ref. Charge Work
Total Ref.charge of the System
White table: (Fill the gaps with data
Additional refrigerant Charge
Refrigerent charge in Outdoor unit
Date of Ref. Charge Work
Total Ref.charge of the System
NOTE:
Charge refrigerant (R410A) into the system according
to the instructions described in Chapter 13.
1.67
1.75
25/04/05
1.67 + 1.75 = 3.42Kg
/ /
+ = Kg