Refrigerant Charge Before Shipment (W (Kg)); Calculation Method For The Additional Refrigerant Charge - Hitachi UTOPIA RAS-4HVRP2E Service Manual

3 Piping work and refrigerant charge
Refrigerant charge
3.4.3 Refrigerant charge before shipment (W
W is the outdoor unit refrigerant charge before shipment explained before, and it's shown in the following table:
0
UTOPIA series 2
Refrigerant charge before
Model
RAS-3HVRC2
RAS-4HVR(C/P)2E
RAS-5HVR(C/P)2E
RAS-6HVR(C/P)2E
RAS-4HR(C/P)2E
RAS-5HR(C/P)2E
RAS-6HR(C/P)2E
RAS-4HVN(C/P)2E
RAS-5HVN(C/P)2E
RAS-6HVN(C/P)2E
RAS-4HN(C/P)2E
RAS-5HN(C/P)2E
RAS-6HN(C/P)2E

3.4.4 Calculation method for the additional refrigerant charge

Calculate the additional refrigerant charge amount according to the following steps:

Step 1: Additional refrigerant charge calculation for liquid piping (W
Outdoor units have been charged with refrigerant for 20 m of actual piping length: In systems with longer actual piping
length, an additional refrigerant charge is required.
Use the following formula:
TL: Total piping length (m)
P: Additional refrigerant charge (kg/m) (Refer to the
!
C A U T I O N
Do not exceed the allowed maximum additional charge.

Step 2: Charging work
Charge refrigerant into the system according to the instructions in the Service Manual.

Step 3: Total refrigerant charge of the system (W
The total refrigerant charge of this system is calculated by the following formula:
61 SMGB0136 rev.0 - 07/2021
Additional refrigerant charge
shipment (W (kg))
0
1.7
3.0
3.2
W = (TL-20) x P
1
"3.4.3 Refrigerant charge before shipment (W
W = W
TOT
System example (W ) =
TOT
(kg))
0
(P) (g/m)
30
45
60
(kg))
1
(kg))
TOT
+ W
0 1
+ =
Maximum additional charge
(kg)
0.9
2.9
3.9
(kg))" chapter)
0
kg
3