3 Piping work and refrigerant charge
Refrigerant charge
SMGB0091 rev.2 - 11/2015
49
3
Step 2: Additional refrigerant charge calculation for indoor unit (W
2
(kg))
When the RASC unit is combined with indoor units RPI-(8/10)HP, an additional refrigerant charge is required (W
2
) = 1 kg/
unit. For indoor units lower than 8 HP, an additional refrigerant charge is not needed.
Indoor unit capacity
Additional refrigerant charge
(W
2
(kg))
≥ 8 HP
1
< 8 HP
0
Step 3: Calculation of total additional refrigerant charge (W (kg))
For RASC-(4-6)HNPE units
Put weight W
1
and W
2
calculated in step 1 and step 2 into the following formula:
W
=
W
1
+
W
2
System example (W) =
+
=
kg
For RASC-(8/10)HNPE units
In case of RASC-(8/10)HNPE units, the following formula must be used:
W
=
W
1
+
W
2
-
C
System example (W) =
+
–
=
kg
C: Compensation value (kg) (Refer to the following table)
Model
Compensation value (C (kg))
RASC-8HNPE
1.6
RASC-10HNPE
2.0
!
C A U T I O N
Do not exceed the allowed maximum additional charge.
Step 4: Total refrigerant charge of the system (W
TOT
(kg))
The total refrigerant charge of this system is calculated by the following formula:
W
TOT
=
W
+ W
0
System example (W
TOT
) =
+
=
kg
Finally, record the refrigerant charge quantity in the F-Gas label in order to facilitate maintenance and servicing activities.
W
0
W
TOT
-W
0
W
TOT