Technical Information

Piping work and
refrigerant charge
TCGB0079 rev.0 - 01/2013
122
For all UTOPIA units except RAS-(8-12)HN(P/C)(E)
Use the following formula:
W
1
= (L-30) x P (*)
( N O T E
(*):IncaseofRAS-3HVNCunits,theunitischargedwithrefrigerantfor20m.Inthesecases,theformulaforcalculating
theadditionalrefrigerantchargeis:
W
1
= (L-20) x P
L: Total piping length (m)
P: Additional refrigerant charge (kg/m) (Refer to the Refrigerant charge before shipment chaper)
For UTOPIA units RAS-(8-12)HN(P/C)(E)
The additional refrigerant charge for RAS-(8-12)HN(P/C)(E) units must be calculated by multiplying the total piping
length of each diameter per its calculation factor according to the following table. The result is the additional refrigerant
charge for liquid piping
W
1
(Fill the table with the values)
Pipe size (mm) Additional refrigerant charge factor (kg/m)
Ø15.88 x 0.19
Ø12.7 x 0.12
Ø9.52 x 0.065
Ø6.35 x 0.065
Step 2: Additional refrigerant charge calculation for indoor unit (W
2
(kg))
When the outdoor unit is combined with indoor units RPI-(8/10)HP, it´s necessary an additional refrigerant charge (W
2
) = 1
kg/unit. For indoor units lower than 8 HP, an additional refrigerant charge it’s 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 all UTOPIA units except RAS-(8-12)HN(P/C)(E)
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 UTOPIA units RAS-(8-12)HN(P/C)(E)
In case of RAS-(8-12)HN(P/C)(E), it must be used the following formula:
W = W
1
+ W
2
- C
System example (W) = + – = kg
C: Compensation value (kg) (Refer to the following table)
Model Compensation value (C (kg))
RAS-8HN(P/C)E 1.6
RAS-10HN(P/E)E 2.0
RAS-12HN(P/C) 2.0
C A U T I O N
Donotexceedtheallowedmaximumadditionalcharge
TCGB0079_rev0_11-2012.indb 122 29/01/2013 14:27:31