Toshiba RBC-TWP30E Manual De Instalación página 8

RBCTWP30E.book Page 5 Thursday, June 24, 2004 5:39 PM
Additional Refrigerant Amount
<Formula for Calculating Additional Refrigerant Amount>
Do not remove the refrigerant even if the additional refrigerant amount becomes
minus result as a result of calculations by the following formula and operate the
air conditioner as it is.
Additional refrigerant amount (kg) = Main piping additional refrigerant
A: Additional refrigerant amount per meter of actual main piping length (kg)
B: Additional refrigerant amount per meter of actual branch piping length (kg)
L: Actual length of main piping (m)
a, b: Actual length of branch piping (m)
Standard piping length
Main piping
1100AT 18m
1400AT 18m
CAUTION
1. Be certain to write the additional refrigerant amount, pipe length (actual
length), head and other specification on the nameplate put on the outdoor unit
for recording.
2. Seal the correct amount of additional refrigerant in the system.
Gas Leak Test
• Use a leak detector manufactured specially for the HFC refrigerant (R410A, R134a, etc.) when testing R410A.
The sensitivity of leak detectors for previous HCFC refrigerants (such as R22) lowers to about 1/40 when used with
HFC refrigerants and these detectors cannot be used.
amount (kg) + Branch piping additional
refrigerant amount (kg)
= A × (L – 18) + B × (a + b – 4)
Additional refrigerant
amount per Meter (kg/m)
Branch
A
piping
2m 0.040
2m 0.040
5
Indoor unit B
Branch
piping
Branch pipe
b
B
0.020
0.040
Outdoor unit
Indoor unit A
a
Branch
piping
H
L
Main
piping