Refrigerant Piping Selection - Hitachi RAS-5HVRNM1E Service Manual

3 Piping work and
refrigerant charge
N O T E
• L & H are the length & height indicated in the above chart.
• For twin, the length is the distance between the outdoor unit and the farthest indoor unit.
• Piping length after branch pipe (B,C & D):
1 After branch pipe B,C & D, the pipe length should be shorter than 10 m.
2 All branch pipe, B, C & D (it depend of case), should be balanced.
B & C difference

3.3.3 Refrigerant piping selection

Select the piping connection sizes according to the following procedures
• Between outdoor unit and branch pipe: Select the same pipe connection size as the pipe size of the outdoor unit.
• Between branch pipe and indoor unit: Select the same pipe connection size as the pipe size of the indoor unit.
Piping connection size of outdoor unit, indoor unit and distributor
Outdoor Unit
Liquid Piping
RAS-3HVRNME
RAS-4H(V)RNM1E
RAS-5H(V)RNM1E
RAS-6H(V)RNM1E
RAS-8HRNM
RAS-10HRNM
RAS-12HRNM
N O T E
The sizes of the indoor and outdoor units are different. Adjust the flare adapter (accessories) to the joint part of
the indoor piping.
• (1) Select the size of piping ø12.7 when the length is over 70 m (only for RAS-8HRNM).
• (2) If using ø28.60, the actual length is reduced to 75 m.
• If using ø22.20, the actual length is reduced to 100 m., but with a significant reduction in capacity.
The following Multikits can also be used for RAS-(8-12)HRNM.
Outdoor Unit
RAS-8HRNM
RAS-10HRNM
RAS-12HRNM
66
SMGB0060 rev. 1- 12/2010
Twin
≤ 8 m
Pipe Size
Gas Piping
Ø9.53 Ø15.88
Ø9.53 Ø15.88
Ø9.53 Ø15.88
Ø9.53 Ø15.88
(1) (2)
Ø9.53 Ø25.40
(2)
Ø12.70 Ø25.40
(2)
Ø12.70 Ø25.40
Triple
B,C & D difference
≤ 6 m
Multikit & Distributor
Twin Triple
TE-03N / E-102SN2
TE-56N / E-102SN2 TRE-06N
TE-56N / E-102SN2 TRE-06N
TE-56N TRE-06N
TE-08N / E-162SN2 TRE-810N
TE-10N / E-162SN2 TRE-810N
TE-10N / E-162SN2 TRE-810N
Multikits
E-162SN-102SN
E-162SN-102SN
E-162SN-102SN
Quad
— —
—
TRE-56N+(TE-03N or
(3)
TE-56N)
TRE-56N+(TE-03N or
(3)
TE-56N)
QE-810N
QE-810N
QE-810N