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Refrigerant Piping
l
The diagram below should be used in conjunction with the table.
l
All T-Joints to be sourced locally.
Maximum Piping Lengths
Outdoor Unit
Indoor Unit 2
Indoor Unit 1
Branch
Pipes
Branch
Pipes
T-Joints
Main Pipes
* Ø22 (7/8”) should be used when the maximum pipe length exceeds 30m
Pipe Sizes
Maximum Pipe Length:
This is the sum of the main and both branch pipes and is used when
calculating the refrigerant charge.
Equivalent Pipe Length:
This is used as the maximum resistance which can be imposed on a system
and takes into account pipe fittings and bends.
Additional Refrigerant:
Only required if Maximum Pipe Length (L1+ L2+ L3) is greater than 20m,
please refer to page 28 entitled ‘Additional Refrigerant’ for more details.
Outdoor Unit
Indoor Unit Size
Main Pipes (Outdoor to T-Joint)
264
164
134
134
104
Gas
Liquid
Gas
Liquid
Branch Pipes (T-Joint to Indoor)
Ø19.1* (3/4”)
Ø19.1* (3/4”)
Ø15.9 (5/8”)
Ø15.9 (5/8”)
Ø12.7 (1/2”)
Ø9.5 (3/8”)
Ø6.4 (1/4”)
Ø6.4 (1/4”)
Ø6.4 (1/4”)
Ø6.4 (1/4”)
Ø15.9 (5/8”)
Ø12.7 (1/2”)
Ø12.7 (1/2”)
Ø12.7 (1/2”)
Ø12.7 (1/2”)
Ø9.5 (3/8”)
Ø9.5 (3/8”)
Ø9.5 (3/8”)
Ø9.5 (3/8”)
Ø6.4 (1/4”)
RAV-464AH8-PE
RAV-364AH8-PE
RAV-264AH8-PE
RAV-264AH-PE
RAV-164AH-PE
Outdoor
Unit
Pipe Length (of one pipe)
Maximum Pipe
Length
L1+L2+L3
Difference in Height
Outdoor Unit to Indoor Unit
Branch Length
L2+L3
Difference in
Equivalent
Lengths
L3-L2
Indoor Unit
Situated
Higher
(H)
Indoor Unit
Situated
Lower
(H)
Height
Difference
Between
Indoor Units
H
Maximum
Bend
Quantity
Up to 50m
4m to 10m
Up to 50m
4m to 10m
Up to 30m
4m to 10m
Up to 30m
4m to 10m
Up to 30m
4m to 10m
Up to 10m
Equivalent
Up to 10m
Equivalent
Up to 10m
Equivalent
Up to 10m
Equivalent
Up to 10m
Equivalent
Up to 20m
Up to 50m
Up to 20m
Up to 50m
Up to 15m
Up to 30m
Up to 15m
Up to 30m
Up to 15m
Up to 30m
Up to 0.5m
10
Up to 0.5m
10
Up to 0.5m
10
Up to 0.5m
10
Up to 0.5m
10
RAV-464AH8-PE
RAV-364AH8-PE
RAV-264AH8-PE
RAV-264AH-PE
RAV-164AH-PE
Heronhill - for all your Toshiba requirements
Tel: 01823 665660
www.heronhill.co.uk
Fax: 01823 665807