15
1.8 Refrigerant piping – Selecting branches and permissible
lengths
Piping specifications (Use the following pipes)
•
Piping material: Phosphate deoxidized copper seamless air-conditioning pipe JIS H3300, C1220T
(Japanese technical standard) or equivalent.
•
Refrigerant pipe specifications: Outer diameter
×
thickness (mm)
ø 6.4 × 0.8
ø 9.5 × 0.8
ø 12.7 × 0.8
ø 15.9 × 1.0
ø 19.1 × 1.0
ø 22.2 × 1.0
ø 25.4 × 1.0
ø 28.6 × 1.0
ø 31.8 × 1.1
ø 38.1 × 1.35
(1)
【
Main piping
】
Between outdoor unit and first branch (A on the figure)
Outdoor unit
P224
P280
P355
Vapor line (mm)
Ø 19.1
Ø 22.2
Ø 25.4
Liquid line (mm)
Ø 9.5
Ø 12.7
(2) Main piping
】
Between outdoor unit and first branch (A on the figure)
Total capacity of downstream
indoor units (kW)
fino a
22.4kW
da 22.4kW
a 33.0kW
da 33.0kW
a 47.0kW
da 47.0kW
a 71.0kW
da 71.0kW
o più
Vapor line (mm)
Ø 15.9
Ø 22.2
Ø 28.6
Ø 31.8
Liquid line (mm)
Ø 9.5
Ø 12.7
Ø 15.9
Ø 19.1
(3) Piping between branch and indoor unit (a, b, c, d, e and f on the figure)
Indoor unit
P22, 28, 36, 45, 56
P71, 80, 90, 112, 140
P224
P280
Vapor line (mm)
Ø 12.7
Ø 15.9
Ø 19.1
Ø 22.2
Liquid line (mm)
Ø 6.4
Ø 9.5
•
Make sure that total extension refrigerant piping lenght is 520 m. or less.
•
If the refrigerant piping equivalent length exceeds 100 m, use pipes with diameters larger by
one rank indicated in “4-3. Refrigerant piping installation specifications“ on the previous page
for the main liquid and vapor piping. Example: ø 12.7
→
ø 15.9.
•
This unit uses R410A. Limit pressure of O material pipe with ø 19.1 diameter or larger is
insufficient. Be sure to use 1/2H or H material pipes with minimum thickness or thicker. For
ø 19.1 pipe only, however, as long as the thickness is 1.05 mm or greater, O materials can
be used.
•
Method of refrigerant piping can be selected from line branching, header branching, and
line-header combined branching. Select the proper method according to the layout of indoor
units.
•
Refrigerant piping length and the height difference between indoor units should be arranged
as short as possible.
•
Re-branching after the header branching is not allowed.
CAUTION
Outdoor unit
First branch
Indoor
Unit 1
Indoor
Unit 2
Indoor
Unit 3
Indoor
Unit 4
Indoor
Unit 5
Indoor
Unit 6
Содержание AXGP224E1
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