Selection Of Piping Material - Daikin LREQ-BY1 Installation Manual

6-1 Selection of piping material

• Make sure that the inner side and outer side of the piping used is clean and free of contaminants, such as sulphur, oxide, dust, chips, oil and fat, and water.
It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m.
• Use the following type of refrigerant piping.
Material: Seamless phosphorus deoxidized copper tube (C1220T-O for a maximum outer diameter of 15.9 mm and C1220T-1/2H for a minimum
outer diameter of 19.1 mm)
Refrigerant piping size and wall thickness: Decide the size and thickness from the following table.
(This product uses R410A. The withstand pressure of O type may be insufficient if it is used for piping with a minimum diameter of
19.1 mm. Therefore, be sure to use 1/2 H type with a minimum thickness of 1.0 mm.
If O type is used for piping with a minimum diameter of 19.1 mm, a minimum thickness of 1.2 mm will be required. In that case, be sure
to perform the blazing of each joint.)
• Be sure to perform piping work within the range specified in the
following table
Refrigerant piping length
Max. permissible LREQ5~20
one-way piping
length (equivalent
length)
Max. branch piping length (actual length)
Max. difference in unit below outdoor
height between unit
indoor and outdoor
unit above outdoor
units
unit
Refrigerant piping size
Outdoor unit side
LREQ5, LREQ6
LREQ8, LREQ10
LREQ12
LREQ15, LREQ20
Piping between
branching areas (B, b,
C, c)
Piping between
branching areas and
each unit
Installation manual
7
Te = –20~+10°C
a + b + c + d ≤130 m (d is d1 or d2 whichever is longer)
Te = –45~–20°C
a + b + c + d ≤100 m (d is d1 or d2 whichever is longer)
b + c + d ≤30 m (d is d1 or d2 whichever is longer)
H ≤35 m (Note)
H ≤10 m
Note: A trap is required at 5 m intervals from outdoor unit.
Piping size
Liquid pipe
50 m or less 50~130 m
Ø9.5 x 0.8 (O type)
Ø9.5 x 0.8 (O type) Ø12.7 x 0.8 (O type)
Ø12.7 x 0.8 (O type)
Ø12.7 x 0.8 (O type)
Select the piping from the following table in accordance with the total capacity of indoor units connected
downstream
Total capacity of indoor units after branching
less than 4.0 kW
4.0 kW over and less than 14.0 kW
14.0 kW or over
Total capacity of indoor units after branching
Medium temperature
(not less than –20°C)
less than 1.0 kW
1.0 kW over and less than 6.0 kW
6.0 kW over and less than 9.9 kW
9.9 kW over and less than 14.5 kW
14.5 kW over and less than 25.0 kW
25.0 kW over and less than 31.0 kW
31.0 kW or over
No size after branching can exceed the size of any upstream piping.
Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit
Gas pipe
Ø22.2 x 1.0 (1/2 H type or H type)
Ø28.6 x 1.0 (1/2 H type or H type)
Ø28.6 x 1.0 (1/2 H type or H type)
Ø34.9 x 1.2 (1/2 H type or H type)
Low temperature
(–20°C or less)
—
less than 2.3 kW
2.3 kW over and less than 4.4 kW
4.4 kW over and less than 6.4 kW
6.4 kW over and less than 10.8 kW
10.8 kW over and less than 13.4 kW
13.4 kW or over
Outdoor unit
Liquid piping
A B C D2
F E D1
H
Showcase
Unit
cooler
e
f d1
a b c d2
(Unit: mm)
Liquid pipe size
Ø6.4 x 0.8 (O type)
Ø9.5 x 0.8 (O type)
Ø12.7 x 0.8 (O type)
Gas pipe size
Ø9.5 x 0.8 (O type)
Ø12.7 x 0.8 (O type)
Ø15.9 x 1.0 (O type)
Ø19.1 x 1.0 (O type)
Ø22.2 x 1.0 (O type)
Ø28.6 x 1.0 (O type)
Ø34.9 x 1.2 (O type)
LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1D – 2016.11