Daikin LREQ5B7Y1, Installation Manual

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LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74302-1 – 2012.06
Installation manual
6
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
one-way piping
length (equivalent
length)
LREQ5~20 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)
Max. branch piping length (actual length) b + c + d ≤ 30 m (d is d1 or d2 whichever is longer)
Max. difference in
height between
indoor and outdoor
units unit below outdoor
unit H ≤ 35 m (Note)
unit above outdoor
unit H ≤ 10 m
Note: A trap is required at 5 m intervals from outdoor unit.
d1
e
B
d2
C
c
D1 F E
f
D2 A
b a
Outdoor unit
Showcase
Unit
cooler
Gas piping
Liquid piping
H
Refrigerant piping size (Unit: mm)
Outdoor unit side Piping size
Liquid pipe
Gas pipe
50 m or less 50~130 m
LREQ5, LREQ6 Ø9.5 x 0.8 (O type) Ø22.2 x 1.0 (1/2 H type or H type)
LREQ8, LREQ10 Ø9.5 x 0.8 (O type) Ø12.7 x 0.8 (O type) Ø28.6 x 1.0 (1/2 H type or H type)
LREQ12 Ø12.7 x 0.8 (O type) Ø28.6 x 1.0 (1/2 H type or H type)
LREQ15, LREQ20 Ø12.7 x 0.8 (O type) Ø34.9 x 1.2 (1/2 H type or H type)
Piping between
branching areas (B, b,
C, c) 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 Liquid pipe size
less than 4.0 kW Ø6.4 x 0.8 (O type)
4.0 kW over and less than 14.0 kW Ø9.5 x 0.8 (O type)
14.0 kW or over Ø12.7 x 0.8 (O type)
Total capacity of indoor units after branching Gas pipe size
Medium temperature
(not less than –20°C) Low temperature
(–20°C or less)
less than 1.0 kW — Ø9.5 x 0.8 (O type)
1.0 kW over and less than 6.0 kW less than 2.3 kW Ø12.7 x 0.8 (O type)
6.0 kW over and less than 9.9 kW 2.3 kW over and less than 4.4 kW Ø15.9 x 1.0 (O type)
9.9 kW over and less than 14.5 kW 4.4 kW over and less than 6.4 kW Ø19.1 x 1.0 (O type)
14.5 kW over and less than 25.0 kW 6.4 kW over and less than 10.8 kW Ø22.2 x 1.0 (O type)
25.0 kW over and less than 31.0 kW 10.8 kW over and less than 13.4 kW Ø28.6 x 1.0 (O type)
31.0 kW or over 13.4 kW or over Ø34.9 x 1.2 (O type)
No size after branching can exceed the size of any upstream piping.
Piping between
branching areas and
each unit Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit