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Piping installation
Installer and user reference guide
65
LRYELRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant and
oil. Use K65 copper-iron alloy tube system for high-pressure applications with a
working pressure of 120 bar at the air conditioner side and 90 bar at the refrigeration
side.
NOTICE
NEVER use standard hoses and manometers. Use ONLY equipment that is designed
to use with R744.
▪
Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
16.1.2 Refrigerant piping material
▪
Piping material:
K65 copper-iron alloy (CuFe2P), maximum operating pressure =
120 bar
▪
Piping temper grade and thickness:
Piping refrigeration unit
Piping type
Outer
diameter (Ø)
Temper
grade
Thickness (t)
(a)
Liquid piping
12.7 mm
(1/2")
R420
(with heat
treatment)
≥0.85 mm
t
Ø
Gas piping
15.9 mm
(5/8")
R300
(drawn)
≥1.05 mm
(a)
Depending on the applicable legislation and the maximum working pressure of the unit
(see "PS High" on the unit name plate), larger piping thickness might be required.
Piping air conditioning unit
Piping type
Outer
diameter (Ø)
Temper
grade
Thickness (t)
(a)
Liquid piping
15.9 mm
(5/8")
R300
(drawn)
≥1.05 mm
t
Ø
Gas piping
19.1 mm
(3/4")
R300
(drawn)
≥1.30 mm
(a)
Depending on the applicable legislation and the maximum working pressure of the unit
(see "PS High" on the unit name plate), larger piping thickness might be required.
16.1.3 Refrigerant piping length and height difference
Requirements and limits
The piping lengths and height differences must comply with the following
requirements. For an example, see
