Refrigerant Piping Insulation - Daikin VRV IV Q+ Series Installer And User Reference Manual

18.1.2 Refrigerant piping insulation

RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546229-1A – 2020.10
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.
▪ Only use phosphoric acid deoxidised seamless copper.
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
▪ Temper grade: use piping with temper grade in function of the pipe diameter as
listed in table below.
Pipe Ø
≤15.9 mm
≥19.1 mm
▪ All piping lengths and distances have been taken into consideration (see
4
the piping length" [ 75]).
NOTICE
When existing field piping is re-used, the design pressure of the piping has to be
33 bar (3.3 MPa) or higher.
NOTICE
Check also if the existing field piping (including branch piping) is compatible with the
unit in terms of materials and thickness, and if the pipes and branch piping are not
corroded. If the existing field piping does not comply with the above conditions,
replace the existing field piping with field piping that meets the specific conditions.
NOTICE
Check if there was no compressor malfunction or similar issues that could contribute
to piping problems in the past. If there were such problems, check that the
appropriate repairs were made, and if not, perform such repairs.
INFORMATION
The RXYQQ unit will limit the pressure on the field piping to 33 bar. Inside the
outdoor unit, the design pressure is 40 bar.
▪ Use polyethylene foam as insulation material:
- with a heat transfer rate between 0.041 and 0.052 W/mK (0.035 and
0.045 kcal/mh°C)
- with a heat resistance of at least 120°C
▪ Insulation thickness
Ambient temperature
≤30°C
>30°C
18
Temper grade of piping material
O (annealed)
1/2H (half hard)
Humidity
75% to 80% RH
≥80% RH
Piping installation
|
"About
Minimum thickness
15 mm
20 mm
Installer and user reference guide
71