Daikin VRV IV+ User Manual

18 | Piping installation
Installer and user reference guide
71
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 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 Temper grade of piping material
≤15.9mm O (annealed)
≥19.1mm 1/2H (half hard)
▪ All piping lengths and distances have been taken into consideration (see "About
the piping length"[475]).
18.1.2 Refrigerant piping insulation
▪ 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 Humidity Minimum thickness
≤30°C 75% to 80% RH 15mm
>30°C ≥80% RH 20mm
18.1.3 To select the piping size
Determine the proper size using the following tables and reference figure (only for
indication).
C
A
B
D E
C C
E
a
b
x
y
43
1 2
1,2 VRVDX indoor unit
3 Branch selector unit (BS*)
4 Cooling-only VRV indoor unit
A~E Piping
a,b Indoor branch kit
x,y Outdoor multi connection kit

Daikin VRV IV+ Specifications

General

Brand	Daikin
Model	VRV IV+
Category	Heat Pump
Language	English