Additional Installation Site Requirements Of The Outdoor Unit In Cold Climates; Preparing Refrigerant Piping; Refrigerant Piping Requirements; To Select The Piping Size - Daikin VRV IV RYYQ10T7Y1B Series Installation And Operation Manual

CAUTION
Appliance not accessible to the general public, install it in a
secured area, protected from easy access.
This unit, both indoor and outdoor, is suitable for
installation in a commercial
environment.
NOTICE
This is a class A product. In a domestic environment this
product may cause radio interference in which case the
user may be required to take adequate measures.
4.1.2 Additional installation site requirements
of the outdoor unit in cold climates
NOTICE
When operating the unit in a low outdoor ambient
temperature with high humidity conditions, make sure to
take precautions to keep the drain holes of the unit free by
using proper equipment.
In heating:
20
15.5
15
10
5
a b
0
–5
–10
–15
–20
10 15 20
T (°C DB)
AI
a Warming up operation range
b Operation range
T Ambient indoor temperature
AI
T Ambient outdoor temperature
AO
If the unit has to operate for 5 days in this area with
high humidity (>90%), Daikin recommends to install the
optional heater tape kit (EKBPH012T or EKBPH020T) to
keep the drain holes free. If you do so, you also have to
install the heater tape PCB kit (EKBPHPCBT).
4.2

Preparing refrigerant piping

4.2.1

Refrigerant piping requirements

NOTICE
Refrigerant R410A requires strict cautions for keeping the
system clean and dry. Foreign materials (including mineral
oils or moisture) should be prevented from getting mixed
into the system.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1C – 2016.07
and light industrial
25 27 30
▪ 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 (mm) Temper grade of piping material
≤15.9
≥19.1
▪ All piping lengths and distances have been taken into
consideration (see About the piping length in the installer
reference guide).
4.2.2

To select the piping size

INFORMATION
When using FXTQ indoor units, different requirements
apply. See "4.2.4 Requirements in case of FXTQ indoor
units" on page 9.
Determine the proper size referring to following tables and reference
figure (only for indication).
A
a x
D F
b 3
G
E
1 2 4 5
1,2 VRV DX indoor unit
3 BP box
4,5 RA DX indoor unit
a,b Indoor branch kit
x,y Outdoor multi connection kit
A, B, C: Piping between outdoor unit and (first)
refrigerant branch kit
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
Outdoor unit Piping outer diameter size (mm)
capacity type (HP)
Gas pipe
8
10
12~16
18~22
24
26~34
36~54
D: Piping between refrigerant branch kits
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the
connection piping exceed the refrigerant piping size chosen by the
general system model name.
4 Preparation
O (annealed)
1/2H (half hard)
B B B
C
y
Liquid pipe
19.1 9.5
22.2 9.5
28.6 12.7
28.6 15.9
34.9 15.9
34.9 19.1
41.3 19.1
Installation and operation manual
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