Preparation; Preparing The Installation Site; Installation Site Requirements Of The Outdoor Unit; Additional Installation Site Requirements Of The Outdoor Unit In Cold Climates - Daikin RXYSCQ5TMV1B Installation And Operation Manual

4 Preparation

a VRV IV-S Heat pump outdoor unit
b Refrigerant piping
c VRV direct expansion (DX) indoor unit
d User interface (dedicated depending on indoor unit type)
e BP box (required to connect Residential Air (RA) or Sky Air
(SA) direct expansion (DX) indoor units)
f Residential Air (RA) direct expansion (DX) indoor units
g User interface (wireless, dedicated depending on indoor
unit type)
4 Preparation
4.1

Preparing the installation site

4.1.1 Installation site requirements of the
outdoor unit
Mind the spacing guidelines. See the "Technical data" chapter, and
the figures on the inside of the front cover.
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.
4.1.2 Additional installation site requirements
of the outdoor unit in cold climates
NOTICE
When operating the unit in heating 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 is selected to operate at ambient temperatures
lower than –5°C for 5 days or longer, with relative humidity
levels exceeding 95%, we recommend to apply a Daikin
range specifically designed for such application and/or to
contact your dealer for further advice.
Installation and operation manual
6
and light industrial
25 27 30
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.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
4.2.2

Refrigerant piping material

▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter Temper grade
(Ø)
6.4 mm (1/4") Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8") Annealed (O)
19.1 mm (3/4") Half hard (1/2H)
(a) Depending on the applicable legislation and the unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.
4.2.3

To select the piping size

Determine the proper size using the following tables and reference
figure (only for indication).
INFORMATION
▪ Combination of VRV DX and RA DX indoor units is not
allowed.
▪ Combination of RA DX and AHU indoor units is not
allowed.
▪ Combination of RA DX and aircurtain indoor units is not
allowed.
INFORMATION
If you install RA DX indoor units, you have to configure
field setting [2‑38] (= type of installed indoor units). See
"6.1.8 Mode 2: Field settings" on
VRV DX
1
A
2
B-1 B-2
2 2
C-1 C-2 C-3 C-4
3-1 3-2 3-3 3-4
1 Outdoor unit
(a)
Thickness (t)
Ø
≥0.80 mm
t
≥0.99 mm
≥0.80 mm
page 17.
RA DX
1
A
2
D D
4 4
E E E E
5 5 5 5
RXYSCQ4~6TMV1B
VRV IV-S system air conditioner
4P555881-1 – 2019.07