3 About the units and options
Installation and operation manual
6
RXYSQ6T8Y1B9
VRV IV-S system air conditioner
4P482276-1 – 2017.04
3
About the units and options
3.1
About the outdoor unit
This installation manual concerns the VRV IV-S, full inverter driven,
heat pump system.
These units are intended for outdoor installation and aimed for air to
air heat pump applications.
Specification
RXYSQ6
Capacity
Heating
18.1 kW
Cooling
18.1 kW
Ambient design
temperature
Heating
–20~15.5°C WB
Cooling
–5~46°C DB
3.2
System layout
NOTICE
Design of the system must not be done at temperatures
below –15°C.
d
d
c
c
b
a
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)
4
Preparation
4.1
Preparing 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
and
light
industrial
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:
T
AO
(°C WB)
a
b
20
15.5
15
10
5
0
–5
–10
–15
–20
10
15
20
25 27 30
T
AI
(°C DB)
a
Warming up operation range
b
Operation range
T
AI
Ambient indoor temperature
T
AO
Ambient outdoor temperature
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.
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.
▪
Piping temper grade and thickness:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
Annealed (O)
≥0.80 mm
t
Ø
15.9 mm (5/8")
Annealed (O)
≥0.99 mm
19.1 mm (3/4")
Half hard (1/2H) ≥0.80 mm
(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.
▪
Flare connections:
Only use annealed material.
