5 Preparation
Installer and user reference guide
12
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1 – 2018.09
If the outdoor unit is exposed to direct sea winds, install a
windbreaker.
▪ Height of windbreaker≥1.5×height of outdoor unit
▪ Mind the service space requirements when installing the
windbreaker.
a
b
c
d
c
d
a
Sea wind
b
Building
c
Outdoor unit
d
Windbreaker
▪ All piping lengths and distances have been taken into
"5.3.4 About the piping length" on page 15
5.2.2
Additional installation site requirements
of the outdoor unit in cold climates
NOTICE
When operating the unit in a low outdoor ambient
temperature, be sure to follow the instructions described
below.
▪ To prevent exposure to wind and snow, install a baffle plate on the
air side of the outdoor unit:
In heavy snowfall areas it is very important to select an installation
site where the snow will NOT affect the unit. If lateral snowfall is
possible, make sure that the heat exchanger coil is NOT affected by
the snow. If necessary, install a snow cover or shed and a pedestal.
INFORMATION
For instructions on how to install the snow cover, contact
your dealer.
NOTICE
When installing the snow cover, do NOT obstruct the air
flow of the unit.
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:
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 has to operate for 5 days in this area with
high humidity (>90%), Daikin recommends to install the
optional heater tape kit (EKBPH012TA or EKBPH020TA)
to keep the drain holes free.
5.2.3
Securing safety against refrigerant leaks
About safety against refrigerant leaks
The installer and system specialist shall secure safety against
leakage according to local regulations or standards. The following
standards may be applicable if local regulations are not available.
This system uses R410A as refrigerant. R410A itself is an entirely
safe non-toxic, non-combustible refrigerant. Nevertheless care must
be taken to ensure that the system is installed in a room which is
sufficiently large. This assures that the maximum concentration level
of refrigerant gas is not exceeded, in the unlikely event of major leak
in the system and this in accordance to the local applicable
regulations and standards.
About the maximum concentration level
The maximum charge of refrigerant and the calculation of the
maximum concentration of refrigerant is directly related to the
humanly occupied space in to which it could leak.
The unit of measurement of the concentration is kg/m
3
(the weight in
kg of the refrigerant gas in 1 m
3
volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
According to the appropriate European Standard, the maximum
allowed concentration level of refrigerant to a humanly space for
R410A is limited to 0.44 kg/m
3
.
