17 | Unit installation
Installer and user reference guide
64
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
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.
17.1.3 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/m³ (the weight in kg of the
refrigerant gas in 1m³ volume of the occupied space).
Compliance to the local applicable regulations and standards for the maximum
allowable concentration level is required.
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