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Operation
Installer and user reference guide
29
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
Cooling
Heating
Outdoor temperature
–5~46°C DB
–20~20°C DB
–20~15.5°C WB
Indoor temperature
21~32°C DB
14~25°C WB
15~27°C DB
Indoor humidity
≤80%
(a)
(a)
To avoid condensation and water dripping out of the unit. If the temperature or the
humidity is beyond these conditions, safety devices may be put in action and the air
conditioner may not operate.
Above operation range is only valid in case direct expansion indoor units are
connected to the VRV 5 system.
7.3 Operating the system
7.3.1 About operating the system
▪
Operation procedure varies according to the combination of outdoor unit and
user interface.
▪
To protect the unit, turn on the main power switch 6 hours before operation.
▪
If the main power supply is turned off during operation, operation will restart
automatically after the power turns back on again.
7.3.2 About cooling, heating, fan only, and automatic operation
▪
Changeover cannot be made with a user interface whose display shows
"change-over under centralised control" (refer to installation and operation
manual of the user interface).
▪
When the display
"change-over under centralised control" flashes, refer to
"7.6.1 About setting the master user interface"
▪
The fan may keep on running for about 1 minute after the heating operation
stops.
▪
The air flow rate may adjust itself depending on the room temperature or the fan
may stop immediately. This is not a malfunction.
7.3.3 About the heating operation
It may take longer to reach the set temperature for general heating operation than
for cooling operation.
The following operation is performed in order to prevent the heating capacity from
dropping or cold air from blowing.
Defrost operation
In heating operation, freezing of the outdoor unit's air cooled coil increases over
time, restricting the energy transfer to the outdoor unit's coil. Heating capability
decreases and the system needs to go into defrost operation to be able to remove
frost from the outdoor unit’s coil. During defrost operation the heating capacity on
the indoor unit side will temporarily drop until defrosting is completed. After
defrosting, the unit will regain its full heating capacity.
