Daikin EWYA004D2V3P Installer's Reference Manual page 130

11 | Configuration
Installer reference guide
130
NOTICE
If the room Antifrost setting is active and a U4 error occurs, the unit will
automatically start the Antifrost function via the backup heater. If the backup
heater is not allowed for room frost protection during a U4 error, the room
Antifrost setting MUST be disabled.
NOTICE
Room frost protection. Even if you turn OFF space heating/cooling operation ([C.2]:
Operation > Space
enabled– can still activate. However, for leaving water temperature control and
external room thermostat control, the protection is NOT guaranteed.
For more detailed information about room frost protection in relation to the
applicable unit control method, see the sections below.
Leaving water temperature control ([C‑07]=0)
Under leaving water temperature control, room frost protection is NOT
guaranteed. However, if room antifrost [2‑06] is activated, limited frost protection
by the unit is possible:
If...
▪ Space heating/cooling=Off,
and
▪ Outdoor ambient temperature drops
below 6°C
▪ Space heating/cooling=On, and
▪
Operation mode=Heating
▪ Space heating/cooling=On, and
▪ Operation mode=Cooling
External room thermostat control ([C‑07]=1)
Under external room thermostat control, room frost protection is guaranteed by
the external room thermostat, provided that:
▪ [C.2] Space heating/cooling=On, and
▪ [9.5.1] Emergency=Automatic or auto SH normal/DHW off.
However, if [1.4.1] Antifrost is activated, limited frost protection by the unit is
possible.
In case of 1 leaving water temperature zone:
If...
▪ Space heating/cooling=Off,
and
▪ Outdoor ambient temperature drops
below 6°C
heating/cooling), room frost protection operation –if
▪ The unit will supply leaving water to
the heat emitters to heat up the room
again, and
▪ the temperature setpoint of the
leaving water will be lowered.
The unit will supply leaving water to the
heat emitters to heat up the room
according to normal logic.
There is no room frost protection.
▪ The unit will supply leaving water to
the heat emitters to heat up the room
again, and
▪ the temperature setpoint of the
leaving water will be lowered.
Then...
Then...
EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09