Daikin Altherma 3 R F Installer's Reference Manual page 150

10 | Configuration
Installer reference guide
150
▪ [2.9] Control=External room thermostat and [C.2] Space heating/
cooling=Off, or if
▪ [2.9] Control=Leaving water.
In the above cases, Antifrost will heat the space heating water to a reduced
setpoint when the outdoor temperature is lower than 4°C.
Main zone unit control method [2.9]
Leaving water temperature control
([C‑07]=0)
External room thermostat control
([C‑07]=1)
Room thermostat control
([C‑07]=2)
INFORMATION
If a U4 error occurs, room frost protection is NOT guaranteed.
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 [1.4] is activated, limited frost protection
by the unit is possible:
If...
Space heating/cooling is OFF and
the outdoor ambient temperature
drops below 4°C
Space heating/cooling is ON and
the operation mode is "heating"
Room frost protection is NOT guaranteed.
Allow for the external room thermostat to
take care of room frost protection:
▪ Set [C.2]
cooling=On.
Allow for the user interface used as room
thermostat to take care of room frost
protection:
▪ Set antifrost [1.4.1] Activation=Yes.
▪ Set the temperature of the antifrost
function in [1.4.2] Room setpoint.
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 leaving water
temperature setpoint will be lowered.
The unit will supply leaving water to the
heat emitters to heat up the room
according to normal logic.
Description
Space heating/
Then...
ERGA04~08E + EHVZ04+08S18+23E
Daikin Altherma 3 R F
4P629093-1B – 2022.05