Daikin EPRA18DAW1 Installer's Reference Manual page 128

9 | Configuration
Installer reference guide
128
▪ [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 6°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, the room Antifrost setting MUST be disabled.
NOTICE
Room frost protection. Even if you turn OFF space heating/cooling operation ([C.2]:
Operation > Space heating/cooling), room frost protection –if enabled– will
remain active.
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
Description
Room frost protection is NOT guaranteed.
Allow for the external room thermostat to
take care of room frost protection:
▪ Set [C.2] Space
cooling=On.
Allow for the dedicated Human Comfort
Interface (BRC1HHDA 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.
Then...
▪ 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.
EPRA14~18DAV3+W1 + ETVZ16S18+23DA6V+9W
heating/
Daikin Altherma 3 H HT F
4P587503-1A – 2020.01