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Configuration
Installer reference guide
138
EPRA08~W1 + ET9W
Daikin Altherma 3 H MT F
4P634887-1 – 2021.03
Antifrost
[1.4]
Antifrost
prevents the room from getting too cold. This setting is
applicable when [2.9]
Control
=
Room thermostat
, but also offers functionality
for leaving water temperature control and external room thermostat control. In
case of the latter two,
Antifrost
can be activated by setting field setting
[2-06]=1.
Room frost protection, when enabled, is not guaranteed when there is no room
thermostat that can activate the heat pump. This is the case when:
▪
[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 6°C.
Main zone unit control method [2.9]
Description
Leaving water temperature control
([C
‑
07]=0)
Room frost protection is NOT guaranteed.
External room thermostat control
([C
‑
07]=1)
Allow for the external room thermostat to
take care of room frost protection:
▪
Set
[C.2]
Space
heating/
cooling
=
On
.
Room thermostat control
([C
‑
07]=2)
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
.
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 heating/cooling
), room frost protection operation –if
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:
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