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8 Configuration
NOTICE
If the system does NOT contain a backup heater, do NOT
change the default room antifrost temperature.
INFORMATION
If a U4 error occurs, room frost protection is NOT
guaranteed.
Refer to the sections below for detailed information on room frost
protection in relation to the applicable unit control method.
[C‑07]=2: room thermostat control
Under room thermostat control, room frost protection is guaranteed,
even if the room temperature home page is OFF on the user
interface. When room frost protection ([2‑06]) is enabled and the
room temperature drops below the room antifrost temperature
([2‑05]), the unit will supply leaving water to the heat emitters to heat
up the room again.
#
Code
N/A
[2-06]
Room frost protection
▪ 0: disabled
▪ 1: enabled (default)
N/A
[2-05]
Room antifrost temperature
4°C~16°C (default: 12°C)
INFORMATION
If a U5 error occurs:
▪ when 1 user interface is connected, room frost
protection is NOT guaranteed,
▪ when 2 user interfaces are connected and the second
user interface used for room temperature control is
disconnected (due to miswiring, damage of the cable),
then room frost protection is NOT guaranteed.
NOTICE
If Emergency is set to Manual ([A.6.C]=0), and the unit is
triggered to start emergency operation, the user interface
will ask confirmation before starting. Room frost protection
is active even if the user does NOT confirm emergency
operation.
[C‑07]=1: external room thermostat control
Under external room thermostat control, room frost protection is
guaranteed by the external room thermostat, provided that the
leaving water temperature home page is ON on the user interface,
and the auto emergency setting ([A.6.C]) is set to "1".
Additionally, limited frost protection by the unit is possible:
Installer reference guide
60
Description
In case of...
One leaving water temperature
zone
Two leaving water temperature
zones
[C‑07]=0: leaving water temperature control
Under leaving water temperature control, room frost protection is
NOT guaranteed. However, if [2‑06] is set to "1", limited frost
protection by the unit is possible:
▪ When the leaving water temperature home page is OFF and the
outdoor ambient temperature drops below 4°C, then 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.
ERLQ004~008CA + EHVH/X04+08S18+26CB
...then the following applies:
▪ When
the
leaving
water
temperature home page is
OFF and the outdoor ambient
temperature drops below 4°C,
then
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.
▪ When
the
leaving
water
temperature home page is ON,
the external room thermostat
is "Thermo OFF" and the
outdoor ambient temperature
drops below 4°C, then 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.
▪ When
the
leaving
water
temperature home page is ON
and
the
external
room
thermostat is "Thermo ON",
then room frost protection is
guaranteed
by
the
normal
logic.
▪ When
the
leaving
water
temperature home page is
OFF, and the outdoor ambient
temperature drops below 4°C,
then
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.
▪ When
the
leaving
water
temperature home page is ON,
the
operation
mode
"heating", and the outdoor
ambient
temperature
drops
below 4°C, then 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 selection of "cooling" or
"heating" is done via the user
interface. When the leaving
water temperature home page
is ON and the operation mode
is "cooling", then there is no
protection.
Daikin Altherma – Low temperature split
4P384973-1D – 2018.07
is
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