Daikin EWAQ004BAVP Installer's Reference Manual page 57

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:
▪ 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.
[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 9°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
operation mode is "heating", then the unit will supply leaving water
to the heat emitters to heat up the room according to normal logic.
▪ When the leaving water temperature home page is ON and the
operation mode is "cooling", then there is no protection.
Water pipe freeze prevention
Water pipe freeze prevention is a protective function that tries to
keep the water temperature of the system within the operation range
of the heat pump.
# Code
N/A [4-04] ▪ 0
Protection enabled.
▪ 1
Protection enabled.
▪ 2 (No protection): Protection disabled.
NOTICE
If negative ambient temperatures are expected, do NOT
disable this function.
Shut-off valve
The shut-off valve is in the main leaving water temperature zone,
and is connected to the heating/cooling output.
NOTICE
The output of the shut‑off valve is NOT configurable. Do
NOT change the value of setting [F‑0B]. Only connect NO
(normal open) shut‑off valves.
EWAQ+EWYQ004+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
Description
(Intermittent pump operation):
(Continuous pump operation):
Operation range
Depending on the average outdoor temperature, the operation of the
unit in space heating or space cooling is prohibited.
Space heating OFF temp: When the averaged outdoor temperature
rises above this value, space heating is turned OFF to avoid
overheating.
# Code
[A.3.3.1] [4-02] 14°C~35°C (default: 25°C)
The same setting is also used in
automatic heating/cooling changeover.
Space cooling On temp: ONLY applicable for EWYQ004+005BAVP.
When the averaged outdoor temperature drops below this value,
space cooling is turned OFF.
# Code
[A.3.3.2] [F-01] 10°C~35°C (default: 20°C)
The same setting is also used in
automatic heating/cooling changeover.
Automatic heating/cooling changeover
ONLY applicable for EWYQ004+005BAVP.The end-user sets the
desired operation mode on the user interface: Heating, Cooling or
Automatic (see also operation manual/user reference guide). When
Automatic is selected, the changing of the operation mode is based
on:
▪ Monthly allowance for heating and/or cooling: the end-user
indicates on a monthly base which operation is allowed ([7.5]: both
heating/cooling or heating ONLY or cooling ONLY). If the allowed
operation mode changes to cooling ONLY, the operation mode
changes to cooling. If the allowed operation mode changes to
heating ONLY, the operation mode changes to heating.
▪ Averaged outdoor temperature: the operation mode will be
changed in order to ALWAYS be within range determined by the
space heating OFF temperature for heating and the space cooling
On temperature for cooling. If the outdoor temperature drops, the
operation mode switches to heating and vice versa. Note that the
outdoor temperature will
"8 Configuration" on page 46).
When the outdoor temperature is between the space cooling On and
the space heating OFF temperature, the operation mode remains
unchanged unless the system is configured in room thermostat
control with one leaving water temperature zone and quick heat
emitters. In that case, the operation mode will change based on:
▪ Measured indoor temperature: besides the heating and the
cooling desired room temperature, the installer sets a hysteresis
value (e.g. when in heating, this value is related to the desired
cooling temperature) and an offset value (e.g. when in heating,
this value is related to the desired heating temperature). Example:
the desired room temperature in heating is 22°C and in cooling
24°C, with a hysteresis value of 1°C and an offset of 4°C.
Changeover from heating to cooling will occur when the room
temperature rises above the maximum of the desired cooling
temperature added by the hysteresis value (thus 25°C) and the
desired heating temperature added by the offset value (thus
26°C). Oppositely, changeover from cooling to heating will occur
when the room temperature drops below the minimum of the
desired heating temperature subtracted by the hysteresis value
(thus 21°C) and the desired cooling temperature subtracted by the
offset value (thus 20°C).
▪ Guard timer to prevent too frequent changing from heating to
cooling and vice versa.
Changeover settings related to the outdoor temperature (ONLY
when automatic is selected):
8 Configuration
Description
Description
be time-averaged (see
Installer reference guide
57