Daikin HXY080A7V1B Installation And Operation Manual page 23

[8-02] Emergency operation.

In case of emergency, heating can be provided by the heater kit,
not by hydrobox. Emergency mode can be activated by setting
[8-02]=1 (default value is "0").
Activating the emergency mode will stop the heat pump
operation of the hydrobox. The pump of the indoor unit will be
started, but heating itself is done by the heater kit. If there are no
malfunction conditions in leaving or return water thermistors of
the hydrobox, the heater kit can start to follow emergency
operation.
[8-03] Setting is not applicable.

[8-04] Freeze-up prevention.

The unit has a freeze-up prevention functionality for which
3 levels can be selected:
 [8-04]=0 prevention level 0 (default: no prevention).
 [8-04]=1 prevention level 1.
 [8-04]=2 prevention level 2.
The freeze-up prevention is only active when the unit is in
thermo OFF condition. If prevention level 1 is enabled, the
freeze-up prevention
temperature <4°C and if leaving or return water temperature
<7°C. For prevention level 2, the freeze-up prevention will start
as soon as the ambient temperature <4°C.
For both cases the pump will operate and if leaving or return
water <5°C for 5 minutes the unit will start up to prevent too low
temperatures.
[9] Automatic temperature compensation
If needed, it is possible to adjust some thermistor value of the unit by
a correction value. This can be used as countermeasure for
thermistor tolerances or capacity shortage.
The compensated temperature (= measured temperature plus
compensation value) is then used for controlling the system and will
be displayed in the temperature read-out mode.
[9-00] Leaving water temperature compensation value for

heating operation.
[9-01] Leaving water thermistor auto corrective function.

When enabled, this function will take into account the outdoor
ambient conditions and correct the measured value which will be
used for the logic.
Eg. when the ambient temperature is high during cooling mode,
the logic will correct the measured value of the leaving water
thermistor to a lower value to take into account influence of high
ambient temperatures in the measurement.
[9-02] Setting is not applicable.

[9-03] Leaving water temperature compensation value for

cooling operation.
[9-04] Setting not applicable.

[A] Option setup
[A-00] Setting is not applicable.

[A-01] Setting is not applicable.

[A-02] Pump target ∆T setting (heating).

Depending on the systems emitter type, the ∆T over the emitter
can be modified within the range 3~8°C. Default value is 5°C for
fancoil units or floor heating loops.
[A-03] Leaving water temperature overshoot/undershoot value

This setting makes it possible to set the allowable overshoot
(heating)/undershoot (cooling) when operating the unit during
leaving water control.
[A-04] Setting is not applicable.

[b] Settings are not applicable
HXY080+125A7V1B
VRV IV System indoor unit
4P325971-1B – 2012.07
will start if the outdoor
[C] Leaving water temperature limits
[C-00] Maximum leaving water set point in heating operation.

[C-01] Minimum leaving water set point in heating operation.

[C-02] Maximum leaving water set point in cooling operation.

[C-03] Minimum leaving water set point in cooling operation.

If a leaving water temperature of 5°C is wanted, this limit needs
to be adjusted. Be aware this can have an impact towards the
efficiency of your system.
[C-04] Setting is not applicable.

[d] Settings are not applicable
[E] Service mode
[E-00] Setting is not applicable.

 [E-01] Setting is not applicable.
[E-02] Setting is not applicable.

[E-03] Setting is not applicable.

[E-04] Pump only operation (air purge function)

When installing and commisioning the unit it is very important to
ambient
get all air out of the water circuit.
Through this field setting the pump can be operated without
actual operation of the unit. By doing so this will enhance the air
removal from the unit.
 [E-04]=0 normal operation of the unit (default)
 [E-04]=1 low pump speed operation
 [E-04]=2 high pump speed operation
If you select [E-04]=1 or 2, the unit will activate the air
purging function. This function is a helpful feature to get all air
removed out of the system (as well in space heating as
space cooling).
[F] Option setup
[F-00] Pump target ∆T setting (cooling).

Depending on the systems emitter type, the ∆T over the emitter
can be modified within the range 3~8°C. Default value is 5°C for
fancoil units or floor heating loops.
 [F-01] Setting is not applicable.
[F-02] Setting is not applicable.

[F-03] Setting is not applicable.

[F-04] Setting is not applicable.

[E-04]=1 or 2

Pump operation for 40 minutes
Installation and operation manual
21