125A8V1BF
VRV IV System indoor unit
4P405267-1C – 2021.04
Installation and operation manual
29
28
TIME ADJUST BUTTONS
and
These multi-purpose buttons are used to adjust the clock, to
toggle between temperatures (water inlet/outlet temperature of
the unit, outdoor ambient temperature, actual room temperature)
and in schedule timer programming mode.
29
LEAVING WATER TEMPERATURE ADJUST BUTTONS
and
These buttons are used to adjust the leaving water temperature
set point in normal operation mode or in schedule timer
programming mode.
If the controller is set to permission level 3 (refer to "Field
settings" in the installation manual), the leaving water
temperature adjust button will not be operable.
In case the weather dependent set point operation is selected,
the unit has a floating set point. In this case, the icon as well
as the shift value (in case not zero) will display.
30
ROOM TEMPERATURE ADJUST BUTTONS
and
These multi-purpose buttons are used to adjust the current room
temperature set point in normal operation mode or in schedule
timer programming mode.
When changing the room temperature set point, the set point
value on the display will be flashing. After 5 seconds the display
will show to the actual room temperature.
31
BUTTON
This button has no function.
11.3.3. Setting up the controller
After initial installation, the user can set the clock and day of the
week.
The controller is equipped with a schedule timer that enables the user
to schedule operations. Setting the clock and day of the week is
required to be able to use the schedule timer.
Setting the clock
1
Hold down the
button for 5 seconds.
The clock read-out and the day of week indicator start flashing.
2
Use the
and
buttons to adjust the clock.
Each time the
or
button is pressed, the time will
increase/decrease by 1 minute. Keeping the
or
button pressed will increase/decrease the time by 10 minutes.
3
Use the
or
button to adjust the day of the week.
Each time the
or
button is pressed the next or
previous day is displayed.
4
Press the button to confirm the current set time and day of the
week.
To leave this procedure without saving, press the
button.
If no button is pressed for 5 minutes the clock and day of the
week will return to their previous setting.
Setting the schedule timer
To set the schedule timer, refer to chapter
and consulting the schedule timer" on page 33
11.3.4. Space cooling operation ( )
Space cooling operation can be controlled in two different ways:
based on room temperature,
based on leaving water temperature (default).
The purpose of each operation and how the configuration is done, is
explained below.
Room temperature control
In this mode, cooling will be activated as required by the room
temperature set point. The set point can be set manually or through
the schedule timer.
Selecting space cooling operation
1
Use the
button to switch ON/OFF space cooling ( ).
Icon appears on the display as well as the corresponding
actual room temperature.
The operation LED lights up.
2
Use the
and
buttons to set the desired room
temperature.
Temperature range for cooling: 16°C~32°C (room temperature)
Refer to
"11.3.10. Programming and consulting the schedule
for setup of the schedule timer function.
3
Use the
and
buttons to select the leaving
water temperature which you want to be used to cool down your
system.
Leaving water temperature control (default)
In this mode, cooling will be activated as required by the water
temperature set point. The set point can be set manually or through
the schedule timer.
Selecting space cooling operation
1
Use the
button to switch ON/OFF space cooling ( ).
Icon appears on the display as well as the corresponding
water temperature set point.
The operation LED lights up.
2
Use the
and
buttons to set the desired leaving
water temperature.
Temperature range for cooling: 5°C~20°C (leaving water
temperature).
Refer to
"Programming space cooling" on page 34
for setup of the schedule timer function.
11.3.5. Space heating operation ( )
Space heating operation can be controlled in two different ways:
based on room temperature,
based on leaving water temperature (default).
The purpose of each operation and how the configuration is done, is
explained below.
Room temperature control
In this mode, heating will be activated as required by the room
temperature set point. The set point can be set manually or through
the schedule timer.
INFORMATION
The clock needs to be set manually. Adjust the setting
when switching from summertime to wintertime and
vice versa.
If the controller is set to permission level 2 or 3 (refer
to "Field settings" in the installation manual), setting
the clock will not be possible.
A power failure exceeding 2 hours will reset the clock
and the day of the week. The schedule timer will
continue operation, but with a disordered clock.
Therefor it will be needed to correct the clock and the
day of the week.
INFORMATION
When using room temperature control, space cooling
operation based on room temperature will have priority
over leaving water control.
Note that it is possible that the leaving water temperature
becomes lower than the set point if the unit is controlled by
room temperature.
INFORMATION
When an external room thermostat is installed, the
thermo ON/OFF is determined by the external room
thermostat. The user interface is then operated in the
leaving control mode and is not functioning as a room
thermostat.
The user interface ON/OFF status always has priority
over the external room thermostat!
Setback operation and weather dependent set point
are not available in cooling operation.
Summary of Contents for HXY080A8V1BF
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