Operation manual
7
HXHD125A8V1B
VRV IV system indoor unit
4P404572-1 – 2015.04
Leaving water temperature control
In this mode, heating will be activated as required by the water
temperature set point. The set point can be set manually or through
the schedule timer or weather dependent (automatic).
Selecting space heating operation
1
Use the
button to switch ON/OFF space heating ( ).
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 heating: 25°C~80°C (leaving water
temperature)
In order to avoid overheating, space heating is not operable
when the outdoor ambient temperature rises above a certain
temperature (see operation range).
Refer to "Remote controller schedule timer" for setup of the schedule
timer function.
Selecting weather dependent set point operation
When weather dependent operation is active, the leaving water
temperature is determined automatically depending on the outdoor
temperature: colder outdoor temperatures will result in warmer water
and vice versa. The unit has a floating set point. Activating this
operation will result in a lower power consumption than use with a
manually fixed leaving water set point.
During weather dependent operation, the user has the possibility to
shift up or down the target water temperature by a maximum of 5°C.
This shift value is the temperature difference between the
temperature set point calculated by the controller and the real set
point. E.g. a positive shift value means that the real temperature set
point will be higher than the calculated set point.
It is advised to use the weather dependent set point because it
adjusts the water temperature to the actual needs for space heating.
It will prevent the unit from switching too much between thermo ON
operation and thermo OFF operation when using the remote
controller room thermostat or external room thermostat.
1
Press the
button 1 time to select weather dependent set
point operation (or 2 times when the remote controller room
thermostat function is used).
Icon
appears on the display as well as the shift value. The
shift value is not shown in case it is 0.
2
Use the
and
buttons to set the shift value.
Range for the shift value: –5°C to +5°C
Icon
will be displayed as long as the weather dependent set
point operation is enabled.
3
Press the
button to deactivate weather dependent set point
operation.
The
and
buttons are used to set the leaving
water temperature.
Field settings define the parameters for the weather dependent
operation of the unit. Refer to
"5.12. Field settings" on page 18
for a
detailed description how to set one or more field settings.
■
[3-00] Low ambient temperature (Lo_A): low outdoor
temperature.
■
[3-01] High ambient temperature (Hi_A): high outdoor
temperature.
■
[3-02] Set point at low ambient temperature (Lo_Ti): the target
outgoing water temperature when the outdoor temperature
equals or drops below the low ambient temperature (Lo_A).
Note that the Lo_Ti value should be higher than Hi_Ti, as for
colder outdoor temperatures (i.e. Lo_A) warmer water is required.
■
[3-03] Set point at high ambient temperature (Hi_Ti): the target
outgoing water temperature when the outdoor temperature
equals or rises above the high ambient temperature (Hi_A).
Note that the Hi_Ti value should be lower than Lo_Ti, as for
warmer outdoor temperatures (i.e. Hi_A) less warm water
suffices.
NOTICE
■
When an external room thermostat is installed, the
thermo ON/OFF is determined by the external room
thermostat. The remote controller is then operated in
the leaving control mode and is not functioning as a
room thermostat.
■
The remote controller ON/OFF status always has
priority over the external room thermostat!
INFORMATION
During this operation, instead of showing the water
temperature set point, the controller shows the shift value
which can be set by the user.
T
t
Target water temperature
T
A
Ambient (outdoor) temperature
Shift value
= Shift value
INFORMATION
If by mistake the value of [3-03] is set higher than the value
of [3-02], the value of [3-03] will always be used.
Lo_Ti
Lo_A
Hi_A
T
A
T
t
+ 05
00
– 05
Hi_Ti
Shift value
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