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10.3.4. Space cooling operation (c)
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.
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.
Selecting space cooling operation
Use the y button to switch ON/OFF space cooling (c).
1
Icon c appears on the display as well as the corresponding
actual room temperature.
The operation LED 0 lights up.
Use the bi and bj buttons to set the desired room
2
temperature.
Temperature range for cooling: 61~90°F (16~32°C) (room
temperature)
Refer to "10.3.10. Programming and consulting the schedule
timer" on page 33 for setup of the schedule timer function.
Use the ébi and ébj buttons to select the leaving
3
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
Use the y button to switch ON/OFF space cooling (c).
1
Icon c appears on the display as well as the corresponding
water temperature set point.
The operation LED 0 lights up.
Use the ébi and ébj buttons to set the desired leaving
2
water temperature.
Temperature range for cooling: 50~68°F (10~20°C) (leaving
water temperature).
Refer to "Programming space cooling" on page 33, "Programming
space heating" on page 34 for setup of the schedule timer function.
INFORMATION
When an optional demand PCB is installed, the
thermo ON/OFF is determined by the optional
demand PCB. 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 optional demand PCB!
Setback operation and weather dependent set point
are not available in cooling operation.
10.3.5. Space heating operation (h)
Space heating operation can be controlled in two different ways:
based on room temperature,
based on leaving water temperature (default).
HXY48TAVJU
VRV System indoor unit
3P616151-1A – 2021.12
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
When using room temperature control, space heating
operation based on room temperature will have priority
over leaving water control.
Note that it is possible that the leaving water temperature
becomes higher than the set point if the unit is controlled
by room temperature.
Selecting space heating operation
Use the y button to switch ON/OFF space heating (h).
1
Icon h appears on the display as well as the corresponding
actual room temperature set point.
The operation LED 0 lights up.
Use the bi and bj buttons to set the desired room
2
temperature.
Temperature range for heating: 61~90°F (16~32°C) (room
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 "10.3.10. Programming and consulting the schedule
timer" on page 33 for setup of the schedule timer function.
Use the ébi and ébj buttons to select the leaving
3
water temperature which you want to be used to heat up your
system.
Automatic setback function
Setback function provides the possibility to lower the room
temperature. The setback function can for instance be activated
during the night because the temperature demands during night and
day are not the same.
INFORMATION
Remark that the b icon will be flashing during setback
operation.
By default the setback function is enabled.
The setback function can be combined with the
automatic weather dependent set point operation.
Setback function is an automatic daily scheduled
function.
The setback function is configured through field settings. Refer to the
chapter "8.3. Field settings" on page 18 for a detailed description how
to set one or more field settings.
[2-00] Status: defines whether the setback function is turned ON
(1) or OFF (0)
[2-01] Start time: time at which setback is started
[2-02] Stop time: time at which setback is stopped
[5-03] Room setback temperature
T
70°F
A
(21°C)
64°F
B
(18°C)
[2-01]
A Normal room temperature set point
B Room setback temperature [5-03]
t Time
T Temperature
t
[2-02]
Installation and operation manual
29
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