Daikin SEHVX20BAW - About Operating the System; Space Cooling Operation; Space Heating Operation

16 Operation
Installer and user reference guide
64
SERHQ020~032BAW1 + SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1A – 2018.01
16.3.2 About operating the system
If the main power supply is turned off during operation, operation will
restart automatically after the power turns back on again.
16.3.3 Space cooling operation
Space cooling can be controlled in 2 different ways:
▪ based on room temperature
▪ based on leaving water temperature (default)
To switch space cooling on/off using room
temperature control
In this mode, cooling will be activated as required by the room
temperature setpoint. The setpoint 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.
▪ It is possible that the leaving water temperature
becomes higher than the setpoint if the unit is
controlled by room temperature.
1 Press to switch space cooling ( ) on/off.
Result: and the corresponding actual room temperature
setpoint appear on the display. The operation LED lights up.
2 Set the desired room temperature using and . For
setup of the schedule timer function, see "16.3.6 Schedule
timer"on page65.
INFORMATION
Temperature range for cooling: 16°C~32°C (room
temperature)
3 Select the leaving water temperature which you want to be
used to cool down your system using and . For
detailed information, see "To switch space cooling on/off using
leaving water temperature control"on page64.
To switch space cooling on/off using leaving water
temperature control
In this mode, cooling will be activated as required by the water
temperature setpoint. The setpoint can be set manually or through
the schedule timer.
1 Press to switch space cooling ( ) on/off.
Result: and the corresponding actual room temperature
setpoint appear on the display. The operation LED lights up.
2 Set the desired leaving water temperature using and
.
INFORMATION
Temperature range for cooling: 5°C~20°C (leaving water
temperature).
For setup of the schedule timer function, see "To program space
cooling"on page 67, "To program space heating" on page 67, and
"To program quiet mode"on page68.
INFORMATION
▪ 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 water 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
Setback operation and weather dependent setpoint are not
available in the cooling mode.
16.3.4 Space heating operation
Space heating is available for heat pump units only.
Space heating can be controlled in 2 different ways:
▪ based on room temperature
▪ based on leaving water temperature (default)
To switch space heating on/off using room
temperature control
Room temperature control
In this mode, heating will be activated as required by the room
temperature setpoint. The setpoint 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.
▪ It is possible that the leaving water temperature
becomes higher than the setpoint if the unit is
controlled by room temperature.
1 Press to switch space heating ( ) on/off.
Result: and the corresponding actual room temperature
setpoint appear on the display. The operation LED lights up.
2 Set the desired room temperature using and . In
order to avoid overheating, space heating cannot be used when
the outdoor ambient temperature rises above a certain
temperature (see "16.1 Operation range" on page 62). For
setup of the schedule timer function, see "16.3.6 Schedule
timer"on page65.
INFORMATION
Temperature range for heating: 16°C~32°C (room
temperature)
3 Select the leaving water temperature which you want to be
used to heat up your system using and . For
detailed information, see "To switch space heating on/off using
leaving water temperature control"on page65.
Automatic setback function
For the automatic setback function settings, see field setting [2] in
"7.2.9Field settings on the user interface"on page38.
INFORMATION
▪ flashes during setback operation.
▪ While room temperature setback function is active,
leaving water setback operation is also performed (see
"To switch space cooling on/off using leaving water
temperature control"on page64).
▪ Do not to set the setback value too low, especially
during colder periods (e.g. winter time). It is possible
that the room temperature cannot be reached (or it will
take much longer) because of the big temperature
difference.
The setback function provides the possibility to lower the room
temperature. It can be activated e.g. during the night, because
temperature demands during night and day are not the same.