6.6 -
Calculating the space temperature
Up to two sensors (one of which is optional) may be used to
calculate the space temperature. Depending on the
configuration (see see GENCONF menu), space temperature is
either calculated as the average of all readings, or is taken
from the minimum or maximum reading.
6.7 -
Space temperature control point
Depending on the current operating type, the active setpoint
can be selected:
•
By choosing the item in the GENUNIT menu
•
Via the user’s volt-free contacts
•
Via network commands
•
Via the setpoint timer program (schedule 2).
•
The following tables summarise the possible selections
•
depending on the control types (local, remote or network)
•
and the following parameters:
•
Setpoint select in local control: item LSP_SEL in the
•
GENUNIT menu permits selection of the active setpoint,
•
if the unit is in local operating type.
•
Heating/cooling operating mode.
•
Setpoint selection contacts: Setpoint selection contact
•
status.
•
Schedule 2 status: Schedule for setpoint selection
LOCAL OPERATING MODE
6.8 - Offset
An offset means that the active space temperature setpoint
is altered in line with external parameters. This may be
carried out in one of the following ways:
•
By the user with the aid of an adjustment slider located on
the main T-56 space temperature sensor (optional). The
offset range is ± 3 K in increments of 1 K.
•
By the user with the aid of buttons located on the T-59 space
temperature sensor (optional).
The offset range is ± 3 K in increments of 0.5 K.
•
Automatically in cooling mode, by reference to the outdoor
temperature (if the function has been validated
in the HCCONFIG menu). In this case, the function is
generally used to limit the difference between the
indoor and outdoor temperatures in order to prevent thermal
shock.
IMPORTANT: It is not possible to use both types of offset
at the same time. If the offset from the T-56 or T-59 sensor
is non-zero, offset based on the outdoor temperature
isignored.
6.9 – Smart Start
This mode permits heating or cooling the room before it is
occupied so that the space temperature has reached its
setpoint at the beginning of the occupied period. The control
calculates an anticipated start-up value in minutes, based
on a user configurable factor (anticipated start-up factor
expessed in minutes/degrees that must be adjusted for the
installation) and the difference between the setpoint and
the space temperature. The higher the anticipated start-up
factor or the higher the setpoint difference, the earlier the
change-over to occupied mode is anticipated. However, the
start-up cannot be anticipated by more than 60 minutes.
6.10 –
Heating/cooling mode
Units with heat pumps or additional heating stages may
operate in either heating or cooling mode.
• Cooling mode is active when:
Space temperature is above: occ_cool (occupied
mode) or uno_cool (unoccupied mode)
• Heating mode is active when:
Space temperature is below: occ_heat (occupied
mode) or uno_heat (unoccupied mode)
• Units remains in ventilation mode (without cooling or
heating) when the space temperature is between occ_
heat and occ_cool (occupied mode) or uno_heat and
uno_cool (unoccupied mode).
6.11 -
Heat Cool changeover
Cooling/Heating changeover can be forced through
SmartVu or CCN. The machine will be forced to do only
heating or cooling upon the changeover parameter. When
the unit is forced to heating but it needs to do cooling
based on sensor, the unit will switch to standby. Same in
reverse case.
6.12 -
Frost protection mode
The unit may be configured to be in frost protection mode
when in unoccupied mode (GENCONF menu). In this case
the fan is shut down and is only authorised to restart if the
space temperature falls below the frost protection setpoint.
It shuts down again when space temperature is 1.5 K above
the frost protection setpoint. Selecting frost protection does
not affect how the unit operates in occupied mode. The
frost protection mode for unoccupied periods has to be
selected in the GENCONF menu.
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