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COMPACT
COMPACT Control System
COMPACT Control System
Control Possibilities
The IQnomic Plus, an extra module for the air handling
unit’s control system is required for controlling water-
based cooling.
The regular outputs of the air handling unit are used for
controlling cooling with direct expansion. If none of these
are sufficient for cooling, the IQnomic Plus can be used.
The following control possibilities are available for control-
ling other types of cooling equipement:
• DX-cooling, 1 step
Connection to independent contacts for starting/stop-
ping the cooling unit.
• DX-cooling, 2 steps
Connection to two independent contacts for control-
ling cooling in two steps.
• DX-cooling, 3 steps, binary mode
Connection to two independent contacts for control-
ling cooling in three steps.
• Stepless control, 0-10 V DC
Connection to a 0-10 V DC control signal for variable
control of a cooling coil/cooling unit. A 24 V DC power
supply for the damper actuator is also ready-to-use in
the COMPACT.
• Stepless control, 10-0 V DC
Same as item 4, but the control signal is inverted.
Functions
Cooling, Min. Airflow
If the unit's airflow is lower that this limit, the cooling
function will be blocked.
Restarting Period
The restarting period is the period from when the cool-
ing unit has stopped until when it can start up again. The
time delay prevents the cooling unit from starting and
stopping continuously.
Neutral Zone
The neutral zone between the setpoint for cooling and
the setpoint for heating can be preset for preventing the
cooling and heating systems from operating too closely to
one other.
Outdoor Temperature Limited Start
If DX cooling is used, it is possible to set the outdoor tem-
perature limit at which the cooling unit is allowed to start.
Each step has a separate minimum permissible outdoor
temperature setting for starting the cooling unit.
Pump Control
If an air cooler for chilled water is used, there is provision
for controlling the pump. Other times, the pump is exer-
cised at regular intervals.
Control Reaction Speed
The control reaction speed denotes the time delay be-
tween various cooling steps to enable the provision of
cooling capacity from a compressor, for instance, before
switchover to the next step occurs.
Cooling BOOST
Cooling BOOST involves increasing the supply air and ex-
tract air airflows to convey more cooling energy to the
premises.
The flow increase takes place between current flow and
preset max. flow. Start limits in relation to the setpoint for
minimum supply air temperature can be preset.
This function cannot be combined with pressure regula-
tion.
The function can be selected in five variants as follows:
• Comfort
Cooling BOOST Comfort involves first starting the cool-
ing equipment when cooling is required and then in-
creasing the airflow.
• Economy
Cooling BOOST Economy involves first increasing the
airflow when cooling is required and then starting the
cooling equipment.
The function can also operate without the cooling
function activated.
The function requires that the outdoor air temperature
is at least 2 °C lower than the extract air temperature
in order to be activated. Normal cooling operation is
activated if the temperature difference is too small.
• Sequence
The cooling BOOST Sequence is used if a cooling unit is
sized for a higher cooling flow than normal flow.
If there is a cooling load, the flow is increased up to the
preset max. flow before the cooling function is activat-
ed. The cooling function is delayed 1 minute after the
airflow is increased.
• Comfort + Economy
The comfort variant and the economy variant can be
combined.
• Economy + Sequence
The economy variant and the sequence variant can be
combined.
Cooling
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