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| Start-up, adjustments, use, commissioning and unit in hipernation
K.5.2
Extended operation and external start/stop (for example by presence detectors)
When the unit is running at reduced speed or is in shutdown mode, it can be forced up one step by using a Push button
(impulse). The required number of minutes for the extended operation must be selected on the Systemair Control Panel.
Button and cable are not delivered by Systemair. Furthermore when the unit is in shutdown mode it is possible to start/
stop the unit by presence detectors. Presence detectors and cable are not delivered by Systemair.
K.5.3
Valve and valve motor for heating coil
The supply voltage for the water valve actuator is 24V AC, the control signal is 0-10 V. The sensor for water tempera-
ture has to be installed in the heating coil and the sensor is provided with cable but not connected to the terminals in
the cabinet. The cable between valve motor and terminals in the cabinet is not delivered by Systemair. Standard valves
are available for 2 or 3-way connection.
K.5.4
Valve and valve motor for cooling coil
The supply voltage for the water valve actuator is 24V AC, the control signal is 0-10 V. Cables between valve motor
and terminals in the cabinet are not delivered by Systemair. Standard valves are available for 2 or 3-way connection.
K.5.5
DX cooling
A DX-cooler can be connected to the controller. Input and output are available for:
Start cooling – Alarm cooling – Cooling Y3. Cables are not delivered by Systemair
K.5.6
Circulation pump, heating
Circulation pump is not included in the delivery from Systemair. If the pump has not been activated for 24 hours, the
pump is exercised once daily for 1 minute to keep the pump in a good condition. Cables are not delivered by Systemair.
K.5.7
Fire alarm function
K.5.7.1 External fire signal that indicate block or run
The unit is available without components for this function. The controller is as standard configured for ordinary running
when the contact is closed (NC). By open contacts the fans stop and the dampers close. If disconnected, fire is indicated
and the unit will stop until the signal is re-connected. On the site qualified technicians are able to change the
configuration.
K.5.7.2 External fire signal
The unit is delivered without components for this function. The controller is as standard configured for ordinary running
when the contact is closed (NC). By open contacts the fans stop and the dampers close. When the unit has been shut
down by a fire signal, the unit has to be restarted on the control panel. On the site qualified technicians are able to
change the configuration.
K.5.7.3 Two fire thermostats
The unit is available with 2 thermostats installed in the unit – 1 in the extract air and 1 in the supply air. The cut-off tem-
perature in the thermostats is adjustable between 40 and 70˚C. At the factory supply is set at 70˚C and extract is set at
40˚C. The controller is as standard configured to stop the fans and close the dampers if a thermostat is released. On the
site qualified technicians are able to change the configuration.
K.5.7.4 One smoke detector in extract air
The smoke detector has been installed in extract air next to the fan. The controller is as standard configured to stop the
fans and close the dampers if the detector is released by smoke. When the unit has been shut down by a fire signal, the
unit has to be restarted on the control panel. On the site qualified technicians are able to change the configuration.
K.5.8
Electrical heater battery
K.5.8.1 Control of heating capacity connected to unit with Systemair control system
Electrical heater installed with separate controller beside the heater. The separate controller is designed for capacity
conversion of the 0-10 V control signal from the main control system. The electric heater is not supplied from the air
handling unit cabinet as the cabinet is not designed to supply the heater with power. No power supply cables are con-
nected to the electric heater. The separate controller is without supply disconnecting device.
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