Start-up, adjustments, use, commissioning and unit in hipernation |
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K.5.8.2 Control of heating capacity connected to unit without 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 heating capacity is adapted in steps.
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 connected to the electric heater. The separate controller is without supply dis-
connecting device.
K.5.9
Speed control of fans
K.5.9.1 Control system in the EC motors
Fan motor revolutions are controlled by the EC system that is integrated in the motors, and they are configured and
tested to comply with the data for the air handling unit.
K.5.9.2 Pressure transmitters
Separate control of the air flow or duct pressure for supply fan and for extract fan. The required air flow or duct pres-
sures with normal as well as reduced capacity are selected on the Systemair Control Panel. The actual pressure is meas-
ured by pressure transmitters. PI calculation in the controller continuously transmits the necessary revolutions for the
fans to the frequency converters to achieve the required pressure.
K.5.9.3 CO2-dependent air flow
The air flow is controlled by a CO
2
sensor. High CO
2
concentration is equal to higher air flow. Low CO
2
concentration is
equal to lower air flow. Based on the actual CO
2
level and a min/max level, the needed airflow is calculated. The speed
of each fan is adjusted via frequency converter. Terminals in the cabinet are available for connection of the sensor.
K.5.9.4 Humidity dependent air flow
The air flow is controlled by the humidity sensor. High humidity is equal to higher air flow. Low humidity is equal to low-
er air flow. Based on the actual humidity level and a min/max level the needed airflow is calculated. The speed of each
fan is adjusted via frequency converter. Terminals in the cabinet are available for connection of the sensor
K.5.10
Cabinet
K.5.10.1 Integrated cabinet in units with control system
Cabinet is integrated in the unit behind an inspection door. Terminals are installed in the cabinet for all external compo-
nents. The number of terminals is always adapted to the individual order.
K.5.10.2 Cabinet placed on the unit with control system
The models with the cabinet on the unit are exclusively for indoor installation. Terminals are installed in the cabinet for
all external components. The number of terminals is always adapted to the individual order.
K.5.11
Temperature sensors
Four sensors are always delivered with each unit. See below where the sensors are placed;
• 1 sensor in the extract air, installed inside the unit
• 1 sensor in the outdoor air, installed inside the unit before the supply air filter on the cold side of the heat exchanger
• 1 sensor in the supply air to be placed in the supply air duct by the installer
• 1 sensor in the exhaust, installed inside the unit
K.5.12
Damper motors
Four different types of damper motors are available;
• On/off damper motor, without spring return function. Torque is 20 Nm and run time is 150 seconds
• Modulating damper motor, without spring return function. Torque is 20 Nm and run time is 150 seconds
• On/off damper motor, with spring return function. Torque is 20 Nm and run time is 150/16 seconds
• Modulating damper motor, with spring return function. Torque is 20 Nm and run time is 150/16 seconds
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