48
Fläkt Woods
8666 GB 2010.06
Specifications are subject to alteration without notice
Installation and maintenance instructions
Control equipment
they are set to 500 Pa and may need to be adjusted to
improve performance. Remember that the measure-
ment range you set on the differential pressure sensors
must also be entered on the controller.
• The sensors have not been calibrated during the last
year. Zero calibrate them! You can read how this is
done on the sensor data sheet as well as in this docu-
ment in the section Pressure Sensor/Flow Transmitter,
page 19.
• The sensor measurement range has not been entered
on the controller. Compare the jumper settings on the
differential pressure sensors with the set measurement
range on the controller.
Diagnostic testing of the flow indicates that the flow
displayed has not been achieved.
• See the point above.
Why does the current flow setpoint/pressure setpoint
deviate from the setpoint values entered under “Flow
controller” and “Pressure controller” respectively?
• The set point values entered can deviate from the
current values if fan compensation is activated.
Temperature
The controller cannot maintain the set temperature.
What can be wrong?
• Is the heating coil/cooling coil dimensioned for the
prevailing outdoor temperature?
• Investigate whether the water temperature to the
heaters is sufficiently high/low?
• Investigate whether there is a power supply to the
electric heater.
• Ensure that there are no windows or doors open.
Temperatures have been checked. One sensor always
shows 1.8°C too little. Do we need to replace the sensor?
• No. It can be adjusted under:
MAIN INDEX
UNIT
INPUTS
TEMPERATURE
• Each sensor has a parameter, Calibration, which can be
used to adjust the value.
The display
The unit and control system are connected to the mains.
The LEDs on the controller light and flash, but no text is
displayed. How do I get it to appear?
• Disconnect the display cord from the unit.
Reconnect the cord to the unit.
• Check that the cable between the controller’s display
socket and the display socket on the front of the unit
is connected at both ends.
• Switch the main power switch off and on.
Do I need to remove the display cord before screwing the
control panel cover into place?
• No, the display cord is routed out through the cellular
plastic strip at the rear of the control panel with the
other cables.
How do I switch to English in the display?
1. Go to the following menu:
MAIN INDEX
SYSTEM OVERVIEW
LANGUAGE SELECTION
2. Change parameter: / Current Language
Pressure/Flow
The display shows that the flow/pressure is not zero,
despite the unit being switched off. Are the sensors faulty?
• The sensors must be zero calibrated on delivery as
well as annually. You can read how this is done on the
sensor data sheet as well as in this document in the
section Pressure/Flow Sensor DPT1000/3000.
• Is the damper closed? There might be an air flow
through the air handling unit.
The desired pressure setpoint/flow setpoint cannot be
achieved. Why?
• External pressure drop too high.
• A pressure hose may have become disconnected. Stop
the unit, open the hatches, look and rectify if necessary.
• The cap on an unused red measurement nipple (located
on the door pillar of the air handling unit) may have
come off. Reinstall the cap.
• Badly configured sensor. Open the cover of the diffe-
rential pressure sensors. Different measurement ranges
can be set using the jumpers. When differential pres -
sure sensors are factory fitted, the sensors are config-
ured at the factory. If the differential pressure sensors
are enclosed separately with the unit (pressure control)
Questions and answers
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