AL-KO AT4F Series, Operating And Assembly Instruction Manual

Page: 87 / 140

Subject to changes in line with technical progress!
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Commissioning
6.2.1 Commissioning of the electric heating coil
ATTENTION
Electric heating coil
Check safety chain: Test the function of the flow monitor and temperature monitor and adjust
these if necessary. This is the only way to ensure safe operation of the air handling unit.
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Observe the operating instructions of the manufacturer.
Frequent causes of error for accumulated heat with electric air heaters
Cause Remedy
No air volume flow Check that the dampers are open.
Check the function of the fan unit.
Check if a foreign object has been drawn in.
Insufficient air volume flow through controlled fans Adjust the air volume in speed-controlled fans to the heating capacity.
Check that the dampers are open.
Check if a foreign object has been drawn in.
Temperature monitor is not connected The temperature monitor is mandatory and must be checked.
Safety temperature limiter is not connected The safety temperature limiter is mandatory and must be checked.
No fan delay The fan delay is absolutely necessary. If this is not the case, the electrical
circuit must be checked.
Incorrect commissioning – Checking the electric
heater without sufficient air flow due to closed
flaps or false air, for example
Ensure that there is always a sufficient air volume flow at the heating coil
during testing
Air temperatures above 40 °C Ensure that the air temperatures do not exceed 40 °C at any time.
The air temperature in normal operation (continuous operation) must not
exceed 40 °C
6.2.2 Commissioning of fans
WARNING
Risk of injury caused by impeller breakage
Operation with impermissibly high vibration values, in particular with fans without spiral
housing, can result in impeller breakage, which can lead to serious property damage and
personal injuries.
„
Perform a vibration measurement of the fan impeller regularly and document the checks.
If the permissible vibrations are exceeded, no operation may take place. Observe the table
with the respective vibration values.
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For speed control, the frequency converter must generally be operated without overmod-
ulation.
„
Evaluation via a separate PTC thermistor evaluation unit with corresponding ATEX ap-
proval or the supplied frequency converter, in combination with the additional MCB112
plug-in card.
„
During commissioning, determine the resonance speeds and eliminate them, e.g. by hid-
ing the frequencies on the frequency converter.
„
Do not operate fans in the range of the resonance speed (and its multiples) of the fan
motor system.
„
Operation with impermissibly high vibration values can result in impeller breakage, which
can lead to serious property damage and personal injuries. AL-KO THERM recommends
continuous monitoring using a vibration sensor (available as an option).
„
Only operate the fan when the fan is integrated into the unit potential.