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VFLPG/VFL/VTL/VRA
No heating
•
Check whether or not the overheating cut-out, with manual reset, has been activated. If it has, then eliminate the
fault and reset it. Read furthermore the paragraph "Overheating" at page 8.
•
Check the overheating cut-outs and the heating elements by measurment.
•
Check whether or not there is mains voltage at the heater terminal blocks. Check the interlocking devices, fuses,
breakers, etc.
•
Disconnect the sensor from the terminals.
If the heater starts now, then the fault is in the external sensor circuitry. Otherwise, the fault is in the regulator
(Pulser/TTC).
-
MTX / -MTXL (-MTY / -MTYL)
-
MTC / -MTCL
-
MTP / -MTPL
•
Make sure that the control signal has the correct polarity.
Full heating power but no regulation
•
Disconnect the excitation signal wiring and strap/short-circuit the excitation signal input terminals. If this results in
the heating now being turned off, then the fault is in the external control signal.
No heating
•
Check whether or not the overheating cut-out, with manual reset, has been activated. If it has, then eliminate the
fault and reset it. Read furthermore the paragraph "Overheating" at page 8.
•
Check the overheating cut-outs and the heating elements by measurment.
•
Check whether or not there is mains voltage at the heater terminal blocks. Check the interlocking devices, fuses,
breakers, etc.
•
Disconnect the excitation signal wiring and connect a 9V battery-cell or another suitable voltage source as a control
signal, if the type of heater is -MTX / -MTXL / -MTY / -MTYL / -MTP / -MTPL .
If the type of heater is an -MTC / -MTCL a 470Ω resistor has to be connected in series with the 9V battery-cell to
be used as an control signal.
If the heater doesn't start now, then the fault is in the regulator (Pulser/TTC).
Connection
1. The duct heater comes with overheating protection. The number and their setting depend on the duct dimensions and
the intended usage.
2. Heaters may be supplied with overheating protection that has an alternating contact function, or otherwise a relay
may be included in the connection. Alternating contacts, or the relay connectors, can be used as an alarm function to
indicate that the overheating protection has been triggered. The relay connectors may not be used for interlocking,
only for indication.
3. The heater overheating protection must always be part of the control equipment circuit. It is not recommended that
the overheating protection function is controlled by an electronic circuit. It must be established that the heating
output is disconnected if the overheating protection is triggered.
4. The heater may have a number of power stages, which is indicated on the wiring diagram on the inside of the heater
cover.
5. As the sensor circuit for MTEM/MTEML type heaters with rated current ≤40 A is not galvanically separated from
the heater's power supply, the sensors and set point potentiometers should be installed considering that they have
mains supply potential.
6. With rated voltage >415 V3~ for MTEM/MTEML type heaters with rated current ≤40 A, duct sensors must be
installed so that they cannot be removed without tools, see page 20. Room sensors/set point controllers must also be
of type TG-R930.
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