![background image](http://html1.mh-extra.com/html/veab-heat-tech/mqc/mqc_manual_858408011.webp)
11
VFLPG/VFL/VTL/VRA
- MQX / -MQXL (-MQY / -MQYL)
- MQC / -MQCL
- MQP / -MQPL
• Make sure that the control signal has the correct polarity.
• The air flow sensor needs to warm up for a couple of minutes once the heater is connected to mains electricity.
During the warming up time, the yellow LED light will be on, including when the air flow through the heater is
sufficient.
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 9.
• 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 -MQX / -MQXL / -MQY / -MQYL / -MQP / -MQPL . If the type of heater is an
-MQC / -MQCL 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).
• Check that the airflow through the heater is sufficient. The airflow is insufficient if the yellow LED on the PCB is
light up, alternatively the airflow might be sufficient but too turbulent for the electronics to sense the airflow correctly
and then the yellow LED will remain light up and the loss of heat will also remain.
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. 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 MQEM/MQEML 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 MQEM/MQEML type heaters with rated current ≤40 A, duct sensors must be
installed so that they cannot be removed without tools, see page 39. Room sensors/set point controllers must also be
of type TG-R930.
Содержание MQC
Страница 29: ...29 VFLPG VFL VTL VRA 1 40 2 VFLPG VFL VTL VRA 3 4 5 6 7 8 9 100 1 2 24 3 1 2 3...
Страница 30: ...30 VFLPG VFL VTL VRA MQEM MQEML Pulser TTC 37 38 0 30 10k 30 C 11 7k 20 C 15k 0 C 0 5k MIN MAX 29 Pulser TTC...
Страница 35: ...MQEM MQEML 35 VFLPG VFL VTL VRA...
Страница 44: ...44 VFLPG VFL VTL VRA MQX MQXL MQY MQYL...
Страница 48: ...48 VFLPG VFL VTL VRA MQC MQCL...
Страница 53: ...53 VFLPG VFL VTL VRA MQP MQPL...
Страница 54: ...54 VFLPG VFL VTL VRA...
Страница 55: ...55 VFLPG VFL VTL VRA...