TECHNICAL ANNEX
TIPS FOR HEATING INSTALLERS AND ELECTRICIANS
BERLIN 1000 / 2000 / 3000 – BIMETAL
PROBLEM
CAUSE
Large temperature variation present in the room (approx. 5 – 8 K).
1.) The neutral conductor N is not connected to terminal 4 of the controller.
2.) The neutral conductor N is connected to terminal 4 of the controller, but not in the distribution system (distribution box, fuse box).
The setting knob (setpoint transmitter) must be set higher than the desired room temperature.
1.) Incoming and outgoing (switched) phase have been interchanged. As a result, the feedback resistor continuously carries a voltage and acts like a temperature reducer in the room. Moreover, the tempera - ture variation is very high (approx. 5 – 8 K) 2.) The heating output is dimensioned too low for the room. As a result of this, the power-on time of the controller is too long; the feedback resistor is thus switched on for too long and acts as a temperature reducer in the room. 3.) External heat sources are influencing the controller (for example, the sun, TV, lamp etc.). These external heat sources cause the controller to register a higher-than-actual temperature and, as a result, the room is not heated sufficiently.
The setting knob (setpoint transmitter) must be set lower than the desired room temperature.
1.) The controller has been installed, for example, behind a curtain or on an outer wall or next to a door. The controller registers a lower-than-actual temperature and, as a result, the room is overheated.
The room does not become warm.
1.) Faulty actuator element, actuator element does not open the valve.
2.) There may be coarse construction site dirt in the controller. This dirt is preventing the contact from closing.
3.) The controllers of two rooms have been connected in series. These rooms only become warm when both controller contacts are closed.
TOPIC
NOTE
Reaction times – underfloor heating
1.) Particularly with floor heating, it is important to remember that there are very long reaction times. Therefore, the room heats up very slowly and also cools slowly (incident sunlight, for example, results in overheating). So do not expect that a cold room will reach the desired room temperature within a short time after having set the adjusting knob to a high value.
Room temperature in well-insulated rooms
2.) Also, with well insulated rooms, remember that the room temperature drops very slowly. As a result, it can happen that at night, despite ‘Reduced operation’ (for example, 4 K lower), the room temperature drops only a little and the heating therefore does not get activated for a prolonged time.
Installation instructions – bimetal controllers
3.) Very often, the function of bimetal controllers is impaired or rendered completely useless by construc - tion site dirt that has penetrated into them. Therefore, the controllers should be installed only after any required spatula, painting or wallpapering work. Avoid drilling dust without fail.
PLANT ENGINEERING
TOPIC
NOTE
Connecting industrial thermostats and controllers to PLC or DDC
For connecting industrial thermostats and controllers to programmable logic controllers (PLC) or direct digital controls (DDC), the use of normal commercial coupling relays with 230 V~ coil voltage and gold-plated switching contacts is recommended.
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Catalogue 2023
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