Range NVe

link to air heaters NVe

Control and monitorig of electrical air heaters

Cram propose a four variants for proportional control of heat power of electrical air heaters range NV.e:

  • NV.e/R (Variant ) - Protection against overheating the body and control of room/zone temperature;
  • NV.e/R.T (Variant ) - Protection against overheating the body, control of room/zone temperature and control of the temperature of the delivered air;

 

For all variants the control is performed from three-phase synchronous switcher. The switch on and off of the full power is accomplish during the zero cross of the sine curve, in order not to cause any interferences.

For the all four variants the air heaters be provide with protection against overheating the body over 60 0C.

 

Variant

 

The control of room temperature is accomplished with a proportonal room thermoregulator (PRT), in range from 50C to 300C. The temperature sensor can be built-in the PRT or out of him:

Protections: Protection against overheating the body over 600C (). By the exceeding this margin of safety, the heating tubes turn off and a signal is switch on. Below 550C, the heating tubes turn on and the signal is switch of:

Connections:

  • One change-over contact for signalize the overheating the body -5 250 VAC
  • Signal mult conductor 30.75mm2 for connection with PRT.
  • Power cable:
  • - The air-heaters be completed with cable connections suitables to yours installed power.

    - Is not permissible to utilize cables with different section from this nominal for the providet cable connections.

 

Variant I

The control of room temperature is accomplished with a proportonal room thermoregulator (PRT), in range from 50C to 300C. The temperature sensor can be built-in the PRT or out of him:

Protections:

  1. Protection against overheating the body over 600C ().
  2. - By the exceeding this margin of safety, the heating tubes turn off and a signal is switch on. Below 550C, the heating tubes turn on and the signal is switch of:

  3. Control to the temperature of delivered air;
  4. - By temperature of delivered air below 15 0C, the heating tubes turn on and maintain this temperature irrespective of the thermoregulator (PRT)

    - By the exceeding this temperature over 45 0C, the heating tubes turn off and below 42 0C the heating tubes turn of and the thermoregulator (PRT) be with priority.

Connections:

  • One change-over contact for signalize the overheating the body -5 250 VAC;
  • Signal mult conductor 30.75mm2 for connection with PRT;
  • Signal mult conductor 20.75mm2 for connection with the built in the air duct thermal sensor lim and
  • Power cable:
  • - The air-heaters be completed with cable connections suitables to yours installed power.

    - Is not permissible to utilize cables with different section from this nominal for the providet cable connections.

 

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