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VENTS NKP A21 Series

  • Description
  • Modifications
  • Capacity diagram
  • Downloads
  • Designation key
  • Compatibility table
  • Duct electric heater for heat exchanger freeze protection by means of supply air preheating and supply air duct temperature maintaining at a point that ensures heat exchanger freezing protection.
  • Compatible with round Ø125, 150, 160 and 200 mm air ducts.
  • The casing and the control box are made of galvanized steel and the heating elements are made of stainless steel.
  • The heater casing is extra heat insulated with 20 mm non-flammable mineral wool layer.
  • The heater spigots are rubber sealed for airtight connection to the air ducts.
  • The NKP A21 duct heaters are equipped with a power cable and a control cable for connection to a controller of an air handling unit.
  • Air temperature is controlled with a triac power controller that switches the maximum load on/off.
  • Load is commutated with a semiconductor (triac).
  • The heaters are equipped with overheat protection thermostats:
    ⏵self-resetting overheat protection thermostat actuated at +50 °С;
    ⏵emergency overheat protection thermostat actuated at +90 °С.
  • The heater design ensures its connection to round air ducts by means of the clamps from the delivery set.
  • The arrow on the heater casing must match the air flow direction in the system.
  • The heater is connected to a controller of an air handling unit via the supplied cable with socket connectors.
  • The control box cover must be directed upwards with the maximum deviation angle 90°.
  • The control box cover must not be directed downwards.
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Brochure "NKP" (pdf 532.31Kb)
Download high quality image "NKP" (psd 2.27Mb)
Download image "NKP" for your website (png 617.62Kb)
User's manual "NKP" (pdf 1.26Mb)
Designation key
Designation key
Series Connected air duct diameter [mm] - Heater power [kW] - Phase Compatability with automation
NKP 125; 150; 160; 200 0,6; 0,8; 1,2; 1,7; 2,0 1: single-phase А21: compatible with A21 automation
Compatibility table
Compatibility table
Heater model (connected air duct diameter)  
NKP 125 A21 VUT/VUE with Ø 125 mm spigot and A21 automation
NKP 150 A21 VUT/VUE with Ø 150 mm spigot and A21 automation
NKP 160 A21 VUT/VUE with Ø 160 mm spigot and A21 automation
NKP 200 A21 VUT/VUE with Ø 200 mm spigot and A21 automation
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