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VENTS NKD 150-0,8-1 A21

Duct heater for supply air post-heating with external control. Heater power – 0.8 kW.

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Designation key
  • Compatibility table
  • Electric heater power selection diagram
  • The heater is designed for integration into a ventilation system and joint operation with an air handling unit equipped with a control system used to switch on the heater and control its operation.
  • The heater maintains the supply duct air temperature at a point set by the unit controller.
  • The casing, the junction box and the heater cover are made of galvanized steel with the heating elements in stainless steel. The heater casing is additionally heat-insulated with 20 mm non-flammable mineral wool layer. The heaters are equipped with rubber seals for airtight connection to the air ducts.
  • The NKD duct heaters are equipped with a power and a signal cable for connection of the heater to the air handling unit controller.
  • The temperature is controlled by a triac power controller by means of switching the full load on and off.
  • Load commutation is carried out by the semiconductor device (triac).
  • The heaters are equipped with overheat thermostats:
    ⏵main overheat protection with automatic reset at +50 °C;
    ⏵emergency overheat protection with manual reset at +90 °C.
  • The heater design ensures its mounting on the round ducts in any position by means of clamps (included in delivery).
  • The air flow direction shall match the direction of the arrow on the heater casing.
  • The heater is connected to the air handling unit controller using the cable with connectors.
  • In case of horizontal mounting the control box must be installed with the cover upwards.
  • Swivel range from the normal position up to max. 90°.
  • Do not install the control box with the cover downwards.
Parameter NKD 150-0,8-1 A21
Measurement unit
Minimum air capacity 80 m³/h
Current 3.5 A
Power 800 W
Heating electric heating -
Duct for round air ducts -
Connection diameter 150 mm
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Files archieve
Brochure "NKD" (pdf 408.16Kb)
User's manual "NKD" (pdf 1.41Mb)
Download high quality image "NKD" (psd 2.13Mb)
Download image "NKD" for your website (png 285.82Kb)
User’s manual "Wireless control system A21" (pdf 2.46Mb)
VENTS NKD 150-0,8-1 A21
Parameter Value Measurement unit
∅D 149 mm
B 170 mm
H 282 mm
L 306 mm
L1 190 mm
Designation key
Designation key
Series Connected air duct diameter [mm] - Heater power [kW] - Phases Compatability with automation
NKD 125; 150; 160; 200; 250 0.6; 0.8; 1.2; 1.7; 2.0; 3.0 1: single-phase A21: compatible with A21 automation
Compatibility table
Compatibility table
Heater model (connected air duct diameter)  
NKD 125 A21 VUT/VUE with Ø 125 mm spigot and A21 automation
NKD 150 A21 VUT/VUE with Ø 150 mm spigot and A21 automation
NKD 160 A21 VUT/VUE with Ø 160 mm spigot and A21 automation
NKD 200 A21 VUT/VUE with Ø 200 mm spigot and A21 automation
NKD 250 А21 VUT/VUE with Ø 250 mm spigot and A21 automation
Electric heater power selection diagram
Electric heater power selection diagram

The NKD heater parameters calculation example:

  • It is necessary to select a heater for supply air post-heating to a temperature of +24 °C, provided the temperature downstream of the heat exchanger is +17 °C. Therefore, it is essential to increase temperature by 7 °C. The ventilation system incorporates the VENTS VUT 350 VB EC A21 air handling unit. The rated air flow is 400 m³/h. Determine the intersection of the post-heating temperature line (+7 °C) and the rated air flow line (400 m³/h).
  • In this case the 1200 W heater capacity provides necessary post-heating (+7 °C). The heater NKD 160-1.2-1 with the diameter matching the spigot diameter of the VUT 350 VB EC A21 air handling unit is a suitable model.
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