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VENTS NKP 150-1,2-1 A21 V.2

Heater for heat exchanger freeze protection.
Connected air duct diameter – 150 mm.
Heater power – 1.2 kW.

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Designation key
  • Compatibility table
  • Electric heater power selection diagram
  • 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, 200, 250 and 315 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 V.2 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 +60 °C.
    ⏵emergency overheat protection thermostat actuated at +90 °C.
  • 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 controlled by the ventilation unit through the cable supplied and already connected to the heater at the factory.
  • The control box cover must be directed upwards with the maximum deviation angle 90°.
  • The control box cover must not be directed downwards.
Parameter NKP 150-1,2-1 A21 V.2
Measurement unit
Minimum air capacity 90 m³/h
Current 5.2 A
Power 1200 W
Heating electric preheating -
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
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"NKP A21 V.2" product description 10-2021 (pdf 473.53Kb)
"NKP A21 V.2" user's manual 09-2021 (V249EN-01) (pdf 1.37Mb)
Download high quality image "NKP A21 V.2" (psd 2.26Mb)
Download image "NKP A21 V.2" for your website (png 477.82Kb)
VENTS NKP 150-1,2-1 A21 V.2
Parameter Value Measurement unit
∅D 150 mm
B 189 mm
H 280 mm
L 306 mm
L1 192 mm
Designation key
Designation key
Series Connected air duct diameter [mm] - Heater power, kW - Phase Options
NKP 125; 150; 160; 200; 250; 315 0.6; 0.8; 1.2; 1.7; 2.0; 3.0 1: single-phase А21 V.2: compatible with А21 automation, without a DB-9M connector
Compatibility table
Compatibility table
Heater model (connected air duct diameter)  
NKP 125 А21 V.2 VUT/VUE VB EC A21
NKP 150 А21 V.2 VUT/VUE VB EC A21
NKP 160 А21 V.2 VUT/VUE VB EC A21
NKP 200 А21 V.2 VUT/VUE VB EC A21
NKP 250 А21 V.2 VUT/VUE VB EC A21
NKP 315 А21 V.2 AirVents with a 315 mm spigot and an A21 automation
Electric heater power selection diagram
Electric heater power selection diagram

How to use electric heater diagrams

  • Selection of the NKP A21 V.2 heater model compatible with VUT 350 VB EC A21 air handling unit. The rated winter outside air temperature is -15 °С. The rated air flow is 220 m³/h. Starting from the rated winter outside air temperature (1) draw a horizontal line till the air flow axis (2). The NKP A21 V.2 heater with heating capacity 1200 W is able to provide efficient heat exchanger freeze protection.
  • The NKP 160-1,2-1 A21 V.2 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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