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    VENTS NKD A21 V.2 series

    VENTS NKD A21 V.2 series
    VENTS NKD A21 V.2 series
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    Duct heater for supply air post-heating with external control
    Model features
    • For round ducts
    • Ventilation accessories
    Series of products
    VENTS NKD 125-0,6-1 A21 V.2
    VENTS NKD 125-0,6-1 A21 V.2
    VENTS NKD 125-0,8-1 A21 V.2
    VENTS NKD 125-0,8-1 A21 V.2
    VENTS NKD 125-1,2-1 A21 V.2
    VENTS NKD 125-1,2-1 A21 V.2
    VENTS NKD 150-0,8-1 A21 V.2
    VENTS NKD 150-0,8-1 A21 V.2
    VENTS NKD 150-1,2-1 A21 V.2
    VENTS NKD 150-1,2-1 A21 V.2
    VENTS NKD 150-1,7-1 A21 V.2
    VENTS NKD 150-1,7-1 A21 V.2
    VENTS NKD 150-2,0-1 A21 V.2
    VENTS NKD 150-2,0-1 A21 V.2
    VENTS NKD 160-0,8-1 A21 V.2
    VENTS NKD 160-0,8-1 A21 V.2
    VENTS NKD 160-1,2-1 A21 V.2
    VENTS NKD 160-1,2-1 A21 V.2
    VENTS NKD 160-1,7-1 A21 V.2
    VENTS NKD 160-1,7-1 A21 V.2
    VENTS NKD 160-2,0-1 A21 V.2
    VENTS NKD 160-2,0-1 A21 V.2
    VENTS NKD 200-1,2-1 A21 V.2
    VENTS NKD 200-1,2-1 A21 V.2
    VENTS NKD 200-1,7-1 A21 V.2
    VENTS NKD 200-1,7-1 A21 V.2
    VENTS NKD 200-2,0-1 A21 V.2
    VENTS NKD 200-2,0-1 A21 V.2
    VENTS NKD 250-1,2-1 A21 V.2
    VENTS NKD 250-1,2-1 A21 V.2
    VENTS NKD 250-2,0-1 A21 V.2
    VENTS NKD 250-2,0-1 A21 V.2
    VENTS NKD 250-3,0-1 A21 V.2
    VENTS NKD 250-3,0-1 A21 V.2
    VENTS NKD 315-2,0-1 A21 V.2
    VENTS NKD 315-2,0-1 A21 V.2
    VENTS NKD 315-3,0-1 A21 V.2
    VENTS NKD 315-3,0-1 A21 V.2
    • Description
    • Modifications
    • Downloads
    • Designation key
    • Compatibility table
    • Electric heater power selection diagram
    Description
    Description
    APPLICATION  
    • 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.
    DESIGN  
    • 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.
    • NKD A21 V.2 duct heaters are equipped with a factory-wired power cable and a control cable, and also have a duct temperature sensor that is connected to the ventilation unit.
    • Temperature control is carried out smoothly by the ventilation unit controller due to the PWM signal in cycles of 10 seconds.
    • 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
    MOUNTING  
    • 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.
    • 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.
    Modifications
    Modification name
    NKD 250-3,0-1 A21 V.2
    NKD 125-0,6-1 A21 V.2
    NKD 200-2,0-1 A21 V.2
    NKD 160-2,0-1 A21 V.2
    NKD 160-0,8-1 A21 V.2
    NKD 150-1,2-1 A21 V.2
    NKD 315-2,0-1 A21 V.2
    NKD 125-0,8-1 A21 V.2
    NKD 250-1,2-1 A21 V.2
    NKD 200-1,2-1 A21 V.2
    NKD 160-1,2-1 A21 V.2
    NKD 150-1,7-1 A21 V.2
    NKD 315-3,0-1 A21 V.2
    NKD 125-1,2-1 A21 V.2
    NKD 250-2,0-1 A21 V.2
    NKD 200-1,7-1 A21 V.2
    NKD 160-1,7-1 A21 V.2
    NKD 150-2,0-1 A21 V.2
    NKD 150-0,8-1 A21 V.2
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    Downloads
    Downloads
    Select document type
    • Advertising and printing products
    • Certificates
    • Technical documentation
    Name
    Download
    Show
    "NKD A21 V.2" product description 10-2021 (pdf 481.66Kb)
    "NKD A21 V.2" user's manual 09-2021 (V249EN-01) (pdf 1.37Mb)
    Download high quality image "NKD A21 V.2" (psd 2.25Mb)
    Download image "NKD A21 V.2" for your website (png 476.03Kb)
    Designation key
    Designation key
    Series Connected air duct diameter [mm] - Heater power [kW] - Phases Options
    NKD 125; 150; 160; 200; 250; 315 0.6; 0.8; 1.2; 1.7; 2.0; 3.0 1: single-phase A21 V.2: compatible with A21 automation, without a DB-9M connector
    Compatibility table
    Compatibility table
    Heater model (connected air duct diameter)  
    NKD 125 A21 V.2 VUT/VUE VB EC A21
    NKD 150 A21 V.2 VUT/VUE VB EC A21
    NKD 160 A21 V.2 VUT/VUE VB EC A21
    NKD 200 A21 V.2 VUT/VUE VB EC A21
    NKD 250 А21 V.2 VUT/VUE VB EC A21
    NKD 315 A21 V.2 AirVents with a 315 mm spigot and an A21 automation without a DB-9M connector
    Electric heater power selection diagram
    Electric heater power selection diagram

    The NKD A21 V.2 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 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 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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