VENTS NKP 250-1,2-1 A21 V.2

Description
Characteristics
Capacity diagram
Downloads
Dimensions
Designation key
Compatibility table
Electric heater power selection diagram

Description

APPLICATION
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.
DESIGN
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.
MOUNTING
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.

Characteristics

Parameter	NKP 250-1,2-1 A21 V.2	Measurement unit
Minimum air capacity	180	m³/h
Current	5.2	A
Power	1200	W
Heating	electric preheating	-
Duct	for round air ducts	-
Connection diameter	250	mm

Capacity diagram

Selection method:
Air flow:
Pressure:

Operating point

Air flow: --
Pressure: ---

Files archieve

Downloads

Dimensions

Characteristics

Parameter	Value	Measurement unit
∅D	250	mm
B	287	mm
H	388	mm
L	307	mm
L1	192	mm

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

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

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.