The Vents NK 500x250-9.0-3 electric heater consists of a housing, a switching box and heating elements made of stainless steel, equipped with additional fins to increase the heat exchange area. NK duct heaters are equipped with two overheat protection thermostats:
- main protection with automatic restart (triggered at temperatures above +50°C). After cooling, the thermostat automatically closes the heater control circuit.
- emergency protection with manual restart (triggered at temperatures above +90°C). In the event of an alarm, power can only be supplied to the heater after a manual reset of the alarm.
For each standard size there are several power options. Greater power can be achieved by installing heaters in series one after another.
Installation
The heater is installed using a flange connection. The direction of air movement must correspond to the arrow on the heater. Duct heaters can be installed in any position, except for the position with the electrical panel at the bottom (the danger of condensation flowing in and short-circuiting the electrical wiring). It is recommended that they be installed so that the air flow is evenly distributed over the entire cross-section. An air filter must be installed in front of the heater to protect the heating elements from contamination.
The recommended distance between the heater and the rest of the system elements should be no less than the diagonal of the heater, i.e. the distance from corner to corner in its air duct part. Duct heaters are designed for a minimum air flow speed of 1.5 m/s and the maximum operating temperature of the exhaust air is 40°C. If a fan speed controller is used, it is necessary to ensure a minimum air flow through the heater.
It is prohibited to supply power voltage to the heater when the fan is turned off.
For proper and safe operation of heaters, it is recommended to use an automation system that provides comprehensive control and protection:
- automatic adjustment of power and air heating temperature,
- monitoring filter status using a differential pressure sensor
- blocking the power supply to the heater in case of a stop of the supply fan or a decrease in the air flow rate, as well as when the built-in overheating protection thermostats are triggered
- shutdown ventilation systems with purging of heating elements of the heater.
Technical characteristics
| Parameter | Value |
| Minimum air flow, m3/h | 660 |
| Current, A | 13 |
| Voltage, B | 400 | Power, W | 9000 |
| Number of heating elements x power, kW | 3x3.0 |
| Weight, kg | 7.65 |
Dimensions
| Dimensions | B | B1 | B2 | B3 | H | H1 | H2 | L < /td> |
| mm< /strong> | 500 | 520 | 540 | 640 | 250 | 270 < /td> | 290 | 200 |
Diagram of pressure drop with increasing air flow through the heater
Documentation
