CVA NV PTC/PS • Electric heater battery

Circular Heater Battery
Electric
240Volt 1 Phase
Built in controls [inc airflow and pressure switch]
Duct mounted
Temperature , airflow and pressure switch

Circular electrical heating battery with built-in pulser for proportional control, the setpoint of the temperature is set by means of a potentiometer on the battery, maximal outlet temperature of 50°C. The minimal air velocity of 1,5 m/s trough the battery is required. Available in diameter 125 up to 400 mm and in power range from 300 up to 3000 W (others available on request). Operating voltage 230 or 400 V AC.

Note:

Refer to Heater lid for wiring diagram

TJ-K10K Supply air temperature sensor is included in the box

Application

Pre-heater
Constant supply air temperature

Material

Casing made of aluzinc coated steel, with rubber rings on either side for air tightness
Heating elements made of stainless steel ASI 304

Specifications

Two-stage overheat protection: the first stage switches on when the temperature reaches 50°C (resets automatically), the second stage switches on when the temperature reaches 100°C (is reset manually with pushbutton on the casing).
Setpoint temperature range : -10° to +50°C.

Accessories

Duct temperature sensors, type TJ-K10K

Mounting

Circulair ducts

Text for tender

Duct heaters are designed to heat pre filtered clean air in ventilation systems and to preheat air handling units. Corrosion resistant casing with excellent thermal reflectivity is made from AluZinc. Duct connection is with rolled rubber seals, duct heater elements are made from stainless steel.

To ensure safety in duct heaters are installed 2 protection thermostats and screw terminals for easy connection. Heaters casings are produced from AluZinc coated steel and heating elements from stainless steel AISI 304. AluZinc casing was selected because for its properties:

• Good corrosion resistance at high temperatures (up to 315 °C)

• Excellent thermal reflectivity

• Good abrasion resistance because of its surface hardness

• Durability: under normal conditions the AZ 150 coating grade will protect the steel substrate from corrosion for a minimum period of 15 years.

The duct heaters are designed for a minimum air velocity of 1,5 m/s. If the air flow is lower than 1.5 m/s it can often be activated overheat protection. To ensure security in case of fire in all electric air heaters 2 heat protection thermostats are installed:

• First overheat protection automatically activates if temperature reaches 50°C, then protection disconnects heating elements, until it has cooled. When the temperature falls to the working temperature, heater automatically switches on.

• Second overheat protection automatically activates if temperature reaches 100°C, then protection disconnects heating elements, until it has cooled. In this case need to figure the cause of the overheating of the heater. Heater needs to be reset manually with the pushbutton on the heaters casing.

For easy duct connection heaters casing is with rolled rubber seals.

Electric duct heaters with built-in control has installed internal controller EKR-KN which works by algorithm impulse/pause..., that enables fine temperature control.

Regulator controls load by triacs without moving parts, which causes no-noise commutation. Following models of heaters are with internals controllers, and there are differences between them:

* Type NV PTC/PS – heater with installed air flow sensor and pressure sensor.*