VENTS VUT WH EC

Description

VUT WH EC air handling units with water heating coils are the complete ventilation units designed to provide both supply and exhaust ventilation, air filtration and cleaning as well as removal of contaminated exhaust air. The exhaust air energy is transferred to supply air through the plate heat exchanger. Applied in ventilation and conditioning systems for various premises requiring economic solution and controllable air exchange. EC-motors reduce energy consumption by 1.5-3 times and ensure high efficiency and low noise level at the same time. All the models are compatible with Ø 150, 160 and 200 mm round ducts.

Modifications

VUT WH EC – a range of compact Energy saving Air Handling Units (AHU) equipped with supply and exhaust centrifugal fans with EC motors, counter-flow heat recovery elements, water or glycol heating coils and air filters.

Casing

The casing is manufactured from aluminum-zinc compound with internal 25 mm mineral wool heat- and sound- insulating layer.

Filter

Two incorporated G4 panel filters for extract air ventilation and F7 filters for supply air ventilation are supplied with the unit.

Fans

The double inlet impellers with forward curved blades are powered by high efficient electronically commutated (EC) direct current motors with external rotor. As of today, such motor type is the most advanced solution for energy saving. EC-motors are featured with high efficiency and the best control over the whole fan speed range. Premium efficiency (reaching 90%) is an absolute advantage of the electronically commutated motors.

Heat recovery

The units are equipped with the high efficient heat exchangers reaching up to 95%. VUT WH EC models are fitted with the counter-flow heat exchangers made of polystyrene. The unit is equipped with the drain pan at the bottom of the heat exchanger for condensate drainage.

Heater

The water heater at outlet from the heat exchanger is designed for warming up of supply air up to the set level if heat recovery is not enough to attain the set supply air temperature. The water heaters are designed for max. operating pressure 1.0 MPa (10 bar) and max. heat medium operating temperature 95 °C.

Control and automation

The unit incorporates an integrated automation and control system with a multi-functional control panel with LCD display. The standard delivery set includes 10 m connection cable for connection to the remote control panel. The unit has the freezing protection function to prevent the heat exchanger freezing by means of actuating the bypass damper and controlling water heater. As the temperature sensor warns of the freezing danger, the bypass air damper is opened and the intake air is directed through the air duct beside the heat exchanger. As the heat exchanger is warmed the supply air temperature rises up to the set level while passing through the heater. Meanwhile the warm extract air warms up the heat exchanger. After the freezing danger is no longer imminent, the bypass damper shuts the bypass duct and the unit reverts to the standard operation mode.

VUT WH EC control and protection functions

• control from the control panel: switching the unit on/off, room temperature display, fan speed selection (low/medium/high speed);
• each fan speed is 100% adjustable both for supply and exhaust fan during the system setup;
• maintaining supply air temperature set from the control panel by controlling the circulation pump and actuating the heat medium regulating valve;
• freezing protection of the water heating coils by the exhaust temperature sensor and the return heat medium temperature sensor;
• safe start-up/ shutdown of the fans, warming up of the water heater before start-up; maintaining the set return heat medium temperature when the fan is off;
• actuating the external air dampers with a return spring;
• unit shut down at signal from the fire alarm system;
• smooth bypass damper control in the bypassing mode to prevent the heat exchanger freezing.

Offered options to the units

SF

Mounting

The unit is designed for indoor mounting. While mounting the unit provide the correct condensate collection and drainage. Access for the unit servicing and filter cleaning is from the side panels.

Accessories

For attenuation of sound generated by the fans it is recommended to install the duct silencer (refer SR) from inside before the unit. For vibration absorbing it is recommended to install the flexible anti-vibration connectors (refer VVG) on both sides of the unit.

The VUT WH units are recommended to be equipped with automatic air dampers for the water heater freezing protection when the fans are off. The mixing units USWK are recommended for smooth supply air temperature regulation in the units equipped with water heaters. The mixing unit USWK with three-way heat medium regulating valve and circulation pump provides smooth heating capacity regulation and minimizes the water heater freezing danger.