Can be equipped either with centrifugal fans of double width (DIDW) or with free flow plug fans. The centrifugal fans can be either low pressure type with forward blades or high pressure type with backward curved blades, forefinger backward curved blades or aerofoil curved blades. All centrifugal fans are available with frame R, K, K1 and K2 types according to the operation static pressure after manufactured all fans impellers are statically and dynamically balanced accoding to ISO1940, thus eliminating any possibility of vibration. All fan supplied in Klimallco MDK series are tested in a registred laboratory in accordance with ANSI/AMCA 210 laboratory Methods of Testing Fans for Rating and AMCA 300 Reverberant Room Method for Sound Testing of Fans.
Transmission is effected via V-belts and pulleys with taper lock bushing, adjustable pulleys up to size 180 mm can be supplied upon request. The Fan/Motor assembly is elastically suspended inside the unit, either by RIS or Spring type vibration isolators, thus eliminating the need of external isolators.
Different fan positions are available depend on the requirements. The fan outlet is connected to the unit panel by means of plasticized fabric, to avoid any transmission of vibration to the panel.
The use of free flow fans (Plug Fans)in air handling units is a relatively recent development and offers the following major advantages:
- Energy saving, since the overall efficiency of the system is higher.
- Possibility to monitor the airflow with precision, in combination with frequency inverters and the central building management system.
Unobstructed and uniform internal unit flow, which lead to a better performance of inside components such as coil and filters. In addition, the absence of pulleys has a positive effect on flow uniformity. Klimallco possessing the necessary expertise and knowhow for this type of application, can offer complete built in control panel.
In all fan sections, in addition to the service door, Klimallco offers as standard a second safety door with net screen, to eliminate the use of a belt guard and avoid unauthorized people touching moving parts.
The fan motors are totally enclosed fan cooled TEFC type, foot mounted available with 2, 4, 6 and 8 poles. with protection IP55 and insulation class F, energy efficiency IE1 (EFF2) or IE2 (EFF1).
Three phase asynchronous available with frequency 50 and 60 Hz. Upon request the motors are available in single or double speed. All motors are supplied as standard with build in PTC safety device for thermal and overload protection. Upon request motors can be provided with variable frequency invertor. all motors are ICE, CEI and UNEL approved. All motors are selected with safety margin more than the fan shaft absorber power.
Upon request each fan motor can be supplied with variable frequency inverter for controlling the rotational speed of electrical motor by controlling the frequency of the electical power supplied power supplied to the motor. The variable frequency motors on fans save energy by allowing the volume of air moved to match the system demand.