Fan Velocity Controller

Fan pace controller or low ambient fan controller is a management that’s used to manage the fan pace of the air-cooled condenser in a warmth pump direct enlargement system. Warmth pump is utilized in temperate nations and can be utilized to function in cooling or heating mode. When used as a heating mode in winter, the indoor coil acts as a condenser and out of doors coil as evaporator.

When the unit is about to cooling mode in summer time, the indoor coil will function as an evaporator and the out of doors coil as condenser. That is achieved by means of a 4-way-valve that reverses the move of the refrigerant within the system. In america, normally when the reversing valve is ON, the system will function in cooling mode and when it’s OFF, in heating mode. 

Capabilities of a Fan Velocity Controller 

When the out of doors ambient temperature is low equivalent to 50°F(10°C) or beneath, we’ll normally wish to run our warmth pump in warmth mode to warmth up the room to keep up a cushty temperature for the human physique.

Nonetheless, there are cases wherein we wish to function the warmth pump in cool mode regardless that the out of doors surrounding temperature is low. These locations could embody the followings.

• Information facilities or server rooms the place all the knowledge expertise gear have to have a cool and steady temperature.

If we proceed to function the warmth pump in cooling mode, the pinnacle strain will drop. The enlargement valve wants a sure head strain to function correctly and if the pinnacle strain continues to drop, it’s going to trigger the air con system to cease working. Consequently, the evaporator will freeze-up and compressor slugging will occurred.

Compressor slugging is attributable to the entry of liquid refrigerant into the compressor’s cylinder throughout operation. It’ll harm the valves, bearings and different mechanical components of the compressor.

The answer to this downside is to put in a fan pace controller that may be capable of regulate the pace of the out of doors fan of the condenser. In an effort to use the controller, verify the specs of the fan to make sure that the fan is ready to be modulated by altering the provision voltage to it.

A sensor will probably be mounted on the liquid line of the condenser the place its temperature is used to manage the pace of the fan. By regulating the pace, the pinnacle strain won’t drop too low therefore the warmth pump will nonetheless be capable of function in cooling mode regardless that the out of doors ambient temperature is low.

Look and examine the options of a fan pace controller earlier than shopping for it.

• In cooling mode, the arduous begin characteristic will probably be obtainable wherein the output voltage to the fan will probably be at its most through the first few seconds to make sure correct rotation of the fan. After that, it is going to be regulated based mostly on the out of doors ambient temperature.

• In heating mode, there will probably be no regulation of the output voltage. It’ll function at its most line voltage.

• Adjustable rotation of the pace within the area based mostly on the condensing temperature.

• Score of output present. Some can go as much as 10A.

• Enter line voltage vary.

• An remoted enter(equivalent to 24VAC) to energy up the controller is a consideration for security necessities.