Difference Between AHU and FCU

In simple terms, an air handling unit (AHU) is a component of an HVAC system that cools and distributes air into the space through a duct. A fan coil unit (FCU) is a standalone system that circulates the existing air in a small space, but it can also be a part of an HVAC system.

What is FCU in HVAC?

A fan coil unit (FCU) is a device that uses a coil and a fan to heat or cool a room without connecting to ductwork. Indoor air moves over the coil, which heats or cools the air before pushing it back out into the room.

What is the purpose of FCU?

Fan coil units circulate hot or cold water through a coil in order to condition a space. The unit gets its hot or cold water from a central plant, or mechanical room containing equipment for removing heat from the central building's closed-loop.

How does a FCU work?

A fan coil unit (FCU) contains a fan which draws the air in a space into the unit then blows it over a cooling or heating coil. Each FCU is provided with a small supply of outside air to ensure adequate ventilation. ...

What is the difference between Ahu and RTU?

There are no differences between an AHU and an RTU except for the fact that an RTU is placed on the rooftop. ... The AHU consists of components such as heating elements, cooling elements, blower or fan, filters, mixing chambers, vibration isolators, humidifiers, heat recovery devices and controls.

What is AHU and FCU?

By Joe Hullebusch Blog March 5, 2019. In simple terms, an air handling unit (AHU) is a component of an HVAC system that cools and distributes air into the space through a duct. A fan coil unit (FCU) is a standalone system that circulates the existing air in a small space, but it can also be a part of an HVAC system.

What is VRF system?

Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. Like ductless minisplits, VRFs use refrigerant as the cooling and heating medium.

What does Ahu stand for?

An Air Handling Unit (AHU) is used to re-condition and circulate air as part of a heating, ventilating and air-conditioning system. The basic function of the AHU is to take in outside air, re-condition it and supply it as fresh air to a building.

What is reheat in HVAC?

Reheat is the addition of heat to previously cooled air. Reheat is used sometimes for humidity control, and sometimes for occupant comfort. ... Then the reheat coil activates and the incoming cool air is reheated to maintain the setpoint.

Why does Ahu trip?

Re: AHU tripping on the control panel

Overload devices goes weak with time, causing them to trip at lower currents than they are adjusted to and marked for. Electrical cables and terminations looses continuity with old age. Electrical motors get worn with age and change their characteristics.

What is an FCU connection?

A fused connection unit (or FCU) is an electrical outlet with an integrated fuse used for connecting permanently installed appliances such as fridges, dishwashers, and waste disposal units to a circuit. ... Fused connection units can come in switched or unswitched varieties, and some also come with an indicator light.

How much is a fan coil unit?

Fan coil units range from $300 to $3,500, depending on the size and type. The term is often used interchangeably with air handlers, but fan coil units are not always the same thing. The least-expensive models run $300 to $800.

What is a 4 pipe HVAC system?

The 4 pipe system consists of two separate cooling and heating water coils. Each coil has its own dedicated set of pipes (supply and return) and valve. This type of fan coil can cool and heat at the same time and is not dependant of the actual mode of the building.

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