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1. VENTILATION PRODUCTS
35. DEMAND & CONTROL OF VENTILATION

 

SA/pl2011

1. Monitoring of Carbon Dioxide

The control of a ventilation system via CO2 is a good alternative when it is required to check the variable and economic operation of the fan and is met in applications where human presence is variable.  Fans work at low speed when the number of people present is low and the fan speed increases when the number of people increases respectively.

Examples of application:

  • Commercial spaces and shops with a large number of persons present
  • Meeting halls, theaters, cinemas, etc.
  • Gyms, educational centers, etc.

2. Checking RIP Movement

The control of a ventilation system via a motion sensor is an alternative proposal when the fan is required to change between the high and low speed and is recommended in applications where the amount of people in the area varies.  The fans continuously work at low speed and when the motion sensor is activated by the presence of people, the fan automatically works at high speed.

Application examples:

  • Restaurants
  • Commercial shops
  • Meeting halls, theaters, cinemas, etc.
  • Public bathrooms and changing rooms
  • Gyms, educational centers, fitness centers, etc.

3. Controlling Humidity

In certain applications the purpose of a ventilation system is to ensure that the humidity in a room will not reach a high level.  There are several methods available, and usually the control of the fan operation by a humidity sensor is often a good alternative to meet such a requirement.  The fans work at low speed when the humidity level is low and their speed increases when the humidity level is very high, thereby maintaining the low level and saving energy in the overall operation.

Application examples:

  • Locker rooms
  • Laundries and laundromats
  • Drycleaners
  • Fitness Centers, Spas, etc.
  • Libraries, cheese curing rooms, cellars, warehouses, etc.

4. Timing Control

In applications where it is known in advance the time the area will be used or the usual time that a greater congregation of people will be gathered at the area, the use of a timer for controlling the operation of the ventilation system is an excellent alternative.  The timer is set so that the fans work at high speed when the area is with many individuals and low when there are few or no people.

Application examples:

  • Large halls, restaurants and night clubs
  • Retail stores, offices
  • Theaters, cinemas
  • Meeting rooms, shows, schools, canteens, nurseries, etc.

5. Control of a Limited Duration

Controlling ventilation with a simple timer is the easiest and most economical way to meet a particular ventilation requirement, as well as saving energy.  Through a timer the control and changes of fan speeds are achieved manually.  The final user decides when the fans work at high or low speeds.

Application examples:

  • Meeting rooms, theaters, cinemas, etc.
  • Gyms, schools, etc.

6. Pressure Control

A ventilation system for residences is a requirement nowadays, although the proposed and more integrated solution that is gaining ground is using heat exchangers.  To avoid dirty air dispersing to other areas of the house during the operation of the ventilation and the fireplace due to vacuum from the ventilation, it is necessary to control the operation of the exhaust fan via a pressure sensor to retain the areas in overpressure.

Application examples:

  • Residential and areas with extractor hoods.
  • Conference rooms, and similar spaces of autonomy diffusers/baffles.
  • Residences, chalets, small restaurants, cafes and spaces with extractor hoods, and fireplaces in public spaces.

7. Temperature Control

Energy savings can be realized through temperature control of the fan operation in many applications, especially where there is heat due to the various machinery, equipment, and production processes.

Application examples:

  • Engine and boiler rooms, industrial premises
  • Computer rooms, transformer rooms, etc.

8. Connection with BMS (Building Management Systems)

More and more people are realizing the benefits of Central Building Control Systems (BMS).  Easy and accessible information increases the flexible function and lower operational costs and maintenance costs.  With the recommended provisions of control there are many possible connections with a BMS system.  In this manner we receive information, an alarm and the possibility to change fan speed via remote data communications.  The simplest method is to connect the fan speed switch and the fan protection, to a programmable digital controller with a communication card.

The alarm establishes a connection to the digital control input and from the digital output it changes the fans speed via contact.  Sensors with various signals associated with analog or digital input and the control and change of fan speed is achieved via software commands.

Electrical Connection:

Note that the three phase fans should be connected with motor protection STDT 16, except for transformer RTRDU, to give an alarm signal.

 

 
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