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FAQS

Which brand of air conditioning equipment do you use?

BCO?(with compressor Toshiba).

I've heard many stories about Legionnaires disease being spread by air conditioning, is this true?
Legionnaires disease is caused by legionella bacterium. The bacteria can be found in any type of water system, but are most prevalent in warm (25-40c) un-treated water.?

It is usually spread when water droplets containing the bacteria are dispersed into the air, as happens with cooling towers; shower heads, spa baths etc.

It is not associated with most modern forms of air conditioners as there is no warm stagnant water involved.


How often does my air conditioner need maintenance?


This depends on the amount of use it gets. For instance, a system in a busy restaurant would probably need more maintenance than a unit in a dentists surgery room where there is minimal levels of dust.
We would recommend as a minimum of one major visit a year, if the system is in a busy restaurant or club more frequent minor visits in the interim.

How does air conditioning work?


The modern system of air conditioning/refrigeration is based upon the Rankine cycle. This relies on a specific temperature/pressure relationship of refrigerant in certain states and the high amount of latent heat needed to change the state of the refrigerant.

In the refrigeration system the gas is compressed which raises its temperature. The gas is then condensed, in the process removing the latent heat. The liquid then passes though an expansion device, which lowers the pressure and therefore temperature. The liquid evaporates, taking in latent heat. The gas is then compressed and the cycle starts again. The basic cycle was described by Carnot as early as the 1820s, but was refined by Rankine (1820-1870).

Theoretically most air conditioners should be referred to as comfort cooling as the air is only cooled or heated, with no humidity control or extensive filtration of the air.


What is dehumidification?


Air conditioning equipment usually reduces the humidity of the air processed by the system. Since humans perspire to provide natural cooling by the evaporation of perspiration from the skin, drier air improves the comfort provided. The comfort air conditioner is designed to create a 40% to 60% relative humidity in the occupied space.


What does an air conditioning check-up consist of?


It consists of the following steps:
• Check for proper refrigerant (freon) levels. Low level indicates a leak. If found, repair it before adding in more freon.?
• Check all electrical components and controls.?
• Clean evaporator and condenser coils, as needed.?
• Oil the motors as needed.?
• Calibrate thermostat.?
• Check condenser.?
• Check filters.


Is your air conditioner ready for hot weather?


Here are seven tips to prepare your air conditioner for summer. Remember, all central air conditioners should be periodically checked by an air conditioning professional.
1. Before turning on your central air conditioner, make sure the condensing unit, located outside, is not covered up. The process of pulling air into the system is hindered if the condenser cannot pull in enough outside air. Some people intentionally cover their condenser to protect it from the elements during the winter. The unit does not require any protection.

2. Run your air conditioner for a few minutes before the weather gets hot. If you wait until the first hot day to discover your system isn't working, you'll find yourself on a waiting list, sweating for days before an air conditioning specialist can come to fix it.

3. Change filters regularly. Dirty filters restrict airflow and reduce efficiency and can cause the evaporator to ice up. Disposable fiberglass filters should be replaced. Electrostatic or electronic filters should be washed regularly.

4. Make sure all access panels are secure, with all the screws in place.

5. Clean obvious obstructions such as newspaper and leaves from around the exterior of the unit.

6. Make sure the thermostat is set in its cooling mode. Just setting the dial below room temperature will not activate the air conditioner if it is set on heat mode.

7. A thoroughly cleaned air conditioning unit will operate at top efficiency. But don't use a hose and water to try to clean it. If you do, you risk serious electrical shock and shorting out the unit's electrical components.


What is BTU, W and SEER?


• A British thermal unit (Btu) is a standard measure of heat energy. One Btu is the amount of heat energy required to raise the temperature of a pound of water by one degree Fahrenheit. Its metric thermal equivalent is 252 calories per hour. As a unit of power, one Btu/h equals 0.2929 watts (W). Manufacturers classify the size, or capacity, of an air-conditioning unit in terms of Btu/h.

• Cooling capacity, measured in British thermal units per hour (Btu/h), indicates the quantity of heat a room air conditioner can remove in one hour.

• Cooling load, also expressed in Btu/h, refers to the maximum amount of heat that can build up in a space without a cooling system.

• A watt (W) is the standard unit of power; one kilowatt (kW) equals 1000 watts. You purchase electricity from your utility by the kilowatt per hour (kWh), equivalent to the amount of power required to operate one 100-W light bulb for 10 hours. To estimate how much electricity an appliance uses, multiply the wattage of the machine by the number of hours it will run.

• Seasonal Energy efficiency ratio (SEER) is a comparative measure of how much cooling an air conditioner provides for each unit of electrical energy that it consumed under standard operating conditions. A unit's SEER is calculated by dividing its cooling capacity by its electrical power input at a specific temperature. In most cases the higher the SEER, the more efficient the unit.


What is a heat pump?


A heat pump is a machine, which moves heat from a low level of temperature to a higher level of temperature. Heat pumps are realized through several physical effects, but they are classified depending on their applications (driving energy, source and sink of heat, or a heat pump which is basically a refrigeration machine). Refrigerators, air conditioners and heating systems are all common applications of heat pumps.

When comparing the performance of heat pumps, it is best to avoid the word "efficiency", as it has many different meanings. The term coefficient of performance or COP is used to describe the ratio of heat output to electrical power consumption. A typical heat pump has a COP of about three, whereas a typical electric heater has a COP of one. The COP of the heat pump is restricted by the second law of thermodynamics.
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Email: bco@bcocanada.com
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