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Air Conditioner Shack,
Unit 2, Torridge Close,
Telford Way Industrial Estate,
NN16 8PY

London office:
Unit 52 Newark Crescet, Park Royal Ind Est, London, NW10 7BA.
Tel: 01536 484 733

Evaporative cooler is a kind of cooling equipment that changes air into moist cool by way of smothering the air with water vapor. It does not cool air by using a refrigeration unit at all. This kind of equipment is mostly made use of in warm or dry weather regions. Portable air conditioning from AirConditionerShack.co.uk is your best choice when it comes to meeting your exact air conditioning requirements.

> Evaporative coolers are an energy saving way to combat heat. We know you have tried everything from fans to sitting in your garden fanning yourself with the newspaper. On those few really sweltering hot days in summer, what you need desperately is a portable air conditioning option from Icecape. They are energy efficient, ozone friendly as well as cost effective. Cool down your house this summer with Iceboys portable air conditioning and you will so glad you did! Evaporative coolers are energy saving and will not damage the ozone. Icecape concentrate on service, supply, support as well as installation. We have extremely trained professionals that will come and install our air conditioners professionally and correctly without disrupting your daily lives. We are also able to provide on site training on how to use your portable air conditioning units correctly. Choose Iceboys if you want quality.

> You might be asking yourself what the difference between an evaporative cooler and an air conditioner. Well evaporative coolers are quite different to air conditioners. Air conditioners produce quite a bit of noise, and are substantially difficult to repair as opposed to evaporative coolers for the average home owner or office inhabitant. In addition they also make use of quite a large amount of electricity and can harm the ozone as well. Evaporative coolers are not only relatively quiet, but they are simple and easy appliances, make use of far less electricity and cannot damage the ozone. Much easier for the average layman to use. An evaporative cooler essentially encompasses a large fan and water locked pads. Fresh air from the exterior of the property is cooled down by about twenty degrees as it is pulled through the water locked pads and then let into the house. The cooler slightly grows the amount of humidity of the air coming in. This is different to an air conditioner which lessen humidity as they re-use the air from the property.

> The water locked pads on an evaporative cooler are genuinely efficient air filters, holding particles on their wet surfaces. The constant wetting of the pads flushes the trapped particles into the sump, where they are then kept until cleaning.

> The low power needs enables you to simply plug in the evaporative cooler into a nearby standard plug point on most of the standard sized units. Normally no special wiring is required. A lot of air conditioners need their own high amp power circuit or some special wiring.

> You must supply a water connection to the evaporative cooler, some small coolers are filled by the owner, while for the bigger ones a ball valve Y hose connection on an exterior hose bib is sufficient. Water usage can be from three to fifteen gallons on a daily basis obviously dependant on your own usage.

> A small evaporative cooler can be temporarily positioned in a window at some points. Any evaporative cooler has to have easy access to exterior air. Bigger units normally need some ducting, the detail of which will rely on the position of the cooler itself. Like air conditioners, bigger units can be positioned in side a window mount, wall mount or roof mount and can be inter linked with the forced air duct system in the property. Coolers can also be placed inside the floor. Any ducting will require the capacity enough to handle the big amount of air delivered by the cooler. Remember that as the cooled air supplied by the evaporative cooler is warmer than the air supplied by an air conditioner, it will require more air flow to cool the home or office as well.

> It is vital to leave a minimum of window open when an evaporative cooler is working. You can steer the cooled air blown into the home or office to many rooms by opening the right windows. It might also be good to open an attic or basement hatch to enable the air to release into the attic or basement, but only if enough passive attic or basement venting it also available for this reason.

> As the same as any air conditioner, an evaporative cooler will require to be winterized or taken inside at the start of the cooler climate. Openings into the home or office will require to be sealed and insulated for the winter period.

> When it comes to their cooling capability - an evaporative cooler with the same cooling capability as a specified air conditioner will cost you half the price. Installation rates are about the same for both units. Operating costs will be about twenty five percent for an evaporative cooler when compared to an air conditioner.

> The cooling performance of a single stage evaporative cooler is decided upon firstly by the temperature and relative humidity of the air that's coming in.

> Evaporative coolers are energy efficient and they do not hamper or hinder the ozone either. The most cost effective in the long run as well which is fantastic if you are a bean counter. It is important that you choose the correct portable air conditioning unit suited to your air conditioning requirements and needs. Contact Iceboys - the professional air conditioning specialist for cost effective portable air conditioning solution as well as excellent service!

> The differences between evaporative coolers and air conditioners are simple. Evaporative coolers are cheaper, quieter, unharmful to the ozone and they use far less electricity.

Air Conditioning Systems Unrivalled standards of experience, professionalism and customer care have combined to establish Icecape Ltd t/a RAC Kettering as one of the UK's leading distributors of Daikin Air Conditioning Products and Systems. RAC Kettering has chosen Daikin in 1977 as its first UK supplier and has since grown steadily to become a major UK Distributor of Air Conditioning Equipment with special expertise in VRV and Chiller Systems. In addition to just supplying Daikin Air Conditioning Products, we also operate a highly professional distribution service and demonstrate our ommitment to fully back-up our clients by maintaining a well-stocked spare parts department. Similarly high standards apply to the full pre and after sales support services provided by RAC Kettering. Clients throughout the UK depend on the expertise of RAC Kettering whose Sales Engineers operate nation-wide to give a comprehensive design and support service. This is reinforced with a programme of specialised product training for client's design and engineering personnel. An experienced Technical Department assists with any engineering issue and can provide on-site commissioning and troubleshooting.

What is air conditioning? Throughout the ages, we have sought to improve the level of comfort offered by our surroundings. In colder regions, we have tried to heat our dwellings and in warmer climes, to cool them down because if we are not comfortable, we can neither work nor relax. But thermal comfort vital to our well being, is subject to three basic influences:

Among these influences, the human factor is somewhat unpredictable. The others can be controlled in order to provide that much sought after feeling of well being. Changing patterns in construction, working practises and internal occupancy levels have created new parameters within which designers must operate. Modern buildings for instance, generate far more heat than their predecessors of say, 50 years ago and there are several reasons for this:

Solar Infiltration Developments in building technology have also given rise to an increased use of glass - even when solar protective glazing is fitted, solar gains can be considerable.
Occupants Increasing numbers of occupants, each generating some 120W/h of heat, are routinely crammed into office areas.
Electrical Appliances Computers, printers and photo copiers, all part of the modern offices scenario, also generate substantial heat loads.
Ventilation Introducing the outside air into a building also introduces its temperature something of a problem if it's 30ºC outside!
All these heat gains must be removed if a comfortable living or working environment is to be attained and the only genuinely effective way of achieving this is via air conditioning. The principles of air conditioning are based around the transportation of heat from one place to another and the medium generally used to effect transportation is refrigerant.

The principles of air conditioning are based around the transportation of heat from one place to another and the medium generally used to effect transportation is refrigerant. Refrigerant is used because it evaporates at very low temperature. Physics shows that the evaporation of a substance (change of phase) requires considerable energy.
The low boiling point inherent in refrigerant enables it to be used at relatively low temperature, such as room temperature. When a liquid refrigerant evaporates it absorbs heat from its surroundings which therefore, cool down. Evaporation causes the refrigerant to change from liquid to gas (phase change), at which point it contains considerably more energy (heat) than in its liquid state the maximum amount possible, in fact. If the refrigerant is to be reused, this heat must be released, preferably at a point where it is no longer required. Once again, physics shows that when a substance condenses, it releases much of the energy it carries thus the refrigerant must be condensed. This requires its pressure to be increased in order to raise the condensation temperature above that of the heat exhaust point. This operation is carried out by a compressor. Once returned to its fluid state, the refrigerant can absorb heat again. But its pressure is now too high, as is its condensation point and also its evaporation temperature. The problem is overcome by use of an expansion valve which allows the pressure to fall, thereby reducing the evaporation temperature to its original level. At this point the cycle can recommence. Manipulation of the refrigerant pressure enables heat to be absorbed from an area of lower temperature and released to an area of higher temperature with the corresponding result of cooling or heating.

Air conditioners are part of our lives and we enjoy their comfort everywhere. In shops, restaurants, offices, hotels ¦it's hard to imagine life without them. Air conditioning provides you with pure cool air when it's hot outside. But what about winter, and those cooler periods during spring and autumn? This is when we need heating. Not cooling. ...heating in the winter  The ideal solution to this problem is the Heat pump. It cools when it's hot, and warms when it's cold. The choice is yours, at the push of a button. Comfort and well being all year round. A simple principle developed to perfection Air conditioning works like your refrigerator, which removes heat continuously from the cabinet and discharges it into the kitchen. You can feel this 'free' heat by touching the coil on the back of your refrigerator. In summer, the heat pump extracts heat from the warm air in your home and pumps it outside. Your home stays comfortable and cool. In winter, it's the reverse. Natural heat in the outdoor air - even when it's freezing - is extracted and moved indoors. Wonderful warmth when you need it. Comfort that costs less Three kilowatts of heat for each kilowatt of electricity used. Heat pumps are up to three times more economical than conventional gas fired or electric heating systems. Installation costs are lower too. With just one system for cooling in summer and heating in winter, you save on equipment outlay.

If we look for AIR CONDITIONING in Collins English Dictionary it states:

"A system or process for Controlling the Temperature and sometimes the Humidity and Purity of the air"

Controlling the Temperature is being able to Heat and Cool. Not only cool. The air that we breathe is made up of 3 major components all capable of carrying energy (heat):

1) The component molecular constituents of air: Oxygen (23%), Nitrogen (76%), Carbon Dioxide (< 1%) and Inert Gases (< 1%).

2) Moisture or Water Vapour: Water vapour is present in the air at all times, the quantity present being dependent upon the air temperature. The higher the air temperature the higher the water vapour (quantity).

3) Airborne Particulate: These are the suspended impurities within the air from either industrial or natural pollution such as Pollen, Dust, Smoke, Germs… etc.

As air is the only media that encompasses the whole of our body, we need to condition this air to provide comfort.

The action we need to take is:

1) Control Temperature (Heating & cooling) which entails adding energy (heating) or removing unwanted energy (cooling). General comfort conditions range between 20 - 25 °C in the UK.

2) Control Humidity (moisture content in the air), either Humidify (add moisture) when dry, which can result in dryness of skin, dry throat and encourages static built-up) or de-humidify (remove moisture) when the amount of moisture in the air is high, which can result in breathing discomfort. Comfort humidity is generally between 30-70 % RH (Relative Humidity) for the UK.

3) Provide Ventilation to provide the necessary Oxygen for breathing and dispelling carbon dioxide, Odour,dust, smoke etc. General Ventilation requirement ranges between 5 - 18 litres per second per person.

4) Provide Filtration to clean outside and inside air by removing dust, pollen, etc. Dust in dry air combined with dryness (lack of moisture in the air) is the main cause of static shocks. Lack of ventilation and filtration combined with the lack of maintenance is the main causes of Sick Building Syndrome (SBS). Therefore air conditioning encompasses HEATING, COOLING, HUMIDITY CONTROL, VENTILATION, FILTRATION.

There are many different methods of achieving comfort conditions (Heating, Cooling, Humidity Control, Ventilation & Filtration).

1) Heating and Cooling (which should be treated as one entity) are the most important parts of the Air conditioning system. Heating (adding energy): Is achieved through electrical energy input, Natural Gas Boilers, Oil Boilers and Reverse Cycle Refrigerant Heat Pump. Transfer of this energy from source to the air-conditioned space can be via air circulation (Air systems), via water circulation (Water systems) or via refrigerant (Extended Direct Expansion systems). Cooling (absorbing/removing heat): This is the reverse of heating i.e. transferring unwanted energy/heat (generated by lights, computers, people, solar heat gains through glass, structure heat gains, ventilation heat gains, etc.) from inside to outside. The transfer method is via the same media as heating transfer: Air systems, Water systems or Extended Direct expansion systems. Statement: 95% of cooling systems (air, water or Extended Direct Expansion (EDX)) use Refrigerant (vapour compression cycle or VCC) in the heat rejection process, as Refrigerant is the most efficient media and has the advantage of having a boiling temperature of -40°C (water =+100°C) and an energy carrying capacity 10 times more efficient than water and 50 times more efficient than air.

2) Ventilation which can be: A part of the whole air conditioning system, (in the case of Air Systems) where Air is also used to transfer energy.  Or an independent system mainly to provide ventilation (in the case of Water Systems and EDX). However, outside air needs to be treated (heated and/or cooled and filtered) to meet indoor temperature conditions, especially in extreme winter conditions and not so extreme summer conditions. Statement: Utilising ventilation in mid season to control temperature can also provide an acceptable energy efficient solution. This is more the case in outer city areas and areas of low level, internal energy gain. Ventilation can represent a high percentage of building energy consumption, especially in centralised systems. Modular systems are more controllable, run only where needed and easily added to when requirements change.

3) Filtration is an integral part of any air movement device; the level of it depends on the type of equipment selected to provide the other parts of the air conditioning system. It can also be added to an existing system or stand-alone (e.g. electrostatic) Dependent on the application (Public Houses, etc) and special requirements (Hospitals, etc). Statement: There may be applications where due to capital cost implication, excessive ventilation (oversized) is applied to overcome the above special requirements at the expense of running cost. Localised filtration is more possible these days at low cost rather than over sizing the ventilation system

Air conditioning is to control the temperature in the main, control the humidity and clean the atmosphere that we live in. To control the temperature we have to add heat (energy) when cold and remove heat (energy) when warm. This energy has to be transported from outside to inside (Heating) and from inside to outside (Cooling). There are three main methods to transfer this energy: Air Systems, Water Systems and Refrigerant Systems. Air Systems: This where we use the air to carry the energy from inside to outside and vice versa. The use of Air Handling Units (AHU) or Roof Top Packages (RTP) to condition the air (Temperature, humidity sometimes), filter and refresh the air and send it through ductwork to the occupied space where the conditioned air will heat or cool the space as required and return via return air ducts back to the AHU or RTP. Air Handling Units contain a cooling coil (connected to a chiller or condensing unit) a heating coil (connected to boilers or electric heaters) filters and circulating fan(s). Roof Top Packages contain refrigerant cooling cycle, heating coils (connected to boilers or electric heaters), filters and circulating fan(s).

Water Systems: In these systems water is used to carry the energy from inside to outside and vice versa. The use of a chiller (on roofs or plant rooms) to cool the water which would be circulated via circulating pumps to the occupied space where it will be passed through fan coils (terminal units) which circulate room air over the coil, hence absorbing unwanted heat. The use of boilers (in plant rooms) to heat the water (separate circuit from cooling) which would be circulated via circulating pumps to and back from the occupied space where it will be passed through the same fan coil which circulate room air hence adding heat to the space. Water Systems only control the temperature. Filtering of the air is normally carried out through the indoor fan coils (terminal units). Ventilation is normally carried out through a separate system with a range of AHU and ductwork distribution system (smaller than air systems) which can be localised to the air-conditioned space.

Refrigerant Systems (Known as Extended Direct Expansion or DX Systems): In these systems refrigerant is used to carry the energy from inside to outside or vice versa. The use of outdoor condensing units (can be reverse cycle heat pump for heating) cool the refrigerant and sends it through refrigeration small bore pipe work to indoor fan coils (terminal units) where it will expand to lower the temperature of the refrigerant in the pipe, hence room air when circulated over the coil will lose its unwanted heat. Heating is achieved via the same outdoor unit by reversing the cycle or utilising a third pipe to carry hot refrigerant to the indoor unit to provide heating. Filtering of the air is normally carried out through the indoor fan coils (terminal units). Ventilation is normally carried out through a separate system with a range of AHU and ductwork distribution system (smaller than air systems) which can be localised to the air-conditioned space.

The basis of most (more than 95%) air conditioning systems is the ' vapour compression cycle". The media (vapour) is Refrigerant (hydrochlorofluorocarbons - HCFC or hydrofluorocarbons - HFC) which is non-toxic, non-explosive and non-corrosive. These Refrigerants have a boiling point of aprox. Minus 40°C which means that even if the air (outside or inside) temperature is as low as minus 39°C it still has heat to be absorbed by refrigerants.

The vapour compression cycle requires four components:

1) The compressor: To raise the pressure of low-pressure low temperature gas to high-pressure high temperature gas. There are many types of compressors; the most common are Reciprocating, Rotary, Scroll, Screw and Centrifugal.

2) The Condenser: To change the state of high-pressure, high temperature gas to high-pressure, high temperature LIQUID. This is achieved by passing ambient air (known as air-cooled) or water (known as water-cooled) over the condenser tubes.

3) The Expansion Device: The purpose of the device is to change the state of the refrigerant from high-pressure, high temperature liquid to low pressure low temperature saturated liquid. This is achieved by passing the liquid through an orifice.

4) The Evaporator: To absorb the heat from room air or water, which in the case of a chiller is circulated around the evaporator coil. This will change the state of low-pressure, low temperature saturated liquid to low pressure, low/medium temperature gas. These components are common to the vast majority of domestic refrigerators and appear in slightly different forms in 95% of air conditioning and refrigeration systems, Domestic, commercial or industrial. This vapour compression cycle if reversed (condenser becomes evaporator and visa versa) can now absorb heat from outside and transfer it to inside, hence saving energy. This is called Reverse Cycle Heat Pump. Energy savings can be as high as 4 to 1 (for every kW input we get 4 kW output).

For a cheap home air conditioner in the UK visit our portable air conditioner home page .


  Q.  how do I choose the system for my requirements?

  A.  Don’t worry RAC can do all that for you with a no hassle site survey we can tall you exactly what you need.

Q.  how easy are the systems to keep clean

A.  They are very easy to keep clean with easy access filters and wipeable fascias. 

Q.  Do you supply portable air conditioning units

      A.   Yes, RAC can supply a wide range of portable A/C units for sale or hire.

Q.  Do you do air conditioning for cars?

   A.  We do not undergo work on cars, but can recommend various companies that do.

Q.   Do we need to have extensive building work to accommodate a system?

   A.    No, due to the large choice available we can recommend the right one to fit your situation and so limit disruption to your existing surroundings, any necessary pipe work or electrical cables can be kept to a minimum.


Air conditioning includes both the cooling and heating of air. It also cleans the air and controls the moisture level. An air conditioner is able to cool a building because it removes heat from the indoor air and transfers it outdoors. A chemical refrigerant in the system absorbs the unwanted heat and pumps it through a system of piping to the outside coil. The fan, located in the outside unit, blows outside air over the hot coil, transferring heat from the refrigerant to the outdoor air. Basic Operations. Most air conditioning systems have five mechanical components: a compressor :an expansion valve or metering device:an evaporator coil and blower:a chemical refrigerant.

Most central air conditioning units operate by means of a split system. That is, they consist of a "hot" side, or the condensing unit—including the condensing coil, the compressor and the fan—which is situated outside your home, and a "cold" side that is located inside your home. The cold side consists of an expansion valve and a cold coil, and it is usually part of your furnace or some type of air handler. The furnace blows air through an evaporator coil, which cools the air. Then this cool air is routed throughout your home by means of a series of air ducts. A window unit operates on the same principal, the only difference being that both the hot side and the cold side are located within the same housing unit.

The compressor (which is controlled by the thermostat) is the "heart" of the system. The compressor acts as the pump, causing the refrigerant to flow through the system. Its job is to draw in a low-pressure, low-temperature, refrigerant in a gaseous state and by compressing this gas, raise the pressure and temperature of the refrigerant. This high-pressure, high-temperature gas then flows to the condenser coil.

The condenser coil is a series of piping with a fan that draws outside air across the coil. As the refrigerant passes through the condenser coil and the cooler outside air passes across the coil, the air absorbs heat from the refrigerant which causes the refrigerant to condense from a gas to a liquid state. The high-pressure, high-temperature liquid then reaches the expansion valve. The expansion valve is the "brain" of the system. By sensing the temperature of the evaporator, or cooling coil, it allows liquid to pass through a very small orifice, which causes the refrigerant to expand to a low-pressure, low-temperature gas. This "cold" refrigerant flows to the evaporator.

The evaporator coil is a series of piping connected to a furnace or air handler that blows indoor air across it, causing the coil to absorb heat from the air. The cooled air is then delivered to the house through ducting. The refrigerant then flows back to the compressor where the cycle starts over again.

Perfect comfort all year round - How air-conditioning works Air-conditioning is an ingenious way of controlling not only the temperature but also the movement and cleanliness of air inside the building. Although the process is relatively complex, the operation itself is quite simple. In most systems each indoor unit is connected by inconspicuous pipe work to an outdoor unit attached to a wall, rooftop or balcony, or located in a plant room.

Not just cooling but heating - Lower heating bills
Air-conditioning was originally considered a cooling system. Then with the introduction of the split heat pump, air-conditioning was able to provide hot air for winter as well as cool air in the summer, ensuring optimum conditions all year round.

Good for business - Better productivity Only a few years ago air-conditioning was considered as a luxury in the UK. Today many businesses regard it a necessity. In air-conditioned offices, staff work more productively and managers make better decisions.

For a list of the main our portable air conditioner home page sites in England, Scotland, and Wales to see which ones offer a cheap price.

Welcome to Icecape Limited t/a RAC  Kettering A leading and progressive supplier and installer of air conditioning systems at the most competitive prices available. RAC is at the forefront of supplying, installing and maintaining a range of state-of-the-art, high quality and reliable air conditioning systems into the commercial, industrial and domestic sectors.


Please browse through our website so that you can fully appreciate the benefits that RAC Kettering can bring to you from a wide selection of advanced technology air conditioning systems to suit your needs and requirements.

Air Conditioning is a process of what we call Heat Transfer. Regardless of the outdoor conditions we are able to draw on the natural hot or cold molecules in the atmosphere and use them to heat or cool an indoor air space.
An Air conditioner removes cold molecules from the air outside passes them through pipe work into your house, office or conservatory and then releases them. At the same time it removes the heat from indoors and releases it to the atmosphere outside. By reversing this process we can also heat a house, office or conservatory.

All models, excluding Portables, come with an Inside Unit and an Outside Unit, providing high-efficiency rotary compressors that guarantee refrigerant compression with minimal loss, or a heating efficiency of nearly 300% for each 1kW input giving up to 2.85kW output. So what does all that mean - simply put, it means that the cost control over your interior climatic environment is significantly enhanced in your favour.

Too often, precision air conditioning is only considered when humidity control is required. If the application does not demand humidity control, comfort cooling is installed. In fact, the combination of recent economic conditions and an increasingly competitive market have led to a rise in the number of server rooms and data closets being served by traditional comfort cooling. These applications can be air-cooled with a traditional, residential-style split system, or utilize a cooling only water-source heat pump or a chilled water fan coil unit. These systems appear attractive to the installer because of their apparent low up-front costs. However, with some analysis, the cost differences between precision and comfort cooling systems are not what they first appear. General Applications ConsiderationsSensible Cooling CapacityThe first thing to consider when comparing costs of cooling units is the amount of sensible cooling available. Since almost all of the loads in these rooms are sensible heat, units should be selected on their sen-sible capacities. The higher latent capacity of comfort units actually hurts their perfor-mance in this application by unnecessarily lowering the humidity in the room. In addition, comfort cooling units are usu-ally rated at the ARI standard of 80 degrees F entering air temperature — not nearly cool enough for computers and servers. One comfort manufacturer’s two-ton unit actually de-rates to one ton of sensible cooling when adjusted for a 72 degrees F entering air temperature. Be sure to compare the cost of units with the same sensible capacity at the same entering conditions and not just “two-ton versus two-ton.” A lower tonnage precision air conditioning system will probably match the higher tonnage comfort unit for most applications.AccessSmall precision ceiling units, which are designed for one-side only service access and filter replacement, utilize tight room space more efficiently. Several comfort cooling units require multi-side access, which restricts where they can be installed and can increase ducting requirements and cost. One comfort unit actually requires bottom access, making installation of the code-mandated auxiliary drain pan virtually impossible.Condensate Pump Power, Drains and Alarms Because of limited above-ceiling space, many small units require condensate pumps. condensate pumps get their power from the unit and do not require an additional power feed. Most comfort units require an additional electrical feed (usually at a different voltage) for the pump, increas-ing overall installed cost. Also, if a condensate pump detects an overflow, it shuts off the unit and sends an alarm to the wall-mounted controller. The comfort cooling pump sends its alarm by overflowing water onto the floor. Be sure to compare the cost of units at the same sensible capacity at the same entering conditions . . .

(If the pump is installed in the auxiliary pan with an overflow switch, it will shut the unit down; however, the owner will not know the unit is off until the room gets hot.) Finally, since units are internally trapped, the required number of field solder joints is reduced, further saving cost. Some comfort units actually have more than one required drain connection, adding addi-tional labor cost.Remote shutdown Many small server rooms have either an FM200 fire suppression system or an Emer-gency Power Off (EPO) system. Both of these require the air conditioning unit to be shut down immediately upon alarm. Units come standard with remote shutdown contacts. Comfort units must be specially wired to accomplish this task, increasing the owner’s cost.MonitoringUsually, smaller rooms are not continuously occupied. Notification of a problem with the unit is very important. Units come standard with a common alarm con-tact which can be connected to a variety of alarm or management systems. Since this contact picks up all alarms within the unit, not just temperature, potential problems (such as a dirty filter or clogged condensate line) can be found and fixed prior to the room getting out of control. Continuous Operation and Filtration evaporator fan motors are designed to run continuously to help eliminate hot spots in rooms and provide for increased filtration. Ducted units have 4-inch pleated filters as standard. Even though their fans can be put in the “on” position, comfort cooling units are designed for intermittent operation and typically do not have the required motors for continuous duty. Typi-cal comfort cooling filters are 1-inch throw-away, which can catch large contaminants, but are not very effective in controlling dust.Air-Cooled Application ConsiderationsLow ambient controls. Small systems come standard with low ambient controls to -20 degrees F. This is important since the room will likely require air conditioning regardless of out-door conditions. Low ambient controls must be added to comfort cooling systems at an increased cost and generally are rated only down to 0 degrees F or 20 degrees F. Often this option requires field installation, raising costs even further.Voltage RangeSince many air-cooled comfort units are actually residential units, they are designed around a nominal input voltage of 240 Volts. However, in a commercial building, this voltage usually comes from a three-phase panel, making the actual input volt-age nominally 208V. This voltage is very close to being out of range for some of these units. Comfort cooling units are designed for intermittent operation and typically do not have the required motors for continuous duty.

Page 4
4One manufacturer lists their minimum volt-age as 207 volts. ’s small systems are rated at 208/230 to cover the entire range of possible commercial voltages. Water Cooled Application Considerations. units come standard with a variety of water-regulating valves pre-installed at the factory. Specifically, two or three-way valves are available in standard and high pressure ratings to suit numerous applica-tions. Comfort cooling units require the purchase and installation of an external valve, adding material and labor cost.Compressorized Application ConsiderationsHot gas bypassBecause of load uncertainty or future growth, hot gas bypass is a frequent addition to a small unit. It is standard on every compressorized Mini-Mate2. Providing hot gas bypass extends the compressor life by reducing the number of compressor cycles if the load of the room does not match the unit capacity. This is often the case when simple room load esti-mates have been made (or when room equipment loads are not operating at full capacity). Another benefit is enhanced humidity con-trol. As offered with some microprocessor controls, hot gas bypass reduces the latent (or dehumidification) capacity of the Mini-Mate2 coil, thus allowing more of the water vapor to stay in the space. Hot gas bypass warms the evaporator coil and is an effective means to dry the coil. Yet, during a call for dehumidification, some controls will disable the hot gas bypass mode, thus providing maximum latent removal.Chilled Water Application ConsiderationsControl Valves and Controlssome units come standard with a variety of control valves, including high pressure, pre-installed at the factory. Comfort cool-ing units do not. Also, since the thermostat and control valve must be purchased sepa-rately, these items must be designed and integrated in the field, likely adding relays and wiring. This not only adds field cost, but increases project management time as sep-arate orders must be placed and shipments tracked.Starters and Motor Mountingsome units do not require external start-ers. Most chilled water units require exter-nal starters, adding material and labor cost. Also, many chilled water units have the motor “shipped loose” which adds field labor time.ConclusionPrecision air conditioning systems are designed specifically to cool electronic equipment. Their high sensible heat ratio and continuous-duty design makes them ideal for small computer rooms and closets. They also include a number of features that simplify and reduce installation cost. Consequently, precision cooling units are almost always a more effective and cost efficient choice.Precision air condition-ing systems, such as the Mini-Mate2, are designed specifically to cool electronic equip-ment. Their high sen-sible heat ratio and continuous-duty design makes them the best choice for small com-puter rooms and closets.

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