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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.
We provide cooling and heating solutions for BARS, PUBS, CLUBS & RESTAURANTS; SHOPS, OFFICES, WAREHOUSE & FACTORY UNITS; HOSPITALS & SURGERIES; MOBILE HOMES as well as HOUSES, BUNGALOWS AND CONSERVATORIES.
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 manufacturers 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 owners 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.
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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