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HVAC Heating Systems

HVAC Heating Systems

HVAC in MOAmerican Services HVAC maintenance and repair service in Missouri knows that an HVAC Draft Inducer is a fan that pulls air through a heat exchanger and sends it to the outside through a venting system. In HVAC heating systems draft inducers are made of either metal or plastic depending on the Annual Fuel Utilization Efficiency (AFUE). The AFUE is the most widely used measure of a boiler or furnace’s heating efficiency. It measures the amount of heat actually delivered to your operation compared to the amount of fuel that is required to be supplied to the heating unit. HVAC heating units which have an AFUE rating of 80-90% will typically have a Draft Inducer made out of metal and heating units with an AFUE rating of over 90% will typically have a Draft Inducer made out of plastic.

The inducer creates a draft through the heating unit by way of a motor that is powered from the control board. During a normal call for heat, the control board will supply power to the inducer. It is connected to a pressure switch by a rubber hose. As the inducer starts, the pressure switch is closed by the suction of the fan

There are several key failures with Draft Inducers that can occur.   If the motor starts when required but the heating unit does not continue with the ignition sequence, most often it problem is a blocked vent pipe or condensate in the inducer assembly. Condensate can also back up into the inducer assembly on systems with AFUE of 90% or higher when the condensate trap becomes clogged. Another common problem is a hot running motor. This most often requires motor replacement.

Commercial Toasters for your Restaurant

Commercial Toasters for your Restaurant

commercial restaurant equipment in MOAmerican Services restaurant equipment repair and maintenance in St. Louis knows that some of the smaller pieces of restaurant equipment can prove to increase your productivity the most. In many restaurants that serve breakfast, a commercial toaster is essential for ensuring your customers have a good start to their day by getting the food served just the way they like it. Commercial toasters come in all shapes, sizes, and applications.

The most common commercial toaster seen in a restaurant is the conveyor type. This type feeds bread through a heating element in a continuous loop. Manufacturers rate these toasters by slices per hour. When selecting a conveyor type toaster, think about your operation and how many slices you serve at any given time. It is not uncommon for operations to utilize machines that will handle 800 slices per hour. The other idea to consider is that you may not require 800 slices per hour but your order turn-around time may be essential. A toaster that will handle 800 slices per hour, in general, will toast twice as fast as a unit that only handles 400 slices per hour. The unit cost savings between the two could be $400, however you must consider the time it takes to toast the bread compared to the efficiency of your servers, and the patience of your customers.

Most commercial toasters will run on 240 volts but they have also been known to run on standard 120 volts. A good quality machine will easily weigh 50 to 100 pounds and require a footprint of 16 inches by 20 inches. Ensure your location can handle both the electrical and space requirements before buying.

To schedule an estimate on your restaurant equipment repair or maintenance, contact us today at American Services.

HVAC System Efficiency in Commercial Buildings

HVAC System Efficiency in Commercial Buildings

heating service in MOAmerican Services HVAC heating and cooling repair in St. Louis knows that energy use for heating and air conditioning accounts for more than 25% of the primary energy consumed in commercial buildings in the United States.

Of the 59 billion square feet of total commercial floor space, about 82% is heated and 61% is cooled. Over the last 35 years, HVAC energy consumption has been a target for potential savings. Over the years, new technologies and a dedication to energy efficiency has allowed for a substantial decrease in energy consumption of commercial buildings. For example, a centrifugal chiller has increased 34% in efficiency over the last 20 years.

It is not just building operators that have been a key player in these energy consumption statistics. The general market, manufacturers, contractors, engineers, utility companies, and government organizations have all contributed to this positive growth. However, although there have been great strides in energy consumption reduction, there is still significant opportunity to reduce energy consumption further.

No matter what level of involvement you have with HVAC, whether direct or indirect, having a basic knowledge of system operation and new technologies can lead to tremendous energy savings. In any business, having a more efficient system calculates to substantial cost savings. A good first step is to contact a local HVAC specialist and schedule an facility audit. The specialist will methodically analyze and assess your operation so that he or she can make recommendations as to the best possible solutions for your application. Typically, these specialists will work with building engineers and manufacturing facilities to ensure that the recommendations are in line with the processes of the various systems in your operation.

For a quote on HVAC services contact American Services today.

Commercial HVAC Air Systems

Commercial HVAC Air Systems

hvac technician in MOEnergy recovery ventilation is the energy recovery process of exchanging the energy contained in normally exhausted building air and using it to treat the incoming outdoor ventilation air in commercial HVAC systems. This process increases efficiency in commercial HVAC systems while reducing operating costs. During the summer months, the system will cool and dehumidify air entering the building with the “used” air leaving the building. Similarly, during the winter months, the HVAC system will warm and humidify the air using the same process.

The energy recovery ventilation process provides several key benefits. It allows the ability for an operation to meet the ventilation and energy standards set forth by the American Society of Heating, Refrigerating and Air-Conditioning Engineers, as well as improving the indoor air quality and reducing the HVAC equipment requirements and the loads placed upon the components within the commercial HVAC equipment.

This process is attained through the use of an energy recovery ventilator which is a type of air-to-air heat exchanger that transfers sensible and latent heat. The efficiency of this type of system is the ratio of energy transferred between the two air streams compared with the total energy transported through the heat exchanger. As with all manufacturers, specific efficiently ratings vary amount product, as well as location and application. Some systems have been shown to have heat exchange efficiency as high as 70-80 percent, while others are as low as 50 percent. New technology is constantly being developed to increase efficiency ratings and each year new systems are introduced to the market. Check with American Services today,  your commercial HVAC service  near Fenton to see if your operation would benefit from an energy recovery ventilation system.

Calculating Refrigeration Refrigerent Charge

Calculating Refrigeration Refrigerent Charge

refrigeration refrigerant in MOCommercial refrigeration often requires some simple diagnostics to ensure it is running at peak efficiency. Through some simple tests, calculations, and reading of charts, calculating the refrigerant can tell you a lot about your system.

Turn on your commercial refrigerator and let it run for a short time. This will ensure the system is pressurized and operating and full power. Locate the blue low-pressure and red-high pressure valves on your unit. Double check to make sure the valves on the manifold gauge to the low and high pressure valves are closed. Attach the blue-low pressure hose to the blue low-pressure valve on the unit and the red-high pressure hose to the red high-pressure valve on the unit.

At this point you will be starting the test where you will need to record some information. Open the blue low-pressure manifold valve and then the red. Record the low and high pressure readings and temperature readings on your gauges. Disconnect your gauges in the reverse order.

Using the recorded values, consult a refrigerant pressure/temperature chart to determine if the recorded pressure for your unit is at the appropriate level. Lower pressure will typically indicate a low charge while higher pressure will indicate a high charge.

If you suspect there is problem in the system, keep a log of each time your perform this test. If the log indicates a problem then it is recommended to contact a licensed technician to perform a system audit and inspect all components of the unit. Expensive repairs can be prevented through a preventative maintenance program that includes performing this test.

To schedule an estimate for refrigeration repair or maintenance in St. Louis,  contact us today at American Services.

Commercial Refrigeration Systems

Commercial Refrigeration Systems

refrigeration repair in MOCommercial refrigeration often requires some simple diagnostics to ensure it is running at peak efficiency. Through some simple tests, calculations, and reading of charts, calculating the refrigerant can tell you a lot about your system.

Turn on your commercial refrigerator and let it run for a short time. This will ensure the system is pressurized and operating and full power. Locate the blue low-pressure and red-high pressure valves on your unit. Double check to make sure the valves on the manifold gauge to the low and high pressure valves are closed. Attach the blue-low pressure hose to the blue low-pressure valve on the unit and the red-high pressure hose to the red high-pressure valve on the unit.

At this point you will be starting the test where you will need to record some information. Open the blue low-pressure manifold valve and then the red. Record the low and high pressure readings and temperature readings on your gauges. Disconnect your gauges in the reverse order.

Using the recorded values, consult a refrigerant pressure/temperature chart to determine if the recorded pressure for your unit is at the appropriate level. Lower pressure will typically indicate a low charge while higher pressure will indicate a high charge.

If you suspect there is problem in the system, keep a log of each time your perform this test. If the log indicates a problem then it is recommended to contact a licensed technician to perform a system audit and inspect all components of the unit. Expensive repairs can be prevented through a preventative maintenance program that includes performing this test.

To get a quote for refrigeration repair or maintenance in Missouri, contact us at American Services today.

Thermostats for Commercial Refrigeration Units

Thermostats for Commercial Refrigeration Units

thermostat for commercial refrigeration in MOThermostats are an integral component of any refrigeration system as they measure and regulate the temperature. Thermostats act like a light switch, turning on or off the flow of electricity to the refrigerator’s compressor. As a compressor runs the temperature will drop inside of the refrigerator and when the thermostat turns off the compressor, the air will try to warm up to the outside air.

There are a few different options when selecting thermostats for commercial refrigeration units. The three main types are air sensing, pressure sensing, and evaporator coil sensing. Air sensing thermostats are most prevalent in commercial refrigeration units. This type of thermostat will measure the return air in the refrigerator. Air-sensing thermostats will use a straight liquid or gas filled capillary attached to a bulb. The varying pressures with the temperature will open and close the electric current that controls the compressor.

Pressure sensing units are located outside of the evaporator housing near the compressor. The refrigerant which is circulated in the refrigerator and the pressure of that fluid is associated with the temperature inside the refrigerator. The thermostat will utilize the pressure as a means of regulating power to the compressor.

Evaporator coil sensing thermostats measure the temperature of the evaporator coil rather than the air or refrigerant. If a refrigerator is frequently opened or closed, the air temperature can fluctuate tremendously and create frost on the evaporator coil. Air sensing thermostats would not register the frost buildup causing the system to run inefficiently. The evaporator coil sensing thermostat allows for the correction of that problem.

For an estimate on your commercial refrigeration system near Sunset Hills, contact us today at American Services.

HVAC Chillers

HVAC Chillers

hvac chillers in PAAmerican Services commerical HVAC Service in Missouri specializes in repair and maintenance of equipment such as  Trane, a well known manufacturer of commercial HVAC systems for over 75 years routinely creates new and innovative technologies that are incorporated into their commercial HVAC systems. With the introduction of each new technology brings increased efficiency, lower emissions, and more reliable products.

One of the newest commercial HVAC units available through Trane is the CenTraVac centrifugal chiller. As with most commercial HVAC companies, the use of centrifugal chiller technology has been proven to allow for increased efficiency. This efficiency is achieved through an impeller which forces the flow of air to spin faster and faster. Following a form of Euler’s fluid dynamics pump and turbine equation, the energy input to the fluid, or in this case air, is proportional to the flow’s local spinning velocity multiplied by the local impeller tangential velocity. Manufacturers have been able to design units which cause the flow leaving the centrifugal impeller to be near the speed of sound. The capability of efficiency with the centrifugal chillers produced by Trane is at least 13.5 percent better than other manufacturers.

It is also important to develop an understanding for quality of construction. Research has indicated that with proper preventative maintenance and routine system audits, units such as the CenTraVac chiller are designed to be in operation for more than 50 years. Additionally, emission ratings of this new technology have demonstrated to be four times better than other centrifugal chillers. As new federal government and EPA regulations continue to be introduced, choosing a commercial chiller which is rated for high efficiency will reduce operating costs and decrease the potential of issues with governmental agencies.

Annual Maintenance for HVAC Systems

Annual Maintenance for HVAC Systems

HVAC technician in MOAmerican Services commercial HVAC maintenance and repair service near Fenton knows that HVAC systems are an essential component of ensuring high productivity and comfort within any work environment. Additionally, HVAC systems provide clean air for breathing and staying healthy in the workplace. Without proper annual HVAC maintenance, systems can become inefficient, unhealthy, and diminish moral within the workplace. Not to mention the added costs to repair the system.

All filters must be changed or cleaned according to the maintenance cycles outlined by the manufacturer or installation company. All businesses are different and may require differing timeframes between replacement or cleaning. Drive belts should be inspected while changing or checking the filters. Over time drive belts will wear out and brake. Broken drive belts will lead to inoperable systems.

Evaporator and condenser coils need to be cleaned annually using water. High pressure power washers are not recommended as they will damage the coils reducing the efficiency of the unit. All dirt and debris needs to be removed to ensure proper airflow. If your unit has a problem with mold, products can be applied to eliminate the mold and prevent future growth.

Air ducts should be inspected every year. Over time, dust and dirt will settle and stick to the walls of ducts. Build up of foreign particles can also cause mold or bacteria growth. Soiled ducts need to be professionally cleaned and disinfected by a licensed company. This maintenance task is essential for the health and safety of employees as they are constantly breathing the air that is passing through the ducts.

Having an annual HVAC preventative maintenance plan will ensure your system is running and peak efficiency.

AC Systems – Basics of Load Calculation

AC Systems – Basics of Load Calculation

commercial air cooling system in MOAmerican Services Cooling installation and repair in Saint Louis knows that the first step in A/C System design is to select indoor and outdoor summer and winter design conditions. Today, computer programs have been designed to provide very precise load determinations but an understanding of the process is required for anyone looking at a new system.

Computation of the peak cooling load. Heat gain is composed of or influenced by the conduction heat gain through opaque portions of the building’s skin; the conduction plus solar radiation through windows and skylights; the building internal loads such as people, lights, equipment, motors, appliances, and devices; and outdoor air load from infiltration. The heat gain is equal to the cooling load required.

Ventilation rates must also be considered in A/C cooling system design. Ventilation rates have typical values and fit into the equations. For example, bedrooms have a typical ventilation rate of 30 cubic feet per minute per room compared dressing rooms of only .5 cubic feet per minute per square foot.
Central air conditioning cooling systems are typically used where several spaces with uniform loads will be served by a single unit and where precision control of the rooms are required. Cooling coils can be direct expansions or chilled water. Within this type of a system there are multiple options for condensers, cooling towers, and ground-loop systems based on the specific application for the location.

Unitary air conditioning systems are typically limited to loads less than 100 tons. These systems are packed in self-contained or split configurations. Again depending on the specifics of your application each option will have benefits and drawbacks.