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Category Archives: Commercial HVAC

Unit Heater Mechanical Room Equipment Protection


Unit Heater Mechanical Room

How Water Unit Heater in a mechanical room

Unit Heater Mechanical Room Equipment Protection – Mechanical rooms have very important equipment that needs to be protected. Often mechanical rooms are not conditioned and subject to outside temperatures and freezing conditions that can freeze piping inside the mechanical. For that reason mechanical rooms often have unit heaters located there to protect piping and other things that cannot be frozen or subject to freezing conditions. The components and sequence of operation are fairly simple. The main components in a hot water unit heater include a fan, a valve, and of course the piping and coils along with the cabinet.


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Disconnect and Electric Motor Starter with Overloads


Disconnect and Electric Motor Starter is used for turning the power off and on the an electric motor used in HVAC applications. It also has overloads built into the starter so if one of the windings begin to pull too many amps the overloads open the circuit and the motor stops operating. Motor starters can be used for single phase and 3 phase motors and offer a manual way to turn the motor off or disconnect the electricity to the motor to prevent it from starting for maintenance or repair of the motor or peripheral systems. Control wiring can be integrated into the motor starter for automatic control and or monitoring. Monitoring usually occurs with auxiliary contacts or status contacts near the starter. Some solid state motor starters will also detect and stop a motor if it is turning backwards. It is important when troubleshooting motor problems that the technician understand the motor starter and the limitations of the motor starter.


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Chiller Barrel Evaporator for Chilled Water Systems | Air Conditioning


Chiller Evaporator Barrel for a smalled air cooled chilled water system

Chiller Evaporator Barrel

Chiller Barrel Evaporator – A chiller evaporator barrel exchanges heat between one refrigerant and another. Usually the primary refrigerant is R-22, R-134A, or some other blend or alternative HFC. The secondary refrigerant is water. This water is circulated throughout the building where it passes through piping and coils. This is generally in most cases a forced air coil where the heat is removed from the air by a heat exchange process with the water and the coil. The cooler air is then forced through duct work and into the space to be conditioned.


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Boiler Commissioning & Functional Testing – Quality Assurance


Boiler Commissioning & Functional Testing – Quality Assurance

Boiler Commissioning & Functional Testing - Quality AssuranceBoiler Commissioning & Functional Testing – Commissioning (Cx) any type of HVAC equipment is many different procedures from the beginning of the commissioning process to the end of the process. One of the most important procedures during the Cx process is functional testing. The functional testing always precedes the final testing where a test of all the combined equipment is done in an integrated systems testing. Once successful testing is completed and all discrepancies corrected a final commissioning report is generated including all the test data and information collected during the entire process of testing and commissioning.


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Steam to Hot Water Generator | HVAC Heating


Steam to Hot Water Generator | HVAC HeatingThere are some facilities including campus like complexes that use a centralized steam plant as a steam to hot water generator. The steam is generated from a large boiler and piped to various buildings around the campus or whatever facility is used. Typically several buildings utilized the steam for heating and hot water for domestic uses including showers, washing dishes, washing clothes and other domestic uses. The steam is usually high pressure and for this reason it is safer to deliver it to a mechanical room, reduce the pressure, and run the steam through a steam to hot water generator. A steam to hot water generator is nothing more than a big heat exchanger where at one end steam is delivered and at the other end water is delivered. As the steam runs through the exchanger it exchanges heat with the steam heating the water. Thus, producing hot water for domestic use and heating use in the winter.

Steam to Hot Water Generator | HVAC Heating


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TUESDAY, July 07, 2015

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Carbon monoxide detectors are important to own for those people who burn fossil fuels for heat. Carbon monoxide is a flammable, colorless, odorless, tasteless toxic gas produced during incomplete combustion of fuel - Natural Gas, Oil, Coal, Wood, Kerosene, etc. Someone suffering from carbon monoxide poisoning generally has severe headaches, nausea, and sinus problems. These symptoms generally begin with mild effects and people usually remain unaware of what the exact problems are until, sometimes, it is too late. How many cracked heat exchangers or faulty furnaces are out there that no one knows anything about except a slight headache and nausea? Don't take any chances, get your carbon monoxide detector and call your local heating and air conditioning company for a heater inspection today. Read more on this subject on the Furnace Page.

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