by High Performance HVAC | Commercial HVAC |
Generators Serving Small Data Center | Critical Facilities - These generators serve a small data center giving the data center backup emergency power in the event of a loss of utility. Most data centers have redundant power from the utility and backup generators. In other words, the utility will provide two sources of utility power from two different power stations or sub-stations so if one source station loses power for whatever reason the system automatically transfers to the backup source of power or the other power or substation. (more…)
by High Performance HVAC | Commercial HVAC |
HVAC Reznor Heating System – this Reznor unit heater provides heating for warehouses, garages, and other open spaces which can be heated with unit heaters. Unit heaters are ideal for big open areas which need heating without ductwork being used to channel the air into the open space. (more…)
by High Performance HVAC | Refrigeration |
Condensing Unit Frozen Wont Turn Off - What you can expect to learn from Condensing Unit Frozen won’t Turn Off article: this article is an answer to a question taken from our email by a visitor to High Performance HVAC. We often use the questions we get in the email as a guide to writing articles. The topic is a condensing unit that will not turn off, and it is freezing up. From my experience in the field and using my HVAC knowledge, I offer the readers a list of what could cause this problem. We hope it helps you.
What’s the possible problem with a frozen air conditioner condenser that won’t turn off except with the breaker? (more…)
by High Performance HVAC | Technical Reference |
Basic Electric Circuits for HVAC - If you are new to electricity and want to learn you need to start with the fundamentals of electricity first. Included in the basics of electricity and the primary lesson in electricity is electrical safety. Electricity can be very dangerous and safety needs to be practiced. Electricity is invisible to the eye and can only be felt when touched. (more…)
by High Performance HVAC | Direct Digital Controls |
HVAC 3R NEMA Rated Control Panels - These control panels offer resistance to inclement weather. They house the DDC controllers for two small chillers and two air handlers. The chillers provide chilled water for air conditioning to the air handlers. (more…)
by High Performance HVAC | Water Heaters |
Water Heater Types - Selecting a hot water heater can be confusing especially if you are not aware of the types of water heating systems available to you. When you go out to buy a new car you want all the information you can get about the car you are buying from how economical it is to how reliable it is to the type of engine it has under the hood. (more…)
by High Performance HVAC | Technical Reference |
Grounding and Bonding Electrical Systems | NEC Code - National Electrical Code Article 250 is all about grounding and bonding as represented in this photo where electrical systems are grounded and bonded to the buildings steel structure.
There are many different rules in the NEC (National Electrical Code) pertaining to grounding and bonding because grounding and bonding are important for safety reasons. Electricity will take the path of least resistance so if there is a short in the system the grounding system will be the path for the electricity instead of the motor or load that experiences the short. (more…)
by High Performance HVAC | Commercial HVAC |
Old McQuay Chiller Control Panel - This panel is part of the controls for an older McQuay chiller. New chillers whether they be McQuay, Trane, York, or Carrier chillers still require these types of controls in them to make them work.
This part of this electro-mechanical control panel consists of contactors and switches (both manual and automatic) for electro-mechanical control of this chiller. To the right is the main power which feeds the unit with three-phase main power. (more…)
by High Performance HVAC | Commercial HVAC |
DX CRAC Unit Condensers | Critical Facility HVAC - Most data centers do not utilize HVAC DX (Direct Expansion) CRAC units or air conditioning but instead use chilled water systems to provide cooling for the data center. In smaller buildings such as remote telecom buildings, DX air conditioning systems are used to keep the equipment cool and operating efficiently. (more…)
by High Performance HVAC | Direct Digital Controls |
Direct Digital Controls DDC or DDC Systems offer a high level of control for building mechanical and electrical systems. Additionally, the modern state-of-the-art direct digital controls have the ability to offers trends of data points of HVAC/Electrical equipment. Trending can be used to increase efficiency and troubleshoot problems with mechanical equipment. DDC integration can occur with any type of mechanical or electrical system in the building.
Additionally, the system can communicate via the internet for remote monitoring and control. Alternative names are building automation systems, building management systems, and energy management systems. (more…)
