The compressor provides compression which is an integral part of the refrigeration process. The old compressor was condemned for electrical burnout. The windings in the old one burned up and caused the circuit breaker to trip. (more…)
HVAC Centrifugal Compressors - Centrifugal compressors are used in many applications including pipeline transport of natural gas along with many other related applications including vapor compression refrigeration. These compressors have different operating limitations than the reciprocating compressor, the scroll compressor, and the rotary compressor.
They work in an operating range where it works efficiently however outside of this range, either the over or under that operating range is basically useless. Other issues make them not ideal for use in certain applications because of the operating range issues. (more…)
Actuators for Chilled Water Valve - These chilled water actuators control the flow rate for a chilled water system in a data center. There are various sequences of operations for chilled water systems and the sequence of operations is usually always different from one chiller plant to another chiller plant. (more…)
About Chilled Water Systems HVAC Hydronics - Chilled water systems are mainly used in large commercial HVAC air conditioning systems and industrial cooling applications although there are some residential and light commercial HVAC chilled water systems in use. Chilled water systems are popular because they use water as a refrigerant. Water is far less expensive than refrigerants. This makes them cost-effective, especially in commercial HVAC air conditioning applications. (more…)
Chilled Water Pipe Vibration Isolators - Vibration isolators protect the chilled water piping from receiving vibrations transmitted through the piping when the chillers are running. The vibrations can create problems not only for the chilled water piping but also for the building’s structure. The vibration isolators reduce or eliminate the vibrations that can be transmitted by the chillers. (more…)
Crankcase Heaters and Compressors | HVAC Refrigeration. Hello, I have a question about crankcase heaters and compressors. I am aware that they keep the refrigerant from saturating in the compressor when not running. However, if the refrigerant is R-22, it becomes saturated at approximately 40 degrees. We know the a/c is only operating at warm ambient temperatures. When it is off for the evening hours & the ambient temps stay above 40 degrees, why would one need to have a crankcase heater? Why do we need it on during this temperature range, or are crankcase heaters designed to be activated only during the colder months? Also, if one installs unregulated crankcase heaters (always operating), can this be a negative factor for the compressor life? (more…)
DDC Controlled Chilled Water Actuator | HVAC Automation. This chilled water actuator is attached to a valve which supplies chilled water to the air handling unit. The air handling has a chilled water coil. The actuator modulates the valve based on a set point inside the DDC program. If the program has trim and respond capabilities the set point will rise up and down based on demand. Demand from the VAV boxes or the HVAC zones. Most DDC controlled actuators work off of a DC volt or current signal. (more…)
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…)
Large Condenser Pump for a Chilled Water System - This large HVAC condenser pump serves a new chiller located in a data center. This pump pumps condenser water through the condenser chiller barrel and to cooling to reject the heat absorbed in the chillers evaporator barrel. The pump works to move the water from the chiller to the cooling and then back through the chiller again. The water is diluted with a glycol solution to prevent freezing in the wintertime when the chiller needs to run at low ambient temperatures. (more…)
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…)
HVAC Tip - Some people refer to refrigerant as Freon. So when something is wrong with their HVAC system they say, “I have a Freon leak”. Freon is a name trademarked by Dupont for R-22. R-22 is being phased out because it contains chlorine. While Freon will soon be a thing of the past, the name Freon has found its way in our lexicon as a reference to refrigerant, any type of refrigerant.
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Actuators for Chilled Water Valve - These chilled water actuators control the flow rate for a 
About Chilled Water Systems HVAC Hydronics - Chilled water systems are mainly used in large commercial HVAC air conditioning systems and industrial cooling applications although there are some residential and light commercial 
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 
Large Condenser Pump for a Chilled Water System - This large HVAC condenser pump serves a new chiller located in a data center. This pump pumps condenser water through the condenser chiller barrel and to cooling to reject the heat absorbed in the chillers evaporator barrel. The pump works to move the water from the chiller to the cooling and then back through the chiller again. The water is diluted with a glycol solution to prevent freezing in the wintertime when the chiller needs to run at low ambient temperatures. 
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.