Find Tonnage on AHU | HVAC Equipment Nomenclature - How do I find out the tonnage on an AHU (Air Handling Unit)? The label/tag has faded all I have on file is the model number and the serial number, make.
Question Posted By Francisco the Building Engineer on May 3, 2011
Refer to the manufacturer’s website for their HVAC nomenclature of the model number and serial numbers and how those numbers correspond to the tonnage and other technical data. Or you can call your local dealer for the manufacturer and they will tell you. (more…)
Preventive Maintenance Air Handlers - These air handlers provide air conditioning for a zoned VAV system. The air handler is an integral part of an air conditioner system. The air handler contains a blower, air filters, some coils (DX or chilled water), hot water coils (not all air handlers have heating coils in them), and some controls. (more…)
Air Conditioner Condensation Water Dripping - It’s the heat of summer or even the beginning of the season. You turn on your air conditioner for the first time. Hopefully, you’ve already had all the preventive maintenance checks done, and there are no problems. Everything is working fine, at least for now. Suddenly you notice water around the air conditioner, and you know you have a problem. You have air conditioner condensation dripping water everywhere. (more…)
Air Conditioner Condensation Problems - It is important for air conditioning preventive maintenance to be performed on your system to avoid problems. Condensation water leaking near the air handling unit can be avoided with proper air conditioning repair and preventive maintenance. Normally this is a very simple problem that can be fixed in less than 30 minutes. Here is a list of what can cause water around the outside of the air conditioning air handler unit. (more…)
Boiler Piping Plant Renovation - Hot Water Boiler Piping for a commercial boiler application. Boiler project being renovated and getting all new DDC controls for optimum hydronic control and efficiency. Boilers are an excellent way of providing good hot water heating to a large building or community.
In this case, new boilers were installed to replace the old inefficient boilers. The piping was rearranged and a hot water boiler economizer preheater added to make efficiency better. New controls were added for remote monitoring and control and to improve efficiency. Lastly, the entire plant got a makeover to make things more reliable, efficient, and modern. (more…)
Air Conditioner Squirrel Cage Blower | HVAC blower motors move the air through the system. The blower motor is sized based on the amount of air flow necessary for the system. This blower motor is the supply fan for the supply air in a large commercial York AHU. An AC and heatingforced air system is sized based on load. The load factors include heat loss and heat gain, number of people in the building, types of rooms served, factoring in heat produced by equipment such as computers and other heat producing equipment. (more…)
Caution is always advised around mechanical and electrical equipment including the air handler. Turn the power off before removing any panels.
Air Handlers - An air handler is usually located in the garage, a closet, or in the attic (unless you have a package unit then the air handler is incorporated into one system). It is essential to any AC unit and heating forced air system. All AC units need an air handler or way to move air. It can be a part of your furnace and houses the evaporator coils, the blower motor, and some HVAC controls. It can be an up-flow, downflow, or horizontal flow AHU (air handling unit). (more…)
Air Conditioning Preventive Maintenance | HVAC Spring Cleaning - Do You Benefit from Maintenance Agreements?
Air conditioning preventive maintenance is a thorough check of the air conditioning system by a professional HVAC Technician. The technician will check the following:
Warning!! blowers can cause injury if you do not turn the power off! Additionally, blowers that are belt-driven can be harmful to loose clothing and fingers. Be very cautious when working around moving parts such as blowers.
Air Handler Blower Motor - All air handling units have a blower located inside the air handler cabinet. The air handler blower motor has a motor that drives it. Some air handling unit blowers are direct drive and some are belt driven.
Many light commercial and residential blowers are direct drive blower motors by the motor’s shaft while many commercial air handling units are belt driven by the blower motor and some sheaves attached to the blower motor shaft and the shaft attached to the blower wheel.
Some sheaves are adjustable and some are not. If the belt is slipping always change the belt first before adjusting the sheave. Adjusting the sheave can cause the unit to produce more or less than designed airflow. Sheaves are typically set by Testing and Balancing HVAC Technicians. (more…)
Air Conditioning Service Repair - No matter what name brand (York, Trane, Carrier, Goodman, Lennox, Rheem) of air conditioning and/or heating unit you purchase some time or the other you will need to have that air conditioning and heating equipment checked for a problem and repaired. Even if you have regular air conditioning maintenance done. While there are air conditioning and heating manufacturers that engineer quality into their air conditioning and heating equipment, that equipment is prone to breakdown simply because it is a mechanical/electrical device and will need repair sometime throughout its useful life. (more…)
HVAC Tip - A thermocouple is commonly used in standing pilot gas furnaces and water heaters are technically referred to as a copple element and produces millivolts when heat is applied to the tip. This millivoltage is necessary to keep the pilot valve inside the gas valve open. If the pilot flame goes out, the thermocouple stops generating millivolts. Without the millivolts, the valve closes thus preventing gas from escaping when there is no flame. Thermocouples fail because of oxidation. It is recommended that you keep the pilot lit throughout the year to prevent excess oxidation. The thermocouple can be found in many different types of gas furnaces, gas logs, and gas water heaters. Learn How to Test a Thermocouple with a Multi-Meter
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Preventive Maintenance Air Handlers - These air handlers provide air conditioning for a zoned VAV system. The air handler is an integral part of an air conditioner system. The air handler contains a blower, air filters, some coils (DX or chilled water), hot water coils (not all air handlers have heating coils in them), and some controls. 
Air Conditioner Condensation Problems - It is important for 
Air Handlers - An air handler is usually located in the garage, a closet, or in the attic (unless you have a package unit then the air handler is incorporated into one system). It is essential to any AC unit and heating forced air system. All AC units need an air handler or way to move air. It can be a part of your furnace and houses the 
Air Handler Blower Motor - All air handling units have a blower located inside the air handler cabinet. The air handler blower motor has a motor that drives it. Some air handling unit blowers are direct drive and some are belt driven.
Air Conditioning Service Repair - No matter what name brand (