Service & Maintenance

Btu Buddy 46: Air in a Hot Water Heating System

January 22, 2007
In this installment of the Btu Buddy series, the dispatcher sends Bob to a motel that is five stories high with the complaint that the top floor does not have any heat. Bob discovers air in the hot water heating system.
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Commercial Refrigerator Troubleshooting

January 8, 2007
Here are some tips for your next commercial refrigerator troubleshooting call. This article provides tips for various conditions, including handling a unit that’s dead, that’s freezing up, or that might have a compressor problem.
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Btu Buddy 45: Grounded Electric Heat Coil Causes Fan to Run

December 25, 2006
In this edition of the Btu Buddy series, Bob goes on a call where a heat pump indoor fan motor is coming on from time to time even when the thermostat is off. He finds that a grounded heat coil is causing the intermittent fan operation.
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A Guide to Understanding HVAC Filter Maintenance

December 11, 2006
Proper HVAC filtration is at the heart of indoor air quality. Filters will only do their job and perform as specified, however, when they are maintained correctly.
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Btu Buddy 44: Stolen Outdoor Unit for a Heat Pump

November 22, 2006
In this installment of the Btu Buddy series, Bob finds that a small retail store using a heat pump has had the outside unit stolen, most likely for the copper. He then moves on replacing the unit and preventing this from happening again.
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HVAC Service Tips for New Technicians

November 13, 2006
This article, written by an industry veteran, provides some general HVAC service techniques picked up over the years. It's designed to help technicians who are just starting out in the trade.
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Btu Buddy 43: A Smoking Oil Furnace

October 23, 2006
In this edition of the Btu Buddy series, a customer smells smoke coming from her oil furnace. Bob checks it out and finds that the furnace is not drafting. He inspects the chimney and discovers an obstruction.
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Fan and System Troubleshooting

October 9, 2006
This article is a guide for identifying the most common problems encountered in fans and air-handling systems. This is often an "art" and not a "science" because many problems are subtle and hard to diagnose.
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Btu Buddy 42: 50-Ton System With Defective Solenoid Valve

September 18, 2006
In this installment of the Btu Buddy series, the customer's building is warmer than normal. Btu Buddy notes that this system has capacity control. Bob finds that one of the solenoid valves is not working.
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Air Conditioning Freezing

September 4, 2006
There are a variety of things that can cause air conditioning freezing. The first thing to do is see if the indoor (evaporator-air handler) fan and compressor are both running at the same time.
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