Service & Maintenance

Maintaining Pumping Systems Effectively

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Effective pump maintenance allows industrial plants and commercial facilities to keep pumps operating well, to detect problems in time to schedule repairs, and to avoid early pump failures. Regular maintenance also reveals deteriorations in efficiency and capacity, which can occur long before a pump fails.
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Btu Buddy 92: Pneumatic Control System

By Bill Johnson
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The customer’s complaint on this call was an overall overheating of his building. The manager told Bob, “We arrived this morning and the entire building was hot and keeps getting hotter.” He led Bob to the basement where there was a boiler. Bob found that the system had pneumatic controls.
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Troubleshooting Challenge: A Gas Furnace That's Heating Intermittently

By Jim Johnson
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When the customer calls for service, he tells you that when things got very cold in the house, he disconnected the power supply to the unit, and then, after turning the 120-volt service switch back on, the operation seemed normal and the house got warm “for a day or so.” But the failure repeated.
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Btu Buddy 91: Underground Refrigerant Leak - Part 2

By Bill Johnson
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Bob’s service call yesterday involved a leaking underground refrigerant piping system. Bob replaced the refrigerant lines, leak tested the lines, and left them yesterday afternoon under 150 psig of pressure. He has now returned to the job the next day to see if the pressure held and to check for moisture in the system.
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Refrigerant Retrofitting

By Mike Taitano
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For several years, refrigerant retrofitting has been a common procedure for a lot of the commercial kitchen and restaurant equipment I work on, so I’ll go over some of the things I’ve learned that might help you save some time and money on your own retrofit projects.
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Btu Buddy 90: Underground Refrigerant Leak

By Bill Johnson
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Bob was called to a job that had a no cooling complaint. This was a new customer and Bob wanted it to be a good experience for the customer. It was a small stand-alone store building with a 3-ton cooling only unit. Bob determined this was a low charge problem. He installed his gauges and discovered the unit did not have any refrigerant in it.
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Troubleshooting Challenge: A Small Room-Size Heat Pump That's Not Heating

By Jim Johnson
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In this troubleshooting situation, we have a customer who has called to say that their 12,000 Btu through-the-wall unit is “blowing cool air even though it’s set for heat.” The unit is a heat pump with a three-speed motor. It operates on 240 vac.
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Btu Buddy 89: Condenser Under Water

By Bill Johnson
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The dispatcher called Bob and sent him to a job that really sounded like a problem. There had been a hard rain and a customer had a condensing unit that had been under water that morning due to high water from a creek behind his house. The owners were on a fixed income and wanted to get the repair at the best possible price.
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Life Safety Damper Maintenance and Inspection

By Mark Belke
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Fire and smoke dampers are a proven and effective way to protect duct and air-transfer openings in walls, barriers, partitions, corridors, and shafts. This article includes the basic testing, installation, and maintenance requirements for life safety dampers.
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Btu Buddy 88: Follow-Up on a Dirty Water Cooled Condenser

By Bill Johnson
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Bob has been on a job at a convention center with a 100-ton water cooled condenser. The owners are anxious for Bob to get the a/c back on, but Bob said the tubes must be cleaned before the unit will run. He has called the shop and asked for a helper and a tube cleaning machine to help him get the unit running as fast as possible.
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