Service & Maintenance

Online-only service and maintenance articles.

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Troubleshooting Challenge: A Gas Furnace That’s Operating Intermittently

By Jim Johnson
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Your troubleshooting situation involves a standard natural gas, induced draft, hot surface ignition system furnace. This is a new installation that has been accomplished in anticipation of the upcoming heating season, and the problem is that during the initial start-up the unit did not perform properly.


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Btu Buddy 137: Heat Pump Problem in the Summer

By Bill Johnson
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Bob and Tim were on their way to a no cooling call; in fact, it sounded like a heating call. The customer has a bonus room on the third floor that used to be attic space. When Bob and Tim arrived, the customer told them, “The bonus room upstairs seems much too hot and the air coming out of the registers is hot to the touch.”


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Ammonia Chiller Provides Tailor-Made Refrigeration Solution for Ice Rink

Chiller Features a Very Low Ammonia Charge
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Live Active Leisure needed to replace its existing system due to the legally imposed phaseout of HCFCs in the United Kingdom. Johnson Controls proposed the installation of an air-cooled ammonia chiller complete with heat recovery and a very low ammonia charge due to the location being close to a pedestrians’ footpath.


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10 Easy Maintenance Tips to Save Energy on Cooling Towers

A Well Maintained Unit Will Continue to Function at the Original Optimum Efficiency
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Save up to 15 percent on electricity costs with these simple preventive maintenance tips for cooling tower. Routine maintenance also helps to conserve water and extend the operating life of cooling equipment.


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Btu Buddy 136: Water-Cooled Chiller Problems - Part 2

By Bill Johnson
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Bob and Tim were getting set up to clean the condenser tubes in a chiller. They were doing this job at night during overtime hours because they discovered the problem earlier that afternoon and the customer said the chiller needed to be able to operate at full capacity tomorrow for a conference.


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Troubleshooting Challenge: A System That’s Blowing Warm Air in July

By Jim Johnson
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This month’s troubleshooting situation involves an air-to-air package unit heat pump that is approximately six years old, and the customer’s complaint is that, rather than providing cooling, it’s just blowing warm air.


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Btu Buddy 135: Water-Cooled Chiller Problems - Part 1

By Bill Johnson
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Bob and Tim were on their way to a no cooling call at an office building with a 100-ton water-cooled chiller. As always, management was in a hurry to get the problem solved because the tenants were hot.


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Study Tests Effectiveness of Rooftop Unit Preventative Maintenance

Looks at Whether Retailers Save Money by Minimizing Risk of Equipment Failure and Reducing Service Calls
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Alpine Mechanical Services has announced the completion and results of a collaborative energy efficiency study on rooftop units conducted by Alpine Mechanical, Siemens Industry, and Nexant. The study tested the efficacy of HVAC preventative maintenance best practices in a retail environment.


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Btu Buddy 134: An Unusual Service Call

By Bill Johnson
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Bob and Tim were on their way to a no cooling call. The spring season was still cool at night and warm in the daytime. The customer told the dispatcher, “The unit started up at about 10:30 a.m. this morning and made a noise, but did not cool the house, even though it is still running.”


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Troubleshooting Challenge: An A/C System That’s Not Keeping the House Comfortable

By Jim Johnson
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In this month’s troubleshooting situation, our customer’s description of the problem is “not cooling” and “blowing warm air,” and the equipment that is supposed to keep this residence comfortable is a split system that has been in service for 16 years.


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