Service & Maintenance
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Online-only “Service and Maintenance” articles focus on troubleshooting service call issues and revisiting HVAC basics.

ARTICLES

Mastercool: Leak Detector

Leak Detector Maintenance and Care

Quality care and testing will help find leaks the first time
Orr-hs
Bryan Orr
May 27, 2019
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A good leak detector is a big investment and one of the more important tools a tech has on the truck. One thing that I have learned is that with leak detectors care, maintenance, and testing is a huge part of finding leaks the first time.
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A Comfort Complaint Follow-Up

Is it the equipment or the service that's causing the performance issues?
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Jim Johnson
April 8, 2019
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The equipment in this month’s troubleshooting situation is a split system that has only been in service for two years, but there is a lot of history — several service calls since the equipment was installed, and an on-going complaint that the system just doesn’t keep the ranch-style home comfortable.
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Three-Phase-ACHR-NEWS

Three-Phase Power and Voltage Imbalances

A little electrical knowledge can go a long way in troubleshooting HVAC systems
Orr-hs
Bryan Orr
March 18, 2019
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In HVAC, we rarely need to have a deep understanding of electrical design. But there are a few cases where a little understanding can go a long way in identifying issues before they cause trouble, and that is the intent of this short article.
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Thermostat troubleshooting

A Heat Pump That's Not Keeping an Office Warm

The temperature on the thermostat does not match the temperature of the conditioned space
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Jim Johnson
March 4, 2019
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In this troubleshooting situation, the equipment is an air source heat pump and the customer’s complaint is that even though the thermostat is set at 70° F, the temperature in the conditioned space remains near 65°.


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AC System

A Frozen Coil Can Hinder A/C System Effectiveness

Ice forms on the heat exchanger and acts as an insulator
Ron-roth
Ron Roth
February 18, 2019
One Comment

One common customer complaint about their central HVAC systems is that the a/c system is running but not providing any cool air to the controlled space. One of the most common reasons for this situation is that the a/c condenser or evaporator coil has frozen over. This term or phrase literally means that ice has formed on the heat exchanger, preventing the transfer of heat since the ice is acting as an insulator.


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