Air conditioning system commissioning and startup is the process of inspecting a new air conditioning installation, and verifying that the new system is running properly and efficiently. This article describes the commissioning procedure.

A very common freezer repair trouble call is a frozen evaporator coil. When you open the door to inspect the coil, look around for signs of outside air migrating into the box.

The chiller maintenance tool that contributes most to a chiller’s overall efficiency is the daily log. An accurate daily log will provide a daily snapshot of the chiller’s operating characteristics and make abnormal conditions easy to spot.

This article discusses the refrigeration cycle, highlighting the various components - compressor, condenser, metering device, and evaporator - and the flow of refrigerant through the system.

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.

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.

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.