There are several symptoms that indicate the presence of an excessive amount of refrigerant in the system. 1. Long running time of the unit. When…

There are several cleaning solutions in the market suitable for condensers. They are primarily alkaline or acid, about the same price and about equally effective.…

Different types of refrigerant produce different head pressures. In air-cooled condensers, a normal head pressure should correspond to a temperature of about 30°F higher than…

When a residential unit runs warmer than normal (or does not cool), the problem can be due to a leak or a restriction in the…

1. Turn off the system and listen where the capillary tube connects to the evaporator. If you don’t hear a hissing sound, there may be…

A restriction of refrigerant flow is caused by the formation of ice from moist air in the system. Air can penetrate into the system from…

1. Low-side pressure reads lower than normal. 2. High-side pressure reads lower than normal. 3. Low amperage reading. Read the amperage the compressor draws. Do…

Dirty condensers cause (a) higher evaporator temperatures and consequently higher temperatures in the cabinet, (b) higher operating temperatures in compressors and condensers, (c) longer running…

CAUTION: Do not touch the oil from a burnt out compressor as the acid will cause a burn. Always wear rubber gloves. Also, safety goggles…

Compressors often burn out by overheating caused by above-normal head pressures. Laboratory tests have proven that presence of air, dirt, and moisture in the sealed…