How to Diognose Refrigerant Overcharge, Fixed Orface
Overcharged systems will experience excessive energy consumption, possible compressor starting problems, internal overload tripping, indoor air humidity complaints and compressor failure due to liquid...
View ArticleHow to Diognose Refrigerant Overcharge, TXV System
When a system with a TXV metering device is overcharged, the suction pressure and superheat may appear normal. The normal conditionsare a result of the TXV regulating the refrigerant flow independent...
View ArticleHow To Diognose Low Evaporator Heat Load, Fixed Orifice
Low evaporator heat loading occurs when there is not enough heat entering the refrigerant at the evaporator coil. This condition can cause the evaporator coil to form a coating of frost or ice on it’s...
View ArticleHow to Identify Low Evaporator Heat Load, TXV
Low evaporator heat loading occurs when there is not enough heat entering the refrigerant at the evaporator coil. This condition can cause the evaporator coil to form a coating of frost or ice on it’s...
View ArticleHow to Diognose High Heat Load, Fixed Orface or TXV
High evaporator heat load occurs when there is excessive heat entering the refrigerant at the evaporator coil. This condition can cause the compressor to shut off on it’s internal overload, or trip...
View ArticleDiognosing Liquid Line Restrictions
Restrictions in the liquid line will prevent the evaporator coil from receiving the proper amount of refrigerant. The restriction will cause a large pressure drop between the condenser and the...
View ArticleHow to Diognose Restricted Metering Device
Restrictions in the metering device will prevent the evaporator coil from receiving the proper amount of refrigerant. The restriction will cause the suction pressure to be too low. With low suction...
View ArticleHow to Diognose an Over-Feeding Metering Device
An evaporator coil that is receiving a higher than normal flow of refrigerant through the metering device will operate in a flooded condition. The system may experience high humidity complaints,...
View ArticleHow to Diognose Non-Condensables
Air, nitrogen, hydrogen and other foreign gasses present in a refrigerant system are referred to as non-condensables since they will not condense into a liquid at pressures encountered in a...
View ArticleHow To Diognose and Open Compressor Winding, Single Phase
A PSC motor will not start with an open winding. It may hum until the internal overload trips. Disconnect the power to the unit Discharge the capacitors Disconnect the wires from the compressor...
View Article
