why compressor fail Certification Review Exam Questions And Answers Verified Solution.

when symptoms are treated as they cause of a compressor failure, the real cause remains undetected into a repeat failure occurs. - correct answer true improper maintenance leading to obstructed airflow through the heat exchangers can cause major system components to have adverse effects on compressors. - correct answer true suction line accumulators are often installed in systems when liquid flooding or slugging conditions are anticipated. - correct answer true in order to effectively diagnose an HVAC system that technician must know how the system should operate when it's operating properly so he can recognize when it's not. - correct answer true a very quick method of determining if a cylinder head gasket has blown as a result of a liquid slug would be to? - correct answer feel the bottom of the suspected head for unusually warm temperatures. liquid slugging may occur during? - correct answer rapid changes in the system operating conditions, flooded starts cause by liquid of cycle migration, thermal expansion valve hunting. the first and usually the easiest component to inspect within a compressors are? - correct answer head gaskets, valve plate and valves the system accessories play an important role and provide specific functions for the HVAC system however they may also have negative effects on the compressor if they are______or______? - correct answer missed applied, not working properly list three compressor failures may be attribute to. - correct answer mechanical, electrical, failure due to misapplication list three components that can cause a compressor to operate in a deep vacuum leading to potential damage if they are malfunctioning. - correct answer liquid line solenoid valve, liquid line dryer restriction, suction line dryer restriction there's three operating conditions that will result in loss of lubrication due to insufficient oil return to the compressor - correct answer low refrigerant velocity, compressor short cycle, piping errors airside issues are known to be significant cause of flooding list four conditions that could cause airflow problems - correct answer block air flow, defective fan motor, broken fan belt, clothes stampers explain how the Piston wrist pin gets lubricated - correct answer oil vapor mixture collecting on the top of the wrist pin reservoir at the top of connecting rod during the inspection of a failed compressor you find a broken discharge valve list three components to check that may have caused this condition - correct answer TXV overfeeding, coil restriction, crankcase heater defective after a semi hermetic compressor has failed, it is very important that we determine the root cause of the failure to prevent the replacement compressor from failing. explain what we must do before sending the failed compressor to rebuilt to prevent a repeated failure. - correct answer tear down and inspection of the failed compressor can provide valuable information about the root cause of failures. after inspection of a fail compressor you notice a discoloration of a valve plate and or valves. list four operating conditions that may have caused this to happen. - correct answer slugging, flooding, low suction pressure, contamination. what is the single most important preventative maintenance service that we must provide to our customers to prevent premature compressor failures. - correct answer routine coil maintenance