Compressors depend upon their valves and rings to provide a seal between the high-pressure and low-pressure sides of the system and the compressor. If either…
Author: matt
A compressor is generally considered to be seized if it hums but will not start, and draws locked rotor current for several seconds as measured…
The most common types o f compressors encountered when servicing residential and light commercial equipment are the reciprocating, rotary, and scroll-type hermetic compressors. In a…
Purpose – The compressor is the heart of the cooling system. It creates the pressure difference that causes the refrigerant flow around the system. Compressor…
Once a switch or set of contactor/relay switched contacts (F ig u re SP-8-4) have been identified as the probable cause of an electrical problem…
Inductive loads include relay and contactor coils, compressor motors, and fan motors (Figure SP-8-4). They also include control transformers, solenoid valves, and some gas valves.…
Electric crankcase heaters and electric heater elements (Figure SP-8-4, Views A and B) are typical examples of resistive loads encountered in HVAC equipment. Once a…
Once the source of an electrical problem has been isolated to a malfunctioning load or control circuit (Service Procedure SP-7), the next step in the…