Manitowoc QD0422A Especificaciones descargar pdf (Pagina 97)

Part Number STH044 10/13 89

DIAGNOSING START COMPONENTS

If the compressor attempts to start, or hums and trips

the overload protector, check the start components

before replacing the compressor.

Capacitor

Visual evidence of capacitor failure can include a

bulged terminal end or a ruptured membrane. Do not

assume a capacitor is good if no visual evidence is

present. A good test is to install a known good

substitute capacitor. Use a capacitor tester when

checking a suspect capacitor. Clip the bleed resistor

off the capacitor terminals before testing.

Relay

The relay has a set of contacts that connect and

disconnect the start capacitor from the compressor

start winding. The contacts on the relay are normally

closed (start capacitor in series with the start winding).

The relay senses the voltage generated by the start

winding and opens the contacts as the compressor

motor starts. The contacts remain open until the

compressor is de-energized.

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Manitowoc QD0422A Especificaciones Pagina 97