Carrier 52S manual Basic Compressor Troubleshooting Guide

52S

SERIES

SYMPTOM	COMPRESSOR	COMPRESSOR	COMPRESSOR	COMPRESSOR	COMPRESSOR
	STARTS AND	STARTS AFTER	WILL NOT
				WILL NOT START	CYCLES OFF
	RUNS BUT	CYCLING THE	START. IT HUMS
POSSIBLE CAUSE	CYCLES ON THE	OVERLOAD	AND CYCLES ON	AND MAKES NO	(NOT ON
	OVERLOAD	SEVERAL TIMES	THE OVERLOAD	NOISE	OVERLOAD)
COILS/FILTERS DIRTY OR PLUGGED	X
AIR OR NONCONDENSABLE GASES	X	X
IN SYSTEM
SYSTEM REFRIGERANT OVERCHARGED	X				X
DISCHARGE LINE RESTRICTED	X	X
CAPILLARY TUBE OR STRAINER	X	X			X
RESTRICTED OR PLUGGED
FAN BLADE OR MOTOR DEFECTIVE	X				X
FAN BLADE OR BLOWER WHEEL STUCK	X				X
SYSTEM REFRIGERANT UNDERCHARGED	X				X
EVAPORATOR AIRFLOW RECIRCULATION					X
UNIT OVERSIZED FOR APPLICATION					X
COMPRESSOR REQUIRES START ASSIST		X	X
NO POWER TO UNIT				X
LOW VOLTAGE TO UNIT	X	X	X		X
OVERLOAD PROTECTOR OPEN				X
OVERLOAD PROTECTOR INCORRECT	X		X	X
OR DEFECTIVE
CAPACITOR INCORRECT OR DEFECTIVE	X	X	X		X
THERMOSTAT CONTACTS ARE OPEN				X
THERMOSTAT IS SET TOO HIGH OR LOW				X
SELECTOR SWITCH IS OPEN				X
OR DEFECTIVE
WIRING IS INCORRECT OR DEFECTIVE	X		X	X	X
SYSTEM PRESSURES NOT EQUALIZED		X	X		X
COMPRESSOR MOTOR OR	X	X	X	X	X
MECHANISM DEFECTIVE
COMPRESSOR GROUNDED			X

FIGURE 34 Ð BASIC COMPRESSOR TROUBLESHOOTING GUIDE

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