U-Line 2115WC, 2275DWRWS, CO2175F Refrigeration System Diagnosis Guide, Type 1 Black, Type 2 White

Section 2 - Troubleshooting

REFRIGERATION SYSTEM DIAGNOSIS GUIDE

System	Suction	Suction	Compressor	Condenser	Capillary	Evaporator	Wattage
Condition	Pressure	Line	Discharge		Tube
Normal	Normal	Slightly below	Very hot	Very hot	Warm	Cold	Normal
		room
		temperature
Overcharge	Higher than	Very cold may	Slightly warm	Hot to warm	Cool	Cold	Higher than
	normal	frost heavily	to hot				normal
Undercharge	Lower than	Warm-near	Hot	Warm	Warm	Extremely	Lower than
	normal	room				cold near	normal
		temperature				inlet - Outlet
						below room
						temperature
Partial	Somewhat	Warm - near	Very hot	Top passes	Room	Extremely	Lower than
Restriction	lower than	room		warm - Lower	temperature	cold near	normal
	normal	temperature		passes cool	(cool) or	inlet - Outlet
	vacuum			(near room	colder	below room
				temperature)		temperature
				due to liquid		backing up
Complete	In deep	Room	Room	Room	Room	No	Lower than
Restriction	vacuum	temperature	temperature	temperature	temperature	refrigeration	normal
		(cool)	(cool)	(cool)	(cool)
No Gas	0 PSIG to 25”	Room	Cool to hot	Room	Room	No	Lower than
		temperature		temperature	temperature	refrigeration	normal
		(cool)		(cool)	(cool)

THERMISTOR TYPES

Type 1 (Black)

Resistance at 77°F = 10,000 Ohms ± 5%.

Operating range is 185,000 to 650 Ohms. Resistance goes down as temperature increases. Type 1 does not need to be calibrated and can be changed without changing other wires or board.

Type 2 (White)

Resistance at 77°F = 5,000 Ohms ± 5%.

Operating range is 180,000 to 550 Ohms. Resistance goes down as temperature increases. Type 2 does not need to be calibrated and can be changed without changing other wires or board.

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