Heatcraft Refrigeration Products 25000102 Symptom Cause Remedy Compressor, Does Not Run, Cycles

			Installation and Operations Manual
SERVICE DIAGNOSIS CHART
Symptom		Cause		Remedy
Compressor	1.	Motor Line open	1.	Close starter or disconnect switch
Does Not Run	2.	Fuse blown	2.	Replace fuse
	3.	Tripped overload	3.	See electrical section
	4.	Control contacts dirty or jammed in open position	4.	Repair or replace
	5.	Piston seized	5.	Remove motor-compressor head, look for broken valve
				and jammed parts
	6.	Frozen compressor or motor bearings	6.	Repair or replace
Unit Short	1.	Control differential set too close	1.	Widen differential
Cycles	2.	Discharge valve leaking	2.	Replace valve plate
	3.	Motor compressor	3.	Check for high head pressure, tight bearings, seized
				pistons, clogged air-cooled condenser
	4.	Refrigerant shortage	4.	Repair leak and recharge
	5.	Refrigerant over charge	5.	Remove some refrigerant
	6.	Cycling on high pres. cutout	6.	Check condenser / or non condensable in system
Compressor	1.	Improperly wired	1.	Check wiring against diagram
Will Not Start -	2.	Low voltage	2.
				Check main line voltage - determine location of voltage
Hums
				drop
Intermittently	3.	Relay contacts not closing	3.
				Check my operating manually. Replace relay if defective
	4.	Open circuit in start-winding	4.	Check stator leads. If leads are all right, replace stator
				Check stator. If leads are all right, replace stator
	5.	Stator winding grounded	5.
				Eliminate cause of excessive pressure
	6.	High discharge pressure	6.
				Check oil level. Correct binding
	7.	Tight compressor	7.
Unit Operates	1.	Control contacts sticking in closed position	1.	Clean points or replace control
Long Or	2.	Insufficient refrigerant in system	2.	Check for leaks. Repair and add charge
Continuously	3.	Dirty condenser	3.	Clean condenser
	4.	Air or non-condensables in system	4.	Purge high point in system
	5.	Compressor inefficient	5.	Check valves and pistons
	6.	Improper wiring	6.	Check wiring and correct if necessary
Fixture	1.	Insufficient refrigerant in system	1.	Check for leaks. Repair and add charge
Temperature	2.	Control set too high	2.	Reset control
Too High	3.	Control wiring loose	3.	Check wiring to control
	4.	Expansion valve or strainer plugged	4.	Clean or replace
	5.	Compressor inefficient	5.	Check valves and pistons
	6.	Expansion valve set too high	6.	Lower setting
	7.	Iced or dirty coil	7.	Defrost or clean coil
	8.	Unit too small	8.	Add unit or replace
	9.	Clogged or small refrigerant lines	9.	Clear line or increase line size
	10.	Oil logged in system	10.	Remove excessive oil, check refrigerant charge
High	1.	Refrigerant overcharge	1.	Remove the excess
Discharge	2.	Non-condensables in system	2.	Remove the non-condensables
Pressure	3.	Dirty condenser coil	3.	Clean
	4.	High side restriction	4.	Check all valves or remove restriction
	5.	Head pressure control setting	5.	Adjust controls
	6.	Fan not running	6.	Check electrical circuit

34 Part # 25000102