trouble in Compressor Carrier OPENTYPE, by Adrinaus.Dalame(CV.F & A ENGINEERING)

TROUBLE / SYMPTOM	PROBABLE  CAUSE	REMEDY
Compressor will not start	Power off	Check main switch, fuse and wiring
	Thermostat set too high	Reset thermostat.
	Thermal overload switch open	Reset switch.
	Oil safety switch open	Reset switch.
	Dirty contacts.	Clean and control contacts.
	Loose electrical connections or faulty wiring	Tighten connections; check wiring and rewire.
	Compressor motor burned out.	Check and replace if defective
	Liquid line solenoid valve closed.	Check for burned-out holding coil. Replace if defective.
	Evaporator fan off.	Check fuse, overloads. Restart.
	Evaporator condenser or cooling tower fan or pump not operating.	Check fuses, overload and control. Restart.
Compressor cycles intermittenly	Low-pressure switch erratic in operation	Check for clogged tubing to switch. Check switch setting.
	Low refrigerant charge.	Add refrigerant.
	Capacity control setting incorrect.	Reset
	Thermostat differential too narrow.	Reset.
	Suction valve closed or throttled.	Open up valve.
Compressor cycles on high pressurestat.	Tubing to pressurestat restricted	Check and clean tubing.
	Faulty pressurestat.	Repair or replace.
	Refrigerant overcharge.	Remove excess refrigerant.
	Insufficient condenser water flow or  clogged condenser.	Adjust water regulating valve to condenser. Clean condenser.
	Discharge service valve not fully open.	Open valve
	Air in system.	Purge air.
	Condenser water pump off.	Check pump and start.
High discharge pressure.	Condenser inlet water temperature too high.	Increase water quantity by adjusting water regulating valve. Use colder water.
	Insufficient water flow through condenser.	Readjust water regulating valve. Increase size of water supply main to condenser.
	Plugged or scaled condenser tubes.	Clean tubes.
	Discharge service valve partially closed.	Open valve.
	Refrigerant overcharge.	Remove excess refrigerant.
	Air system.	Purge air.
By ADRY ENGINEERING
Low discharge pressure.	Excessive water flow through condenser.	Adjust water regulating valve.
	Suction service valve partially closed.	Open valve.
	Leaky compressor suction valves.	Examine valve discs and valve seats. Replace if worn.
	Worn piston rings.	Replace.
Flooding	Detective or improperly set expansion valve.	Reset to 5 F-10 F superheat. Valve operating must be stable (not hunting).
Low suction pressure	Low refrigerant charge.	Add refrigerant.
	Excessive superheat.	Reset expansion valve.
System noises	Loose or misaligned coupling.	Check alignment and tightness.
	Insufficient clearance between piston and valve plate.	Replace detective parts.
	Motor or compressor bearing worn.	Replace bearing.
	Loose or missligned belts.	Check alignment and tension. (belt slack should be at top.)
	Loose hold down bolts.	Tighten bolt.
System noise (cont)	Unit foundation improperly isolated.	Isolate foundation.
	Improper support or isolation of piping.	Use correct piping techniques and support piping with suitable hangers
	Slugging from refrigerant feeback.	Check expansion valve setting. Check thermal bulb looseness and correct location. See carrier system design manual, part 3 for standart piping techniques.
	Hydraulic knock excessive oil in circulation.	Remove excess oil. Check expansion valve for floodback.
	Defective valve lifter mechanism (noise level varies with unloading).	Replace sticking filters pins. Check unloader fork for alignment. Check power element for sticking piston. Check for oil leakage at tube connection to power element. Check amount of valve pin lift above valve seat (0.33 in. for 5F; 0,125 in for 5H.
	Piping vibration.	Support pipes are required. Check pipe connections.
	No muffler in discharge line or improperly located.	Install muffler . move muffler closer to compressor.
	Hissing (insufficient flow through expansion valves, or clogged liquid line strainer).	Add refrigerant. Clean strainer.
Compressor will not unload.	Capacity control valve not operating.	Repair.
	Unloader element sticking.	Repair.
	Hydraulic relay sticking.	Replace control cover assembly
	Plugged pressure line to power element.	Clean line.
	External adjusting stem damaged.	Replace.
Compressor will not load.	Low oil pressure (below 35 psig.)	Check oil charge, switch settings.
	Capacity control valve stuck open.	Repair or raplace.
	Unloader element sticking.	Repair.
	Plugged or broken pressure line to power element.	Clean or repair.
	External adjusting stem damaged.	Replace.
	Control oil strainer blocked.	Clean or replace.
	Control valve bellows leaking.	Remove thread protector and leak test. Replace valve body I bellows leaks.
	Pipe plug in pneumatic connections.	Remove pipe plug.
	Foaming in crankcase from refrigerant flooding.	Check expansion valve and piping.
	Hydraulic relay sticking.	Replace control cover assembly.
Rapid unloader cycling	Excessive fluctuation in suction. Pressure from oversized expansion valve.	Resize expansion valve.
	Partially plugged control oil strainer.	Clean or replace strainer.
	Low oil pressure.	See trouble/symptom – low oil pressure.
Llow oil pressure.	Low oil charge.	Add oil.
	Faulty oil charge.	Check and replace.
	Defective oil pressure regulator.	Repair or replace.
	Clogged oil suction strainer.	Clean strainer.
	Broken oil pump tang.	Replace pump assembly.
	Clogged oil line	Remove obstruction.
	Worn oil pump.	Replace pump assembly.
	Worn compressor bearings.	Replace.
Cold compressor.	Liquid carryover from evaporator.	Check refrigerant charge and expansion valves.
Low crankcase oil level.	Oil return check valve stuck closed.	Repair or replace check valve.
Cylinders and crankcase sweating.	Refrigerant floodback.	Check refrigerant charge and expansion valve.
High  crankcase temperature (should be 150 F to 160 F max. at seal housing)	Liquid line strainer clogged.	Clean strainer.
	Excessive superheat.	Reset expansion valve.
	Compression ratio to high.	Recheck design.
	Discharge temperature over 275 F	Check unit application.
	Leaking suction or discharge valves.	Replace valves.