Личный кабинет

Корзина

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A/C System Service

Pressure Test Chart

TEST RESULTS	RELATED SYMPTOMS	PROBABLE CAUSE	REMEDY
Discharge (high) pressure abnormally high	After stopping compressor, pressure drops to about 196 kPa (28 psi) quick- ly, and then falls gradually	Air in system	Evacuate system: then recharge Evacuation: page 22-32 Recharging: page 22-33
	No bubbles in sight glass when con- denser is cooled by water	Excessive refrigerant in system	Discharge refrigerant as necessary
	Reduced or no air flow through con- denser	• Clogged condenser or radiator fins • Condenser or radiator fan not working properly	• Clean • Check voltage and fan rpm • Check fan direction
	Line to condenser is excessively hot	Restricted flow of refrigerant in system	• Expansion valve • Restricted lines
Discharge pressure abnormally low	Excessive bubbles in sight glass; condenser is not hot	Insufficient refrigerant in system	• Check for leak • Charge system
	High and low pressures are balanced soon after stopping compressor	• Faulty compressor discharge or inlet valve • Faulty compressor seal	Replace
	Outlet of expansion valve is not frosted, low pressure gauge indicates vacuum	• Faulty expansion valve • Moisture in system	• Replace • Flush and evacuate
Suction (low) pressure abnormally low	Excessive bubbles in sight glass: condenser is not hot	Insufficient refrigerant	Check for leaks.
	Expansion valve is not frosted and low pressure line is not cold. Low pressure gauge Indicates vacuum	• Frozen expansion valve • Faulty expansion valve	Replace expansion valve
	Discharge temperature is low and the air flow from vents is restricted	Frozen evaporator	Run the fan with compressor off then check capillary tube.
	Expansion valve frosted	Clogged expansion valve	Clean or Replace
	Receiver dryer is cool (should be warm during operation)	Clogged receiver dryer	Replace
Suction pressure abnormally high	Low pressure hose and check joint are cooler than around evaporator	• Expansion valve open too long • Loose expansion valve	Repair or Replace.
	Suction pressure is lowered when condenser is cooled by water	Excessive refrigerant in system	Discharge refrigerant as necessary
	High and low pressure are equalized as soon as the compressor is stopped and both gauges fluctuate while run- ning	• Faulty gasket • Faulty high pressure valve • Foreign particle stuck in high pressure valve	Replace compressor
Suction and discharge pressures abnormally high	Reduced air flow through condenser	• Clogged condenser or radiator fins • Condenser or radiator fan not working properly	• Clean condenser and radiator • Check voltage and fan rpm • Check fan direction
Suction and discharge pressures abnormally high	No bubbles in sight glass when con- denser is cooled by water	Excessive refrigerant in system	Evacuate and recharge _
Suction and discharge pressure abnormally low	Low pressure hose and metal end areas are cooler than evaporator	Clogged or kinked low pressure hose parts	Repair or Replace
Suction and discharge pressure abnormally low	Temperature around expansion valve is too low compared with that around receiver dryer	Clogged high pressure line	Repair or Replace
Refrigerant leaks	Compressor clutch is dirty	Compressor shaft seal leaking	Replace compressor
	Compressor bolt(s) are dirty	Leaking around bolt(s)	Tighten boltls) or replace compressor
	gasket is wet with oil _Compressor	Gasket leaking	Replace compressor
Compressor heat damage	Black soot inside compressor and hoses.	Restriction or leak in system.	Flush entire system, replace rubber lines or hoses.