Scotsman F0522 Manuel de service télécharger pdf (Page 41)

Service Diagnosis - Refrigeration System Failure

September 2009

Page 41

N0422, F0522, N0622, F0822, N0922, F1222, N1322, F1522

Air, Water or Remote Service Manual

Symptom Probable Cause Possible Correction

Compressor is not operating

Contactor not pulled in

Check voltage to coil of contactor, if

correct, check coil of contactor

Check if Low or High pressure cut

outs open, Code 4 in code display

Check if remote pump down switch

not closed - if open, check low side

pressure and liquid line valve

Check for control board relay not

supplying power to contactor

Compressor overheated

Check for low refrigerant charge

Check for high TXV superheat

Check for high amp draw, possible

start relay keeping start winding

powered

Compressor overload open

Check for overheating, or over amp

draw

Compressor will not start

Check start relay and start capacitor

Check voltage at compressor

Check voltage at contactor

Check compressor windings

Compressor on, no refrigeration

Low charge Check system charge

Condenser dirty Check condenser

Remote - liquid line valve restricted Check liquid line valve

TXV not metering Check superheat

Auger not turning Check gear reducer

Remote headmaster in bypass

mode

Check headmaster

Inefficient compressor

Check compressor amp draw, if

normal not likely inefficient

Compressor internal relief open

Check suction and discharge

pressure. Relief valve opens at a

pressure differential between 450

and 550 and will not re-close until

differential between suction and

discharge is reduced to less than

450.

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Scotsman F0522 Manuel de service Page 41

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