Trouble

Probable Cause

COMMPRESSOR OPERATES

E. Inoperative or disconnected

CONTINUOUSLS BUT DOES

pulse-modulating expansion

NOT FORM SUFFICIENT ICE

valve (see applicable

BANK (CONT’D)

REFRIGERATION FLOW

 

DIAGRAM).

F. Inoperative control board. No output from board to solenoids.

Remedy

E.Check that expansion valve is operating by touch (should be able to feel valve pulse).Check for loose or disconnected wire to solenoid coil. If necessary, troubleshoot expansion valve with a gage set to see if it is opening. If expansion valve is not opening, suction pressure will be in a vacuum.

F.Check LED’s on control board to see if they are modulating. Check for 24V output to pulse modulating expansion valve (see WIRING DIAGRAM). If control board green LED is on and yellow LED Is flashing; but no 24V output, replace board.

NOTE: If overload protector cuts out compressor, condenser fan motor will continue to operate otherwise; troubleshooting condenser fan motor problem is same as for ‘‘COMPRESSOR DOES NOT OPERATE’’paragraph plus the following:

CONDENSER FAN MOTOR

Standard Cooling Unit with

NOT OPERATING.

Condenser Coil and Fan

 

Assembly

 

A. Jumper cord loose or

disconnected from condenser fan motor or terminals inside control box. Broken wire in cord.

A.Tighten connections or replace cord.

 

B.

Fan blade obstructed.

B.

Remove obstruction.

 

C.

Inoperative condenser fan

C.

Replace condenser fan motor.

 

 

motor.

 

 

 

Remote Condenser Coil and Fan

 

 

 

assembly.

 

 

 

A. Blown power circuit fuse.

A. Replace power circuit fuse.

 

B.

Fan blade obstructed.

B.

Remove obstruction.

 

C.

Inoperative condenser fan

C.

Replace condenser fan motor.

 

 

motor.

 

 

 

D.

Cooling unit contactor

D.

Replace Cooling Unit contactor.

 

 

inoperable.

 

 

 

 

 

 

 

AGITATOR MOTOR NOT

A.

Agitator motor propeller

A.

Remove obstruction.

OPERATING.

 

obstructed.

 

 

 

B.

Low voltage.

B. Voltage must be at least 208 volts

 

 

 

 

at compressor terminals when

 

 

 

 

compressor is trying to start

 

C.

Loose, disconnected, or

C. Tighten connections or replace

 

 

broken wiring.

 

broken wiring.

 

D.

Inoperative agitator motor.

D.

Replace agitator motor.

300381000

44

Page 49
Image 49
Cornelius 000 Commpressor Operates, Continuousls but does, Not Form Sufficient ICE, Bank CONT’D Refrigeration Flow Diagram

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