CIRCUIT BOARD DIAGNOSIS

Turn the power switch OFF, and center position. Disconnect the proximity switches and thermistors from the circuit board. Remove a sleeve jumper from the options terminal and place it on terminals 4 and 5 of the test plug. Turn the power switch to the “ON”position and remove the sleeve jumper from terminals 4 and 5. The LED indicators will cycle “on”for approximately 2 seconds each in the following sequence.

1. Red D-5 (error)*

*Will only cycle if ice thickness (pot) is within factory setting

2.

Green

D-6

(condenser fan)

3.

Green

D-11(hot gas valve)

4.

Green

D-12

(water pump)

5.

Green

D-14

(relay-contractor)

6.

Green

D-15

(dump valve)

Failure of the LED’s to cycle in this sequence will signal a defective circuit board.

Options Plug

Sleeve Connector

Dump

Dump

Dump

Dump

Every

Every

Every

Every

Cycle

3rd

5th

7th

 

Cycle

Cycle

Cycle

 

D-13

D-15

Water

 

 

 

 

 

Dump

 

 

 

 

 

 

Valve

 

 

 

RH Evap. Switch

YL

 

 

 

 

 

 

 

D-14

Contactor

7

8

 

 

RH Evap.

 

 

 

 

 

 

 

 

 

 

Water

5

6

 

 

YL

 

3

 

 

LH Evap. Switch

 

Pump

4

 

D-10

D-12

 

2

 

 

1

 

 

 

 

 

LH Evap.

 

 

 

 

 

 

 

 

Condenser Sensor

 

 

Hot Gas

 

 

Condenser

GR

 

 

 

White

D-11

 

 

 

plug

 

 

 

230v

 

 

 

 

Suction Line Sensor

Suction plug

 

 

Voltage

 

Brown

Fan

 

neutral

 

 

D-6

 

Selector

 

 

 

 

 

Test

 

 

Switch

115v

 

 

GR

 

 

 

Plug

RD

 

 

 

 

 

 

 

 

D-5

 

 

 

 

Options

Error

 

 

 

 

 

 

 

 

 

 

 

Plug

Adjustable Ice

 

 

 

 

 

Thickness Pot.

Transformer

 

 

 

 

 

 

 

 

 

Micro Processor

 

 

 

 

 

Stacking

 

 

 

 

 

 

Cable

 

Manual

 

 

 

 

Plug

 

 

 

 

To Stacked

 

 

Harvest

 

 

 

Unit

 

 

Switch

 

 

 

(if required)

 

 

 

 

 

 

166240008

18

3/17/95

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Cornelius 322 manual Circuit Board Diagnosis

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