Cornelius 322 manual Circuit Board Diagnosis, Transformer

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