Heatcraft Refrigeration Products H-IM-79E manual Master Slave Out

Diagnostics

Beacon II Troubleshooting Guide (continued)

PROBLEM	Step	ACTION ITEM	IF OK	IF NOT OK
E9 Multi-out to Multi-in	1.	Check for 24 volts power to the board		1.	If no voltage, see “LED is not lit” above
Communication Wiring	2.	Check for crossed communication wiring	Go to	2.	for low voltage, see “88888 LED display”
(only shows after initial					Correct wiring from “Master” unit Multi-out
successful connection)		(multi-out not wired to multi-in terminals)	next step		to Multi-in of “Slave” unit, etc. to all Slaves
	3.	Check for broken communication wiring		3.	and return to Master. (See wiring diagrams)
					Correct wiring between first Slave with
					error to previous board in the sequence.

(E9 continued) Communication Error Occurrence:

Break in the designated lines will cause errors as follows:

Master			Slave 1				Slave 2			Slave 3
in	out		in	out			in	out		in	out
		1				2			3
					4

Line # Master

1E9

2E9

3E9

4E9

Slave1

E9

no error no error no error

Beacon II Smart

Controller

in out

Master

in out

Slave 2

E9

E9

no error no error

Slave 1

in out

Slave 2

in out

Slave 3

E9

E9

E9

no error

Slave 3

in out

[With Beacon II Smart Controller]

Line # SMART

1+COMM+

2+COMM+

3+COMM+

4+COMM+

5 +COMM+

1 2

5

Master	Slave1
E9	no error
no error	E9
no error	no error
no error	no error
no error	no error

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Slave 2	Slave 3
no error	no error
E9	E9
E9	E9
no error	E9
no error	no error

PROBLEM	Step		ACTION ITEM	IF OK	IF NOT OK
888 LED display
		1.	Check Voltage to Evaporator Transformer		1.	Check field wiring for breaks or shorts
(power is below 18V and		2.	Check Transformer Secondary Output Volts	Go to	2.	Replace if necessary
appears at initial power)		3.	Check Voltage at Control Board (24 and C)	next step	3.	Check factory wiring and connections
		4.	Check Voltage at Beacon II Smart Controller		4.	Check field wiring from board
LED displays dLy	1.	Check for low voltage		1.	Check all steps for “888 LED display”
				Go to		Voltage could drop off too fast to show.
then oFF with no		2.	Check for short in field wiring from “comp” on	next step.	2.	Check internal factory wiring to
displayed errors			board to condensing unit terminal connection			compressor contactor.
		3.	Replace defective contactor (holding coil)

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