Heatcraft Refrigeration Products H-IM-79E manual Or other measures

Diagnostics

Beacon II Troubleshooting Guide (continued)

PROBLEM			Step	ACTION ITEM	IF OK	IF NOT OK
			1.	Check wiring connection to the board		• Correct field wiring to the board
	2.			Low Pressure Safety (LPS) Tripped:
				• Check for correct refrigerant type		• Change setpoint to match refrigerant
				• Check refrigerant charge		• Add more refrigerant to proper charge
				• Check LPS setting		• Correct LPS setting
				• Check LPS wiring		• Correct LSP wiring
				• Check EEV operation (stuck?)		• Clean or replace EEV
				• Check coil for icing		• Defrost coil (see E6, step 2)
				• Check for correct superheat reading		• Check/replace sensor or transducer
				• Check for correct nozzle selection		• Replace distributor nozzle
				• Check for clogged EEV inlet screen		• Replace EEV
				• Check line sizing		• Correct line sizing
				• Check LPS time delay relay setting		• Reset to 1 minute
				• Check operation of LPS		• Replace Low Pressure Safety Switch
	3.			High Pressure Safety (HPS) Tripped:
				• Check for system overcharge		• Reclaim/recover excess charge
				• Check for non-condensables		• Remove all non-condensables
				• Check condenser fan motor and blade		• Repair or replace motor and/or blade
				• Check for dirty condenser coil		• Clean condenser coil
				• Check head pressure controls		• Adjust or replace faulty controls
				• Check fan cycling controls		• Adjust or replace faulty controls
				• Check liquid line sizing		• Correct line sizing
				• Check for liquid line restrictions		• Repair line or remove restrictions
				• Check operation of HPS		• Replace HPS if necessary
E7 Compressor		4.		Oil Pressure Safety (OPS) Tripped:
Shutdown				• Check oil level in compressor		• Add oil to crankcase to minimum level
				• Check oil sump screen pickup		• Clean or replace pickup screen
				• Check oil pump pressure		• Replace compressor oil pump
				• Check for proper piping practices	Go to	• Correct piping to minimize oil logging
				• Check for low superheat (see E6)	next step	• Correct per steps in E6
				• Check operation of auxiliary relay (R6)		• Replace auxiliary relay
				• Check OPS sensor		• Replace faulty OPS sensor
				• Check operation of OPS		• Replace faulty OPS

5.Compressor Module Tripped (when supplied):

• Check module	• Replace faulty module
• Check superheat at compressor inlet	• Reduce superheat (TXV adjust, etc.)
• Check compressor for overheating	• Correct overheating problem
• Check suction pressure (too low?)	• Consider crankcase pressure regulator
	or other measures

6.Phase Loss Monitor (PLM) Tripped:

• Check presence of all phase legs	• Correct power phase problem
• Check power supply	• Correct power supply problems
• Check operation of PLM	• Replace faulty PLM

7.Demand Cooling (when supplied):

	• Check auxiliary relay	• Replace auxiliary relay
	• Check demand cooling device	• Replace faulty demand cooling device
8.
	Check compressor relay on board	• Replace board if relay is faulty

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