Heatcraft Refrigeration Products H-IM-79D Installation & Operation Manual page 25

Beacon II Troubleshooting Guide (continued)
PROBLEM Step ACTION ITEM
1.
2.
3.
E7 Compressor 4.
Shutdown
5.
6.
7.
8.
Diagnostics
Check wiring connection to the board
Low Pressure Safety (LPS) Tripped:
• Check for correct refrigerant type
• Check refrigerant charge
• Check LPS setting
• Check LPS wiring
• Check EEV operation (stuck?)
• Check coil for icing
• Check for correct superheat reading
• Check for correct nozzle selection
• Check for clogged EEV inlet screen
• Check line sizing
• Check LPS time delay relay setting
• Check operation of LPS
High Pressure Safety (HPS) Tripped:
• Check for system overcharge
• Check for non-condensables
• Check condenser fan motor and blade
• Check for dirty condenser coil
• Check head pressure controls
• Check fan cycling controls
• Check liquid line sizing
• Check for liquid line restrictions
• Check operation of HPS
Oil Pressure Safety (OPS) Tripped:
• Check oil level in compressor
• Check oil sump screen pickup
• Check oil pump pressure
• Check for proper piping practices
E6
• Check for low superheat (see
• Check operation of auxiliary relay (R6)
• Check OPS sensor
• Check operation of OPS
Compressor Module Tripped (when supplied):
• Check module
• Check superheat at compressor inlet
• Check compressor for overheating
• Check suction pressure (too low?)
Phase Loss Monitor (PLM) Tripped:
• Check presence of all phase legs
• Check power supply
• Check operation of PLM
Demand Cooling (when supplied):
• Check auxiliary relay
• Check demand cooling device
Check compressor relay on board
IF OK IF NOT OK
• Correct field wiring to the board
• Change setpoint to match refrigerant
• Add more refrigerant to proper charge
• Correct LPS setting
• Correct LSP wiring
• Clean or replace EEV
• Defrost coil (see
• Check/replace sensor or transducer
• Replace distributor nozzle
• Replace EEV
• Correct line sizing
• Reset to 1 minute
• Replace Low Pressure Safety Switch
• Reclaim/recover excess charge
• Remove all non-condensables
• Repair or replace motor and/or blade
• Clean condenser coil
• Adjust or replace faulty controls
• Adjust or replace faulty controls
• Correct line sizing
• Repair line or remove restrictions
• Replace HPS if necessary
• Add oil to crankcase to minimum level
• Clean or replace pickup screen
• Replace compressor oil pump
Go to • Correct piping to minimize oil logging
) next step • Correct per steps in
• Replace auxiliary relay
• Replace faulty OPS sensor
• Replace faulty OPS
• Replace faulty module
• Reduce superheat (TXV adjust, etc.)
• Correct overheating problem
• Consider crankcase pressure regulator or
• Correct power phase problem
• Correct power supply problems
• Replace faulty PLM
• Replace auxiliary relay
• Replace faulty demand cooling device
• Replace board if relay is faulty
25
E6
, step 2)
E6
other measures