Heatcraft Refrigeration Products BEACON II H-IM-79E Installation And Operation Manual page 27

Beacon II Troubleshooting Guide (continued)
PROBLEM Step
1.
2.
3.
4.
5.
Cannot get to box
6.
temperature
7.
8.
9.
10. Check condenser for non-condensables
11. Check condenser fan operation
12. Check for correct refrigerant type
13. Check for iced evaporator coil
14. Check defrost parameters
15. Check superheat setpoint (too high?)
16. Check display values (°F or °C)
1.
2.
3.
Service Mode
(SEr is displayed)
1.
2.
3.
Diagnostics
ACTION ITEM
Check system operation: Is it running?
Check system charge
Check for proper operating superheat
Check for high superheat and EEV wide open
Check Low Pressure Safety Switch
Compare equipment capacity with requirements
Check box temperature setpoint
Check compressor performance
Check condenser coil for dirt/debris
Placing system into SERVICE MODE
(BOARDS ONLY)
Use Remote Service Switch in condensing unit
Pressing "Force Service" button board* twice
Connection between "Ser" and "C" on board*
(all are wired in parallel; all will activate mode)
*ONLY Master board on multiple evaporator systems
(with Beacon II Smart Controller)
Use Remote Service Switch in condensing unit
Connection between "Ser" and "C" on board*
From program menu of Beacon II Smart Controller,
Change SERVICE setpoint to "On".
[all are wired in parallel; any/all will activate mode.]
*ONLY Master board on multiple evaporator systems
IF OK IF NOT OK
1. Check power to condensing unit
Check position of Service Mode switches
Check compressor overloads and contactor
2. Add or remove refrigerant to proper charge
3. Check EEV operation
Check control board EEV signal
Check suction sensor and transducer
4. Check EEV inlet screen and restrictions
Check liquid line sizing
Check head pressure controls
5. Check everything for E7 LPS above
Go to 6. Add or replace with more/larger equipment
next step 7. Correct setpoint to proper value
8. Check compressor application limitations
Check integrity of compressor operation
(impaired, worn or damaged components)
9. Clean condenser coil
10. Remove all non-condensables
11. Replace/repair fan blade, motor, cycling
switch or make corrective adjustments.
12. Compare board setpoint and refrigerant
13. Defrost coil and check defrost cycle (see E2)
settings/setpoints and defrost sensor
14. Correct defrost setpoints in program
(frequency and termination of defrosts)
15. Correct setpoint for more cooling surface
16. Correct setpoint for proper display values
Terminating SERVICE MODE
(BOARDS ONLY)
1. Must terminate using same switch
2. Press "Clear" button on board
3. Open connection between "Ser" and "C"
(Note: If multiple switches were placed in Service
Mode, all must be "open" to terminate the mode.)
(with Beacon II Smart Controller)
1. Must terminate using same switch
2. Open connection between "Ser" and "C"
3. From program menu of Beacon II Smart Controller,
Change SERVICE setpoint to "Off"
[Note: If multiple switches were placed in Service
Mode, all must be "open" to terminate the mode.)
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