Cres Cor CCBC-4-35 - Manual (Page 23)

[ Section 5- Troubleshooting ] [ Page 20 ]
Cabinet has no power to controller-display not lit:
1. Make sure the power is connected to the cabinet that the cord is plugged in on the
models with power cord and plug.
2. Check main circuit breaker at power supply panel; make sure it is on.
3. Model CCBC-12-UA-100 only, has an "isolator" (disconnect) switch on the control box,
make sure it is on.
4. Check circuit breakers inside cabinet control box; make sure all are on.
Check control power supply circuit safety klixon (some models). If tripped due to
having exceeded 158°F, some models must be manually reset by pushing the red reset
button (make sure power is turned off before doing this to avoid any unexpected
injury!). Other models will reset automatically.
5. Check fuse on PC board.
6. Check for loose wiring.
7. Check plug in connectors for interconnecting cords and cables from main to front
"Touch Pad" operators panel.
8. Defective communications ribbon cable.
9. Defective main or front PCB.
Cabinet has power, display shows "OFF". Turn cabinet "on" by pressing "OFF/ON" button.
1. Compressor not running:
(a) Manually close compressor contactor (if utilized) temporarily to see if
compressor runs.
(b) If compressor runs, check compressor control circuit for problem.
(1) Is the Dual Pressure Control open?
- Check for correct settings
- Low or no refrigerant charge
- Liquid Line Solenoid Valve (if used) not opening?
(c) If the compressor doesn't run, check if you have power to compressor
terminals.
(1) If no power to terminals, trace back until power is found. Correct
problem.
- If single phase, check start relay and capacitor(s).
(2) If power is present at compressor terminals, check for stripped
compressor overload and/or "open" or grounded compressor-motor
windings.
2. Compressor does run:
(a) Compressor short cycles.
(1) Check DPC settings. Cut-in and/or differential may need to be
adjusted.
(2) Check refrigerant charge may be low.
- If low, or no charge, check for leaks, repair and recharge as
necessary.
(3) Check if thermostatic expansion valve is feeding properly.
(4) Check Chiller Store Thermostat ("St 1") and Differential ("Dt 1")
settings.
(5) Check the "fin" and "air on" thermocouples at main PCB to make sure
they are not interchanged.
(continued)