[ Section 5- Troubleshooting ]
[ Page 21 ]
3. Compressor runs continuously.
(1) Check compressor for "pumping" efficiency.
(2) Door not closed tight or gasket leaking.
(3) If no DPC, or if DPC set too low to open, check refrigerant charge
and/or thermostatic expansion valve for adequate feeding.
Cabinet has power, display shows "Sto", but load of hot food takes extremely long to chill:
1.
"Sto"
is the storage mode and cannot chill food properly. You must first choose a
"PROGRAM" and then press "BLAST" in order to make the machine do a blast chill
cycle to quickly chill hot food.
In "BLAST" mode, unit runs, but doesn't chill the food fast enough.
1. Food too "thick" - limit 2 inches maximum for optimum performance.
2. Food too hot when placed inside - temperatures above 160°F increase pull-down time
proportionally.
3. Too much food - exceeding rated pounds of capacity increases pull-down time
proportionally.
4. Food covered (air trapped between food and cover is and insulator).
5. Container too large (distance from outside of container to center of food within is too
great, shouldn’t exceed 2 inches for optimum performance).
6. Container material is plastic (an insulator) instead of metal (a conductor).
7. If cabinet was off did not pre-chill before loading with hot food.
8. If using timed program, incorrect amount of time being selected.
9. Mechanical problem:
(a) Inadequate refrigerant charge.
(b) Thermostatic Expansion Valve defective.
(c) Evaporator fan(s) not working.
(d) Evaporator coil iced (see below for possible causes).
(e) Inadequate refrigeration (BTUH) capacity:
- Condensing unit ambient, or too high
- Condenser fan not working (if air cooled)
- Condenser
dirty
- Compressor inefficient (or defective)
- Refrigerant
line
restriction
Evaporator coil iced:
1. Check how cabinet is being operated:
(a) Placing load of hot food inside and merely closing door is
improper use.
Doing this keeps unit in the storage ("Sto") mode resulting in extremely long
pull-down times and does not initiate an automatic defrost. As a result the
evaporator coil becomes heavily iced.
(b) Must run a "BLAST" cycle for automatic defrosting to occur.
(continued)
