The defrost timer is located on the lower right side panel of the shaker
cabinet to the right of refrigeration power switch and is engaged whenever
the refrigeration system is turned on.
1. Refrigeration Power Switch - Activates refrigeration system, I is ON, O
is OFF.
2. Defrost Time Power Status Lamp (Power) - Timer is powered along
with refrigeration system whenever green power status lamp is lit.
3. Defrost Status Lamp (Defrost) - Cooling coil is being defrosted
whenever yellow defrost status lamp is ON. Hot gas is being bypassed
through the iced coil. When ice on the coil has melted, defrost cycle
ends automatically.
4. Fan Delay Status Lamp (Fans) - During defrost timer power-up and
after defrost cycle, the circulating fan is locked off for a 1½ minute
delay. Green fan status lamp flashes during this fan delay period.
Incubated and Refrigerated Shakers 5-11
Thermo Scientific
Section 5
Operation
Defrost Timer
Figure 5-4.
Defrost Timer
