Nor-Lake General Lab Incubator - Manual (Page 4)

- 4 - 02/12 Rev. B 138691
PERIODIC CLEANING
Disconnect power source before servicing or cleaning.
Beginning with the initial installation, the interior surfaces of the cabinet should be periodically cleaned
with a solution of warm water and baking soda. This solution will remove any odors from spillage that
has occurred. The exterior of the cabinet should also be cleaned frequently with a commercial grade of
glass cleaner. Caution: Do not use an abrasive or alkaline solution.
TROUBLESHOOTING
Problems encountered with any constant temperature cabinet are most frequently related to
temperature control. Before proceeding with detailed troubleshooting in accordance with the
Maintenance Service and Analysis Guide, ensure that the Low Limit and High Limit controls are properly
adjusted. If the limit controls are set too close or beyond the operating temperature, the Incubator may
constantly go into the alarm mode. This will result in erratic temperature control. If it is ascertained that
refrigeration service is required, contact a qualified service person. WARNING - Service should be
performed only by qualified service personnel. Line voltage and moving parts are present in the
control and machine compartments that are hazardous to life.
MAINTENANCE SERVICE AND ANALYSIS GUIDE
REFRIGERATION SYSTEM
MALFUNCTION POSSIBLE CAUSE SOLUTION
Compressor will not start - 1. Service cord unplugged 1. Plug in service cord
no hum 2. Fuse blown or removed 2. Replace fuse
3. Overload tripped 3. Determine reasons and correct
Compressor will not start - 1. Low voltage to unit 1. Determine reason and correct
hums but trips on overload 2. Relay failing to close 2. Determine reason, correct or replace
protector
Compressor starts and runs,
1. Low voltage to unit 1. Determine reason and correct
but short cycles on overload 2. Overload defective 2. Check current, replace overload protector
protector
Relay not operational 1. Voltage too high or too low 1. Determine reason and correct
Refrigerated space too warm 1. Control setting too high 1. Reset control
2. Evaporator coil iced 2. Determine reason and defrost
3. Air flow to condenser or 3. Remove obstruction for free air flow
evaporator blocked
Standard temperature system 1. Control setting is too low 1. Reset the control
freezes the product
Objectionable noise 1. Fan blade hitting fan shroud 1. Reform or cut away small section of shroud
2. Vibrating fan blade 2. Replace fan blade
Failure to Heat
1. Incorrect Control setting 1. See Control manual