Thermo Scientific 3960, Operating And Maintenance Manual

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5-2 29 cu ft Environmental Chamber Thermo Scientific
Section 5
Maintenance
Some precautions in the cleaning and care of the incubator glass doors:
Moisture leaches alkaline materials (sodium, Na) from the surface of the
glass. Evaporation of the moisture concentrates the alkaline and may
produce a white staining or clouding of the glass surface. Cleaning
chemicals with a pH above 9 accelerate the corrosion process. Therefore, it
is very important to rinse and dry the glass doors after cleaning.
Caution There is no simple method for repairing corroded glass. In most
cases, the glass must be replaced.
s
Warning De-energize all potential sources of energy to this unit and
lockout/tagout the controls. (O.S.H.A. Regulation, Section 1910-147.)
s
Warning High voltage is present behind control panel. The remote
overtemp alarm system should be installed only by qualified electrical
service personnel.
s
There are only two replaceable fuses in the incubator. See Table 5-1 for
fuse specifications.
1. Turn off the incubator’s power switch and unplug the power cord.
2. Remove the top of the unit to access the fuses.
3. Refer to Figure 5-1 for the location of the two fuses.
4. Install the top cover and return the unit to service. If the fuse(s) blow
after restoring power to the incubator, contact the Technical Services
Department.
Clean the Glass
Doors (continued)
Replace the Power
Fuses
Forma
Fuse 1 amp ( .5 amp 3961)
Fuse 2.5 amp (1.5 amp 3961)
Analog Board
RS 485 Connection
Alarm Contacts
Blower Motor
CO Sensor
2
Micro Board
Power Supply
Figure 5-1. Fuse Locations