Model 3920 ___________________________________________________________________Routine Maintenance
4 - 1
Press the down arrow key until the
2 becomes 0 (zero) as shown in Figure
3-9.
Press the Display key to return to
showing the setpoint and actual tem-
peratures. All safeguards are now
removed and the controller may be
programmed. Refer to the Watlow
publications included with this operat-
ing manual.
Reprogramming the temperature or humidity
controllers will change the factory default set-
tings and may seriously alter the performance of
the incubator and void the warranty. Contact the
Technical Services Department, 1-888-213-1790.
3.4 Air Exchange Ventilator Caps
Air exchange for the incubator is regulated through the
manually adjustable intake and exhaust ventilator caps located
on the top of the cabinet.
When viewed from the front of the incubator, the intake
cap is on the left, and the exhaust cap is on the right. The venti-
lator caps may be opened by turning counterclockwise and
closed by turning clockwise.
For optimum performance of the unit, the ventilator caps
should be closed at all times.
Figure 3-9
Section 4 - Routine Maintenance
4.1 Cleaning the Incubator
De-energize all potential sources of energy to this
unit and lockout/tagout their controls. (O.S.H.A.
Regulation, Section 1910-147.)
The continued cleanliness of the stainless steel used in our
products has a direct effect on the appearance and operation of
the unit. Use the mildest cleaning procedure that will do the job
effectively. Clean the outside of the incubator with soap and
water or with any non-abrasive commercial spray cleaner.
Clean the inside of the chamber with alcohol and/or soap and
water. Disinfect the interior panels with a general use laboratory
disinfectant, diluted according to the manufacturer’s instruc-
tions. rinse the surface thoroughly after each cleaning and wipe
the surfaces dry. Always rub in the direction of the finish pol-
ish lines.
Do not use chlorinated solvents on stainless steel
as they can cause rusting and pitting.
Do not use volatile or aromatic solvents for clean-
ing inside the cabinet as their residue can contam-
inate the cabinet environment.
The Thermopane glass door may be cleaned with commer-
cial glass cleaner or with a solution of ammonia and water.
