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Vacuum Gauge: Measures the vacuum level in the oven form 0 – 30” of vacuum.
6.0 HOW TO RUN THE OVEN
The following instructions are for single set point operations only. The Watlow 981 controller has 4 automatic
settable profiles with six steps within each profile. For programming and set-up instructions turn to Chapter 7
(page 7.1) in the Watlow manual supplied with your oven.
Set Point Operation: After the oven has been inspected and the proper power connection has been made,
follow the instructions below:
1. Flip the power switch (located at the left of the instrument panel) It should glow with a green
light if it is connected to the power correctly.
2. The Process (upper window on your Watlow 981controller) will display the current chamber
temperature.
3. The lower window of your controller will indicate the current temperature set point.
4. To increase the set point, press the up arrow key until the desired set point is displayed in
the lower controller window.
5. To decrease the set point, press the down arrow key until the desired set point is displayed
in the lower controller window.
6. The oven will heat to your selected set point and remain there until changed. Note: The set
point will not change even if the power is turned on and off.
Using the exhaust damper: If you want moderate ventilation in the oven, open the vent on top. The slide
damper controls volume of ventilation. Maximum flow will slightly increase heat up and recovery time.
7.0 PREVENTIVE MAINTENANCE
Disconnect the oven before servicing it.
A. Remove the shelves. Clean the oven interior and shelves whenever they get stained or dirty.
B. Inspect the door gasket, making sure it is in good condition, and that the door seals snugly against
its mullion.
C. Level the oven, using its adjustable feet.
D. If you suspect that air flow across the work space has decreased, have the blower wheel cleaned. It
is possible for the blower to get dirty if the oven is used with dirty, lint-laden loads.
E. Run the oven at some usual temperature. Stabilize. Turn the overtemperature safety thermostat to a
temperature lower than that on the main temperature controller. Make sure the overtemperature
light comes on, and that oven temperature falls.