Setting up the oven, Operation (continued) – Shellab SMO5HP-2 User Manual

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P a g e

OPERATION (CONTINUED)

Airflow and Applications

During normal operations an internal blower fan motor pulls air in through the intake vent. The
captured air is blown across heating elements and then forced down through a duct on the right
side of the oven chamber. Upon leaving the duct, the heated air blows horizontally across the shelf
space, helping to create temperature uniformity and enhance drying. After crossing the shelves, the
air enters a duct on the left side of the chamber, and is then pulled back into the heater space
above the oven chamber. During each minute of operation some air exits through the open exhaust
vent on the top right of the unit. Lost air is replaced through the intake vent. The rate of atmosphere
exchange on several variable factors. These include: ambient conditions, position of the vent
valves, the volume of material in the oven chamber, and if a power exhaust unit is connected to the
exhaust vent.

Over Temperature Limit

The Watlow controller contains a backup temperature control system with independent circuitry
connected to a redundant temperature sensor probe inside the oven chamber. To set up this
system for use, the user enters an over temperature limit into the Watlow controller

— typically 5°C

above the application or process temperature set point. In the event the oven temperature exceeds
the over temperature limit, the backup system will depower the heating element. This provides
redundant heating control the event of a failure of the primary circuitry or the main temperature
sensor probe.

Power Exhaust Outlet

SMO5HP-2 Ovens come provided with a power outlet that can be used to power an exhaust blower
unit

attached to the oven’s exhaust vent. The power outlet and attached fan can be activated by the

Watlow controller as part of a heating profile. The primary application of the power exhaust fan is to
channel or positively vent exhaust out of the workspace around the oven.

ETTING UP THE

VEN

1. After the oven has been installed in the location where it will be used, open the

oven’s intake and the exhaust vents.

2. Push the Power Switch to the ON position. The Temperature Display will illuminate.

3. Set up the oven for use by carrying out the following procedures found in this

manual’s Operation section:

Set the Over Temperature Limit

(pg. 16)

Set the Temperature Controller Set Point

(pg. 16)

First Use Burn-In