oven an optimum temperature. The diagonal shelf design accommodates 50 lb. electrode containers
eliminating the need to remove rods from the containers. The diagonal shelf design compartments also
allow air to circulate freely throughout the oven.
Guide to Storage
See the enclosed guide to storage. This guide may be used in the absence of storage information
from the electrode manufacturer. In critical situations, contact your electrode manufacturer.
Scheduled Maintenance
The manufacturer recommends that unit be unloaded and cleaned of debris and dust every six
months. It is also recommended that a temperature probe be placed inside the unit next to the
thermocouple, and the controller calibration checked at this time.
Troubleshooting: The Keen oven model KHT-900 requires a minimal amount of
electrical knowledge to repair if necessary.
IF OVEN FAILS TO OPERATE – NO HEAT
1. Check power source.
2. Check power cord continuity. Replace cord assembly if faulty.
3. Check over temperature controller’s set point and reset button.
4. Check output side of fuse block for proper voltage. If fuses are bad, inspect oven wiring and
components for damage. Replace fuses.
5.
Check input and output voltages on over temperature and temperature controller for proper
voltage. If input voltage is not present, check wiring. If input voltage is present and there is no
output voltage, replace or repair controller.
6.
If output voltage is present, check for voltage at contactor coil controlled by over temperature
controller. If voltage is not present, check wiring. If voltage is present at coil and contactor is in
the open position, replace contactor. If the contactor is in the closed position and there is no
output voltage present, replace contactor.
7.
If the over temperature contactor is functioning, next check the relay operated by the temperature
controller for proper control voltage and proper load voltage on the input and output sides of the
relay.
8.
If there is no control voltage present at the relay, check wiring to the temperature controller and
temperature controller output voltage.
9.
If control voltage is present at relay, check voltage between relay output and common. If no
voltage is present between relay output and common, replace relay.
10.
If voltage is present between relay output and common, check wiring to elements, and element
continuity. Replace faulty wiring or elements.
IF OVEN FAILS TO REACH SET POINT
One or more elements may be faulty. Check continuity and replace faulty elements.
(6 pages)
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