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D. Settings and Diagnostics
Various settings and diagnostic information can be controlled via the display panel. The
display panel is located behind the front panel. To open the front panel, grip the outer
edge of the panel near the top and bottom and pull it open. This permits access to the
display panel and control box. The unit has a minute startup delay. To bypass the
startup delay, move the power switch to the "OFF" position. Then press and hold the up
arrow key while moving the power switch to the "ON" position. Follow the instructions
and warnings below and on the display panel for safe and efcient operation of the unit.
1. Gaining Access to Settings and Diagnostics
Generally, the only two settings that can change are the temperature display scale
(°F or °C) and the temperature setpoint. The restriction to these two settings is achieved
by the presence of a jumper between connector K151 pins 7 and 8 on the control board.
To access other settings, the jumper must be removed. To see if the jumper is present
press and hold both the button and the unmarked, blank button for 5 seconds. If
"F5" appears in the display window, the jumper is present and must be removed in order
to access other settings. If "F0" is displayed, no jumper is present and all settings are
unrestricted and accessible. See the rest of this section for details about each setting.
Note: If there is no input for 60 seconds, the display will revert to normal.