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AEC/Appllcatlon Engineering
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MANUAL puts the TDH unit in Manual Cool mode; used during filling and venting during
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startup. The switch stays in the MANUAL position until moved to AUTO.
I WARNING!
• RUN THE PUMP AT LEAST 10 SECONDS BEFORE SWITCHING TO
AUTO MODE.
• NEVER SWITCH TO AUTO MODE WHEN FILLING OR VENTING THE
UNIT, EXCEPT AS DESCRIBED IN SECTION 3-2 ON PAGE 28. THE
IMMERSION HEATER WILL BE DAMAGED IF IT IS ENERGIZED
WITH AIR IN THE HEATER TANK.
ALARM SILENCE
Silences the audible alarm.
I WARNING I
LOCATE AND CORRECT THE CAUSE OF THE ALARM
BEFORE ATTEMPTING FURTHER OPERATION OF THE TOH UNIT.
4-2
Indicator Lights
During typical operation, the Pump Forward indicator is lit constantly, while the Heater On and
Cooling Valve On indicators light on and off intermittently as the controller activates each
component.
Pump Forward
When lit, the pump operates in the normal forward operating direction.
Pump Reverse
When lit, the pump operates in the normal reverse operating direction.
Page 32
TOH True Temp"' Serles Hot 011 Temperature Control Units
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