110-512 BEL/EN 
Setting the Auto Cool Temperature 
This sub-menu is displayed only on Refrigerating / Heating Circulators. It determines the bath 
temperature at which refrigeration will be activated and permits more precise control when operating at 
high temperatures as well as more rapid cool downs. For most applications, an Auto Cool set point 15°C 
above room temperature is recommended. The Auto Cool range is from 1° to 150°C. The factory default 
is 45°C. 
Conventional Refrigeration — TC-550SD and TC-650SD Refrigerating/Heating Circulators use a 
conventional refrigeration system. The refrigeration system will turn on when the bath fluid temperature 
and set point are below the Auto-Cool set point (70°C maximum). 
 
To Access: Press the 
 
until AUTOCOOL is displayed. 
To Change: Touch the arrows until the desired auto cool temperature is displayed. 
To Accept: Press 
, 
,  ,
 
or allow the LCD to return to the main operational 
display (approximately 10 seconds). 
Resetting the Factory Default Values 
To reset your Circulator to its original factory default values, proceed as follows: 
1.  Press the   key to place the unit in Standby. 
2.  Place the Power Switch / Circuit Breaker in the OFF position. 
3.  Return the Power Switch / Circuit Breaker to the ON position while pressing the 
 
key until 
“STANDBY” appears on the display. 
4.  Press the   key. 
Touch and hold up/down 
arrows to make large 
changes 
 
Touch and release to make 
minor changes