Appendix A
–
Manual Set Point Adjustment
Appendix A – Manual Set Point Adjustment
Although the preferred method of changing the unit setup is to use a computer connected to
the USB port, there may be cases where it is desired to change a set point in the field when
there is no computer available. The model 118 ITM has this capability by using the following
procedure:
Push and hold the MAX TEMP RESET button for 5 seconds. The unit will stop
scrolling, the FAN light will be ON and the display will show the FAN icon along
with the FAN set point
(This will also reset the MAX MEMORY).
Use the ALARM SILENCE/TEST and FANS MANUAL/AUTO buttons to step the
FAN set point UP or DOWN.
Push the MAX TEMP RESET button. It will then scroll to the next set point, the
ALARM light will be ON, and the Display will show the ALARM set point.
Use the ALARM SILENCE/TEST and FANS MANUAL/AUTO buttons to step the
ALARM set point UP or DOWN.
Push the MAX TEMP RESET button, the TRIP light will be ON and the display
will now show the TRIP set point.
Use the ALARM SILENCE/TEST and FANS MANUAL/AUTO buttons to step the
TRIP set point UP or DOWN.
Push the MAX TEMP RESET button, the RELAY 4 light will be ON and the
display will show the RELAY 4 set point.
Use the ALARM SILENCE/TEST and FANS MANUAL/AUTO buttons to step the
ALARM set point UP or DOWN.
Push the MAX TEMP RESET button, the RELAY 5 light will be ON and the
display will show the RELAY 5 set point.
Push the MAX TEMP RESET button. The display will indicate whether the
reverse thermocouple function is active (rS) or inactive (nrS). Use the ALARM
SILENCE/TEST and FANS MANUAL/AUTO buttons to toggle between rS and
nrS.
Push the MAX TEMP RESET button. The new settings are saved, and the unit
returns to normal operation.
If during the above process no button is pushed within 30 seconds, the unit returns to
normal operation.
When the set point is changed using the above technique, the switching differential is
preserved. Thus, if the original FAN set point were 190°C with a 10°C switching differential,
the FANs would come ON at 190°C and turn OFF at 180°C. If the above method is used to
change the set point to 175°C, then the FANs will turn ON at 175°C and OFF at 165°C.
