Model 1700 Page 21 12/07
ROSCO MODEL 1700 PARTS IDENTIFICATION GUIDE
Main PCB: Fuse and Calibration
A. Calibration potentiometer for TEMPERATURE CONTROL
B. Calibration potentiometer for PUMP SPEED SETTING
C. Fuse 6.3 amp (240v) #23711700E003
Fuse 12.5 amp (115v) #23711700E004
D. Positive terminal for the thermocouple.
E. Negative terminal for the thermocouple.
Temperature recalibration
Adjust the potentiometer (A) while taking a voltmeter reading between terminals (D) & (E) in
millivolts. Reading should be 12.4 mv (+/-0.2mv) at the point where the heater switches off (red
LED goes out). Once this has been done recheck meter reading to confirm the setting.
WARNING- THE WHITE THERMOCOUPLE WIRE IS NEGATIVE AND THE BLACK IS
POSITIVE. IF THESE ARE ATTACHED INCORRECTLY THE HEATER WILL LOCK
ON.
Pump speed recalibration
Set the output level on the remote control to “2”. Turn on the machine and slowly turn the
potentiometer (B) until fog just begins to flow.
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