Instruction manual

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(For special order units with the following controller.)
Operation of the Watlow 942 and 945 Control Instrument
This is intended as a quick reference guide and should not be substituted for reading the
product manual! The purpose of this sheet is to get the furnace up and running quickly and simplify
operation in the beginning.
Your new furnace was tested at the factory prior to shipping and the instrument(s) were tuned for
optimum performance. There should be no need for further adjustment in the field. It is also locked out on
several levels to prevent unauthorized changes. If you have any problems, CALL MIFCO FIRST!
NOTE: This lockout is installed for your protection. If you feel the need to change the factory
parameters, call MIFCO first! We will discuss your needs and help you through the process. If you
change the parameters on your own and run into problems, you will be charged a fee of $20.00 to
troubleshoot the problem over the phone. Troubleshooting for unauthorized tampering will not begin
until we have a VISA or MASTERCARD number.
OPERATION
To start the furnace, press the start button or flip the toggle switch to on. The instrument will power
up automatically and display the process temperature in the upper display and the setpoint in the lower
display. To change the setpoint, press the UP or DOWN buttons and hold until the desired setpoint is
reached. (The longer the button is held, the faster the numbers will change.) The furnace will operate
automatically from that point on.
If your furnace has a High Limit instrument, please refer to the next page for operating instructions.