Mueller PMC 40/50 - Locking and Unlocking the Temperature Controller; Changing the Setpoint on the Temperature Controller; Changing the Calibration Offset on the Temperature Controller

Mueller Bakery Chiller, Models PMC 40/50 and PMC 70/120 Effective February 23, 1999
Installation and Operation Manual, Part No. 9842311 Revised October 17, 2019
4.3 LOCKING AND UNLOCKING THE TEMPERATURE CONTROLLER
1. Press and hold the “SEL” key for five seconds until “AL1” is displayed. Press the “” down key once to display
“LoC.”
2. Press the “SEL” key once again to display the locking code (“0” for unlocked and “4” for locked).
3. Press the “” up key or the “” down key until either “0” for unlocked or “4” for locked is displayed.
NOTE: Any number between “0” and “5” may be entered, but only “0” and “4” are active.
4. Press the “SEL” key to save the change made. The controller will once again display “LoC.”
5. Press and hold the “SEL” key for five seconds until the setpoint value is displayed, indicated by a small “SV”
illuminating in the upper left corner of the controller.
6. Press the “SEL” key to display the current tank temperature.
NOTE: If the “SEL” key is not pressed within approximately 25 seconds, the controller will time out and return
to the current temperature, storing the new setpoint or any changes made.
4.4 CHANGING THE SETPOINT ON THE TEMPERATURE CONTROLLER
1. Unlock the controller as in Section 4.3.
2. Press the “SEL” once to display the setpoint. This is indicated by a small “SV” illuminating in the upper left
corner of the controller.
3. Press the “” up key or the “” down key until the desired setpoint is displayed.
4. Press the “SEL” key to save the change made and to display the current tank temperature.
NOTE: If the “SEL” key is not pressed within approximately 25 seconds, the controller will time out and return
to the current temperature, storing the new setpoint or any changes made.
4.5 CHANGING THE CALIBRATION OFFSET ON THE TEMPERATURE CONTROLLER
1. Unlock the controller as in Section 4.3.
2. Press and hold the “SEL” key for seven seconds until “P-F” is displayed.
3. Press the “” down key once to display “PUOF.”
4. Press the “SEL” key once to display the calibration offset.
5. Press the “” up key or the “” down key to adjust the calibration offset to the amount of offset required to
match the actual water temperature. The calibration offset can be used to set the actual temperature display
should it not be the same as the water temperature in the storage tank.
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