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
4.1 POWER ON SEQUENCE OF OPERATION
A. When the push button is in the OFF (out) position:
1. Power is supplied to the temperature controller and a temperature is displayed. Setpoints may be changed
any time power is supplied to the temperature controller. The temperature displayed may not be a true
reading of tank temperature if the circulation pump is not running.
2. All other functions of the bakery chiller are disabled.
B. When the push button is in the ON (recessed) position:
1. Power is supplied to the temperature controller and a temperature is displayed. Setpoints may be changed
any time power is supplied to the temperature controller. The temperature displayed may not be a true
reading of tank temperature if the circulation pump is not running.
2. The system light at the center of the ON/OFF button is on.
3. The fill solenoid will allow the water storage tank to fill until the level switch stops the fill near the top of
the water storage tank.
4. The circulation pump is on. Any time the tank is empty, or on initial start up, the operator must disable the
circulation pump. This will allow the fill solenoid to fill the tank and prevent the pump from running dry.
Refer to Section 3.1, “First Time Startup,” for detailed information.
5. Water will flow through the chiller recirculation loop piping and solenoid to the top of the tank.
6. The condensing unit will operate if the water temperature is above the setpoint.
7. When a batch is drawn, the flow through the process piping increases and will open the process flow
switch contacts, disabling the fill solenoid and condensing unit, and closing the recirculation solenoid.
8. When the batch draw is complete, the process flow switch contacts close and the fill solenoid will refill the
water storage tank. When the water storage tank is full, the temperature controller again has control of the
condensing unit.
4.2 ERROR MESSAGES
A display reading of “uuuu” is a designation of a disconnected or broken temperature sensor wire. Should this
occur, service is required to correct the problem.
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Section 4.0 – Programming and Troubleshooting
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