Sterlco M2B+ Controller - Manual (Page 22)

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4-2 Starting and Stopping Water TCUs
Starting the Unit (Local)
Press the Start button to begin the following sequence of events:
1. The green LED inside the Start button lights up.
2. The LCD backlight lights up.
3. The Pump Output turns on.
4. The LCD displays the setpoint value, process temperature, return temperature, and
delta temperature.
5. If the Auto Vent Cycle parameter is enabled, the Vent Output turns on, and the LCD
displays “Vent Time = mm:ss.”
6. When the Auto Vent timer expires or if the Auto Vent Cycle parameter is disabled,
the LCD displays “RUNNING,” and system control begins.
Stopping the Unit
While the system is running, press the Stop button to shut down the system. If the process
temperature is below 150ºF, the system will immediately shut down. If the current process
temperature is above 150ºF, pressing the Stop button will begin the following sequence of
events:
7. The LCD displays “SHUTDOWN [Cool Down].”
8. The setpoint changes to 150
º F.
9. The Heat Outputs will turn off.
10. The Cool Output will turn on.
11. The system waits for the process temperature to drop down to 150
º F.
Shutdown temperature is adjustable from 90 ° F to 180 ° F. See
Section 5-14 for procedure.
12. At 150 º F, the LCD displays “SHUTTING DOWN.”
13. All outputs immediately turn off.
14. The system re-cycles to the “Power Available/System OFF” state.
Pressing the Stop button a second time while the controller is in
the “SHUTDOWN [Cool Down]” mode will abort this cool down
operation and the system will immediately go into the
“SHUTTING DOWN” phase of the operation.
Starting the Unit (Remote)
REMOTE START option, the controller start sequence will be initiated by a maintained dry
contact closure on pins 5 & 6 of header J6. The controller may be turned off by two means;
open the maintained contact input or depress the controller stop button.
The controller may also be started or stopped locally by depressing the controller start button
or stop buttons.