Sterlco M2B+ Controller - Manual (Page 12)

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2-5 Panel Layout and Keypad
See Figure 1 on page 15 for an illustration of the control panel and its buttons. The LCD
backlight lights up whenever any key is pressed. The backlight turns off after five minutes if
no other key activity occurs.
LED Indicator Lights
The Advanced and M2B+ controller has one LED that will light up to indicate the control
process has been started. This LED is located inside the Start button of the controller’s
front panel. When power is applied, the LED will remain off until the Start button is
pushed. The LED will then illuminate green.
LCD Display
A 4-line by 20-character liquid crystal display (LCD) will show operational status, alarms
and programming menus.
1st Line. The first line of the LCD continuously displays the ‘To Process’ temperature.
2nd Line. The second line of the LCD continuously displays the ‘Setpoint’ temperature.
3rd Line. The third line of the LCD continuously displays the ‘From Process’ temperature;
the delta temperature of the ‘To Process’ and the ‘From Process’; and the flow in GPM or
LPM, if applicable.
4th Line. The fourth line of the LCD will display all menu items used in the controller setup.
Also displayed are the status of the pump, outputs for the heater, as well as cooling and
elapsed time for the vent cycle. The fourth line will also explain all alarm conditions and
operating status.
LCD Messages
Autotuning. Appears while tuning is in process.
High Water Alarm. Appears if the option is selected and the switch is closed
Water Pressure/Low Level Alarm. Appears when the Low Water Pressure switch is open
or the optional Low Water switch is closed.
Auto Vent Indicator. Appears in the LCD display when the unit is in Auto Vent mode. The
vent time remaining will also be displayed.
Pump Rotation/Loss Indicator. Appears in the LCD display when the Pump Rotation
switch is open.
Safety Thermostat Indicator. Appears in the LCD display when the Safety Thermostat
switch is open.
‘To Process’ Sensor Open Indicator. “999” appears in the process LED displays when the
‘To Process’ probe is open.
‘From Process’ Sensor Open Indicator. “999” appears in the LCD display for return
temperature (RT) when the ‘From Process’ probe is open.
Remote Probe Sensor Open Indicator. “999” appears in the LCD display for mold
temperature (MT) when the Remote probe is open.
High Alarm Indicator. Appears in the LCD display when a High Alarm condition occurs.