IPS Controllers M920 Owner's Manual page 26

M920 & M920W pH/Dual ORP Controller Owner's Manual
5. When the Dose Time is changed from either timed or
continuous feed, the Over Timer is reset to Default.
6. Turning off the Over Timer will void any NSF Certification and
is not recommended for safety reasons.
e. High Alert controlled by ORP1.
f. Low Alert controlled by ORP1.
g. pH Cal disabled
5. Temp Mode
a. Water Temperature will be displayed if the temperature sensor
is installed. Display will show the water temp when Temp mode
is entered and will not change while displayed.
b. Temperature can be calibrated by using the Up/Down arrow
keys (+/- 10 degrees).
c. Display can be changed from Fahrenheit to Celsius by pressing
the pH Cal button.
6. Flow
a. The controller and flow cell are shipped pre-mounted to a small
(16" x 12") or large (24" x 19") ABS plastic board. The integrated
flow switch is pre-wired to the controller.
b. The flow switch must be installed for safety reasons to prevent
dosing chemicals when there is no flow in the circulation piping.
c. Prior to installation, the controller operation can be tested by
tilting the populated mounting board until the controller's green
light turns on (flow switch magnet at the switch's top).
Figure 5: Flow Switch Terminal
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