M920 & M920W pH/Dual ORP Controller Owner’s Manual
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5. When the Dose Time is changed from either med or
connuous feed, the Over Timer is reset to Default.
6. Turning o the Over Timer will void any NSF Cercaon 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 buon.
6. Flow
a. The controller and ow cell are shipped pre-mounted to a small
(16” x 12”) or large (24” x 19”) ABS plasc board. The integrated
ow switch is pre-wired to the controller.
Figure 5: Flow Switch Terminal
b. The ow switch must be installed for safety reasons to prevent
dosing chemicals when there is no ow in the circulaon piping.
c. Prior to installaon, the controller operaon can be tested by
lng the populated mounng board unl the controller’s green
light turns on (ow switch magnet at the switch’s top).
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