Operation; Startup And Shutdown - IPS Controllers M790 Owner's Manual

M790 pH/ORP Controller Owner's Manual
III. Operation
A. Startup and Shutdown
1. Startup
a. Plug M790 power cord into power outlet. For outdoor
installations, ensure the use of a watertight outlet cover.
b. Turn on the filter pump and verify the water flow through
the flow cell by opening the sample port valve (center)
and observing a steady stream of water. The right side
valve may need to be partially closed to produce a steady
stream. Note: Water should pass over the pH and ORP
sensors for a minimum of 10 minutes to allow for accu-
rate, stable readings of pH and ORP levels from the pool
or spa.
c. Check for leaks and repair if necessary.
d. Manually adjust and balance the pool or spa water to
acceptable ranges using a test kit. Note: Use a DPD based
test kit to check the chlorine level.
e. Verify that the green Flow LED is illuminated. Both the pH
and ORP dose outputs are disabled if there is no water
flow.
f. Press the Mode pushbutton momentarily to place the
controller into the pH standby mode. The green pH
standby LED will illuminate. Select the desired pH set level
and dose time (continuous or timed).
g. While still in the pH standby mode, press the pH Cal
pushbutton to calibrate the reading to the value observed
through the manual testing of the water. Note: Always
calibrate using water from the sample port of the flow
cell.
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