IPS Controllers M920 - Page 15

M920 & M920W pH/Dual ORP Controller Owner’s Manual
c. Run the sensor cable into the controller through the strain relief
marked “temp” and connect to the terminal block on the front
circuit board marked “Temp”.
5. Electrical Connecons (Should be completed by a licensed
electrician)
a. Verify that the M920 controller power is OFF.
b. Connect the pH feeder connecon to the appropriate peristalc
pump or other device.
c. Connect the ORP feeder connecon to the appropriate
peristalc pump or other device. Note: There is another
conneconportforORP2.
d. Method 1 (recommended): Connect the AC power cord to the
load-side of the circulaon pump circuit. This will only provide
power to the M920 when the circulaon pump is running.
e. Method 2: Connect the AC power cord to a GFCI power source,
or separately purchased IPS Controllers PressureSwitch (part #
PS100).
f. Connect the pH sensor connector to the corresponding lower
port (labeled pH) at the right edge of the controller.
g. Connect the ORP sensor connector to the corresponding upper
port (labeled ORP) at the right edge of the controller.
6. Chemical injecon must be inserted in the return line, aer
(downstream) any equipment.
7. Oponal connecon to a Salt Chlorine Generator (SCG)
The M920 controller is capable of controlling (turning on/o) a SCG
depending on the current ORP reading. This acon can be accomplished
using a 120V or 240V relay, or by connecng the SCG to the “normally
open” dry contact relay (ORP1) included with the M920 controller. When
using the ORP1 Dry Contact Relay, the black plasc jumper idened as
HD2 needs to be reposioned from the lower posion (see Figure 4) to
the open pegs at the top.
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