AmeriWater MRO3, Operation & Maintenance Manual

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MRO 3 & 4 MANUAL
47
98-0140
Rev. F
9.5 SOLENOID TEST PROCEDURE
Feed Solenoid
1. With the MRO Off, turn the Incoming Tap Water supply on. If there is water flowing
to the drain, the solenoid has failed open.
2. Turn on the MRO, with the Incoming Tap Water supply still on. If there is no flow to
the drain, the solenoid has failed closed.
3. Use a voltmeter to verify that power is not being supplied to the INLET SOLENOID
VALVE terminal when the MRO is off, and that power is being supplied to the terminal
when the MRO is on. If the power supply is normal, the solenoid valve is bad. If the
power supply is not correct, see Section 9, Controller Troubleshooting.
Disinfect Solenoid
1. Turn off the MRO.
2. Turn the knob on the Reject Water flow meter counterclockwise about 2 – 3
revolutions.
3. Press and hold the LEFT ARROW KEY and press the RIGHT ARROW KEY to access
the DISINFECT MODE.
4. Hold in the ENTER KEY until water flows to the drain . If there is no water flow to the
drain, the solenoid has failed closed.
9.6 SOLENOID VALVE REPLACEMENT
For all valves, Feed, Disinfect, or Product Divert Solenoid Valves
1. Turn off the MRO by pressing the POWER key (the display will show STANDBY),
unplug the power cord from the electrical outlet, turn off the wall disconnect, and place
a lockout in the disconnect handle.
2. Turn off the incoming tap water supply to the MRO.
3. Open the access panel of the cabinet.
4. Remove the membrane(s) and pump (see Section 9.4).
5. Disconnect the solenoid wiring harness plug from the solenoid valve.
6. Disconnect the hoses/tubing as described in the kit installation instructions.
7. Make sure that the flow direction arrow located on the side of the valve is pointing in
the correct direction (arrow pointing left as viewed from the opening).