AmeriWater MRO3, Operation & Maintenance Manual

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MRO 3 & 4 MANUAL
28
98-0140
Rev. F
The current water temperature is shown on the bottom line to the right of operating hours.
When the unit is in STANDBY due to a shut down condition, the reading is replaced with ‘---‘.
WARNING MESSAGES
Warning messages are also shown on the second line. If any warnings are active, the active
warnings will alternate with the normal displays for the bottom line. The following lists the
warning messages.
TANK FULL OPERATION
The unit can be operated with 1 or 2 level switches. With 1 level switch, the switch is
connected to the contacts 1 & 6 on the side entry hood. When this switch has been active for
5 seconds, the unit will shut down on tank full. TANK FULL will show on the display. When
the tank full condition clears, the display will show TANK FULL 99. The number is the tank full
restart time and the unit will restart when this delay times out.
For 2 level switch operation, the upper switch is connected to contacts 1 & 6 while the lower
switch is connected to contacts 2 & 7 on the side entry hood. When both switches are
“open”, the MRO unit will start. The MRO unit will continue to run when the water level rises,
and while the lower switch becomes active (closed). When the upper switch becomes active
(closes), after the 5 second delay, the MRO unit will shut down. TANK FULL will show on the
display. When the tank level drops and the upper level switch clears, the display will show
TANK FULL 99 and the MRO unit will remain off. The number is the tank full restart time and
the number will blink until the lower level switch clears (opens). When the lower level switch
clears (opens), the number will remain steady and the MRO will restart when the delay times
out.
TANK FULL RESTART
The tank full restart is the delay before the MRO unit starts when a tank full condition clears.
This delay can be in minutes or in seconds. The TF Restart Setpoint selects seconds or
minutes.
TANK FULL OVERRIDE
A timed tank full override can be initiated when the MRO unit is shut down due to a tank full
condition. Pressing the Alarm Silence/Reset key for 3 seconds during a tank full condition will
enable the tank full override. The RO will start and TF OVERRIDE 9 will show on the display.
The number is the minutes remaining in the override timer. When the override times out, the
unit will return to the tank full shut down condition. The TANK FULL OVERRIDE will divert all
water to the drain, whether the water quality is good or bad coming into the RO.
PRESSURE FAULT
If the pressure fault input becomes active (closes) and stays active for the delay programmed
in the PF Delay Setpoint, the unit will shut down for a pressure fault. The display will show
PRESS FAULT, the alarm lamp will flash and the audible alarm will sound. The pressure fault
can be cleared by pressing the Alarm Silence/Reset key twice.