MRO 3 & 4 MANUAL
45
98-0140
Rev. F
PROBLEM
INVESTIGATION
CORRECTIVE ACTION
RO Pump Will Not Operate
(Cont.)
Is the system in standby?
If no, are any shut down
conditions active?
If no, is the RO LED, DS6
lit?
If yes, with a voltmeter, verify
if there is power on the RO
pump terminals. Is there
power?
If no, replace the board.
If no, replace the board.
If yes, check the pump and
wiring.
No or incorrect conductivity
reading
Is sensor wired correctly?
If yes, is sensor installed
inline as shown in the tubing
diagram on page 18?
If yes, verify correct
Conductivity range. Range
correct?
Does unit calibrate OK?
If no, disconnect green and
white wires of sensor. Does
reading show 0?
If yes, reconnect wires and
remove sensor from piping
and dry. Does reading show
0?
If yes, short terminals of cell
together. Does reading show
‘^^^’ ?
If no, correct wiring.
If no, install correctly.
If no, correct range.
If yes, calibrate unit.
If no, replace board.
If no, replace cell.
If no, replace board.
Summary of Contents for MRO3
Page 8: ...MRO 3 4 MANUAL 5 98 0140 Rev F SECTION 3 COMPONENTS AND SCHEMATICS 3 1 EXTERNAL FRONT VIEW...
Page 10: ...MRO 3 4 MANUAL 7 98 0140 Rev F 3 2 INTERNAL REAR VIEW...
Page 12: ...MRO 3 4 MANUAL 9 98 0140 Rev F 3 3 ELECTRICAL DIAGRAM MRO3 MRO4...
Page 13: ...MRO 3 4 MANUAL 10 98 0140 Rev F 3 4 FLUID DIAGRAM MRO3 MRO4...
Page 34: ...MRO 3 4 MANUAL 31 98 0140 Rev F FIGURE 6 2...
Page 35: ...MRO 3 4 MANUAL 32 98 0140 Rev F FIGURE 6 3...
Page 52: ...MRO 3 4 MANUAL 49 98 0140 Rev F SECTION 11 MRO3 4 SPARE PARTS LISTING...
