SEAL PROBE (WATER-IN-OIL SENSOR)
PUMP CAN ALSO BE EQUIPPED WITH A WATER-IN-OIL SENSOR FITTED IN THE CONTACTOR
CHAMBER. A CONDUCTIVITY PROBE IS FITTED IN THE SEAL CHAMBER & MONITORS THE
CONDITION OF THE OIL. IN THE EVENT OF A CONTAMINATION OF THE LUBRICATING OIL BY
PUMPED WATER THE PROBE SENDS A SIGNAL TO THE BUILT IN SENSOR WHICH CUTS OFF
POWER TO THE MOTOR. THIS INDICATES A SEAL FAILURE OR WORN OUT SEAL AND IT IS
NECESSARY TO REPLACE THE SEALS AND FILL IN NEW OIL.
THE CONDUCTIVITY PROBE IS CONNECTED TO A 24V AC SUPPLY THROUGH A TRANSFORMER.
IN THE EVENT OF A SEAL FAILURE AND CONTAMINATION OF OIL BY WATER (APPROX. 10%)
THE PROBE GENERATES A SIGNAL, DETECTED BY A SENSOR, WHICH OPERATES A RELAY
THROUGH THE BRIDGE RECTIFIER. THIS RELAY OPERATES THE CO CONTACT WHICH OPENS
THE COIL CIRCUIT OF THE MAIN CONTACTOR AND ISOLATES THE PUMP FROM THE POWER
SUPPLY.
THE SENSOR COMPLETE WITH TRANSFORMER IS HOUSED IN A SHEET STEEL ENCLOSURE DULY
WIRED. THE ENCL. INCORPORATES AN LED AND A REMOVABLE FUSE. IN THE EVENT OF
WATER CONTAMINATION IN THE OIL THE SENSOR WILL ISOLATE THE PUMP AND THE LED
WILL LIGHT UP INDICATING THE OPERATION OF THE SENSOR. THE PUMP WILL NOT START
IN THIS CONDITION. IF YOU WOULD LIKE TO OPERATE THE PUMP, REMOVE THE FUSE AND
START THE PUMP.
WARNING: THE UNIT SHOULD NOT BE OPERATED FOR MORE THAN 10 DAYS AFTER THE SENSOR
HAS TRIPPED THE PUMP. THE PROBE OPERATION IS AN EARLY WARNING SIGNAL THAT THE
SEALS NEED REPLACEMENT --- DO NOT IGNORE THE SAME. IT IS ESSENTIAL THAT THE
SEALS BE REPLACED AND NEW OIL FILLED AS SOON AS POSSIBLE TO PREVENT FURTHER
DAMAGE TO THE UNIT. THE FUSE SHOULD BE REMOVED AND THE PUMP OPERATED IF
ABSOLUTELY NECESSARY.
IN THE EVENT OF OVERHEATING OF THE STATOR WINDING FOR ANY REASON, THE EMBEDDED
THERMAL SWITCHES WILL OPEN, CAUSING THE STARTER COIL TO DROP OUT AND ISOLATE
THE PUMP UNIT FROM THE MAINS. THESE SWITCHES DO NOT PROVIDE ANY PROTECTION IN
THE CASE OF A SHORT CIRCUIT, AND ADEQUATE H.R.C. FUSES SHOULD BE USED FOR SHORT
CIRCUIT PROTECTION.
GENERAL OVERHAUL AND OIL CHECK. (ALL MODELS)
DIS-ASSEMBLY (REFER DRG.NO.NC/200/01 SHEET 1 & 2)AT END OF MANUAL
1. ALWAYS REPLACE O-RINGS WITH NEW ONES WHENEVER DISMANTLING AND RE-ASSEMBLING
A PUMP. NEVER RE-USE OLD O-RINGS.
2. ALWAYS ISOLATE THE UNIT BEFORE REMOVING THE CONTACTOR COVER (1).BE CAREFUL
WITH O-RINGS (8) AND SEALING SURFACES. PROTECT THE CONTACTOR CHAMBER AGAINST
RAIN AND MOISTURE. CLEAN THE SEALING SURFACES CAREFULLY AND GREASE THE NEW
O-RINGS BEFORE FITTING THE SAME. DO NOT USE THE OLD O-RINGS.
3. DISCONNECT STATOR LEADS AND CHECK COIL OF CONTACTOR AND CONDITION OF
CONTACTS. IF CONTACTS ARE CORRODED OR PITTED, REPLACE CONTACTOR OR A NEW SET OF
CONTACTS. SNIP OFF LEAD WIRE CONNECTORS AND UNSCREW GROMMET NUT (48). REMOVE
LEAD WASHER (49) AND LEAD GROMMET (47). SLACKEN MOTOR LEAD WIRES TO FACILITATE
REMOVAL OF STATOR LATER, IF NECESSARY.
4. LOOSEN NUT (5) AND REMOVE OUTLET (24/27).
5. LOOSEN NUTS (5)(4 NOS TIGHTENING VOLUTE AGAINST PUMP BASE) AND REMOVE
VOLUTE. THE VOLUTE HAS TO BE MANEUVERED AND SLIDES OUT FROM ONE OPENING IN THE
PUMP BASE (23).
6. THE IMPELLER (33/34/35/93/94/95) IS NOW IN VIEW.
