Pentair AUTOTROL MAGNUM 742 - Page 89

Installer Manual Magnum 742-762 - Troubleshooting
Ref. MKT-IM-012 / C - 25.10.2019 89 / 106
There are four symptoms that may require a cartridge to be removed and inspected or replaced.
1. A constant leak from the pilot drain in any cycle position.
A small discharge of water from the pilot drain while transitioning from one cycle to the next is
normal. A leak from the pilot drain could be caused by the following:
- Diaphragm failure in one of the valve cartridges. See table below for faulty cartridges.
- Debris may prevent the flappers from closing.
Inspect discs and seats. Quick cycle the logix Magnum to each cycle indicated below. If the leak
stops in a particular cycle, remove the cartridge listed in the right column. Inspect for wear or
damage.
2. A leak to the main 1.5" drain valve port.
- If the system is newly installed, ensure that the start-up procedure has been properly followed.
Refer to chapter 7. Commissioning, page 62.
- If the system has been operating correctly for a period of time and is now leaking, regenerate
the unit if the media bed is exhausted. Then proceed as follow.
Test the water leaking from the 1.5" drain port of the Magnum valve:
- If it is treated, remove and inspect the #2 Rinse cartridge.
- If it is untreated, remove and inspect the #1 Drain cartridge.
3. Leakage of untreated water to service.
- Leak at riser pipe seal or any other cause mentioned in this troubleshooting chapter.
- Bypassing of untreated water by #4 Inlet cartridge. Remove and inspect it.
4. Leak between the main valve body and the cartridge assembly.
- Remove and replace the two small O-rings at 5:30 and 6:30 positions of the cartridge (part
number for the O-ring set : P/N 1010116. See chapter 11.7. Magnum cartridges, page 98).
Note
Replacement cartridges are only available as complete assemblies.
No leak during Cartridge
Service cycle (C0) #3 Outlet
Backwash (C1) #1 Drain
Brine (C2)/Slow rinse (C3) #2 Rinse
Fast rinse (C5) #2 Rinse or #4 Inlet
Cartridge #1 Drain P/N 1000366
Cartridge #2 Fast rinse P/N 1000365
Cartridge #3 Service
P/N 1000366 (No bypass)
P/N 1000336 (Cap only for
bypass)
Cartridge #4 Inlet P/N 1000317