Pentair AUTOTROL LOGIX 742 - Page 92

Installer manual Autotrol Magnum 293 - 298 Logix 742-762 - Troubleshooting
92 / 110 Ref. MKT-IM-012 / D - 03.02.2022
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:
ð Diaphragm failure in one of the valve cartridges. See table below for faulty cartridges.
ð 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.
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
1. A leak to the main 1.5" drain valve port.
ð If the system is newly installed, ensure that the start-up procedure has been properly
followed.
Refer to chapter Commissioning
ð 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.
2. Test the water leaking from the 1.5" drain port of the Magnum valve:
ð If it is treated, remove and inspect the #2 Rinse cartridge.
ð If it is untreated, remove and inspect the #1 Drain cartridge.
3. Leakage of untreated water to service.
ð Leak at riser pipe seal or any other cause mentioned in this troubleshooting chapter.
ð Bypassing of untreated water by #4 Inlet cartridge. Remove and inspect it.
4. Leak between the main valve body and the cartridge assembly.
ð 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 Magnum cartridges [
→
Page101]).
Info
Replacement cartridges are only available as complete assemblies.
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