Hydrotech MP Series PULSAtron - Manual (Page 24)

24
Refer to drawings in the back of the manual.
1. When replacing the diaphragm, it’s always a good idea
to replace the valve cartridges and other worn parts. A kit
is available from your supplier with all parts necessary to
completely rebuild your pump’s wet end. All your supplier
needs to know is the “KOPkit No.” on your pump’s
nameplate to supply this kit.
2. Set pump stroke length to 0% and unplug the pump.
3. If you kept the shims from the original diaphragm or know
the original quantity you can avoid Step #4 for shimming
the diaphragm and go to Step #5.
4. Slide the diaphragm deflection plate onto the back of the diaphragm stud, radius side towards the diaphragm.
Next slide two shims onto the diaphragm threaded stud and screw the diaphragm into the EPM unit. Refer to
Figure R. Turn diaphragm clockwise until deflection plate and shims are tight against solenoid shaft, diaphragm
stops turning. If there is a gap between the adaptor and diaphragm, repeat the procedure removing one shim
each time until the diaphragm just touches the adaptor or is slightly recessed.
5. Apply grease to areas of the diaphragm that contact the deflection plate or radius on the adaptor.
6. Screw the diaphragm into the EPM unit’s shaft with the deflection plate and appropriate number of shims in
between.
7. Adjust stroke length to 50%. It is easier to do this if you temporarily turn the pump on. Place the pumphead
onto the adaptor with valve flow arrows pointing up and install and tighten pumphead screws. Tighten screws
until pumphead pulls up against adaptor.
8. Adjust stroke length back to 100% for easier priming and place pump back into service.
VALVE REPLACEMENT
1. Flush pump to clean any chemical from pump head.
2. Unplug pump, release system pressure, and disconnect any tubing or piping.
3. Unscrew valve cartridges and discard. Also remove O-Rings down inside pumphead.
4. Using new O-Rings, install new valve cartridges with stamped letters reading from top to bottom, and the arrow
pointing in the direction of flow. Hand tighten only, do not use wrenches or pliers. This is especially important
when the pumphead is SAN material.
5. Reconnect tubing or piping and reinstall the pump.
6. Check for leaks around newly installed fittings.