Hydrotech C, C PLUS, A PLUS, E, E-DC and E PLUS Series PULSAtron - Manual (Page 19)

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6.3 DIAPHRAGM REPLACEMENT cont'd.
• Apply grease to areas of the diaphragm that contact the deflection plate.
• 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
14. Turn diaphragm clockwise until deflection plate and shims are tight against
solenoid shaft and the 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.
• If not already done, adjust stroke length to 50%. Place the pump head onto
the adaptor with valve flow arrows pointing up and install and tighten pump
head screws. Tighten screws until pump head pulls up against adaptor.
NOTE: Adjust stroke length only when pump is running!
• Adjust stroke length back to 100% for easier priming and place pump back into
service.
6.4 VALVE REPLACEMENT
• Flush pump to clean any chemical from pump head.
• Unplug pump, release system pressure, and disconnect tubing or piping.
• Unscrew valve cartridges and discard. Also remove o-rings down inside the
pump head.
• 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 pump head is made
of SAN material.
• Reconnect tubing or piping and reinstall the pump.
• Check for leaks around newly installed fittings.