Nova-Tech Chem-Tech Series 100-150 - Manual (Page 9)

9
7. A setting of "0" will now give zero output. One full revolution of the knob counter clockwise will give maximum output.
The knob should never be turned more than one full revolution.
SERVICING AND REPAIRS
REPLACEMENT OF PUMP HEAD ASSEMBLY OR DIAPHRAGM:
Before performing any repairs on Series 100/150 chemical
feeders, be sure to disconnect all electrical connections and
relieve pressure from suction/discharge tubing.
The Series 100/150 feeder was designed so that servicing can be
quick and simple. Proper part replacement procedures are
described below.
NOTE: Use protective gloves and safety glasses when
working on or around chemical feeder.
1. Disconnect the tubing. Remove the suction valve and
discharge valve being careful not to lose the ball checks and
any other small parts. (Figure N)
2. Remove the four screws from the face of the head and
remove the head.
3. Remove the diaphragm by inserting one or two of the head
bolts into the holes of the diaphragm and turning counter-
clockwise. (Figure O)
4. A new pump head or diaphragm should be installed if either is broken or cracked (see parts list at the end of this
manual). The new pump head can be installed by going through the above steps in reverse.
5. Be sure the drive bracket assembly is in the fully retracted position when installing the new diaphragm. Install the
new diaphragm by screwing it in hand tight, then, back off one-fourth turn or until screw holes are lined up.
6. Replace the head and the head screws, being certain the discharge fitting is up. NOTE: Arrow on outside of pump
head should be in vertical position pointing upward. Tighten the head screws evenly and carefully to prevent cracking
the head.
7. Replace the suction and discharge fittings making sure all gaskets and valves are fitted properly. Do not use pipe tape
or other sealants. HAND TIGHTEN ONLY. Restart the system as in the start up procedures (INSTALLATION).
BALL CHECKS AND VALVE SEAT REPLACEMENT:
The following procedure is the same for any of the four
valves.
Make sure all electrical connections are disconnected
and pressure valves off.
NOTE: Use protective gloves and safety glasses while
replacing parts.
1. Unscrew compression nut and remove tubing.
2. Unscrew check valve body from pump head, foot valve,
or injection fitting.
3. Remove all seats, ball checks, and gaskets and
replace.
4. Replace the check valve body so fitting makes contact
with the gasket and the pump head, foot valve or
injection fitting, whichever the case may be. HAND
TIGHTEN FITTINGS ONLY. Do not use pipe tape or
other sealants on these threads.
5. Re-install the tubing and tighten coupling nut HAND TIGHT.
6. Restart the system as in the INSTALLATION PROCEDURES.