Nova-Tech Chem-Tech Series 100D-150D - Manual (Page 10)

10
TROUBLESHOOTING
PROBLEM PROBABLE CAUSE REMEDY
LOSS OF
CHEMICAL
RESIDUAL
1. Pump setting too low.
2. Scale at injection point
3. Solution container allowed to
run dry
1. Adjust to higher setting (feeder must be operating during the stroke length
adjustment).
2. Clean injection parts with 8% muriatic acid or undiluted vinegar.
3. Refill the tank with solution and prime. See Start-Up Section
TOO MUCH
CHEMICAL
1. Pump setting too high.
2. Chemical in solution tank too
rich.
3. Siphoning of chemical into
well or main line
1. Lower pump setting (pump must be operating to adjust the dial).
2. Dilute chemical solution. NOTE: For chemical that reacts with water, it may
be necessary to purchase a more dilute grade of chemical direct from
chemical supplier.
3. Test for suction or vacuum at the injection point. If suction exists, install an
anti-siphon valve. See Figure G.
LEAKAGE
AROUND TUBING
CONNECTIONS
1. Worn tube ends
2. Chemical attack
1. Cut off end of tubing (about 1") and then slip on as before or replace
suction valve housing and compression fitting to prevent leakage.
2. Consult your chemical supplier for compatible materials.
FAILURE TO
PUMP OR FEED
1. Leak in suction side of pump.
2. Valve seats not sealing.
3. Low setting on pump.
4. Low solution level.
5. Diaphragm ruptured.
6. Pump head cracked or
broken.
7. Pump head contains air or
chlorine gas.
1. Examine suction tubing. If worn at the end, cut approximately an inch off
and replace or replace valve body and coupling nut.
2. Clean valve seats if dirty or replace with proper material if deterioration is
noted.
3. When pumping against pressure, the dial should be set above 40%
maximum rated capacity for a reliable feed rate.
4. Solution must be above foot valve.
5. Replace diaphragm as shown in "Service" Section. Check for pressure
above 100 PSI (7 BAR) at the injection point. NOTE: Chemical incompatibility
with diaphragm material can cause diaphragm rupture and leakage around
the pump head.
6. Replace pump head as shown in "Service" Section, Do not use pipe tape
or other sealants. Make sure fittings hand tight only. Using pliers or wrench
can crack pump head. Also, chemical incompatibility can cause cracking and
subsequent leakage.
7. While pump is running, turn bleed valve adjustment screw counter-
clockwise until air is purged. Close bleed valve.
PUMP LOSES
PRIME
1. Dirty check valve.
2. Ball checks not seating or not
sealing properly.
3. Solution container allowed to
run dry
1. Remove and replace or clean off any scale or sediment.
2. Check seat and ball checks for chips, clean gently. If deformity or
deterioration is noted, replace part with proper material. Chemical
crystallization can hold check valves open, therefore the valves must be
disassembled and cleaned. Be sure to replace all parts as shown in the Parts
Diagram (at the end of the manual).
3. Refill the tank with solution and prime.
LEAKAGE AT
FITTING
1. Loose fittings
2. Broken or twisted gasket
3. Chemical attack
1. All fittings can be hand tightened to prevent leakage. Clean off chemicals
which have spilled on pump.
2. Check gaskets and replace if broken or damaged.
3. Consult your chemical supplier for compatible materials.
PUMP WILL NOT
PRIME
1. Too much pressure at
discharge
2. Check valves not sealing
3. Output dial not set at
maximum
1. Open bleed valve and circulate fluid until all air is purged from pump head
assembly. Close bleed valve.
2. Disassemble, loosen, clean and check for deterioration or swelling.
Reassemble and wet the valve assembly, then prime. See INSTALLATION
Section.
3. Always prime pump with output dial set at maximum rated capacity.
ANTI-SIPHON
VALVE
MALFUNCTION
1. Scale or particles have
plugged diaphragm
2. Ruptured valves
1. Remove, clean and reassemble, being careful not to wrinkle the
diaphragm. Check sequence and position of parts to be sure reassembly is
correct.
2. Consult your distributor for replacement.
PUMP MOTOR
STALLS
1. Pumping against excessive
pressure
2. Low voltage to pump
1. Test pressure to determine if it exceeds pump specifications. If so, consult
your distributor.
2. Make sure voltage of power source matches the voltage on the pump
specifications label. If not transformers are available.
MOTOR RUNNING
VERY HOT
1. Low voltage.
2. If using a step-down
transformer, it may be
undersized for the pump
1. Power supply voltage should match voltage on pump specification label.
2. Check the transformer to be sure it has at least 100 watts capacity.