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comply with the supply circuit.
If utilized, verify that power monitors or variable frequency
drives have been properly installed according to the manufac-
turer's instructions. To verify correct rotation of the motor:
1.
Install the pump into the system.
2. Fully open the suction and discharge valves.
3. Allow fluid to flow into the pump. Do not allow the pump to
run dry (ceramic, PTFE and silicon carbide bushings can't be
run dry without damage to pump components).
4. Jog the motor (allow it to run for 1-2 seconds) and observe
the rotation of the motor fan. Refer to the directional arrow
molded into the pump casing if necessary.
NOTE: A pump running backwards will pump but at a greatly
reduced flow and pressure.
Section III - Start-up and Operation
Start-up and Operation
1.
This pump must be filled from a flooded suction tank (grav-
ity) or primed with liquid from an outside source. The DB22
is not self-priming.
2. Open the inlet (suction) and discharge valves completely
and allow the pump to fill with liquid.
3. Close the discharge valve.
4. Turn the pump on. Slowly open the discharge valve. Adjust
the flow rate and pressure by regulating the discharge
valve. Do not attempt to adjust the flow with the suction
valve.
Shutdown
1.
Use the following procedure to shutdown the pump.
2. Slowly close the discharge valve.
3. Turn off the motor.
4. Close the suction valve.
Flush Systems
CAUTION: Some fluids react with water; use compatible
flushing fluid.
1.
Turn off the pump.
2. Completely close the suction and discharge valves
3. Connect flushing fluid supply to flush inlet valve.
4. Connect flushing fluid drain to flush drain valve.
5. Open flushing inlet and outlet valves. Flush system until the
pump is clean.
Optional Drain Installation
1.
Remove the impeller housing (item 1) from the pump
asssembly.
2. Clamp the impeller housing to a drill press table.
3. Using a 7/16" drill and the molded boss as a guide, drill
completely through the molded boss into the interior of the
impeller housing.
CAUTION: Do not tap too deep or the impeller housing may
be damaged.
4. Using a ¼" NPT tap, tap the hole in the molded boss to the
appropriate depth.
5. Install the drain plug or valve, being careful not to over-
tighten.
Section IV - Maintenance
Recommended maintenance schedule
The recommended maintenance schedule depends upon the
nature of the fluid being pumped and the specific application.
If the pump is used on a clean fluid, it is recommended that the
pump be removed from service and examined after six months
of operation or after 2,000 hours of operation. If the pump is
used on fluids with solids, high temperatures or other items
that could cause accelerated wear, then this initial examination
should be sooner.
After the initial examination of the internal components and wear
items are measured, a specific maintenance schedule can be
determined. For best results, it is recommended that the pump
be removed from service annually for examination.
Disassembly
WARNING: Rotating Parts. This pump has components
that rotate while in operation. Follow local safety standards
for locking out the motor from the power supply during mainte-
nance or service.
WARNING: Chemical Hazard. This pump is used for trans-
ferring many types of potentially dangerous chemicals. Always
wear protective clothing, eye protection and follow standard
safety procedures when handling corrosive or personally harm-
ful materials. Proper procedures should be followed for draining
and decontaminating the pump before disassembly and inspec-
tion of the pump. There may be small quantities of chemicals
present during inspection.
WARNING: Magnetic force hazard. This pump should only
be disassembled and assembled using the recommended pro-
cedures. The magnetic attraction is powerful enough to rapidly
pull the motor end and the wet end together. Do not place
fingers between the mating surfaces of the motor and wet ends
to avoid injuries. Keep the drive magnet and impeller assembly
away from metal chips or particles.
Stop the pump, lock out the motor starter, close all the valves
13
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