Teikoku DynaPump LE Series, Instruction Manual

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A. A hand-held direction of rotation indicator is
available from Teikoku USA Inc and the
Chempump Division. This portable device
can be used to confirm the rotation of any
motor.
B. Use a phase sequence meter on the electri-
cal connections.
C. After the Dynapump LE is properly primed
and vented, open suction valve 100% and
start the unit with the discharge valve 20%
open. Note the discharge pressure at a pres-
sure gauge, which should be installed be-
tween the pump casing and discharge valve.
Reverse any two of the three power leads
and read the pressure gauge again. The
higher pressure is the correct direction of
rotation. It is recommended that the unit be
run as little as possible with a closed dis-
charge valve in order to prevent excessive
overheating of the fluid circulating within the
unit.
NOTE
If a discharge valve is not available an al-
ternate method is to use a flow meter and
determine higher flow rate. Wrong direc-
tion of rotation is indicated by a low dis-
charge pressure or flow rate. At shut-off,
head is about 2/3 of the head produced by
correct rotation. Continued operation in re-
verse can result in damage to the pump. If
reverse rotation has occurred, it is wise to
shut down the unit and tighten the impeller
bolt before restarting.
Once you have determined correct rotation, tag cor-
rectly connected main power leads, in accordance
with motor lead markings.
3-4. Starting Procedure
After priming, venting, and checking the direction of
rotation, put the pump in operation as follows:
1. Fully open the valve in the suction line.
2. Set the valve in the discharge line to 20% open.
3. Start the pump. Pump should operate with very
low noise and vibrations. Excessive or abnor-
SECTION 3. Operation
3-1. Procedure Before Initial Start
Before starting the pump for the first time, make sure
suction and discharge piping are free of tools, nuts,
bolts, or other foreign matter. Save time and money
by checking before start-up.
RECOMMENDED
Install a temporary 3/16" mesh screen near
the suction port to trap scale and other for-
eign particles. The screen can be installed
for 24 hours of operation, but watch closely
that the pump does not become starved
for fluid because of a clogged screen. RE-
MOVE SCREEN AFTER 24 HOURS OF RUN-
NING.
3-2. Priming and Venting
The pump must be primed before operating. Prim-
ing requires the filling of the pump casing and motor
chamber with liquid.
When there is a positive suction head on the pump,
priming can be accomplished by opening the valves
in the suction and discharge line, and allowing the
pump casing and motor chamber to fill. The
Dynapump LE Series is centerline discharge and is
self-venting when installed in the horizontal position.
3-3. Rotation Check
Centrifugal pump impellers must rotate in the proper
direction to deliver rated head and capacity. The im-
peller must rotate in the same direction as the arrow
cast on the pump casing.
The correct direction of rotation can be checked as
follows:
Wire Dynapump LE Series motor for correct voltage.
1. With main power leads connected, check direc-
tion of impeller rotation. If the unit is not installed
in the system, rotation can be observed by “bump-
ing” the motor and looking into the suction flange.
NEVER LOOK INTO THE DISCHARGE FLANGE . If
direction of impeller rotation is incorrect, change
two power leads.
2. If the pump is installed and primed, the direction
of rotation can be checked by the following meth-
ods:
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