TP32-80/2 Installation and operating instructions

512
Temperature range
• Minimum +5°F (-15°C)
• Maximum +284°F (140°C)
Maximum working pressure:
145 PSI (10 bars)
1.5 Read This Guide Thoroughly
Even if you are very familiar with the
installation of this pump, a quick glance
through the remaining sections of this
guide may help you avoid a potential
problem.
For TPE pump installation, see Grundfos
Pumps publication L-EC-TL-001.
2. Installation Procedures
2.1 Electrical Preparation
2.1.1 Terminal Box Position
Before installing the pump, you must de-
termine the most convenient position for
the terminal box, which can be rotated in
90° increments. To rotate the terminal box,
remove the four bolts securing the motor
to the pump, lift and rotate the motor, and
retighten the bolts. (See page 9.)
Fig. 2
2.1.2 Single-Phase Motors
These motors are multi-voltage with built-
in automatic resetting thermal protection
to prevent overheating.
2.1.3 Three-Phase Motors
A motor starter is required to ensure the
motor is protected from damage caused by
low voltage, phase failure, current imbal-
ance, and overloads.
• Motor starter — should be properly
sized, have a manual reset, and ambi-
Capacitor
(single-phase only)
ent-compensated extra quick trip in all
three legs.
• Overload — should be sized and ad-
justed to trip at the full-load current rat-
ing of the motor. If the motor is lightly
loaded, the overload should be re-sized
or adjusted to a lower value. Under no
circumstances should the overloads be
set to a higher value than the full load
current shown on the motor name-
plate. Overloads for auto transfers and
resistant starters should be sized in
accordance with the recommendations
of the manufacturer.
• Fused disconnect — recommended for
each pump where service and standby
pumps are installed. An alternating
switch should be used so each pump
can be equally operated to even the
wear.
2.1.4 Other Wiring Considerations
The pump must be grounded. Wire sizes
should be based on the ampacity (current
carrying properties of a conductor) as re-
quired by the latest edition of the National
Electrical Code or local regulations.
In most cases, direct on line (D.O.L.) start-
ing is approved due to the extremely fast
run-up time of the motor and the low
moment of inertia of the pump and motor.
If D.O.L starting is not acceptable, an auto
transformer or resistant starter should be
used.
2.2 Piping Considerations
Whenever possible, avoid high pressure-
loss fittings (elbows, branch tees, etc)
directly on either side of the pump. The
pump and piping should be adequately
supported on both sides to reduce thermal
and mechanical stresses on the pump.
Pipe, valves, and fittings should be at least
the same diameter as the discharge pipe
to reduce excessive fluid velocities and
friction losses. They should also have a
pressure rating equal to or greater than
the maximum system pressure.
A bypass or pressure relief valve should
be installed in the discharge pipe if there
is any possibility the pump may operate
against a closed valve in the discharge line.
Circulation through the pump is required
to ensure adequate cooling and lubrication
of the pump.
5.2 Diagnosing Specific Problems
If the pump... It may be caused by... Check this by...
Does not run
1. No power at motor. Check for voltage at terminal box.
2. Fuses are blown or circuit
breakers are tripped.
Turn off power and remove fuses and check for
continuity with an ohmmeter.
3. Motor starter overloads are
burned or have tripped.
Check for voltage on the line and load side of the starter.
4. Starter does not energize. Energize control circuit and check for voltage at the
holding coil.
5. Defective controls. Check all safety and pressure switches for operation.
Inspect contact in control devices.
6. Motor is defective. Turn off power. Disconnect the wiring. Measure the
lead-to-lead resistance with an ohmmeter (set at R x 1).
Measure lead-to-ground values with a megohmmeter
(R x 100K). Record the measured values.
7. Defective capacitor.
(Single-phase motors)
Turn off the power, then discharge the capacitor.
Disconnect the leads and check them with an ohmmeter
(R x 100K).
Pump runs, but at
a reduced capacity
or
Doesn’t deliver
water
1. Wrong rotation
(Three-phase only)
Check for proper electrical connections in terminal box.
2. Pump is not primed or is air-
bound.
Turn pump off, close isolation valves, remove priming
plug. Check fluid level.
3. Strainers, check valves, or foot
valves are clogged.
Remove strainer, screen, or valve and inspect.
4. Suction lift too large. Install compound pressure gauge at the suction side
of the pump. Start pump and compare reading to
performance data.
5. Suction and/or discharge piping
leaks.
Pump shaft spins backwards when turned off. Air in
suction pipe.
6. Worn pump. Install pressure gauge, start the pump, gradually close
the discharge valve and read pressure at shut-off.
Pump cycles too
much
1. Pressure switch is not properly
adjusted or is defective.
Check pressure setting on switch and operation.
2. Level control is not properly set
or is defective.
Check voltage across closed contacts.
3. Three-phase current is unbal-
anced.
Check setting and operation.
4. Tank is too small. Pump air into tank or diaphragm chamber. Check tank
size and air volume in tank.
Fuses blow
or
Circuit breakers
trip
1. High or low voltage. Check voltage at the starter panel or terminal box.
2. Starter overloads are set too low. Cycle pump and measure amperage.
3. Three-phase current is unbal-
anced.
Check the current draw on each lead to the motor.
4. Motor is shorted or grounded Turn off power and disconnect incoming power supply
from terminal box. Measure winding and lead-to-ground
resistance as explained on the previous page.
5. Wiring or connections are faulty. Check for proper wiring and loose terminals.
6. Pump is stuck. Turn off power and manually rotate pump shaft.
7. Defective capacitor.
(Single-phase only)
Turn off power, discharge capacitor and check with
ohmmeter set at highest R value or check with capacitor
meter.