Grundfos MTC User manual

Installation and Operating Instructions
L-MT-TL-013 4/01
PRINTED IN USA
LIMITED WARRANTY
Products manufactured by GRUNDFOS PUMPS CORPORATION (Grundfos) are warranted to the original user only to be
free of defects in material and workmanship for a period of 18 months from date of installation, but not more than 24 months
from date of manufacture. Grundfos' liability under this warranty shall be limited to repairing or replacing at Grundfos' option,
without charge, F.O.B. Grundfos' factory or authorized service station, any product of Grundfos manufacture. Grundfos will
not be liable for any costs of removal, installation, transportation, or any other charges which may arise in connection with
a warranty claim. Products which are sold but not manufactured by Grundfos are subject to the warranty provided by the
manufacturer of said products and not by Grundfos' warranty. Grundfos will not be liable for damage or wear to products
caused by abnormal operating conditions, accident, abuse, misuse, unauthorized alteration or repair, or if the product was
not installed in accordance with Grundfos' printed installation and operating instructions.
To obtain service under this warranty, the defective product must be returned to the distributor or dealer of Grundfos products
from which it was purchased together with proof of purchase and installation date, failure date, and supporting installation
data. Unless otherwise provided, the distributor or dealer will contact the Grundfos factory or authorized service station for
instructions. Any defective product to be returned to the factory or service station must be sent freight prepaid;
documentation supporting the warranty claim and/or a Return Material Authorization must be included if so instructed.
GRUNDFOS WILL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSSES, OR
EXPENSES ARISING FROM INSTALLATION, USE OR ANY OTHER CAUSES. THERE ARE NO EXPRESS OR IMPLIED
WARRANTIES, INCLUDING MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, WHICH EXTEND
BEYOND THOSE WARRANTIES DESCRIBED OR REFERRED TO ABOVE.
Some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages and some jurisdictions
do not allow limitations on how long implied warranties may last. Therefore, the above limitations or exclusions may not
apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from jurisdiction
to jurisdiction.
Page 6
Grundfos Pumps Corporation • 3131 N. Business Park Avenue • Fresno, CA 93727
Customer Service Centers: Allentown, PA • Fresno, CA
Phone: [phone] • Fax: [phone]
Canada: Oakville, Ontario • Mexico: Apodaca, N.L.
Visit our website at www.us.grundfos.com
Please leave these instructions with the pump for future reference
MTC
SAFETY WARNING
Page 1
PRE-INSTALLATION CHECKLIST
Page 1
INSTALLATION PROCEDURES
Page 2-3
OPERATING THE PUMP
Page 3
TROUBLESHOOTING
Page 4
LIMITED WARRANTY
Page 6
CONTENTS

SAFETY WARNING
Electrical Work
All electrical work should be performed by a qualified electrician in
accordance with the latest edition of the National Electrical Code,
local codes and regulations.
The safe operation of this pump requires that it be grounded in
accordance with the National Electrical Code and local governing
codes or regulations. Connect the ground wire to the grounding
screw in the terminal box and then to the acceptable grounding
point.
1. Confirm You Have The Right Pump
• Read the nameplate to ensure it is the one you ordered
• Compare the pump's nameplate data or its
performance curve (for head, GPM, etc.) with the
application in which you plan to install it.
Will it do what you expect it to do?
2. Check the Condition of The Pump
The shipping carton your pump came in is specially designed
around your pump during production to prevent damage. As a
precaution, it should remain in the carton until you are ready to
install it. At that point, look at the pump and examine it for any
damage that may have occurred during shipping. Examine any
other parts of the shipment as well (electrical control boxes,
etc) for any visible damage. If you find any, contact the
transportation company in writing and ask to have it inspected.
3. Electrical Re uirements
Verification of the electrical supply should be made to be
certain the voltage, phase and frequency match that of the
pump motor. The proper operating voltag eand other electrical
information can be found on the motor nameplate. These
motors are designed to run on ±10% of the nameplate-rated
voltage. For dual-voltage motors, the motor should be internally
connected to operate on the voltage closest to the 10% rating,
i.e., a 208 voltage motor wired per the 208 volt connection
diagram. The wiring connection diagram can be found on the
plates attached to the motor.
If voltage variations are larger than ±10%, do not operate
the pump.
4. Glance Through This Guide
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.
5. Application
The Grundfos pumps, type MTC, are multistage centrifugal
pumps designed for pumping liquids for machine tools,
condensate transfer, liquid transfer in industrial washing
machines and similar applications.
The pump must not be used for the transfer of inflammable liquids
such as diesel oil, petrol or similar liquids. The pump is designed
for pumping liquids with a density and viscosity corresponding to
those of water. The pumped liquid must not contain fibers. When
pumping liquids with a density or viscosity higher than that of
water, the motor size should be taken into consideration.
Shock Hazard
A faulty motor or wiring can cause electrical shock that could be
fatal, whether touched directly or conducted through standing
water. For this reason, proper grounding of the motor frame to the
power supply's grounding terminal is required for safe installation
and operation.
In all installations, the above-ground metal plumbing should be
connected to the power supply ground as described in Article 250-
80 of the National Electrical Code.
Pre-Installation Checklist
Page 1
WARNING
6. Type Designation
The standard range of pumps encompasses complete impeller
in chamber combinations. Other lengths, against duty
combinations, can be supplied by fitting empty intermediate
chambers instead of standard chambers with impellers.
The pump key on the pump nameplate indicates the number of
chambers and impellers fitted to the pump.
7. Technical Data
MTC 4 - 50 / 3 A -W -A -XXXX
Pump Range
Nominal Flow Rate in m3/h
Number of Stages x 10
Number of Impellers
Code for Pump Version
Code for Pipework Connection
Code for Materials
Code for Shaft Seal and Rubber Pump Parts
TDKV = "Sealless" for MTC 2/4
BUUV = For grinding applications MTC 2/4
AUUV = Seal for MTC 8/12/16
6.1 Pump Key
ExampleExample
ExampleExample
Example
MTC 2,4 MTC 8, 12, 16
Minimum liquid temperature (°C/°F) – 10/+14
Maximum liquid temperature (°C/°F) +90/+194
Maximum ambient temperature (°C/°F) +55/+131 +40/+104
Maximum operating pressure (bar/psi) 8/116 12/174
Enclosure class IP54 (TEFC)
WARNING

Installation Procedures
Page 2
Operating The Pump
Page 3
Installation
The pump must be installed so that persons cannot accidentally
come into contact with the hot surface of the motor.
Pump Location
The pump is designed for tank mounting in vertical position. The
pump is positioned in a hole cut into the cover of the tank (upper
side) and is secured to the tank by four hexagon head screws
through the holes in the mounting flange. It is recommended to fit
a sealing gasket between the pump flange and tank.
NOTE: The pumps can only be mounted in vertical position.
The MTC 2 and 4 must have access to the tank from the drain
channel in the motor stool.
WARNING
MTC 2 AND 4
Figure 1
Pump mounting flange dimensions:
Suction Conditions
The bottom of the pump strainer must be at least 25 mm above the
bottom of the tank.
The pumps are designed to provide full performance down to a level
of A mm above the bottom of the strainer.
At a liquid level between A and B mm above the bottom of the
strainer, the built-in priming screw will protect the pump against dry
running.
Pump A B
Type (mm/in) (mm/in)
MTC 2, 4 37/1.1 22/0.9
MTC 8, 12, 16 40/1.6 25/1.0
MTC 2 AND 4
MTC 8, 12 & 16
Electrical Connection
The electrical connection should be carried out in accordance with
local regulations.
The operating voltage and frequency are marked on the pump
nameplate. Please make sure that the motor is suitable for the
electricity supply on which it will be used.
The motor must be connected to a motor starter.
The terminal box, for motors up to and including 1.1 kW, can be
turned to four positions, in 90° steps, see Figure 4. Proceed as
follows:
1. Removed the four bolts
securing the motor to the
motor stool.
2. Turn the motor to the
required position.
3. Replace and tighten the
four bolts.
WARNING
Never make any connections in the pump terminal box unless
the electricity supply has been switched off.
If the pump is not connected to an electric installation, it must
be connected to an external mains switch.
Figure 2
Figure 3
The electric motor should be connected to the supply as shown in
the diagram inside the terminal box cover.
All other motors, from 1.5 kW and up, cannot be turned.
Start-up
WARNING – MTC 8, 12 and 16
Pay attention to the direction of the vent hole and take care to
ensure that the escaping water does not cause injury to persons
or damage to the motor or other components. See Figure 5.
Figure 5
Before starting the pump, make sure:
• that all pipe connections are tight.
• that the pump body is partly filled with liquid (partly submerged).
• that the strainer is not blocked by impurities.
Start the pump as follows:
1. Close the isolating valve on the discharge side of the pump.
2. See the correct direction of rotation of the pump on the motor
fan cover. When seen from the top, the pump should rotate
counter-clockwise.
3. Start the pump and check the direction of rotation.
4. MTC 2 and 4:
Open the discharge isolating valve a little.
MTC 8, 12 and 16:
Loosen the air vent screw in the motor stool.
5. MTC 2 and 4:
Completely open the discharge isolating valve.
MTC 8, 12 and 16:
When a steady stream of liquid runs out of the vent hole,
tighten the air vent screw and completely open the isolating
valve.
The pump has now been vented and is ready for operation.
Operation and Maintenance
Note: The pump is not allowed to run against a closed
discharge valve for more than approximately five minutes as
this will cause an increase in temperature/formation of steam in
the pump which may cause damage to the pump.
Lubrication and Maintenance
Pumps installed in accordance with these instructions require very
little maintenance.
When a mechanical shaft seal is fitted, it is self-adjusting and has
wear-resistant seal rings which are lubricated and cooled by the
pumped liquid.
The pump bearings are also lubricated by the pumped liquid. The
motor ball bearings are grease packed and sealed for life. No
further lubrication is necessary.
Pumps from 4 kW and up have angular contact bearings.
Filter
Chip trays, filters, etc. should be cleaned at regular intervals to
ensure a correct flow of liquid.
Periodic Checks
At regular intervals, depending on the conditions and time of
operation, the following checks should be made:
• Check the quantity of liquid and operating pressure.
• Check that there are no leaks.
• Check that the motor is not overheating.
• Check the tripping of the motor starter.
• Check that all controls are operating satisfactorily.
If the above checks do not reveal any abnormal operating details,
no further checks are necessary.
Should any faults be found, check the symptons with the Fault
Finding Chart, page 4.
Service
WARNING
If a pump has been used for pumping liquids which are injurious
tohumanhealthorpoisonous,itwillbeclassifiedascontaminated.
Do not turn the pump upside down during service. Residual
liquids from the chambers may damage the motor.
A contaminated pump must not be sent to Grundfos for service until
Grundfos has received all necessary details about the pumped
liquid, etc. Otherwise, Grundfos can refuse to accept the pump for
servicing.
Possible costs of returning the pump are to be paid by the customer.
Sound Pressure Level
D1 D2 D3 L X
MTC (mm/in) (mm/in) (mm/in) (mm/in) C (mm/in)
2, 4 140/5.51 160/6.30 180/7.09 121/4.76 3⁄4" NPT 7/0.28
8, 12, 16 180/7.09 210/8.27 200/7.87 100/3.94 1 1⁄4" NPT 9/0.35
Figure 4
Operating The Pump
Motor
(kW) 50 HZ 60 HZ
0.25 <70 <70
0.37 <70 <70
0.55 <70 <70
0.75 <70 <70
1.1 <70 <70
1.5 <70 71
2.2 <70 71
3.0 <70 71
4.0 73 71
5.5 73 78
7.5 73 78
LpA [dB(A)]

Troubleshooting
Page 4
If The Pump... It May Be Caused By... Correct It By...
Connect the electricity supply
Replace fuses
Reactivate the motor protection
Replace contacts or magnetic coil
Repair the control circuit
Replace the motor
Does Not Run
Motorstarter overload trips
out immediately when
supply is switched on
Motorstarter overload trips
out occassionally
Motor starter has not
tripped out but the pump
does not run
Pump runs but gives no
liquid or pump capacity is
not constant
a) Supply failure
b) Fuses are blown
c) Motor starter overload has tripped out
d) Main contacts in motor starter are not making contact or
the coil is faulty
e) Control circuit is defective
f) Motor is defective
Fault Finding Chart
WARNING
Before starting work on the pump, make sure that the electricity supply has been switched off and that it cannot be accidentally switched on.
a) One fuse/automatic circuit breaker is blown
b) Contacts in motor starter overload are faulty
c) Cable connection is loose or faulty
d) Motor winding is defective
e) Pump mechanically blocked
f) Overload setting is too low
a) Overload setting is too low
b) Low voltage at peak times
a) Check 1 a), b), d) and e)
a) Pump strainer partly blocked by impurities
b) Liquid level in tank too low
c) Pump rotates in the wrong direction
Cut in the fuse
Replace motor starter contacts
Fasten or replace the cable connection
Replace the motor
Remove the mechanical blocking of the pump
Set the motor starter correctly
Set the motor starter correctly
Check the electricity supply
Clean the strainer
Increase the liquid level
Change the direction of rotation of the motor
Disposal
Disposal of this product must be carried out according to the
following guidelines:
1. Use the local public or private waste collection service.
2. In case such waste collection service does not exist or cannot
handle the materials used in the product, please deliver the
product or any hazardous materials from it to your nearest
Grundfos company or service workshop.