Grundfos MTC User manual

MTC
GRUNDFOS INSTRUCTIONS
Installation and operating instructions

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 24 months from date of installation, but not morethan 30 months from
date of manufacture. Grundfos' liability under this warranty shall be limited to repair-
ing 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 manu-
facturer 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 Grundfos or
an authorized service station for instructions. Any defective product to be returned
to Grundfos or a service station must be sent freight prepaid; documentation sup-
porting the warranty claim and/or a Return Material Authorization must be included
if so instructed.
GRUNDFOS WILL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUEN-
TIAL DAMAGES, LOSSES, OR EXPENSES ARISING FROM INSTALLATION,
USE, OR ANY OTHER CAUSES. THERE ARE NO EXPRESS OR IMPLIED WAR-
RANTIES, 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 conse-
quential damages and some jurisdictions do not allow limit actions 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.
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CONTENTS Page
1. Applications 3
2. Type designation 3
2.1 Pump key 3
3. Technical data 4
4. Installation 4
4.1 Pump location 4
4.2 Suction conditions 4
5. Electrical connection 5
6. Start-up 5
7. Operation and maintenance 6
7.1 Lubrication and maintenance 6
7.2 Filters 6
7.3 Periodic checks 6
8. Service 6
9. Sound pressure level 6
10. Fault finding chart 7
11. Disposal 7
1. Applications
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 applica-
tions.
The pumped liquid must not contain fibres.
The pump is designed for pumping liquids with a
density and viscosity corresponding to those of
water.
When pumping liquids with a density or viscosity
higher than that of water, the motor size should be
taken into consideration.
2. Type designation
The standard range of pumps encompasses com-
plete impeller in chamber combinations. Other
lengths, against duty combinations, can be supplied
by fitting empty chambers instead of standard cham-
bers with impellers.
The pump key on the pump nameplate indicates the
number of chambers and impellers fitted to the
pump.
2.1 Pump key
Before beginning installation procedures,
these installation and operating instruc-
tions should be studied carefully.
The installation and operation should also
be in accordance with local regulations
and accepted codes of good practice.
The pump must not be used for the trans-
fer of inflammable liquids such as diesel
oil, petrol or similar liquids.
TM03 3379 0306
Pos Description
1 Type designation
2 Model
3 Voltage 50 Hz
4 Full load current 50 Hz
5 Voltage 60 Hz
6 Full load current 60 Hz
7 System pressure / max. liquid temp
8 Power consumption 50 Hz
9 Nominal flowrate 50 Hz
10 Max. current 50 Hz
11 Nominal head 50 Hz
12 Max. head 50 Hz
13 Max. head 60 Hz
14 Nominal head 60 Hz
15 Max. current 60 Hz
16 Nominal flowrate 60 Hz
17 Power consumption 60 Hz
18 Insulation class
19 Enclosure class
Example MTC 4 - 50 / 3 A -W -A -AUUV
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
AUUE = optional with EPDM rubber
AUUV = Standard shaft seal
Type
A
A
P1
P1
CL
bar/°C
MAX
Model
50 Hz
60 Hz
p/t
1
1/1
1 1/1
V~
V~
W
Q
Q
A
A
H
96472495
m
m
m
m
H
H
MAX
H MAX
W
I
MAX
I MAX
IP
m /h
3
m /h
3
1
2
3
4
5
6
7
817
18 19
910
11
12
13
14
15
16

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3. Technical data
4. Installation
4.1 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.
Fig. 1
Fig. 2
Pump mounting flange dimensions:
4.2 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 bot-
tom of the strainer, the built-in priming screw will pro-
tect the pump against dry running.
Fig. 3 MTC 2 and 4
MTC 2 and 4 8, 12
and 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 IP 54 [TEFC]
The pump must be installed so that per-
sons cannot accidentally come into con-
tact with the hot surface of the motor.
TM00 1923 3297
Drain
channel
MTC 2 and 4
TM00 4375 5298
MTC 2 and 4 8, 12 and 16
D1 [mm] / [in] 140/5.51 180/7.09
D2 [mm] / [in] 160/6.30 210/8.27
D3 [mm] / [in] 180/7.09 200/8.27
L [mm] / [in] 121/4.76 100/3.94
C ¾" NPT 1 ¼" NPT
X [mm] / [in] 7/0.28 9/0.35
MTC 2 and 4 8, 12 and 16
A [mm] / [in] 37/1.1 40/1.6
B [mm] / [in] 22/0.9 25/1.0
TM00 4841 3897
L
c
4 x X
D1
D2
D3
BA
25 mm
25 mm
BA

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Fig. 4 MTC 8, 12 and 16
5. 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.
Motors up to and including 1.1 kW (2.0 hp):
The terminal box can be turned to four positions, in
90° steps, see fig. 5.
Proceed as follows:
1. Remove 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.
The electric motor should be connected to the supply
as shown in the diagram inside the terminal box
cover.
Fig. 5
Motors of 1.5 kW (2.0 hp) and up:
The terminal box has one fixed position.
6. Start-up
Fig. 6
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 rota-
tion.
4. MTC 2 and 4:
Open the discharge isolating valve a little.
Completely open the discharge isolating valve.
5. MTC 8, 12 and 16:
Loosen the air vent screw in the motor stool.
When a steady stream of liquid runs out of the
vent hole, tighten the air vent screw and com-
pletely open the isolating valve.
The pump has now been vented and is ready for
operation.
TM01 4326 5298
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.
TM00 4257 2294
25 mm
BA
25 mm
A
B
0˚
90˚
180˚
270˚
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 fig. 6.
TM02 0935 0401
Air vent screw

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7. Operation and maintenance
Note: The pump is not allowed to run against a
closed discharge valve for more than approx. 5 min-
utes as this will cause an increase in temperature/
formation of steam in the pump which may cause
damage to the pump.
7.1 Lubrication and maintenance
Pumps installed in accordance with these instruc-
tions 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 (5.0 hp) and up have angular con-
tact bearings.
7.2 Filters
Chip trays, filters, etc. should be cleaned at regular
intervals to ensure a correct flow of liquid.
7.3 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 pres-
sure.
• 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 symptoms with
section 10. Fault finding chart.
8. Service
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 servic-
ing.
Possible costs of returning the pump are to be paid
by the customer.
9. Sound pressure level
If a pump has been used for pumping
liquids which are injurious to human health
or poisonous, it will be classified as con-
taminated.
Do not turn the pump upside down during
service. Residual liquids from the cham-
bers may damage the motor.
Motor LpA [dB(A)]
[kW] [hp] 50 Hz 60 Hz
0.25 0.34 <70 <70
0.37 0.50 <70 <70
0.55 0.75 <70 <70
0.75 1.0 <70 <70
1.1 2.0 <70 <70
1.5 2.0 <70 71
2.2 3.0 <70 71
3.0 5.0 <70 71
4.0 5.0 73 71
5.5 7.5 73 78
7.5 10 73 78

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10. Fault finding chart
11. Disposal
Disposal of this product must be carried out accord-
ing 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, dispose the product according to local
regulations.
Before starting work on the pump, make sure that the electricity supply has been switched off and
that it cannot be accidentally switched on.
Fault Cause Remedy
1. Motor does not run
when started. a) Supply failure. Connect the electricity supply.
b) Fuses are blown. Replace fuses.
c) Motor starter overload has tripped out. Reactivate the motor protection.
d) Main contacts in motor starter are not
making contact or the coil is faulty. Replace contacts or magnetic coil.
e) Control circuit is defective. Repair the control circuit.
f) Motor is defective. Replace the motor.
2. Motor starter over-
load trips out im-
mediately when
supply is switched
on.
a) One fuse/automatic circuit breaker is
blown. Cut in the fuse.
b) Contacts in motor starter overload are
faulty. Replace motor starter contacts.
c) Cable connection is loose or faulty. Fasten or replace the cable connec-
tion.
d) Motor winding is defective. Replace the motor.
e) Pump mechanically blocked. Remove the mechanical blocking of
the pump.
f) Overload setting is too low. Set the motor starter correctly.
3. Motor starter over-
load trips out occa-
sionally.
a) Overload setting is too low. Set the motor starter correctly.
b) Low voltage at peak times. Check the electricity supply.
4. Motor starter has
not tripped out but
the pump does not
run.
a) Check 1 a), b), d) and e).
5. Pump runs but
gives no liquid or
pump capacity is
not constant.
a) Pump strainer partly blocked by impuri-
ties. Clean the strainer.
b) Liquid level in tank too low. Increase the liquid level.
c) Pump rotates in the wrong direction. Change the direction of rotation of the
motor.
Subject to alterations.

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