Grundfos MTC Manuale utente

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.

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

bar/°C

MAX

Model

50 Hz

60 Hz

p/t

1/1

96472495

MAX

m /h

817

18 19

910

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

4 x X

25 mm

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

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

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

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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