Texmo Industries Taro Pumps NMH 7040 Parts list manual

Non-Clog
Sewage
Pumps
Instruction &
Operating Manual
OMSP001A 2020.01

OMSP001A 22020.01

Table of Contents
1. Introduction
2. Warranty information
3. Complying with standards
4. Contents in the packing box
5. Information about your pump
6. Schematic drawings
7. Key product specifications & features
8. Cross-section view
9. Pre-installation requirements
10. Installation procedures
11. Basic troubleshooting
12. Preventive maintenance checks
13. Do’s and don’ts
14. Important safety instructions
15. Storage & handling
16. Company contact information
OMSP001A 32020.01

1. Introduction
2. Warranty
information
3. Complying
with standards
Thank you for choosing a quality product manufactured
by Texmo Industries. We request you to read this
manual carefully to ensure that the system you have
purchased will be operated correctly.
This manual is intended to provide you with information
on your product and information on installation and
operation. You will also find information on how you
could contact Texmo Industries, should you need further
information or help and support.
Please refer to your warranty card or visit
www.taropumps.com for more information on
your warranty.
IS 996: Single Phase a.c. Induction Motors for
General Purpose
IS 3043: Code of Practice for earthing - Specification
IS 4029: Guide for testing three - phase motors
IS 7538: Three Phase Squirrel - cage Induction Motors
for Centrifugal Pumps for Agricultural
Applications - Specification
IS9079: Electric Monoset Pumps for Clear cold water for
Agricultural and Water Supply Purposes -
Specification
IS13730: Specifications for Particular Types of
Winding Wires
OMSP001A 42020.01

4. Contents of the
packing box
Based on model you have purchased, your Non-clog
Sewage Pump is packed along with instruction manual
and warranty card in either a corrugated box or in a
wooden crate.
5. Information about your pump
Taro Non-clog Sewage Pumps are manufactured using
high quality raw materials and components using
state-of-the-art manufacturing facilities and will give
trouble-free performance if they are properly installed
and maintained. The Non-clog Sewage Pumps are
centrifugal pumps with inbuilt self-priming mechanism.
After installation, once the pump casing is filled
initially with the pumped liquid, the pump is ready to
use. The specialty of such pumps is that they permit
the pumping out of mud, dirt, and suspended solids.
These pumps are suitable for handling water and non-
corrosive liquids.
The self-priming action of the pump works on the
principle of diffusion. After installation, the pump
casing is completely filled with the pumping liquid
which is retained by the flap valve assembly. When
the pump is started, the flap valve opens and air
from the suction pipe is mixed with the casing liquid.
The mixture of air and liquid is transferred into the
larger casing outside the pumping chamber and air
escapes into the delivery branch from there. This
process continues until all the air in the suction line is
eliminated and the pump works as a centrifugal pump.
Non-clog Sewage Pumps find wide application for
Pumping of sewage and effluents in Bungalows,
Apartments, Office,Public Buildings, Schools,
Hotels, Restaurants and Hospitals, Water recycling
plants,Pumping of surface rain water,De watering of
trenches and pits.
Prior to installation, read this manual thoroughly and
follow the instructions for installation and maintenance
of our Non-clog Sewage Pump to ensure reliable
operation. The pump should be installed by technically
qualified personnel in compliance with national and
local electrical codes and as per our instructions
in order to avoid electrical shocks, unsatisfactory
performance, and / or equipment failure.
OMSP001A 52020.01

6. Schematic drawing
View of a Non-clog Sewage Monoblock is shown below in Fig. 1:
Fig. 1 View of Non-clog Sewage Monoblock
OMSP001A 62020.01

7. Key specifications & features
Standard Specification of Monoblock is shown below in TABLE 1:
Phase and Power
Single Phase – 2 Pole: 1.0, 2.0 HP
Three Phase – 2 Pole: 1.0, 2.0, 3.0 HP
Three Phase – 4 Pole: 5.0 HP
Motor Type Dry
Starting method Single phase : CSR
Three phase : DOL
Operating Voltage Single phase : 350 - 440 V
Three phase : 180 - 240 V
Frequency 50 Hz
Speed
2P: 2850 rpm
4P: 1440 rpm
Duty S1 Continuous
Insulation Class Refer name plate
Max. Fluid Temperature 330C
Impeller Type Semi Open
Type of Enclosure TEFC
Thermal Overload Protection (TOP) Provided for Single-phase pumps
OMSP001A 72020.01

Key features: Motor
The motor houses shielded type Deep Groove Ball Bearings pre-filled with grease, to take up the
radial and axial thrust loads
The rotors are dynamically balanced
Adequate motor surface area is provided for effective cooling
To protect the single-phase pump from overload, Thermal Overload Protector (TOP) is provided
NMH SERIES - THREE PHASE NON-CLOG SEWAGE MONOBLOCKS
Approximate performance values of NMH series at 415 V (-15% to +6%), 50 Hz, AC power supply
NCH SERIES - THREE PHASE NON-CLOG SEWAGE COUPLED SET
Approximate performance values of NCH series at 415 V (-15% to +6%), 50 Hz, AC power supply
Model
Name
Motor
Rating
Pipe Size
(mm)
Total Head Values
SHP in mm
Power
consump.
Max.
Metres 6 7 8 9 10 11 12 12.5 13 14 15 16 18 20 22 24
KW HP Suc. Del. Feets 20 23 26 30 33 36 39 41 43 46 49 52 59 65 72 78
NMH 7040 ¤ 0.75 140 40
Discharge value
in l/s
4.4 4.2 3.9 3.6 3.2 2.8 2.2 1.8 1.4 0.6 7
NMH 1550 ¤ 1.5 250 50 76.8 6.5 6.2 5.8 5.4 4.8 4.5 4.2 3.4 2.4 1.4 9
NMH 2250 2.2 350 50 7.5 7.5 7.4 7.3 7.3 7.2 76.8 6.4 5.5 4.2 2.6 10
Model
Name
Motor
Rating
Pipe Size
(mm)
TOTAL HEAD VALUES
SHP in mm
Power
consump.
Max.
Metres 6 7 8 9 10 11 12 13 14 15 16 18 20 22 24 26
KW HP Suc. Del. Feets 20 23 26 30 33 36 39 43 46 49 52 59 65 72 78 85
NCH 2250 2.2 350 50
Discharge
value in l/s
7.5 7.5 7.4 7.3 7.2 76.8 6.4 5.5 4.2 2.6 1.05 10
NCS 3775 3.7 575 75 22.4 20.2 19.1 17.9 15.4 12.5 8.9 4.5 2.1 15
Product performance data are provided in TABLE 2 below:
Performance confirming to IS : 9079 ¤ - Singel phase version also available SHP - Solid handling particle size
PRODUCT TYPE KEY
N M H - S 15 50 - Non clog Sewage Monoblock High speed - Single phase (15 - Power code, 50 - Delivery pipe size)
N C H 22 50 - Non clog Sewage Coupled High speed (22 - Power code, 50 - Delivery pipe size)
N C S 37 75 - Non clog Sewage Coupled Slow speed (37 - Power code, 75 - Delivery pipe size)
Product Performance Specification
OMSP001A 82020.01

The pump is designed with semi-open impeller to prevent clogging of the impellers during
pumping
A small clearance is maintained between the impeller blade surface and the replaceable wear
plate so that high heads can be developed
The pump by virtue of its design does not require a foot valve.
The impeller is dynamically balanced
Water slinger provided to prevent water entry into the front bearing
Stainless steel sleeve within the stuffing box provides additional protection to the shaft
Key features: Pump
For single phase pumps, simply connect the supply to the two terminals
For three phase pumps, connect the three wires from the Direct On-Line starter to the three
terminals on the motor
Electrical Connection
OMSP001A 92020.01

8. Cross-section view
No. PART NAME
1 Stud & Hex Nut
2Flange Square
3 Hexagon Head Bolt
4 Drain Cover
5Gasket - Irregular - Drain
Cover
6 Hexagon Nylock Nut
7Wear Plate
8Csk Head Hex.Socket
Screw
9 Parallel Key
10 Stud & Hex Nut
11 Mechanical Seal
12 Water Slinger
No. PART NAME
13 Hex Head Bolt
14 C.H Screw
15 Terminal Box
16 Body
17 C.H Screw & Spring Washer
18 Fan Shield
19 Fan
20 Split Cotter Pin
21 Rear Cover
22 Deep Groove Ball Bearing
23 Shield
24 Rotor With Shaft
25 Hexagon Head Bolt
26 Cap
No. PART NAME
27 Deep Groove Ball Bearing
28 Cover Dome
29 Casing
30 Gasket Circular
31 Gasket Square
32 Hex Stud & Nut
33 O-Ring
34 Drain Plug
35 Stud & Hex Nut
36 Hammer Drive Screw
37 NRV Disc Face
38 NRV Flap
39 Washer
Cross-section view of single phase Capacitor Start and Run High Speed Monoblock is shown below in Fig. 2:
Fig. 2 Cross-section view of a Non-clog Sewage Monoblock – NMH 7040 / NMH 1550
31
35
4
3
1
37
3839 34
2
28
6 8 15
11 12 16
2122
23
17
14
13
27 26 24
9
20
10
30
7
36 25
29
33
18
19
32
5
OMSP001A 10 2020.01

Cross-section view of a three-phase Non-clog Sewage Monoblock set is shown below in Fig. 3:
Fig. 3 Cross-section view of a Non-clog Sewage Monoblock – NMH 2250
No. PART NAME
1Flange Square
2Gasket Square
3 Hex Head Bolt & Nut
4 Flange Cum Nrv Seat
5Drain Plug
6 Nrv Disc Face - Swing
7 Nrv Disc Face - Fixed
8Casing
9 Hex Nylock Nut
10 Parallel Key
11 Hex Head Bolt
12 Mechanical Seal
13 Water Slinger
14 Body
No. PART NAME
15 Rotor With Shaft
16 Support For Body
17 C.H Screw & Spring Washer
18 Split Cotter Pin
19 Fan Shield
20 Fan
21 Rear Cover
22 Deep Groove Ball Bearing
23 Coil
24 Stator Stack
25 Hex Socket Set Screw
26 Eye Bolt
27 Gasket
28 Terminal Box
No. PART NAME
29 Terminal Box Cover
30 Terminal Board
31 Cap
32 Cover Dome
33 Gasket Circular
34 Impeller
35 Washer
36 Wear Plate
37 CSK Head Hex.Socket
Screw
38 Hex Head Bolt & Nut
39 Washer
40 Stud & Hex Nut
1234678 9 10 11 12 13 14 15 16 17
1920
21
18
23
24
2526
27
2829
30
32
333435
36
37
39
40
5
38 22 31
OMSP001A 11 2020.01

No. PART NAME
1Flange Square
2Gasket Square
3 Hex Bolt & Nut
4 Stud & Hex Nut
5 Plug - 1/2" Bsp
6 Plug - 1-1/2" Bsp
7 Hex Bolt
8 Casing - NCH 2250
9Hexagon Nylock Nut
10 Washer
11 Impeller
12 Parallel Key
13 Sleeve
14 Gland
15 Hexagon Nut
16 Base Plate
17 Lock Nut
18 Hex Head Bolt
19 Circlip
20 C.H Screw
21 Terminal Box
No. PART NAME
22 C.H Screw & Washer
23 Deep Groove Ball Bearing
24 C.H Screw And Spring Washer
25 Fan Shield
26 Fan
27 Split Cotter Pin
28 Rear Cover
29 Rotor With Shaft
30 Stator Stack
31 Hexagon Socket Set Screw
32 Eye Bolt
33 Body
34 Coil
35 Cap
36 Front Cover
37 Deep Groove Ball Bearing
38 Cap
39 Parallel Key
40 Love Joy Coupling Set
41 Spider
42 Hex Head Bolt & Spring Washer
No. PART NAME
43 Cap
44 Deep Groove Ball Bearing
45 Bearing Bracket
46 Shaft
47 Deep Groove Ball Bearing
48 Sheild
49 Water Slinger
50 Square Bolt
51 Gland Packing Rope
52 Lantern Ring
53 Grease Cup
54 Plain Washer
55 Gasket Circular
56 Wear Plate
57 Plug - 1/2" Bsp
58 CSK Head Hex. Socket Screw
59 NRV Disc Face - Fixed
60 NRV Flap
61 Gasket Square
62 Flange Cum Nrv Seat
63 Washer
Cross-section view of a three-phase Non-clog Sewage Coupled Pump is shown below in Fig. 4:
Fig. 4 Cross-section view of a Non-clog Sewage coupled set
57 56
5
60 59
2
1349
39 38 37 36 35 34 33 3132 30 29 28
21 22
23
24
54 53 52 51 50 49 48 47 46 45 43 42 40
41 27
17
13 14
7
26
16
6
63
12
44
8
62 58
2019
61
18
15 25
55
11
10
OMSP001A 12 2020.01

9. Pre-installation requirements
Arrangement for Installation
General Installation Precautions
Open the packaging and note down the Serial number and Model for future reference
Ensure all fasteners are tightened properly
Use prescribed pipe sizes as mentioned on the product name plate
Use a quality foot valve with strainer to ensure proper priming
Immediately on installation, prime the set before starting the pump
Do not install the pump with high static suction lift
It is recommended to install the pump on a level base with foundation bolts to prevent the pump
and piping from getting stressed
Use a single power cable for three phase from the pump to the starter. It is not recommended to
use a power cable with large number of joints as this can result in a significant voltage drop
While installing the pump, ensure the pump is not subject to shock loads which can damage the
pump parts
As the pump is air cooled, ensure that air flow to the cooling fan, located at the rear side of the
motor, is not blocked
Leakage past the gland is necessary to ensure that the heat generated due to friction
between the rotating sleeve and stationary packing rope is carried away. About 20 drops / minute
is normal
Engage a professional and trained mechanic with experience in erecting Non-clog Sewage
Pumps
Ensure proper safety precautions during installation
Ensure that a level foundation is ready before erection of the pump. Contact the dealer from
whom the pump was purchased for the motor mounting details for preparing the foundation
Use appropriate lifting equipment during installation.
OMSP001A 13 2020.01

Note
If you detect damage or discrepancy in the product, contact the dealer from
whom the pump was purchased
Warning
Do not use this pump for oil or toxic, acidic, corrosive, and flammable liquids.
Pumping flammable liquids could cause explosion
Caution
Use appropriate equipment for lifting / lowering the pump. Ensure suitable
precautions are taken while lifting and lowering the product
Caution
Use trained professionals to install the pump
Warning
Use a power supply cable that has sufficient rating. Factor in low-voltage
operation
Warning
Provide proper Earthing as improper Earthing can cause electrical shock
Caution
Do not place the pump in a location subject to flooding as water can enter the
motor and damage the windings and bearings
Warning
Mount the pump with its axis horizontal
Note
It is recommended to use a starter for three phase models
OMSP001A 14 2020.01

Caution
The shaft of the pump passes through a gland and stuffing box arrangement.
Do not attempt to run the pump dry as the sleeve / oil seal can get damaged
during dry rotation. Ensure the pump is primed first and then run it
Warning
Switch OFF the power before working on electrical lines
Caution
Do not use this pump for pumping liquid exceeding 330C as this may lead to
product failure
Warning
Do not switch ON the pump if there is any human contact with the pumped
medium. If any electrical leakage occurs, this could be fatal
Note
For three phase models use a starter
Operation Precautions
OMSP001A 15 2020.01

Caution
The supply voltage should be within the specified voltage range. Water
temperature for operation of the pump should not exceed 330C. Failure to
observe the precautions given above could cause the pump to malfunction and
may lead to current leakage or electrical shock
Warning
If you find any abnormalities like vibration, noise, smell, etc. from the pump
during trial operation, switch OFF the pump and contact the dealer from whom
this pump was purchased
10. Installation procedure
Please follow the below procedure to install the pump.
The following steps are executed prior to installation
Installation:
Measure the Insulation Resistance using a Megger of 500 VDC
Ensure contact points are clean
Connect the measuring cable to the ground conductor
Connect the other measuring cable to every core of the motor cable in succession
Ensure that the insulation resistance as shown on the Megger is a minimum of 20 mΩ
Prepare a level concrete foundation for mounting the pump and tighten the motor base using the
foundation bolts as shown in Fig. 5 below:
OMSP001A 16 2020.01

Fig. 5 Non-Clog Sewage Pump on a concrete foundation - installation
EARTH SCREWS
CONCRETE BASE
FOUNDATION
DRAIN PLUG
BOLT & NUT
SUPPORT
FILLING PLUG
DELIVERY FLANGE
SUCTION FLANGE
DRAIN COVER
FOUNDATION BOLT & NUT
CONCRETE BASE
EARTH SCREWS
FILLING PLUG
CONCRETE BASE
FOUNDATION BOLT & NUT EARTH SCREWS
BASE PLATE
DRAIN PLUG
FILLING PLUG
(a) NMH 7040 / NMH 1550
(c) NCH 2250 / NCS 3775
(b) NMH 2250
OMSP001A 17 2020.01

Use as few pipe fittings as possible in the suction line
Remove the filling plug and pour water, as shown in Fig. 7 below into the casing until it overflows
Replace the filling plug and tighten it
Use prescribed pipe sizes as mentioned on the product name plate
Place the pump centre line as close as possible to the water surface and with the free end of the
suction pipe fixed above the bottom of the well. Refer Fig. 6, shown below, for recommendations:
Fig. 6 Recommendations for
locating the pump and
foot valve
Fig. 7 Priming arrangement for Non-Clog Pumps
During priming, check the pump suction pipe for
leakages.
Preferably ≤ 3m
SUCTION PIPE
SUPPORT FOR
SUCTION PIPE
GL
FILLING PLUG
JAR
FUNNEL
OMSP001A 18 2020.01

Fig. 8 Preferred orientation of suction pipe for Non-Clog Pumps
Ensure that the suction pipe connected to the pump suction flange is horizontal or sloping
upwards towards the pump suction flange to prevent air lock. A pipe sloping downwards towards
the pump suction flange will result in air lock. Refer Fig. 8, shown below, for the preferred suction
pipe orientation.
Horizontal suction pipe Suction pipe inclined up
towards pump suction
Suction pipe inclined down
towards pump suction
Checking direction of rotation of Non-Clog Pumps
Danger
Hazardous voltage will cause death, serious injury, electrocution.
All electrical work must be performed by an authorised electrician, in compliance
with local electrical equipment standards and internal wiring codes.
Ensure pump is primed
For three phase connect the pump to the starter and power up the pump
Check the direction of rotation of the motor shaft
If the direction of rotation is in the same direction as that marked on the casing, the connections
are right
For Single Phase products in case the direction of rotation of the motor shaft does not match the
marking on the casing, bring this to the notice of the dealer from whom the purchase was made
and get the set repaired
For Three Phase products in case the direction of rotation of the motor shaft does not match the
marking on the casing, interchange any two lead wires at the starter and confirm the direction of
rotation as before
OMSP001A 19 2020.01

Electrical wiring work
Earthing
Warning
All electrical work must be performed by an authorised electrician in compliance with
local electrical equipment standards and internal wiring codes. Improper wiring can
lead to current leakage, electrical shock, or fire.
Warning
Be sure to install the ground wire securely. Failure to observe this
precaution could damage the pump and cause current leakage, which may
lead to electrical shock
Caution
Do not connect the ground wire to a gas pipe, water pipe, lightning rod, or
telephone ground wire. Improper grounding could cause electrical shock
Electrical Installation
Check the power supply voltage and frequency and compare with the product requirements
specified on the nameplate
Observe relevant EB regulations while providing power supply to the motor
As far as possible, do not use multiple joints in the electrical cabling while connecting the starter
to the pump
Ground the pump using the two earth screws provided on the leg of the motor body
Ensure electrical joints, if any, are properly and adequately insulated
Connect the cable properly to the starter terminals to avoid loose connections
Factor in low-voltage operation while selecting cable size
OMSP001A 20 2020.01