DAYLIFF DB Installation instructions

DB & DBH
Horizontal Multistage Pumps
Installation &
Operating Manual
DB2 DB4
DB8 DB12
DBH

PUMP SPECIFICATIONS
1.
1
2.
INSTALLATION 2
ELECTRICAL CONNECTIONS
3.
3
PRIMING
4.
4
MAINTENANCE
5.
4
INDEX
© Davis & Shirtliff Ltd 2018
Contents herein are not warranted
TROUBLE SHOOTING
6.
5
WARRANTY
7.
6

1
1. PUMP SPECIFICATIONS
3
FLOW RATE (m /hr)
DB 4/60
DB 4/40
DB 4/30
12 3 456780
30
20
10
40
50
60
HEAD (m)
HEAD (m)
2468 12
3
FLOW RATE (m /hr)
DBH
EFFICIENCY % PUMP HEAD (m)
100
20
40
0
10
20
30
40
50
60
DBH8-30
DBH4-50
DBH2-40
DBH8-30
DBH4-50
DBH2-40
20
DB 2/50
DB 2/30
5
10
15
35
30
25
40
45
50
0.5 1.0 1.5 2.0 2.5 3.0 3.50
HEAD (m)
20
5
0
10
15
35
30
25
40
45
50
DB 8-50
DB 8-30
12 3 45678 9 10
HEAD (m)
20
2 4 6 8 10 12 14
5
0
10
15
35
30
25
40
45
50
55
DB 12-50
DB 12-30
DB2/DB4/DB8/DB12
3
FLOW RATE (m /hr)
3
FLOW RATE (m /hr) 3 FLOW RATE (m /hr)
Congratulations on selecting a Dayliff DB/DBH Pump. They are
manufactured to the highest standards and if installed and
operated correctly will give many years of efcient and trouble
free service. Careful reading of this Installation Manual is
therefore important, though should there be any queries they
should be referred to the equipment supplier.

2
PUMP
The Dayliff DB/DBH range of horizontal multistage centrifugal pumps are
designed for continuous duty in various water transfer duties with particular
application in pumping slightly corrosive liquids. The pump has small
physical dimensions, axial suction port and radial discharge and is base
plate mounted. DB suction chamber and pump head are made of grey cast
iron while the impeller and impeller housing are of stainless steel. DBH pump
body, suction and discharge ports are made from AISI 316 stainless steel as
is all the other parts in contact with the pumped liquid. The mechanical seal is
made from silicon carbide designed for easy replacement. Both pump and
continuously rated motor unit are of monoblock design and particular
attention has been paid to quietness and smooth operation.
MOTOR
The pump is coupled to a totally enclosed, fan cooled single phase squirrel-
cage motor with built in thermal overload protection suitable for continuous
duty. The motor can be connected to a power outlet fuse or MCB and
protection must be provided.
Enclosure Class:DB2/4 & DBH - IP54, DB 8/12 - IP44
Insulation Class: F
Voltage:1x220-240V, 3x380-415 (DB8-50, DB12-50)
Speed:2900rpm
OPERATING CONDITIONS
Pumped Liquid: DB - Thin, clean, non-aggressive and non-explosive
liquids solid particles.
DBH - Thin, clean, slightly aggressive but non-explosive liquid without solid
particles or fibres.
0 0
Liquid Temperature: 0 C - 110 C
0
Max. Ambient Temperature: +40 C
Max. Suction Lift: According to NPSH curve plus a safety margin of 1
0
Max. Operating Pressure: 10 Bar up to 40 C
0
6 Bar up to 90 C

0.37 4 1" 132 255 403 10
6 1¼” 204 441 12
12 1½” 178 267 514 22
DBH 2-40
0.75
1.5
DBH 4-50
DBH 8-30
DB Cross Sectional Diagram
142
140
480
680
820
1020
1450
1710
1080
2700
1500
3
PUMP DATA
Model Current
(A)
Dimensions(mm) Weight
(kg)
DNA C H L1
B
Power
(W) DNB A
DB 2-30 2.3 12
DB 2-50 3.2 11
3.5
DB 4-30 12
4.3DB 4-40 13
DB 4-60 6.2 15
18
29
19
27
DB 8-30
3.4
5.1
DB 8-50
DB 12-30
4.8
6.8
DB 12-50
2) INSTALLATION
! Site in a dry, well ventilated and weather
proof location with an ambient
0
temperature of no more than 40 C.
! Locate on a solid flat surface ensuring the
shaft is in a horizontal position.
! Ensure that the diameter of the suction
pipe is at least the size of the pump
suction inlet. If the suction depth exceeds
4 meters then a one size larger diameter pipe. If the suction depth
exceeds 4 meters then a one size larger diameter pipe should be used,
though for maximum pump performance suction height should be
minimised.
Foot Valve
UPWARD SLOPE
TO SUCTION
Max 6m
Min 50cm
1"
1"
1¼”
1¼”
1¼”
1¼”
1½”
1½”
1¼”
119
155
137
164
218
138
108
138
108
130
130
130
130
130
130
130
130
130
141
141
141
141
141
181
181
181
181
228
228
228
228
228
248
248
248
248
327
363
344
372
465
420
390
450
390
B1
H
B
L1
DNB
A
DNA
H
DBH Cross Sectional Diagram
C
DNB
C
A
DNA
H
BL1

4
3) ELECTRICAL CONNECTIONS3) ELECTRICAL CONNECTIONS
The installer is responsible for making electrical connections
to the mains supply in compliance with relevant local
regulations. Ensure that a professional electrician carries out
the electrical connections and that the following guidelines
are followed:-
ŸAll installations must be provided with an isolator to cut off mains power
supply and coarse current protection in the form of a fuse or MCB rated
at 2-3 times the full load current as given on the pump plate.
ŸEnsure that the power supply rating complies with the specification on
the pump rating plate.
ŸElectrical connections must be made according to details in the pump
junction box cover and effective earthing must be provided according to
local regulations.
ŸSingle-phase motors are protected against overloads by a thermal
overload fitted in the motor windings. Three phase motors should be
installed with remote starter.
WARNING
! If there is negative suction (i.e the pump is above the suction water level)
the suction pipe must be slightly angled upwards towards the pump inlet
to avoid the formation of air locks. It must also be immersed in water by
at least 0.5m to avoid the formation of vortexes and a good quality foot
valve must be fitted.
! Ensure that all suction pipe connection are completely airtight or else the
pump will not operate.
! The diameter of the delivery pipe must be chosen to suit the flow rate and
pressure required at the delivery point though must not be smaller than
the pump outlet size. It is also advisable to fit a non-return valve and
isolating valve on the delivery outlet.
! This measure is essential if the delivery pressure exceeds 20 meters.
! The pipes must be fitted using suitable brackets to avoid transmitting
stress to the pump body. Take care not to cause damage by over
tightening the pipes during fitting.

5
5. MAINTENANCE
WARNING
Pumps do not require routine maintenance provided the following
precautions are taken:-
ŸCheck that the foot valve is clean and unrestricted at regular intervals.
ŸIf the pump is to remain unused for long periods of time it is advisable to
empty it completely, rinse it with clean water and store in a dry place.
ŸIf the shaft does not run freely, release it using a screwdriver by inserting it
in the special slot on the rear of the pump shaft. If this is not sufficient to
solve the problem remove the pump body by unscrewing the relevant
mounting bolts and clean it thoroughly to remove any encrustation.
Never carry out any work on the pump without having first
disconnected from the mains supply.
Serious damage will occur if a pump is not properly primed
and runs without water.
4) PRIMING
WARNING
The pump must be primed before operation. To do this completely fill the
pump housing with clean water through the priming plug before switching it
on.
When full replace the priming plug and start the pump checking there is a
steady flow at the pump outlet. The pump should be primed whenever it has
not been used for a long period of time or when air has made its way into
the system.

6
6. TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
Motor won’t
start
Check connections and power
supply
No Power
See section on maintenance
Impeller stuck
Motor turns
without
pumping Move pump closer to water level
Check suction pipe is airtight
Make sure foot valve is immersed
by at least 50cm
Pump needs to be primed
Clean foot valve
Excessive suction height
Air in suction
Clogged foot valve
Delivery head exceeds pump capacity Reduce delivery head
Specify different pump
Flow rate
insufficient
Reduce suction height
Clean foot valve and, if necessary
whole Intake pipe
Disassemble pump and carefully
clean pump body and impeller
Foot valve partially clogged
Impeller blocked
Suction height at limit
Tripped motor
overload
Check voltage and ventilation
Release impeller
(See section on maintenance)
Overheated motor
Impeller stuck

7
ii) Standard Warranty
General Terms
If equipment failure occurs in the normal course of service having been
competently installed and when operating within its specified duty limits
warranty will be provided as follows:-
• Up to one year - The item will be replaced or repaired at no charge.
• Over one years, less than two years - The item will be replaced or
repaired at a cost to the customer of 50% of the Davis & Shirtliff
market price.
The warranty on equipment supplied or installed by others is conditional
upon the defective unit being promptly returned free to a Davis &
Shirtliff ofce and collected thereafter when repaired. No element of site
repair is included in the warranty and any site attendance costs will be
payable in full at standard chargeout rates.
7. TERMS OF WARRANTY
i) General Liability
• In lieu of any warranty, condition or liability implied by law, the liability of
Davis & Shirtliff (hereafter called the Company) in respect of any defect
or failure of equipment supplied is limited to making good by
replacement or repair (at the Company's discretion) defects which
under proper use appear therein and arise solely from faulty design,
materials or workmanship within a specified period. This period
commences immediately after the equipment has been delivered
to the customer and at its termination all liability ceases. Also the
warranty period will be assessed on the basis of the date that the
Company is informed of the failure.
• This warranty applies solely to equipment supplied and no claim for
consequential damages, however arising, will be entertained. Also
the warranty specifically excludes defects caused by fair wear and tear,
the effects of careless handling, lack of maintenance, faulty installation,
incompetence on the part of the equipment user, Acts of God or any
other cause beyond the Company's reasonable control. Also, any repair
or attempt at repair carried out by any other party invalidates all
warranties.

8
Also proof of purchase including the purchase invoice must be provided for
a warranty claim to be considered.

INS179E-05/18