DAYLIFF DHF Installation instructions

DHF
Horizontal High Flow Centrifugal Pumps
Installation &
Operating Manual

SPECIFICATIONS
1.
1
2.
SYMBOLS & WARNINGS 2
WIRING
3.
3
INSTALLATION
4.
3
TROUBLE SHOOTING
5.
5
INDEX
© Davis & Shirtliff Ltd 2023
Contents herein are not warranted
TERMS OF WARRANTY
6.
7

1
1. PUMP SPECIFICATIONS
Congratulations on selecting a Dayliff DHF High Flow Centrifugal Pumps.
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.
3
FLOW RATE (m /hr)
PUMP HEAD (m)
0 20 30 50 7060
5
25
10
10 40
15
DHF300
DHF200
20
PUMP
The Dayliff DHF series is a centrifugal non self priming closed impeller pump specially
designed for high flow commercial and industrial water supply uses in water boosting and
transfer applications. The pump body is cast iron with a brass impeller.
MOTOR
Pumps are close coupled to reliable TEFC electric motors designed for continuous
operation and are provided with a thermal cut out to protect against electrical overload.
Single phase pumps can be connected directly to the mains power supply through a 10A
fuse or MCB while three phase models require a remote DOL starter according to the local
regulations.
Enclosure Class: IP44 Insulation Class: F Speed: 2900rpm
OPERATING CONDITIONS
Pumped Liquids: Thin, clean, chemically non-aggressive liquids with max. sand content
of 0.25%
0
Max. Fluid Temperature: +40 C
0
Max. Ambient Temperature: +40 C
Max. Suction Lift: 7m at sea level

2
PUMP DATA
Model
Motor
Voltage
(V)
Dimensions (mm) Weight
(kg)
Power
(kW)
2.2
1.5 1x240
3x415
19
9.8
DHF300
DHF200
Current
(A)
3.5
W
207
238
H
259
313
L
369
392 25
3
2
DN1
(”)
3
2
DN2
(”)
2. INSTALLATION
Foot Valve
UPWARD SLOPE
TO SUCTION
Max 5m
Min 50cm
• Site in a dry, well ventilated and weather proof
location with an ambient temperature of no
0
more than 40 C.
ŸLocate on a solid flat surface ensuring the
shaft is in a horizontal position.
ŸEnsure 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 should be used,
though for maximum pump performance
suction height should be minimised.
ŸIf 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.
ŸEnsure that all suction pipe connections 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.

3
3. ELECTRICAL CONNECTIONS
WARNING
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:-
• All 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.
• Ensure that the power supply rating complies with the specification on the pump
rating plate.
• Electrical connections must be made according to details in the pump junction
box cover and effective earthing must be provided according to local
regulations.
• Single-phase motors are protected against overloads by a thermal
overload fitted in the motor windings.
4. PRIMING
FILL
WARNING
All non-self priming pumps 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 entered into the
system.
Serious damage will occur if a pump is not properly primed
and runs without water.

4
Never carry out any work on the pump without having rst
disconnected from the mains supply.
5. MAINTENANCE
WARNING
Pumps do not require routine maintenance provided the following precautions are
taken:-
• Check that the foot valve is clean and unrestricted at regular intervals.
• If 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.
• If 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.
6. TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
Motor won’t
start
Check connections and power
supply
See section on maintenance
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
No Power
Impeller stuck
Air in suction
Clogged foot valve
Delivery head exceeds pump capacity Reduce delivery head
Specify different pump

5
PROBLEM POSSIBLE CAUSE SOLUTION
Flow rate
insufficient
Reduce suction height
Clean foot valve and, if necessary
whole Intake pipe
Disassemble pump and carefully
clean pump body and impeller
Tripped motor
overload
Check voltage and ventilation
Release impeller
(See section on maintenance)
Foot valve partially clogged
Impeller blocked
Suction height at limit
Overheated motor
Impeller stuck

7. TERMS OF WARRANTY
i) General Liability
ii) Standard Warranty
7
• In lieu of any warranty, condition or liability implied by law, the liability of
Dayliff (hereafter called the Distributor) in respect of any defect or failure
of equipment supplied is limited to making good by replacement or
repair (at the Distributor 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 Distributor 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 Distributors reasonable control. Also, any repair
or attempt at repair carried out by any other party invalidates all
warranties.
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 two years - The item will be replaced or repaired at no
charge.
• Over two years, less than three 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.
Also proof of purchase including the purchase invoice must be provided for
a warranty claim to be considered

INS528A-03/23