DAYLIFF DHF Instructions d'installation

DHF

Horizontal High Flow Centrifugal Pumps

Installation &

Operating Manual

SPECIFICATIONS

SYMBOLS & WARNINGS 2

WIRING

INSTALLATION

TROUBLE SHOOTING

INDEX

Contents herein are not warranted

TERMS OF WARRANTY

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.

FLOW RATE (m /hr)

PUMP HEAD (m)

0 20 30 50 7060

10 40

DHF300

DHF200

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%

Max. Fluid Temperature: +40 C

Max. Ambient Temperature: +40 C

Max. Suction Lift: 7m at sea level

PUMP DATA

Model

Motor

Voltage

(V)

Dimensions (mm) Weight

(kg)

Power

(kW)

2.2

1.5 1x240

3x415

9.8

DHF300

DHF200

Current

(A)

3.5

207

238

259

313

369

392 25

DN1

(”)

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

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. 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.

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

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

• 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

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