DAYLIFF DBH 4-50 설치 및 운영 매뉴얼 - 페이지 7

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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.

3) 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

WARNING

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. Three phase motors should be

installed with remote starter.