Davey HM Series Electric Pumps User Manual

Page 5

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Priming and Operation

The pump body and suction line should be filled by pouring water into the priming

plug hole adjacent to the outlet. Screw on the priming plug, close the discharge

valve two thirds and switch pump on. Gradually open the discharge valve and the

pipeline fills.

In high suction lift conditions, the pump may make a noise similar to it pumping sand

or gravel; this will usually be cavitation occurring. Reduce flow until the cavitation

noise stops. Once the discharge pipeline fills you can open the valve. If the

cavitation noise returns, close the discharge valve slightly until it stops.

In the case of installations where there is a positive suction pressure (flooded

suction) remove the pump’s priming plug and slowly open the gate valve in the

suction piping to allow water to enter the pump from the suction line until all air is

expelled. Replace the priming plug and fully open the gate valve in the suction line

and switch the pump on.

Prime should be established almost immediately, however, it may be necessary to

re-prime several times on some installations before fully established optimum pump

performance is obtained.

If pump runs but will not pump water, check for the following:

1. Suction line and pump body not filled with water.

2. Leaking foot valve.

3. Air leaks in suction lines.

4. Air trapped in suction line (even on flooded suction) possibly when there is an

uneven rise in the piping from water to pump (eliminate “humps and hollows”)

8

5

Three phase models with output power of 1.4kW and over have been designed to

allow for connection either side of the Capacitor Cover (marked “A” in figure one)

on the motor. (NOTE: Three phase motors do not have capacitors fitted in the

Capacitor Cover).

This is achieved by way of either of the two 19mm access holes (marked “B”

in figure one). The access holes are designed to accept most standard cable

grommets. The unused hole can be sealed by inserting the plug enclosed with the

pump. To connect a three phase Pressure Pump start by removing the Terminal

Cover (“C”)

In accordance with AS 3350.2.41 we are obliged to inform you that this pump is not

to be used by children or infirm persons and must not be used as a toy by children.

A short four core flex (“D”) is fitted from the motor terminals (“E”). This lead is

inserted through the blanking grommet (“F”).

Pressure switch or other control leads (“G”) can be fitted as well. Incoming power

(“H”) can be fitted through the preferred access hole, and terminated as shown in

Figure Three. A termination kit is available if required.

Insert the blanking grommet (“F”) into the capacitor

cover (“A”). Fix the short lead (“D”) into the path

provided in the non-drive endshield and replace the

terminal cover (“C”).

IMPORTANT NOTE: THREE PHASE MODELS ONLY

When the unit is connected and operating the phase balance should be checked.

This should be within 5% variation. “Rolling” the leads may help to improve a small

unbalance, but major phase unbalance will usually be attributed to an input power

unbalance. This must be addressed before the pump is used.

IP55 Compliant Connection

For some installations, such as wet areas in dairies, the pump is required to be IP55

compliant. The HM pump is IP55 compliant (models over 1.05kW are IP56).

3. Switch on.

4. Prime should establish almost

immediately with a strong

flow of water, however, in

some installations it may

be necessary to repeat

the above operation to

remove all air from the

system.

1. Ensure outlet nearest to

pump is open.

2. Fill pump body and suction line

through priming plug hole located

above suction inlet and replace plug.

Before finalising wiring connections, check that motor rotates in direction of

arrow (clockwise when shaft is viewed from wiring connection end except

HM270 models which rotate anti-clockwise). To alter rotation, change any

two power leads at motor terminals.

Power connections and wiring must be carried out by an Authorised

Electrician.

WARNING: Some insects, such as small ants, find electrical devices

attractive for various reasons. If your pump enclosure is susceptible to

insect infestation you should implement a suitable pest control plan.

Note: Minimum three phase voltage supply at the motor must not fall below

374 volts, otherwise motor damage may result which is not claimable under

Guarantee.

Do not run pump dry or allow to run continuously in a loss of prime

condition. If this pump is allowed to pump water containing sand or other

abrasive material, the effective life of the pump will be shortened.

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