Davey HM Series Electric Pumps - Manual (Page 5)

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.