Davey VM Series Stainless Steel Vertical Multistage Pumps - Manual (Page 3)

3
Altitude & Temperature vs Loss of Head
Altitude Loss of head Temperature Loss of head
0m 0m 20°C 0.20m
500m 0.60m 30°C 0.40m
1000m 1.15m 40°C 0.70m
1500m 1.70m 50°C 1.20m
2000m 2.20m 60°C 1.90m
2500m 2.65m 70°C 3.10m
3000m 3.20m 80°C 4.70m
90°C 7.10m
100°C 10.30m
The pump must be placed in a well drained
location or in a pan connected to a drain to
avoid water damage from leaking fittings,
seals etc.
Hydraulic connections
The diameter of the suction piping must never be less than that
of the pump.
Limit the length of the suction pipe and avoid all features that
cause losses of head (tapers, bends, etc.).
The suction pipe, which should slope upward slightly, must be
fully airtight, especially at fittings.
If a rigid pipe is used, provide supports or collars so that the
pump does not bear the weight of the pipe.
An arrow on the pump casing shows the direction of fluid flow.
Carefully seal the pipes with thread tape.
Electrical connections
continued overleaf...
NOTE: Disconnect pump from power
before undertaking ANY servicing or
clearance checks on the pump.
The electrical connections and checks
must be made by a qualified electrician and
comply with applicable local standards.
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.
Two standard cases for pump installations:
1. Pump in suction lift situation.
2. Pump installed with positive inlet.
Suction Lift: Pumps operate more efficiently with positive
suction. If the pump must be installed with a suction lift,
please ensure the suction line is kept as short as possible and
the pipe diameter is at least on size or larger than the pump
inlet. Suction line should be continuously rising from the water
source to the pump in order to avoid vapour locks.
For suction lift greater than 3 metres or suction distance
greater than 50m please contact Davey.
Positive Inlet: Recommended installation for efficient pumping.
Install the pump in a place that is easy to reach, protected from
frost, and as close as possible to the place from which water is
drawn.
Install the pump on a foundation block at least 100mm high and
attach via the holes for 12mm dia. studs. For heavy pumps,
provide a point of attachment above the pump centre line.
Place an insulating material (cork or reinforced rubber) under
the concrete block to avoid transmitting noise and vibrations to
the rest of the installation. Before final tightening of the anchor
bolts, make sure that the pump centreline is quite vertical; use
shims if necessary.
Motor specifications are typical and should be confirmed at
time of order.
Assembly for pumps supplied without motors fitted
Some Davey VM series multistage pumps require special size
motor bearings built into the motor which may not allow the use
of standard flange mounted motors.
To assemble the motor onto the pump, ensure that the motor
dimensions match the pump head dimensions.
Ensure the motor mounting face and shaft are clean and free
of debris. Lower the motor onto motor adaptor and secure
with four setscrews into the motor flange. Attach the coupling
halves onto the motor shaft and wet end shaft locating the
coupling onto the pump shaft pin. Secure the coupling with
four screws. Hand tighten only on the motor end and somewhat
tighter on the pump end to clamp the pump shaft. Ensure the
pump shaft and coupling will move as one up and down on
the motor shaft. Push coupling down as far as possible and
note it’s position. Raise the coupling up as far as possible and
mark this position. Set the coupling at the midpoint between
the top and bottom positions. Tighten all four coupling screws
evenly (tighten M6 coupling screws to 14Nm or M10 coupling
screws to 36Nm). Rotate the shaft and ensure it is free and
not rubbing. Run the pump for a short period and recheck the
pump still is free to rotate without interference.
Installation
Housing your Pump
To protect your pump from the weather, make sure the cover
provided is both water proof, frost free and has adequate
ventilation.
The pump should be vertically mounted on a firm dry base
allowing for drainage, to avoid damage to flooring.
Pumping direct from town water supply
must be in compliance with local
regulations.
The altitude of the installation and the
water temperature reduce the suction
capabilities of the pump.