Specifications; Installation - WilTec 50253 Manual

Specifications

This manual has been conceived to offer the user adequate information on the installation, operation
and maintenance of our electro pumps. We suggest you read
it thoroughly. These are centrifugal horizontal electro pumps, with self-priming capacity and supplied
with Ventury system so to reach suctions of up to 8 mts. Connect a foot valve and the pump will get an
immediately self-priming. They have been designed to operate with clean water at a maximum tem-
perature of 35. Operating with any kind of water, other than that just described, should be avoided.
These pumps have been built with first quality materials, submitted to strict hydraulic and electric con-
trols and verified thoroughly. Following these present instructions and the electrical chart, will help you
to achieve a correct installation. Failure to do this could result in motor over-charge and any other
consequences, which we wish to be relieved of.

Installation

The electro pumps must be placed as near as possible to the water level in order to obtain the mini-
mum suction lift and reduce the loss of head. If the installation is to be permanent, pump should be
attached to the floor or ground using the holes in the pump bracket. They should be installed in dry
placed and safe from any possible flooding.
Pipe assembly
The suction pipe must be resistant to depression and be kept submerged 30 cms below water level to
prevent the formation of whirls and its inevitable consequence: Air leaks. If suction lift is over 7 mts,
the use of a pipe of a bigger diameter than the admission port of the pump is recommended. The un-
ions or connections must be absolutely watertight. It is recommended to reduce pipe bends to the
minimum possible. Make sure that the complete suction pipe has a minimum inclination of 2%.
The discharge pipe should have a diameter equal or bigger than that of the pump outlet. In any case
should the suction or discharge pipe rest on top of the pump.
Electrical connection
The electric installation should be provided by a system of multiple separations with contact openings
of at least 3 mm. The protection of the system will be made by a differential switch (Ifn=30 mA.)The
electric cable must correspond to the EEC (2) norm or to the type H07 RN-F according to VDE 0620.
The single phase motors have a built-in thermal protection.
Controls prior to the initial starting
1. Check that the tension and frequency of the electric supply correspond to that indicated on the
technical characteristics label.
2. Make sure that the shaft rotates freely.
3. Fill pump body with water, unscrewing slightly the priming plug.
4. Verify the motor sense of rotating as indicated on the fan cover.
5. THIS PUMP SHOULD NEVER BE DRY OPERATED.
Starting
- Open all gate valves installed in the suction and discharge circuits.
- Connect the electric supply switch and wait for the priming to be completed. If a foot valve has been
installed, the priming will be instantaneous.
- Verify the motor sense of rotating is clockwise, checked from the fun cover (Fig.2).
- If motor fails to start or does not deliver water, refer to our "Trouble Shooting" list with the possible
problems and consequent actions to take. This information will be found on the next pages.
© by WilTec Wildanger Technik GmbH Seite 7
http://www.wiltec.info