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HWE 71
Инструкция по эксплуатации Страница: 11

Homa HWE 71 [11/20] Electrical connection

6. Electrical Connection

Before operation, an expert check must secure that the

required electrical protection measures exist. The connec-

tion to ground, earthing, isolating transformer, fault current

breaker or fault voltages circuit must correspond to the

guidelines set forth by the responsible power plant.

The voltage required in the technical data sheet

must correspond to the existing line voltage.

Make sure that the electrical pin-and-socket connec-

tions are installed flood- and moisture-safe. Before starting

operation check the cable and the plug against damages.

7. Installation

A permanent installation of the pump is only allowed in

under cover rooms which are ventilated. The max. room

temperature is 40°C.

To prevent the pump or pump control from being dam-

aged by contamination we generally recommend that a pre-

filter be fitted.

Before a start-up of the pump the suction pipe and the

discharge pipe must be installed.

The operator has to prevent damage through the flood-

ing of rooms caused by defects of the pump through the

use of appropriate measures (e.g. installation of alarm

units, backup pumps or like that).

7.1 The suction pipe

The suction pipe transports the clear water from the well to

the pump. As a suction pipe you can use the HOMA suction

kit (available in the length 4 m or 7 m) with reinforced hose,

22 mm Ø, foot valve and pump connector. For other length

or other diameters see HOMA accessory-program.

The suction pipe normally consists of the following parts:

- Hose spigot or half suction

coupling and fixed coupling

- Hose bands

- Reinforced hose

¾" bis 1¼"

- Hose bands

- Hose spigot

By using a fixed coupling at the suction side of the pump

you must use a readjustable half suction coupling (never

use a second fixed coupling) to guarantee an absolute

tightness of the suction pipe. Furthermore each thread must

be isolated by teflon. A suction pipe which is not airtight

suck in air and obstruct suction of water.

Instead of using a hose you can install a threaded pipe.

Please pay attention to the above mentioned rules. In any

case a foot valve with strainer must be installed at the end

of the suction pipe. If not the suction pipe will run out of

water during non-operation of the pump. When you restart

the pump the suction pipe must be filled before pumping

water. By using the pump with pre-compression for boosting

a check valve must be installed in the suction pipe.

7.2 Length of the suction pipe

The length of the suction pipe consists of a vertical and a

horizontal part. The vertical part between pump and water

surface is called suction height. The max. suction height

is 8 m. The suction height might be reduced when there is

a large distance between water intake and pump. A reason

for that is the horizontal suction pipe length which caused

friction loss. Please choose the lentgh of the suction pipe in

that way that the end of the suction pipe is 30 cm below the

water surface in the well.

7.3 Installation of the suction pipe

Connect the suction pipe at the pump inlet (Pos. A). To

reduce the first priming process of the self-priming pump we

recommened to fill up the

suction pipe with clear –

water before you install the

suction pipe. In any case

you must completely fill up

the pump housing through

the discharge connection

(Pos. B) or the fill-up opening

(Pos. C). Viewed from the

pump suction side, the pipe

must be layed constantly

drooped without any loops.

7.4 The discharge pipe

The discharge pipe transports the water from the pump to

the tap or sprinkler. Under normal operation conditions a

hose diameter of ½“ at the discharge side is enough. To

increase the pressure and the water output at the end of the

discharge pipe please choose a larger diameter of the dis-

charge pipe, max. 1¼“.

Seal up the male threads with teflon (fixed-coupling, hose

spigot, pipe) and connect the pipe to the discharge (Pos. B).

Check the water level in the pump housing again and fill up

the pump housing through the fill-up opening (Pos. C) if

necessary. The pump is operative.

8. Start-Up

Never let the pump run dry for a long time of period, as

it will destroy the pump (danger of overheating).

The unit must be protected against moisture, frost or

heat. If there is a risk of frost, the pump has to be emptied

completely. Store it in a dry place.

8.1 Domestic booster unit

Connect the Domestic booster unit to the mains power

supply.

The pump of the Domestic booster unit switches on auto-

matically at start-up to build up the pre-adjusted max. sys-

tem pressure. When this pressure is reached, the pump

switches off. The pressure-switch at the Domestic booster

unit makes sure that the unit is working fully automatically. It

switches the pump on, if the system pressure reaches a

pre-adjusted minimum because of water withdrawal (open-

ing the tap). Once the withdrawal is finished and the max.

system pressure is reached again, the pump turns off. If the

pump operates, water must be raised by open tap. If the

pump operates against a closed tap longer than 5 minutes,

the pump will be damaged by overheating. To applicate the

pump at another location please make sure that no air

penetrates in the suction pipe. If air penetrates into the pipe

please repeat the steps described under 7.1 before starting

the pump.

Homa HWE 71 [11/20] Electrical connection

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