Check Of Direction Of Rotation; Installation; Submerged Base Stand Installation; Submerged Installation With Auto-Coupling - Homa MX 34 Serie Originalbetriebsanleitung

This sensor-alarm monitors a leakage affecting the stator
room of the electric motor, which may result in a motor
shortcut.
Therefore the motor control panel should automatically
switch off the motor, when this alarm appears.

6.4. Check of Direction of Rotation

3 Ph-pumps must be checked for correct direction of rota-
tion before start-up. On original HOMA control boxes a con-
trol-light is illuminated, if the direction of rotation is not cor-
rect.
With smaller pumps the direction of rotation may be
checked by watching the start-jek. Put the pump vertical on
the ground and lift one edge. Start the motor. Viewed from
above, the unit must jerk anti-clockwise as the correct di-
rection of rotation is clockwise. With bigger pumps the
check may also be done by watching the rotation of the im-
peller through the discharge or the suction inlet. With
pumps already installed, the check may be done by com-
paring head (pump pressure) and flow (quantity of water) at
different direction of rotation. The direction that gives
higher head and flow is the correct one.
If the direction of rotation is wrong, interchange two of the
phases of the electric power supply. Using an original
HOMA control box with CEE-plug, this may be done by a
180° turning of the small round pole-socket at the plug-end
with a screwdriver.

7. Installation

Pay attention to the maximum depth of immersion (see
pump label).
If the pump is installed in a sump, the sump opening
must be covered with a tread-safe cover after installation.
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 pump or like that).

7.1. Submerged Base Stand Installation

A separate ring base stand, which is available as an ac-
cessory must be fixed at the bottom of the pump.
Fix a 90° elbow to the pump discharge. The pump may be
installed with a flexible discharge hose or a rigid pipe, non-
return valve and isolating valve. If a flexible hose is used,
make sure that it does not buckle.
Fix a chain to the pump handle and lower the pump into the
liquid. If the pump is installed on muddy ground,
support it on bricks to prevent if from sinking in.

7.2. Submerged Installation with auto-coupling

Permanent installation of the pumps can be done on a sta-
tionary auto-coupling. The following instructions refer
to the use of the original HOMA system.
⇒ Place the auto-coupling base unit on the bottom of the pit.
Use a plumb line to fix the correct position of the guide rail
bracket on the inside of the pit cover. Drill mounting holes
and fasten the guide rail bracket provisionally with 2
screws.
⇒ Put the auto-coupling base unit in the exact position and
fasten with expansion bolts to the pit bottom. If the bottom
is uneven, the base unit must be supported to be in hori-
zontal position.
⇒ Assemble the discharge pipe in accordance with the
generally accepted procedures and without exposing the
pipe to distortion or tension.
⇒ Insert the guide rails in the ring of the auto-coupling base
and adjust the length of the rails by cutting them accu-
rately to the guide rail bracket.
⇒ Unscrew the provisionally fastenend guide rail bracket, fit
it on top of the guide rails and fasten it to the pit cover.
Make sure that the guide rails do not have any axial play,
as this would cause noise during pump operation.
⇒ Clean out debris from the pit before lowering the pump
into operation position.
⇒ Fit the coupling flange at the discharge of the pump.
Make sure that the rubber profile-seal is properly fixed to
the flange and will not fall off when the pump is lowered
into the pit. Slide the guide bar of the coupling flange be-
tween the guide rails and lower the pump into the pit by
means of a chain secured to the pump handle. When the
pump reaches the auto-coupling base unit, it will auto-
matically connect tightly.
⇒ Hang up the end of the chain to a suitable hook at the top
of the pit.
⇒ Adjust the length of the motor cable, so that it is not dam-
aged during the pump operation. Make sure that the
cables are not sharply bent or pinched.

7.3. Dry Installation

For installation of the pump outside the collection sump, a
suction pipe must be connected to the pump inlet.
Only pumps with motor jacket cooling must be used for dry
installation.
The pump may be installed vertical or horizontal.
⇒ Fit the bracket or the basestand to the pump.
⇒ Mark and drill mounting holes in the concrete floor.
⇒ Fasten the pump with expansion bolts.
⇒ Connect the motor cable and the monitoring cable.
⇒ Fit the suction and discharge pipes and isolating valves,
if used, and ensure that the pump is not stressed by the
pipe work.
Vent the cooling jacket (model „U")!

8. Start-Up

Never let the pump run dry for a long time of period, as
it will destroy the pump (danger of overheating).
Wet well installation
Start the pump, when the system has been filled with liquid
and vented. Open the isolating valves. Check the position
of the float switches. If necessary, check the direction of
rotation of the pump, as described under 6.4. Put the
switch on the control box to the required mode of
operation.
Dry well installation
On dry installation, make sure that the liquid level in the
collection sump is above the top of the pump volute. If nec-
essary, check the direction of rotation of the pump, as de-
scribed under 6.4. Put the switch on the control box to the
required mode of operation.
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