The complete operator’s manual and product technical information are
available on the www.zenit.com website
Before installing and using the pump, read the instructions given below carefully.
Check that the box and its contents are in perfect condition and stop the in-
stallation in the event that any defects or anomalies are found, then inform the
supplier.
1. CONDITIONS OF USE
The DRBlue and APBlue models are designed for the evacuation of clear water
or dirty water containing small solid bodies.
In the DRBlue versions the intake strainer can be removed by skilled technical
staff to enable fluid intake from up to the last few millimetres from the bottom.
The motor can be allowed to run uncovered very briefly.
The DGBlue model guarantees a clear passage for solids of up to 50 mm and is
suitable for the treatment of dirty water.
The GRBlue model can be used for sewage containing fibres which can be
shredded using an intake shredding system.
WARNING Pollution of the liquid could occur due to leakage of lubricants.
2. INSTALLATION
The pump must operate completely submerged in the liquid to ensure that the
motor is cooled sufficiently (Fig.1 page 27).
If the pump is installed inside a shaft, this must be large enough to allow the float-
ing switch, if installed, to move freely. The manufacturer recommends the use of
shafts which are no smaller than 500mm x 500mm x 500mm.
WARNING Check that the submersible pump has been primed. In some cases,
an air bubble may form in the upper part of the pump body, which prevents liquid
pumping.
WARNING Before installing and/or starting a DRBlue 40/50 or DGBlue 40/50
pump after a long period out of use, check that the shaft turns freely by procee-
ding as follows (Fig. 2 page 27):
1. take the precautions detailed in the “Safety warnings” manual;
2. turn the pump upside down;
3. (for DRBlue only) insert a Torx screwdriver in the hole in the centre of the
intake strainer;
4. engage the Torx screwdriver with the impeller fixing screw;
5. turn the screwdriver clockwise and anti-clockwise 3-4 times to ensure that the
impeller rotates freely.
2.1 Mobile post (Fig. 3 page 27): using a hose union, connect the delivery pipe
to a hose with an internal reinforcement coil and a diameter which is the same
size as or larger than the electric pump outlet.
2.2 Fixed post (Fig. 4 page 27): connect the electric pump to a metal piping,
fitting a non-return valve and an interception gate valve on the said metal piping.
This ensures the pump stability is guaranteed by the piping.
The pump can also be connected to polyethylene piping, using the relative union.
Secure the hose to the union by means of a metal band clamp.
2.3 With the joining foot (Fig. 5 page 27): Fix the joining foot to the bottom of
the tank first, using expansion plugs. Install the delivery pipe with the relative
non-return valve and gate valve.
Engage two guidepipes on the joining foot, fixing them in the upper part using the
spacer bracket provided by Zenit with the joining foot.
This way, the pump can be lowered supported with a chain or cable hooked
around the handle and, thanks to the two guide pipes it will fit perfectly in place
on the foot.
3. FLOATING SWITCH
The electric pump can be supplied with a floating switch and its functioning is
completely automatic (Fig. 6 page 27).
The floating switch has an adjustable stroke to allow regulation of the on and
off levels.
Make sure that there is nothing around that could obstruct the movement.
It is important that the cables do not get in each other’s way, twisted up or stuck
in any jutting parts or grips inside the tank (Fig. 7 page 27).
If the pump does not have a start/stop floating switch, one or more start/stop
floating switches should be installed inside the tank to control starting and stop-
ping and for any alarms.
In the event of strong turbulence, floating switches should be installed on a rigid
rod mounted inside the tank
Make sure that the minimum level does not fall below the pump’s upper shield
(Fig. 8 page 27).
4. ELECTRICAL CONNECTIONS (Figs. 9-10 page 28)
• All operations connected to the mains must be performed by qualified person-
nel, in compliance with the local regulations.
• The electrical connection of the models without plug must be performed by
connecting first the yellow-green to the ground, then the other wires.
• To ensure safety the pump is to be supplied through a residual current device
(RCD) having a rated residual operating current not exceeding 30 mA.
• Appliances without plug are intended to be permanently connected to fixed
wiring; a switch that ensure the all-pole disconnection incorporated in the fixed
wiring is to be provided. The switch shall be directly connected to the supply
terminals and shall have a contact separation in all poles, providing full di-
sconnection under overvoltage category III (4000V).
• The pump motor must be protected from overload by installing in the main
control circuit or power line of pump an overload protection (motor protection
breaker). The protection must be adequately dimensioned according to the
rated pump data.
• The starting current in direct-on-line start can be up to six times higher than
the rated current.
WARNING The pump may be fitted with automatically-resetting thermal protec-
tion which prevents damage in the event of overheating.
Once the pump has cooled own, it restarts automatically.
Before installation, ensure that:
• the power supply line is connected to ground and complies with the relevant
legal requirements;
•the power supply cable and the float switch cable (if installed) are not dama-
ged.
5. CHECKING THE IMPELLER ROTATION DIRECTION
(three-phase models only)
Before making the three-phase electrical connection, make sure the rotation di-
rection is correct.
To check the rotation direction, proceed as follows:
1. take the precautions detailed in the “Safety warnings” manual;
2. Lay the pump horizontal on one side and leave it free
3. Temporarily connect the yellow-green wire to ground and then connect the
power supply wires to the contactor;
4. Make sure there are no people or objects within a radius of at least 1 metre
of the pump;
5. Turn on the start switch for a few moments;
6. Watch the impeller as it stops through the intake port and check that it turns
anticlockwise.
If the pump is rotating in the wrong direction, invert two of the power supply wires
in the contactor and try again.
Once the correct rotation direction has been obtained, MARK the power supply
wire connection positions, REMOVE the temporary electrical connections and
install the pump in the planned position.
6. WARRANTY
Zenit undertakes to repair or replace the product if failures are due to design,
manufacturing and assembly defects and are reported to Zenit during the war-
ranty period.
The warranty does not cover failures due to:
• normal wear and tear;
• improper handling, installation and use;
• use with incorrectly connected control systems;
• work done by unskilled staff;
• use of non-genuine spare parts.
WARNING Any modifications made to the product without the manufacturer’s
authorisation may cause hazards and lead to a deterioration in performance and
loss of warranty cover.
