Submerged Installation On Auto-Coupling; Free-Standing Submerged Installation; Dry Installation; Level Controllers - Grundfos AP80 Vortex Montage- Und Betriebsanleitung

4.1 Submerged installation on auto-coupling

Pumps for permanent installation can be installed on a stationary
auto-coupling and operated completely or partially submerged in
the pumped liquid.
1. Drill mounting holes for guide rail bracket on the inside of the
pit and fasten the guide rail bracket provisionally with two
screws.
2. Place the auto-coupling base unit on the bottom of the pit. Use
a plumb line to establish the correct positioning. Fasten with
expansion bolts. If the bottom of the pit is uneven, the auto-
coupling base unit must be supported so that it is level when
being fastened.
3. Assemble the discharge line in accordance with the generally
accepted procedures and without exposing the line to distor-
tion or tension.
4. Insert the guide rails in the rings of the auto-coupling base unit
and adjust the length of the rails accurately to the guide rail
bracket.
5. Unscrew the provisionally fastened guide rail bracket, fit it on
top of the guide rails and finally fasten it firmly to the pit wall.
Note: The guide rails must not have any axial play as this would
cause noise during pump operation.
6. Clean out debris from the pit before lowering the pump into the
pit.
7. Fit the auto-coupling half on to the discharge port of the pump.
Then slide the guide bar of this coupling half between the
guide rails and lower the pump into the pit by means of a chain
secured to the eye bolts of the pump. When the pump reaches
the auto-coupling base unit, the pump will automatically con-
nect tightly.
8. Hang up the end of the chain on a suitable hook at the top of
the pit.
9. Adjust the length of the motor cable by coiling it up on a relief
fitting, so the cable is not damaged during operation. Fasten
the relief fitting to a suitable bracket at the top of the pit. Make
sure that the cables are not sharply bent or pinched.
Note: The end of the cable must not be submerged, as water may
penetrate through the cable into the motor.

4.2 Free-standing submerged installation

1. Fit the separate base stand to the pump suction flange.
2. Fit a 90° elbow to the pump discharge port and connect the
discharge pipe/hose.
If a hose is used, make sure that the hose does not buckle and
that the inside diameter matches that of the discharge port.
3. Lower the pump into the liquid. It is recommended to position
the pump on a solid foundation.

4.3 Dry installation

Applies only to pumps of 4.8 kW and up:
In dry installations, the pump is installed outside the pump sump.
The pump motor is enclosed and watertight and will not be dam-
aged if the installation site is flooded with water.
1. Fit the bracket and base stand to the pump.
2. Mark and drill mounting holes in the concrete floor.
3. Fasten the pump with expansion bolts.
4. Check that the pump is vertical/horizontal.
5. Connect the motor cable and the monitoring cable.
In order to facilitate service on the pump, isolating valves should
be fitted on either side of the pump.
6. Fit the suction and discharge pipes and isolating valves, if
used, and ensure that the pump is not stressed by the pipe-
work.

4.4 Level controllers

The AP80 pumps can be supplied with a separate level controller:
Type LC for one-pump installations and type LCD for two-pump
installations.
The LC controller is fitted with two or three level switches. The
third level switch, which is optional, is for high-level alarm.
The LCD controller is fitted with three or four level switches: one
for common stop and two for start of pumps. The fourth level
switch, which is optional, is for high-level alarm.
When installing the level switches, the following points should be
observed:
1. To prevent air intake and vibrations in submerged pumps, the
stop level switch must be fitted in such a way that the pump
is stopped before the liquid level is lowered below the top of
the pump housing.
2. The start level switch should be installed in such a way that
the pump is started at the required level; however, the pump
must always be started before the liquid level reaches the bot-
tom inlet pipe in the pit.
3. The high-level alarm switch, if installed, should always be in-
stalled about 10 cm above the starting level switch; however,
alarm must always be given before the liquid level reaches the
inlet pipe to the pit.

4.5 Temperature sensors

Temperature sensors are built into the stator windings, and a
contact in the sensors will open in case of overtemperature, i.e.
130°C.
Operating conditions:
Voltage Max. current
[VAC]
250
500
Non-explosion-proof pumps have only one set of temperature
sensors.
Explosion-proof pumps have two sets of temperature sensors.
The extra set of sensors will open at a temperature that is approx.
10°C higher than the opening temperature of standard sensors.
The extra set of sensors provides additional protection against
overtemperature in potentially explosive environments.
The temperature are connected to the monitoring cable, see sec-
tion 5. Electrical connection, and must be connected to the safety
circuit of the separate pump controller.

4.6 Moisture sensors

Applies only to pumps of 4.8 kW and up:
Pumps for submerged installation are available with or without
moisture sensors.
Pumps with moisture sensors have one sensor in the oil chamber
and another in the chamber below the top cover.
Pumps for dry installation are always supplied with one mois-
ture sensor only, which is in the oil chamber.
A moisture sensor consists of two probes between which the re-
sistance (conductivity) is measured. In case of moisture ingress,
the resistance will change depending on the amount and conduc-
tivity of the entering liquid.
In order to enable motor cutout in case of a leak, the pump con-
troller must include a tripping unit for each sensor. This unit must
maintain an electrically separated AC 24 voltage across the sen-
sor and should have an adjustable sensitivity of 0 to 100 kΩ.
The sensitivity of the tripping unit should be set to approx. 50 kΩ,
depending on the conductivity of the pumped liquid.
The moisture sensors are connected to the monitoring cable, see
section 5. Electrical connection, and the tripping units of these
sensors must be connected to the safety circuit of the separate
pump controller.
cos ϕ
[A]
2.5 1.0
1.6 0.6
0.75 1.0
0.5 0.6
5