Installation; Installation On Auto-Coupling; Free-Standing Installation; Pumps With Control Box - Grundfos APG Serie Montage- Und Betriebsanleitung

6. Installation

The extra nameplate supplied with the pump should
be fixed at the installation site.
Prior to installation, check the oil level in the oil
chamber. See section 9. Maintenance and

6.1 Installation on auto-coupling

See figures 1 and 2, pages
up to and including 3.3 kW and fig. 4, page 161, for
pumps from 4.8 kW up to and including 9.2 kW.
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 the 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 position. Fasten the auto-coupling base
unit with heavy-duty expansion bolts. If the
bottom of the pit is uneven, the auto-coupling
base unit must be supported so that it is level
when fastened.
3. Assemble the discharge line in accordance with
the generally accepted procedures and without
exposing the line to distortion 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.
The guide rails must not have any axial
Caution 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 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. When
the pump reaches the auto-coupling base unit,
the pump will automatically connect tightly.
8. Hang 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.
The end of the cable must not be
Caution submerged, as water may penetrate
through the cable into the motor.
service.
158 and 159, for pumps

6.2 Free-standing installation

See figures 3 and 5, pages
The APG.50.11.3 and APG.50.12.1 pumps have
pump housing and base stand cast in one piece for
free-standing installation.
The larger APG pumps should be provided with a
separate base stand.
For free-standing installation of the pumps, fit a 90 °
elbow on the discharge port. The pump can be
installed with a hose or rigid pipe and valves.
In order to facilitate service of the pump, fit a flexible
union or coupling to the discharge line for easy
separation.
If a hose is used, make sure that the hose does not
buckle, and that the inside diameter of the hose
matches that of the discharge port.
If a rigid pipe is used, the union or coupling, non-
return valve and isolating valve should be fitted in
the sequence mentioned, as seen from the pump
side.
Lower the pump into the liquid.
If the pump is installed in muddy conditions or on
uneven ground, we recommend placing the pump on
bricks.

6.3 Pumps with control box

Pumps with a control box may be supplied with a
level switch with cable. The level switch cable should
be fastened in the retainer on the pump handle.
The level difference between start and stop may be
adjusted by adjusting the free length of cable
between the level switch and the retainer.
Large difference in level: long cable. Small difference
in level: short cable.
160 and 161.
7