Grundfos LC 221, Installation And Operating Instructions Manual

Page: 22 / 796

English (GB)
22
7.3.2 Inlet pipe connections, Multilift MLD
1. Check the scope of delivery.
For scope of delivery, see section 2. Scope of delivery .
2. Prepare the
∅
150 inlet.
Use a cup drill
∅
150 to drill out the hole along the recessed
line. See fig. 21 . The tank minimum inlet level for MLD is
approximately 560 mm. See fig. 23 .
3. Prepare the additional
∅
50 inlet.
Cut along the stepped line of the
∅
50 inlet port on top of the
tank.
Fig. 23 Minimum inlet level for MLD
7.3.3 Further connections for Multilift MD and MLD
1. Connect the discharge pipe.
Install an isolating valve between the non-return valve and the
supplied flexible connection hose, DN 100 (internal diameter
110 mm). A flexible connection can be ensured if a distance of
approx. 3 cm is left between the pipe ends of the connection
piece and the discharge pipes.
Fig. 24 Isolating valve on top of non-return valve
2. Connect the venting pipe.
The DN 70 venting port on top of the tank is open.
Connect the venting pipe to the venting port via a flexible
connection piece. The venting pipe must be led out above the
roof into the open air in accordance with local regulations.
Check the use of venting valves (accessory) according to
local regulations if venting above the roof is impossible.
A flexible connection can be ensured if a distance of
approx. 3 cm is left between the venting pipe end and the
venting port.
3. Connect the diaphragm pump (optional).
Fit the diaphragm pump on the discharge side. To facilitate
servicing of the diaphragm pump, we recommend fitting a
1 1/2" isolating valve to the tank port.
4. Fix the tank to the floor.
Fig. 25 Fixing point for fixation of tank to the floor
8. Installation of LC 221 controller
The installation must be carried out by authorised personnel in
accordance with local regulations.
8.1 Location
LC 221 can be installed at ambient temperatures ranging from
0 °C to +40 °C.
Enclosure class: IP56.
Install the controller as close as possible to the lifting station.
When installed outdoors, LC 221 must be placed in a protective
shed or enclosure. LC 221 must not be exposed to direct sunlight.
8.2 Mechanical installation
Proceed as follows:
• Mount LC 221 on a plane wall surface.
• Mount LC 221 with the cable entries pointing downwards
(additional cable entries, if required, must be fitted in the
bottom plate of the cabinet).
• Mount LC 221 with four screws through the mounting holes in
the back plate of the cabinet. Drill the mounting holes with a
6 mm drill using the drilling template supplied with the
controller. Fit the screws into the mounting holes and tighten
securely. Fit the plastic caps.
TM
03
36
13
04
06
TM
05
18
66
38
11
T
M
05
03
34
10
11
Warning
Before making any connections in LC 221 or
working on pump, pit, etc., make sure that the
power supply has been switched off and that it
cannot be accidentally switched on.
Warning
Do not install the LC 221 controller in explosion
hazard areas.
Warning
When drilling the holes, take care not to damage
any cables or water and gas pipes. Ensure a safe
installation.
Note
LC 221 can be mounted without removing the
front cover.