Introduction; Identification; Nameplate - Grundfos LCD 109 Handbuch

4. Introduction

The level converter is meant to replace the current
pressure switch units of the LC 109 and LCD 109
controllers as these units are obsolete.
Old pressure switch unit
Fig. 2
The level converter is equipped with a piezoresistive
sensor known from the Grundfos LC 220 and LC 221
controllers. The piezoresistive pressure sensor
placed in the level converter is connected via a hose
to a pressure tube in the tank. The hose is connected
to the level converter using a bulkhead fitting.
The hose is connected to the pressure tube head at
the tank.
Pressure tube, pressure tube head and
Fig. 3
hose
The rising liquid level compresses the air inside the
pressure tube and hose, and the piezoresistive
sensor converts the air pressure into an analogue
signal.
The level converter uses the analogue signal to start
and stop the pump and to indicate high water-level
alarm.
The new level converter simulates the four switches
of the old pressure switch unit.
The table below shows the switching points of the
different Multilift units corresponding to the liquid
levels.
Simulated
Signal
switch
S4 on Alarm
S3 on Start pump 2-250
S2 on Start 250
S1 on Start 180
S1 off Stop

5. Identification

5.1 Nameplate

Type LEVEL CONVERTER MULTILIFT
Only for: LC(D)109
98444600 V01
Prod. No.
1x 220-240V~ 50/60Hz
U
N
0,4kg
G T .: 0 to 40°C
Amb
Made in Germany
Nameplate
Fig. 4
MSS, M, MD
Switching point
measured from
floor [mm]
310
280
240
160
124
1327
P.c.
8888
Serial No.
DK-8850 Bjerringbro, Denmark
5