Lowara LER 200-200 UNL 556 [9/19] Model ler lers lez
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Lowara LER 200-200 UNL 556 [9/19] Model ler lers lez

Lowara LRZ 65-250 U 1502 [9/19] Model ler lers lez
Installation, Operation and Maintenance Instruction
Model LER, LERS, LEZ
LER 100-english page 6
Revision 01
Article No 771073302
Issue 01/2010
U1 carbon / silicon carbide / EPDM
(BQ1EGG)
Exception: ∅65- and ∅75mm seal carbon /
ceramics / EPDM
U2 carbon / silicon carbide / viton (BQ1VGG)
U3 silicon carbide / silicon carbide / viton
(Q1Q1VGG)
Position (4) - Impeller material
N = Cast iron (0.6020)
L = Ductile iron (0.7040) - only for pump size
DN 300
Position (5) - Pump casing material
N = Cast iron (0.6020)
L = Ductile iron (0.7040)
Other materials are not available
Position (6) - Motor power (in 1/10 kW)
Position (7) - Number of motor contacts -
2 pole = 2900 rpm, 4 pole = 1450 rpm,
6 pole = 950 rpm
3.3 Shaft Sealing
3.3.1 Structure of the mechanical seal
This shaft seal is a single mech. seal with installation
dimensions according to EN 12756 (DIN 24960) form
"U". No additional flushing of the seal chamber is
necessary. The seal casing where the mechanical
seal is located must always be filled with liquid.
For a description of materials and operational ranges
of the mech. seals supplied, please refer to the data
sheet in the Operation Instructions and order
confirmation.
For the internal structure of the mechanical seal see
the following sectional drawings.
3.3.2 General information
The reuse of mech. seals that have already
been used for a longer time can lead to leaking
at the seal faces after reinstallation. Ther
efore
the replacement of the mech. seal with a new
one is recommended. The removed mechanical
seal can be reconditioned by the manufacturer
and serve as a replacement mech. seal.
3.3.3 Information for the mounting
Pay attention to the utmost cleanness
!
Especially the seal faces must be clean, dry and
undamaged. Don’t apply lubrication on the seal
faces of the mech. seal.
If a lubricant is provided with the replacement
mech. seal, you should use this.
Use mineral grease or oil only if you are
compl
etely sure that the elastomers of the
mech. seal are oil resistant. Use no silicone.
Use only lubricants with which you are certain
that no dangerous reaction can occur between
the lubricant and the pumped medium.
Have all required parts prepared s
o that
assembly can be completed quickly. The
lubricants are only effective for a short time.
After that, the axial mobility and thus
automatic adjustment of the elastomers are lost.
Never push elastomers over sharp edges. If
necessary, use mounting devices.
During installation, push the mech. seals with a
bellows in such a way that the bellows is
compressed and not stretched (danger of
tearing apart!).
3.4 Bearing
The shaft is guided by the ball bearings of the motor.
The bearings are grease lubricated for life and,
therefore maintenance-free.
3.5 Approximate Value for Sound
Pressure Level
Pump
Sound pressure level L
pA
in
dB(A)
2900
rpm
1450
rpm
950
rpm
100-125 4 kW 65
100-125 5,5 kW 74
100-160 7,5 kW 74
125-160 30 kW 78
125-200 30 kW 78
125-200 37 kW 80
150-200 30 kW 78
150-200 37 kW 80
150-200 45 kW 80
150-250 55 kW 82
200-200 11 kW 68
200-250 15 kW 69
200-250 18,5 kW 70
200-250 22 kW 71
200-270 30 kW 72
200-315 37 kW 72
250-315 37 kW 74
250-315 45 kW 78
250-315 55 kW 82
250-350 75 kW 82
250-400 90 kW 82
300-350 110 kW 83
300-400 110 kW 83
300-450 132 kW 83
300-480 160 kW 84
200-200 5,5 kW 64
200-250 5,5 kW 64
200-270 7,5 kW 68
200-315 11 kW 68
250-315 11 kW 65
250-315 15 kW 66
250-350 18,5 kW 68
250-350 22 kW 68
250-400 30 kW 68
The specified values fort he sound pressure level L
pA
are valid for pump and motor.
Sound pressure level L
pA
measured in 1 m distance
from pump surface acc. to DIN 45635, part 1 and 24.
Room and foundation influences are not considered.
The tolerance for these values is ±3 dB(A).
Addition with 60 Hz-operation:
Pump alone: −
Pump with motor: +4 dB(A)

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