Commissioning; Mechanical Seal; Maintenance - Wilo -IL series Einbau- Und Betriebsanleitung

ENGLISH
Starting arrangement
DOL-Starting
Y-V-Starting
– Comply with respective installation and operating instructions when wiring to automatic pump control
gear

6 Commissioning

– Pump body, suction and inlet piping must be fil-
led and properly vented.
The pump must not run dry. Dry-
ATTENTION!
running will damage the mechani-
cal seal!
– In order to avoid noise and damage due to cavi-
tation a minimum inlet pressure must be ensured
at the pump suction port. This minimum inlet
pressure depends on the operating conditions
and the duty point of the pump and must be ac-
cordingly calculated. Significant criteria for cal-
culating the minimum required inlet pressure are
the NPSH-level of the pump at its operating po-
int and the vapour pressure of the liquid.
– Vent pumps by unscrewing its air vent plugs (Fig.
5, 6, 7, pos. 1.31).
Depending on the fluid temperature and
the system pressure, if the vent screw is
completely loosened hot liquid or gas
can escape or even shoot out at higth
pressure. Beware of sclading!
– Check the direction of rotation by briefly swit-
ching on the pump and make sure that rotation
coresponds with the arrow on the motor. If ne-
cessary, correct as follows:
– DOL-Starting: Change any 2 phase wires at
the motor terminals (e.g. L1 and L2).
– Y-V-Starting: At the motor terminals change
winding start and end terminal connections
respectively of 2 windings (e.g. V1 with V2 and
W1 with W2).

7 Maintenance

Before starting service or repair work
switch off the plant and secure against
unauthorized switching.
16
Motor power rating
P2 ≤ 3 kW
Mains power
3 ~ 230 V
V-connections (4a)
Remove terminal
bridges (4c)
3 ~ 400 V
Y-connections (4b)
Not possible
In the event of high temperatures and
high system pressure, the pumps
should be allowed to cool down.
Beware of sclading!
7.1

Mechanical seal

The mechanical seal does not require any special
maintenance. Slight may occur during the running-
in period. Visual leakage checks are however re-
quired from time to time. Distinctly visible leakage
will require an exchange of the seal. WILO offers a
repair set containing all parts required for an ex-
change.
Exchange of the mechanical seal (Fig. 5, 6, 7):
– Switch off power supply and secure against un-
authorized switching.
– Close isolating valves at both pump ports.
– Lower the pressure of the pump by opening the
air vent plugs (pos. 1.31).
In the event of hot liquids. Beware of
sclading!
– Disconnect wires from motor terminals if cable
length is too short for dismantling the motor.
– Remove protection cap (pos. 1.32.) of the coup-
ling.
– Unlock partly coupling screws of the coupling-
unit (pos. 1.5).
– Unscrew the motor fixing-screws (pos. 5) at mo-
torflange and lift the motor off pumphousing by
means of suitable lifting gear. The adapter-ring
for BL-pumps is hereby loosened (Fig. 7, pos. 8).
– Unscrew the lanternen fixing-screws (pos. 4), di-
sassemble the lantern-unit with coupling,
pumpshaft, mechanical seal and impeller from
the pump housing.
– Unscrew the impeller fixing-nut (pos. 1.11) toget-
her with the plain washer (pos. 1.12) and pull off
the impeller (pos. 1.13) from the pumpshaft.
Motor power rating
P2 ≥ 4 kW
Mains power
3 ~ 400 V
V-connections (4a)
Remove terminal
bridges (4c)