Wilo MVI 15, Инструкция по установке и эксплуатации

Страница: 18 / 22

18
CAUTION! Possible damage of the pump!
Incorrect rotation will cause poor pump
performance and cause possible pump damage.
8.1.2 Air evacuation process – Pump in suction lift
- Close the isolation valve on the discharge side
(component 9 in
Fig. 7i-page 11-Suction lift
installation
).
- Open the isolation valve on the suction
side(component 5 in
Fig. 7i-page 11-Suction lift
installation ).
- Remove the priming plug (component 4 in Fig.
7i -page 11-Suction lift installation ).
- Fill the pump and the suction pipe with water.
- Make sure that there is no air in the pump
and in the suction pipe: refill until the complete
removal of air is achieved.
-
Close the filling plug (component 4 in Fig. 7i
-page 11-Suction lift installation )
- Start the pump and check if the direction of
rotation is correct.
- Immediately open the isolation valve
(component 9 in
Fig. 7i-page 11-Suction lift
installation ) on the discharge side a little, to
assure the proper prime. Once assured, open the
valve entirely.
CAUTION! Possible damage of the pump!
Incorrect rotation will cause poor pump
performance and cause possible pump damage.
WARNING! Risk of burning!
When the pumped liquid is hot and the pressure
high, the stream escaping at the air bleed screw
may cause burns or other injuries.
8.2 Starting up
CAUTION! Possible damage of the pump!
The pump must not operate at zero flow (closed
discharge valve).
To prevent overheating of the internal pump
components, the pump should not be used at
flows below the minimum flow rate.
The curve in Fig. 8a-page 13-Minimum Flow
shows the minimum flow rate as a percentage
of the nominal flow rate in relation to the liquid
temperature.
WARNING! Risk of injury!
When the pump runs, coupling guards must be in
place, tightened with all appropriate screws.
WARNING! Noise!
Noise emitted by pumps could be very high;
hearing protection must be used in case of
extended operation in close proximity to the
pump.
WARNING!
Installation must be designed in order that no one
is injured in case of fluid leakage.
8.3 Minimum Inlet Pressure - NPSH
To avoid cavitation, make sure that there is a
minimum pressure on the suction side of the
pump.Refer to the pump’s NPSHR curve.
WARNING! Risk of scalding!
Pressurized water can easily turn into steam
when venting, creating a condition where
scalding may occur.
9. Maintenance
All servicing should be performed by an
authorized service representative!
WARNING! Electrical shock hazard!
Dangers caused by electrical energy must be
excluded.
All electrical work must be performed after the
electrical supply has been locked out and secured
against unauthorized switching.
WARNING! Risk of scalding!
At high water temperatures and system pressure
close isolating valves before and after the pump.
First, allow pump to cool down.
General Notes:
- The pump does not have a recommended
maintenance schedule.
- The seals are wear parts easily replaced by
cartridge seal kits.
- Always keep the pump perfectly clean.
- Repairs to the electric motors are to be handled
only by Authorized agents.
- If you order a complete pump with motor,
please refer to the motor manual for additional
information.
9.1 Service of Mechanical Seal Instructions
Step 1: Remove the screws holding the
coupling guards and remove the guards.
Step 2:
Unscrew the allen screws out of the
couplings and remove the coupling halves.
Step 3:
Unscrew the four screws holding the
seal carrier and remove the carrier.
Step 4:
Losen the allen screws holding the seal
about one-half turn. Do not remove the screws.
Step 5:
Lift the seal straight up and off the
pump shaft. The cartridge seal will come off as
an assembly.
Step 6:
Service or replace mechanical seal.
Step 7:
Lubricate the shaft seals and O-rings.
Install the seal on the pump shaft making sure
that it seats on the pump head.
Step 8:
Slide the seal carrier down the shaft
until it seats solidly on the shaft seal flange.
Grease the threads on the socket head bolts
and cross tighten them to 46 ft-lbs. torque.
Scot Pump 02/2022