Maintenance - Pentair MYERS MWH50 Série Manuel D'installation Et D'utilisation

MAINTENANCE

BEFORE DISMANTLING PUMP FOR REPLACEMENT OF PARTS
Clean pump thoroughly. Knock off all scale and deposits. Use
sandblast if possible. Submerge complete unit in dilute bleach
solution for one hour before disassembly.
TO REPLACE CAPACITORS ONLY
All of the single phase motors are of the permanent split
capacitor type and have no relays or starting switch. They have
only a starting capacitor that is in the circuit for both starting
and running conditions.
1. Remove oil fill plug near the top of the motor and pour the oil
out.
2. Loosen the pug nuts around the cords until they are loose
enough to push the cords down inside of the motor housing.
3. Remove the four bolts from the motor housing and bump the
housing with a plastic hammer to loosen. Lay the pump on
its side.
4. Remove the housing carefully to be sure that enough cord is
pushed into the housing to create no tension on the cords.
5. Slide motor housing up far enough to expose the capacitor
and to be able to lay the housing down.
6. Disconnect wiring from capacitor and loosen capacitor
clamp and slide out capacitor. Replace with new capacitor,
tighten and re-connect. Wiring diagram is given in these
instructions.
7. Check all wiring connectors to be sure they are secure.
8. Be sure tetraseal gasket is in place.
9. Slide motor housing back onto pump while pulling the cords
out slowly. Assemble the motor housing with the four bolts.
10. Re-assemble cord nuts. Be sure washers are seated and
cords are pulled up to stop against the washers. Tighten
nuts securely.
11. Put pump upright and refill motor with refined paraffinic
transformer oil, ¹Shellflex™ 2210 or equivalent. DO NOT
OVER FILL WITH OIL. With pump upright fill oil to bottom of
oil fill tapping. Replace oil fill plug
¹ Shell Oil Company, Texas
12. Be sure pump turns freely before connecting to power. Turn
pump on side and turn impeller, using screwdriver in slotted
shaft. Plug pump into receptacle to test operation. Pump
must run quiet and free of vibration.
TO REPLACE POWER CORD AND/OR SEAL LEAK
DETECTOR CORD
Remove motor housing as described above. Disconnect the
push-together terminals and remove the ground screw from the
23822A278 (02-13-20)
power cord if being replaced.
Completely unscrew cord bushing to be replaced and remove
cord assembly from housing. Be sure remaining terminals are
secure on the wires.
Replace with proper cord with fittings. Push cord into the motor
housing far enough to make proper connections. Reconnect
ground wire if replacing power cord and securely connect the
wires correctly. See wiring diagram in these instructions.
Assemble cords and motor housing as described in Capacitor
Replacement. Fill with oil as noted and be sure pump turns
freely before connecting to power.
T O REPLACE MOTOR STATOR AND SHELL
1. Remove motor housing as described above.
2. Disconnect all leads from power and seal leak cords and
ground wire and set pump upright.
3. Loosen the four long screw holding the motor and remove
slowly. If unit has seal leak probes, be sure to feed the wires
through the slots as the motor is being removed.
4. Either remove previous capacitor and clamp from old motor
and assemble onto new stator and shell or replace with a
new capacitor and assemble the two capacitor leads per
wiring diagram.
5. Position bearing spring washer on top of upper ball bearing.
6. Tighten terminal screws of seal leak probes and feed wires
through the motor slots.
7. Position the "stator with shell" into place and line up screws
with the bosses and tighten the (4) long screws. Extend
probe wires out through the slots. Lay unit down in line with
motor housing.
8. Be sure pump turns freely with screwdriver in impeller end
of shaft.
9. Reconnect all terminals securely per wiring diagram.
10. Be sure tetraseal gasket is in place.
11. Reassemble motor housing and fill with oil as noted above in
capacitor replacement.
NOTICE On three phase motors always check unit for proper
rotation. With pump on its side apply power by turning on, then
off, quickly. Impeller must turn counter-clockwise when looking
into the impeller inlet. If not, interchange any two leads in the
control box.
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