Pentair Pool Products Myers MWH50 Series Installation And Service Manual page 12

TO REPLACE CAPACITORS ONLY TO REPLACE CAPACITORS ONLY
TO REPLACE CAPACITORS ONLY
All of the single phase motors are of the permanent split All of the single phase motors are of the permanent split
All of the single phase motors are of the permanent split
capacitor type and have no relays or starting switch. They capacitor type and have no relays or starting switch. They
capacitor type and have no relays or starting switch. They
have only a starting capacitor that is in the circuit for both have only a starting capacitor that is in the circuit for both
have only a starting capacitor that is in the circuit for both
starting and running conditions. starting and running conditions.
starting and running conditions.
(1) Remove oil fill plug near the top of the motor and (1) Remove oil fill plug near the top of the motor and
(1) Remove oil fill plug near the top of the motor and
pour the oil out. pour the oil out.
pour the oil out.
(2) Loosen the pug nuts around the cords until they are (2) Loosen the pug nuts around the cords until they are
(2) Loosen the pug nuts around the cords until they are
loose enough to push the cords down inside of the loose enough to push the cords down inside of the
loose enough to push the cords down inside of the
motor housing. motor housing.
motor housing.
(3) Remove the four bolts from the motor housing and (3) Remove the four bolts from the motor housing and
(3) Remove the four bolts from the motor housing and
bump the housing with a plastic hammer to loosen. bump the housing with a plastic hammer to loosen.
bump the housing with a plastic hammer to loosen.
Lay the pump on its side. Lay the pump on its side.
Lay the pump on its side.
(4) Remove the housing carefully to be sure that enough (4) Remove the housing carefully to be sure that enough
(4) Remove the housing carefully to be sure that enough
cord is pushed into the housing to create no tension cord is pushed into the housing to create no tension
cord is pushed into the housing to create no tension
on the cords. on the cords.
on the cords.
(5) Slide motor housing up far enough to expose the (5) Slide motor housing up far enough to expose the
(5) Slide motor housing up far enough to expose the
capacitor and to be able to lay the housing down. capacitor and to be able to lay the housing down.
capacitor and to be able to lay the housing down.
(6) Disconnect wiring from capacitor and loosen capaci- (6) Disconnect wiring from capacitor and loosen
(6) Disconnect wiring from capacitor and loosen capaci-
tor clamp and slide out capacitor. Replace with new capacitor clamp and slide out capacitor. Replace
tor clamp and slide out capacitor. Replace with new
capacitor, tighten and re-connect. Wiring diagram is with new capacitor, tighten and re-connect. Wiring
capacitor, tighten and re-connect. Wiring diagram is
given in these instructions. diagram is given in these instructions.
given in these instructions.
(7) Check all wiring connectors to be sure they are secure. (7) Check all wiring connectors to be sure they are secure.
(7) Check all wiring connectors to be sure they are secure.
(8) Be sure tetraseal gasket is in place. (8) Be sure tetraseal gasket is in place.
(8) Be sure tetraseal gasket is in place.
(9) Slide motor housing back onto pump while pulling (9) Slide motor housing back onto pump while pulling
(9) Slide motor housing back onto pump while pulling
the cords out slowly. Assemble the motor housing the cords out slowly. Assemble the motor housing
the cords out slowly. Assemble the motor housing
with the four bolts. with the four bolts.
with the four bolts.
(10) Re-assemble cord nuts. Be sure washers are seated (10) Re-assemble cord nuts. Be sure washers are seated
(10) Re-assemble cord nuts. Be sure washers are seated
and cords are pulled up to stop against the washers. and cords are pulled up to stop against the washers.
and cords are pulled up to stop against the washers.
Tighten nuts securely. Tighten nuts securely. Tighten nuts securely.
(11) Put pump upright and refill motor with Myers (11) Put pump upright and refill motor with Myers
(11) Put pump upright and refill motor with Myers
submersible motor oil. DO NOT OVER FILL WITH submersible motor oil. DO NOT OVER FILL WITH
submersible motor oil. DO NOT OVER FILL WITH
OIL. With pump upright fill oil to bottom of oil fill OIL. With pump upright fill oil to bottom of oil fill
OIL. With pump upright fill oil to bottom of oil fill
tapping. Replace oil fill plug. tapping. Replace oil fill plug. tapping. Replace oil fill plug.
(12) Be sure pump turns freely before connecting to power. (12) Be sure pump turns freely before connecting to power. (12) Be sure pump turns freely before connecting to power.
Turn pump on side and turn impeller, using screwdriver Turn pump on side and turn impeller, using screwdriver
Turn pump on side and turn impeller, using screwdriver
in slotted shaft. Plug pump into receptacle to test in slotted shaft. Plug pump into receptacle to test
in slotted shaft. Plug pump into receptacle to test
operation. Pump must run quiet and free of vibration. operation. Pump must run quiet and free of vibration. operation. Pump must run quiet and free of vibration.
TO REPLACE POWER CORD AND/OR TO REPLACE POWER CORD AND/OR
TO REPLACE POWER CORD AND/OR
SEAL LEAK DETECTOR CORD SEAL LEAK DETECTOR CORD
SEAL LEAK DETECTOR CORD
(1) Remove motor housing as described above. Discon- (1) Remove motor housing as described above. (1) Remove motor housing as described above. Discon-
nect the push-together terminals and remove the Disconnect the push-together terminals and remove
nect the push-together terminals and remove the
ground screw from the power cord if being replaced. the ground screw from the power cord if being replaced. ground screw from the power cord if being replaced.
(2) Completely unscrew cord bushing to be replaced (2) Completely unscrew cord bushing to be replaced (2) Completely unscrew cord bushing to be replaced
23833A278 23833A278
23833A278
and remove cord assembly from housing. Be sure and remove cord assembly from housing. Be sure
and remove cord assembly from housing. Be sure
remaining terminals are secure on the wires. remaining terminals are secure on the wires.
remaining terminals are secure on the wires.
(3) Replace with proper cord with fittings. Push cord (3) Replace with proper cord with fittings. Push cord
(3) Replace with proper cord with fittings. Push cord
into the motor housing far enough to make proper into the motor housing far enough to make proper
into the motor housing far enough to make proper
connections. Reconnect ground wire if replacing connections. Re-connect ground wire if replacing
connections. Re-connect ground wire if replacing
power cord and securely connect the wires correctly. power cord and securely connect the wires correctly.
power cord and securely connect the wires correctly.
See wiring diagram in these instructions. See wiring diagram in these instructions.
See wiring diagram in these instructions.
(4) Assemble cords and motor housing as described in (4) Assemble cords and motor housing as described in
(4) Assemble cords and motor housing as described in
"Capacitor Replacement". Fill with oil as noted and be "Capacitor Replacement". Fill with oil as noted and be
"Capacitor Replacement". Fill with oil as noted and be
sure pump turns freely before connecting to power. sure pump turns freely before connecting to power.
sure pump turns freely before connecting to power.
TO REPLACE MOTOR STATOR AND SHELL TO REPLACE MOTOR STATOR AND SHELL
TO REPLACE MOTOR STATOR AND SHELL
(1) Remove motor housing as described above. (1) Remove motor housing as described above.
(1) Remove motor housing as described above.
(2) Disconnect all leads from power and seal leak cords (2) Disconnect all leads from power and seal leak cords
(2) Disconnect all leads from power and seal leak cords
and ground wire and set pump upright. and ground wire and set pump upright.
and ground wire and set pump upright.
(3) Loosen the four long screw holding the motor and (3) Loosen the four long screw holding the motor and
(3) Loosen the four long screw holding the motor and
remove slowly. If unit has seal leak probes be sure remove slowly. If unit has seal leak probes, be sure
remove slowly. If unit has seal leak probes be sure
to feed the wires through the slots as the motor is to feed the wires through the slots as the motor is
to feed the wires through the slots as the motor is
being removed. being removed.
being removed.
(4) Either remove previous capacitor and clamp from (4) Either remove previous capacitor and clamp from
(4) Either remove previous capacitor and clamp from
old motor and assemble onto new stator and shell old motor and assemble onto new stator and shell
old motor and assemble onto new stator and shell
or replace with a new capacitor and assemble the or replace with a new capacitor and assemble the
or replace with a new capacitor and assemble the
two capacitor leads per wiring diagram. two capacitor leads per wiring diagram.
two capacitor leads per wiring diagram.
(5) Position bearing spring washer on top of upper ball (5) Position bearing spring washer on top of upper ball
(5) Position bearing spring washer on top of upper ball
bearing. (Fig. 1 -3 HP as shown in Figure 1). bearing. (Fig. 1 -3 HP as shown in Figure 1).
bearing. (Fig. 1 -3 HP as shown in Figure 1).
(6) Tighten terminal screws of seal leak probes and feed (6) Tighten terminal screws of seal leak probes and feed
(6) Tighten terminal screws of seal leak probes and feed
wires through the motor slots. wires through the motor slots.
wires through the motor slots.
(7) Position the "stator with shell" into place and line up (7) Position the "stator with shell" into place and line up
(7) Position the "stator with shell" into place and line up
screws with the bosses and tighten the (4) long screws with the bosses and tighten the (4) long
screws with the bosses and tighten the (4) long
screws. Extend probe wires out through the slots. screws. Extend probe wires out through the slots.
screws. Extend probe wires out through the slots.
Lay unit down in line with motor housing. Lay unit down in line with motor housing.
Lay unit down in line with motor housing.
(8) Be sure pump turns freely with screwdriver in (8) Be sure pump turns freely with screwdriver in
(8) Be sure pump turns freely with screwdriver in
impeller end of shaft. impeller end of shaft.
impeller end of shaft.
(9) Re-connect all terminals securely per wiring diagram. (9) Reconnect all terminals securely per wiring diagram.
(9) Re-connect all terminals securely per wiring diagram.
(10) Be sure tetraseal gasket is in place. (10) Be sure tetraseal gasket is in place.
(10) Be sure tetraseal gasket is in place.
(11) Reassemble motor housing and fill with oil as noted (11) Reassemble motor housing and fill with oil as noted
(11) Reassemble motor housing and fill with oil as noted
above in capacitor replacement. above in capacitor replacement.
above in capacitor replacement.
NOTE: On three phase motors always check unit for NOTE: On three phase motors always check unit for
NOTE: On three phase motors always check unit for
proper rotation. With pump on its side apply power by proper rotation. With pump on its side apply power by proper rotation. With pump on its side apply power by
turning on, then off, quickly. Impeller must turn counter- turning on, then off, quickly. Impeller must turn counter- turning on, then off, quickly. Impeller must turn counter-
clockwise when looking into the impeller inlet. It not, clockwise when looking into the impeller inlet. If not, clockwise when looking into the impeller inlet. It not,
interchange any two leads in the control box. interchange any two leads in the control box. interchange any two leads in the control box.
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