Shaft Seal Replacement; Wiring Diagram - Pentair Pool Products Myers MWH50 Series Installation And Service Manual

SHAFT SEAL REPLACEMENT

SHAFT SEAL REPLACEMENT SHAFT SEAL REPLACEMENT
(1) Remove plugs in motor housing and in seal (1) Remove plugs in motor housing and in seal (1) Remove plugs in motor housing and in seal
housing (for double seal units) and drain oil. housing (for double seal units) and drain oil. housing (for double seal units) and drain oil.
(2) Remove four bolts holding the volute case and bump (2) Remove four bolts holding the volute case and bump (2) Remove four bolts holding the volute case and bump
with a plastic hammer to loosen and remove case. with a plastic hammer to loosen and remove case. with a plastic hammer to loosen and remove case.
(3) Hold impeller and unscrew impeller locking screw. (3) Hold impeller and unscrew impeller locking screw. (3) Hold impeller and unscrew impeller locking screw.
Turn counterclockwise to loosen. Turn counterclockwise to loosen. Turn counterclockwise to loosen.
(4) Pry off seal bellows and ceramic seat. Break seats (4) Pry off seal bellows and ceramic seat. Break seats (4) Pry off seal bellows and ceramic seat. Break seats
if necessary to get out since they must be if necessary to get out since they must be if necessary to get out since they must be
replaced with new parts. replaced with new parts. replaced with new parts.
(5) NEVER USE OLD SEAL PARTS. USE ONLY (5) NEVER USE OLD SEAL PARTS. USE ONLY (5) NEVER USE OLD SEAL PARTS. USE ONLY
COMPLETELY NEW SEALS. (Do not use seal COMPLETELY NEW SEALS. (Do not use seal COMPLETELY NEW SEALS. (Do not use seal
spring retainer plate on single seal pump or lower spring retainer plate on single seal pump or lower spring retainer plate on single seal pump or lower
seal of double seal pump.) seal of double seal pump.) seal of double seal pump.)
(6) For single seal pumps or if only replacing the lower (6) For single seal pumps or if only replacing the lower (6) For single seal pumps or if only replacing the lower
seal of a double seal pump, it is not necessary to seal of a double seal pump it is not necessary to seal of a double seal pump it is not necessary to
disassemble further. On a double seal pump, it disassemble further and on a double seal pump it disassemble further and on a double seal pump it
is not necessary to drain oil out of the motor is not necessary to drain oil out of the motor is not necessary to drain oil out of the motor
housing, just the seal housing. housing, just the seal housing. housing, just the seal housing.
(7) On a double seal pump, to remove the upper (7) On a double seal pump to remove the upper (7) On a double seal pump to remove the upper
seal, remove four bolts holding the bottom plate seal, remove four bolts holding the bottom plate seal, remove four bolts holding the bottom plate
and remove bottom plate. and remove bottom plate. and remove bottom plate.
(8) Remove snap ring with snap ring pliers. Pry off (8) Remove snap ring with snap ring pliers. Pry off (8) Remove snap ring with snap ring pliers. Pry off
upper seal bellows and ceramic seat. upper seal bellows and ceramic seat. upper seal bellows and ceramic seat.
(9) If no water has entered motor housing (check (9) If no water has entered motor housing (check (9) If no water has entered motor housing (check
winding with ohmmeter or megger) wipe seal winding with ohmmeter or megger) wipe seal winding with ohmmeter or megger) wipe seal
chambers thoroughly and replace seals. (Use seal chambers thoroughly and replace seals. (Use seal chambers thoroughly and replace seals. (Use seal
retainer plate on upper seal only, do not use on retainer plate on upper seal only; do not use on retainer plate on upper seal only, do not use on
lower seal.) Clean seal faces and use light on face lower seal.) Clean seal faces and use light on face lower seal.) Clean seal faces and use light on face
before installing bellows part of seal. before installing bellows part of seal. before installing bellows part of seal.
(10) Check HUVA cup seal in volute case inlet. If worn, (10) Check HUVA cup seal in volute case inlet. If worn, (10) Check HUVA cup seal in volute case inlet. If worn,
replace. replace. replace.
(11) Be sure tetraseal gasket is in position (replace if (11) Be sure tetraseal gasket is in position (replace if (11) Be sure tetraseal gasket is in position (replace if
worn) and reassemble. worn) and reassemble. worn) and reassemble.
(12) Replace oil in motor housing and seal chamber. (12) Replace oil in motor housing and seal chamber. (12) Replace oil in motor housing and seal chamber.
Use only Myers submersible oil. Use only Myers submersible oil. Use only Myers submersible oil.
(13) Be sure pump turns freely before connecting to (13) Be sure pump turns freely before connecting to (13) Be sure pump turns freely before connecting to
power. After connecting, check for proper rotation power. After connecting, check for proper rotation power. After connecting, check for proper rotation
noted under "Stator Replacement". noted under "Stator Replacement". noted under "Stator Replacement".

WIRING DIAGRAM

WIRING DIAGRAM WIRING DIAGRAM
BLACK BLACK BLACK
WHITE WHITE WHITE
GREEN GREEN GREEN
BLACK BLACK BLACK
WHITE WHITE WHITE
BROWN BROWN BROWN
115V., 208V. OR 230V. 115V., 208V. OR 230V. 115V., 208V. OR 230V.
1 PHASE, P.S.C. 1 PHASE, P.S.C. 1 PHASE, P.S.C.
BLACK BLACK BLACK
WHITE WHITE WHITE
GREEN GREEN GREEN
RED RED RED
GROUND GROUND GROUND
208/230V. - 3 PHASE 208/230V. - 3 PHASE 208/230V. - 3 PHASE
3 PHASE DUAL VOLTAGE WINDING 3 PHASE DUAL VOLTAGE WINDING 3 PHASE DUAL VOLTAGE WINDING
VOLTAGE VOLTAGE VOLTAGE BLACK BLACK BLACK
208 & 230 208 & 230 208 & 230 1 & 7 1 & 7 1 & 7
460 460 460 1 1 1
13 13 13
BLACK BLACK BLACK
WHITE WHITE WHITE
GREEN GREEN GREEN RED RED RED
BLACK BLACK BLACK
BLACK BLACK BLACK
YELLOW YELLOW YELLOW
575V. - 3 PHASE 575V. - 3 PHASE 575V. - 3 PHASE
SEAL LEAK SEAL LEAK SEAL LEAK
DETECTOR DETECTOR DETECTOR
TYP. FOR 1 & 3Ø TYP. FOR 1 & 3Ø TYP. FOR 1 & 3Ø
(DOUBLE SEAL ONLY) (DOUBLE SEAL ONLY) (DOUBLE SEAL ONLY)
BLACK BLACK BLACK
WHITE WHITE WHITE
GREEN GREEN GREEN
RED RED RED
GROUND GROUND GROUND
460V. - 3 PHASE 460V. - 3 PHASE 460V. - 3 PHASE
LEADS LEADS LEADS
WHITE RED WHITE RED WHITE RED TOGETHER TOGETHER TOGETHER
2 & 8 2 & 8 2 & 8 3 & 9 3 & 9 3 & 9 4 & 5 & 6 4 & 5 & 6 4 & 5 & 6
2 2 2 3 3 3 4 & 7, 5 & 8, 6 & 9 4 & 7, 5 & 8, 6 & 9 4 & 7, 5 & 8, 6 & 9
23833A278 23833A278
23833A278