MYERS VRS10A-11, VRS10M-11, VRS10A-21, VRS10M-21 Installation And Service Manual

VR1 SERIES

GRINDER PUMPS

INSTALLATION AND SERVICE MANUAL

1 HP Grinder Pump for Residential Applications.

NOTE! To the installer: Please make sure you provide this manual to the owner of the equip ment or to the responsible
party who maintains the system.

Part # 23833A700 | © 2017 Pentair plc | 05/30/17

USAGE

CAUTION!

The VR1 Series is a submersible wastewater grinder
pump designed specifically for individual residential
applications. The pumps are to be used for domestic
sewage only and are not to be used for pumping
commercial or industrial sewage such as from motels,
schools, apartments, factories, etc. THIS PUMP IS

NOT FOR USE IN HAZARDOUS LOCATIONS!

INSPECTING PUMP

Before making any piping or electrical connections,
check the pump for shipping damage or cracks. Insert
allen key into cutter retaining bolt and turn clockwise
to ensure cutters and impellers do not rub. Do not
turn cutter with fingers.

POWER SUPPLY

The VR1 Series grinder pump should be connected to
a 115 or 230 volt, single-phase, 60 Hz power source.
The pump will draw approximately 7.4, 5.3 amperes
at minimum flow and 12.5, 7.6 full load amperes.
The pump must be connected to a grounded power
socket. DO NOT cut off the ground pin from the
power cord plug.

POWER CORD

A 20 foot power cord is attached to the grinder pump
via two insulated quick-disconnect terminals and a
ground terminal. To replace a cord, begin by slightly
loosening cord nut in the cord cap plate. Remove
cord cap plate from the motor housing and carefully
pull the power leads up out of the motor housing and
disconnect them from the motor leads. Disconnect
the ground wire from the cap plate and continue to
completely loosen the cord nut from the cap.

THE VR1 SERIES GRINDER PUMP SHOULD
NEVER BE WORKED ON WITHOUT FIRST
DISCONNECTING THE POWER CORD.

OIL TYPE

The motor housing contains dielectric transformer oil
to provide good heat transfer and lubrication of ball
bearings; no other lubrication is required. Oil level may
be checked by removing the oil plug from the top of
the motor housing. The oil level should be filled to
the bottom of the end shield. Do not overfill with oil.
Only dielectric transformer oil obtained from a Myers®
authorized service center should be used.

PUMP SWITCH INSTALLATION
INSTRUCTIONS

NOTE: In accordance with third party approval, pump

must be submerged a minimum of 8-5/8" from bottom
of the legs on volute case during operation.

Mounting the Switch

1. Determine pumping range for installation. Do not
tether less than 3-1/2" from pipe.

2. Tighten strap around discharge pipe keeping
switch cable between strap and pipe to
prevent slippage.

3. Space small ties at least 1" apart. To readjust ties,
press small tie tabs down.

4. To lock releasable tab, run remaining strap
between tab and head. Tuck strap back
through head.

To install new cord, feed terminals through cord cap
plate and reconnect power terminals. Reconnect
ground terminal to the bottom side of the cap plate.
Carefully feed wires back into the motor housing and
fasten the cord cap plate to the motor housing. Lastly,
tighten the cord nut into the cap plate. Tighten firm,
do not overtighten.

The power cord should be replaced if it has
been damaged in any way or the cord jacket has
become brittle.

MOTOR TYPE

The VR1 Series grinder pump contains a 3/4 frame,
1 hp, single-phase, 60 Hz, 3450 rpm, capacitor start,
capacitor run motor with Class F insulation and built-in,
on-winding overload protection. Motor has upper and
lower ball bearings and is oil-cooled and lubricated.

Piggyback Plug Install

Electrical outlet must not be located in

pump chamber.

Electrical outlet voltage, piggyback plug voltage,

and pump voltage must match.

1. Follow steps 1 through 4 of “Mounting the Switch.”

2. Insert switch’s piggyback plug into outlet.

3. Plug pump into piggyback plug.

4. Check installation. Allow system to cycle to ensure
proper operation.

SAFETY WARNINGS

WARNING! Risk of electrical shock. Pumps are

supplied with a grounding conductor and grounding­type attachment plug on the power cord. To reduce
the risk of electrical shock, be certain that it is
connected only to properly grounded, grounding­type receptacle. DO NOT cut off ground pin or use
an adapter fitting. DO NOT use an extension cord

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with this pump. When wiring this pump follow all local
electrical, safety codes and ordinances as well as
most recent National Electric Code (NEC-ANSI/NFPA).

The VR1 Series grinder pumps have a GROUND
WIRE that is connected to a screw in the metal motor
housing. This wire goes to the receptacle or control
box which must be connected to a good outside
GROUND such as a metal water pipe or GROUND
STAKE driven at least 8 feet into the ground.

CALIFORNIA PROPOSITION 65 WARNING:

This product and related accessories
contain chemicals known to the State of
California to cause cancer, birth defects or other
reproductive harm.

DISMANTLING PUMP FOR
REPLACEMENT PARTS

Before dismantling pump for replacement parts, clean
pump thoroughly.

REPLACING STATIONARY CUTTER PLATE
AND ROTATING CUTTER

All repairs must be done at the factory or at an
authorized Myers service facility.

CAUTION!

DISCONNECT ALL POWER AND CONTROL
WIRES TO MOTOR AT CONTROL PANEL BEFORE
STARTING DISASSEMBLY OPERATIONS. NEVER
RELY ON OPENING CIRCUIT BREAKER ONLY.

DISASSEMBLY OF STATIONARY CUTTER
PLATE AND ROTATING CUTTER

1. Remove retaining washer and screw from end of

shaft. A screwdriver can be used to hold the shaft
in place by wedging it between one of the four
socket head cap screws and the rotating cutter
while loosening the screw.

2. Using a rubber mallet, or soft metal hammer, bump

rotating cutter in counterclockwise direction as
thread is right-hand. Unthread rotating cutter from
shaft. Be careful to not lose ring shims that space
the rotating cutter from the stationary cutter plate.

3. Remove four socket head cap screws holding

the stationary cutter plate to the volute. Remove
stationary cutter from volute. If stationary cutter
is stuck, the socket head cap screws can be
threaded into tapped back-off hole in plate.
Tighten screws to remove plate from volute.

4. Inspect rotating cutter and stationary cutter plate

for wear and replace if worn.

5. Make sure pocket in volute is clean and reinstall

stationary cutter plate using the four socket head

®

cap screws. Apply blue Loctite
not overtighten cap screws.

6. Replace ring shims (if removed from the shaft)
and thread rotating cutter onto shaft. Make sure
threads on shaft are clean and use Never-Seez®
or other graphite compound on threads before
replacing rotating cutter.

7. Using a rubber mallet, or soft metal hammer, bump
rotating cutter in clockwise direction to make sure
it is seated on the impeller.

8. To ensure proper operation of the cutter
mechanism, the gap between the stationary cutter
plate and rotating cutter must be no more than
.008". To check the gap use a .008" feeler gauge.
If the .008" feeler gauge does not fit between the
surface of the stationary cutter and rotating cutter
and the motor shaft turns freely, the gap is set
correctly. If the .008" feeler gauge fits between the
surfaces, shims must be removed to close the gap

9. Replace retaining washer and screw in the end of
the shaft. Be sure screw is tight. A screwdriver can
be used to hold the shaft in place by wedging it
between one of the four socket head cap screws
and the rotating cutter while tightening the screw.

10. Be sure shaft turns freely after reassembly. Some
drag will occur due to the seal, but there should
be no binding or tight spots when turning the
rotating cutter.

11. If rotating cutter rubs or drags on stationary cutter
plate, recheck gap and re-shim rotating cutter.

to the threads. Do

TO REPLACE CAPACITORS ONLY

1. Remove oil fill plug near the top of motor housing
and pour oil out.

2. Loosen the cord nut on power cord until
cord is loose enough to push cord down into
motor housing.

3. Remove four bolts from motor housing and bump
housing with a plastic hammer to loosen. Lay
pump on its side.

4. Remove the housing carefully to be sure that
enough cord is pushed into the housing so as not
to create tension on cord.

5. Slide motor housing up far enough to expose the
capacitors and to be able to lay the housing down.

6. Disconnect wiring from capacitor and loosen
capacitor clamp and slide capacitor out. Replace
with new capacitor, tighten clamp and reconnect.

7. Check all wiring connectors to be sure they
are secure.

8. Be sure O-ring is in place.

9. Slide motor housing back onto pump while pulling
the cord out slowly. Assemble motor housing with
four bolts.

10. Reassemble cord nut. Be sure washers are seated
and cord is pulled up against the washers. Tighten
nut securely.

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