STA-RITE MSC-6 User manual

OWNER’S MANUAL
Multi-Stage Deep Well Jet Pumps
20 100
80
60
40
©2001, Sta-Rite Industries, Inc. PRINTED IN U.S.A. S757-1 (Rev. 10/31/01)
293 Wright Street, Delavan, WI 53115
“MS” Series
Installation/Operation/Parts
For further operating, installation, or maintenance assistance:
Call 1-262-728-5551

Safety 2
READ AND FOLLOW
SAFETY INSTRUCTIONS!
This is the safety alert symbol. When you see this
symbol on your pump or in this manual, look for
one of the following signal words and be alert to the
potential for personal injury:
warns about hazards that will cause serious
personal injury, death or major property damage if
ignored.
warns about hazards that can cause serious
personal injury, death or major property damage if
ignored.
warns about hazards that will or can cause
minor personal injury or property damage if ignored.
The label NOTICE indicates special instructions which
are important but not related to hazards.
Carefully read and follow all safety instructions in this
manual and on pump.
Keep safety labels in good condition.
Replace missing or damaged safety labels.
Make workshops childproof; use padlocks and master
switches; remove starter keys.
ELECTRICAL SAFETY
Capacitor voltage may be hazardous. To
discharge motor capacitor, hold insulated handle screw-
driver BY THE HANDLE and short capacitor terminals
together. Do not touch metal screwdriver blade or
capacitor terminals. If in doubt, consult a qualified elec-
trician.
GENERAL SAFETY
Do not touch an operating motor. Modern
motors are designed to operate at high temperatures. To
avoid burns when servicing pump, allow it to cool for 20
minutes after shut-down before handling.
Do not allow pump or any system component to freeze.
Freezing may damage system, leading to injury or flood-
ing. Allowing pump or system components to freeze will
void warranty.
Relief valve must be capable of passing full pump flow at
75 PSI.
Pump water only with this pump.
Periodically inspect pump and system components.
Wear safety glasses at all times when working on pumps.
Keep work area clean, uncluttered and properly lighted;
store properly all unused tools and equipment.
Keep visitors at a safe distance from the work areas.
WARNING
Hazardous pressure!
Install pressure relief
valve in discharge pipe.
Release all pressure on
system before working on
any component.
WARNING
Hazardous voltage.
Can shock, burn, or
cause death.
Ground pump before
connecting to power
supply. Disconnect power
before working on pump,
motor or tank.
Wire motor for correct
voltage. See “Electri-
cal” section of this manual
and motor nameplate.
Ground motor before
connecting to power
supply.
Meet National Electri-
cal Code, Canadian
Electrical Code, and local
codes for all wiring.
Follow wiring instruc-
tions in this manual
when connecting motor to
power lines.

Table of Contents 3
LIMITED WARRANTY
Sta-Rite warrants to the original consumer of the products listed below, that they will be free from defects in material and work-
manship for the Warranty Period from the date of original installation or manufacture as noted.
Product Warranty Period
Water Systems Products – jet pumps,
whichever occurs first:
small centrifugal pumps, submersible pumps 1 year from date of original installation, or
and related accessories 2 years from date of manufacture
Con-Aire®Tanks 5 years from date of original installation
Epoxy-Line Tanks 3 years from date of original installation
Sump/Sewage/Effluent Products 1 year from date of original installation, or
2 years from date of manufacture
Our warranty will not apply to any product that has been subject to negligence, misapplication, improper installation or main-
tenance. In the event a three phase submersible motor is operated with single phase power through a phase converter, or if three-
leg ambient compensated, extra-quick trip overload relays of recommended size are not used, our warranty is void.
Buyer’s only remedy and Sta-Rite’s only duty is to repair or replace defective products (at Sta-Rite’s choice). Buyer agrees to pay
all labor and shipping charges associated with this warranty and to request warranty service through the installing dealer as soon
as a problem is discovered. If warranty service is requested more than 30 days after the Warranty Period has ended, it will not
be honored.
STA-RITE SHALL NOT BE LIABLE FOR ANY CONSEQUENTIAL, INCIDENTAL, OR CONTINGENT DAMAGES WHATSOEVER.
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESS WARRANTIES. IMPLIED WAR-
RANTIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, SHALL NOT EXTEND BEYOND THE WARRANTY PERIOD PROVIDED HEREIN.
Certain states do not permit the exclusion or limitation of incidental or consequential damages or the placing of limitations on
the duration of an implied warranty, therefore, the limitations or exclusions herein may not apply. This warranty sets forth spe-
cific legal rights and obligations, however, additional rights may exist, which may vary from state to state.
Supersedes all previous publications.
Sta-Rite Industries, Inc. 293 Wright St., Delavan, WI 53115
Page
General Safety .....................................................................................................2
Warranty..............................................................................................................3
Installation........................................................................................................4-7
Electrical...........................................................................................................8-9
Operation .....................................................................................................10-11
Maintenance.................................................................................................12-13
Troubleshooting..................................................................................................14
Repair Parts .................................................................................................15-16

Pump
Body
From
Well
Dirt and Scale Plug Pump and Pipes!
Use New Pipe for Best Results.
Clean Flow!
No Sags
Sags Allow Air Pockets
If Air Pockets Form, Water Won’t Flow.
Keep Pipe Straight and Angled up to Pump.
Figure 1: No Dirt or Scale in Suction
Pipe
Figure 2: Foot Valve Must Work Freely
Figure 3: No Air Pockets in Suction
Pipe
Installation 4
1102
0
No Air Leaks
in Suction Pipe.
Pipe Joint
Compound Will
Damage Plastic.
If Air Flows
Water Won’t
Use Teflon Tape.
Figure 4: Suction Pipe Must Not Leak
BEFORE YOU INSTALL YOUR PUMP
NOTE: For proper performance, pump MUST be matched to ejector and to
well depth. Use shallow well installation for wells up to 25 ft depth to
water and deep well ejector for depths up to 130 ft.
Step 1. Long runs and many fittings increase friction and reduce flow.
Locate pump as close to well as possible: use as few elbows and fit-
tings as possible.
Step 2. Be sure well is clear of sand. Sand will plug the pump and void the
warranty.
Step 3. Protect pump and all piping from freezing. Freezing will split pipe,
damage pump and void the warranty. Check locally for frost protec-
tion requirements (usually pipe must by 12” below frost line and
pump must be insulated).
Step 4. Be sure all pipes and foot valve are clean and in good shape.
Step 5. No air pockets in suction pipe.
Step 6. No leaks in suction pipe. Use Teflon tape or Plasto-Joint Stik to seal
pipe joints.
Step 7. Match pump to well.
IMPORTANT: Flow into well must at least equal flow out through
pump!
Step 8. Unions installed near pump and well will aid in servicing. Leave
room to use wrenches.
Step 9. Plug 1” drive port when installing on shallow well.
SHALLOW WELL/CENTRIFUGAL INSTALLATION
No ejector is used in this case, plug the smaller of the two inlet ports, using
the larger for the suction pipe. Refer to Figure 6 for installation tips.
Maximum depth to water for shallow well/centrifugal operation is 25 feet.
NOTE: To avoid pump overloading and motor failure, install a flow control
valve at the discharge to limit flow to 20 gallons per minute.
Well
Casing
Foot
Valve &
Strainer
Deep well is more
than 25' (7.6M)
to water with
pump running.
Figure 5: Double Pipe Deep Well
Be sure
entire
well
point is
below
water.
Drive
Coupling
Drive
Point
Check
Valve
1" NPT
Plug
Well
Casing
1" NPT
Plug
Foot
Valve &
Strainer
Shallow well is less
than 25' (7.6M)
to water with
pump running.
822 0697
Figure 6: Cased Shallow Well
and Drive Point Shallow Well

Installation 5
PIPING IN THE DEEP WELL
See Figures 7 and 8.
NOTE: Deep well installations are either single pipe (2” wells) or double
pipe (4” and larger wells). In a double pipe installation, the larger pipe is
the suction pipe and the smaller pipe is the drive pipe (very deep wells
may use suction and drive pipes of the same diameter).
Plastic pipe is ideal for double pipe installations. Due to its light weight, it
is easy to handle and does not usually require a block and tackle for instal-
lation and removal.
PLASTIC PIPE INSTALLATION – DOUBLE PIPE
NOTE: Use Teflon tape on all male threads on plastic pipe and fittings to
prevent air leaks in suction piping.
Step 1. Inspect ejector to make sure that nozzle and venturi openings are
clean and clear.
Step 2. Inspect pipe for any foreign matter or obstructions.
IMPORTANT: Make sure that no foreign matter enters pipe open-
ings while installing pump.
Step 3. Make sure foot valve operates freely: attach to ejector with a close
nipple. Use Teflon tape on male threads.
Step 4. Install nozzle and venturi in deep well ejector.
Step 5. Using Teflon tape on male threads, install special plastic pipe
adapter (supplied with ejector) by screwing adapter into 1-1/4”
tapped hole in ejector body (see Figure 7A).
Step 6. Thread a 1” plastic pipe adapter into the 1” tapped hole in ejector
body (see Figure 7A).
Step 7. Install sufficient plastic pipe in well casing to place ejector at the
proper depth. (Your well driller should supply this information.)
IMPORTANT: as a guide, the ejector should be set at least 10 to
20 feet below the lowest water level with pump running, if possi-
ble, but always at least five feet from the bottom of the well.
Step 8. Tighten all hose clamps securely on plastic pipe. Use two clamps
per joint to prevent air leaks into suction pipe. Clamp screws
should be on opposite sides of the pipe. Fill pipes with water to
make sure that foot valve and connections do not leak.
Step 9. Install sanitary well seal on top of well casing; use steel nipple
through well seal as shown in Figure 7A.
IMPORTANT: align locating lugs on adapter flange and pump base
so that pump discharge will be aligned with piping.
Step 10. Install 1” nipple in one side of adapter flange. Slide threadless
coupling down over drive pipe from well. Thread adapter flange
onto suction pipe from well and align nipple and drive pipe.
Step 11. Slide threadless coupling up and secure nipple to drive pipe.
Step 12. Remove paper backing from adhesive gasket. Apply gasket to
adapter flange, making sure that holes line up.
Step 13. Align locating lugs on pump base with locating lugs on adapter
flange; attach pump to flange with cap screws provided.
Step 14. See “Discharge Pipe Sizes” for information regarding correct dis-
charge pipe size.
Figure 7
Pump
Gasket
Adapter Flange
Threadless
Coupling
Sanitary
Well Seal
Steel Pipe Nipple
Coupling
1" Plastic Drive Pipe
1" Plastic Pipe Adapter
Ejector Assembly
Foot Valve & Strainer
1-1/4" Plastic Suction Pipe
Special 1-1/4" Plastic Pipe
Adapter. (Supplied with Ejector)
A-OFFSET INSTALLATION
PLASTIC PIPE SHOWN
Pump
Gasket
Adapter Flange
Sanitary
Well Seal
1" Drive Pipe
Ejector Assembly
Foot Valve & Strainer
1-1/4" Suction Pipe
Threadless Coupling
B-OVER THE WELL INSTALLATION
STEEL PIPE SHOWN
474 0194

SINGLE PIPE EJECTOR INSTALLATION
Single pipe installations require (see Figure 8):
a. Galvanized steel pipe
b. Leather packer-type ejector with built-in foot valve
c. Turned couplings (supplied with packer-type ejector)
d. Well casing adapter.
Step 1. Connect ejector to first length of pipe. Use pipe joint compound
sparingly on male threads.
Step 2. Lower pipe into casing. Use special turned couplings (included
with 2” single pipe ejector package) to increase water flow. Use
pipe joint compound sparingly on male couplings threads.
NOTE: Fill pipe with water as each length is added to be sure foot valve
and connections do not leak.
Step 3. Add lengths of pipe until the ejector reaches the proper depth.
(Your well driller should supply this information.)
IMPORTANT: as a guide, the ejector should be set at least 10 to 20 feet
below the lowest water level with pump running, if possible, but always at
least 5 feet above the bottom of the well (see Figure 8).
Step 4. To properly seat the cup seals, after the ejector is correctly posi-
tioned move the assembly up and down slightly. Water pressure in
the casing will then soak the cup seals (see Figure 8). They should
seal within 2-3 hours after installation.
Step 5. With ejector set, install well casing adapter. Remove pipe holder.
Align locating lugs and tighten adapter to form seal with well cas-
ing.
DISCHARGE PIPE SIZES
Step 1. If increasing discharge pipe size, install reducer in pump discharge
port. Do not increase pipe size by stages.
Step 2. When the pump is set away from the points of water use, the dis-
charge pipe size should be increased to reduce pressure losses
caused by friction.
• Up to 100 ft run: Same size as pump discharge port.
• 100 ft. to 300 ft run: Increase one pipe size.
• 300 ft. to 600 ft run: Increase two pipe sizes.
Figure 8
Well Casing
serves as
Drive Pipe
Suction
Pipe
Venturi
Nozzle
Ejector
JET NO. J32P- 24
Casing Adapter
(Use gasket
between adapter
and pump flange)
Cup
Leathers
Pump
mounted
on Casing
Adapter
5 Feet
or more
10 to 20 Feet
Water level
with pump
running
2357b 0697
Installation 6

Installation 7
PRESSURE TANK INSTALLATION – DEEP WELL
The Pressure Tank provides a reservoir of water under pressure and main-
tains cushion of air pressure to prevent pipe hammering and possible dam-
age to plumbing components. When water is drawn off through house fix-
tures, the pressure in the tank is lowered and the pressure switch starts the
pump.
STANDARD TANK CONNECTION
When a standard tank is used, an air volume control (AVC) adds air to the
tank when it is needed. See Figure 10 for typical standard tank installation.
To connect AVC to pump, thread a 1/4” compression fitting into tapped
hole on the front of the pump. Cut tubing to length to reach AVC; assemble
to fitting on pump and to AVC on tank. See installation instructions provid-
ed with tank and AVC for details.
PRECHARGED TANK CONNECTION
When a precharged tank is used, no AVC is necessary. See Figure 10 for
typical precharged tank installation. A precharged tank contains a factory
provided air charge.
IMPORTANT: your pump pressure switch is set for a 30-50 PSI range and
requires a tank pre-charge of 28 PSI for proper operation (see Figure 11).
See tank owner’s air charge. An annual check on tank charge is recom-
mended.
Figure 9: Pump With Standard Tank
Air Volume
Control
(AVC)
Standard Tank
AVC
Port
2355b 0697
1" Discharge
Relief Valve
Pressure
Regulator
Well Seal
AVC Tubing
Figure 10: Pump With Pre-charged
Tank
20 100
80
60
40
Relief Valve
Pressure
Regulator
1" Discharge
Pre-Charged
Pressure Tank
2358b 0697
Figure 11: Checking Tank Pre-charge
1054 0697
10
20
30
Check Pressure With
Tire Gauge

Electrical 8
Hazardous voltage. Can shock, burn, or kill. Connect ground
wire before connecting power supply wires. Use the wire size (including
the ground wire) specified in the wiring chart. If possible, connect the
pump to a separate branch circuit with no other appliances on it.
Explosion hazard. Do not ground to a gas supply line.
WIRING CONNECTIONS
Fire hazard. Incorrect voltage can cause a fire or seriously
damage the motor and voids the warranty. The supply voltage must be with-
in ±10% of the motor nameplate voltage.
NOTICE: Dual-voltage motors are factory wired for 230 volts. If necessary,
reconnect the motor for 115 volts, as shown. Do not alter the wiring in sin-
gle voltage motors.
Install, ground, wire, and maintain your pump in compliance with the
National Electrical Code (NEC) or the Canadian Electrical Code (CEC), as
applicable, and with all local codes and ordinances that apply. Consult
your local building inspector for code information.
Disconnect power before working on pump, motor, pressure switch, or wiring.
Figure 12: Motor wiring connections through Pressure Switch. Match motor voltage to line voltage.
Your Motor Terminal Board (under the motor end cover)
and Pressure Switch look like one of those shown below.
Convert to 115 Volts as shown. Do not change motor
wiring if line voltage is 230 Volts or if you have a single
voltage motor. Connect power supply as shown for your
type of switch and your supply voltage.
Pull plug
straight
out from
terminal
board.
1.
1.
2.
2.
Plug in again
with arrow
on plug
pointing to
'115 Volts'.
A
L1
230 Volts
115 Volts
A
L1
230 Volts
115 Volts
Ground
Screw
3962 0401 A
115 V
230 V
230 Volt to 115 Volt Conversion. Move plug to change voltage.
Ground
Screw
230V
115V
230V
115V
A
A
L2
L2
L1
L1
230V
115V
A
A
L2
L2
L1
L1
230V
115V
Power Supply
Wires
230 Volt to 115 Volt Conversion. Move plug to change voltage.
Clamp the power cable to prevent strain
on the terminal screws.
Connect the green (or bare copper) ground wire
to the green ground screw.
Motor wires connect here.
Clamp the power cable to prevent strain
on the terminal screws.
Connect the green (or bare copper) ground wire
to the green ground screw.
Motor wires connect here.
3187 0398
Power supply wires connect here.
230 Volt: Connect 2 hot wires (black and red)
here and cap the white (neutral) wire. It does
not matter which wire goes to which screw.
115 Volt: Connect one hot wire (black or red)
to one of these screws (it doesn't matter
which one). Connect the white (neutral) wire
to the other screw. Cap any remaining
black or red wires.
Power supply wires connect here.
230 Volt: Connect 2 hot wires (black and red)
here and cap the white (neutral) wire. It does
not matter which wire goes to which screw.
115 Volt: Connect one hot wire (black or red)
to one of these screws (it doesn't matter
which one). Connect the white (neutral) wire
to the other screw. Cap any remaining
black or red wires.

Electrical 9
WIRING CHART – Recommended Wire and Fuse Sizes
BRANCH DISTANCE IN FEET FROM MOTOR TO METER
MAX. FUSE* 0 51 101 201
MOTOR VOLTS LOAD RATING TO TO TO TO
HP AMPS AMPS 50 100 200 300
1/2 115 13.0 20 12 12 10 8
1/2 230 6.5 15 14 14 14 14
3/4 115 14.8 20 12 12 8 6
3/4 230 7.4 15 14 14 14 14
1 115 19.2 25 10 10 8 6
1 230 9.6 15 14 14 14 12
1-1/2 230 12.0 15 14 14 14 12
2 230 11.5 15 14 14 14 12
(*)Time delay fuse or circuit breakers are recommended in any motor circuit.
Connection Procedure:
Step 1. Connect the ground wire first as shown in Figure 12. The ground
wire must be a solid copper wire at least as large as the power sup-
ply wires.
Step 2. There must be a solid metal connection between the pressure
switch and the motor for motor grounding protection. If the pres-
sure switch is not connected to the motor, connect the green
ground screw in the switch to the green ground screw under the
motor end cover. Use a solid copper wire at least as large as the
power supply wires.
Step 3. Connect the ground wire to a grounded lead in a service panel, to a
metal underground water pipe, to a metal well casing at least ten
feet (3M) long, or to a ground electrode provided by the power
company or the hydro authority.
Step 4. Connect the power supply wires to the pressure switch as shown in
Figure 12.

Operation 10
PRIMING THE PUMP
NEVER run pump dry. Running pump without water may
cause pump to overheat, damaging seal and possibly causing burns to per-
sons handling pump. Fill pump with water before starting.
NEVER run pump against closed discharge, to do so can boil
water inside pump, causing hazardous pressure in unit and possibly scald-
ing persons handling pump.
NOTE: Open water system faucets before priming pump for the first time.
Step 1. Remove pressure gauge.
a. Close regulator valve (turn clockwise - see Figure 13).
b. Fill pump and suction pipe with water (Figure 13).
c. Replace pressure gauge, using Teflon tape on thread; tighten
gauge.
IMPORTANT: If a priming tee and plug have been provided for a long hori-
zontal run, be sure to fill suction pipe through this tee and replace plug.
(Don’t forget to teflon tape the plug.)
Step 2. Start Pump:
Pressure should build rapidly to 50 pounds per square inch or more
as ejector and pump prime.
IF NO PRESSURE OR NO WATER, REPEAT Step No. 1 (above) two or three
times to remove entrapped air from the suction pipes.
Step 3. If, after priming pump several times, no water is pumped, check the
following:
a. Suction pipe in the water and has no leaks.
NOTE: Air can leak in even where water won’t leak out. Make
sure all joints are tight.
b. Control valve, check valve, or foot valve installed and operating
correctly.
c. Pump trying to lift water more than 25 feet (shallow well) or
more than rated lift for deep well ejector used (including com-
pensation for horizontal offset).
d. Be sure pump is not airlocked. In offset installations, pump suc-
tion port should be highest point in suction pipe; there should be
no sags in suction pipe (run it straight and at a slight angle
upward from well head to pump).
NOTE: For deep well installation, go to Step 4 (Page 11). Shallow well
installations go to Step 6 (Page 11).
20 100
80
60
40
2361a 0697
Figure 13A: Close Regulator
2360a 0697
Figure 13B: Fill Pump with Water
20 100
80
60
40
1030a 0697
ON
Figure 13D: Adjustor Regulator
Figure 13C: Start Pump