Craftsman 390.253251 User manual

SEARS
OWNER'S
MANUAL
MODELNO.
390.253251
CAUTION:
Readand Follow
All Safety Rulesand
Operating Instructions
BeforeFirstUseof
ThisProduct.
Save ThisManual For
FutureReference.
CRRFTSMRN°
MULTI-STAGE JET PUMP
•Safety Instructior_
• Installation
•Electrical
•Operation
• Maintenance
• Repair Parts
Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
PRINTED IN U.S.A. Form No, F642-9807 (Rev. 716/98)

CONTENTS
INTRODUCTION/WARRANTY .................................. 2
MAJOR COMPONENTS .............................................. 3
PUMP PERFORMANCE ............................................... 4
INSTALLATION ........................................................ 5-8
ELECTRICAL .......................................................... 9-10
OPERATION ........................................................ 10-11
HELPFUL HINTS /MAINTENANCE ..................... 11-14
TROUBLESHOOTING GUIDE .................................. 15
REPAIR PARTS ..................................................... 16-19
INTRODUCTION
Please read our instructions before installing and using
your Deep Well Jet Pump. This will help you obtain the
full benefits of the quality and convenience built into
this equipment. It will also help you avoid any needless
service expense resulting from causes beyond our con-
trol which are not covered by our warranty.
RULES FOR SAFE INSTALLATION AND OPERATION
Carefully read and follow all safety instructions in this
manual or on pump
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 seri-
ous personal injury, death or major property damage if
ignored.
I'A_WARNINGIWarns about hazards that will or can
cause serious personal injury, death or major property
damage if ignored.
IA CAUTION ] Warns about hazards that will or can
cause ",_or_er_sona_l _iUry or property damage if ig-
nored.
The worcr'NOTICE - indicates special instructions
whick are.important but not related to hazards.
1. To avoid risk of serious bodily injury and property
damage, read safety instructions carefully before in-
stalling pump.
2. Follow local and/or national plumbing and electri-
cal codes when installing pump.
3. Keep well covered while installing pump to prevent
leaves and other debris from falling into well, con-
,taminating well and possibly damaging pump.
4. Protect pump and piping system from freezing.
Allowing pump or water system to freeze could
severely damage pump and voids warranty.
IAWARNING[ To avoid serious injury and equip-
ment damage, limit system pressure to 100
pounds per square inch (PSI) or below at all
times. Over-pressure can cause tank blowup; in-
stall relief valve capable of passing full pump vol-
ume at 100 PSI.
5. With a new well, test well for purity before use.
Consult local Health Department for procedure.
IAwARNING[Hazardous voltage. Can shock, burn,
cause death, or start fires.
6. Disconnect electrical power source before in-
stalling or working on pump.
7. Ground pump with a ground wire run from ground-
ing lug on motor to a grounded lead in the service
panel.
8. Line voltage and frequency of electrical power sup-
ply must agree with motor nameplate.
9. Use of fuses or wire smaller than size recommended
in owner's manual can cause overheating, possible
fires, and will void warranty.
10. This pump is a deep well jet pump. It is not de-
signed or intended for shallow well use. Use in a
deep well (more than 25' depth to water).

MAJOR COMPONENTS AND WHAT THEY DO
Tank and Air Volume Control
The tank serves two functions:
1. It provides a reservoir of water. Some of this water
is drawn offwhenever a house fixture is opened (so
that the pump doesn't need to start every time you
open a tap).
2. It maintains a cushion of air under pressure.
A standard tank requires an Air Volume Control
(AVLO to add air to the tank when needed. See the
instructions included with the AVC for details of in-
stallation and operation.
A Captive _tank maintains a constant precharge of
air in the tank and does not require an AVC. An annual
check on the tank pre-charge pressure is recom-
mended.
Impeller
The pump's impeller rotates wit_ the motor shaft,
causing the water to fly-__md_y centrifugal
force. The rotation of the impeller, along with the mo-
tion of the water, creates a vacuum at the center of the
impeller (the "eye" of the impeller) which pulls in
more water.
The Vertical Multi-Stage O/MS) pump has two im-
pellers; the water feeds through them one after the
other, with each impeller adding to the pressure. This
allows the VMS jet pump to pull water from greater
depths and at a higher pressure than a conventional sin-
gle stage jet pumps.
Jet
The jet is a nozzle/venturi arrangement installed in the
well which drives water up to the pump from the well,
boosting the water pressure going into the impellers.
The jet allows water to be lifted from a greater depth
than would be possible with only the impeller eye's
vacuum. In order to drive the jet, part of the discharge
stream from the pump is diverted back _down the
hole" to the jet to help lift water from the well into the
pump suction.
Pressure Regulator
The pressure regulator is adjusted at installation to di-
vert the correct amount ofwater back to the jet for the
most efficient operation. Under certain conditions, the
pressure regulator may require adjustment during the
pump's life (see Page 10) to restore or maintain the
pump's efficiency.
Pressure Switch
The pressure switch automatically starts the pump
when the pressure in the tank drops to 40 pounds per
square inch (PSI) and stops the pump when the tank
pressure reaches 60 PSI.
Adapter Flange
The VMS pump is equipped with an adapter flange.
This adapter facilitates installation and removal of the
pump without disturbing piping. See Pages 6 and 7for
more information.
Pressure Relief Valve
Under certain conditions, VMS pumps can generate
very high pressure. The pressure relief valve is installed
to make sure that the pressure in the system does not
exceed the pressure which the system can carry safely.
The pressure relief valve must be able to pass all the
water the pump can produce at the system's rated pres-
sure. Install a relief valve (Sears Stock No. 27229) set
to open at 75 PSI. between the pump and the tank.
There should be no shutoff valves between the pump
and the relief valve. See Figures 11 and 12, Page 8, for
more information.
Pump Mounting
The pump base has three equally spaced 3/4" NPT
threaded sockets. These will take threaded pipe for
legs, to allow enough room to make piping connec-
tions under the pump.
In the case of a single pipe installation (see below), the
pump can be placed directly over the well, using the
offset nipple furnished with the casing adapter to con-
nect the pump to the well head.
Piping
When installed on a'double pipe' jet, one pipe is the
pressure or drive pipe; this pipe sends water down into
the well to the jet. The other pipe is the suction pipe;
this pipe carries water up to the pump suction from
the jet. Because of the pressure requirements and
depth of multi-stage jet pump installations, use the
chart below for pipe selection.
When installed on a singe pipe jet, the well casing
serves as the drive pipe, carrying water to the jet. The
drop pipe inside the well is the suction pipe, carrying
water up to the pump from the jet.
Use a'single pipe' system for a 2" or 3" well; use a'dou-
ble pipe' system for a 4_or larger well. See Pages 6 and
7for details. Follow instructions packed with jet pack-
age to get proper nozzle and venturi combination for
your pumping depth.
Use 1-1/4" pipe for both suction and drive pipes. A 1"
nipple, a 1-1/4_xl" facing bushing, and a 1-1/4" cou-
pling are included in the jet package. These must be
used with the jet. (See Figure 8, Page 6, for installation
details.)
3

PUMP PERFORMANCE
Multi-Stage Pump
Pump Performance (in gallons per minute)
Pump
Stock
No.
390.253251
1HP
Jet Discharge
Pkg. Pressure
No. P.S.I.
4O
29670* 60
4O
29902"*t 60
29660*** 40
60
40 60 70 80
11.3 10.0 8.8 7.6
10.6 8.6 7.5 6.5
11.7 11.1 10.2 9.2
11.0 9.5 8.6 7.8
11.7 11.1 10.2 9.2
11.0 9.5 8.6 7.8
Pumping Depth In Feet
1_ 110 120 140 1_ 1_ 210
6.5 5.0 5.0 5.0 4.2 3.5 2.0
5.5 4.8 4.8 4.7 3.9 2.7 1.5
7.8 6.4 5.1 5.0 4.5 4.0 3.2 2.1
6.6 5.4 4.7 4.6 4.2 3.4 2.6 1.7
7.8 6.4 5.1 5.0 4.5 4.0 3.2 2.1
6.6 5.4 4.7 4.6 4.2 3.4 2.6 1.7
Use 160 PSI Min. Rating Plastic Pipe.
* Jet Package No. 29670 - 2" Single Pipe (use 1-1/4" galvanized pipe).
** Jet Package No. 29902 - 3" S_ingle Pipe (use 1-1/4" galvanized pipe).
*** Jet Package No. :59__ Pipe.
1 Must be ordered through Sears Product Service, 1-800-366-7278.
4

INSTALLATION
Use New Pipe for Best Results.
Clean Rowl
1O960697
From
Well
Figure I - No Dirt or Scale in Suction Pipe
1100 0697
Figure 2 - Foot Valve Must Work Freely
If Air Pockets Fon'n, Water Won't Flow.
Keep Pipe Straight and Angled up to Pump.
1t01 _1_7
Figure 3 - No Air Pockets in Suction Pipe
Pipe Joint
No Air Leaks Compound Will
in Suction Pipe. _Plastic.
IfAir Flows
WaterWon't
!1:T
,hltl Deep well ismore
than 25' (7.6M)
,tto water with
pump running.
Well _ 1
Casing_
Foot--._._
Valve_'I _I
Strainer_
Do not use on shallow wells!
(25 feet or less in depth)
Figure 5 - Use Pump On Deep Well Only
)
822b 0697
NOTICE: For proper performance, pump MUST be
matched to ejector and to well depth. Use this pump
on wells 25' to 210' deep.
1. Long runs and many fittings increase friction and re-
duce flow. Locate pump as close to well as possible:
use as few elbows and fittings as possible.
2. Be sure well is clear of sand. Sand will plug the
pump and void the warranty.
3. Protect pump and all piping from freezing. Freezing
will split pipe, damage pump and void the warranty.
Check locally for frost protection requirements
(usually pipe must by 12" below frost line and
pump must be insulated).
4. Be sure all pipes and foot valve are clean and in
good shape.
5. No air pockets in suction pipe.
6. No leaks in suction pipe. Use Teflon tape or Plasto-
Joint Stik to seal pipe joints.
7. Match pump to well.
IMPORTANT: Flow into well must at least equal
flow out through pump!
8. Unions installed near pump and well will aid in ser-
vicing. Leave room to use wrenches.
IA CAUTION IMotor normally operates at high temper-
ature and will be too hot to touch. It is protected from
heat damage during operation by an automatic internal
cutoff switch. Before handling pump or motor, stop
motor and allow it to cool for 20 minutes.
Use Teflon Tape.
!:igure 4 - Suction Pipe Must Not Leak
1102 0697