Craftsman 390.251883 User Manual
SEARS
OWNER'S
MANUAL
MODEL NO.
390.251483
390.251883
CAUTION:
Read and Follow
All Safety Rules and
Operating Instructions
Before First Use of
This Product.
Save This Manual For
Future Reference.
Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
PRINTED IN U.S.A.
CRflFTSMflN^
PROFESSIONAL
“HYDROGLASS”®
SHALLOW WELL JET PUMP
• Safety Instructions
• Installation
• Operation
• Troubleshooting
• Repair Parts
Form No. F642-9906 (Rev, 4/18/01)
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
A
A DANGER
A WARNING
A CAUTION
and be alert to the potential for personal injury:
DANGER warns about hazards that will cause serious personal
injury, death or major property damage if ignored.
WARNING warns about hazards that will or can cause serious
personal injury, death or major property dam^e if ignored.
CAimON warns about hazards that will or can cause minor per
sonal injury or property damage if ignored. .
The label NOTICE indicates special instructions which are im
portant 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.
Relief valve must be capable of passing full pump flow at 75 PSI.
Pump water only with this pump.
Electrical Safety
Wire motor for correct
A
A WARNING
Hazardous voltage.
Can shock, burn, or
cause death.
Ground pump before
connecting to power
supply.
Make workshopj childproof; use padlocks and master switches;
remove starter keys.
voltage. See “Electrical”
section of this manual
and motor nameplate.
Ground motor before
connecting to power
supply.
Meet National Elect
rical Code and local
codes for all wiring.
^ Follow wiring instruc
tions in this manual
when connecting mo
tor to power lines.
General Safety
Do not allow pump, pres,sure tank, piping, or any other system
component containing water to freeze. Freezing may damage sys
tem, leading to injuiy' or flooding. Allowing pump or system com
ponents to freeze will void warranty.
General Safety
A WARNING
Hazardous pressure!
Install pressure relief
valve in discharge pipe.
Release all pressure on
system before working on
any component.
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.
A WARNING pujnp body may explode if used as a booster
pump unless reUef valve capable of passing full pump flow
at 75 PSI (517 kPa) is installed.
A CAUTION j^jotor normally operates at high temperature 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.
Model
No.
390.251483
390.251883
TABLE I - Pump Performance (in Gallons per Minute)
Pumping Depth in Feet
5’ 10’ 15’
8.2
10.9 10.4 8.6
Description
1/2 HP S.W. Jet
3/4 HP S.W. Jet
Suet.
1-1/4"
1-1/4”
Disch.
1 ”
1"
Discharge
Pressure PSI
40
40
7.3
6.2
20’
5,0
7.5
CONTENTS
Safety.......................................................................................................... 2
W ananty/Introduction.............................................................................3
Pump Performance................................................................................... 3
Major Components............................................................................... 3-4
Piping..........................................................................................................4
Electrical..................................................................................................... 5
Installation..................................................................................................6
Operation....................................................................................................6
Maintenance............................................................................................7-8
Helpful Hints.............................................................................................8
Troubleshooting Guide...........................................................................-P
Repair Parts........................................................................................10-11
INTRODUCTION
We suggest you take a few minutes to read the instructions con
tained in this manual before installing and using your 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 control which
naturally cannot be covered in our warranty.
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RULES FOR SAFE INSTALLATION AND OPERATION
Read the Owners Manual and Rules for Safe Operation and
Installation Instructions carefully. Failure to follow these Rules
and Instructions could cause serious bodily injury, and/or prop
erty damage.
Check your local electrical wiring codes before installation. If
your local codes are not followed, your pump will not work to
its full rated capacitj’. If in doubt, contact your local Power
Company.
Be certain your pump installation meets all local plumbing,
3.
pump and well codes.
While installing the pump, always keep the well covered to pre
vent leaves and foreign matter from falling into the well and con
taminating the water and/or causing possible serious damage to
the mechanical operation of the pump.
5. Always test the wcU water for purity before using. Check with
local health department for testing procedure.
6. Before Installing or servicing your pump, BE CERTAIN pump
power source is disconnected. -
7. Be sure your pump electrical circuit is properly grounded.
8. Complete pump and piping system MUST be protected against
below freezing temperature. Failure to do so could cause severe
damage and voids the Warranty.
9. Make sute the line voltage and frequency of the electrical circuit
supply agree with the motor wiring. If motor is dual voltage
type, BE SURE it is wired correctly for your power supply.
10. The correct fusing and wiring sizing is essential to proper motor
operation. Recommended fusing and wire size data is in the
manual.
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Hittifatlan Of exchuiOQ not apply
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MAJOR COMPONENTS / PIPING
MAJOR COMPONENTS AND WHAT
THEY DO
NOTICE; Use Teflon tape supplied with the pump for making all
threaded connections to the pump.
Impeller and Jet
Impeller turns with motor shaft, causing water to fly out from its
rim by centrifugal force. Impeller rotation creates a vacuum which
pulls in more water. Part of the water is diverted back to the jet
where it passes through the nozzle and venturi. This creates more
vacuum to draw in more water.
In shallow we lls (less than 20 feet deep), the vacuum created at the
pump is enough to pull water to the pump. Therefore, the jet as
sembly is built into the pump.
Air Volume Control
The air volume control (AVC) maintains the cashion of air in
Standard tanks,
MAJOR COMPONENTS / PIPING
Pressure Switch
The pressure switch provides automatic control.
MODEL NO.
390.251483
390.251883
PUMP STARTS AT
40 PSI
40 PSI
PUMP STOPS AT
60 PSI
60 PSI
Tank
The tank serves two functions. It provides a reservoir of water,
some of which can be drawn through the house fixture before the
pump must start. It maintains a cushion of air under pressure.
Two types of tanks are available. Captive Air* and Standard. No air
volume control is needed with Captive Air* Tanks.
PIPING IN THE WELL
A shallow well jet pump can be installed on a dug well, drilled well
or a driven point. SEARS shallow well jet pumps have a built-in
check valve. In a dug or cased well, a foot valve and strainer should
be installed for easy priming. It should be 5 to 10 feet below the
lowest level to which the water will drop while pump is operating
(pumping level) (Figure 1).
The strainer should not be too close to the bottom, or sediment
may clog-it. Before installing foot valve, check to see that it works
freely.
When using a foot valve, a priming tee and plug must be included
(Figure 2).
Be sure the vertical distance (Uft) from the priming level to pump
is not over 20 feet, if the pump is over well. This will be less if
pump is offset from the well. Both figures are for sea level. The
maximum lift of any pump decreases with the elevation above sea
level. This decrease is at the rate of 1 foot per 1000 feet of eleva
tion, For example, the lift is 17 feet and your elevation is 3000 feet
above sea level. You would then be pumping 17 plus 3, or 20 feet.
This is still satisfactory for shallow well pumping.
Horizontal Piping from Well to Pump
On well point installations where the horizontal piping is more
than 25 feet, a check valve should be installed (Figure 3).
When the pump is offset more than 25 feet from the well, hori
zontal piping should be increased in size to reduce friction losses.
Never use offset piping that is smaller than the suction tapping of
the pump.
Horizontal Offset Piping Sizes - Shallow Well Jets
1-1/4”
Up to 25 ft. 25 to 50 ft. 50 to 200 ft.
1-1/2” 2”
Discharge Pipe Sizes
When the pump is some distance from the house or point of water
use, the discharge pipe size should be increased to reduce pressure
losses.
1”
Up to 25 ft. 25 to 100 ft. 100 to 600 ft.
1-1/4"
Plastic Pipe
S'To 10'
Pumping Level
1-1/4” 1-1/2”
_L
EMERGENCY POWER
In some areas and with some installations, an emergency power
supply to guard against power failure is a good idea. If you install
an engine-generator set for emergency backup power for your
pump, supply the generator set manufacturer with the nameplate
data from the pump motor. He wUl then be able to provide a gen
erator of the correct size to power your pump. Also, be sure to add
the load from any other accessories (such as lights) that may be on
the same circuit.
RECOMMENDED FUSING AND WIRING DATA
Motor
Pump Model
Horsepower Volts
390.251483 1/2
390.251883
3/4
115/230
115/230 12,4/6,2 20/15 12Л4
Max. Load
Amperes
10.5/5.2
DUG OR CASED WELL
FIGURE I FIGURE 3
FIGURE 2
Distance in Feet From Motor to Meter
Branch
Delayed Fuse
Rating Amps
15/15
14/14 14/14 10/14 8/14
Oto
50
51 to
100
Wire Size
12/14
101 to
200
10/14
201 to
300
8/14
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