MODEL 31765-0092
& 31765-0094
Dual Sensor Max™ VSD
WATER PRESSURE SYSTEM
AUTOMATIC TWO STAGE WATER SYSTEM
WITH PUMPGARD STRAINERS
IDEAL FOR PLEASURE AND COMMERCIAL BOATS WITH
HIGH DEMAND REQUIREMENTS
FEATURES
• Maintains steady water flow up to 9 GPM (34 lpm)
• True sensor regulated water pressure
• Operates at a nominal 30 psi (2 bar) pressure
• Eliminates need for accumulator tank
• Self-priming – Runs dry without damage
• CSA Listed
•
93/68/EEC, IEC 60335-1, 89/336/EEC, ISO 8846, ISO 10133:2000
• Patent Pending
• Meets following standards:
Motors meet USCG Electrical Regulation 183.410
and ISO 8846 MARINE for IGNITION PROTECTION
on gasoline powered vessels.
PRODUCT SPECIFICATIONS
Motor
Permanent Magnet DC type
Sensor based electronic speed control Double ball bearing armature
Pump
Positive displacment diaphragm type Four chamber design
Built-in Hall-Effect pressure transducer
Weight
15.0 lbs. (6.8 kg)
TO AVOID SERIOUS OR FATAL PERSONAL INJURY OR MAJOR PROPERTY DAMAGE, READ AND
FOLLOW ALL SAFETY INSTRUCTIONS IN MANUAL AND ON PUMP.
WARNING
Warns of hazards that CAN cause serious personal injury, death or
major property damage.
NOTICE
The Jabsco Dual Sensor Max VSD is designed specifically for
water pressure systems in boats and recreational vehicles.
Using state-of-the-art electronic control. Patent pending circuitry reduces power consumption and noise at low flow rates
and eliminates the need for a bulky accumulator tank. Pump
cycling and water hammer are virtually eliminated.
• The Dual Sensor Max VSD should be wired to the power
supply through a switch rated for 25 amps.
Voltage Amp Draw Fuse Rating
VDC
(System) (Each Pump)
Warns of hazards that WILL cause
serious personal injury, death or
major property damage.
Warns of hazards that CAN cause personal injury or property damage.
GENERAL INFORMATION
Model
Number
DANGER
Important: Notice is used to notify people of
installation, operation, or maintenance information which is important
but not hazard-related.
Indicates special instructions which
are very important and must be followed.
THIS MANUAL MUST BE KEPT WITH THE PUMP.
MAINTAIN SAFETY LABELS.
Flow Rate
GPM (lpm)
Regulated
Pressure
Cut-out
Pressure
Inlet
Strainer
31765-0094
24
10A
7A
9GPM (34 lpm)
30 psi (2 bar)
40 psi (2.75 bar)
Yes
31765-0092 12 20A 15A 9GPM (34 lpm) 30 psi (2 bar) 40 psi (2.75 bar) Yes
WARNING
!
WIRING DIAGRAM
Explosion hazard. Do not pump gasoline, solvents,
thinners or other flammable liquids. To do so can
cause an explosion resulting in injury or death.
EMI
Filter Box
Inline
Fuse
INSTALLATION MOUNTING
Dual Sensor Max VSD system is self-priming and may be located
up to 5 feet (1.5m) above the fresh water tank in a dry location. Note: vertical prime can vary depending on the fluid viscosity,
suction tube size, use of a foot valve, and pump configuration.
If mounted inside an enclosure, provide adequate ventilation for
cooling.
Install four rubber grommets in pump bracket mounting holes.
The Dual Sensor Max VSD bracket is designed to mount on a
flat surface with four mounting screws of adequate size. Do not
mount to a vertical surface. Excessive strain caused by vertical
mounting may cause failure of the mounting bracket. Do not
over tighten mounting screws. Rubber grommets act as shock
absorbers. Tighten mounting screws until rubber grommets
are partially compressed. Over-tightening can cause excessive
noise and vibration in the plumbing system.
FLEXIBLE
HOSE
RIGID
PIPE
PLUMBING
Use flexible hose and plastic fittings of correct pressure rating
and compatible with the fluid being pumped. Tubing should be
a minimum of 3/4” (19 mm) inside diameter to provide free flow
and be secured with stainless steel clamps at each fitting. Do
not connect pumps directly to rigid pipe. Rigid pipe will amplify
pump noise and may fatigue and break plastic inlet and outlet
fittings causing pump to leak. Periodically clean PUMPGUARD
strainers. Avoid kinks in flexible plumbing.
TYPICAL PLUMBING SYSTEM
Water
Heater
Hot Water
Line
Check
Valve
Faucet
Shower
Tank
Fill
Faucet
Water
Tank
!
WARNING
Tank
Vent
Dual Sensor
Max VSD
Fire hazard. Wiring must comply with
applicable electrical standards and include
.
a properly sized fuse or circuit breaker.
Improper wiring can cause a fire resulting
in injury or death.
(+)
(–)
Red (+)
Black (–)
On/Off
Switch
DC Battery
NOTICE
When using a power supply or
converter, a battery must be in the
circuit for proper operation.
WIRING
Consult the WIRING DIAGRAM for proper circuit connection.
The Dual Sensor Max VSD should be wired to the power
supply through a switch rated for 25 amps. An inline fuse is
factory installed in each pump to provide over current
protection to each pump. The pump circuit should not include
any other electical loads. Red wire is positive. Black wire is
negative. Turn the system off when not in use for extended
periods or when supply tank is empty.
IMPORTANT VSD electronics require that a battery be
installed in the DC power supply when using an AC to DC
converter or battery charging system. Electrical noise from
the converter or battery charging system can interfere with
proper operation of the VSD circuit unless a battery is present
in the DC power supply as shown in the WIRING DIAGRAM.
IMPORTANT Polarity of electrical connections is very important. Insure that the RED (+) motor lead is connected to a
fused positive DC circuit. The BLACK (-) motor lead must be
connected to the negative DC circuit. In the event the polarity
is reversed on the VSD pump, the fuse found in the ‘EMI Filter
Box’ built into the VSD power wire leads must be replaced.
IMPORTANT This system should be installed by a qualified
electrician or someone familiar with applicable electrical and
safety standards.
Use wire size according to the chart below. Total wire length
refers to the distance from the DC power source to the pump
and back to the power source. This chart provides for a maximum 3% voltage drop.
WIRE SIZE TABLE
Total wire 0-20 ft
20-30 ft
30-40 ft
40-60 ft
length
(0-6 m)
(6-9 m)
(9-12 m)
(12-18 m)
Wire
Size
#10 AWG
(6 mm2)
#8 AWG
(10 mm2)
#6 AWG
(16 mm2)
#4 AWG
(25 mm2)
Motor case will get hot during extended
operation. Prolonged contact with skin
may cause a burn.
PRE-OPERATION CHECKS
The supply tank should be at least half full prior to initial operation. Insure all plumbing connections are secure. Insure flexible
tubing is not kinked. Insure all electrical connections are secure
and in accordance with the WIRING DIAGRAM. Open all hot
and cold water faucets and fixtures. Insure that water heater
circuit is off.
EXPLODED VIEW
1
1
10
5
2
3
4
2
3
4
5
PARTS LIST
Key
Description
31765-0092 (12V)
31765-0094 (24V)
1
1
2
3
4
4
5
Not shown
Not Shown
6
7
8
9
10
Upper Housing Kit w/Sensor Housing (Top Pump) Upper Housing Kit (Bottom Pump)
Check Valve Kit
Lower Housing Kit
Motor w/Sensor (Top Pump) Motor (Bottom Pump)
Port Clips
Pump Head Assembly (Top Pump)
Pump Head Assembly (Bottom Pump)
Manifold Kit
Bracket Kit
Strainer Kit
Port Fitting Kit
Pressure Switch (Bottom Pump)
Service Kit items 2, 3, 5
18910-4028
18910-4025
18911-7030
18915-9002
18919-0129
18919-0136
30648-1000
18914-6038
18914-6325
18753-0718
18753-0719
46400-9500
20381-073
18916-0025
18920-9043
18910-4028
18910-4025
18911-7030
18915-9002
18919-0129
18919-1057
30648-1000
18914-6038
18914-6325
18753-0718
18753-0719
46400-9500
20381-073
18916-0025
18920-9043
*
DIMENSIONAL DRAWING
Inches (Millimeters)
10.81 (275)
8.31 (211)
3.50 (89)
6.06 (154)
8.88
(225)
1.56
(40)
3.88 (98)
OPERATION
Switch the Dual VSD Pump System on and allow pump to
prime. Turn each faucet and fixture off as flow becomes steady
and free of air. Pump should shut off shortly after last faucet
is closed. If pump does not turn off automatically, check for
plumbing leaks and/or continue to bleed air from plumbing system.
4.25 (108)
Pump is now ready for automatic operation. It will start when
faucet(s) open and stop when faucet(s) close. If pump will be
inoperative for an extended length of time, turn pump circuit
off and open a faucet momentarily to relieve system pressure.
emove electrical power from pump
WARNING R
before servicing equipment.
SERVICE AND MAINTENANCE
Use only genuine Jabsco replacement parts. Insure power is
removed from pump before service. Drain supply tank and/
or pump system dry before disconnecting liquid fittings.
Periodically clean PUMPGUARD strainers. Keep spare part
kits on hand. Adhere to a preventive maintenance schedule
and replace ‘ware’ parts before the end of their service life.
DISSASSEMBLY
Refer to exploded view.
PRESSURE SENSOR OR PRESSURE SWITCH Remove
cover in item 1. On VSD models, remove clip and unplug pressure sensor. On demand models, disconnect wire leads from
terminals. Remove two mounting screws to release sensor/
switch housing and diaphragm in figure 1.
UPPER HOUSING Remove four pumphead screws to release
upper housing, item 1. Inspect backflow valve in sensor port
for debris. Clean if necessary. Install new sealing ferrules in
upper housing before re-assembly.
CHECK VALVE ASSEMBLY Remove o-ring and check valve
assembly item 2 from pumphead. Valves should be clean and
resilient. Replace if necessary. Always replace o-ring seal.
LOWER HOUSING ASSEMBLY Remove set screw item 4 in
cam bearing assembly from motor shaft using an 1/8” Allen
wrench. To access set screw, remove rubber plug from access
hole in lower housing and rotate the lower housing until the
access hole and set screw are in alignment. Always replace
complete lower housing assembly including diaphragm, pistons, and cam bearing assembly.
RE-ASSEMBLY Re-assemble in reverse order. Rotate each
screw counter clockwise and then clockwise during assembly
to insure that self-tapping screws engage into original threads.
Note: cutting new threads will diminish the strength of the
thread engagement. Insure the set screw in item 3 is aligned
with indentation on motor shaft. Tighten set screw to 35 in-lbs
of torque. Tighten four piston screws to 18 in-lbs of torque.
Tighten four pumphead screws to 30 in-lbs of torque. Sensor/
switch screws should be hand tight. Do not over tighten.
TROUBLESHOOTING CHART
PROBLEM/CAUSESOLUTION
FAILURE TO PRIME OR PUMP
•Debris in check valve assembly
•Air leak in suction line
•Restricted suction line
•Supply tank is empty
•Ruptured diaphragm
Clean check valve assembly
Tighten all fittings and clamps
Clean strainer or remove kink in suction tube
Fill supply tank
Replace lower housing assembly
MOTOR FAILS TO RUN
•Pump circuit has no power
•Loose or corroded wire connection
•Blown fuse or open circuit breaker
•Open thermal protector in motor
•Defective motor, drive, or sensor
Check main switch, wire, fuse or breaker
Fix or replace wire connections
Determine cause, reset breaker or replace fuse
Turn power switch off, allow motor to cool
Replace defective component
PUMP FAILS TO TURN OFF
•Supply tank is empty
•Debris in check valve assembly
•No battery in circuit
•Leaking discharge line
•Leaking diaphragm or pumphead
Fill supply tank
Clean or replace check valve assembly
Install battery, replace VSD motor
Tighten or replace leaking fitting or pipe
Replace lower housing assembly
LOW FLOW OR PRESSURE
•Blocked inlet strainer •Blocked water filter
•Undersized plumbing or very long runs
•Defective motor, drive, or sensor
Clean strainer
Replace filter element
Increase plumbing to 3/4” inside diameter
Replace defective component
THE PRODUCTS DESCRIBED HEREIN ARE SUBJECT TO THE JABSCO ONE YEAR LIMITED WARRANTY, WHICH
IS AVAILABLE FOR YOUR INSPECTION UPON REQUEST.
www.xylemflowcontrol.com
Jabsco, 1 Kondelin Road, Cape Ann Industrial Park, Gloucester, MA 01930
Tel: +1 978 281 0440 Fax: +1 978 283 2619
USA
Jabsco, Bingley Road, Hoddesdon, Hertfordshire, EN11 0BU
Tel: +44 (0) 1992 450 145 Fax: +44 (0) 1992 467 132
UK
NHK Jabsco Co Ltd, 3-21-10, Shin - Yokohama Kohoku-ku, Yokohama 222
Tel: +81 (0) 45 475 8906 Fax: +81 (0) 45 475 8908
JAPAN
Jabsco GmbH, Oststraße 28, 22844 Norderstedt
Tel: +49 (0) 40 53 53 73 0 Fax: +49 (0) 49 53 53 73 11
GERMANY
Jabsco Italia, s.r.l., Via Tommaseo, 6, 20059 Vimercate, Milano
Tel: +39 039 685 2323 Fax: +39 039 666 307
ITALY
Jabsco is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem, Inc. 43000-0869 Rev C 6/12
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