1700-Series Bait Sentry IOM

1700-Series Bait Sentry IOM
Installation and Operation Instructions
SHURflo's 12VDC Magnetic Drive Bait Sentry (MDBS) is available in three distinct flow rates relative to
the capacity of the bait tank or live well. The actual pump flow rate is dependent upon plumbing losses
and "head" (push or rise) from the pump to the top of the tank. It is also important to know the tanks’
true "working capacity". The three sizes are: -500 suitable with tanks of 15 to 30 gallons [50-114 Lt.], 800 with tanks of 20 to 45 gallons [75-170 Lt.], and -1100 for tanks of 35 to 60 gallons [132-227 Lt.]
capacity. Reference Specifications (page: 3) for proper selection.
There are various factors for determining the appropriate tank size and pump which will permit bait fish
(or live well fish) to survive in the hostile environment of the tank. The amount of water in relation to the
number, weight, or "scoop(s)" of bait/fish in the tank is crucial. A general recommendation is 20 gallons
[75 Lt.] capacity to maintain 6 to 11 pounds [3-4.5 Kg] of bait/fish, which is usually considered a scoop.
Tank shape will affect the water currents within the tank. An ideal shape is oval. A deep tank is much
better than a shallow one. Water within the tank should circulate counterclockwise at an extremely
slow rate to keep the bait oriented in one direction. The tank fill tube should be positioned from top to
bottom within the tank. Water must enter at the top of the tank to prevent drain back when the pump
is off. A series of graduated holes or slots that allows slightly more flow at the bottom of the tank is
desirable. Currents at the bottom of the tank should angle upward slightly to insure waste from the
bait/fish is continually flushed from the tank. The tank drain must be four times the input tubing, as it
must be able to pass the full volume entering the tank under pressure. The fresher the water in the
tank, the healthier the bait/fish.
Water temperature is critical. Typically, when the water is 60ºF [15ºC] or less, most bait/fish will stay
healthy and active. As the water temperature approaches 70ºF [21ºC] or above, there is less oxygen
and the bait/fish become lethargic and more subject to being injured. The time that it takes to fill or
change the tank will be referred to as "water turns". If a pump has too high of flow for tank capacity,
water turns will be too often. Also, strong currents may cause the bait/fish to tire swiftly and die. If on
the other hand, the pump flow is too low, there will not be sufficient water turns and not enough fresh
oxygenated water enters the tank to flush out waste. When the water is warm (approaching 70ºF
[21ºC]), water turns as often as 7 minutes are desirable. If the water is cooler (60ºF [15ºC] or less), the
water turns may be up to 10 minutes apart.
With open impeller or centrifugal type pumps (such as the SHURflo MDBS), a flow-adjusting valve is
an asset within the bait system. Restricting the flow actually decreases the amp draw of the motor,
which will not cause damage. Use a gate or ball valve that has an opening I.D. as large as the tubing
I.D. With the boat sitting in the water turn the flow-adjust valve wide open. Start the pump and note
the time it takes to fill the tank. If the tank fills in less than 7 minutes, close off the valve to obtain the
appropriate fill time (7 to 10 min.). If tank head/capacity was used to select the pump, the valve should
only require minor adjustments to obtain the proper water turns. If a pump has too high of a flow for
the tank, the valve will be almost closed in order to obtain the proper water turns. In this condition, if
aerated the pump may lose prime and become airlocked.
Aeration can be a real problem in rough seas or at speed over choppy water. Under such conditions
large amounts of air can continually enter into the thru-hull.
continued on page: 2
911-466 Rev. C
Page: 1 of 3
When the boat is moving forward at high speed, water is forced into the thru-hull
fitting and pump. When a boat is moving at 30 mph [48 kph], the flow jumps to
almost double! Higher speeds equal much higher flows. Flows that result in
“water turns” faster than 7 minutes and are sustained for more than 20 minutes
can/will cause the bait/fish harm or kill them. If your fishing involves long, high
speed runs, it will be necessary to establish two flow adjust valve positions. The
first setting is for stopped or low speed operation per the adjustment procedure
on page 1. The second setting is for sustained high speed operation. With the
tank empty, turn the flow adjust valve approximately ½ open. Turn on the pump
and quickly accelerate to your desired "high speed". Note the time required to fill
the tank. If necessary, drain the tank, reset the valve, and repeat test until a
moving fill time of approximately 7 minutes is reached.
CAUTION: When stopped, or going slow, remember to turn the flow adjust valve
BACK to the stopped position.
When plumbed correctly, the SHURflo MDBS can clear air trapped in the pump
within a few seconds. Actual times will vary depending on system configuration.
MDBS design features will cause trapped air to clear as long as the thruhull/impeller remain flooded.
The pump’s ability to clear air may be hindered by: plumbing that is horizontal or
sagging below horizontal, improper sizing of the pump in relation to the tank
head/capacity, or substantial back pressure due to restrictive plumbing.
The thru-hull should be located approximately 6 in. [15cm] off the center line of
the keel. It should not be located directly in-line with any other obstructions
such as water pick-ups, transducers, rivet heads, or running strakes. Such
items may cause turbulence in the water resulting in a disrupted or aerated
flow when the boat is moving. This simply means that air is pulled from the
water and forced into the tank. This is not desirable and will rapidly kill the bait
if operated under such conditions for a period of time.
1. To prevent cavitation of main drive engine, thru-hulls, transducers ,etc. should
not be located in-line with the water pick up for the engine.
2. All thru-hulls MUST have a sea-cock shut-off valve in case of an emergency.
3. DO NOT use a wrench to tighten pump to the sea-cock valve.
Snug by hand only. Properly seal all pipe threads to prevent leaks.
4. Tubing should be rated for below water-line usage. Tubing I.D. must be smooth
wall. “Bellows” type tubing may cause as much as 50% loss in flow.
5. Always double clamp all tubing connections that are below the water line.
6. Do not cut pump wire leads. Wire connections should be made above possible
bilge water level. Seal wire connections to prevent corrosion and electrolysis.
1. Never operate the engine or electrical equipment if fuel vapors are detected.
Locate the source of the fuel vapor and properly vent.
2. When the vessel is not in use, the main power switch and sea-cock valve(s)
should be OFF/CLOSED. However, if left afloat, the bilge pump(s) should still
have power.
Page: 2 of 3
1 ft [30 cm] 2 ft. [60cm]
3 ft. [1M]
4 FT. [1.2M] 5 ft. [1.5 M] 6 ft. [1.8M]
30 [113]
26 [98]
20 [75]
10 [37]
40 [151]
35 [132]
29 [109]
22 [83]
11 [41]
62 [234]
57 [215]
50 [189]
42 [158]
30 [113]
6 [22]
Flow rates are based on 10 ft. of total tubing from the pump to the tank at 12 VDC.
Power leads; 6 ft. [1.8 M] #18 twisted jacketed cable to minimize R.F.I. (+ BROWN; – BLACK)
Dimensions(approx.): 4 x 8 in. [10x20cm]
Approx. weight: 1.85 lbs [.08kg]
Vibration induced by sea conditions or transportation may cause plumbing or pump hardware to loosen.
Check for system components that may be loose. Many symptoms can be solved by simply tightening
these components. Check the following items along with other particulars of the system:
Pump will not start,
or no water
The pump will not
prime, sputters, or
is air locked .
Check electrical connections; fuse, switch, and ground connection. Check if voltage
is present at the pump. Check for improper fuse rating or wire size.
Sea-cock / thru-hull or valve closed. Pump above water level. Sea-cock valve not
fully open. Tank flow adjust valve closed.
Outlet tubing is sagging below horizontal or there is an air lock trap between the
outlet of the pump and tank. Turn off pump, wait 5 seconds, restart. Check for debris
covering the thru-hull fitting and that tubing is not plugged with debris.
Check for debris in the pump impeller: Turn off sea-cock valve. Remove screws (4)
from the top housing. Carefully remove motor/impeller assembly and o-ring. Clear
debris. Reinstall o-ring and motor/impeller assembly and screws.
If the bait system and pump are subject to freezing weather, serious damage could occur to the
components. It is best to completely drain the pump and all other related components. It may be
necessary to remove the discharge tubing from the pump to prevent water from draining back into the
pump chamber and freezing. If the boat is stored out of the water, the sea-cock valve should be open.
SHURflo warrants its Mag-Drive Bait Sentry pumps to be free of defects in material and workmanship
under normal use for a period of three (3) years from the date of manufacture indicated on the pump
label. Returns are to be shipped prepaid to SHURflo. This warranty is only a representation of the
complete marine products limited warranty outlined by Service Bulletin #1050. Please contact SHURflo
for complete warranty information.
! ISO Certified Facility
a WICOR Company
SHURflo reserves the right to update specifications, prices, or make substitutions.
SHURflo !
SHURflo Ltd.
SHURflo East
12650 Westminster Ave.
Unit 5 Sterling Park
52748 Park Six Court
Santa Ana, CA 92706-2100
Gatwick Road, Crawley
Elkhart, IN 46514-5427
(800) 854-3218 (714) 554-7709
West Sussex, RH10 2QT
((800) 762-8094
FAX (714) 554-4721
United Kingdom
(219) 262-0478
+44 1293 424000
FAX (219) 264-2169
Shipping/UPS: 12650 Westminster Ave.
© 1998 Printed in USA
FAX +44 1293 421880
Garden Grove, CA 92843
911-466 Rev. C
Page: 3 of 3
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