Xylem rule DB412 Instruction Manual Download Page 4

Electrical

Disconnect power before installing or servicing the pump.
All potential sources of ignition located in spaces containing gasoline 
powered machinery or gasoline fuel tank(s), or joint fitting(s), or other 
connection(s), between components of a gasoline system, shall be 
ignition protected in accordance with the requirements of ISO 10133, 
ABYC E-11, AC and DC Electrical Systems On Boats.
The electrical wiring, connections, and installation shall be in accordance 
with the requirements of ISO 10133,  ABYC E-11, AC and DC Electrical 
Systems On Boats.

Wiring Instructions

•  Make all electrical connections in dry locations; connections in humid 

environments should be sealed to prevent corrosion.

•  Protect the circuit with a rated fuse or circuit breaker in the red 

positive (+) lead as close as possible to the power source.

•  Connect the black motor wire to the negative (—) battery terminal.
•  Inadequate voltage at the motor terminals when the pump is running 

(not less than 10% below rated voltage at full load) due to partially 
discharged batteries or insufficient cable size may result in blowing 
fuses, failure to start or poor pump performance.

•  Ensure sterilization of wet end before disassembly.

Plumbing 

Factors that reduce the flow of a bilge pump may include but are not 
limited to the following:

•  The length of discharge piping (longer runs reduce flow)
•  The number or radius of bends
•  Excess amount of debris in water. A strainer or other means of 

preventing debris from entering the pump inlet should be used to 
prolong life and performance. 

•  The roughness of the interior surfaces of piping and fittings (smooth 

bore hose is best)

•  The reduction (hose restriction) in cross-sectional area of discharge 

system components such as check valves and thru-hulls

The discharge may be located below the maximum heeled waterline if the 
discharge line is provided with both of the following:

WARNING: 

If the fuse fails repeatedly do not fit a heavier fuse or bridge the 

fuse terminals with silver paper or metal wire. Failure to observe this instruction 

may result in a fire hazard due to overheating of cables.

Pump

Power

Control 

Switch

Fuse

Black

Red

Model No.

Voltage

Max 

Current

Max 

Fuse Size

Wiring Size*

AWG

mm

2

Max Length

50880-1000

12V

8A

10A

14

2.5

30ft (9m)

     *for longer installations, fit thicker cables

CAUTION: 

Disconnect power from the system before working on the 

unit to avoid personal injury, damage to the surrounding environment and/or 

damage to the unit.

CAUTION: 

Always install proper fuse size to prevent damage to product 

should a short occur. Failure to install proper fuse could increase risk of pump 

malfunction potentially resulting in personal injury and/or fire hazard.

CAUTION: 

Keep all wire connections above the highest water level. Wires 

must be joined with butt connectors and a marine grade sealant to prevent 

wire corrosion.

Summary of Contents for rule DB412

Page 1: ...DRY BILGE PUMP WITH PANEL SWITCH DB412 INSTRUCTION MANUAL...

Page 2: ...ine fuel source as described in ABYC E 11 5 3 3 Exception 1 Boats using diesel fuel as the only fuel source 2 Outboard engines mounted externally or in compartments open to the atmosphere in accordanc...

Page 3: ...ded to absorb vibration Use 3 4 19mm i d spiral reinforced hose with a smooth internal bore or semi rigid pipework systems Connect the hose to inlet and outlet of pump using stainless steel hose clamp...

Page 4: ...charge piping longer runs reduce flow The number or radius of bends Excess amount of debris in water A strainer or other means of preventing debris from entering the pump inlet should be used to prolo...

Page 5: ...s recommended that you remove the check valve and drain any residual water from the plumbing Periodically remove clean and inspect bilge pump check valve and its surroundings for damage or debris that...

Page 6: ...ten until firmly secure Maintenance Check all electrical connections periodically particularly in salt water areas Corrosion can cause loss of performance or non operation in extreme cases The motor s...

Page 7: ...mbly 13 Shower Drain Bilge Pump Chamber 17 Washer Bilge Pump Service Kit 7 Cover 1 8 Diaphragm 1 10 Hex Head Screw 4 12 Screw Recessed Pan Head 1 14 Shower Drain Bilge Pump Joker Valve 2 15 Shower Dra...

Page 8: ...onditions of sale copies of which will be furnished upon request 2020 Xylem All rights reserved Rule is a trademark of Xylem or one of its subsidiaries 950 0548 Rev B 05 2020 USA 100 Cummings Center S...

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