Model 21P* Macerator Pump
Installation, Operation & Repair Manual
THE FOLLOWING ARE CAUTIONARY STATEMENTS THAT MUST BE READ AND
FOLLOWED DURING BOTH INSTALLATION AND OPERATION.
WARNING: RaritanEngineeringCompany, Inc. recommendsthataqualifiedpersonorelectricianinstallthis
product. Equipment damage, injury to personnel or death could result from improper installa-
tion. Raritan Engineering Company, Inc. accepts no responsibility or liability for damage to
equipment, or injury or death to personnel that may result from improper installation or
operation of this product.
WARNING: RISK OF SHOCK OR FIRE - If the pump is operated in an area containing flammable vapors,
the wire leads must be joined by insulated mechanical locking connectors. Loose or inadequate
wire connections can spark, resulting in an explosion resulting in property damage, injury, or
death. Always use recommended fuse/circuit breaker and wire size.
Motors in this product are “Ignition Protected”. They are not however, explosion-proof as
defined in 46CFR 110.15-65(e), Subchapter J-Electrical Engineering.
WARNING: RISK OF FLOODING-Always shut off seacock(s) before leaving the boat unattended.
Whenever possible hose connections should be secured using two stainless steel hose clamps.
Integrity of clamps, hoses and fittings should be checked periodically.
Raritan’s macerator pump is designed to empty marine and RV holding tanks of normal waste. It is
also an excellent choice for emptying fish boxes of scales and residual waste. A flow rate of up to 13
gallons per minute conveniently empties any tank in minutes. The unique dual-cut blade design ensures
waste is ground up thoroughly. The pump is self-priming to a five foot lift when impeller is wet, four
foot lift when impeller is dry, but for optimum performance and life, it should be mounted as close to
the tank as possible. Marine pump out must be in proper discharge zones only. This macerator
will not handle hard objects, rags, or feminine napkins.
1-800-352-5630
Product Specifications
Seamless can motor, 1/8 hp
Thermally protected
Electrical Installation Checklist
√ Separate circuit from power source
√ Proper size momentary switch mounted
near pump
Motor:
Lead wires: 14 GA
Fuse:
See motor label for fuse size
√ Proper wire size to length
Pump Type: Flexible impeller
Duty Cycle: Intermittent duty only
Ports:
√ Proper fuse size and type
√ Insulated wire connectors
WARNING:
Inlet:
Outlet:
1-1/2” hose barb & 1-1/2” NPT Male
1” hose barb
Pump should be operated on a separate circuit.
Pump should be connected to properly sized
momentary switch. This prevents pump from
damage due to dry run condition.
Switch should be near pump. This will allow
operator to hear change in pump sound when tank
is empty.
Impeller:
Blade:
Dimensions: See drawing
Weight: 5 lbs.
Approvals: UL ignition protected, ISO 8846
CSA, CE styles available
Typical Flow: Dependent on fluid viscosity
Chart below based on water
Globe-Blue
316 stainless “Double-cut”
Head
Ft [m]
0 [0]
Flow gpm[lpm]
Max DC Amps
12 V
24V
12V
17
24V
8
NOTE: For proper operation motor must
rotate counterclockwise when viewed from
pump end.
13 [49]
13 [49]
12 Volt System
Min. Wire Size (20 Amps)
Total Wire Length * 3% Drop 10% Drop
feet [m]
1-10 [.3-3]
11-20 [3.3-6]
21-30 [6.4-9.1]
30-60 [9.1-18.2]
Plumbing Connections
GA
#10
#8
#6
#4
GA
#16
#14
#12
#10
Pump should be mounted as near as possible to tank
to minimize dry run. Pump is self-priming to a
five-foot lift when impeller is wet, four foot lift
when impeller is dry. Pump is more efficient if
mounted near the holding tank.
*length from power source to motor
and back to ground.
INLET:
Always install pump with a shut-off
valve between pump and holding tank.
Use 1-1/2” ID [non-collapsible
vacuum rated] hose on inlet [suction]
side. Use stainless steel hose clamps
on all sanitation connections.
Maximum Operating Head = 30 feet
Hose:
Flange:
To mount to 1-1/2” female flange, inlet
barb must be cut off just before threads.
Seal threads and hand tighten.
Warning: Any air leak on inlet side can cause
pump to run dry and can damage
impeller and impeller housing.
Check all inlet side connections, even
those on deck plates. All runs should
be smooth with no kinks or sharp
angles.
OUTLET: Use 1” minimum ID hose on discharge
side of pump. Connect to thru-hull
fitting above highest heeled point
above waterline. Vented loop
installations must vent at least 10”
above highest heeled point above
waterline. Use stainless steel hose
clamps on all sanitation connections.
Item Description
Qty.
3
1
1
1
1
1
1
1
Repair parts
1
2
3
Cover Screw
Cutter Housing
O-Ring
Part # Contains
21P571 Item #8,9
21P570 Item #3, 7-13
17
16
14
15
4
Hex Nut
5
6
7
8
Top Cutter Blade
Bottom Cutter Blade
Top Wear Plate
Gasket
11
13
12
9
Impeller
1
10
11
12
13
14
15
16
17
18
19
Bottom Wear Plate
Impeller Housing
Shaft Seal
Slinger
Motor Assembly
O-Ring
Rear End Shaft Cover
End Cap Screw
Baseplate Assembly
Hex Bolt
1
1
1
1
1
1
1
2
9
7
5
3
18
10
1
2
19
8
6
4
1
2
LIMITED WARRANTY
RaritanEngineeringCompanywarrantstotheoriginalpurchaserthatthisproductisfreeofdefectsinmaterialsorworkmanshipforaperiod
of one year from the product’s date of purchase. Should this product prove defective by reason of improper workmanship and/or materials
within the warranty period, Raritan shall, at its sole option, repair or replace the product.
1. TO OBTAIN WARRANTY SERVICE, Consumer must deliver the product prepaid, together with a detailed description of the problem,
to Raritan at 530 Orange St., Millville, N.J. 08332, or 3101 SW 2nd Ave. Ft. Lauderdale, FL 33315. When requesting warranty service,
purchaser must present a sales slip or other document which establishes proof of purchase. THE RETURN OF THE OWNER
REGISTRATIONCARDISNOTACONDITIONPRECEDENTOFWARRANTYCOVERAGE. However,pleasecompleteandreturn
the owner Registration Card so that Raritan can contact you should a question of safety arise which could affect you.
2. THIS WARRANTY DOES NOT COVER defects caused by modifications, alterations, repairs or service of this product by anyone other
than Raritan; defects in materials or workmanship supplied by others in the process of installation of this product; defects caused by
installation of this product other than in accordance with the manufacturer’s recommended installation instructions or standard industry
procedures; physical abuse to, or misuse of, this product. This warranty also does not cover damages to equipment caused by fire, flood,
external water, excessive corrosion or Act of God.
3. ANYEXPRESSWARRANTYNOTPROVIDEDHEREIN,ANDANYREMEDYFORBREACHOFCONTRACTWHICHBUTFOR
THIS PROVISION MIGHT ARISE BY IMPLICATION OR OPERATION OF LAW, IS HEREBY EXCLUDED AND DISCLAIMED.
ALL IMPLIED WARRANTIES SUCH AS THOSE OF MERCHANTABILITY AND OF FITNESS FOR A PARTICULAR PURPOSE,
IF APPLICABLE, AS WELL AS ANY IMPLIED WARRANTIES WHICH MIGHT ARISE BY IMPLICATION OF LAW, ARE
EXPRESSLY LIMITED TO A TERM OF ONE YEAR. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG A
LIMITED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
4. UNDER NO CIRCUMSTANCES SHALL RARITAN BE LIABLE TO PURCHASER OR ANY OTHER PERSONS FOR ANY
SPECIAL OR CONSEQUENTIAL DAMAGES, WHETHER ARISING OUT OF BREACH OF WARRANTY, BREACH OF
CONTRACT, OR OTHERWISE. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
5. No other person or entity is authorized to make any express warranty, promise or affirmation of fact or to assume any other liability on
behalf of Raritan in connection with its products except as specifically set forth in this warranty.
6. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
530 Orange Street, P.O. Box 1157, Millville, NJ 08332 USA
Telephone: 856-825-4900 FAX: 856-825-4409
Southern Office and Plant:
3101 SW Second Avenue, Fort Lauderdale, FL 33315 USA
Telephone: 954-525-0378 FAX: 954-764-4370
L345 0404kgs
Specifications Subject to Change Without Notice
Printed in U.S.A.
Manufactured by Shurflo - Distributed by Raritan Engineering Company
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