Pentair DELTA ENVIRONMENTAL D1P20-21 Manual

NOTE! To the installer: Please make sure you provide this manual to the owner of the equipment or to the responsible
party who maintains the system.
MODEL D1P20-21
SUBMERSIBLE SEMI-POSITIVE
DISPLACEMENT GRINDER PUMP
SAFETY INSTRUCTIONS,
INSTALLATION AND SERVICE MANUAL
Part # 23833A593 | © 2017 Pentair plc | 02/28/17

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NOTE: READ THESE INSTRUCTIONS
CAREFULLY BEFORE ATTEMPTING TO
INSTALL PUMP.
GENERAL INFORMATION
Thank you for purchasing your Delta Environmental pump. To help
ensure years of trouble-free operation, please read the following
manual carefully.
Before Operation: Read the following instructions carefully.
Reasonable care and safe methods should be practiced. Check
local codes and requirements before installation.
Attention: This manual contains important information for the safe
use of this product. Read this manual completely before using this
product and refer to it often for continued safe product use. DO
NOT THROW AWAY OR LOSE THIS MANUAL. Keep it in a safe place
so that you may refer to it often.
Unpacking Pump: Remove pump from carton. When unpacking
unit, check for concealed damage. Claims for damage must be
made at the receiving end through the delivery carrier. Damage
cannot be processed from the factory.
n WARNING! BEFORE HANDLING THESE PUMPS AND CONTROLS,
ALWAYS DISCONNECT THE POWER FIRST. DO NOT SMOKE OR
USE SPARKABLE ELECTRICAL DEVICES OR FLAMES IN A SEPTIC
(GASEOUS) OR POSSIBLE SEPTIC SUMP.
Always disconnect the pump and controls from its power source
before handling or making any adjustments.
n WARNING! RISK OF ELECTRICAL SHOCK – THIS PUMP HAS NOT
BEEN INVESTIGATED FOR USE IN SWIMMING POOL AREAS.
n WARNING! RISK OF ELECTRICAL SHOCK – THIS PUMP IS
SUPPLIED WITH A GROUNDING CONDUCTOR AND GROUNDING-TYPE
ATTACHMENT PLUG. TO REDUCE RISK OF ELECTRICAL SHOCK, BE
CERTAIN THAT IT IS CONNECTED ONLY TO A PROPERLY GROUNDED,
GROUNDING-TYPE RECEPTACLE.
(1) Connect only to a properly grounded, grounding-type
receptacle or control panel.
(2) Septic tank to be vented in accordance with local plumbing
codes.
(3) Do not smoke or use sparkable electrical devices or flame in
a septic (gaseous) or possible septic sump.
(4) A septic sump condition may exist and if entry into sump is
necessary, then (1) provide proper safety precautions per
OSHA requirements and (2) do not enter sump until these
precautions are strictly adhered to.
(5) Do not install pump in locations classified as hazardous per
NEC, ANSI/NFPA 70 - 1999.
Failure to heed above cautions could result in injury or death.
PUMP CAUTIONS AND WARNINGS
DANGER: Risk of Electrical Shock or Electrocution. May result in
serious injury or death or fire hazard. Installer must disconnect all
electrical sources prior to installation, handling or servicing. Only
qualified personnel may install this system. NFPA 70: National
Electric Code® (NEC) or local codes must be followed. System
must be properly grounded according to NEC. Do not lift pump by
power cord.
DANGER: Biohazard Risk. Once wastewater source has been
connected to system, biohazard risk exists. Installer(s) and/or
service personnel must use proper personal protective equipment
and follow handling procedures per OSHA 29 CFR 1910.1030
when handling equipment after wastewater source has been
connected to system.
DANGER: Risk of Asphyxiation. Installer(s) and/or service
personnel must use proper personal protective equipment and
follow OSHA 29 CFR 1910.146 or OSHA 29 CFR 1926. Pump
may be installed in a location classified as a confined space.
DANGER: Risk of Fire or Explosion. Do not smoke or use open
flames in or around this system. MGPD200 systems are not
intended for use in hazardous locations per NFPA 70: National
Electric Code. Do not pump flammable liquids.
DANGER: Cutting Risk. Risk of serious cutting or amputation
exists. Disconnect all power sources prior to servicing pump or
grinding mechanism. Pump may start without warning. Grinding
mechanism is extremely sharp. Use caution when handling
grinder mechanism.
DO NOT modify the cord strain relief. When wiring to a system
control, connect the pump ground lead to the system ground.
DO NOT run the pump dry. Dry running can overheat the pump
(causing burns to anyone handling it) and will void the warranty.
The pump normally runs hot. To avoid burns, allow it to cool for 30
minutes after shutdown before handling it.
Submersible grinder pumps are not approved for use in swimming
pools, recreational water installations, decorative fountains or
any installation where human contact with the pumped fluid is
common. This specialized pump is designed to incorporate a
grinding mechanism to remove wastewater particulate and pump
the resulting slurry from a residential structure to a collection
system.
Examine all lifting devices, rope or chain for damage before and
after each lift.
DO NOT exceed manufacturers recommendation for maximum
performance, as this could cause the motor to overheat.
Secure the pump in its operating position so it cannot tip over, fall
or slide.
DO NOT pump without safety devices in place.
Basin must be vented in accordance with the local plumbing
codes.
CALIFORNIA PROPOSITION 65 WARNING:
This product and related accessories contain
chemicals known to the State of California to cause cancer,
birth defects or other reproductive harm.
PUMP INSTALLATION
Pump Description: The Delta Environmental pump covered by this
instruction manual is a submersible grinder pump.
The cutter blades are on the suction side of the semipositive
displacement pump impeller and discharge directly into the inlet
of the impeller. The integral stainless steel pump motor shaft is
sealed by a single mechanical seal.
Two ball bearings are used to handle the loads in this design.
The upper bearing takes radial loads, while the larger lower
bearing handles both thrust and radial loads. Both bearings are
permanently lubricated by the dielectric oil in the motor housing.

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The motor is fixed within the motor housing and is completely
submerged in the dielectric oil for maximum heat transfer. The
motor housing and seal chamber are completely sealed with
O-rings located at mating part faces. The power cord entry system
is designed to give reliable sealing.
The first seal is made by compression of a rubber gasket by the
cord grip, thereby expanding to fill the cord entry of the motor
housing. The cord grip forms a second seal around the molded
cord end and provides strain relief.
Application: This pump is designed for either residential or
industrial sewage discharge applications with a pH ranging from 5
to 9, specific gravities from 0.9 to 1.1, viscosities ranging from 28
to 35 S.S.U. and temperatures up to 140°F.
Receiving Pump: Inspect pump on arrival for possible concealed
damage in shipping. Any damage should be reported immediately
to delivering carrier. Claims for damage must originate at the
receiving end. Claims for shipping damage cannot be processed
at the factory.
Codes: All local wiring codes must be observed. Consult the local
inspector before installation to avoid costly delays that can occur
due to rejection after job is finished.
Pump Not Operating Or in Storage: Pumps with carbon ceramic
seals must be manually rotated (6 revolutions) after setting non-
operational for 3 months or longer and prior to electrical start-up.
Installing Pump in Sump: Before installing pump in sump, lay it
on its side and rotate grinder shaft. Stator boot and rotor may be
slightly stuck due to factory test water so it must be broken loose
by rotating shaft with a screwdriver at grinder end. The common
shaft should turn with a slight resistance. Slight lubrication by
means of a small amount of lubricating oil down the cavity inlet of
the stator boot and rotating shaft to prelube stator boot and rotor
before start is recommended. Do not connect the power until after
this test. Clean all trash and sticks from sump and connect pump
to piping. A check valve must be installed on each pump.
Location: If pump is installed in an existing basin or concrete
sump, the piping can either be connected permanently or rails
and brackets can be furnished for mounting to walls of basin. In
either case, be sure that the Delta Environmental solids handling
check valve is used and that the pump is submerged in a
vertical position. The complete factory built packaged system is
recommended for the most satisfactory installation and generally
for the lowest cost where expensive installation labor is involved.
Making Electrical Connections: All electrical wiring must be in
accordance with local code, and only qualified electricians should
make the installation. Complete wiring diagrams are included
for use in making the installation. All wires should be checked
for shorts to ground with an ohmmeter or megger after the
connections are made. This is important, as one grounded wire
can cause considerable trouble.
PUMP OPERATIONS
To reduce the risk of electrical shock, install only on a GFCI
protected circuit. See pump nameplate for electrical ratings.
To start the pump, perform the following steps in order:
1. When grinder pump is single phase, no rotation check
is necessary. Correct rotation is counter-clockwise.
2. Run water into sump until motor is covered.
3. Open gate valve in discharge line.
4. Turn pump on. If pump runs and sump liquid does not pump
down, stop pump and close discharge gate valve. Lift pump
until sealing flange is open to vent off trapped air. Lower
pump, open discharge valve, and start the pump again.
n CAUTION! POSITIVE DISPLACEMENT PUMP IS DESIGNED TO
OPERATE AT MINIMUM 5 GPM CAPACITY. RUNNING PUMP AT
SHUT-OFF CONDITION OR WITH GATE VALVE CLOSED CAN RESULT
IN DAMAGE TO THE PUMPING STATOR BOOT AND ROTOR.
5. Level control should be set so that pump turns off when level
is about 2 inches above inlet of pump suction and turns on
when level is about 2 inches above motor.
6. If problems occur, check power source.
Make sure a separate supply line is available.
Verify voltage supply.
7. Check resistance of windings. If not within guidelines, return
pump to authorized factory service center.
As the motors are oil filled, no lubrication or other maintenance
is required. Pump should be checked every quarter for corrosion
and wear.
PUMP MAINTENANCE
n CAUTION: NEVER WORK ON PUMP WITH POWER ON. MAKE
SURE THAT THE GROUND WIRE IS SECURELY CONNECTED AND
THAT THE UNIT IS PROPERLY GROUNDED IN ACCORDANCE WITH
LOCAL CODES.
n CAUTION: SEVERE INJURY MAY RESULT FROM ACCIDENTAL
CONTACT WITH MOVING CUTTER. KEEP CLOTHING, HANDS AND
FEET AWAY FROM CUTTER ANY TIME POWER IS CONNECTED TO
THE PUMP.
Replacing Cutter Parts: If necessary to replace grinder parts
because of wear or to inspect for clogging:
(1) Close gate valve at pump discharge.
(2) Turn off circuit breaker.
n CAUTION: NEVER WORK ON PUMP WITH POWER ON. BE SURE
GROUND WIRE FROM PUMP IS CONNECTED TO A GOOD GROUND
SUCH AS A WATER PIPE.
(3) Remove pump from sump.
(4) Unscrew screws (5) and remove stationary cutter ring
assembly (4). Radial cutter (3) can be screwed off the
common shaft by lightly tapping cutter and unscrewing
counterclockwise while holding end of common shaft with a
screwdriver in slot at cutter end of shaft.
(5) Radial cutter (3) and stationary cutter (4) can now be
inspected for wear and replaced if necessary.
Stator Boot and Rotor Inspection and/or Replacement:
If necessary to inspect or replace the stator boot and rotor, the
following procedure should be followed.
(1) Unscrew socket head screws (12) and remove volute case
(1). NOTE: Turning common shaft clockwise while removing
volute case can ease removal.
(2) Radial cutter (3) and stationary cutter (4) can be inspected
for wear and replaced if necessary.
(3) Stator boot and rotor are now exposed to check for any
obstructions in or wear of stator boot.

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(4) If necessary to replace stator boot (21), remove screws (9)
and retainer ring (8) from volute (1). Stator boot (21) can now
be lifted out from the volute recess. To replace pump rotor
(22), use a suitable size center punch and remove lower roll
pin (6) from common shaft. Pump rotor (22) can now slide
off common shaft.
(5) Clean all parts thoroughly before proceeding with reassembly.
Slide new rotor (22) on common shaft and carefully replace
lower roll pin (6). Place stator boot (21) back in volute recess,
replace retainer ring (8) and tighten screws (9). Place volute
(1) carefully back over rotor (22) and reattach to seal/bearing
housing (2) with socket head screws (12).
(6) Replace radial cutter (3) on common shaft. Lightly tap radial
cutter (3) clockwise to ensure full engagement onto common
shaft.
(7) Replace stationary cutter assembly (4) and screw down with
screws (5). Carefully rotate shaft by using screwdriver in slot
on shaft, to ensure free rotation of pump.
(8) Plug pump into power source and operate for a few seconds
only (refer to caution note below) to ensure parts are not
rubbing under electrical operation.
(9) Replace stationary cutter assembly (4), and screw down with
screws (5).
(10) Plug pump into power and operate for a few seconds only to
ensure parts are not rubbing.
n CAUTION: DO NOT RUN DRY, OTHERWISE DAMAGE TO STATOR
BOOT CAN OCCUR.
Replacing Seal:
(1) Drain the oil from the pump by removing the fill plug (10)
located on the side of the motor housing (18).
(2) Remove the volute and cutters per the instructions
listed under “Stator Boot and Rotor Inspection and/or
Replacement” and “Replacing Cutter Parts” sections of this
manual.
(3) Remove the pump rotor per instructions listed under
“Replacing Grinder Parts” section in this manual.
(4) Remove the seal (17) rotating elements by sliding the spring
bellows off the common shaft. Then, using two screwdrivers,
slide the carbon seal assembly off by prying on the retaining
ring.
(5) Using a screwdriver, break the old stationary portion of the
seal (17) to allow for removal.
(6) Take the stationary portion of the new seal (17) and lube
the rubber material with good quality dielectric oil. Press
the stationary portion of the new seal into the seal/bearing
housing (2).
n CAUTION: DO NOT REUSE OLD SEAL PARTS. REPLACE ALL
PARTS WITH NEW. MIXING OLD AND NEW PARTS COULD CAUSE
IMMEDIATE SEAL FAILURE.
(7) Using a good quality dielectric oil, lube the rubber material on
the carbon seal assembly (17) and press it on the common
shaft.
(8) Using a pressure gauge with a fill stem, pressurize the motor
housing no more than 7 psig with dried air and check for
leaks. If after several minutes the gauge reads the same, the
seal is good and you can continue with assembly.
NOTE: It is normal to observe some air bubbles in the seal area
initially as the seal seats. If bubbles do not stop within a few
seconds, the seal is either not properly installed or is damaged.
(9) Reassemble the pump rotor, cutter and volute as outlined in
the “Replacing Cutter Parts” section of this manual.
(10) Refill motor housing with a good quality dielectric oil. Fill the
motor housing so that the tops of the motor windings have
been covered, but leave an air gap to allow for expansion of
the oil.
NOTE: When applying power, be sure the pump is restrained from
turning by holding the pump at the motor housing or by clamping it
in a holding fixture.
n WARNING! SEVERE INJURY MAY RESULT FROM ACCIDENTAL
CONTACT WITH MOVING CUTTER. KEEP CLOTHING, HANDS AND
FEET AWAY FROM CUTTER ANY TIME POWER IS CONNECTED TO
THE PUMP.
TROUBLESHOOTING
(1) No liquid delivered.
(a) Pump air bound.
(b) Discharge head too high.
(c) Pump or piping plugged.
(2) Insufficient liquid delivered.
(a) Discharge head too high.
(b) Cutter partially plugged or damaged.
(c) Stator boot or rotor damaged or worn.
(3) Insufficient discharge pressure.
(a) Air or gases in liquid.
(b) Stator boot or rotor damaged or worn.
(4) Pump overloads motor.
(a) Specific gravity or viscosity of liquid too high.
(b) Speed too high.
(c) Pump clogged.
(d) Defective bearings.
(5) Pump is noisy.
(a) Defective bearings.
(b) No diametral clearance between radial cutter and cutter
ring.
If the cause of the trouble cannot be determined and corrected as
outlined above, contact your nearest factory representative.

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Total Head in Feet
Consult Delta Environmental sales
representative for intermittent use.
D1P20-21 PERFORMANCE CURVE

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TYPICAL SECTION DRAWING FOR D1P20-21

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PARTS LIST FOR D1P20-21
Ref
No.
Description No.
Req’d.
Part
Numbers
1 Case – Volute 1 14624-000-2
2 Housing – Seal/Bearing 1 14569-001-2
3 Cutter – Radial 1 21582B000K
4 Cutter – Stationary 1 21584B000K
5 Screw – Cap 3 19099A012
6 Pin – Roll, Lower 1 0018-003-1
7 O-Ring 1 00834-023-1
8 Ring – Retainer 1 14627-000-1
9 Screw – Ring Retainer 3 00829-007-1
10 Pipe Plug 1 14981-001-1
11 Screw – Cap 4 19100A012
12 Screw – Socket 4 00178-006-1
13 O-Ring 1 05014A181
14 Screw – Drive 2 04580-001-1
15 Seal – Shaft 2 14573-000-1
16 Nameplate, 230V 1 27429A001
17 Housing – Motor 1 25327D000
18 Screw – Shaft, Motor 1 14885-000-1
19 Washer – Shaft Impeller 1 05570-005-1
20 Washer – SST 1/32 Thick 1 05030A234
21 Gasket – Rubber 1 05014A193
22 Washer – SST 3/32 Thick 1 05030A235
23 Nut – Cord 1 25341A002
24 Stator – Pump 1 14761-000-1
25 Rotor – Helix 1 14762-101-1
26 Cord – Power 1 25338B001
27 Motor 1 14570-100-1
Use the Delta Environmental standard wastewater warranty for 2 HP grinders.
Product improvements are made from time to time. The latest part design will be furnished as long as it is interchangeable with the old
part. When ordering replacement parts, always furnish the following information: (1) pump serial number, (2) pump model and size,
(3) part description, (4) part number, (5) impeller diameter (if ordering impeller), (6) quantity required, and (7) shipping instructions.
Model Volts Phase Start Winding Run Winding
D1P20-21 230 1 3.15 3.05
WINDING RESISTANCE CHART

STANDARD LIMITED WARRANTY
Delta Environmental warrants its products against defects in material and workmanship for a period of 24 months
from the date of shipment from Delta Environmental or 27 months from the manufacturing date, whichever occurs
first – provided that such products are used in compliance with the requirements of the Delta Environmental catalog
and technical manuals for use in pumping raw sewage, municipal wastewater or similar, abrasive free
non-corrosive liquids.
During the warranty period and subject to the conditions set forth, Delta Environmental, at its discretion, will repair
or replace to the original user, the parts which prove defective in materials and workmanship. Delta Environmental
reserves the right to change or improve its products or any portions thereof without being obligated to provide such
a change or improvement for prior sold and/or shipped units.
Start-up reports and electrical schematics may be required to support warranty claims. Warranty is effective only if
Delta Environmental authorized control panels are used. All seal fail and heat sensing devices must be hooked up,
functional and monitored or this warranty will be void. Delta Environmental will only cover the lower seal and labor
thereof for all dual seal pumps. Under no circumstance will Delta Environmental be responsible for the cost of field
labor, travel expenses, rented equipment, removal/reinstallation costs or freight expenses to and from the factory
or an authorized Delta Environmental service facility.
This limited warranty will not apply: (a) to defects or malfunctions resulting from failure to properly install, operate
or maintain the unit in accordance with the printed instructions provided; (b) to failures resulting from abuse,
accident or negligence; (c) to normal maintenance services and parts used in connection with such service; (d) to
units which are not installed in accordance with applicable local codes, ordinances and good trade practices; (e) if
the unit is moved from its original installation location; (f) if unit is used for purposes other than for what it is
designed and manufactured; (g) to any unit which has been repaired or altered by anyone other than Delta
Environmental or an authorized Delta Environmental service provider; (h) to any unit which has been repaired using
non factory specified/OEM parts.
Warranty Exclusions: DELTA ENVIRONMENTAL MAKES NO EXPRESS OR IMPLIED WARRANTIES WHICH
EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF. DELTA ENVIRONMENTAL SPECIFICALLY
DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR
PURPOSE.
Liability Limitation: IN NO EVENT SHALL DELTA ENVIRONMENTAL BE LIABLE OR RESPONSIBLE FOR
CONSEQUENTIAL, INCIDENTAL OR SPECIAL DAMAGES RESULTING FROM OR RELATED IN ANY MANNER
TO ANY DELTA ENVIRONMENTAL PRODUCT OR PARTS THEREOF. PERSONAL INJURY AND/OR PROPERTY
DAMAGE MAY RESULT FROM IMPROPER INSTALLATION. DELTA ENVIRONMENTAL DISCLAIMS ALL
LIABILITY, INCLUDING LIABILITY UNDER THIS WARRANTY, FOR IMPROPER INSTALLATION. DELTA
ENVIRONMENTAL RECOMMENDS INSTALLATION BY PROFESSIONALS.
Some states do not permit some or all of the above warranty limitations or the exclusion or limitation of incidental
or consequential damages and therefore such limitations may not apply to you. No warranties or representations at
any time made by any representatives of Delta Environmental shall vary or expand the provision hereof.
Warranty Rev 02/09
Delta Environmental
8263 Florida Blvd.
Denham Springs, LA 70726
1-800-219-9183