EMP WP29 User manual

Rev
Rev By
Date
Description of Change
Approved By
B
ME
7/14/20
Revisions
ECN5969
C
ME
5/12/21
Revisions
ECN7280
9970002320 Rev C – 05/12/2021 © 2017 EMP, Inc. 1
Quick Start Guide
WP29/WP32 Electric Water Pump
This manual is effective for consumer installations of
EMP WP29 and WP32 water pumps. OEM Installers
must contact EMP for production requirements.

Product Overview
The information contained in this manual is updated periodically. While great care is taken in compiling the information contained in this manual, Engineered
Machined Products, Inc. cannot assume liability for losses of any nature arising from any errors and/or omissions.
The information and specifications contained throughout this manual are up to date at the time of publication. Engineered Machined Products, Inc. reserves
the right to change the content of this manual at any time without notice.
© 2017 EMP, Inc. 2
Engineered Machined Products, Inc.
2701 North 30th Street
Escanaba, MI, USA 49829
Phone: [phone]
www.emp-corp.com
[e-mail]
Product Overview
The WP29 and WP32 are electrically powered fluid pumps available in 12 volt DC and 24 volt DC configurations.
The pump is standard with carbon steel shafts. Proper installation of the pump will help ensure the performance
and reliability of the electric pump while reducing the risk of damage to other components in the system.

Table of Contents
© 2017 EMP, Inc. 3
Table of Contents
Product Overview ..............................................................................................................................................2
Introduction........................................................................................................................................................4
Purpose .........................................................................................................................................................4
Service Technician Responsibilities ...............................................................................................................4
Liability Disclaimer .........................................................................................................................................4
Additional Information ....................................................................................................................................4
Technical Help ...............................................................................................................................................4
About This Document ........................................................................................................................................4
Warnings, Cautions and Notes.......................................................................................................................4
Definition of Terms.........................................................................................................................................4
Product Safety Warnings ...................................................................................................................................5
Specifications ....................................................................................................................................................6
Operating Limits.............................................................................................................................................6
Dimension and Bolt Spacing ..........................................................................................................................6
Identification ......................................................................................................................................................7
EMP Water Pump Model Codes.....................................................................................................................8
Installation .........................................................................................................................................................9
Environment...................................................................................................................................................9
Orientation .....................................................................................................................................................9
Incorrect Pump Orientation and Reasons ................................................................................................. 11
Plumbing......................................................................................................................................................12
Hose Clamps............................................................................................................................................12
System Fill Procedure .................................................................................................................................. 13
Approved Fluids........................................................................................................................................13
Fill Procedure ...........................................................................................................................................13
Wiring...........................................................................................................................................................14
Recommended Wiring Practices...............................................................................................................14
Connector Information ..............................................................................................................................15
Mating Connectors ...................................................................................................................................15
On/Off Single Speed Control........................................................................................................................ 16
Example On/Off Application Schematic .................................................................................................... 16
Accessories available for purchase...........................................................................................................16
Operation..................................................................................................................................................16
Routine Maintenance.......................................................................................................................................17
Physical Inspection ......................................................................................................................................17
EMPower Connect™ Service Tool .................................................................................................................. 17
Troubleshooting...............................................................................................................................................18

Introduction
© 2017 EMP, Inc. 4
Introduction
Purpose
The purpose of this quick start guide is to present information related to the pump dimensions, electrical
specifications, coolant guidelines, recommended plumbing, mounting orientation, and routine maintenance.
NOTE: For production applications of this product, the full installation specifications must be met. Contact
EMP to request documentation.
Service Technician Responsibilities
Ensure that all safety messages and information messages are read and understood before installation,
maintenance, or repairs are performed. It is important to use caution when service work is performed. Knowledge
of impacted systems and their operation are important before the removal or disassembly of any component.
Liability Disclaimer
EMP cannot anticipate every possible circumstance that might involve a potential hazard. The safety messages
in this document, in related manuals, and on the product are therefore not all inclusive. If a tool, procedure, work
method, or operating technique that is not specifically recommended by EMP is used, you must satisfy yourself
that it is safe for you and for others. You should ensure that the product will not be damaged or be made unsafe
by the operation, maintenance, or repair procedures that you choose.
Additional Information
Access https://www.emp-corp.com/support/ for service software, service bulletins, service manuals, service
drawings, and other documents related to your installed EMP systems and components. First time users may
create a free customer login at http://www.emp-corp.com/account/register/.
Technical Help
Contact EMP Customer Service for technical help at [phone] or [e-mail].
About This Document
Warnings, Cautions and Notes
Two headings are used in this document to stress your safety and safe operation of the system. They are styled
with a graphic bullet and bold, uppercase text: WARNING and CAUTION. Warnings highlight risks to
personnel — hazards, unsafe conditions and practices that can result in personal injury or death. Cautions
indicate conditions or practices that can cause damage to components, systems, or other equipment.
A third heading, styled as NOTE, calls attention to additional information about components and procedures
discussed in the document.
Definition of Terms
CAN .............. Controller area network.
EMPower Connect™ service tool..EMP service tool for diagnostics via PC.
Ignition ......... An enable signal sent to the controller to turn on. This is separate from the power and ground
and should be tied to a switched source and not tied to the pump power.
rpm ............... Revolutions per minute.
!
!

Product Safety Warnings
© 2017 EMP, Inc. 5
Product Safety Warnings
WARNING: EMP cannot anticipate every possible circumstance that might involve a potential hazard.
The safety messages in this document, in related manuals, and on the product are therefore not all inclusive.
If a tool, procedure, work method, or operating technique that is not specifically recommended by EMP is
used, you must satisfy yourself that it is safe for you and for others. You should ensure that the product will
not be damaged or be made unsafe by the operation, maintenance, or repair procedures that you choose.
WARNING: Ensure that all safety messages and information messages are read and understood before
installation, maintenance, or repairs are performed. It is important to use caution when service work is
performed. Knowledge of impacted systems and their operation are important before the removal or
disassembly of any component.
WARNING: Make sure the equipment cannot move before doing any work or diagnostic procedures on
the EMP component, system, or vehicle.
WARNING: When working near electric components, ensure they cannot activate unexpectedly.
Remove power or utilize lock out switches.
WARNING: Use extreme caution when working on systems under pressure (i.e. coolant, hydraulic
fluids, air, fire suppression, etc.).
WARNING: Make sure the work area is ventilated and well lit.
WARNING: Make sure charged fire extinguishers are in the work area.
WARNING: Reinstall all safety guards, shields and covers.
WARNING: Make sure all tools, parts and service equipment are removed from the work area.
WARNING: Ensure that all system power and ground connection points are torqued to EMP and/or
OEM specifications to prevent system damage. Failure to follow specified torque requirements can result in
loose connections which can damage electronic components and will void EMP warranty.
!
!
!
!
!
!
!
!
!
!

Specifications
© 2017 EMP, Inc. 6
Specifications
Model 12V 24V
Performance
Operating Temperature Maximum (fluid) 203 °F (95 °C) 203 °F (95 °C)
Operating Temperature Minimum (fluid) -40 °F (-40 °C) -40 °F (-40 °C)
Motor Speed Minimum 750 rpm 1000 rpm
Motor Speed Maximum 4600 rpm 4600 rpm
Mechanical
Component Construction Cast Aluminum Cast Aluminum
Component Weight 6.7 lbs (3.03 kg) 6.7 lbs (3.03 kg)
Electrical
Input Voltage 9–16 V DC (14 V nominal) 18–32 V DC (28 V nominal)
Operating Current Draw Maximum 25 A 15 A
Thermal Protection Auto self-protect shutdown Auto self-protect shutdown
Operating Limits
Temperature Limitations
Maximum Fluid and Ambient Operating Temp
203 °F (95 °C)*
Minimum Fluid and Ambient Operating Temp
-40 °F (-40 °C)
Maximum Ambient Storage Temp
257 °F (125 °C)
Minimum Ambient Storage Temp
-40 °F (-40 °C)
* If the intended application fluid temperature exceeds 95 °C, the pump
may not perform as expected.
Dimensions and Hole Locations/Bolt Spacing

Identification
© 2017 EMP, Inc. 7
Identification
The product identification label is attached to the controller housing next to the electrical interface of the pump.
The product label contains model information and serial number. The serial number can be used to trace the
component hardware configuration, software calibration, the date of manufacture, and manufacturing data.
Product labels may not match the example but will have the part number and serial number for the pump.

Identification
© 2017 EMP, Inc. 8
EMP Water Pump Model Codes
Example: WP32-24V-CH-A
WP
32
-
24V
-
C
H
-
A
[OEM]
[Cert]
[Suffix]
1
2
3
4
5
6
7
8
9
10
1
Component
WP = Water Pump
5
Shaft
C = Carbon
S = Stainless 9
Certifications
Omit if n/a
E = E-Mark
C = CSA
U = UL
–––––––––––––––––––––––
–––––––––––––––––––––––
–––––––––––––––––––––––
2
Model
29
32
120
150
6
Orientation
H = Horizontal
V = Vertical
D = Dual
See manual for definition
10
Suffix
Denotes model variation
–––––––––––––––––––––––
–––––––––––––––––––––––
–––––––––––––––––––––––
3
Communication
L = PWM
Omit for CAN
7
I/O
A = Address Input
C = Temperature Input
B = Address or Temp Input
(Specified in Calibration)
P = Pressure
M = PWM High (modulated)
L = PWM Low (modulated)
–––––––––––––––––––––––
–––––––––––––––––––––––
4
Voltage
12V = 12 volt
24V = 24 volt
8
OEM
Omit if n/a
–––––––––––––––––––––––
–––––––––––––––––––––––
WP32-24V-CH-A = Water Pump model 32, 24 volt, CAN communication, Carbon shaft, Horizontal orientation,
addressable via external resistors.
NOTE: All EMP WP29/WP32 water pumps use CAN communication.
NOTE: Not every option combination is available.

Installation
© 2017 EMP, Inc. 9
Installation
Environment
Environment cleanliness is crucial to pump life. The WP29 and WP32 are certified with an IP67 rating but debris
collection in the weep pocket can lead to premature seal failure. Shielding may be required to ensure debris
does not enter the weep hole. If you have any questions regarding your installation contact EMP.
CAUTION: Blocked weep holes will cause pump damage due to blocked vent allowing fluid to
accumulate inside the pump.
Orientation
Each pump part number has a specified and approved orientation. If the pump is not properly installed several
failure modes could potentially result. Orientation is noted on the component label.
EMP has found the most robust installations make use of horizontal orientation pumps. For new applications,
EMP is encouraging the use of horizontal orientation pumps. EMP pumps must be attached to a vertical or
horizontal mount. Pumps labeled with orientation “up” arrows must be installed with the arrow pointing upward,
no other orientation is acceptable.
Vertical Pump Orientation Label Horizontal Pump Orientation Label
Pumps that do not have an orientation label must still be installed in a specific orientation. Specific part numbers
may require a mounting in a specific orientation or support both “Vertical” and “Horizontal” orientations.
!

Installation
© 2017 EMP, Inc. 10
EMP pumps are designed to operate with the shaft horizontal but will function well if the shaft is between -10°
and 10° of horizontal. Pumps must not be mounted more than -15° from the design orientation. Weep collection
is maximized at 0° from the design orientation.
Vertical Pump Orientation
NOTE: Weep collection is maximized at 0° and minimized at -15° orientation.
Horizontal Pump Orientation

Installation
© 2017 EMP, Inc. 11
Incorrect Pump Orientation and Reasons
The WP29 and WP32 contain a mechanical seal; 0.1cubic centimeters per hour may weep past the seal as a
part of normal operation. To properly collect the weepage pump orientation is important. Too steep of an angle
will not allow the fluid to collect in the weep pocket and evaporate off and the pump may appear to be leaking
when in fact it is operating as designed. An incorrect mounting angle may also result in too much fluid being
retained in the weep pocket resulting in bearing contamination and reduced service life.

Installation
© 2017 EMP, Inc. 12
Plumbing
Pump Inlet must be plumbed using 25.4mm (1.0 inch) diameter hose
and/or thin walled tubing from the fluid supply to the pump inlet. A
restriction in the inlet plumbing is allowed as long as the flow
diameter is not less than 17 mm (0.75 inch) and does not exceed
25.4 mm (1.0 inch) in length.
CAUTION: Localized high spots in the plumbing will cause
air to be trapped in the pump causing the pump to be air locked.
The result of air trapped in the pump is loss of prime and no fluid
moving resulting in water seal damage or potential system
component damage.
CAUTION: EMP warranty does not cover seal damage due to low lubrication.
Improper installation with localized high spots
Deviations from the recommended plumbing must meet the inlet requirements specified in the installation
manual.
Hose Clamps
When making the inlet and outlet hose connections to the pump it is recommended to use SAE20CT worm drive
type hose clamps. Torque worm drive clamps to 45 in-lbs per SAE J1508. Spring type clamps are not
recommended.
!
!

Installation
© 2017 EMP, Inc. 13
System Fill Procedure
CAUTION: Do not run the pump without fluid present. If run dry even for a short period the seal will
be damaged.
CAUTION:Pump may start running upon connection of power, ground and ignition. Do not make
electrical connections until pump and system are filled with fluid.
CAUTION:Systems that are not properly filled may leave air in the pump, creating a condition that
may damage the seal due to low lubrication.
CAUTION:When air becomes trapped in the pump, the pump will not circulate fluid with the potential
to cause damage to components in the system.
CAUTION:EMP warranty does not cover seal damage due to low lubrication.
Approved Fluids
1. Fluids must conform to ASTM D6210-10 or ASTM D3306 for quality and maintenance.
2. Use of coolants containing silicates and phosphates can lead to reduced pump seal life and gel formation
in cooling system components.
3. Use of organic acid technology (OAT) coolants that are silicate and phosphate free will maximize pump
seal life.
4. Customer must verify all WP29/32 fluid contacting parts are compatible with system components and the
coolant selected for the application.
5. For best results cooling system materials, coolant working life, operating temperature range and other
system details should be reviewed with coolant manufacturer to ensure the proper coolant selection.
NOTE: Use distilled water to dilute coolant or use pre-mix coolant.
CAUTION: Use of “Stop Leak” or radiator cleaner style system additives is not approved.
Fill Procedure
Caution must be taken to ensure the system is refilled properly to prevent running the pump in a dry state.
1. Install pump and piping according to installation instructions.
2. Ensure flow path is open through the entire system.
3. Fill the system with fluid such that the pump is full of fluid and there are no air pockets in the piping
leading to the pump.
4. Run the pump at top speed (4600 rpm), ensuring fluid levels are topped off as air is pushed out of the
system.
CAUTION: Do not allow the pump fluid supply to become empty. The fluid level in the surge tank will
drop rapidly at top speed.
5. Verify the pump is moving fluid by observing the input power of the pump during the fill process using
EMPower Connect service tool or a quality amp meter. With the pump operating at 4600 rpm, the input
power must be above 200W (28V and 7A or 14V and 14A). If the pump is below 200W within 1 minute,
turn off pump, purge system air and restart the procedure.
!
!
!
!
!
!
!

Installation
© 2017 EMP, Inc. 14
Wiring
For complete connector body sealing; the ignition, power, and ground wires should be 12ga minimum. Wire
jacket diameter must be compatible with seal requirements
Recommended Wiring Practices
•Wiring or electrical harness must not rub on sharp edges.
•The electrical harness should not be stressed at connections. Wires pulling on connectors can
compromise the connector body seal and possibly create a water intrusion event.
•The voltage drop between the battery and the pump should not exceed 5% of the rated battery voltage.
This should be verified at the pump’s maximum current draw. Wiring or electrical harness must not rub
or make contact with a hot surface. There should be 5" minimum clearance from the exhaust.
•Wiring or electrical harness should be supported at least every 18" to 20".
•To avoid possible fire or shock, do not pinch any wiring or electrical harnesses.
•Incorporate Drip Loops into wiring designs. The pump connectors are environmentally sealed.
However, good wire management can help ensure a good seal over the life of the product. Drip loops
collect water and shed it away from connector.
•The use of Dielectric Grease such as Dow Corning DC-4 is acceptable as long as the connection is
mated directly after grease application to prevent dirt from being captured by the grease.
NOTE: Wires pulling on connectors can
compromise the connector body seal and possibly
create a water intrusion event. This is
unacceptable wire routing.
Bad Wiring – Harness stressed at connections
NOTE: Wire routing can provide a path for water
to flow down into the connector. This is
unacceptable wire routing.
Bad Wiring – No drop loops
NOTE: Drip loops collect water and shed it away
from connector. This is acceptable wire routing.
Good Wiring – Drip loops

Installation
© 2017 EMP, Inc. 15
Connector Information
NOTE: These represent the controller connectors — not the mating harness connectors.
NOTE: Addressing and motor status message information can be found in Component Controller CAN
Communication,EMP document 9980001068.
NOTE: Ignition enable is a wake up signal sent to the controller to turn on. This is separate from the power
and ground and should be tied to a switched source and not tied to the component power.
The following notes apply to all connectors:
NOTE: All cavities in the mating connector must either be terminated or plugged to prevent moisture from
entering the controller.
NOTE: To operate the component, pin 4 (IGNITION ENABLE) must be connected +9 to 32vdc. This can be
wired directly to ignition, to a PLC output, through a manual switch or through a thermal switch. This line
will draw less than 10 mA. All switches used on this line can be sized based on this amperage requirement.
This input should be fused close to the source to protect the vehicle wiring.
Mating Connectors
The mating connectors and pins are available from EMP.
6 Pin Connector Deutsch Part Numbers
EMP Kit # 1370001077
4 Pin Connector Deutsch Part Numbers
EMP Kit # 1370001078
Description
Part Number
Description
Part Number
Socket Pins
0462-201-20141
Socket Pins
0462-203-12141
Connector Body
DTM06-6S
Connector Body
DTP06-4S
Wedge Lock
WM-6S
Wedge lock
WP-4S
Plugs
0413-204-2005
Plugs
114017
NOTE: If CAN or Serial TTL control is not used the 6 pin DTM connector must be blocked off to prevent
entry of water or dirt which will result in damage to the component. All pumps are shipped with this blocked
off connector. If lost or damaged, a block off plug, EMP P/N 3250001030 can be purchased.
1 – CAN HI
2 – CAN SHIELD
3 – SERIAL GND
4 – SERIAL TX
5 – SERIAL RX
6 – CAN LO
1 – TEMP INPUT OR CAN ADDRESS
2 – GND
3 – BATT
4 – IGNITION ENABLE

Installation
© 2017 EMP, Inc. 16
On/Off Single Speed Control
Example On/Off Application Schematic
NOTE: All cavities in the mating connector must either be terminated or plugged to prevent moisture from
entering the controller.
Accessories available for purchase
Power/ground/ignition enable harness (6’ long)
1370005038 comes with a plug for the
communication connector. This harness has a 30
amp mini-fuse for the power line. Ignition enable
must be fused separately. All vehicle side wires are
not terminated.
Switched power/ground/ignition enable harness (6’
long) 3170002241 includes a toggle switch and 5
amp mini-fuse on the ignition enable line and a 30
amp mini fuse on the power line. All vehicle side
wires are terminated with ring terminals. 3/8” for
power and ground, #10 for ignition enable.
EMP parts kit 1370056018 includes a mini-fuse
holder, cover, fuses, and the wiring parts required for
installation of the holder.
Also see Mating Connectors.
Operation
CAUTION: For pumps, ignition enable should
not be supplied if the component is dry or if the
flow path is restricted or if flow relies on another
source (such as an engine component) which is
not running. In these cases, be sure ignition
enable is sourced from a supply that is active only
when the flow will not be restricted.
NOTE: In all cases, the ignition enable pin (pin 4
on the 4-pin connector) must not be tied to
battery power to allow for controller shut down.
Ignition enable should not be shut down at the
same time power is cut off. The ignition input must
be used to turn the component “on” and “off”. This
is to ensure that the controller shuts down
properly.
Components wired for on/off operation will go to
default speed after the CAN TIMEOUT period. This
time may be calibrated and is usually between 0.1
and 5 seconds.
For exact controller parameters, contact
[e-mail] with the serial number of
the component.
NOTE: See Installation Manual WP29 and WP32
Electric Water Pump, EMP document 9970002273
for additional operation information including
installation for use on a CAN bus.
!

Routine Maintenance/Service Tool
© 2017 EMP, Inc. 17
Routine Maintenance
Frequency
Action
When checking/filling vehicle
fluids
Ensure fluid levels are correct. Low fluid can cause a pump seal failure.
Every engine oil change or every
three months, whichever is
shorter
Inspect cooling system for leaks. Sample coolant and check to ensure coolant
meets minimum coolant quality requirements. Before removing the pump, evaluate
the leak using the methods outlined in the physical inspection of this document.
Every three months or more
often if conditions are harsh*
Visually inspect exterior of pump and ensure weep holes are not clogged by debris.
Check wires for wear or frayed insulation. Ensure all electrical connections are
tight.
Annually+
Ensure connections are tightened to proper torque rating. Ensure all wires and pin
connections are intact. Inspect support structure for any damage or loose
hardware.
+ Inspections should also be conducted after any service to the unit.
Physical Inspection
CAUTION: Do not run the pump without fluid present. If run dry even for a short period the seal will
be damaged.
CAUTION:Pump may start running upon connection of power, ground and ignition. Do not make
electrical connections until pump and system are filled with fluid.
1. Make sure the weep hole ports are not clogged with debris. If weep holes are plugged then open them up.
Weep Hole Ports
NOTE:Images do not represent acceptable mounting positions. They are for reference only.
EMPower Connect™ Service Tool
Monitoring operation and manual control of the pump can be accomplished using the service tool EMPower
Connect service tool which is part of the EMP Service Suite available at no cost on the EMP website.
To use EMPower Connect service tool, download and install the Service Suite software on a Windows PC. An
interface device will be needed between the computer and the pump. If the pump is being run without J1939
CAN, use an interface cable from the 6 pin Deutsch connector on the pump and an EMP USB/TTL converter.
The harness and converter are available as a kit (P/N 7500038001). If the pump is on a J1939 CAN bus EMPower
Connect service tool can be connected using an RP1210 compatible Data Link Adapter (DLA) to interface to the
CAN bus.
!
!

Troubleshooting
© 2017 EMP, Inc. 18
Troubleshooting
Symptom
Check
Pump not running
•Check electrical connections.
•Check ignition enable wire.
•Check if ignition enable wire is “on”.
•
Verify ignition enable pin location.
Pump is running but not pumping
fluid
•
Check system fluid level.
•Check for tubing restrictions (kinks).
•Make sure pump is primed.
•Check for collapsed inlet or outlet hose.
•
Check pump inlet for trapped debris.
No CAN communication and/or
pump not responding to CAN
commands
•Check communication harness wiring.
•Verify that CAN messages are being transmitted in the proper formats.
•
Verify that the proper component CAN address is being used.
Suspected water pump seal leak
•
Reference
Service Bulletin Electric Water Pump Inspection and Diagnostic
Procedures, EMP document 9910085143.
Water pump seal leak
•Verify coolant level.
•Verify coolant selection (for water seal life OAT, phosphate free, silicate free
coolant is recommended).
•Sample coolant and review coolant maintenance records.
•Verify system is not aerated (Reference document 9910085145, Fill D&D Test
and Acceptance Criteria).
•
Check for cavitation or low inlet pressure.
Pump producing excessive noise
•Check for cavitation or low inlet pressure.
•Check pump inlet for trapped debris.
•Check plumbing around pump for valves or components where cavitation may
be occurring.
•
Check for collapsed inlet hose.