Walchem EH Series User manual

EH & EZ Series
Electronic Metering Pump
Instruction Manual
Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA TEL [phone] FAX [phone]
WEBSITE: www.walchem.com

Notice
© 2007 WALCHEM Corporation
Five Boynton Road, Holliston, MA 01746 USA
tel [phone] fax [phone]
All Rights Reserved
Printed in USA
Proprietary Material
The information and descriptions contained herein are the property of
WALCHEM Corporation. Such information and descriptions may not be copied
or reproduced by any means, or disseminated or distributed without the express
prior written permission of WALCHEM Corporation.
This document is for information purposes only and is subject to change without
notice.
Statement of Limited Warranty
WALCHEM Corporation warrants equipment of its manufacture and bearing its
identification to be free from defects in workmanship and material for a period
of two years from date of delivery from the factory or authorized distributor
under normal use and service and otherwise when such equipment is used in
accordance with instructions furnished by WALCHEM Corporation and for the
purposes disclosed in writing at the time purchased, if any. WALCHEM
Corporation’s liability under this warranty shall be limited to replacement or
repair, F.O.B. Holliston, MA U.S.A. of any defective equipment or part which,
having been returned to WALCHEM Corporation, transportation charges
prepaid, has been inspected and determined by WALCHEM Corporation to be
defective.
THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EITHER
EXPRESS OR IMPLIED, AS TO DESCRIPTION, QUALITY, MERCHANT-
ABILITY, FITNESS FOR ANY PARTICULAR PURPOSE OR USE, OR ANY
OTHER MATTER.
P/N E00008.L
March 2007

TABLE OF CONTENTS
Thank you for choosing a Walchem EH or EZ Series metering pump. This instruction manual
deals with the correct installation, operation, maintenance and troubleshooting procedures for
the EHB, EHC and EZ model metering pumps. Please read through it carefully to ensure the
optimum performance, safety and service of your pump.
1.0 INTRODUCTION...........................................................................................................1
1.1 Safety and Caution Notes..........................................................................................1
1.2 Principle of Operation ................................................................................................1
1.3 Model Code ...............................................................................................................2
1.4 Specifications ............................................................................................................3
1.5 Dimensions................................................................................................................4
2.0 INSTALLATION ............................................................................................................8
2.1 Unpacking .................................................................................................................8
2.2 Location.....................................................................................................................8
2.3 Supply Tubing .........................................................................................................10
2.4 Discharge Tubing ....................................................................................................11
2.5 Installing Injection/BackPressure Valve ...................................................................11
2.6 Electrical..................................................................................................................12
3.0 OPERATION ............................................................................................................... 13
3.1 Priming .................................................................................................................... 13
3.2 Adjustment .............................................................................................................. 13
3.3 Calibration ...............................................................................................................14
3.4 External Control....................................................................................................... 14
3.5 STOP Function........................................................................................................ 25
3.6 AC Power Interruption (Y-Control Module) ..............................................................25
3.7 Auto Air Vent Valve Operation .................................................................................26
3.8 MultiFunction Valve Operation................................................................................. 26
3.8 MultiFunction Valve Operation................................................................................. 27
4.0 MAINTENANCE .......................................................................................................... 28
4.1 Diaphragm Replacement ......................................................................................... 28
4.2 Valve Replacement .................................................................................................28
4.3 Tubing .....................................................................................................................28
5.0 EXPLODED VIEW & PARTS GUIDE ..........................................................................29
6.0 TROUBLESHOOTING ................................................................................................41
7.0 SERVICE POLICY ......................................................................................................42

1
1.0 INTRODUCTION
1.1 Safety and Caution Notes
Always wear protective clothing, eye protection and gloves before working on or near a
metering pump. Follow all recommendations of the supplier of the solution being
pumped. Refer to the MSDS from the solution supplier for additional precautions.
Walchem EH and EZ Series metering pumps should be installed where ambient
temperatures do not exceed 122°F (50°C) or do not fall below 32°F (0°C), or where
pump or tubing are directly exposed to sunlight.
WARNING Risk of electrical shock! This pump is supplied with a grounding
conductor and grounding-type attachment plug. To reduce the risk of electrical shock,
be certain that it is connected only to a properly grounded, grounding type receptacle
with ratings conforming to the data on the pump data plate. Prior to performing any
maintenance on a pump, disconnect the pump from the electrical power source.
Plumbing Precautions
All tubing must be securely attached to the fittings prior to starting the pump (see
Section 2.3). Only use Walchem tubing with your pump. Tubing should be shielded to
prevent possible injury in case of rupture or damage. UV resistant tubing should be
used if the tubing is exposed to UV light. Always adhere to local plumbing codes and
requirements. Be sure that the installation does not constitute a cross connection.
Walchem is not responsible for improper installations. Prior to performing any
maintenance on a pump, depressurize the discharge tubing.
If you are pumping downhill or into little or no system pressure, a back pressure/anti-
syphon device must be installed to prevent over-pumping. Contact your Walchem
distributor for additional information.
Solution Compatibility
CAUTION! This pump has been evaluated for use with water only. The suitability of
this pump for use with liquids other than water (such as acid and alkaline) is the
responsibility of the user. For liquids other than water, select the best-suited liquid end
material combination using a chemical compatibility chart.
1.2 Principle of Operation
The EH and EZ series electronic metering pumps consist of a pump unit, a drive unit,
and a control unit. The drive unit is an electromagnetic solenoid. When the solenoid
coil is energized by the control unit the armature shaft moves forward due to the
magnetic force of the solenoid. The shaft is attached to a PTFE faced diaphragm which
is part of the pump unit. The diaphragm is forced into the pump head cavity decreasing
volume and increasing pressure which forces liquid in the pump head out through the
discharge check valves. When the solenoid coil is de-energized, a spring returns the
armature to its starting position. This action pulls the diaphragm out of the head cavity
increasing volume and decreasing pressure. Atmospheric pressure then pushes liquid
from the supply tank through the suction check valves to refill the pump head.

2
1.3 Model Code
EH B15 R 1 - VC C
1 2 3 4 5 6
1 Pump Series
EH Electronic metering pump with external pulse control or manual speed
control (adjustable to 360 strokes per minute) and manually adjustable
stroke length. (Typical turndown ratio 125:1.)
EZ Electronic metering pump with manual speed control (adjustable to 360
strokes per minute)
2 Capacity/Pressure Rating (See Section 1.4 for detailed chart.)
3 Control Module
D For use on all EZ models, features digitally adjustable speed and fixed
stroke length
RFor use on all EHB & EHC models, features external pulse control.
YFor use on all EHB & EHC models, features analog and external pulse
control with pulse divide and multiply capability.
4 Voltage
1115 VAC, 50/60 Hz
2230 VAC, 50/60 Hz
5 Liquid End (See Section 1.4 for detailed chart.)
6 Options
CHigh Compression Head: Supplied standard with auto air vent valve in
place of manual air vent valve. Available for EHB10, EHB15, EHC15
and EHC20 sizes with -VC liquid ends only.
MMultifunction Valve is supplied in place of the manual air vent valve.
Available for the EZ and EHB/C 10-20 sized pumps with VC, VE, VF,
PC, PE, PCH and PEH liquid ends. Not available with the AAVV
feature.
AAuto Air Vent Valve supplied in place of manual air vent valve.
Available for EZ and EH Series in B10, B15, C15 and C20 sizes with –
VC liquid ends only.
HHigh Pressure Head available only for PC/PE liquid ends. Available
for EHB10 and EHC15 sizes only. Rated @ 215 PSI.

3
1.4 Specifications
Electrical 50/60 Hz, single phase
EHB/EZB 115 VAC±10% 0.9 Amp max. 16 watt avg.
230 VAC±10% 0.4 Amp max. 16 watt avg.
EHC/EZC 115 VAC±10% 1.4 Amp max. 24 watt avg.
230 VAC±10% 0.6 Amp max. 24 watt avg.
Operating Conditions
Ambient temperature 32°F to 122°F (0°C to 50°C)
Relative humidity 30% to 90% non-condensing
Liquid temperature 32° to 104°F (0 to 40°C) for PVC based liquid ends
32° to 140°F (0 to 60°C) for PP, PVDF, SS based liquid ends
Capacity/Pressure Rating
Maximum
Output Capacity
Output
per Stroke (mL)
Maximum
Pressure
3
Size (Gal/hr) (mL/min) Min. Max. PSI MPa
Connection
Size (in)
Tubing O.D
2
B10
1
0.6 38 0.05 0.11 150 1.0 3/8
B10(H) 0.5 30 0.04 0.08 215 1.5 3/8
B15
1
1.0 65 0.09 0.18 105 0.7 3/8
B20
1
1.5 95 0.13 0.26 60 0.4 3/8
B30
1
3.2 200 0.28 0.56 30 0.2 1/2
C15 1.3 80 0.09 0.22 150 1.0 3/8
C15(H) 0.8 50 0.06 0.14 215 1.5 3/8
C20 2.0 130 0.14 0.36 105 0.7 3/8
C30 4.3 270 0.30 0.75 50 0.35 1/2
C35
4
6.7
4
420
4
0.46 1.17 30 0.2 1/2
1
Available sizes for EZ pumps
2
1/4” NPT female for 316 SS
3
Auto Air vent valve reduces maximum pressure approx. 35 PSI (0.2 MPa)
4
EZC35 rated output is 6.3 GPH (400 ml/min)
Adjustment Range
Stroke length adjustment range 40% to 100% (EHB and EHC only)
Frequency adjustment range 0 to 360 strokes per minute
Materials of Construction
Liquid End
Code
Pump Head
& Fittings Diaphragm
Valve
Balls
Valve
Seat
Valve
Seals Gasket Tubing
PC GFRPP CE FKM FKM
PE GFRPP CE EPDM EPDM
VC PVC CE FKM FKM
VE PVC CE EPDM EPDM
VF PVC PTFE EPDM EPDM
TC PVDF CE FKM FKM
FC PVDF CE PCTFE PTFE
PE
SH SS
PTFE
(bonded to
EPDM)
HC HC PTFE
PTFE
¼” NPTF
CE Alumina ceramic PE Polyethylene
EPDM Ethylene propylene diene monomer PTFE Polytetrafluoroethylene
FKM Fluoroelastomer PVC Polyvinylchloride (translucent)
GFRPP Glass fiber reinforced polypropylene PVDF Polyvinylidenefluoride
HC Hastelloy C276 SS 316 stainless steel
PCTFE Polychlorotrifluoroethylene

4
1.5 Dimensions
EH Models with thermoplastic liquid ends and air vent valves
EHB Model shown for reference
Model A B C D E F G H J L
P&Q
TUBIN
G
W
EHB
10
15
20
R1
R2 2.64 1.42 0.83 3.54
1.46
(3.01)
1
[1.83]
3
0.20 5.91
[6.13]
3
7.24
{7.56}
2
[8.40]
3
1.02
7.48
(9.07)
1
{7.72}
2
[7.85]
3
3/8 OD
1/4 ID 3.94
EHB 30
R1
R2
-PC
-PE
-VC
-VE
-VF
-TC 2.64 1.57 0.83 3.54 0.87 0.20 8.04 8.04 0.31 7.05
(7.41)
2
1/2 OD
1/4 ID 3.94
EHC 15
20
R1
R2 3.82 1.26 0.67 3.94
1.46
(3.01)
1
[1.83]
3
0.20 6.30
[6.44]
3
7.64
{7.95}
2
[8.75]
3
1.42
8.35
(9.90)
1
{8.58}
2
[8.72]
3
3/8 OD
1/4 ID 4.57
EHC 30
35
R1
R2
-PC
-PE
-VC
-VE
-VF
-TC
3.82 1.42 0.67 3.94 0.87 0.20 8.44 8.44 0.71 7.92
(8.29)
2
1/2 OD
3/8 ID 4.57
1
With Auto Air Vent Valve
2
With Y-Control Module
3
With Multifunction Valve
Mounting Dimensions R S T V Z X
EHB all variations 3.46 0.28 0.65 0.37 0.91 0.24
EHC all variations 3.94 0.28 0.67 0.39 1.81 0.24
All dimensions in inches
DISCHARGE
AIR
VENT
F
W
J
D
G
H
L
E
Q
P
SUCTION
C
A
B
R
S
T
V
Z
X

5
EH-FC Models without an air vent valve
EHB Model Shown for reference
Model A B C D E F G H J L P&Q
TUBING W
EHB 10
20
R1
R2 -FC 2.64 1.38 0.83 3.54 0.47 0.20 6.04 7.07
(7.56)
!
1.04 6.46 (6.81)
!
3/8 OD
1/4 ID 3.94
EHB 30 R1
R2 -FC 2.64 1.57 0.83 3.54 0.63 0.20 6.77 7.07
(7.56)
!
0.31 6.81 (7.17)
!
1/2 OD
3/8 ID 3.94
EHC 15
20
R1
R2 -FC 3.82 1.22 0.67 3.94 0.47 0.20 6.46 7.46
(7.95)
!
1.42 7.36 (7.75)
!
3/8 OD
1/4 ID 4.57
EHC 30
35
R1
R2 -FC 3.82 1.42 0.67 3.94 0.63 0.20 7.17 7.46
(7.95)
!
0.71 7.68 (8.05)
!
1/2 OD
3/8 ID 4.57
!
With Y-Control Module
Mounting Dimensions R S T V Z X
EHB all variations 3.46 0.28 0.65 0.37 0.91 0.24
EHC all variations 3.94 0.28 0.67 0.39 1.81 0.24
All dimensions in inches
L
E
Q
C
A
BP
R
S
T
V
Z
X
F
W
J
D
G
H

6
EH Models with stainless steel liquid end materials
EHB Model Shown for reference
Model A B C D E F G H J L P&Q
TUBING W
EHB 10
20
R1
R2 -SH 2.64 1.38 0.83 3.54 1.34 0.20 5.75 7.07
(7.56)
!
1.34 7.38 (7.74)
!
¼” NPTF 3.94
EHC 20
R1
R2 -SH 3.82 1.22 0.67 3.94 1.34 0.20 6.14 7.46
(7.95)
!
1.73 8.29 (8.66)
!
¼” NPTF 4.57
30 6.53 1.34
EHC
35
R1
R2 -SH 3.82 1.38 0.67 3.94 1.30 0.20
6.50
7.46
(7.95)
!
1.22
8.29
(8.66)
!
¼” NPTF 4.57
!
With Y-Control Module
Mounting Dimensions R S T V Z X
EHB all variations 3.46 0.28 0.65 0.37 0.91 0.24
EHC all variations 3.94 0.28 0.67 0.39 1.81 0.24
All dimensions in inches
F
W
J
D
G
H
L
E
DISCHARGE
Q
OD ¼"
P
A
B
SUCTION
C
V
Z
T
S
R
X

7
EZ Models with thermoplastic liquid end materials
EZB Model Shown for reference
All dimensions in inches
Model A B C D E F G H J L P & Q
TUBING W
-VC
-PC
-TC
-VE
-PE
-VF
3.21 0.87 0.08 3.54
1.46
(3.03)
1
[1.83]
2
0.20 5.91
[6.11]
2
7.24
[8.39]
2
1.02
7.44
(9.53)
1
[7.81]
2
3/8” O.D. 3.94
10
15
20 -FC 3.21 0.87 0.08 3.54 0.51 0.20 6.09 6.83 1.00 6.50 3/8” O.D. 3.94
-VC
-PC
-TC
-VE
-PE
-VF
3.21 1.02 0.08 3.54 0.87 0.20 6.75 8.00 0.32 7.01 1/2” O.D. 3.94
EZB
30
D1
D2
-FC 3.21 1.02 0.08 3.54 0.63 0.20 6.85 6.85 0.24 6.77 1/2” O.D 3.94
-VC
-PC
-TC
-VE
-PE
-VF
4.13 0.94 --- 3.94
1.46
(3.03)
1
[1.83]
2
0.31 6.30
[6.50]
2
7.64
[8.79]
2
1.42
8.15
(10.24)
1
[8.52]
2
3/8” O.D. 4.57
15
20
-FC 4.13 0.94 --- 3.94 0.51 0.31 6.48 7.44 1.39 7.20 3/8” O.D. 4.57
-VC
-PC
-TC
-VE
-PE
-VF
4.13 1.10 --- 3.94 0.87 0.31 7.11 8.37 0.71 7.72 1/2” O.D. 4.57
EZC
30
35
D1
D2
-FC 4.13 1.10 --- 3.94 0.63 0.31 7.44 7.44 0.63 7.48 1/2” O.D. 4.57
1
Dimension with automatic air vent valve option
2
With Multifunction valve
Mounting Dimensions R S T X V Z
EZB all variations 3.46 0.28 0.63 0.24 0.39 1.26
EZC all variations 3.94 0.59 1.18 0.28 0.59 1.18
CB
P
X
Z
R
ST
V
L
E
A
Q
FJ
W
H
G
D

8
2.0 INSTALLATION
2.1 Unpacking
Open the shipping carton and inspect contents for damage. If any items are
missing or damaged contact your local distributor.
Pumps are pre-primed with water at the factory. If the application is not
compatible with water, drain and dry before use. Be sure to remove caps
from fittings before attaching tubing.
CAUTION: Head bolts may have loosened during storage or shipment.
Be sure to check and tighten to 19 lb-in torque, if necessary.
Do not handle or move the pumps using the Control Module only. The pump
should be supported by the base or drive unit during handling
2.2 Location
Choose a location for the pump which is clean, dry, close to an electrical outlet,
and allows convenient access to stroke length control, frequency control, and
tubing connections. Avoid areas where ambient temperature exceeds 122°F
(50°C) or falls below 32°F (0°C), or where the pump or tubing would be exposed
to direct sunlight.
This pump is cord connected and not intended for permanent mounting to a
building structure. However, temporary mounting to stabilize the pump during
operation may be necessary as long as tools are not required for the installation
or removal of the pump.
Flooded suction (mounting the pump below the level of liquid in the supply tank)
is strongly recommended, especially when pumping liquids that readily generate
gas bubbles. Sodium hypochlorite and hydrogen peroxide are common examples
of such liquids. (See Figure 1.)
If flooded suction mounting is not possible, a shelf adjacent to (but not directly
above) the supply tank often works well. (See Figure 2.) The supply tank or
cover can also be used if it has provisions for mounting a pump. (See Figure 3.)
In any case, the total suction lift should not exceed 5 ft (1.5m).

9
Figure 1 Figure 2 Figure 3
Flooded Suction Shelf Mount Tank Mount
Figure 4 Connecting Tubing
Foot Valve
Pipe Tubing Straightener
(user supplied)
Air Gap
Return Line
Point of
Injection
Injection
Valve
Coupling Nut
Coupling Nut
(Air Vent Valve)
Coupling Nut

10
2.3 Supply Tubing
The supply tubing run should be as short as possible. For flooded suction
mounting, install a shut-off valve with an appropriate tubing connector at the
tank outlet. Cut a length of tubing from the coil supplied and install between the
shut-off valve and the pump inlet fitting. For suction lift applications, slide on
the ceramic weight, then install a foot valve on one end of suction tubing. Cut the
tubing to a length such that the foot valve hangs vertically about 1 in (25mm)
above the bottom of the tank. Avoid any loops in the tubing run that could form
a vapor trap. Running the tubing through a length of pipe will help to keep tubing
straight. Total vertical suction lift should be no more than 5ft. (1.5m).
Reference Figure 4.
Attach tubing as shown in Figure 5. First slide the coupling nut, small end first,
onto the tubing. Push the tubing over the valve housing tip
all the way to the
valve housing shoulder . (Tip: if the tubing is stiff from cold, dip the tubing end
in hot tap water for a few minutes so it will slide on and flare out more easily.
Push the coupling nut onto the threads. Apply some pressure on the coupling nut
and tubing while tightening the nut, making sure the tubing has not backed off of
the shoulder of the valve housing.
WARNING: All fittings and coupling nuts should be tightened by hand only. If
necessary, a small tool may be used to make it snug. DO NOT use excessive
force or large wrenches.
The coupling nut should not bottom out completely against the fitting. If this
happens during connection, either the tubing has slid down the shoulder while
tightening, or the tubing has been pinched. Remove the coupling nut, re-cut the
tubing and re-connect.
WARNING : If there is any leakage around the coupling nut and it appears to
have been installed correctly, DO NOT TIGHTEN the coupling further! Release
pressure in the line, disconnect tubing, re-cut and re-connect. Tightening of
misinstalled tubing may cause the tubing to pop off under pressure.
Figure 5 Attach Tubing
Valve
Housing
Shoulder
Cou
p
lin
g
Nut
Tubing

11
2.4 Discharge Tubing
Cut a length of tubing long enough to go from the pump to the application
(injection) point. Additional tubing can be ordered from your distributor. Avoid
sharp turns or bends and hot surfaces. Routing tubing through rigid pipe such as
PVC pipe is recommended for long runs and/or as protective shielding against
corrosive chemicals. If applicable, install the injection valve in 1/2” NPT thread
at the injection point (see section 2.5) and connect the discharge tubing to the
injection valve.
Attach tubing as described in section 2.3 and as shown in Figures 5 and 6. Note:
Some models have an air vent valve with two outlet connections. The
connection marked ‘OUT’ is the discharge side to the application point. (Fig 6).
Attach a second length of tubing to the air vent side marked (‘AIR’) and route
back to the chemical solution tank or drum. On the larger pumps (30 & 35
sizes), the air vent valve connections are not marked, however, the discharge side
is the vertical (UP) connection and the air vent connection is on the side of the
valve.
Figure 6 Air Vent Valve Tubing
2.5 Installing Injection/BackPressure Valve
A fitting or tee with 1/2” NPTF threads and with sufficient depth will accept the
injection valve assembly. If required, trim off an amount of the extension tip
until it fits your fitting or tee. (Fig. 7.)
The position of the injection/back pressure valve can be at any orientation as
long as the spring is retained in the valve. DO NOT REMOVE THE SPRING.
Be sure to check and replace the spring as needed. Attach the tubing following
the same instructions in section 2.3, connecting the supply tubing.
CAUTION: Some chemicals may have reactions as they are injected into the
main flow. For example, sulfuric acid may react with water causing excess heat.
"AIR"
"OUT"
Drains back to tank
Discharges to injection point

12
If the chemical is heavier than water, mount the injection valve as close as
possible to vertical coming into the bottom of the pipe. This will keep the
injection nozzle facing up and keep the heavier chemistry from draining into the
pipe and causing adverse reactions within the injection valve and pipe.
In addition to preventing backflow from pressurized lines, the injection valve
acts as a back pressure valve when pumping into atmosphere or low pressure
applications. However, the back pressure by the injection valve can vary and the
valve does NOT act as an anti-siphon valve. If siphoning is a possibility, or if
pumping downhill into open atmosphere (open tank), a Walchem MultiFunction
valve or a separate back pressure/anti-siphon valve must be installed.
Note: Siphoning can also occur at the tip of the injection valve because of the
high flow rate in the main pipe flowing past the small injection nozzle (venturi
effect). In this case, an anti-siphon device must be installed to avoid over
feeding or siphoning of chemistry.
Figure 7 Injection Valve
See Section 5.0 for complete liquid ends parts list and exploded view.
2.6 Electrical
WARNING Risk of electrical shock! This pump is supplied with a
grounding conductor and grounding-type attachment plug. To reduce the risk of
electrical shock, be certain that it is connected only to a properly grounded,
grounding type receptacle.
Connect the pump power cord to a
GROUNDED outlet supplying proper
voltage. Avoid branch circuits that also supply power to heavy machinery or
other equipment that could generate electrical interference.
Trim back as needed
to fit tee or fitting
Injection/Back Pressure Valve

13
3.0 OPERATION
3.1 Priming
Install the pump as described above. With the pump turned on, set stroke length
at 100% and frequency at 100%. If the pump is equipped with an air vent valve,
open the knob 1/2 turn. Liquid should move through the suction tubing and into
the pump head. When liquid starts running through the vent side tubing, close
the air vent knob and continue with output adjustment described below. If the
pump has no air vent valve, disconnect the discharge tubing from the injection
valve. When liquid enters the discharge tubing at the pump head, stop the pump
(set frequency knob to 0% on the R-Control module). Then reconnect the
discharge tubing to the injection valve.
If the pump does not self prime, remove the check valve housing on discharge &
suction sides to make sure valve cartridges and gaskets are in correct positions
(see section 4.2 for correct orientation).
Note: Pumps with FC liquid ends should use flooded suction when priming, due
to the hard valve seat material.
3.2 Adjustment
A. EZ Pumps using the ‘D’ Control Module
If less than full output is required, set the frequency to the appropriate percentage
of maximum desired.
Example: Model EZB20D1-VE has maximum output of 1.5 GPH.
Desired output is 1.2 GPH. 1.2 ÷ 1.5 = 0.8 or 80%
Set the frequency of the pump to 0.8 x 360 = 288 spm by
pushing the UP or DOWN arrow keys.
B. EH Pumps using the ‘R’ Control Module
The pump will operate best with the stroke length at 100%. If less than full
output is required, set the frequency to the approximate percentage of maximum
desired.
Example: Model EHB20R1-VC has maximum output of 1.5 GPH.
Desired output is 1.2 GPH. 1.2 ÷ 1.5 = 0.8 or 80%
Set the frequency knob at 80.
For outputs less than 2% of maximum it will be necessary to also reduce the
stroke length. (Minimum recommended stroke length is 40%.)
C. EH Pumps using the ‘Y’ Control Module
The pump will operate best with the stroke length at 100%. If less than full
output is required, set the frequency to the desired strokes per minute using the
UP and DOWN arrow keys.
Example: Model EHB20Y1-VC has maximum output of 1.5 GPH.
Desired output is 1.2 GPH. 1.2 ÷ 1.5 = 0.8 or 80%
Set frequency of the pump to 0.8 x 360 = 288 spm by pushing the UP
or DOWN arrow keys.
For very low outputs it will be necessary to also reduce the stroke length.
(Minimum recommended stroke length is 40%.)

14
3.3 Calibration
If exact output calibration is required, first prime and
adjust the pump as above. Then connect a calibration
column to the suction side of the pump. Turn the pump
on for one minute and read the amount of liquid pumped
from the column. Adjust the frequency up or down as
necessary and check the output again. When the desired
output is reached, disconnect the calibration column and
reconnect the suction tubing. (See Figure 8.) Calibration
must be performed with application equivalent back
pressure for accurate results.
3.4 External Control
(Not available on EZ pumps)
A. Pumps using the ‘R’ Control Module
For pulse proportional external control of pump frequency, connect the control
signal leads to terminals 4 (positive) and 6 (common) inside the control module.
The input signal should not exceed 360 pulses per minute. The control signal
can be a contact closure type switch or solid state device, however the external
circuit should be capable of switching 10 VDC at 2 mA with a pulse width of 10
ms to 100 ms. (See Figure 9.) Do not use a powered control signal.
In order for the pump to operate properly in External Mode, the frequency knob
must be set fully counter clockwise so it points to the “E”. (See Figure 10.)
23 456
GROUND POWER
SUPPLY
EXTERNAL
SIGNAL INPUT
TERMINALS
STOP
FUNCTION
TERMINAL
S
Hot
Neutral
+
(EXT)
+
(STOP)
Common
Figure 9 Figure 10
100%
STROKE RATE
90
70
50
30
10
E
Fi
g
ure 8 Calibration

15
B. Pumps using the ‘Y’ Control Module
The EH-Y Series is able to operate in both digital and analog external modes. An
external stop function is also available.
Display/Keypad Overview
Figure 11 Input Wiring.
Alpha/numeric display. Indicates
stroke frequency, external mode or
external settings.
Start/Stop key.
Manually starts or
stops the pump. This
key is used in setting
external modes and
values.
EXT key. Push to set
pump for external input
operation. This key is also
used to select external
mode and settings.
WAIT indicator.
Visible when pump is
in standb
y
mode.
EXT indicator.
Visible when pump
is operating via
external input.
STOP indicator. Visible
when the pump is stopped
via external signal. The
pump stops pumping.
OVER indicator. Visible
when an input signal
exceeds the pump’s 360
spm capability or when an
input signal is received
during an external 'Stop'.
SET indicator. Visible
when pump external mode
and/or setting are being
selected.
UP key. Increases
numeric values. Is used
with EXT key to select
external modes.
DOWN key. Decreases
numeric values. Is used
with EXT key to select
external settings.
ON light. Indicates AC
power to the pump and
goes on and off with
each stroke.
3 6 0
EH Controller
1
2
WAIT EXT STOP OVER SET
START/STOP
ON
EXT
4
23 5678
PowerGround
Stop Input
Digital Input
Analog Input
Sensor Power
DC 12V
2
0
mA max.
+
+
-
-
White
NEU
Black
HOT
Green

16
EH-Y Quick Reference Guide
S/S EXT
FROM: PRESS: TO:
Start/Stop Key External Key
WAIT
MODE
S/S
EXT
EXT
+
EXT
+
Run in manual mode
Run in ternal mode
EXT
SET
SET
external mode
external values
S/S
Decrease frequency (1 to 360 SPM)
Increase frequency (1 to 360 SPM)
S/S
Return to and stop pump operation
WAIT
RUNNING IN
MANUAL MODE
EXT
RUNNING IN MODE
SET
EXTERNAL MODE
OR Toggles between DIG (multiply or divide) and
ANA (milliamp input)
S/S
A
ccept data and return to mode WAIT
Return to and stop pump operation WAIT
Decrease frequency (1 to 360 SPM)
Increase frequency (1 to 360 SPM)
SET
EXTERNAL VALUES
DIG
EXT
S/S
S/S
ANA
Select '/' (divide) or 'X' (multiply
Increase value (1 to 999)
Decrease value (1 to 999)
A
ccept data and return to mode
WAIT
EXT
Scroll through the following selections:
A
ccept data and return to mode WAIT
A
P
A
P
nalog signal level (point 1)
ump speed (point 1)
nalog signal level (point 2)
ump speed (point 2)
Increase value (A from 0.00 to 20.0mA)
(P from 0 to 360 SPM)
Decrease value (A and P)
Indicates the external stop function has been activated
Indicates one or more input pulses were received prior to completing
action required by previous input pulse.
WAIT
Increase Decrease
Pump Speed
RUN
MANUAL
RUN
EXTERNAL
SET EXTERNAL
MODE
SET EXTERNAL
VALUES
S/S S/S S/S S/S S/S
Incr Decr
Pump Speed
DIG ANA
DIG: ANA:
toggles
between
X, /
to scroll thru
A
1, P1, A2, P
2
Incr Decr
Numeric Value
EXT EXT EXT
EXT EXT

17
Pump #5 MAXPump #1 Pump #2
GND
+
GND
+
GND
+
Open Collector (reed switch) or
Opto-Isolator
4
5
6
4
5
6
4
5
6
Digital Mode
In digital mode, the pump accepts a non-powered pulse signal (contact closure
type or solid state device) from a flowmeter or other instrument. The pump can
be set to divide pulses by a factor of 1 to 999; or in multiply mode, 1 input pulse
can produce 1 to 999 pump strokes. The minimum pulse width on the Y control
module is 50 msec.
Connecting a digital input device
Disconnect AC power to the pump. Remove the four screws from the terminal
block cover and remove the cover. Remove the cord nut and bushing from the
terminal block cover. Remove the terminal block from the connector. Slide the
nut and bushing over the external control cable and insert the cable through the
terminal block cover. Strip 1/4” insulation from conductors and connect the
positive side to terminal 6 and the negative side to terminal 8. (See schematic,
below.)
Connecting EH-R Pumps in Parallel for Pulse Control
NOTES:
CAUTION: DO NOT SUPPLY ANY TYPE OF POWERED INPUT TO THE
PUMPS!
Polarity Sensitive. Be sure to connect the POSITIVE to POSITIVE and GND to GND with each
connection. ONLY a contact closure is acceptable or damage to the pumps will occur.
Maximum current rating of the pump input is 10mA. Each pump draws approximately 2mA.
There is a 5 PUMP LIMIT of pumps in parallel.
Make sure the switching device can handle the maximum current in the system.
4
2 3
5 6 7 8
Power Ground
Digital Input
Sensor Power
DC 12V
20 mA max.
+-
White
NEU
Black
HOT
Green