Walchem EZ Series User manual

EZ Series
Electronic Metering Pump
Instruction Manual
Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA
TEL: [phone] FAX: [phone] WEB: www.walchem.com
W A L C H E M
IWAKI America Inc.
EZ Series Metering Pumps

Notice
© 2014 WALCHEM, Iwaki America Inc. (hereinafter “Walchem”)
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. 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.
This document is for information purposes only and is subject to change without notice.
Statement of Limited Warranty
WALCHEM 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 and for the
purposes disclosed in writing at the time purchased, if any. WALCHEM’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, transportation charges prepaid,
has been inspected and determined by WALCHEM 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 E00159.H
Nov 2014

TABLE OF CONTENTS
Thank you for choosing a Walchem EZ Series metering pump. This instruction manual deals
with the correct installation, operation, maintenance and troubleshooting procedures for the EZ
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 ............................................................................................................ 5
2.1 Unpacking ................................................................................................................. 5
2.2 Location ..................................................................................................................... 5
2.3 Supply Tubing............................................................................................................ 6
2.4 Discharge Tubing ...................................................................................................... 7
2.5 Installing Injection/BackPressure Valve ..................................................................... 7
2.6 Interlocking Pump ...................................................................................................... 8
2.7 Electrical .................................................................................................................... 8
3.0 OPERATION ................................................................................................................. 9
3.1 Priming ...................................................................................................................... 9
3.2 Adjustment and Control ............................................................................................. 9
3.3 Calibration ............................................................................................................... 13
3.4 STOP Function ........................................................................................................ 13
3.5 AC Power Interruption ............................................................................................. 13
3.6Auto Air Vent Valve Operation ................................................................................. 14
3.7 MultiFunction Valve Operation ................................................................................. 15
4.0 MAINTENANCE .......................................................................................................... 16
4.1 Diaphragm Replacement ......................................................................................... 16
4.2Valve Replacement ................................................................................................. 16
4.3 Tubing ..................................................................................................................... 16
5.0 EXPLODED VIEW & PARTS GUIDE .......................................................................... 17
6.0 TROUBLESHOOTING ................................................................................................ 27
7.0 SERVICE POLICY ...................................................................................................... 27

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 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). Pumps should always be shielded from
direct exposure to the elements. Black UV resistant tubing should be used if the tubing is
exposed to strong UV radiation (sunlight/lamps).
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.
In flooded suction, pumping downhill, or pumping into little or no system pressure installations,
a back pressure/anti-syphon device must be installed to prevent over-pumping or siphoning.
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 acids or alkalines) 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 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
EZ B16 D 1 - VC A
1 2 3 4 5 6
1 Pump Series
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
T Timer module allows daily, weekly, or 2 week operation with digitally
adjustable speed and external stop control. Available on 115V EZB models.
4 Voltage
1 115 VAC, 50/60 Hz
2 230 VAC, 50/60 Hz
5 Liquid End (See Section 1.4 for detailed chart.)
6 Options
M Multifunction Valve is supplied in place of the manual air vent valve. Available
for the EZ series pumps with VC, VE, VF, PC and PE liquid ends. Not available
with the AAVV feature.
A Auto Air Vent Valve supplied in place of manual air vent valve.
Available for the EZ Series in B11, B16, C16 and C21 sizes with –VC liquid
ends only.

3
1.4 Specifications
Electrical 50/60 Hz, single phase
EZB 115 VAC±10% 0.9 Amp max. 16 watt avg.
230 VAC±10% 0.4 Amp max. 16 watt avg.
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
Size
Maximum
Output Capacity
Max Output per
Stroke (mL)
Maximum
Pressure
1
Connection
Size (in)
Tubing O.D
(Gal/hr)
(mL/min)
PSI
MPa
B11
0.6
38
0.11
150
1.0
3/8
B16
1.0
65
0.18
105
0.7
3/8
B21
1.5
95
0.26
60
0.4
3/8
B31
3.2
200
0.56
30
0.2
1/2
C16
1.3
80
0.22
150
1.0
3/8
C21
2.0
130
0.36
105
0.7
3/8
C31
4.3
270
0.75
50
0.35
1/2
C36
6.3
400
1.17
30
0.2
1/2
1 Auto Air vent valve reduces maximum pressure approx. 35 PSI (0.2 MPa)
Adjustment Range
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
PTFE
(bonded to
EPDM)
CE
FKM
FKM
PTFE PE
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
CE Alumina ceramic PE Polyethylene
EPDM Ethylene propylene diene monomer PTFE Polytetrafluoroethylene
FKM Fluoroelastomer PVC Polyvinylchloride (translucent)
GFRPP Glass fiber reinforced polypropylene PVDF Polyvinylidenefluoride
PCTFE Polychlorotrifluoroethylene

4
1.5 Dimensions
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
EZB
11
16
21
D1
D2
-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
-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
31
-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
-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
EZC
16
21
D1
D2
-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
-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
31
36
-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
-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
C
B
P
X
Z
R
S
T
V
L
E
A
Q
F
J
W
H
G
D

5
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, vibration-free, 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). Pumps should always be shielded from direct exposure to the elements. Black UV
resistant tubing should be used if the tubing is exposed to strong UV radiation (sunlight/lamps).
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.)
Figure 1 Figure 2 Figure 3
Flooded Suction Shelf Mount Tank Mount
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).

6
Figure 4 Tubing Connections
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. Ensure
that siphoning through the pump will not occur when the pump is not in operation. If possible,
install a back pressure/anti-siphon valve in the discharge line of the pump. 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.
Foot Valve
PVC Pipe Tubing Straightener
(user supplied)
Air Gap
Return Line
Point of
Injection
Injection
Valve
Coupling Nut
Coupling Nut
(Air Vent Valve)
Coupling Nut
Valve
Housing
Shoulder
Coupling Nut
Tubing
Figure 5

7
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 (31 & 36 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. 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.
"AIR"
"OUT"
Drains back to tank
Discharges to injection point

8
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 Interlocking Pump
CAUTION! Control of pump operation is critical. Operation and chemical addition during no
flow situations can create hazardous situations from elevated chemical concentrations and
chemical gasses trapped in the line.
Ensure that during no flow conditions such as when the well pump, main line or recirculation
pump is off, and for pools/spas, in times of backwash, that the metering pump is not allowed to
operate. If using a controller (pH/ORP/pool) for automated control and flow indication is tied
into it, pump operation can be interlocked to the controller.
Interlocking the pump operation can also be done directly using a flow switch located in the
water, main or pool/spa recirculation lines. The flow switch can be tied directly into the pumps
to stop operation during no flow conditions.
2.7 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.
CAUTION! The electronics within the pump can be damaged by excessive surges in voltage.
Do not install the pump near high-power electrical equipment that generate high surge voltages.
Avoid branch circuits that also supply power to heavy or other equipment that could generate
electrical interference. If necessary, install a surge suppression device (such as a varistor with a
resistance greater than 2000A) or a noise reducing transformer at the pump’s power connection.
Trim back as needed
to fit tee or fitting
Injection/Back Pressure Valve

9
3.0 OPERATION
3.1 Priming
Install the pump as described above. With the pump turned on, set 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. 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: It is recommended that pumps with FC liquid ends use flooded suction when priming, due
to the hard valve seat material.
3.2 Adjustment and Control
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 EZB21D1-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.

10
B. EZ Pumps using the ‘T’ Control Module
The EZB-Timer Series is able to operate in Daily, Weekly and 2-Week modes. An external stop
input and 12VDC output are also available.
Display/Keypad Overview
Figure 8
Alpha/numeric display. Indicates
WAIT mode, stroke frequency,
time or pump on-time.
MODE key. Scrolls user
through TIMER, WAIT
and MAN modes. Use
to exit from any
programming mode.
SEL key. Manually starts or
stops the pump from WAIT
mode. Used to select
program number or day of
week while programming.
NUM/DAY indicator.
Becomes backlit when
programming or
operating at programmed
number/day.
NUM indicator. Becomes
backlit when the pump is in
DAILY mode to indicate the
timer program number.
SET indicator. Becomes
backlit when pump is
being programmed.
2nd indicator. Becomes
backlit when pump is in
the 2nd week of the 2-
WEEK mode.
UP/HOUR key.
Increases numeric
values and sets the
hours. Used with SEL
key to set pump on-
time and duration.
DOWN/MIN key. Decreases
numeric values and sets the
minutes. Used with SEL key
to select the Timer Pump
Mode.
ON light. Indicates AC
power to the pump with
continuous green.
Flashes off with each
stroke.
P 3 6 0
EH-T Controller
5.THU
6.FRI
7.SAT
8.STOP
2nd
ON
SEL
1.SUN
2.MON
3.TUE
4.WED
SET
ON
Num
MODE
HOUR
MIN
4
2
3
5
6
7
8
Power
Ground
Stop Input
Sensor Power
DC 12V
20 mA max.
+
_
White
NEU
Black
HOT
Green

11
EZ-T Quick Reference Guide
FROM:
PRESS:
TO:
Mode Key
Select Key
WAIT
MENU
+
+
Move to MANUAL menu
Changes pump frequency (1 to 360 SPM)
Starts and stops manual operation
OR
Sets the Hour (incrementing only)
(Hold for 3 seconds)
MODE
SEL
MODE
SEL
SEL
SEL
MIN
HOUR
Move to TIME / DATE setting menu
Move to TIMER programming menu
Move to TIMER MODE selection menu
MANUAL
MENU
MIN
HOUR
SEL
TIME / DATE
MENU
(24 Hour Clock)
MIN
HOUR
SEL
Sets the Minutes (incrementing only)
Selects the Day of the week
MODE
MODE
Move to TIMER RUN mode (shows TIME)
Exits back to WAIT menu
Move to WAIT menu
MODE
TIMER RUN MENU
Scrolls between DAILY, WEEK or 2-WEEK
Timer modes
TIMER MODE MENU
MIN
HOUR
MODE
Exits back to WAIT menu
OR
TIMER
PROGRAMMING
MENU
Sets the Hour / Sets On-Time Minutes
MIN
HOUR
SEL
Sets the Minutes / Sets On-Time Minutes
Scrolls through the week days / program #
MODE
Exits back to WAIT menu
WAIT
MANUAL
TIMER RUN
POWER ON
TIMER MODE
SELECTION
TIMER
PROGRAMMING
MODE
MODE
HOUR
SEL
+
MIN
SEL
+
MODE
MODE
MODE
TIME / DATE
SETTING
SEL
(3 Seconds)
MODE

12
Programming and Timer Use
CAUTION! Before use, check the time and date. Set to the local time and date before
programming. Incorrect time/date can result in incorrect operation.
1. Manual Operation
From the WAIT menu, pressing the MODE key will enter the manual mode. Pressing SEL will
toggle the pump on and off manually. The speed can be changed with the UP and DOWN
arrows both running and waiting. NOTE: The pump speed set in this menu will be the speed
that the pump will run during timed operations.
2. Time/Date Setting
From the WAIT menu, holding the SEL key down for 3 seconds will enter into the Time/Date
SET menu. Using the HOUR and MIN keys, the time can be set using a 24-hour clock. The
SEL key will cycle through the days of the week.
Once the correct time and day of the week are set, pressing the MODE key will go back to the
WAIT menu.
3. Timer Mode Selection
Pressing the MIN and SEL keys at the same time will bring up the Mode Selection menu. This
menu is where the Timer module is set to control in daily, weekly, or in 2-week modes. Use the
UP and DOWN keys to cycle through the three options and MODE to get back to the WAIT
menu. Daily mode allows a max of up to 8 timed operations repeated every day. Weekly and 2-
week modes allow a max of one timed operation per day.
4. Timer Operation Programming
Pressing the HOUR and SEL keys at the same time will bring up the Timer Programming menu.
This menu is where the individual operations are set – both start time and run time.
DAILY MODE:
Initially, the 1-SUN and NUM will both be backlit. NUM is backlit to signal that the number backlit
is used – i.e. program 1 in this case. Using the HOUR and MIN keys, the time for the first program
can be set (24-hour clock). Pressing the SEL key will change the menu to program the on-time to
run the pump (initially shows “ 0M”). Use the UP and DOWN keys to program the # of minutes for
the pump to run. Pressing SEL again will then move to program the second program and the
backlight will move from 1-SUN to 2-MON. The clock and on-time settings are set in the same
manner. Pressing MODE will go back to the WAIT menu.
WEEKLY MODE:
Initially, the 1-SUN will be backlit signifying that Sunday is being programmed. If a program is
desired for Sunday, use the HOUR and MIN keys to set the time of the program. If no program is
desired for Sunday, pressing the SEL key will scroll through each day’s two programmed settings –
the time to start and the run time. Pressing MODE will go back to the WAIT menu at any point in
the programming.
2-WEEK MODE:
Two week mode is similar and set just as the weekly mode, only after the first 7-SAT is
programmed or passed by and 1-SUN is again backlit, the “2nd” will also become backlit showing
that the day is in
the 2nd week. All programming functions are the same and SEL will scroll through each setting.
Pressing MODE will go back to the WAIT menu at any point in the programming.
From the WAIT mode, pressing MODE will move to the MANUAL menu. Check to make sure
that the pump speed is set at the rate desired during the timed operations. If not, use the UP and
DOWN keys to change the pump speed.

13
Pressing MODE again will display the current time and date. The pump is now operating in the
TIMER mode and will come on at the next programmed timer operation.
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 9) Calibration must be performed with application
equivalent back pressure for accurate results.
3.4 STOP Function
Additionally, EZ pumps with a Timer Module can be controlled in start-stop mode. In this
mode, AC power is applied continuously and pump operation is stopped by completing the
circuit between the positive ‘stop’ and common terminals inside the T Control Module: 7
(positive) and 8 (common). A switch or solid state device capable of switching 5VDC at 2 mA
should be used. Switch closed = pump stopped, switch open = pump running at the speed
determined by the frequency setting. This feature eliminates the need for a high voltage, high
current AC relay to start and stop the pump. (See Figure 8)
3.5 AC Power Interruption
If AC power is interrupted, the pump will power up as shown below:
State preceding power OFF State following power ON
WAIT WAIT
Running in Manual Operation Running in Manual Operation
Running in Timer Operation Running in Timer Operation
Setting Time WAIT
Programming Timer Set points WAIT
Figure 9 Calibration

14
3.6 Auto Air Vent Valve Operation
The Auto Air Vent Valve is an option on select EZ pumps and replaces the standard Manual Air
Vent Valve when ordered. It is used primarily in applications where gassing is a problem and
pumps can lose prime.
Unlike the Manual Air Vent Valve, the Auto Air Vent Valve constantly bleeds a controlled
amount of volume out of the “Air” vent. Therefore, the “Air” vent should always be plumbed
back to the source tank. During priming, the access knob does not have to be loosened as with a
manual air vent valve as pressure is relieved through the vent. The Top Valve Guide assembly
uses a bottom seat to ensure that air is not introduced into the discharge media and utilizes a
precisely machined top seat that allows air to be quickly purged but limits the amount of liquid
returned to the tank. A sleeve valve is used to maintain backpressure within the pump head,
which helps speed the purging of air.
AAVV – Cross Sectional
View
Discharge to Process
Sleeve
Valve
Suction
Gas Vent Top Check Ball
and Seats
Access Knob

15
3.7 MultiFunction Valve Operation
The MultiFunction Valve is optional on select EZ pumps and replaces the standard Manual Air
Vent Valve when ordered. It integrates the air venting/bleeding functions with a back pressure
and anti-siphon valve.
Air Vent / Bleed Function
1. Open the air vent by turning the air
vent adjustment knob counter-
clockwise one to one and a half turns.
2. Operate the pump until all of the air
is purged and only liquid is
discharged from the air vent drain.
3. Turn the air vent adjustment knob
clockwise until it bottoms out and
will not turn further.
Back Pressure / Anti-Siphon Valve
1. A spring-loaded diaphragm
automatically adds 30PSI of back
pressure to the discharge side of the
pump when the air vent adjustment
knob is closed.
2. If back pressure is not observed, the
pressure release knob may be in the
release position (the knob is resting in
its ‘up’ location). If this is the case,
turn the knob clockwise until it
‘clicks’ down (approximately ¼
turn).
3. The diaphragm prevents siphoning of chemical through the pump.
Pressure Release
1. Stop the pump operation.
2. Turn the pressure release knob clockwise until it ‘clicks’ into the release or ‘up’ location
(approximately ¼ turn). If the knob is turned too far, it will ‘click’ again return to the back
pressure or ‘down’ position. If this happens, keep turning the knob clockwise until it ‘clicks’
one time in the release (‘up’) position. Note: To avoid damage, do not turn the knob counter-
clockwise.
3. Turn the air vent adjustment knob counter-clockwise one or one and a half turns to release
the pressure in the discharge tubing/piping through the air vent drain. The air vent drain
should always be plumbed back to the supply tank or to safe disposal. Do not submerge the
air vent drain tubing under chemical in the supply tank.
CAUTION: Confirm that liquid is discharged from the air vent drain. If the liquid is not
discharged, the pressure may not be released. If this is the case, repeat the Pressure
Release procedure.
Air Vent
adjustment
knob
Air Vent
drain

16
4.0 MAINTENANCE
4.1 Diaphragm Replacement
Disconnect AC power to the pump and disconnect the suction tubing, discharge tubing, and air
vent tubing. Remove the four head bolts with a 4mm hex wrench. Unscrew the diaphragm and
remove its retainer (small disk behind the diaphragm). CAUTION: There may be small brass
spacers between the retainer and the armature shaft. These spacers need to be reused when
replacing the diaphragm. Install the new retainer and diaphragm on the shaft. Turn the
diaphragm clockwise until it bottoms on the shaft. Use caution when handling the diaphragm –
the PTFE surface can be damaged by tools, nails or any sharp objects. Replace the pump head
and tighten the head bolts to a torque of 19 lb-in (2.16 N-m).
4.2 Valve Replacement
Remove the suction and discharge tubing making sure discharge side has been depressurized.
Remove the suction fitting, two valve cartridges, o-ring and gasket(s). Install the new o-ring,
gasket(s) and valve cartridges. Be sure both valve seats are in the same orientation. Refer to
Figure below. Tighten the suction fitting. Similarly remove and replace the discharge valve
cartridges, o-ring and gasket(s). For a more detailed drawing, refer to the Section 6.0.
4.3 Tubing
Check ends of tubing for splits, cracks, or thin spots. Examine the full length of tubing for
damage due to chafing, abrasion, stress cracks, excessive temperature or exposure to ultraviolet
light (direct sunlight or mercury vapor lamps). If any signs of deterioration exist, replace the
entire length of tubing. It is a good idea to replace discharge tubing on a regular preventive
maintenance schedule every 12 months.
CAUTION: Before working on the pump, disconnect the power cord, depressurize
the discharge tubing and drain or flush any residual liquid from the pump head and
valves. Always wear protective gear when working around chemicals.
FLOW
VALVE CARTRIDGE ORIENTATION
GASKET
VALVE GUIDE
BALL
VALVE SEAT
Valve Cartridge Orientation
CAUTION: There are many small
parts in the liquid end. These
parts must be installed correctly
for proper operation of the pump.

17
5.0 EXPLODED VIEW & PARTS GUIDE
PVC/GFRPP Liquid End Exploded View #1
For EZ pump model sizes 11, 16, and 21
4
23
26
25
14
11
13
12
11
13
12
19 17
8
1
17
14
11
13
12
11
13
12
3
4
ZZ
30
31
12
32
10
27
5
6
35
4
28
33
29
4
34
13
4 10
23
26
25
21
22
10
E
D
9
D
C Entire Head Assembly
D Valve Cartridge
E Air Vent Valve
Part numbers for these assemblies are
on Page 26
Manual Air
Vent Valve
(Standard)
Auto Air Vent
Valve
(Optional)
Item #1 EZ Heads (Qty 1)
Part No
Description
Size
Liquid End Mat’l
EH1947
ZB11 PVC
11
VC,VE,VF, VCA
EH1948
ZB16 PVC
16
VC,VE,VF, VCA
EH1949
ZB21 PVC
21
VC,VE,VF
EH1950
ZC16 PVC
16
VC,VE,VF, VCA
EH1951
ZC21 PVC
21
VC,VE,VF, VCA
EH1954
ZB11 GFRPP
11
PC,PE
EH1955
ZB16 GFRPP
16
PC,PE
EH1956
ZB21 GFRPP
21
PC,PE
EH1957
ZC16 GFRPP
16
PC,PE
EH1958
ZC21 GFRPP
21
PC,PE