Walchem EZ Operating Manual

IWAKI PUMPS

EZ Series Electronic Metering Pump
Instruction Manual

Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA

TEL: [phone] WEB: www.walchem.com

Notice

© 2017
Five Boynton Road, Holliston, MA 01746 USA
tel [phone] fax [phone]
All Rights Reserved
Printed in USA

WALCHEM, Iwaki America Inc. (hereinafter “Walchem”)

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 identication 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.N
January 2017

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.

Contents

1.0 INTRODUCTION ..................................................................................... 1

1.1 Safety and Caution Notes ................................................................................................................. 1

1.2 Principle of Operation ........................................................................................................................ 1

1.3 Model Code ....................................................................................................................................... 2

1.4 Specications .................................................................................................................................... 2

1.4.1 Electrical

1.4.2 Operating Conditions .............................................................................................................. 2

1.4.3 Capacity/Pressure Rating ....................................................................................................... 3

1.4.4 Adjustment Range ................................................................................................................... 3

1.4.5 Materials of Construction ........................................................................................................ 3

1.5 Dimensions ........................................................................................................................................ 4

.............................................................................................................................................. 2

2.0 INSTALLATION ....................................................................................... 6

2.1 Unpacking ......................................................................................................................................... 6

2.2 Location ............................................................................................................................................. 6

2.3 Supply Tubing .................................................................................................................................... 7

2.4 Discharge Tubing .............................................................................................................................. 8

2.5 Installing Injection/BackPressure Valve ............................................................................................. 8

2.6 Interlocking Pump .............................................................................................................................. 9

2.7 Electrical ............................................................................................................................................ 9

3.0 OPERATION ............................................................................................ 9

3.1 Priming .............................................................................................................................................. 9

3.2 Adjustment and Control ..................................................................................................................... 10

3.3 Calibration ......................................................................................................................................... 13

3.4 STOP Function .................................................................................................................................. 13

3.5 AC Power Interruption ....................................................................................................................... 13

3.6 Auto Air Vent Valve Operation ........................................................................................................... 14

3.7 MultiFunction Valve Operation .......................................................................................................... 14

4.0 MAINTENANCE ..................................................................................... 16

4.1 Diaphragm Replacement ................................................................................................................... 16

4.2 Valve Replacement ........................................................................................................................... 16

4.3 Tubing ............................................................................................................................................... 16

5.0 EXPLODED VIEW & PARTS GUIDE ......................................................17

6.0 TROUBLESHOOTING ............................................................................27

7.0 SERVICE POLICY ...................................................................................27

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 ttings 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 ooded 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 rell the

pump head.

1

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 xed 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 (not available on EZB pumps)

5 Liquid End (See Section 1.45 for detailed chart.)

6 Options

M: Multifunction Valve is supplied in place of the manual air vent valve. Available for the EZ

series pumps in all sizes and iquid ends except FC. Not available with the ADV feature.

A Auto Degassing Valve is supplied under the manual air vent valve. Available for the EZ Series
in B11/16/21 and C16/21 sizes with –VC/-VE liquid ends only.

1.4 Specications

1.4.1 Electrical

(50/60 Hz, single phase)

EZB 115 VAC±10% 0.9 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.

1.4.2 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

2

1.4.3 Capacity/Pressure Rating

Size Maximum

Output Capacity

(Gal/hr) (mL/min) PSI MPa

Max Output per

Stroke (mL)

Maximum

Pressure

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 Degassing valve reduces output by approx. 20%

1.4.4 Adjustment Range

Frequency adjustment range: 0 to 360 strokes per minute

1.4.5 Materials of Construction

1

Size (in)

Tubing O.D

Connection

Liquid

End

Code

PA GFRPP

Pump

Head

& Fittings

Diaphragm

Valve

Balls

Valve

Seat

Valve

Seals

CE PCTFE AFLAS

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

TA PVDF CE PCTFE AFLAS

PTFE

(bonded to

EPDM)

PTFE PE

®

TC PVDF CE FKM FKM

FC PVDF CE PCTFE PTFE

CE Alumina ceramic PE Polyethylene

EPDM Ethylene propylene diene monomer PTFE Polytetrauoroethylene
FKM Fluoroelastomer PVC Polyvinylchloride (translucent)
GFRPP Glass ber reinforced polypropylene PVDF Polyvinylideneuoride
PCTFE Polychlorotriuoroethylene

3

1.5 Dimensions

EZB Models with thermoplastic liquid end materials (except -FC)

7.95” (See Note 1)

1.85”

Tubing (ID x OD)

ø1/4” x ø3/8”

Tubing (ID x OD)

ø1/4” x ø3/8”

Z (See Note 3)

Y (See Note 2)

3.54”

Notes:

0.08”

0.28”

3.46”

0.63”

0.39”

3.21”

1.26”

(0.98”)

Tubing (ID x OD)

0.24”

ø1/4” x ø3/8”

0.20”

3.94”

Model Size X Y Z

11-21 0.54" 6.1" 7.47"

31 -0.15" 6.57" 7.91"

X

1. Addition of a Multifunction valve increases overall length by 0.10”.

2. Addition of a Multifunction Valve increases discharge height by 2.62”. The Auto Degassing Valve increases discharge height by 1.82”.

3. Addition of a Multifunction Valve increases overall liquid end height by 1.25”. The Auto Degassing Valve increases height by 1.82”

EZB Models with FC liquid end materials

L

E

1/4” FNPT

ø3/8 OD Fittings

supplied

0.08” (0.98”)

3.46”

0.28”

0.63”

3.21”

1.26”

1/4” FNPT

ø3/8 OD Fittings

supplied

0.24”

4

6.83”

Y

3.54”

0.20”

X

3.94”

Model Size X Y L E

11-21 1.20” 5.90” 6.57” 0.51”

31 0.55” 6.54” 6.81” 0.63”

EZC Models with thermoplastic liquid end materials (except FC)

0.28”

0.28”

8.66” (See Note 1)

1.85”

Tubing (ID x OD)

ø1/4” x ø3/8”

Tubing (ID x OD)

ø1/4” x ø3/8”

3.94”

Y (See Note 2)

Z (See Note 3)

4.13”

(1.06”)

Tubing (ID x OD)

ø1/4” x ø3/8”

0.31”

4.57”

X

Model Size X Y Z

3.94”

16-21 0.94" 6.46" 7.83"

31-36 0.24" 6.95" 8.33"

0.59” 1.18”

0.59”

0.59”

0.59”

Notes:

1. Addition of a Multifunction valve increases overall length by 0.10”.

2. Addition of a Multifunction Valve increases discharge height by 2.62”. The Auto Degassing Valve increases discharge height by 1.82”.

3. Addition of a Multifunction Valve increases overall liquid end height by 1.25”. The Auto Degassing Valve increases height by 1.82”

EZC Models with FC liquid end materials

L

E

1/4” FNPT

ø3/8 OD Fittings

supplied

3.94”

0.59” 1.18”

4.13”

0.59”

0.59”

0.59”

(1.06”)

1/4” FNPT

ø3/8 OD Fittings

supplied

5

Y (See Note 2)

Z (See Note 3)

3.94”

X

0.31”

4.57”

Model Size X Y L E

16-21 1.57” 6.31” 7.32” 0.51”

31-36 0.91” 6.97” 7.44” 0.63”

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 ttings 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 Flooded suction

Recommended for liquids

that out-gas

Figure 2 Shelf mount Figure 3 Tank mount

If ooded 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

Coupling Nut

(Air Vent Valve)

Injection
Valve

Point of
Injection

Coupling Nut

Return Line

Air Gap

PVC Pipe Tubing Straightener
(user supplied)

or
Ceramic weight

Coupling Nut

Foot Valve

Figure 4 Connection Tubing

2.3 Supply Tubing

The supply tubing run should be as short as possible. For ooded 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 tting. 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 rst, then the tubing clamp onto the tubing.

Push the tubing over the tubing adapter 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 are out more easily. Push the tubing
adapter into the tting on the pump and 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.

Fitting
on pump

Coupling

Nut

Tubing

Figure 5

Tubing
adapter

WARNING: All ttings and coupling nuts should be tightened by hand only. If necessary, a small tool may

Slide
tubing
down

Tubing clamp

be used to make it snug. DO NOT use excessive force or large wrenches.

The coupling nut should not bottom out completely against the tting. If this happens during connection, check the

tubing and tubing clamp connection. Remove the coupling nut, re-cut the tubing and re-connect if necessary.

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 be cut off under pressure.

7