Sheldon Watlow EZ-Zone Programming Manual

Profile Programing Guide

Watlow Controller

Watlow EZ-Zone for Sheldon Ovens

Watlow EZ-Zone Controller – Ovens

Sheldon Manufacturing
300 N. 26th Ave
Cornelius, OR 97113
EMAIL: [e-mail]
PHONE [phone]
[phone]

WATLOW PROGRAMING GUIDE

Last Revised: March 11, 2014
Part Number (Guide): 9920715

PURPOSE

This guide describes how to program and launch heating profiles in the Watlow EZ-Zone
Temperature Controller, when installed in Sheldon Manufacturing ovens. It is a simplified
alternative to Chapter 7 of the controller’s factory-provided manual, and explains the most
commonly used programing options.

INTRODUCTION

The Watlow EZ-Zone Controller can hold up to four heating (4) profiles, each with ten (10)
sequential steps. Each step can be used to initiate one of three commonly used options:

 Timed Interval. Heating or cooling the oven.
 Soak. Constant temperature period.
 End. Concludes a running profile.

Each option includes parameters that can be set by the user. For example, the Soak option comes
with time duration parameters for hours, minutes, and seconds.

All steps are stored sequentially in the controller’s long-term memory.

 Profile 1: steps 1 -10
 Profile 2: steps 11 – 20
 Profile 3: steps 21 – 30
 Profile 4: steps 31 - 40

Steps and heating profiles will remained stored when the oven is turned off or experiences a power
outage. In the event of a power interruption while running a profile, the oven will restart if the Power
Switch is in the On position, but it will not automatically resume the profile. An interrupted profile
must be re-launched by the user.

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TABLE OF CONTENTS

Purpose ..................................................................................................................................................... 2

Introduction ................................................................................................................................................ 2

Main Temperature Control ........................................................................................................................ 4

Commonly Used Profile Step Options....................................................................................................... 5

Powering the External Outlet .................................................................................................................... 5

Programing a Simple Heating Profile ........................................................................................................ 6

Programing Profiles 2 - 4 ........................................................................................................................ 13

Launching Profiles ................................................................................................................................... 14

Combining Profiles .................................................................................................................................. 15

Aborting a Running Profile ...................................................................................................................... 15

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20.0

20.0

RESE T

EZ1

EZ2

2

C

CURRENT OVEN CHAMBER

TEMPERATURE

TEMPERATURE SET

POINT (YOUR DESIRED

TEMPERATURE)

NUMBERS INDICATE

COMMUNICATION FUNCTIONS

RAMPING SYMBOL INDICATES

THAT A HEATING PROFILE IS

RUNNING

THE ADVANCE BUTTON SCROLLS

THROUGH MENUS AND

PARAMETER LISTS

THE DOWN ARROW BUTTON

ADJUSTS SET POINTS OR

CHANGES PARAMETERS

THE UP ARROW BUTTON

ADJUSTS SET POINTS

OR CHANGES PARAMETERS

THE RESET BUTTON
MOVES 1 PAGE BACK
OR RETURNS TO THE

HOME PAGE

THE EZ1 BUTTON

INITIATES AND ABORTS

HEATING PROFILE 1

Watlow Controller Details

WATLOW PROGRAMING GUIDE

MAIN TEMPERATURE CONTROL

The Watlow EZ-Zone Controller is used as the main temperature controller and display on several
Sheldon Manufacturing ovens, and is labeled SET TEMPERATURE. The controller has a digital
display, and Up / Down Arrow buttons used for adjusting the oven’s temperature set point and for
selecting menu options. On some ovens models the arrows are also used for setting the Over
Temperature Limit setting.

The EZ1 button is a shortcut button to launch heating Profile 1. It can also be used to manually
abort a running profile.

The green Advance Button advances the display through pages and option lists.

The RESET Button is used to move the display back to previous pages when programing heating

profiles, and to return to the Home Page. The Reset Button is labeled with an infinity ∞ symbol on
older Watlows.

Note: The EZ2 Button does not have a function in Sheldon Manufacturing ovens.

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Option

Display Code

Function

Ramp Up / Ramp

Down

(Timed Interval)

Ti

The Timed Interval step option is used for ramping up or
ramping down the oven’s temperature over a user-selected
time interval. Note: Use of this option must take into account

the oven’s maximum heating and cooling rates, which can vary

with environmental conditions of your shop, production space,
or laboratory.

Soak

SoAh

The Soak option runs the oven at a constant temperature for a
duration programed using the option’s minute, hour, and
second parameter settings.

End Profile

End

The End option ends a running profile when that step is
reached. If the End option is not chosen, a running profile will

advance to the next programed step stored in the controller’s

memory.

The User “USEr” parameter choice for End restores the oven to
the user’s manual control, and returns the oven to its pre-profile
heating state.

WATLOW PROGRAMING GUIDE

COMMONLY USED PROFILE STEP OPTIONS

POWERING THE EXTERNAL OUTLET

This section does not apply to vacuum ovens.
Some forced air and convection ovens are provided with an external electrical outlet for powering

an accessory exhaust blower fan. Watlows for these ovens include an Event 1 parameter for each
step option. Switching this parameter from Off to On will trigger the power up of the oven’s external
power outlet, and any equipment attached to it, when the step is reached during a profile. Switching
to parameter to Off depowers the outlet, when the step is reached.

By default the Event 1 parameter is set to Off. It must be switched to On for each successive step
that you want it to run during the execution of the profile.

As of the current printing of this guide, the following ovens can use the Event 1 parameter to power
an external exhaust blower: SMO5HP-2, SMO10HP-2, SMO14HP-2, SMO34HP-2, SMO38HP-2,
and SMO5CR-2

The units previously designated as: HF4-2, HF10-2, HF15-2, HF25-2, HF37-2, and CR1-2

Note: The Event 2 parameter is not associated with an output or a function for Sheldon ovens.

Always leave Event 2 set to Off.

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