Stulz E2 Series User manual

E2Series
Microprocessor Controller
For STULZ Perimeter
Precision Air Conditioners
Operation Manual

Notice
This document contains information protected by copyright. All rights are reserved. The owner of the equipment for which
this manual is written may photocopy the contents of this manual for internal use only. No part of this document may be
photocopied, reproduced, or translated into another language for use by anyone other than the owner of the equipment
for which this manual is written without the prior written consent of STULZ Air Technology Systems, Inc. (STULZ).
This document contains confidential and proprietary information of STULZ Air Technology Systems, Inc. Distributing or
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Unpublished rights reserved under the copyright laws of the United States and of other countries.
Other brands and trade names are trademarks of their respective owners.
© 2017 by STULZ Air Technology Systems, Inc.
Printed in the United States of America.
All rights reserved.
STULZ Air Technology Systems, Inc.
1572 Tilco Drive
Frederick, MD 21704
USA
QUICK START
INSTRUCTIONS
FOR INITIAL START-UP,
SEE SECTION 3.3.

STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
iii
Contents
1.0 GENERAL INFORMATION ................................... 1
1.1 Forward................................................................................1
1.2 Safety Summary................................................................1
1.3 Warnings and Cautions ..................................................1
2.0 DESCRIPTION ..................................................... 2
2.1 General.................................................................................2
2.2 Features...............................................................................2
2.2.1 Field Configurable............................................................2
2.2.2 Password Protection.......................................................2
2.2.3 Restorable Setpoint Parameters ................................2
2.2.4 Weekly Timer Feature.....................................................2
2.2.5 A/C Grouping pLAN Operation...................................2
2.2.6 BMS Interface ...................................................................3
2.3 User Interface Terminals................................................3
2.3.1 Graphic Terminal...............................................................3
2.3.1.1 Function Keys....................................................................3
2.3.1.2 Alarms ..................................................................................3
2.3.1.3 Contrast Adjustment .......................................................3
2.3.2 Large Bezel Terminal.......................................................4
2.3.3 Large Bezel Touch Screen Terminal...........................4
2.4 Controller Models.............................................................4
2.4.1 GEN1 Controller Layout ................................................4
2.4.2 GEN2 Controller Layout ................................................4
2.4.3 Expansion I/O Modules..................................................5
2.4.4 Constant Contact UPS Module...................................5
2.4.5 EVD Module .......................................................................5
3.0 Startup ................................................................ 6
3.1 Navigating Controller Screens.....................................6
3.1.1 Menu Selection .................................................................6
3.1.2 Menus...................................................................................6
3.1.3 Display Variables...............................................................7
3.1.4 Cursor Position in Screens............................................7
3.1.5 Modifiable Variables........................................................7
3.2 Password Authorization Levels ...................................7
3.2.1 Password Protected Screens ......................................7
3.2.2 Wrong Password ..............................................................8
3.2.3 Setting the Passwords....................................................8
3.3 Starting the A/C System................................................8
3.4 Setpoint Adjustment........................................................9
3.5 Saving and Restoring Setpoint Parameters.........10
3.6 Alarms ...............................................................................10
3.6.1 Summary Alarm..............................................................10
3.6.2 Customer Alarms ..........................................................11
3.6.3 Custom Alarms ..............................................................11
4.0 Operation .......................................................... 12
4.1 General..............................................................................12
4.2 Temperature/Humidity Sensors ..............................12
4.2.1 Economizer Air Sensors ..............................................12
4.3 Control Signals...............................................................12
4.3.1 On/Off Digital Control..................................................12
4.3.2 Proportional/Integral (P/I) Control..........................12
4.4 Temperature/Humidity Control ................................12
4.4.1 Dewpoint Control ..........................................................12
4.5 Operating Configurations...........................................13
4.5.1 Cooling..............................................................................13
4.5.1.1 Chilled Water/AWS/FC...............................................13
4.5.1.2 Compressor Based Direct Expansion (DX)...........13
4.5.2 Energy Savings Configurations ................................14
4.5.2.1 Economizer......................................................................14
4.5.2.2 Alternate Water Source Cooling (AWS) .................14
4.5.2.3 Free Cooling (FC)...........................................................15
4.5.3 Heating .............................................................................15
4.5.4 Humidifying .....................................................................15
4.5.4.1 Humidifying With Proportional Control..................15
4.5.5 Dehumidifying ................................................................15
4.5.5.1 Reheat...............................................................................15
4.6 Airflow/Fan Speed Control........................................15
4.6.1 Anti-Backdraft Mode (Optional)...............................16
4.6.2 Underfloor/Cold Aisle Pressure Control...............16
4.6.3 Modbus Fan Control (Optional).................................16
4.6.4 Suction Pressure Fan Speed Control
(Optional)..........................................................................16
4.7 Communication With the Controller........................17
4.8 Remote On/Off..............................................................17
4.9 Weekly Timer ..................................................................17
4.10 Dual Power Transfer Switching.................................17
4.10.1 Power Transfer Performed by Phase Monitors ...17
4.10.2 Power Transfer Performed by System
Controller..........................................................................18
4.11 Tandem Compressors Operation.............................18
4.12 Shadow Units..................................................................18

STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
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5.0 Menu SCREENS ................................................ 20
5.1 Main Menu .......................................................................20
5.2 Information Menu ..........................................................20
5.2.1 Operating Conditions...................................................20
5.2.2 Shadow Unit Alarms .....................................................21
5.2.3 Return Sensor.................................................................21
5.2.4 Compressor Status- (DX based systems).............21
5.2.4.1 Optional Compressor Status Fields........................21
5.2.5 Remote Sensor ..............................................................22
5.2.6 Remote Temperatures.................................................22
5.2.7 Water Temperature- (CW/FC/AWS based
systems)............................................................................22
5.2.8 Setpoint Values ..............................................................22
5.2.9 Fans and CW Valve .......................................................22
5.2.10 Economizer Information Menu Screens ................23
5.2.11 Under Floor Pressure...................................................23
5.2.12 Differential Air Pressure Sensor...............................23
5.2.13 Dewpoint Sensor...........................................................23
5.2.14 Air Speed Sensor...........................................................23
5.2.15 User Sensors ..................................................................24
5.2.16 KVA Display.....................................................................24
5.2.17 Differential Water Pressure .......................................24
5.2.18 Air Flow Rate...................................................................24
5.2.19 Water Flow Rate ............................................................24
5.2.20 Atmospheric Pressure.................................................24
5.2.21 Dual Power ......................................................................25
5.2.21.1 Dual Power with UPS...................................................25
5.2.21.2 Special Dual Power.......................................................25
5.2.22 Group Information Menu Screens ...........................26
5.2.23 Modbus Fan Data..........................................................27
5.2.24 Power Meter Data .........................................................27
5.2.25 Electronic Expansion Valve (EEV) Status..............27
5.2.26 CW Valve Feedback......................................................27
5.2.27 Software Version/Date ...............................................27
5.3 Alarm Log.........................................................................28
5.3.1 Alarms ...............................................................................28
5.3.2 Non-Critical Alarms......................................................28
5.3.3 Critical Alarms.................................................................28
5.3.4 Alarm Screen Messages.............................................28
5.4 Control Menu ..................................................................31
5.4.1 Setpoint Screens...........................................................32
5.4.1.1 High Pressure Auto Reset (Optional)......................32
5.4.1.2 Max GPM..........................................................................32
5.4.2 Alarm Setpoint Screens ..............................................32
5.4.3 Clock Screens ................................................................34
5.5 Service Menu..................................................................35
5.5.1 Cool ...................................................................................35
5.5.1.1 DX Cooling Screens......................................................35
5.5.1.2 CW Cooling Screens ................................................... 36
5.5.2 Heat ...................................................................................36
5.5.3 Humidity............................................................................36
5.5.4 Alarms ...............................................................................37
5.5.5 Sensors.............................................................................37
5.5.6 Blower...............................................................................37
5.5.6.1 Blower Set-up ................................................................37
5.5.6.2 CW Fan Set-up...............................................................37
5.5.6.3 Static Pressure Set-up................................................38
5.5.6.4 Modbus Fan Control and Data Monitoring ...........38
5.5.7 Options Menu .................................................................39
5.5.7.1 Control, Startup .............................................................39
5.5.7.2 Unit Timers ......................................................................39
5.5.7.3 T/H Offset Scaling .......................................................40
5.5.7.4 Auto Flush Cycle ...........................................................40
5.5.7.5 Barometric Pressure ..................................................40
5.5.7.6 Dual Power .....................................................................40
5.5.7.7 Custom Alarm Setup ..................................................41
5.5.7.8 Economizer Test ............................................................44
5.5.8 Digital In............................................................................44
5.5.9 Run Hours........................................................................45
5.5.10 BMS Communication...................................................45
5.5.11 Work Group Screens....................................................45
5.5.12 Save Configuration .......................................................45
5.5.13 Factory Menu..................................................................46
6.0 Economizer Operation ..................................... 47
6.2 Economizer Service Menu Screens........................48
6.2.1 Economizer Test ............................................................48
6.1 Economizer Information Menu Screens ................48
6.1.1 Economizer Return Air Sensor..................................48
6.1.2 Economizer Outside Air Sensor................................48
6.3 Enabling Economizer Operation...............................49
6.3.1 Economizer Option Screen ........................................49
6.3.2 Economizer Screen Two..............................................50
6.3.3 Economizer Screen Three..........................................50
7.0 Communication With the Controller ............... 50
7.1 Work Groups...................................................................50
7.1.1 Capacity Assist...............................................................51

STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
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7.1.2 Standby.............................................................................51
7.1.3 Unit Rotation...................................................................51
7.1.3.1 No Rotation .....................................................................51
7.1.4 Out of Service .................................................................51
7.2 Setting Up a Work Group............................................52
7.2.1 Configure the Terminal Address...............................52
7.2.2 Configure the I/O Board pLAN Address ..............52
7.2.3 Assign the Terminal to the Controller......................53
7.2.4 Fault messages .............................................................53
7.2.5 Displaying the Network Status and Firmware
Version ..............................................................................53
7.2.6 Configure Work Groups ..............................................54
7.2.6.1 Group Sensor Values....................................................60
7.2.6.2 Group Alarms .................................................................. 60
7.2.6.3 Lead Controller Group Sensors................................60
7.2.6.4 Group Sensor Status....................................................60
7.3 BMS Communication...................................................61
7.3.1 Direct BMS Control.......................................................61
7.3.2 BMS Communication...................................................61
8.0 Maintenance and repairs.................................. 62
8.1 General Maintenance...................................................62
8.2 Troubleshooting.............................................................62
8.3 Repair Procedures........................................................62
8.3.1 General..............................................................................62
8.3.2 Component Replacement..........................................62
8.4 Control I/O Module Signal LED's.............................63
9.0 Product Support............................................... 64
9.1 Factory Authorized Start Up/Warranty
Inspection ........................................................................64
9.2 Technical Support .........................................................64
9.3 Obtaining Warranty Parts ...........................................64
9.4 Obtaining Spare/Replacement Parts ....................64
Glossary....................................................................... 66
Figures
Figure 1. BMS Interface Ports ..................................................3
Figure 2. GEN1 Controller..........................................................4
Figure 3. GEN2 Controller..........................................................4
Figure 4. Menu Selections..........................................................6
Figure 5. Dewpoint Control.....................................................13
Figure 6. Cooling On/Off Cycle.............................................14
Figure 7. AWS/FC/DX Operation.........................................14
Figure 8. Service Menu Selections.......................................35
Figure 9. Economizer Operation............................................47
Figure 10. Default Economizer Zone .....................................48
Figure 11. Example Economizer Zone...................................49
Figure 12. Configuring Multiple A/C Units...........................50
Figure 13. BMS Connection Types .........................................61
Tables
Table 1. Tandem Compressor Operation Example.............18
Table 2. Factory Default Setpoints ..........................................46

STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
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STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
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1.0 GENERAL INFORMATION
1.1 Forward
The microprocessor based, STULZ E2Series Controller
covered by this manual is designed and manufactured by
STULZAirTechnology Systems, Inc. (STULZ) utilizingthe latest,
state-of-the-art control technology. Recognized as a world
leader, STULZ provides precision A/C systems and controllers
manufactured with the highest quality craftsmanship using
the finest materials available in the industry. The controller
will provide years of trouble free service if it is operated and
maintained in accordance with this manual. Damage to the
unit from improper installation, operation or maintenance is not
covered by the warranty.
This manual is applicable to the STULZ E2Series Controller
software versions for CyberAir family systems up to v3.24,
released inJuly, 2015. It contains information forthe operation
ofthe controller. STUDYthe instructionscontained in thismanual.
They must be followed to ensure properoperation. Spare parts
are availablefrom STULZto ensure continuous operation. Using
substitute parts or bypassing electrical components in order
to continue operation is not recommended and will VOID THE
WARRANTY. Dueto technological advancements, components
are subject to change without notice.
STULZ E2Series Controllers are designed primarilyto precisely
operate, control and monitor STULZ precision air conditioning
systems. Any use beyond this is deemed to be not intended.
STULZ is not liablefor anydamage resultingfrom improperuse.
All STULZ E2Series Controllers are designed for indoor use.
1.2 Safety Summary
Read and understand all instructions in this manual relating to
the specific function to be performed prior to starting the task.
Carefully read and understand all notes, cautions andwarnings
contained in this manualthat pertain to thetask to be performed.
Warnings indicate potentialthreatto personnel safety. Cautions
indicate potential threat of damage to equipment.
Carefully read and understand allWARNING and/or CAUTION
labels located on the unit.
1.3 Warnings and Cautions
STULZ uses NOTES along with CAUTION and WARNING
symbols throughout this manual to draw attention to
important operational and safety information.
A bold text NOTE marks a short message in the text to
provide an alert to an important detail.
A bold text CAUTION safety alert appears with information
that is important for protecting the equipment and its
performance. Be especially careful to read and follow all
cautions that apply to the application.
A bold text WARNING safety alert appears with information
that is important for protecting personnel from harm and
the equipment from damage. Pay very close attention to
all warnings that apply to the application.
A safety alert symbol accompanies a general WARNING
or CAUTION safety statement.
A safety alert symbol accompanies an electrical shock
hazard WARNING or CAUTION safety statement.
The following statements are general guidelines followed by
warnings and cautions applicable throughout the manual.
CAUTION
Prior to operating the unit, read and understand
all instructions, recommendations and guidelines
contained within this manual.
CAUTION
All adjustments, maintenance and/or repairs must be
performed by a qualified technician.
NOTE
We recommend contacting STULZ Product Support
for assistance with adjusting or servicing the A/C unit.
WARNING
If a fault occurs when operating the A/C unit or
adjusting control parameters, it must be corrected
immediately in accordance with the troubleshooting
instructions for the A/C unit.
CAUTION
Equipment may contain components subject to
Electrostatic Discharge (ESD). Before attempting to
mount or service these electronic devices, ensure you
have no charge built up by touching a ground source.
When possible, use a wrist-grounding strap when
working on or near electronic devices.

STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
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2.2.2 Password Protection
Access to the Info menu and Alarms log is allowed without the
use of a password. The controller is programmed to recognize
predetermined security levels before allowing accessto display
screens containing criticalvariables. Four secured menu levels
(Control, Service, Factory and Configuration) support unique
passwords that must be entered to access the menu screens
so only authorized personnel mayperform modifications to the
settings. This Manual covers Information, Control and Service
levels only. The Factory and Configuration levels are covered
in a separate manual.
2.2.3 Restorable Setpoint Parameters
Upon initial start-up the A/C system operates using the
setpoints programmed by the factory. New operating
parameters maybe entered in the Control level and the system
will then operate accordingly. The newsetpoints maybe stored
as Customer default setpoints in the Service>Save Cfg menu
screen.The primary setpoints entered bythe factorystill remain
stored in the controller's memory as Factory setpoints.
The setpointsforthe system may be re-adjusted inthe Control
level at any time. Use the Service>Save Cfg menu screen to
restore the setpoints to the Customer Default setpoint values
or to the original Factory setpoint values.
2.2.4 Weekly Timer Feature
The weekly timer allows the user to set up an operating
schedule to automatically scale back or shut down the air
conditioner during low demand or unoccupied periods. This is
an energy saving feature offering the user the ability to create
an operating schedule tailored to the needs of the building. An
evening (night-setback) schedule mayalso be created, allowing
the A/C unit to operate at night with relaxed temperature/
humidity setpoints and offsets.
2.2.5 A/C Grouping pLAN Operation
MultipleA/C units, consisting of upto eight (8) STULZ precision
air conditioners equipped with STULZ E2Series controllers,
can be connected (grouped)throughthe pLAN. The pLAN puts
all displays and controllers on a single RS485 connection to
allow information to be exchanged among all the controllers.
Each display and controller has a unique, predefined address.
Each controller in agroup can be configured as “Active”, “Assist”
or “Standby”. Units that are “Active” are used to maintain the
setpoints. Units that are “Assist” are used to step in if the
Active units are unable to maintain the setpoints. Units that
are “Standby” are used as backup units in case of a failure of
either anActive orAssist unit.The role oflead controller can be
assigned to one ofthe ActiveAC units. Rotation ofthe lead unit
function tothe next Active unit can be set to occur hourly, daily
at a specific time or weekly on a specific day at a specific time.
This allows the units within the group to be operated for equal
times on a periodictime basis. See section 7.0 formore details.
2.0 DESCRIPTION
2.1 General
The advanced microprocessor based, STULZ E2Series
controlleris a highlyversatile and flexibleA/C system controller.
It is designed primarily for STULZ Precision Air Conditioners.
The controller is equipped with flexible software capable of
meeting the specific needs of the application. The controller
is completely programmed at the factory and therefore, most
applications will require no field set-up. However, the default
setpoints and their ranges are easily viewed and adjusted
from the user interface display. The program and operating
parameters are permanently stored on flash memory in case
of power failure.
The controlleris designed to manage temperature and humidity
levels to a user defined setpoint via control output signals to
theA/C system. Control parameters havevariable outputs from
0 to 100% of the full rated capacity. The controller receives
inputs for the measurable control conditions (temperature
and relative humidity) via return air or room mounted sensors.
The internal logic determines ifthe conditions require cooling,
heating, humidification or dehumidification. Control setpoints
are established to maintain the room's designed conditions.
The controller responds accordingly to changes and controls
the output(s) to the air conditioning system so temperature/
humidity conditions reach the user defined control setpoints.
The STULZ E2Series controller continually monitors
conditions and maintains setpoints utilizing STULZ’s unique
psychrometric control method. The controller logically
examinesthe combination oftemperature and relative humidity
(dewpoint) and determines the proper control of cooling,
heating, humidification and dehumidification to move the
actual conditions to within the boundaries of the temperature/
humidity setpoints as they would appear on a psychrometric
chart. It avoids scenarios where the cooling unit might both
cool and humidify the air when cooling alone will achieve the
desired result.This control method results in higheroperational
efficiency and shorter component run-times.
2.2 Features
2.2.1 Field Configurable
The program for the STULZ E2Series controller is field
configurable, allowing the operator the capability of selecting
control setpoints specific to the application. Operator interface
forthe STULZ E2Series controlleris providedvia an attractive,
door mounted user interface display panel. The display panel
has a backlit LCD graphical displayand function keys giving the
user complete control and monitoring capability ofthe precision
cooling system. The menu driven interface provides users
the ability to scroll through and enter various menu screens.
Monitoring of room conditions and A/C system operation is
allowed without entering a password. Modifications to the
control setpoints require the use of a password.

STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
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2.2.6 BMS Interface
The STULZ E2Series controller may incorporate a
communication interface port (Figure 1) that can be field
connected to a Building Management System via Modbus,
BACnet, SNMP or HTTP protocol as configured by the factory.
A controllerinterfacedto a network must be configured for BMS
communication.
BACnet IP, BACnet Ethernet,
HTTP, SNMP, & Modbus IP
BACnet MS/TP
Modbus RTU
2.3 User Interface Terminals
Several user interface terminals are available with STULZ E2
Series controllers. The A/C unit may be equipped with a large
bezel terminal typically mounted on the door ofthe unit or a small
bezel terminal (termed "graphic terminal") which may be door
mounted or remotely mounted to a wall or control panel. See the
following sections for an overview of the user interface display
panels available.
2.3.1 Graphic Terminal
The STULZ graphic terminal features an easy to read, backlit
liquid-crystal alphanumeric display equipped with LED
illuminated function keys.The screensthat appear onthe display
present data that originates from the controller. The controller
is operated via 6-key menu-driven loop structure and offers
an alarm log plus four different interface menu levels to the
operator: Information, Control, Service, and Factory. These
menus permit the user to easily view, control and configure
operating parameters for the A/C unit (see Menu Selections,
Figure 4).
As an option, the graphic terminal may be shipped loose
for remote mounting. It may be located directly on a wall or
control panel using the mounting kit provided. Install the
terminal in a secure area where it cannot be tampered with. A
30 foot long RJ11 telephone type cable harness is provided
for interconnecting the display to the controller. Refer to the
electrical drawing supplied with the unit for details on the
interconnecting field wiring.
2.3.1.1 Function Keys
KEY FUNCTION
Accesses the active alarm screen(s)
Silences audible alarms
Resets active alarms in the alarm menu
Prg Accesses the main menu
Illuminates yellow when unit is on
Esc Returns to the previous menu level
Cancels a changed entry
Steps back to the previous screen in display menu
Changes (increases) the value of a modifiable field
Starts/Stops operation (if "Auto-On Powerup" isn't
enabled)
Moves the cursor into a modifiable field
Accepts current value of a modifiable field
Steps to the next screen in display menu
Changes (decreases) the value of a modifiable field
2.3.1.2 Alarms
Alarm conditions activate a red LED indicatorthat backlights the
alarm function key. As an option, an alarm condition mayalso be
enunciated byan audible alarm signal. An alarm is acknowledged
by pressing the alarm key. This calls up alarm display screen(s)
that provide a text message detailing the alarm condition(s).
After an alarm condition is corrected, the alarm can be cleared
by pressing the alarm key.
2.3.1.3 Contrast Adjustment
Press and hold the ( ) and (Prg) keys; then use the Up ( ) and
Down ( ) keys to adjust the contrast.
Figure 1. BMS Interface Ports

STULZ E2SERIES CONTROLLER FOR PERIMETER SYSTEMS OPERATION MANUAL
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2.3.2 Large Bezel Terminal
The large bezel terminal is typically mounted on the door of
the A/C cabinet. It features the same backlit liquid-crystal
alphanumeric display screens that the graphicterminaluses.
A round membrane type keypad is provided to the right of the
display screen to navigate through the controller menus and
adjust operating parameters.The symbols on the round keypad
are operationally identical to the function keys on the graphic
terminal (see section 2.3.1.1).
When theA/C unit is on, a soft blue light illuminatesthe "Status"
region on the right side of the terminal indicating normal
operation. If the color of the "Status" region changes to red, it
indicates an alarm condition. As with the graphic terminal, an
alarm is acknowledged by pressing the alarm symbol on the
round keypad. After an alarm condition is corrected, the alarm
can be cleared by pressing the alarm symbol again. This resets
the A/C system and turns the color in the status region back
to blue.
2.3.3 Large Bezel Touch Screen Terminal
A large bezel terminal with touch screen is available with
certain A/C models. If the A/C unit is equipped with a touch
screen terminal, refer to the addendum OZU0074 (provided
under separate cover) for supplemental instructions.
2.4 Controller Models
The controller is a microprocessor with I/O modules mounted
inside the A/C system electric box (see Figure 2 and Figure 3).
The controllercontains the softwarethat managesthe operating
parameters of the A/C system. Several I/O module types are
available depending upon the options that are needed with the
air conditioning system.
2.4.1 GEN1 Controller Layout
The GEN1 controller is shown in Figure 2.
12
43
6
5
7
The controller features called-out in Figure 2 are:
1. RJ11 telephone connector (J10) for display panel.
2. RS485 Connection for pLAN (J11).
3. Hatch for BMS or network interface port (see Figure 1).
4. Power on LED (Yellow).
5. Signal LEDs (Red, Yellow, Green). See Section 8.4.
6. Hatch for expansion I/O module(s).
7. Power connector (J1).
2.4.2 GEN2 Controller Layout
The GEN2 controller has additional input/output terminals for
expanded capability. It may be expanded with a built-in EVD
driver, utilized when electronic expansionvalve(s) are provided.
The GEN2 controller is shown in Figure 3.
12
54
8
6
93
7
Figure 2. GEN1 Controller
Figure 3. GEN2 Controller