nvent RAYCHEM ACS-30 Programming Manual

ACS- System

PROGRAMMING GUIDE

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

CONTENTS

1. Section 1 – Introduction 5

1.1. ACS-30 ..................................................................................................................................................... 5

1.1.1. PRODUCT OVERVIEW ............................................................................................................5

1.1.2. CONTROL .................................................................................................................................5

1.1.3. MONITORING AND ALARMING............................................................................................5

1.1.4. GROUND-FAULT PROTECTION ............................................................................................6

1.1.5. INSTALLATION ....................................................................................................................... 6

1.1.6. COMMUNICATIONS ...............................................................................................................6

1.1.7. COMPLETE SYSTEM .............................................................................................................. 6

1.1.8. ACS-30 PROGRAMMING GUIDE .......................................................................................... 6

1.2. Important Information .......................................................................................................................... 7

1.3. License Agreement................................................................................................................................7

1.3.1. ACS-30 SOFTWARE – LICENSE AGREEMENT .................................................................7

1.4. User Responsibilities ...........................................................................................................................10

1.5. Safety Warnings ...................................................................................................................................10

1.6. Technical Support ................................................................................................................................10

1.7. Starting the ACS-30 .............................................................................................................................10

1.7.1. INITIAL SETUP .......................................................................................................................10

1.7.2. SYSTEM REQUIREMENTS ..................................................................................................10

1.8. Control Mode Matrix ...........................................................................................................................10

1.9. Software Organization ........................................................................................................................12

1.10. Windows ................................................................................................................................................14

1.10.1. NAVIGATIONAL HEADER .....................................................................................................14

1.10.2. MAIN MENU WINDOW .........................................................................................................14

2. Section 2 – System Conguration 17

2.1. Initializing the System .........................................................................................................................17

2.1.1. SETTING UP GENERAL SYSTEM PARAMETERS ...........................................................18

2.1.2. SETTING TIME AND DATE ..................................................................................................19

2.1.3. SCANNING THE NETWORK ................................................................................................ 19

2.1.4. MAIN WINDOW .....................................................................................................................21

2.2. Setup Window ......................................................................................................................................22

2.2.1. ASSIGNING CIRCUIT IDENTIFICATION ............................................................................22

2.2.2. ASSIGNING CONTROL MODE ............................................................................................23

2.2.3. ASSIGNING AND SHARING RTD CONTROL AND MONITORING ................................26

2.2.4. SETUP|ALARM.......................................................................................................................29

2.2.5. SETUP|G.F. ..............................................................................................................................29

2.2.6. SETUP|VOLTAGE ...................................................................................................................30

2.2.7. SETUP|MAINT. .......................................................................................................................31

2.3. Status|Circuit Window ........................................................................................................................32

2.4. Status|RTDs Window ..........................................................................................................................33

2.5. Status|Min/Max Window ....................................................................................................................34

2.6. Status|Energy Window ........................................................................................................................35

2.7. Status|Maint. Window ........................................................................................................................38

2.8. Events Window .....................................................................................................................................39

2.9. Network|Relays Window ....................................................................................................................41

2.10. Network|RTDs Window .......................................................................................................................41

2.11. Network|Maint. Window .....................................................................................................................42

2.12. Network|Remove Window..................................................................................................................42

2.13. System|Relays Window ......................................................................................................................43

2.14. System|Comm Window ......................................................................................................................43

2.15. System|Password Window ................................................................................................................45

2.16. System|Maint. Window .......................................................................................................................46

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3. Control Mode Congurations 47

3.1. Unassign Mode ....................................................................................................................................48

3.2. HWAT Mode ..........................................................................................................................................48

3.2.1. ENTER SYSTEM INFORMATION ........................................................................................48

3.2.2. CONFIGURING HWAT ..........................................................................................................51

3.3. Frost Heave Mode ...............................................................................................................................55

3.4. Floor Heating Mode .............................................................................................................................59

3.5. Pipe Freeze Mode ................................................................................................................................64

3.5.1. TEMP CONTROL – AMBIENT CONTROL .........................................................................64

3.5.2. TEMP CONTROL – LINE CONTROL ..................................................................................69

3.5.3. TEMP CONTROL – PASC CONTROL .................................................................................73

3.6. Fuel Oil Mode ........................................................................................................................................79

3.6.1. TEMP CONTROL – AMBIENT CONTROL .........................................................................79

3.6.2. TEMP CONTROL – LINE CONTROL ..................................................................................83

3.6.3. TEMP CONTROL – PASC CONTROL .................................................................................88

3.7. Greasy Waste and Temperature Maintenance Mode ...................................................................93

3.8. Roof and Gutter De-icing Mode ........................................................................................................98

3.8.1. TEMP CONTROL – EXTERNAL DEVICE CONTROL .......................................................98

3.8.2. TEMP CONTROL – AMBIENT TEMPERATURE CONTROL ........................................ 102

3.8.3. TEMP CONTROL – BRACKETED AMBIENT TEMPERATURE CONTROL ................ 105

3.8.4. TEMP CONTROL – SURFACE TEMPERATURE CONTROL ....................................... 109

3.9. Snow Melting Mode ......................................................................................................................... 113

3.9.1. TEMP CONTROL – EXTERNAL DEVICE CONTROL .................................................... 113

3.9.2. TEMP CONTROL – AMBIENT TEMPERATURE CONTROL ........................................ 117

3.9.3. TEMP CONTROL – SURFACE TEMPERATURE CONTROL ....................................... 121

4. Temperature Monitor Only Circuits 125

4.1. Assigning a Temp Monitor Circuit ................................................................................................. 125

4.1.1. SELECTING THE TEMPERATURE MONITORING CIRCUIT ........................................ 125

4.1.2. NAMING THE TEMPERATURE MONITORING CIRCUITS ........................................... 126

5. Appendices 128

5.1. Appendix 5.1 Proportional Ambient Sensing Control (PASC) Control Mode ........................ 128

5.2. Appendix 5.2 24/7 Scheduler ......................................................................................................... 129

5.3. Appendix 5.3 Connecting External Control Devices ................................................................... 132

5.4. TermsandDenitions ...................................................................................................................... 137

5.5. Alarm:E-mailNotication ............................................................................................................... 137

5.6. Appendix 5.6 ACS-30 Program Integrator .................................................................................... 138

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

1. SECTION 1 – INTRODUCTION

ALARM

C910 SERIES

SHIFT TEST

BACK ENTER

STATUS

ALARM

OUTPUT

MONITORCONFIG

PROGRAMMABLE SINGLE POINT
HEAT-TRACING CONTROLLER

1.1. ACS-30

1.1.1. PRODUCT OVERVIEW

The nVent RAYCHEM ACS-30 Advanced Commercial Control System is a multipoint electronic
control and monitoring system for nVent RAYCHEM and nVent PYROTENAX heating cables. The
ACS-30 supports the following applications: hot water temperature maintenance, freezer frost heave
prevention, floor heating, pipe freeze protection, fuel oil flow maintenance, greasy waste disposal
flow maintenance, roof & gutter de-icing and surface snow melting. The ACS-30 system can control
and monitor up to 260 heating circuits with multiple networked nVent RAYCHEM ACS-PCM2-5
panels. Each ACS-PCM2-5 panel can control up to five individual window circuits. The ACS-30 is
available with five Electromechanical Relays (EMRs) that allow switching up to 30 amperes at 277 V.
Each heating cable circuit can have up to four Resistance Temperature Detector (RTD) sensor inputs
allowing for a variety of combinations of temperature control, monitoring and alarming. When single
circuit extensions are required the nVent RAYCHEM C910-485 controller can be added the ACS-30
network. The C910-485 will allow for assigning two RTD's (local to the C910-485) to the circuit.

RS-485 RS-485RS-485 RS-485

RMM2 Remote

monitoring module

ACS-UIT2

C910-485

ACS-PCM2-5

ACS-PCM2-5 ACS-PCM2-5

Fig. 1.1 ACS-30 System

1.1.2. CONTROL

The ACS-30 is a commercial control system that measures temperatures with 3-wire, 100-ohm
platinum RTDs connected directly to the ACS-PCM2-5, the C910-485 or through optional Remote
Monitoring Modules (RMM2). Each ACS-PCM2-5 accepts up to five RTDs, each C910-485 accepts
two RTD's, and each RMM2 accepts up to eight RTDs. The RMM2s are typically located near the
desired measurement location (RTDs). Multiple RMM2s are networked to the ACS-UIT2, significantly
reducing the cost of RTD field wiring. The ACS-30 system supports up to 260 temperature inputs
via the PCM boards contained within the ACS-PCM2-5 panel. Using RMM2s, an additional 128
temperature inputs can be supported for a maximum of 388 temperature inputs. The ACS-30 can
be configured for On/Off, ambient sensing, and timed duty cycle control modes.

1.1.3. MONITORING AND ALARMING

The ACS-30 can monitor ground-fault, temperature, and current during system operation.
Configurable alarm settings provide options for local or remote alarms. Dry contact relays are
provided for alarm annunciation back to a local LAN, fire control panel or Building Management
System (BMS).

Optional nVent RAYCHEM ProtoNode multi-protocol gateways are available for integrating the
ACS-30 controller into a BACnet® or LonWorks® system.

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1.1.4. GROUND-FAULT PROTECTION

To minimize the danger of fire from sustained electrical arcing if the heating cable is damaged
or improperly installed, and to comply with nVent Building Solutions requirements, agency
certifications, and national electrical codes, ground-fault equipment protection must be used on
each heating cable branch circuit.

The ACS-30 controller provides this protection. Therefore, additional ground-fault protection is
generally not necessary. However, national electrical codes require that in order to prevent

electric shock to personnel, 5-mA, Class A ground-fault protection devices (GFCI’s) are installed
when electric floor heating is used in kitchens and baths. The ACS-3O does not provide this level

of personnel ground-fault protection. For these applications the appropriate GFCI must be installed
in the power distribution panel.

1.1.5. INSTALLATION

The ACS-30 system is programmed using the User Interface Terminal (ACS-UIT2) that has LCD
color touch-screen display technology. The ACS-UIT2 provides a user interface for easy and
efficient programming without keyboards or cryptic labels. The ACS-UIT2 is mounted remotely in a
nonhazardous, indoor or outdoor locations.

Heating cable circuits are connected to the ACS-UIT2 via ACS-PCM2-5 control panels, or C910­485 controllers. The ACS-PCM2-5 panels and C910-485 controller can be distributed throughout
the installation to where the heating cable circuits are located. The control panels/controllers
should be located adjacent to circuit breaker panels and are connected in series to the ACS-UIT2
with RS-485 cable.

1.1.6. COMMUNICATIONS

The ACS-UIT2 supports the Modbus® protocol and is available with an RS-232, RS-485 or
10/100Base-T Ethernet communication interface. The ACS-30 system may be integrated into
BACnet, Metasys N2 and LonWorks Building Management Systems (BMS) using the ProtoNode
gateway translators available through nVent Building Solutions.

1.1.7. COMPLETE SYSTEM

A complete ACS-30 system consists of an ACS-UIT2 and up to 52 modular power control panels
(ACS-PCM2-5) ready for field connections of power wiring, heat tracing and temperature sensors.

1.1.8. ACS-30 PROGRAMMING GUIDE

This guide assists in the set up and operation of the ACS-30 system.

The ACS-30 software, installed in the ACS-UIT2 (User Interface Terminal), supports the ACS-PCM2-5
power control panels, C910-485 controllers and additional RTD inputs via the RMM2.

The software provides several features to help configure and maintain the nVent RAYCHEM
devices. This document is not intended to provide detailed explanations of the specific features of
each product, but rather to show how to access various parameters within the devices using the
ACS-30 software. Please refer to specific detailed product documentation:

• ACS-PCM2-5 Installation Instructions (H58672)

• ACS-UIT2 Installation Instructions (H58661)

• ACS-UIT2 Modbus Protocol Interface Mapping for ACS-30 Systems (H58685)

• ACS-30 Program Integrator Manual (H58325)

• ProtoNode Installation Instructions (H58622)

• C910-485 Installation, Operation and Maintenance Manual (H58415)

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

1.2. IMPORTANT INFORMATION

This manual is a guide for the setup and operation of the ACS-30 Advanced Commercial Control
System, a multipoint electronic control and monitoring system.

Important: All information, including illustrations, is believed to be reliable. Users, however, should
independently evaluate the suitability of each product for their particular application.

nVent Building Solutions makes no warranties as to the accuracy or completeness of the
information, and disclaims any liability regarding its use.

nVent only obligations are those in the nVent Standard Terms and Conditions of Sale for this
product, and in no case will nVent or its distributors be liable for any incidental, indirect, or
consequential damages arising from the sale, resale, use, or misuse of the product. Specifications
are subject to change without notice. In addition, nVent reserves the right to make changes—without
notification to Buyer—to processing or materials that do not affect compliance with any applicable
specification.

1.3. LICENSE AGREEMENT

1.3.1. ACS-30 SOFTWARE – LICENSE AGREEMENT

This agreement is a legal agreement between you, “the end user”, and nVent Thermal
Management, LLC (“nVent Thermal Management”). BY INSTALLING OR OTHERWISE
ACCESSING THIS PROGRAM, YOU ARE AGREEING TO BECOME BOUND BY THE TERMS OF
THIS AGREEMENT. IF YOU DO NOT AGREE TO THE TERMS OF THIS AGREEMENT, DO NOT
INSTALL OR ACCESS THIS PROGRAM. IF INSTALLING OR OTHERWISE ACCESSING THIS
PROGRAM BY OPENING A SEALED DISK PACKAGE, PROMPTLY RETURN THE UNOPENED
DISK PACKAGE AND THE OTHER ITEMS (INCLUDING WRITTEN MATERIALS OR OTHER
CONTAINERS) TO THE PLACE WHERE YOU OBTAINED THEM.

1. GRANT OF LICENSE The ACS-30 Software (the “Software”) is licensed, not sold, to you for use

2. OTHER RESTRICTIONS

1. You may not sublicense, rent or lease the ACS-30 Software to anyone.

2. You agree to notify nVent promptly if “bugs” or seemingly incorrect or anomalous behavior

3. You agree that the ACS-30 Software, including written materials (if any) and all copies in

only under the terms of this Agreement, and nVent reserves any rights not exactly granted to
you. Subject to the terms and conditions of this Agreement, nVent grants to you a non-exclusive,
nontransferable, limited license (without the right to sublicense others) to use the one copy,
including written materials if any, of the Software on a single computer at the location (company
and address) to which nVent issued this copy of the ACS-30 Software. The Software is owned
by nVent and is protected by United States copyright laws and international treaty provisions. All
copies made by you are subject to the terms and conditions of this Agreement. The structure,
organization and code of the Software are valuable trade secrets and confidential information
of nVent. You agree not to modify, alter, merge, adapt, duplicate, distribute, translate, decompile,
disassemble, reverse engineer, create derivative works, copy for use on any other computer or
at any other location, or otherwise make this software available to any person or entity outside
this location. The Software is licensed only to you. In no event may you transfer, sell, sublicense,
rent, assign or transfer rights, lease, or otherwise dispose of the Software on a temporary or
permanent basis without the prior written consent of nVent. You agree to use reasonable efforts
to protect against the unauthorized copying and use of the Software by others. You agree not
to remove, disable or circumvent any proprietary notices or labels contained on or within the
Software.

is discovered when using the Software.

whole or in part, will be destroyed or returned to nVent at the written request of the nVent
product manager.

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4. By installing or otherwise accessing the ACS-30 Software you acknowledge that you
have read and understood nVent Disclaimer of Warranty and Limitation of Liability,
set forth below.

5. You agree to use reasonable efforts to protect against the unauthorized copying and use the
ACS-30 Software by others.

DISCLAIMER OF WARRANTY THE ACS-30 SOFTWARE AND ACCOMPANYING WRITTEN

MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND. THE ENTIRE RISK
AS TO THE RESULTS AND PERFORMANCE OF THE ACS-30 SOFTWARE IS ASSUMED BY
YOU. NVENT DOES NOT WARRANT THAT THE FUNCTIONS CONTAINED IN THE SOFTWARE
WILL MEET YOUR REQUIREMENTS OR THAT THE OPERATION OF THE SOFTWARE WILL BE
UNINTERRUPTED OR ERROR-FREE, OR THAT PROGRAM DEFECTS WILL BE CORRECTED.

LIMITED WARRANTY – MEDIA THE MEDIUM ON WHICH THE PROGRAM IS ENCODED IS

WARRANTED TO BE FREE FROM DEFECTS IN MATERIAL AND WORKMANSHIP UNDER
NORMAL USE FOR A PERIOD OF SIXTY (60) DAYS FROM THE DATE OF DELIVERY TO YOU
AS EVIDENCED BY A COPY OF YOUR RECEIPT. ALTHOUGH NVENT BELIEVES THE MEDIA
AND THE PROGRAM TO BE FREE OF VIRUSES, THE MEDIUM AND THE PROGRAM ARE NOT
WARRANTED TO BE VIRUS FREE. NVENT LIABILITY AND YOUR EXCLUSIVE REMEDY IF THE
MEDIUM IS DEFECTIVE OR INCLUDES ANY VIRUS SHALL BE PROMPT REPLACEMENT OF THE
MEDIUM WITH A NEW ACS-30 SOFTWARE PRE-ENCODED DISC.

EXCLUSION OF ALL OTHER WARRANTIES EXCEPT AS EXACTLY PROVIDED ABOVE, NVENT

DISCLAIMS ALL WARRANTIES, EITHER EXACT, IMPLIED OR STATUTORY, INCLUDING BUT
NOT LIMITED TO ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, EVEN IF NVENT HAS BEEN ADVISED OF SUCH PURPOSE. THIS AGREEMENT
GIVES YOU SPECIFIC LEGAL RIGHTS. SOME STATES OR COUNTRIES DO NOT ALLOW THE
EXCLUSION OF WARRANTIES SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU.

LIMITATION OF LIABILITY THE ENTIRE RISK AS TO THE RESULTS AND PERFORMANCE OF THE

SOFTWARE IS ASSUMED BY YOU. IN NO EVENT SHALL NVENT, ITS AFFILIATES, DIRECTORS,
OFFICERS, SHAREHOLDERS, EMPLOYEES OR OTHER REPRE-SENTATIVES BE LIABLE FOR
DAMAGES OF ANY KIND, INCLUDING WITHOUT LIMITATION, ANY LOSS, DAMAGE, OR DELAY,
OR FOR ANY LOST PROFITS, LOSS OF USE, INTERRUPTION OF BUSINESS, OR FOR ANY
COMPENSATORY, SPECIAL, INCIDENTAL, CONSEQUENTIAL, INDIRECT DAMAGES (HOWEVER
ARISING, INCLUDING NEGLIGENCE) OF ANY KIND ARISING OUT OF OR IN CONNECTION
WITH THE USE OF, OR THE INABILITY TO USE, THE SOFTWARE OR THIS AGREEMENT (EVEN
IF NVENT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES). FURTHER, IN NO
EVENT SHALL NVENT, ITS AFFILIATES, DIRECTORS, OFFICERS, SHAREHOLDERS, EMPLOYEES
OR OTHER REPRESENTATIVES BE LIABLE TO YOU IN AN AMOUNT GREATER THAN THE
AMOUNT ACTUALLY PAID BY YOU, IF ANY, FOR THE SOFTWARE.

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YOU FURTHER AGREE THAT REGARDLESS OF ANY STATUTE OR LAW TO THE CONTRARY, ANY

CLAIM OR CAUSE OF ACTION ARISING OUT OF OR RELATED TO USE OF THE SOFTWARE OR
THE TERMS AND CONDITIONS MUST BE FILED WITHIN ONE (1) YEAR AFTER SUCH CLAIM OR
CAUSE OF ACTION AROSE OR BE FOREVER BARRED.

INDEMNITY. To the extent allowed under federal and state law, you agree to indemnify and hold

nVent, its parents, subsidiaries, affiliates, officers, employees, sponsors and partners harmless
from any claim, loss, cost, expense, demand, or damage, including reasonable attorneys’ fees,
arising directly or indirectly out of (a) your use of, or inability to use, the Software, (b) your
activities in connection therewith, or (c) your breach of this Agreement or violation of the rights
of any other party.

TERMINATION The license granted herein will automatically terminate without notice from nVent

if you fail to comply with any term or condition of this Agreement. You agree, upon such
termination, to remove the ACS-30 Software from any memory and/or storage media or device,
and to return the ACS-30 Software, including all media and written materials, or destroy the
same and certify such destruction to nVent, along with any backup or other copies in your
possession.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

COMPLETE AGREEMENT – MODIFICATION IN WRITING This Agreement constitutes the sole and

complete understanding between the parties with respect to the ACS-30 Software and its use,
and may not be varied except by a writing signed by an officer of nVent. You agree that you may
not rely on any representations concerning the ACS-30 Software to the extent they vary from
this Agreement, and such representations, if any, will neither add to nor vary the terms of this
Agreement.

CHOICE OF LAWS This Agreement is governed by the laws of the State of California and the United

States, including U.S. Copyright Laws.

EXPORT LAWS The ACS-30 Software may require a license from the U.S. Department of

Commerce or other governmental agency before it may be exported. The term “export” includes
many acts (such as transferring the ACS-30 Software to a foreign citizen within the United
States), in addition to sending or taking the ACS-30 Software outside the United States. You
agree to ascertain the necessary licensing procedures and obtain any required licenses before
exporting the ACS-30 Software. You also agree to indemnify nVent and assume all financial
responsibility for any losses it may suffer if you do not comply with this paragraph.

GOVERNMENT RESTRICTED RIGHTS User acknowledges that the ACS-30 Software has been

developed at private expense and is provided with “Restricted Rights.” Use, duplication or
disclosure by the Government is subject to restrictions as set forth in subparagraph (b)(3) and
paragraph (c) of the Rights in Technical Data clause at 48 C.F.R. 252.227-7013, or subparagraphs
(c)(1) and (2) of the Commercial Computer Software – Restricted Rights clause at 48 C.F.R.

52.227-19, as applicable. This provision applies to the ACS-30 Software acquired directly or
indirectly by or on behalf of any government. The ACS-30 Software is a commercial product,
licensed on the open market at market prices, and was developed entirely at private expense
and without the use of any government funds. Any use, modification, reproduction, release,
performance, display, or disclosure of the ACS-30 Software by any government shall be governed
solely by the terms of this Agreement and shall be prohibited except to the extent exactly
permitted by the terms of this Agreement, and no license to the ACS-30 Software is granted to
any government requiring different terms.

ASSIGNMENT You may neither assign any right nor delegate any obligation under this Agreement

and attempted assignment or delegation shall be void. nVent may freely assign this agreement
and its rights and obligations there under to any third party.

INVALID PROVISIONS If any of the provisions of this provisions Agreement are invalid under any

applicable statute or rule of law, they are to that extent deemed omitted.

WAIVER No failure or delay of nVent in exercising or enforcing any right or provision of this

Agreement shall constitute a waiver of such right or provision, or any other right or provision
hereunder. Furthermore, any waiver by nVent of any right or provision of this Agreement shall
not be construed as, or constitute, a continuing waiver of such right or provision, or waiver of
any other right or provision of this Agreement.

HEADINGS The section titles in this Agreement are for convenience only.

SURVIVABILITY You agree that the terms and conditions of this Agreement shall survive any

termination of this Agreement and your rights to use the Software.

Should you have any questions concerning this Agreement, or if you desire to contact nVent for
any reason, please write to:

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

NVENT THERMAL MANAGEMENT

899 Broadway St.
Redwood City, CA 94063-3104
U.S.A

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1.4. USER RESPONSIBILITIES

1.5. SAFETY WARNINGS

1.6. TECHNICAL SUPPORT

The performance, reliability and safety of your heating cable system depend on proper design,
selection, and installation. The ACS-30 Software will help you configure and monitor a system that
meets your requirements, but it is only a tool. It assumes that your input is accurate, that you are
familiar with heating system design and configuration, and that you will ensure that all components
of the heating system are installed, maintained and used as intended. The configuration of the ACS­30 Software should be reviewed by a knowledgeable engineer to ensure it is appropriate for your
application. Additional information relating to safety, design, and installation is contained in Design
Guides, Installation Manuals, Data Sheets, and other literature available from nVent. Be sure to
consult these documents as needed.

There are important safety warnings shipped with nVent products and printed in the ACS-UIT2
Installation Instructions (H58661), the ACS-PCM2-5 Installation Instructions (H58672) and in
the ACS-30 Program Integrator User Manual (H58325). Be sure to read and follow these safety
warnings to reduce the risk of fire, shock, or personal injury. If you have any questions, contact your
local representative or contact nVent directly.

For technical support, contact your local representative, or contact nVent directly:

NVENT THERMAL MANAGEMENT

Tel: [phone]
Tel: [phone] (outside U.S.)
Fax: [phone]
Fax: [phone]
email: [e-mail]

1.7. STARTING THE ACS-30

1.8. CONTROL MODE MATRIX

1.7.1. INITIAL SETUP

The ACS-30 software is designed to run only on the ACS-UIT2 hardware platform. Prior to shipment,
the ACS-30 software is installed into a nonvolatile area of the ACS-UIT2 memory. During the initial
power-up, you will see a blue background “splash” window for approximately 30 seconds as the
system software is loaded and initializes.

This V7.0.X program update is compatible only with the ACS-UIT2 User Interface Terminal but
will support both ACS-PCM-5 and ACS-PCM2-5 power control modules as well as the C910-485
controller.

1.7.2. SYSTEM REQUIREMENTS

The minimum configuration to use the ACS-30 software is:

• ACS-UIT2

• At least one ACS-PCM2-5

Maximum equipment configuration:

• The ACS-UIT2 can control up to 260 circuits. Each ACS-PCM2-5 handles 5 circuits and
the C910-485 is a single circuit controller. There are 99 address that can be assigned to
ACS-PCM2-5 control panels, C910-485 controllers and RMM2.

• Up to 16 RMM2 (8 channel RTD multiplexing hubs)

The ACS-30 is designed for nVent commercial heating cable systems and their applications. The
programming is focused on eight heating cable applications, and a monitor only mode, with control

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

parameters embedded in the software to simplify assigning heating cable circuits. The application

TABLE

designs and assumptions are detailed in their associated design guides and installation manuals
which can be found on www.nVent.com.

The control mode functions programmed in the ACS-30 for each application are summarized in
Table 1.1. These control modes will be discussed in more detail in the configuration section of this
programming guide.

1.1 ACS-30: HEATING CABLE APPLICATION PROGRAMMING SUMMARY

CONTROL MODE FUNCTIONS

APPLICATION

Hot Water Temperature
Maintenance

Floor Heating

NVENT RAYCHEM
HEATING CABLE

CONTROL MODE CONTROL SETPOINTS

• HWAT • Preset power duty cycle

• (HWAT Design Wizard)

• RaySol

• Floor sensing • Constant temp

• MI heating cable

Greasy Waste Disposal and
Temperature Maintenance

Pipe Freeze Protection

• XL-Trace • Line sensing • Constant temp

• XL-Trace • Ambient, PASC or

line sensing

Fuel Oil Flow Maintenance

• XL-Trace • Ambient, PASC or line
sensing

Freezer Frost Heave Prevention

• RaySol

• Floor sensing • Constant temp

• MI heating cable

Surface Snow Melting

Roof & Gutter De-icing

• ElectroMelt

• MI Heating Cable

• IceStop

• MI Heating Cable

• Ambient or surface temp • Constant temp

• External controller • External snow controller

• Ambient or surface temp • Constant temp

• External controller • External snow controller

• Constant temp

• Variable schedule

- Maintain

- Economy

- Off

- Heat Cycle (R2 only)

• Variable schedule

- Maintain

- Economy

- Off

• Circuit override through
RTD or external device

• Variable schedule

- Maintain

- Economy

- Off

• Constant temp

• Circuit override through

external device

• Constant temp

• Circuit override through

RTD or external device

• Variable schedule

- Maint

Temperature Monitor Only

Five temperature monitor only channels
Low and high temperature alarms

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Variable Schedule
Setpoint calendar with:

• 7 days/week calendar

• 48 1/2-hr time blocks/day

• Daily schedule copy function

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1.9. SOFTWARE ORGANIZATION

LC = Line currentGF = Ground fault

ACS-PCM2-5 / Circuit #

LC = Line current GF = Ground fault

External Override device,

BMS output or snow controller

The ACS-30 is organized around the concept of heating control circuits connected to relay outputs
from the ACS-PCM boards within the ACS-PCM2-5 power control panels. A simple circuit consists
of one output relay and one RTD sensor input.

Fig. 1.2 Simple control circuit

Heating control circuits can also be connected to the dry contact output of BMS systems, external
monitoring devices or moisture sensing controllers for roof & gutter and snow melting applications.
Refer to Appendix 5.3 Connecting External Control Devices on page 130 for more detailed
information.

Local/A
RTD

Local
RTD

Local
RTD

Local
RTD

Local
RTD

LC

1

2

3

4

5

GF

LC
GF

LC
GF

LC
GF

LC
GF

Output
Relay 1

Output
Relay 2

Output
Relay 3

Output
Relay 4

Output
Relay 5

Dry

alarm

contact

EUR-5A
APS-3C
GIT-3A*
LCD-7A

* Requires external dry contact.

Fig. 1.3 External control circuit

ACS-PCM2-5 / Circuit #

Local/A
RTD

Local
RTD

Local
RTD

Local
RTD

Local
RTD

LC

1

2

3

4

5

GF

LC
GF

LC
GF

LC
GF

LC
GF

Output
Relay 1

Output
Relay 2

Output
Relay 3

Output
Relay 4

Output
Relay 5

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

ACS-PCM2-5 / Circuit #

Local/A

RMM2

RMM2

RTD

Local
RTD

Local
RTD

Local
RTD

Local
RTD

LC

1

2

3

4

5

GF

LC
GF

LC
GF

LC
GF

LC
GF

Output
Relay 1

Output
Relay 2

Output
Relay 3

Output
Relay 4

Output
Relay 5

ACS-UIT2

RS-485

LC = Line current
GF = Ground fault

B #1

C 2

D 3

4

5

Additional RTDs

6

7

8

Fig. 1.4 Multiple RTD input control circuit

A circuit may also be controlled by multiple RTD inputs by adding a RMM2 module to the network.
Multiple RTDs may be used for control or monitoring of a heating circuit.

B #1

C 2

D 3

4

5

6

7

8

ACS-PCM2-5

/ Circuit #

1

2

3

4

5

RS-485

LC
GF

LC
GF

LC
GF

LC
GF

LC
GF

Additional
RTDs

Output
Relay 1

Output
Relay 2

Output
Relay 3

Output
Relay 4

Output
Relay 5

ACS-PCM2-5

/ Circuit #

Local/A
RTD

Local
RTD

Local
RTD

Local
RTD

Local
RTD

ACS-UIT2

RS-485

Local/A RTD

Local/B RTD

RS-485

1

2

3

4

5

C910-485

LC
GF

LC
GF

LC
GF

LC
GF

LC
GF

Output
Relay 1

Output
Relay 2

Output
Relay 3

Output
Relay 4

Output
Relay 5

RS-485

Local/A
RTD

Local
RTD

Local
RTD

Local
RTD

Local
RTD

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 1.5 Multiple ACS-PCMs, C910-485 and RMM2

More advanced systems can have multiple heating circuits sharing RTDs for control and monitoring.

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1.10. WINDOWS

Fig. 1.6 Window layout

The top row of the window contains the main menu buttons, and the bottom row contains subsets
of those main menu buttons.

When asked to navigate between windows in this manual, tap the main menu and submenu buttons.

1.10.1. NAVIGATIONAL HEADER

At the top of the Setup and Status windows, a navigational header displays the following data (from
left to right):

A. ID tag “Hot water line 1”

B. ACS-PCM2-5 address “01”

C. Relay output number “1”

D. Application control mode “HWAT”

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Fig. 1.7 Navigational header

1.10.2. MAIN MENU WINDOW

The main menu window displays the status of all circuits (PCM/relay numbers) that have been set
up. The circuits can be accessed from this window by tapping anywhere on the row for the circuit. If
the circuit is unassigned tapping on the row will allow you to set the control mode and parameters.
If it is already assigned tapping on the row will allow you to edit the control mode and parameters.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 1.8 Main window with circuit status

The main window displays:

Status Time and Date: The current time and date is displayed

Ckt# Displays the connected ACS-PCM2-5 power panels and the pre-

assigned circuit number for each of their five relays (e.g. 1-1, 1-2,
1-3, 1-5) C910-485 controllers will only show a single circuit number

ID Identification tag for the circuit

Mode Displays the application control mode for the circuit. Refer to keep

together on one line and the associated nVent product design guide for
further information concerning the application.

N/A Circuit has not been set up and is unassigned

HWAT Circuit has been set up for a hot water maintenance application.

Frost heave Circuit has been set up for a freezer frost heave application.

Floor heating Circuit has been set up for a floor heating application

Pipe freeze Circuit has been set up for a pipe freeze protection application

Fuel Oil Circuit has been set up for a fuel oil flow maintenance application

Greasy waste/TM Circuit has been set up for a greasy waste flow maintenance

application or non-freeze protection temperature maintenance
applications.

RFGT Circuit has been set up for roof & gutter de-icing.

SMLT Circuit has been set up for snow melting.

TMON Temperature monitoring only has been set up, no relay or circuit is

dedicated.

°F or °C The current lowest measured temperature of any RTD assigned to
monitor the circuit

SetP Desired maintain/control temperature setpoint

Amps Heating cable circuit current draw (A)

G.F. Heating cable ground-fault current (mA)

Status Relay (on, off or ground-fault trip) and communication status (Com)

Color Coding of Main Window

The data in the °F/°C, Amps, and G.F. columns are displayed in color to identify their current state.

Green When heating cable is energized (status On), within normal range of
setup parameters
Red In alarm condition

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

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Orange Temperature not within setpoint plus deadband range (°F/°C)

Note: This is not applicable for the HWAT control mode.

Alarm Relay Status

Green No alarm

Red In alarm condition

Note: ACS-30 Program Integrator has been developed to pre-assign the circuits and control

variables, see Appendix 5.6 ACS-30 Program Integrator on page 137.

Main Window and Events Navigation
Navigation Buttons

At the bottom of the Main window and Events window, the navigation buttons will appear once six
circuits are displayed. Use buttons to scroll up and down to view the status of the circuits on the
Main window, and on the Events/Alarms on the Events window.

When in the Main or Events windows, tap on anywhere on a row for a circuit to see the Status
window for that circuit.

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Fig. 1.9 Main window and navigation buttons

TABLE 1.2 NAVIGATION BUTTONS

Top of list When selected, displays the first five circuits of the Main and the

Events windows.

Page up When selected, displays the previous five circuits of the Main and

the Events windows.

Move up one

circuit

Move down one

circuit

When selected, displays the previous circuit on the Main and the

Events windows.

When selected, displays the next circuit on the Main and the Events

windows.

Page down When selected, displays the next five circuits of the Main and the

Events windows.

Bottom of list When selected, displays the last five circuits of the Main and the

Events windows.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

2. SECTION 2 – SYSTEM CONFIGURATION

2.1. INITIALIZING THE SYSTEM

When the ACS-UIT2 is first powered, it will display the Start-up window showing the program
loading progress.

Fig. 2.1 Initial ACS software loading display window

When the ACS-UIT2 is powered on for the first time, date and units will not been assigned. In
addition, the ACS-UIT2 has not yet scanned the network for connected external devices such as
ACS-PCM2-5 Heat-Trace Control Panels (containing the ACS-CRM card rack modules), C910-485
controllers and RMM2 RTD multiplexing hubs.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.2 Start-up window with no devices detected

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2.1.1. SETTING UP GENERAL SYSTEM PARAMETERS

Tap System|Misc to enter the appropriate units and general system parameters.

Fig. 2.3 System|Misc window

The System|Misc window provides the following controls:

Units: Select Fahrenheit (ºF) or Celsius (ºC) as temperature units.

Screen Saver Timer: Select the number of minutes the display remains visible with no user activity

before moving into Screen Saver mode. The Screen Saver mode turns the screen to black (no
backlight) and no alarms will be visible.

If an alarm occurs, a red light on the front of the enclosure illuminates. The window must be
touched to show the circuit’s alarm status.

IMPORTANT: Using the screen saver enhances the lifetime of the screen.

Range: 1–300 minutes
Default: 20 minutes

Main Menu Timer: Sets the number of minutes before the display automatically reverts to the Main
window.

Range: 1–100 minutes

Default: 10 minutes
Note: This time entry also determines how long a password entry will remain valid (see
System|Password section)

Mouse: Allows the USB port on the ACS-UIT2 to function with a mouse installed. If enabled, a
mouse pointer will be visible on the UIT window and will allow the user to navigate through the
windows.

Options: OFF, ON

Default: OFF

Stagger Start: Set the time delay for energizing each relay in a ACS-PCM2-5 panel, C910-485
controllers to reduce the additive start-up current load for the system.

Range: 0–30 minutes

Default: 0 minutes

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

2.1.2. SETTING TIME AND DATE

Tap System|Clock to set the time and date.

Fig. 2.4 System|Clock window

Time: Enter the current time using 24 hour format

Date: Enter the correct date from the pop-up calendar

2.1.3. SCANNING THE NETWORK

After the ACS-UIT2 is connected to the external ACS-PCM2-5 modular power control panels, C910­485 controllers and any RMMs via the RS-485 network, and all circuits have been installed and
commissioning tests completed, the ACS-UIT2 is ready to scan the network for connected devices.

Tap Network|Device. The first time the system is started this list will be empty.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.5 Update Network button

Tap the Update Network button to start the network scan. A progress bar will be displayed as the
system scan proceeds

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Fig. 2.6 Scanning network

The program scans for Device Addresses for the ACS-CRM board in the ACS-PCM2-5 panels,
attached RTDs, C910-485 Controllers, RMM2 modules, and creates a database within the system.
Once the database exists, no further scanning is done. A device address is the number assigned
via the rotary switches on the ACS-PCM2-5 panel or RMM2 circuit board. Each device must have
a unique device address number. For example, if the design requires both an ACS-PCM2-5 and
a RMM2, and 32 is chosen for device address number for the ACS-CRM, then the RMM2 cannot
also use address 32. (See Table 2.1 Available Device Addresses on page 25). See the ACS-PCM2-5
Installation Instructions (H58238), C910-485 Installation Instructions (H58415) and RMM2
Installation Instructions (H56848) for more information.

To set the modbus address for a C910-485 controller, reference C910-485 Installation Instructions
(H58415).

nVent.com | 20

Fig. 2.7 Network|Device window after system scan

Verify that all of the expected hardware devices were found by checking the Network|Device display.
If a device appears to be missing, manually initiate a new scan by taping the Update Network
button. If an expected device does not appear on the list after several scans, it is most likely
physically disconnected from the RS-485 network wiring, or is not powered. Troubleshoot and verify
all network and power connections.

Note: If a new external hardware device is added after the initial manual scan, you must initiate a
new scan by going to the Network|Device window and tapping the Update Network button.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

To add a new device (ACS-PCM2-5, C910-485 or RMM2), make sure it:

• Has a unique address

• Has power

• Is connected to the RS-485 wiring

Then push Update Network to add the device to the list.

Note: Removal of Device: If you remove a device or RTD from the network, using the Update
Network button will not remove the device from memory. You must use the Remove Device button
found in the Network|Remove window.

Table 2.1 below shows the available device addresses for Relay Outputs and RTDs. If RMM2(s).
They must NOT share the same address as the ACS-PCM2-5 (ACS-CRM) or the C910-485.

TABLE 2.1 AVAILABLE DEVICE ADDRESSES

DEVICE DEVICE TYPE SWITCH SETTING DEVICE ADDRESS

ACS-PCM2-5,

Relay Output/RTD 1–99 1–99

C910-485

RMM2 RTD 0-9 32-41

RMM2 RTD A-F 42-47

2.1.4. MAIN WINDOW

After the first system scan has been completed, tap the Main menu button and the main window
appears.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.8 Main window with one CRM board detected

The Main menu window displays the status of all circuits (relays) that are available in the connected
system. In addition to all the available circuits that are assigned to ACS-PCM2-5/C910-485 relays
there are 5 Monitor Only circuits available (TM-A through TM-E). The monitor only circuits are not
assigned to any relays in the ACS-PCM2-5 panels and do not require any additional hardware.

The circuits may be accessed from this window by tapping anywhere on the row for the desired
circuit. If the circuit is unassigned, tapping on the row will allow you to set the control mode and
parameters. If it is already assigned, tapping the row will allow you to edit the control mode and
parameters.

Tap anywhere on the row for the circuit you wish to set up.

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2.2. SETUP WINDOW

The Setup window is displayed after tapping the circuit on the Main window you wish to configure,
or by tapping the Setup button on the Main menu at the top of the window.

Fig. 2.9 Setup window for unassigned circuit

2.2.1. ASSIGNING CIRCUIT IDENTIFICATION

In this window you will be assigning an ACS-PCM2-5 address and relay number or Temp Monitor
address and providing a name for your circuit.

SETUP WINDOW FIELDS

Address Toggle Button:

This button toggles between the PCM Address and the Temperature Channel.

PCM Address: Displays the ACS-PCM2-5/C910-485 address that was detected from the network
scan. If you enter the Setup screen without selecting a PCM (circuit), the first PCM-relay detected
in your network will be displayed. You may enter the desired PCM and relay number on the setup
window to configure the circuit.

Relay Number: The circuit # label is assigned when scanning the network with the ACS-30 program.
By default each of the five relays are numbered as the CRM number and relay number (e.g. 1-1, 1-2,
1-3, 1-4 and 1-5). The CRM number and relay number are a primary reference for all windows. Once
a circuit is added, you cannot delete it or change its PCM number. To remove the entire PCM, you
must go to the Network|Remove window.

Temp Monitor: Displays an entry field to configure a temperature monitor only channel. Tap the
entry field and select the temperature monitor channel (TM-A to TM-E) you wish to configure. Refer
to Section 4 Temperature Monitor Only Circuits on page 124 for specifics.

ID: A user defined circuit identification text field. The default is “ID X-X” (where X-X is the Circuit
number). Before the circuit is assigned the ID tag is set as “unassigned.”

When selected, a text-editing window appears that works similar to cell phone text messaging.
There are selection keys for uppercase letters, lowercase letters, and special characters. The keypad
portion allows you to enter text by pushing the appropriate keys.

Limit: 40 characters (character strings are truncated on the Main window after 16 characters but
displayed in full on Status and Setup windows)

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.10 ID pop-up window

Circuit

Enabled: The ACS-UIT2 monitors and generates circuit alarms and the ACS-PCM2-5 or

C910-485 controller turns the relay on or off based upon set-up parameters for the selected

control mode and/or RTD inputs.

Disabled: The ACS-UIT2 has disabled the circuit, and does

NOT generate alarms or control

the relay assigned to the circuit. The relay remains in the off position. The circuit is grayed

out in the Main window to show it is

Disabled

Force On: The ACS-UIT2 has turned the circuit on, overriding the control mode, but

generates alarms and enables high temperature cut out.

Force Off: The ACS-UIT2 has turned the circuit off, but generates low temperature and

system alarms.

2.2.2. ASSIGNING CONTROL MODE

In the control mode you will be selecting your application and entering temperature setpoints,
assigning RTDs, alarm parameters and ground-fault protection levels.

Mode: Select the desired control mode from the Mode Select window.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.11 Mode Select window

Follow the window prompts to enter temperature setpoints, assign RTDs, alarm parameters and
ground-fault protection levels. Table 2.2 Control Mode Description and Index lists the ten application
control modes and references where the programming details are described in
Section 3 – Control Mode Configurations

nVent.com | 23

TABLE 2.2 CONTROL MODE DESCRIPTION AND INDEX

CONTROL MODE DESCRIPTION

NVENT RAYCHEM
HEATING CABLES

SECTION
NUMBER

PAGE
NUMBER

UNASSIGN Clears all parameters set for a circuit NA 3.1 52

HWAT Opens HWAT design wizard

HWAT 3.2 52
Variable temperature settings can be assigned using
the 24/7 Scheduler

Frost Heave Freezer frost heave prevention

Variable temperature settings can be assigned using
the 24/7 Scheduler

Floor Heating Floor heating applications

Variable temperature settings can be assigned using
the 24/7 Scheduler

1

RaySol and MI Heating

3.3 58

cables

1

RaySol, MI Heating Cables

3.4 62

and

1

QuickNet Floor Heating

Mats

Pipe Freeze Pipe freeze protection applications XL-Trace 3.5 66

Pipe freeze protection with ambient control XL-Trace 3.5.1 67

Pipe freeze protection with line control XL-Trace 3.5.2 71

Pipe freeze protection with PASC2 control XL-Trace 3.5.3 76

Fuel Oil Fuel oil flow maintenance applications XL-Trace 3.6 81

Fuel oil flow maintenance with ambient control XL-Trace 3.6.1 81

Fuel oil flow maintenance with line control XL-Trace 3.6.2 85

Fuel oil flow maintenance with PASC2 control XL-Trace 3.6.3 90

Greasy Waste/TM Greasy waste and other temperature maintenance

XL-Trace 3.7 95
control
Variable temperature settings can be assigned using
the 24/7 Scheduler1

Roof and Gutter Roof and gutter de-icing applications IceStop and MI heating

3.8 99

cables

Roof and gutter de-icing with external device IceStop and MI heating

3.8.1 99

cables

Roof and gutter de-icing with ambient control IceStop and MI heating

3.8.2 97

cables

Roof and gutter de-icing with bracketed ambient
control

Roof and gutter de-icing with surface temperature
control

IceStop and MI heating

cables

IceStop and MI heating

cables

3.8.3 101

3.8.4 109

Snow Melting Surface snow melting applications 113

Surface snow melting with external device 113

Surface snow melting with ambient control 116

Surface snow melting with surface temperature

120

control

Temperature

Monitors any critical temperature defined by the user N/A 4 124

Monitor
Only
1

Variable temperature setpoint 24/7 Scheduler is described in Appendix 5.2 24/7 Scheduler.

2

Proportional Ambient Sensing Control (PASC) described in related control mode section and Appendix 5.1 Proportional Ambient

Sensing Control (PASC) Control Mode.

nVent.com | 24

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Start Test The Start Test button closes the relay on the ACS-PCM2-5 or C910-485
and energizes the heating cable circuit for 30 minutes to help in commissioning and
troubleshooting. When the Start Test button is tapped, it turns red, and is renamed to Stop
Test. Within the Stop Test window, a count down timer is displayed showing the progress
in the 30 minute test cycle. The relay remains closed for 30 minutes, or until the button is
tapped again.

Fig. 2.12 Start/Stop test

Copy Circuit The Copy Circuit button allows you to assign other available circuit number (circuit) with

identical control parameters.

• Select the circuit containing parameters you wish to copy from the Main window or Setup
window, then tap Copy Circuit

• Highlight the available circuit where you wish to copy the circuit parameters, then tap >>.

Fig. 2.13 Copy Relay window

Once all intended circuits have been moved to the destination circuit box, tap OK.

Note: When circuits are copied, all parameters except RTD association and ID tag are carried to the

new relay position. After the circuit is copied you must associate RTD and enter a new ID tag

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

nVent.com | 25

Fig. 2.14 Circuits Copied message

2.2.3. ASSIGNING AND SHARING RTD CONTROL AND MONITORING

By default, each channel of the ACS-PCM2-5 or C910-485 has an associated RTD input. On any
ACS-CRM board, the first RTD input is automatically coupled with the first relay output; the second
RTD is linked with the second output relay, etc.

The Setup|RTDs window displays the default RTD assignment in the A field. This selection is grayed
out because you cannot alter this default selection.

nVent.com | 26

Fig. 2.15 Setup|RTDs window with Line Control

If no RTD is connected to the input terminals for this circuit, then all four lines can be used to assign
RTDs from elsewhere in the system. However, in the event of a communications or UIT failure, no
RTD input is available and the relay output for this circuit goes to the failsafe mode established in
the Setup|Circuit window.

Up to three additional RTDs can be associated with a given circuit. When the system is operating,
the lowest temperature value from the array of multiple RTDs will be used as the control
temperature.

If no RTD is connected to the input terminals of a given relay, then all four RTD inputs can be used
to assign RTDs from elsewhere in the system. However, in the event of a communications or UIT
failure, no RTD input will be available and the relay output for this circuit will go into its failsafe mode
established in the Setup|Circuit window.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

USING RTDS WITH THE DIFFERENT APPLICATION CONTROL MODES

In certain modes, you have an option of choosing if the circuit is controlled by RTDs that are
measuring line (pipe, slab or surface) temperature, by RTDs that are measuring the ambient
temperature or by using dry contact relays from external moisture controllers (see Table 2.3 RTD
and External Control Functions on page 32 for more detail).

Line and Surface Temperature Control:

RTD assignment will be the same as described in the previous section.

Ambient or PASC Control: RTDs must be assigned for either ambient control or line monitoring

Ambient Control inputs will be used to turn the heating cable on or
off. RTDs in this mode will not trigger any temperature alarms.

Line Monitoring with temperature alarms

Fig. 2.16 Ambient Control or Line Monitor

HWAT Mode: No RTDs are required or can be used for control. However RTDs can be assigned for
line monitoring with temperature alarms.

External Device Control: A controller may be used as external device control in roof & gutter and
snow melting applications or as an external override for other applications. The dry contact output
of the external device is connected to the RTD input on the ACS-PCM2-5 panel or RMM2. For the
C910-485 there are terminals to land the external device, not the RTD input. When the contact
is open the circuit is off and when closed the circuit is powered. Refer to Appendix 5.3 for wiring
instructions.

RTDs may be associated to the circuit for high temperature override. RTDs in this mode will not
trigger any temperature alarms.

External Device Override:

An external device or BMS system with dry contacts may be used to override the local RTD input to
force the circuit on or off. All programmed temperature alarms and high temperature cut out values
will still be active.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

nVent.com | 27

Fig. 2.17 External device RTD window

Mode

Mode

Note: If an RTD is connected to the PCM address it will be used as primary control for the circuit.

TABLE 2.3 RTD AND EXTERNAL CONTROL FUNCTIONS

AMBIENT, PASC, OR

APPLICATION CONTROL LINE/SLAB RTD

EXTERNAL CONTROL

/ OVERRIDE (WIRED

TO RTD INPUT)

Control Monitor Control Override

Hot Water Maintenance

Timed duty cycle — X — —

(HWAT)

Freezer Frost Heave Line/slab sensor X X — —

Floor Heating Line/slab sensing X X — Ext

Pipe Freeze Protection Line sensing X X — Ext

Ambient or PASC1 X X Ext

Fuel Oil Flow Maintenance Line sensing X X Ext

Ambient or PASC1 X X Ext

Greasy Waste

Line sensing X X — —

Temperature Maintenance

Roof and Gutter De-icing External device — X X X

Ambient and

— X X —
Bracketted
Ambient
sensing

Surface sensing X X — —

Surface Snow Melting External Device — X X —

Ambient sensing — X X X

Surface sensing X X — —

Temperature Monitoring

N/A — X — —

Only
1

PASC mode described in Section 3.5.3 Temp Control – PASC Control on page 76

nVent.com | 28

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Assigning RTDs in Monitor only mode

The same process is used to assign RTDs to Monitor Only mode. Any RTD in the system can be
assigned whether from a ACS-PCM2-5 relay number or from a RMM2 module. Theses RTDs do not
have any control function associated with them, however, they can be assigned alarm values.

Assigning additional RTDs to a circuit

RTDs can be assigned to a circuit from ACS-CRM boards or RMM2 modules. To assign the
additional RTDs to a circuit enter the device address and RTD number as listed under your
Network|Device window.

Fig. 2.18 Assigning additional RTDs.

2.2.4. SETUP|ALARM

The Setup|Alarms window lists all of the temperature alarm conditions for line control/monitoring.
The minimum and maximum values for each alarm condition are included for each application
control mode in Section 3.

Fig. 2.19 Setup|Alarms window

2.2.5. SETUP|G.F.

The Setup|G.F. window configures ground-fault alarm and trip values for the circuit. The alarm/trip
conditions are latching and must be manually reset.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

nVent.com | 29

Fig. 2.20 Setup|G.F. window

2.2.6. SETUP|VOLTAGE

The Setup|Voltage windows allows the voltage powering the heating cable to be set. This is the
voltage the ACS-30 uses to calculate the energy consumed by the heating cable circuit. The
C910-485 measures the applied voltage so this field is not required for energy usage calculations.

Fig. 2.21 Setup|Voltage window

Tapping the Voltage Field opens a voltage selection screen with choices of 120, 208, 240 or 277 V
for standard ACS-PCM2-5 power control panels . The ACS-30 system can also be programmed for
480 V and 600 V single and three phase supply, however, these require custom built PCM panels.
The C910-485 cannot be used for applications greater than 277 V or three phase supplies.

nVent.com | 30

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.22 Voltage selection window

2.2.7. SETUP|MAINT.

The Setup|Maint. window enables a heating cable circuit diagnostic feature to be engaged on a
automatic schedule. This feature powers the circuit for 2 minutes when not in demand to ensure the
circuit, RTD or communications have not been damaged and will be working when needed. The user
can select the time of day the test will be conducted.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the
circuit is enabled.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.23 Setup|Maint. window

The interval field opens a window where the timed interval of this diagnostic can be selected.

Range: Never, daily, weekly or monthly
Default: Never

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2.3. STATUS|CIRCUIT WINDOW

nVent.com | 32

Fig. 2.24 Power Cycle Interval selection window

The Status|Circuit window displays the status information for individual circuits. Data in the status
menus cannot be changed.

Fig. 2.25 Status|Circuit window

The fields and displays in the Status|Circuit provide the following information:

PCM Address and Relay Number

Enter the PCM Address and Relay Number to view the status of a
specific circuit.

ID Displays the ID tag defined in Setup/Circuit window.
Mode Displays the Control Mode selected in Setup|Circuit window.

Alarm Reset In normal state, the Alarm Reset button is grayed out. If a latching

alarm occurs, the Alarm Reset blinks orange/red. The alarm
cannot be reset until the fault has been cleared.

Line Temp The Line Temp displays the temperature the ACS-UIT2 is currently

measuring. If more than one RTD is connected to a circuit, the
system displays the lowest Temp of all the RTDs assigned to
that circuit.

Status Displays the relay output status (On, Off, or Trip) of the EMR. If

communication is lost to the output device, a red COMM appears
and alarms.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

2.4. STATUS|RTDs WINDOW

G.F. Displays the ground-fault current for the circuit.

Current Displays the heating cable amperage of the circuit when the relay

output is on.

Energy Displays the power currently consumed by the heating cable (Watts).

Voltage Display the system voltage entered on the ACS-UIT2 or measured

by the C910-485 Controller.

The data in the Control Temp, G.F. and Current windows are displayed in color to identify their state:

Color Code State

Black Circuit is off

Green Within normal range of setup parameters

Red In alarm condition

Orange Temperature is not within setpoint plus deadband range

Blinking Red/Orange A latching alarm event has occurred

The Status|RTDs window lists the RTD devices and numbers assigned to the selected circuit, along
with the last reported temperature from each RTD. Data in this status window cannot be changed.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.26 Status|RTDs window

For a circuit in the external device control mode the RTD status screen will indicate whether the dry
contact in the device are closed (powering the circuit) or open (turning the circuit off).

Fig. 2.27 Status|RTDs window - external device

nVent.com | 33

2.5. STATUS|MIN/MAX WINDOW

The Status|Min/Max window displays an historical record of minimum and maximum values
recorded since the last reset time.

Fig. 2.28 Status|Min/Max window

The Status|Min/Max window provides the following controls:

Control Temp

Max The highest temperature reported by any line RTD associated with
the circuit since the last reset time.
Min The lowest temperature of any line RTD associated with the circuit
since the last reset time.
Max GF Current The highest ground-fault value recorded for the circuit since the
last reset time

Max Current The highest current recorded for the circuit since the last reset.
Reset Button Clear all Min/Max values and begins updating Min/Max fields with

new values.

nVent.com | 34

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

2.6. STATUS|ENERGY WINDOW

The Status|Energy window displays the power consumed by the heating cable circuit since the last reset.

The energy consumption is recorded every hour in the ACS-30 system which can store data fora
maximum of 5 years. After that time the first year data is deleted from the database.

The energy consumption database can be downloaded as XML file in order store or statistically
analyze the data. See Appendix 5.6 for more information.

Different views are available and selectable by a dedicate menu:

Fig. 2.29 Status|Energy window window View selection

The hourly view plots the energy consumption over the selected day with a time interval of one hour.
The actual and the previous 7 days can be selected.

Fig. 2.30 Status|Energy window (Hourly view)

The Total value displayed (bottom/left position) represents the total energy consumption of the
circuit since the last reset, while the Energy Consumption value (on the plot’s headline) represents
the consumption for the shown view.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

nVent.com | 35

Fig. 2.31 Status|Energy window Day selection (Hourly view)

The daily view plots the energy consumption over the selected month & year with a time interval of
one day.

Fig. 2.32 Status|Energy window (Daily view)

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Fig. 2.33 Status|Energy window Year selection (Daily view)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.34 Status|Energy window Month selection (Daily view)

The monthly view plots the energy consumption over the selected year with a time interval of one month.

Fig. 2.35 Status|Energy window (Monthly view)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.36 Status|Energy window Year selection (Monthly view)

The yearly view plots the energy consumption over the last 5 years with a time interval of one year.

nVent.com | 37

2.7. STATUS|MAINT. WINDOW

Fig. 2.37 Status|Energy window (Yearly view)

The Status|Energy window provides the Reset Button which clears the logged kWh and begins
updating the field with new values.

The Status|Maint. window displays the cumulative time in hours the heating cable has been powered
and the number of cycles the EMR has turned on and off for the selected circuit. If the Power Cycle
feature is turned on the date and time of the last and next power cycle is displayed. The power cycle
test energizes the heating cable selected for 2 minutes to verify it is in working order.

nVent.com | 38

Fig. 2.38 Status|Maint. window

The Status|Maint. window provides the following controls:

Heater Time On Total time the heating cable has been energized since it was last
Reset.
Reset Heater Time Resets heating cable time to 0, and begins updating the field with
new values.
Relay Cycle Count Total number of times the EMR has switched on since it was last
reset.

Reset Relay Cycle Count Resets the Relay Cycle count to 0, and cycle counts begin again.
Power Cycle Test Shows the time of the last automatic power cycle test and when

the next test will be conducted.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

2.8. EVENTS WINDOW

The Events window displays a chronological history of all events and alarms. It retains the most
recent 2000 entries; after 2000 entries are recorded, the oldest entries are discarded as new entries
are added.

Fig. 2.39 Events window

The Events status listing window provides the following information:

Time By taping the Time column heading, the display of times of the

events or alarms changes to descending or ascending order based
on time of occurrence.

Circuit By taping the circuit heading, the display of events or alarms

is sorted by the circuit number. Circuits are first displayed
in ascending order. Taping the circuit again toggles between
ascending or descending order.

Events, Press for Alarms By taping the Events heading, the Events display filters events or

alarms by type. Time and Circuit column headings can then be

used to further sort the selected events or alarms for display.
Note: The program automatically skips an alarm type if no alarms
of that type exist).

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

TABLE 2.4 ALARM TYPE HEADINGS AND DESCRIPTIONS

ALARM TYPE/
HEADINGS

DESCRIPTION

Comm Alarm ACS-UIT2 display lost communication with an ACS-PCM, C910-485

and/or RMM2 device(s).

Fail Safe Alarm Control mode of circuit has been switched to Fail Safe control mode.

Ground-Fault Alarm Heating cable’s ground-fault current went above high ground-fault

current alarm setting.

Ground-Fault Trip Heating cable’s ground-fault current went above the ground-fault trip

setting.

High Temp RTD temperature went above high temp alarm setting.

High Temp Cut-Out RTD temperature went above high temp cut-out alarm setting.

nVent.com | 39

TABLE 2.4 ALARM TYPE HEADINGS AND DESCRIPTIONS

Low Temp RTD temperature went below low temp alarm setting.
Relay Failure Alarm

• EMR was commanded to turn off. However, a heating cable
current was still being detected. This condition can indicate a
failed contactor (stuck on).

• EMR was commanded to turn on. However, a heating cable
current was not detected. This condition can indicate a failed
contactor (stuck off) or no line voltage.

RTD Failure Open or shorted RTD detected

TABLE 2.5 EVENTS AND DESCRIPTIONS

EVENT DESCRIPTION

Alarm Ack Date and time stamps when an alarm was acknowledged.

Comm Alarm

Comm OK Communication with device/s was restored.

Events Cleared Date and time stamps when Events menu was cleared in

Fail Safe Alarm Control mode of circuit has been switched to Fail Safe control mode.

Fail Safe OK At least one valid RTD value was restored, allowing normal control

Ground-Fault Alarm Heating cable’s ground-fault current has exceeded Ground-Fault

Ground-Fault OK Ground fault returned to acceptable range.

Ground-Fault Trip Heating cable’s ground-fault current has exceeded Ground-Fault Trip

Ground-Fault Trip OK Ground-fault current returned to acceptable range and Alarm Reset

Heating cable Time Reset 

High Temp RTD temperature has exceeded high temp alarm limit for circuit.

High Temp Cut-Out OK RTD temperature return to acceptable range.

Low Temp RTD temperature has dropped below the low temp alarm limit for circuit.

Normal The alarm condition noted has been cleared.

Relay Cycle Reset 

Relay Failure Alarm

RAYCHEM device has been
interrupted.

System|Maint. window.

to resume.

Alarm limit for circuit.

limit for circuit and has disabled the contactor or SSR.

Button was pushed.

• EMR was commanded to turn off. However, a heating cable
current was still being detected. This condition can indicate a
failed contactor (stuck on).

• EMR was commanded to turn on. However, a heating cable
current was not detected. This condition can indicate a failed
contactor (stuck on).

Relay OK Heating cable current returned to 0 when EMR was commanded to

be off. This indicates EMR is working properly.

RTD OK RTD failure indications (open or short) returned to acceptable range.

RTD Failure 

System Restart ACS-30 system has restarted at time noted.

Temp OK Control Temp returned to acceptable range.

nVent.com | 40

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

TABLE 2.6 COLOR CODING OF EVENTS AND ALARMS

Color Description

Black All events

Orange Alarm that has been acknowledged.

Red In alarm condition and has not been acknowledged.

Blinking Red/Orange Latching alarm condition which requires reset in the Status|Circuit

2.9. NETWORK|RELAYS WINDOW

The Network|Relays window lists all the available output devices and relay numbers.

window.

2.10. NETWORK|RTDS WINDOW

Fig. 2.40 Network|Relays window

The Network|RTDs window lists all the available RTD addresses. Tap the desired RTD connected to
the system on the left side of the screen and the right side of the window shows where the RTD has
been assigned.

Fig. 2.41 Network|RTDs window

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

nVent.com | 41

2.11. NETWORK|MAINT. WINDOW

This Network|Maint. window shows the communication success rate with all of the devices
connected to the RS-485 network. This is helpful in troubleshooting the RS-485 network.

Fig. 2.42 Network|Maint. window

2.12. NETWORK|REMOVE WINDOW

The Network|Remove window is Level 2 password-protected. Once accessed, it allows you to
remove device addresses for ACS-PCM2-5, C910-485 and RMM2 from memory.

nVent.com | 42

Fig. 2.43 Network|Remove window

The Network|Remove window provides the following controls:

Device Address Enter the device address you wish to removal from memory.
Remove Removes entered device address from memory.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

2.13. SYSTEM|RELAYS WINDOW

2.14. SYSTEM|COMM WINDOW

The System|Relays window lets you configure alarm relays.

Fig. 2.44 System|Relays window

There are three independent alarm relays in the ACS-UIT2 that can be used for remote annunciation
of alarms. Each relay can be programmed for a specific alarm type, multiple alarm types, or none. If
“Any Alarm” is chosen for a relay, any alarm condition will activate that relay.

The System|Comm window lets you set up communications with host systems.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 2.45 System|Comm window

The ACS-UIT2 can be connected to a Building Management System (BMS) or host computer using
an RS-485, RS-232, or 10/100Base-T Ethernet connection. All data and setup options are accessed
with communications that follow the Modbus (RTU/Modbus/TCP) protocol. To enable BMS
communications, please refer to the ACS-UIT2 Modbus Protocol document (H58685). ProtoNode
multi-protocol device servers are available through nVent. The ProtoNode is pre-programmed with
the Modbus mapping for ACS-30 and C910-485 controllers for BACnet, MetaSys and LonWorks
protocols.

IP Address/Subnet Mask

By default, the IP Address and Subnet Mask are automatically inserted. However, if the IP Address
or Subnet Mask needs to be changed, click on the IP Address or Subnet window and then on the
LAN91C1111 icon.

nVent.com | 43

To enter an IP address and Subnet Mask manually, click on the IP Address tab, select “Specify an IP
Address,” enter the IP Address, the Subnet Mask, and Default Gateway.

Note: The set-up parameters above should be provided by your network administrator. The “Name
Server” tab is not applicable for this application.

Modbus Address

Each ACS-UIT2 must have a unique Modbus address which is set by you. The BMS or host
computer can communicate with up to 247 separate ACS-UIT2 units by using Modbus protocol.

Range: 1–247

Default: 1

Baud Rate

Allows you to select the baud rate of the external communication port.

Selection: 2400, 4800, 9600, 19200, 38400, 57600

Default: 9600

Serial Port Mode

This activates a window which allows selection of RS-232 or RS-485 ports. This selects the serial
communication mode for the host port.

Selection: RS-232, RS-485

Default: RS-485

Transmit Delay

This sets the time the ACS-UIT2 will wait after it receives a message before it replies.

Range: 0–5000 milliseconds

Default: 0

Receive Timeout

This sets the time the ACS-UIT2 waits after last character is received before it determines that the
message has ended.

Range: 0–1000 milliseconds

Default: 50

Read/Write Port

Defines which communication protocol (i.e. serial or Ethernet) has BOTH read and write data
access capabilities. By default, the communication medium NOT selected has read-only data
access capabilities.

Options: Serial, Ethernet

Default: Serial

nVent.com | 44

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

2.15. SYSTEM|PASSWORD WINDOW

The System|Password window lets you set up passwords for Level 1 and Level 2.

Fig. 2.46 System|Password window

The System|Password window provides the following controls:

Level 1 Allows setup of all configuration windows except for the
System|Maint. window. This Level 1 password is left “blank” from
the factory; however, it can be set to a new designated password.
If a Level 1 password is chosen, the “Main Menu” timer value
determines how long the password remains active before it has to
be re-entered. The password is limited to 40 characters.
Default: Level 1 disabled

New Password Enter the user-defined password.
Save New Password Confirms password has been saved.
Level 2 Allows access to System|Maint. window, which permits clearing of

Events and program exit.
Default password: 1234
Note: Change the Level 2 password after commissioning.

Old Password 1234

New Password Enter your user-defined Level 2 password. The password is limited

to 40 characters.

Save New Password Confirms password has been saved.
Note: Save and protect the Level 2 password in a secure location.
Contact a nVent representative for lost password recovery.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

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2.16. SYSTEM|MAINT. WINDOW

(Level 2 Password Required) This window allows for clearing the Events List and to exit the program.

Fig. 2.47 System|Maint. window

The System|Maint. window provides the following controls:

Clear Events List Clears all events and alarms history.
Note: By clearing the event, all the events and alarms history
information for all circuits is lost. If the program exit is chosen,
heating cables are no longer monitored.
Exit ACS-UIT2 Allows user to exit ACS-30 program. This ends the monitoring of
all circuits.
Note: Make sure you disable the Watch Dog timer located on the
side of the ACS-UIT2. Otherwise, the program will continually
attempt to restart the ACS-UIT2 program.

WARNING: Qualified nVent Personnel Only. It is recommended that only nVent personnel exit the
ACS-UIT2 program.

nVent.com | 46

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

3. SECTION 3 - CONTROL MODE CONFIGURATIONS

**Schedule Sub Routine

Depending on Control Mode that was selected, the configuration sub menu windows will query for
the necessary inputs required for the circuit to function. Figure 3.1 presents a flow chart to help
visualize the programming steps and required input for each of the control modes. This section will
present each control mode and guide you through the steps and windows required.

End

N

End

N

MODE

SELECT

U

P F

P

F

O/F

M

F

F H

G

W  T

M

F H

HWAT

HWAT Wizard

Heating cable: Y2 or R2
Voltage: 208, 240, 277
Ambient: 60°F to 90°F
Pipe material: Metal/plastic
Maintain and Economy temp

Circuit

already

assigned?

Sensing

control:

Ambient, PASC

or Line?

Enter: –Maintain
–Deadband
–Fail safe

Enter:

-Ambient
Override

Assign duty cycle

Are you

certain you

Y

wish to unassign

the circuit?

PASC

Ambient/Bracketed ambient

Line

Set point mode

External Device

Enter:
Minimum ambient temp
Minimum pipe size

Set point mode

Variable

Variable

Economy**

set point

Constant

Y

Clear circuit data

Enter:
–Set point
–Deadband
–Fail safe

Constant

Economy

temperature

set point

or off.

N

Monitoring

RTD used?
If no then

goto

end

Set calendar

schedule**

Assign

Y

RTD*

End

Assign

RTD*

Set calendar

schedule**

Assign

RTD*

RTD*

End

Enter
Ground-fault
level, system
voltage and
power cycle

frequency.

Enter
Ground-fault

level, system

voltage and

power cycle

frequency.

End

Enter

Ground-fault

level and

power cycle

frequency.

End

S

S 

R  G

D

* RTD and external device override or control Sub Routine

Fig. 3.1 Control Mode Programming flow chart

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Sensing

control:

External device,

Ambient or

Surface

temp?

Ambient temp

Surface temp

Enter:

-Set point

-Fail safe

Enter:

-Deadband

-High Temp
Override

-Power off
delay

Assign
RTD* or
external

device

input

End

Enter
Ground-fault
level, system
voltage and

power cycle

frequency.

nVent.com | 47

3.1. UNASSIGN MODE

3.2. HWAT MODE

The UNASSIGN mode clears all parameters set for a circuit so that it may be reassigned to a new
control mode.

When the HWAT control mode is selected, the HWAT Design Wizard is initiated. The design wizard prompts
you for information necessary to maintain the hot water piping system at the desired temperature.

3.2.1. ENTER SYSTEM INFORMATION

Select Cable Type:

Select the heating cable type being used with this circuit: HWAT-Y2 or HWAT-R2

Fig. 3.2 Select cable type

Select Voltage Input:

Select the supply voltage: 208, 240 or 277 V

Fig. 3.3 Select voltage input

Enter Ambient Temperature:

Enter the estimated indoor ambient temperature where the pipe is situated.

Ambient Temperature

nVent.com | 48

Range: 60°F (16°C)–90°F (32°C)
Default: 70 (21°C)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.4 Enter ambient temperature

Select Pipe Type:

Select the pipe type: Metal or Plastic. The material the heated pipe is made of affects the power
output of the HWAT self-regulating heating cables. Enter the pipe material.

Fig. 3.5 Select pipe type

Select Setpoint Mode:

Select the setpoint: Constant or Variable. Constant will allow a single temperature setpoint for your
system. Variable allows you to set different setpoints using the 24/7 Scheduler. Refer to Appendix

5.2 24/7 Scheduler on page 127 for detailed information.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

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Fig. 3.6 Select setpoint mode

Enter Temperature Setpoints:

Enter the temperature setpoints that you want to maintain the hot water pipe:

• Minimum setpoint temperature: 100°F

• Maximum setpoint temperatures are dependant upon the applied voltage and ambient

temperature (Table 3.1)

nVent.com | 50

Fig. 3.7 Enter temperature setpoint

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

TABLE 3.1 MAXIMUM SETPOINT TEMPERATURE FOR HWAT CONTROL MODE

HWAT-Y2

AMBIENT 208 V 240 V 277 V

60ºF 115ºF 120ºF 120ºF

70ºF 120ºF 125ºF 125ºF

80ºF 125ºF 125ºF 130ºF

90ºF 125ºF 130ºF 135ºF

HWAT-R2

AMBIENT 208 V 240 V 277 V

60ºF 135ºF 140ºF 140ºF

70ºF 140ºF 140ºF 145ºF

80ºF 145ºF 145ºF 150ºF

90ºF 145ºF 150ºF 150ºF

Default: HWAT-Y2: 115°F (46°C) HWAT-R2: 125°F (52°C)

At this point the HWAT design wizard is complete and the HWAT circuit configuration window is
displayed.

3.2.2. CONFIGURING HWAT

After completing the HWAT design wizard the Setup HWAT window appears where you can adjust
the input variables established in the design wizard and enter access additional menu windows.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.8 Setup|HWAT window

Economy Temperature (optional):

This value represents the temperature that you want the pipe to maintain when in economy mode.
This input is only accessible if the setpoint mode is set to Variable which applies the temperature
weekly setpoint 24/7 Scheduler function described in Appendix 5.2 24/7 Scheduler on page 127.

Enter the Economy temperature

Range 100°F (38°C) to less than the maintain temperature

Default 105°F (41°C)

Setpoint Mode:

Allows you to configure how the scheduling is done over a weekly timed calendar with 48 1/2-hour
program intervals per day available.

nVent.com | 51

Constant will allow a single temperature setpoint for your system.

Variable allows you to set different setpoints using the 24/7 weekly scheduler

See Appendix 5.2 24/7 Scheduler on page 127.

Setpoint options

HWAT-Y2: Maintain, economy or off

HWAT-R2: Maintain, economy, off or heat cycle over a weekly timed calendar with 48 1/2-
hour program intervals per day available.

Schedule:

Opens the weekly scheduler. See Appendix 5.2 24/7 Scheduler on page 127 for more information.

Power Factor:

The factor is used to decrease or increase the final pipe temperature. Increasing this value above
100% will result in a longer duty cycle, while adjusting it lower than 100% will decrease the duty
cycle.

Range: 40%–160%

Default: 100%

Assigning RTDs

RTDs are not required for HWAT system control. If you wish to use RTDs to monitor pipe or water
heater temperatures tap Setup|RTDs window and enter the device address and RTD number. For
detailed information on the Setup|RTD window refer to Section 2.2.3 Assigning and Sharing RTD
Control and Monitoring on page 30.

nVent.com | 52

Fig. 3.9 Setup|RTDs window (HWAT)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Assigning Temperature Alarms

Once RTDs have been assigned to the circuit high and low temperature alarms may be set. The
alarm button will only appear if a RTD has been assigned to the circuit.

Fig. 3.10 Setup|Alarms window (HWAT)

HIGH LINE TEMP ALARM:

If any RTDs assigned to a circuit measures a temperature above this threshold, the ACS-UIT2
generates an alarm. The limit can be set for any temperature value you desire for your application
within the range allowed.

Range: Maintain setpoint plus 10°F (6°C) to 190ºF (88ºC)
Default: 190°F (88°C)

LOW LINE TEMP ALARM:

If any RTDs assigned to a circuit measures a temperature below this threshold, the ACS-UIT2
generates an alarm.

Range: 40ºF (4ºC) to Maintain temperature
Default: 40°F (4°C)

TEMPERATURE ALARM FILTER:

This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that the alarm condition
continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

HIGH LINE TEMP CUT-OUT:

If any RTDs assigned to a circuit measures a temperature above this threshold, the ACS-UIT2
generates an alarm and the relay output is turned off. If the high line temperature drops below this
threshold minus the deadband, the output is turned on and normal duty cycle control is resumed.

Range: High Temperature Alarm value plus 1°F (1°C) to 200ºF (93ºC)

Default: 200°F (93°C)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

nVent.com | 53

HIGH LINE TEMP CUT-OUT ENABLE/DISABLE:

Enables or disables the high line cut-out capability. When enabled, the ACS-UIT2 alarms and the
output relay turns OFF if any RTDs exceeds the cut-out value for the alarm filter time period. If the
high line temp cut-out is disabled, the relay output will continue to function normally without the
high temperature cut-out feature.

Options: Enable or Disable

Default: Enable

Assigning Ground-Fault Alarm and Trip Levels

The Setup|G.F. window allows you to set the alarm and trip levels.

Fig. 3.11 Setup|G.F. window (HWAT)

Input the Ground-Fault Alarm and Ground-Fault Trip:

GROUND-FAULT ALARM:

When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

GROUND-FAULT TRIP:

When the ground-fault current exceeds this level the ACS-PCM2-5 or C910-485 turns off the
circuit relay.

Range: 10–200 mA

Default: 30 mA

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

3.3. FROST HEAVE MODE

The Frost Heave control mode prompts you to enter the control parameters for your Freezer Frost
Heave Prevention application.

Fig. 3.12 Setup|Frost Heave window

SLAB TEMP SETPOINT:

The slab temp setpoint is the desired maintain temperature for the freezer floor. Based on the
measured control temperature, the ACS-UIT2 will switch the relay output to maintain the system at
the desired setpoint.

Range: 20°F (-7°C)–50°F (10°C)

Default: 40ºF (4°C)

DEADBAND:

If the control temperature is above the setpoint temperature plus deadband, the relay output is
turned off. If the control temperature is below the setpoint temperature, the output is turned on.

Range: 1°F (1°C)–10°F (6°C)

Default: 5ºF (3°C)

FAIL SAFE:

The Fail Safe control button turns the power on or off to the heating cable if the circuit loses all valid
RTDs. When the last remaining sensor for control fails (or communication with the sensor is lost),
the ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-UIT2 signals the alarm has been cleared,
returns the circuit to its normal control mode, and records both of these events.

Options: Power On or Power Off

Default: Power On

SCHEDULE:

Tapping on this button will bring up the Scheduler. See Appendix 5.2 24/7 Scheduler on page 127
for more information.

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ASSIGNING RTDS

In this mode you have the option of setting up to four RTDs with the ACS-PCM2-5, or 2 RTD's
with the C910-485, for slab sensing. For detailed information on the Setup|RTD window, see 2.2.3
Assigning and Sharing RTD Control and Monitoring on page 30.

Fig. 3.13 Setup|RTDs window (Frost Heave)

ASSIGNING TEMPERATURE ALARMS

Once RTDs have been assigned to the circuit the alarm button appears then high and low
temperature alarms may be set.

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Fig. 3.14 Setup|Alarms window (Frost Heave)

HIGH LINE TEMP ALARM:

If any RTDs assigned to a circuit measures a temperature above this threshold, the ACS-UIT2
generates an alarm. The limit can be set for any temperature value you desire for your application
within the range allowed.

Range: Maintain setpoint plus 5°F (3°C) to 90ºF (32°C)

Default: 90°F (32°C)

LOW LINE TEMP ALARM:

If any RTDs assigned to a circuit measures a temperature below this threshold, the ACS-UIT2
generates an alarm.

Range: 0ºF (-18ºC) to Maintain setpoint

Default: 35°F (2°C)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Note: One RTD must be connected to the circuit for this control mode to function or an RTD failure
alarm will be announced.

TEMPERATURE ALARM FILTER:

This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that the alarm condition
continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

HIGH LINE TEMP CUT-OUT:

If any RTDs assigned to a circuit measures a temperature above this threshold, the ACS-UIT2
generates an alarm and the relay output is turned off. If the high line temperature drops below this
threshold minus the deadband, the output is turned on and normal duty cycle control is resumed.

Range: High Temperature Alarm value plus 10°F (6°C) to 100ºF (38ºC)

Default: 100°F (38ºC)

HIGH LINE TEMP CUT-OUT ENABLE:

Enables or disables the high line temp cut-out capability. When enabled, the ACS-UIT2 alarms and
the output relay turns OFF if any RTDs exceeds the cut-out value for the alarm filter time period. If
the high line temp cut-out is disabled, the relay output will continue to function normally without the
high temperature cut-out feature.

Options: Enable or Disable

Default: Enable

ASSIGNING GROUND-FAULT ALARM AND TRIP LEVELS

The Setup|G.F. window allows you to set the alarm and trip levels.

Fig. 3.15 Setup|G.F. window (Frost Heave)

Input the Ground-Fault Alarm and Ground-Fault Trip:

GROUND-FAULT ALARM:

When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Range: 10–200 mA

Default: 20 mA

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GROUND-FAULT ALARM:

When the ground-fault current exceeds this level the ACS-PCM2-5 turns off the circuit relay.

Range: 10–200 mA

Default: 30 mA

ASSIGNING CIRCUIT VOLTAGE

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

Fig. 3.16 ISetup|Voltage window (Frost Heave)

INPUT THE CIRCUIT VOLTAGE

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485

measures line voltage, this field does not appear.

Default: 208 V

ASSIGNING POWER CYCLE TEST

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the
circuit is enabled.

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Fig. 3.17 Setup|Maint. window (Frost Heave)

Input the start time and frequency for the Power Cycle test:

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

3.4. FLOOR HEATING MODE

POWER CYCLE START TIME: The time of day to start the Power Cycle test

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

POWER CYCLE TEST INTERVAL: The frequency to run the Power Cycle Test

Range: Never, Daily, Weekly and Monthly

Default: Never

The Floor Heating control mode prompts you to enter the control parameters for a Floor Heating
application.

Fig. 3.18 Setup|Floor Heating window

Floor Temperature Setpoint: The slab setpoint is the desired maintain temperature for the floor.
Based on the measured control temperature, the ACS-UIT2 will switch the relay output to maintain
the system at the desired setpoint.

Range: 60°F (16°C)–110°F (43°C)

Default: 83ºF (28°C)

Economy Temperature (optional):

This value represents the temperature that you want the pipe

to maintain when in economy mode. This input is only accessible if the Setpoint Mode is set to
Variable which applies the temperature setpoint scheduler function described in Appendix 5.2 24/7
Scheduler on page 127.

Enter the Economy temperature

Range: 60°F (16°C)–Maintain

Default: 68°F (20°C)

Deadband:

If the control temperature is above the setpoint temperature plus deadband, the relay

output is turned off. If the control temperature is below the setpoint temperature, the output is
turned on.

Range: 1°F (1°C)–10°F (6°C)

Default: 5ºF (3°C)

Fail Safe:

The Fail Safe control button turns the power on or off to the heating cable if the circuit

loses all valid RTDs. When the last remaining sensor for control fails (or communication with the
sensor is lost), the ACS-UIT2:

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• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-UIT2 signals the alarm has been cleared,
returns the circuit to its normal control mode, and records both of these events.

Options: Power On or Power Off

Default: Power On

Ambient Override: The ambient override allows you to turn off the system when the ambient
exceeds a pre-established temperature.

Range: 40ºF (13ºC)–100ºF (38ºC)

Default: 55ºF (13ºC)

External Override: The dry contacts from a BMS system or external device may be assigned to the
circuit to de-energize the circuit to save power when it is not needed. All temperature and system
alarms are still active. Refer to Appendix 5.3.

Schedule: Tapping on this button will bring up the Scheduler. See Appendix 5.2 24/7 Scheduler on
page 127 for more information.

ASSIGNING RTDS

Tap Setup|RTDs window to assign RTDs after the control mode and parameters have been set.

In this mode you have the option of setting up to four RTDs for floor sensing. For detailed
information on the Setup|RTD window refer to 2.2.3 Assigning and Sharing RTD Control and
Monitoring on page 30.

Input from an external dry contact may also be assigned to override the system. Refer to Appendix
Section 5.3, page 130 for further details.

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Fig. 3.19 Setup|RTDs window (Floor Heating)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

ASSIGNING TEMPERATURE ALARMS

Once RTDs have been assigned to the circuit the alarm button appears then high and low
temperature alarms may be set.

Fig. 3.20 Setup|Alarms window (Floor Heating)

High Line Temp Alarm:

If any RTDs assigned to a circuit measures a temperature above this

threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

Range: Maintain setpoint plus 10°F (6°C) to 140°F (60ºC)

Default: 140°F (60°C)

Low Line Temp Alarm:

If any RTDs assigned to a circuit measures a temperature below this

threshold, the ACS-UIT2 generates an alarm.

Range: 40ºF (4ºC)–60°F (16°C)

Default: 40°F (4°C)
Note: One RTD must be connected to the circuit for this control mode to function or an RTD failure
alarm will be announced.

Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that
the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm and the relay output is turned off. If the high line
temperature drops below this threshold minus the deadband, the output is turned on and normal
duty cycle control is resumed.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Range: Maintain setpoint plus 10°F (6°C) to 150ºF (65ºC)

Default: 150°F (65ºC)

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High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out capability.
When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds the cut-out
value for the alarm filter time period. If the high line temp cut-out is disabled, the relay output will
continue to function normally without the high temperature cut-out feature.

Options: Enable or Disable

Default: Enable

ASSIGNING GROUND-FAULT ALARM AND TRIP LEVELS

The Setup|G.F. window allows you to set the alarm and trip levels.

WARNING: Shock Hazard. National electrical codes require 5-mA, Class A ground-fault protection
devices to be installed when electric floor heating is used in kitchens and baths. The ACS-3O does
not provide 5-mA ground-fault protection. For these applications, a 5-mA class A GFCI must be
installed in the power distribution panel.

Fig. 3.21 Setup|G.F. window (Floor Heating)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

Ground-Fault Trip: When the ground-fault current exceeds this level the ACS-PCM2-5 turns off the
circuit relay.

Range: 10–200 mA

Default: 30 mA

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

ASSIGNING CIRCUIT VOLTAGE

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

Fig. 3.22 Setup|Voltage window (Floor Heating)

INPUT THE CIRCUIT VOLTAGE

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485

measures line voltage, this field does not appear.

Default: 208 V

ASSIGNING POWER CYCLE TEST

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the
circuit is enabled.

Fig. 3.23 Setup|Maint. window (Floor Heating)

Input the start time and frequency for the Power Cycle test:

Power Cycle Start Time: The time of day to start the Power Cycle test

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

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3.5. PIPE FREEZE MODE

Power Cycle Test Interval: The frequency to run the Power Cycle Test

Range: Never, Daily, Weekly and Monthly

Default: Never

The Pipe Freeze control mode prompts you to enter the control parameters for a Pipe Freeze
Protection application.

In this mode, you will be given three different control method options: Ambient, Line and PASC.

3.5.1. TEMP CONTROL – AMBIENT CONTROL

Fig. 3.24 Pipe Freeze Temperature Ambient Control window

The Temp Control window allows you to select the temperature control mode to Ambient Control,
Line Control or PASC. This option depends on where the controlling RTD inputs are situated and
utilized: either measuring the temperature of the environment surrounding the pipe (ambient), or
directly on the pipe itself (line). Tap: Ambient

Fig. 3.25 Setup|Pipe Freeze Ambient Control window

Setpoint Temperature: The setpoint temperature is the desired maintain temperature for the water
pipe. Based on the measured control temperature, the ACS-PCM2-5 will switch the relay output to
maintain the system at the desired setpoint.

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Range: 35°F (2ºC)–50ºF (10ºC)

Default: 40ºF (4°C)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Deadband: If the control temperature is above the setpoint temperature plus deadband, the relay
output is turned off. If the control temperature is below the setpoint temperature, the output is
turned on.

Range: 1°F (1°C)–10°F (6°C)

Default: 5ºF (3°C)

Fail Safe: The Fail Safe control button turns the power on or off to the heating cable if the circuit
loses all valid RTDs.

When the last remaining sensor for control fails (or communication with the sensor is lost), the
ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-30 controller signals the alarm has been
cleared, returns the circuit to its normal control mode, and records both of these events.

Range: Power On or Power Off

Default: Power On

External Override: The dry contacts from a BMS system or external device may be assigned to the
circuit to de-energize the circuit to save power when it is not needed. All temperature and system
alarms are still active.

ASSIGNING RTDS

When in Ambient Control mode you must have one RTD assigned as ambient control. The
remaining three RTDs may be assigned to ambient control or line monitor. For detailed information
on the Setup|RTD window refer to 2.2.3 Assigning and Sharing RTD Control and Monitoring on
page 30. Input from an external dry contact may also be assigned to override the system. Refer to
Appendix Section 5.3, page 130 for further details.

Fig. 3.26 Setup|RTDs window (Pipe Freeze Ambient Control)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

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ASSIGNING TEMPERATURE ALARMS

Once RTDs have been assigned to the circuit high and low temperature alarms may be set.

Note: Temperature alarms can only be associated to line monitoring RTDs.

Fig. 3.27 Setup|Alarms window (Pipe Freeze Ambient Control)

High Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

Range: 100°F (38°C)–190°F (88ºC)

Default: 190°F (88ºC)

Low Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature below this
threshold, the ACS-UIT2 generates an alarm.

Range: 33ºF (1ºC) to maintain setpoint

Default: 33°F (1ºC)

Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that
the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out:

If any RTDs assigned to a circuit measures a temperature above this

threshold, the ACS-UIT2 generates an alarm and the relay output is turned off. If the high line
temperature drops below this threshold minus the deadband, the output is turned on and normal
duty cycle control is resumed.

Range: 110°F (43°C)–200ºF (93ºC)

Default: 200°F (93ºC)

High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out capability.
When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds the cut-out
value for the alarm filter time period. If the high line temp cut-out is disabled, the relay output will
continue to function normally without the high temperature cut-out feature.

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Options: Enable or Disable

Default: Enable

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Assigning Ground-Fault Alarm and Trip Levels

The Setup|G.F. window allows you to set the alarm and trip levels.

Fig. 3.28 Setup|G.F. window (Pipe Freeze Ambient Control)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

Ground-Fault Trip: WHEN THE GROUND-FAULT CURRENT EXCEEDS THIS LEVEL THE ACS­PCM2-5 TURNS OFF THE CIRCUIT RELAY.

Range: 10–200 mA

Default: 30 mA

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.29 Setup|Voltage window (Pipe Freeze Ambient Control)

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INPUT THE CIRCUIT VOLTAGE

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485

measures line voltage, this field does not appear.

Default: 208 V

Assigning Power Cycle Test

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the
circuit is enabled.

Fig. 3.30 Setup|Maint. window (Pipe Freeze Ambient Control)

Input the start time and frequency for the Power Cycle test:

Power Cycle Start Time: THE TIME OF DAY TO START THE POWER CYCLE TEST

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

Power Cycle Test Interval: THE FREQUENCY TO RUN THE POWER CYCLE TEST

Range: Never, Daily, Weekly and Monthly

Default: Never

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

3.5.2. TEMP CONTROL – LINE CONTROL

Fig. 3.31 Pipe Freeze Temperature Line Control window

The Temp Control window allows you to select the temperature control mode to Ambient Control,
Line Control or PASC. This option depends on where the controlling RTD inputs are situated and
utilized: either measuring the temperature of the environment surrounding the pipe (ambient), or
directly on the pipe itself (line). Tap: Line

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.32 Setup|Pipe Freeze Line Control window

Setpoint Temperature:

The setpoint temperature is the desired maintain temperature for the

water pipe.

Based on the measured control temperature, the ACS-PCM2-5 will switch the relay output to
maintain the system at the desired setpoint.

Range: 35°F (2°C)–50ºF (10°C)

Default: 40ºF (4°C)

Deadband: If the control temperature is above the setpoint temperature plus deadband, the relay
output is turned off. If the control temperature is below the setpoint temperature, the output is
turned on.

Range: 1°F (1°C)–10°F (6°C)

Default: 5ºF (3°C)

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Fail Safe: The Fail Safe control button turns the power on or off to the heating cable if the circuit
loses all valid RTDs. When the last remaining sensor for control fails (or communication with the
sensor is lost), the ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-30 controller signals the alarm has been
cleared, returns the circuit to its normal control mode, and records both of these events.

Range: Power On or Power Off

Default: Power On

External Override: The dry contacts from a BMS system or external device may be assigned to the
circuit to de-energize the circuit to save power when it is not needed. All temperature and system
alarms are still active.

ASSIGNING RTDS

After the control mode and parameters have been set tap Setup|RTDs window to assign RTDs to
the circuit. When in line control mode you have the option of setting up to four RTDs for pipe line
sensing. For detailed information on the Setup|RTD window refer to 2.2.3 Assigning and Sharing
RTD Control and Monitoring on page 30. Input from an external dry contact may also be assigned to
override the system. Refer to Appendix Section 5.3, page 130 for further details.

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Fig. 3.33 Setup|RTDs window (Pipe Freeze Line Control)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

ASSIGNING TEMPERATURE ALARMS

Once RTDs have been assigned to the circuit high and low temperature alarms may be set.

Fig. 3.34 Setup|Alarms window (Pipe Freeze Line Control)

High Line Temp Alarm:

If any RTDs assigned to a circuit measures a temperature above this

threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

Range: 100°F (38°C)–190°F (88ºC)

Default: 190°F (88ºC)

Low Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature below this
threshold, the ACS-UIT2 generates an alarm.

Range: 33ºF (1ºC) to maintain setpoint

Default: 33°F (1°C)

Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that
the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm and the relay output is turned off. If the high line
temperature drops below this threshold minus the deadband, the output is turned on and normal
duty cycle control is resumed.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Range: 110°F (43°C)–200ºF (93ºC)

Default: 200°F (93ºC)

High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out capability.

When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds the cut-out
value for the alarm filter time period. If the high line temp cut-out is disabled, the relay output will
continue to function normally without the high temperature cut-out feature.

Options: Enable or Disable

Default: Enable

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Assigning Ground-Fault Alarm and Trip Levels

The Setup|G.F. window allows you to set the alarm and trip levels.

Fig. 3.35 Setup|G.F. window (Pipe Freeze Line Control)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

Ground-Fault Trip: When the ground-fault current exceeds this level the ACS-PCM2-5 turns off the
circuit relay.

Range: 10–200 mA

Default: 30 mA

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

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Fig. 3.36 Setup|Voltage (Pipe Freeze Line Control)

INPUT THE CIRCUIT VOLTAGE

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485

measures line voltage, this field does not appear.

Default: 208 V

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

ASSIGNING POWER CYCLE TEST

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the

circuit is enabled.

Fig. 3.37 Setup|Maint. (Pipe Freeze Line Control)

Input the start time and frequency for the Power Cycle test:

Power Cycle Start Time: THE TIME OF DAY TO START THE POWER CYCLE TEST

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

Power Cycle Test Interval: THE FREQUENCY TO RUN THE POWER CYCLE TEST

Range: Never, Daily, Weekly and Monthly

Default: Never

3.5.3. TEMP CONTROL – PASC CONTROL

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.38 Pipe Freeze Temperature PASC Control window

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The Temp Control window allows you to select the temperature control mode to Ambient Control,
Line Control or PASC. This option depends on where the controlling RTD inputs are situated and
utilized: either measuring the temperature of the environment surrounding the pipe (ambient), or
directly on the pipe itself (line). Tap PASC

Fig. 3.39 Setup|Pipe Freeze PASC Control window

PASC (Proportional Ambient Sensing Control): PASC takes advantage of the fact that the heat loss
from a pipe is proportional to the temperature difference between the pipe and the ambient air. This
is true regardless of heater type, insulation type, or pipe size. Once the heat tracing and insulation on
a pipe has been designed to balance heat input with heat loss for maintaining a 40°F (4°C) pipe, the
main variable in controlling the pipe temperature becomes the ambient air temperature.

The ACS-30 system has a control algorithm that uses the measured ambient temperature, the
desired 40°F maintain temperature, minimum ambient temperature assumption used during design,
and size of the smallest pipe diameter to calculate how long the heater should be on or off to
maintain a near-constant pipe temperature.

Maintain Temperature Setpoint: Fixed design setpoint: 40°F (4°C)

Minimum Ambient: ENTER THE MINIMUM AMBIENT TEMPERATURE FOR YOUR INSTALLATION:

Range: -40°F (-40°C)–40°F (4°C)

Default: 30°F (-1°C)

Min Pipe Size: Min. Pipe Size is the diameter of the smallest heat-traced pipe in the group controlled
by this circuit. Small diameter pipes heat up and cool down more rapidly than larger diameter pipe.
Therefore, the PASC duty cycle is calculated over a shorter time base. Larger diameter pipes heat and
cool less rapidly, so the on/off periods for the heater system can be stretched over a longer period. If
electromechanical contactors are being used to control the heater circuit, the longer time base reduces
the number of contactor on/off cycles and extends the contactor life.

Select: 0.5, 1, ≥ 2 inches

Default: 0.5 inches

Power Adjust: THIS ALLOWS THE PASC CONTROL TO BE ADJUSTED WHEN THE HEATING CABLE
OUTPUT IS GREATER THAN THE DESIGN ASSUMPTION, OR IF THE PIPE INSULATION PROVES TO
BE MORE EFFICIENT THAN ASSUMED. PIPE TEMPERATURE MAY RUN HIGHER OR LOWER THAN
DESIRED IF THE HEATING CABLE HAS A DIFFERENT OUTPUT THAN REQUIRED TO OFFSET THE
HEAT LOSS. THE POWER ADJUST PARAMETER ENABLES A REDUCTION OR AN INCREASE IN
THE HEATING EFFECTIVE POWER BY ENTERING A VALUE LESS OR GREATER THAN 100%

Range: 10–200%

Default: 100%

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

IMPORTANT: If improperly used, the Power Adjust parameter can cause the piping to get too

cold or too hot. If unsure, leave at 100%. Do not change this value unless an engineer calculates
the temperature impact on the system and determines that it is safe to do so. Be particularly
cautious if the circuit has more than one diameter of pipe or type of heat tracing. Contact a nVent
representative for assistance with this factor.

Fail Safe: THE FAIL SAFE CONTROL BUTTON TURNS THE POWER ON OR OFF TO THE
HEATING CABLE IF THE CIRCUIT LOSES ALL VALID RTDS.

When the last remaining sensor for control fails (or communication with the sensor is lost), the
ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-30 controller signals the alarm has been
cleared, returns the circuit to its normal control mode, and records both of these events.

Range: Power On or Power Off

Default: Power On

External Override: THE DRY CONTACTS FROM A BMS SYSTEM OR EXTERNAL DEVICE MAY
BE ASSIGNED TO THE CIRCUIT TO DE-ENERGIZE THE CIRCUIT TO SAVE POWER WHEN IT IS
NOT NEEDED. ALL TEMPERATURE AND SYSTEM ALARMS ARE STILL ACTIVE.

ASSIGNING RTDS

After the control mode and parameters have been set tap Setup|RTDs window to assign RTDs to
the circuit. When in PASC control mode you have the option of setting up to four RTDs for ambient
sensing PASC control. In this mode you can have up to three of the four RTDs set to monitor the
pipe. For detailed information on the RTD window refer to 2.2.3 Assigning and Sharing RTD Control
and Monitoring on page 30. Input from an external dry contact may also be assigned to override the
system. Refer to Appendix Section 5.3, page 130 for further details.

Fig. 3.40 Setup|RTDs window (Pipe Freeze PASC Control)

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Assigning Temperature Alarms

Once RTDs have been assigned to the circuit high and low temperature alarms may be set.

Fig. 3.41 Setup|Alarms window (Pipe Freeze PASC Control)

Note:

Temperature alarms can only be associated to line monitoring RTDs.

High Line Temp Ala

rm: If any RTDs assigned to a circuit measures a temperature above this

threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

Range: 100°F (38°C) to 190°F (88ºC)

Default: 190°F (88ºC)

Low Line Temp

Alarm: If any RTDs assigned to a circuit measures a temperature below this

threshold, the ACS-UIT2 generates an alarm.

Range: 33ºF (1ºC) to maintain setpoint

Default: 33ºF (1ºC)

Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that

the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes

Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.

Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out: IF ANY RTDS ASSIGNED TO A CIRCUIT MEASURES A TEMPERATURE
ABOVE THIS THRESHOLD, THE ACS-UIT2 GENERATES AN ALARM AND THE RELAY OUTPUT IS
TURNED OFF. IF THE HIGH LINE TEMPERATURE DROPS BELOW THIS THRESHOLD MINUS THE
DEADBAND, THE OUTPUT IS TURNED ON AND NORMAL DUTY CYCLE CONTROL IS RESUMED.

Range: 110°F (43°C)–200ºF (93ºC)

Default: 200°F (93ºC)

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High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out

capability. When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds
the cut-out value for the alarm filter time period. If the high line temp cut-out is disabled, the relay
output will continue to function normally without the high temperature cut-out feature.

Options: Enable or Disable

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Default: Enable

Assigning Ground-Fault Alarm and Trip Levels

The Setup|G.F. window allows you to set the alarm and trip levels.

Fig. 3.42 Setup|G.F. window (Pipe Freeze PASC Control)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm: WHEN THE GROUND-FAULT CURRENT EXCEEDS THIS LEVEL THE
ACS-UIT2 GOES IN ALARM.

Range: 10–200 mA

Default: 20 mA

Ground-Fault Trip:

WHEN THE GROUND-FAULT CURRENT EXCEEDS THIS LEVEL THE

ACS-PCM2-5 TURNS OFF THE CIRCUIT RELAY.

Range: 10–200 mA

Default: 30 mA

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.43 Setup|Voltage (Pipe Freeze PASC Control)

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Input the Circuit Voltage

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485

measures voltage this tab does not appear.

Default: 208 V

Assigning Power Cycle Test

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the

circuit is enabled.

Fig. 3.44 Setup|Maint. window (Pipe Freeze PASC Control)

Input the start time and frequency for the Power Cycle test:

Power Cycle Start Time: THE TIME OF DAY TO START THE POWER CYCLE TEST

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

ddress and relay number.

Power Cycle Test Interval: THE FREQUENCY TO RUN THE POWER CYCLE TEST

Range: Never, Daily, Weekly and Monthly

Default: Never

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

3.6. FUEL OIL MODE

The Fuel Oil control mode prompts you to enter the control parameters for a Fuel Oil Flow
Maintenance application. In this mode, you will be given three different control method options:
Ambient, Line, or PASC.

3.6.1. TEMP CONTROL – AMBIENT CONTROL

Fig. 3.45 Fuel Oil Temperature Ambient Control window

The Temp Control window allows you to select the temperature control mode to Ambient Control,
Line Control or PASC. This option depends on where the controlling RTD inputs are situated and
utilized: either measuring the temperature of the environment surrounding the pipe (ambient), or
directly on the pipe itself (line). Tap Ambient.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.46 Setup|Fuel Oil Ambient Control window

Maintain Temperature: THE SETPOINT TEMPERATURE IS THE DESIRED MAINTAIN
TEMPERATURE FOR THE PIPE.

Based on the measured control temperature, the ACS-PCM2-5, or C910-485, will switch the relay
output to maintain the system at the desired setpoint.

Range: 35°F (2°C)–50°F (10°C)

Default: 40ºF (4°C)

If the control temperature is above the setpoint temperature plus deadband, the relay output is
turned off. If the control temperature is below the setpoint temperature, the output is turned on.

Range: 1ºF (1°C)–10ºF (6ºC)

Default: 5ºF (3ºC)

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Fail Safe: THE FAIL SAFE CONTROL BUTTON TURNS THE POWER ON OR OFF TO THE
HEATING CABLE IF THE CIRCUIT LOSES ALL VALID RTDS.

When the last remaining sensor for control fails (or communication with the sensor is lost), the
ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-30 controller signals the alarm has been
cleared, returns the circuit to its normal control mode, and records both of these events.

Range: Power On or Power Off
Default: Power On

External Override: The dry contacts from a BMS system or external device may be assigned to the
circuit to de-energize the circuit to save power when it is not needed. All temperature and system
alarms are still active. Refer to Appendix 5.3 for further details.

Assigning RTDs

After the control mode and parameters have been set tap Setup|RTDs window to assign RTDs to
the circuit. When in line control mode you have the option of setting up to four RTDs for ambient
control. In this mode you can have up to three of the four RTDs set to monitor the pipe. For detailed
information on the RTD window refer to 2.2.3 Assigning and Sharing RTD Control and Monitoring on
page 30. Input from an external dry contact may also be assigned to override the system. Refer to
Appendix Section 5.3, page 130 for further details.

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Fig. 3.47 Setup|RTDs window (Fuel Oil Ambient Control)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Assigning Temperature Alarms

Once RTDs have been assigned to the circuit high and low temperature alarms may be set.

Note: Temperature alarms can only be associated to line monitoring RTDs.
Tap the Alarms button (only shown when line monitoring RTDs are assigned.)

Fig. 3.48 Setup|Alarms window (Fuel Oil Ambient Control)

High Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

Range: 100°F (38°C)–190°F (88ºC)

Default: 190°F (88°C)

Low Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature below this
threshold, the ACS-UIT2 generates an alarm.

Range: 33ºF (1ºC) to maintain setpoint

Default: 33°F (1°C)

Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that
the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm and the relay output is turned off. If the high line
temperature drops below this threshold minus the deadband, the

output is turned on and normal duty cycle control is resumed.

Range: 110°F (43°C)–200ºF (93ºC)

Default: 200°F (93ºC)

High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out capability.
When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds the cut-out
value for the alarm filter time period. If the high line temp cut-out is disabled, the relay output will
continue to function normally without the high temperature cut-out feature.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Options: Enable or Disable

Default: Enable

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Assigning Ground-Fault Alarm and Trip Levels

The Setup|G.F. window allows you to set the alarm and trip levels.

Tap the G.F. button to access the Setup|G.F. window.

Fig. 3.49 Setup|G.F. window (Fuel Oil Ambient Control)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA
Default: 20 mA

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-PCM2-5 turns off
the circuit relay.

Range: 10–200 mA
Default: 30 mA

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

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Fig. 3.50 Setup|Voltage (Fuel Oil Ambient Control)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Input the Circuit Voltage

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485

measure voltage this tab will not appear.

Default: 208 V

Assigning Power Cycle Test

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the

circuit is enabled.

Fig. 3.51 Setup|Maint. window (Fuel Oil Ambient Control)

Input the start time and frequency for the Power Cycle test:

Power Cycle Start Time: The time of day to start the Power Cycle test

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

Power Cycle Test Interval: The frequency to run the Power Cycle Test

Range: Never, Daily, Weekly and Monthly

Default: Never

3.6.2. TEMP CONTROL – LINE CONTROL

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Fig. 3.52 Fuel Oil Temperature Line Control window

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The Temp Control window allows you to select the temperature control mode to Ambient Control,
Line Control or PASC. This option depends on where the controlling RTD inputs are situated and
utilized: either measuring the temperature of the environment surrounding the pipe (ambient), or
directly on the pipe itself (line). Tap: Line.

Fig. 3.53 Setup|Fuel Oil Line Control window

Setpoint Temperature: The setpoint temperature is the desired maintain temperature for the fuel oil
pipe. Based on the measured control temperature, the ACS-PCM2-5 will switch the relay output to
maintain the system at the desired setpoint.

Range: 35°F (2°C)–50ºF (10°C)

Default: 40ºF (4°C)

Deadband: If the control temperature is above the setpoint temperature plus deadband, the relay
output is turned off. If the control temperature is below the setpoint temperature, the output is
turned on.

Range: 1°F (1°C)–10°F (6°C)

Default: 5ºF (3°C)

Fail Safe: The Fail Safe control button turns the power on or off to the heating cable if the circuit
loses all valid RTDs.

When the last remaining sensor for control fails (or communication with the sensor is lost), the
ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-30 controller signals the alarm has been
cleared, returns the circuit to its normal control mode, and records both of these events.

Range: Power On or Power Off

Default: Power On

External Override: The dry contacts from a BMS system or external device may be assigned to the
circuit to de-energize the circuit to save power when it is not needed. All temperature and system
alarms are still active. Refer to Appendix 5.3 for further details.

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Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

ASSIGNING RTDS

After the control mode and parameters have been set tap Setup|RTDs window to assign RTDs to
the circuit. When in line control mode you have the option of setting up to four RTDs for pipe line
sensing. For detailed information on the RTD window refer to 2.2.3 Assigning and Sharing RTD
Control and Monitoring on page 30. Input from an external dry contact may also be assigned to
override the system. Refer to Appendix Section 5.3, page 130 for further details.

Fig. 3.54 Setup|RTDs window (Fuel Oil Line Control)

Assigning Temperature Alarms

Once RTDs have been assigned to the circuit high and low temperature alarms may be set.

Tap the Alarms button

Fig. 3.55 Setup|Alarms window (Fuel Oil Line Control)

High Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Range: 100°F (38°C)–190°F (88ºC)

Default: 190°F (88ºC)

Low Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature below this
threshold, the ACS-UIT2 generates an alarm.

Range: 33ºF (1ºC) to maintain setpoint

Default: 33°F (1°C)

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Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that
the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm and the relay output is turned off. If the high line
temperature drops below this threshold minus the deadband, the output is turned on and normal
duty cycle control is resumed.

Range: 110°F (43°C)–200ºF (93ºC)

Default: 200°F (93ºC)

High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out capability.
When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds the cut-out
value for the alarm filter time period. If the high line temp cut-out is disabled, the relay output will
continue to function normally without the high temperature cut-out feature.

Options: Enable or Disable

Default: Enable

Assigning Ground-Fault Alarm and Trip Level

The Ground-fault window allows you to set the alarm and trip levels.

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Fig. 3.56 Setup|G.F. window (Fuel Oil Line Control)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm:

When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

Ground-Fault Trip: When the ground-fault current exceeds this level the ACS-PCM2-5, or C910-485,
turns off the circuit relay.

Range: 10–200 mA

Default: 30 mA

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

Fig. 3.57 Setup|Voltage window (Fuel Oil Line Control)

Input the Circuit Voltage

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels), Since the C910-485

measures voltage this tab will not appear.

Default: 208 V

Assigning Power Cycle Test

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the
circuit is enabled.

Fig. 3.58 Setup|Maint. window (Fuel Oil Line Control)

Input the start time and frequency for the Power Cycle test:

Power Cycle Start Time: The time of day to start the Power Cycle test

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

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Power Cycle Test Interval: The frequency to run the Power Cycle Test

Range: Never, Daily, Weekly and Monthly

Default: Never

3.6.3. TEMP CONTROL – PASC CONTROL

Fig. 3.59 Fuel Oil Temperature PASC Control window

The Temp Control window allows you to select the temperature control mode to Ambient Control,
Line Control or PASC. This option depends on where the controlling RTD inputs are situated and
utilized: either measuring the temperature of the environment surrounding the pipe (ambient), or
directly on the pipe itself (line). Tap PASC

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Fig. 3.60 Setup|Fuel Oil PASC Control window

PASC (Proportional Ambient Sensing Control): PASC takes advantage of the fact that the heat
loss from a pipe is proportional to the temperature difference between the pipe and the ambient
air. This is true regardless of heater type, insulation type, or pipe size. Once the heat tracing and
insulation on a pipe has been designed to balance heat input with heat loss for maintaining a 40°F
pipe, the main variable in controlling the pipe temperature becomes the ambient air temperature.
The ACS-30 system has a control algorithm that uses the measured ambient temperature, the
desired 40°F maintain temperature, minimum ambient temperature assumption used during design,
and size of the smallest pipe diameter to calculate how long the heater should be on or off to
maintain a near-constant pipe temperature.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Min Pipe Size: Min. Pipe Size is the diameter of the smallest heat-traced pipe in the group controlled
by this circuit. Small diameter pipes heat up and cool down more rapidly than larger diameter pipe.
Therefore, the PASC duty cycle is calculated over a shorter time base. Larger diameter pipes heat and
cool less rapidly, so the on/off periods for the heater system can be stretched over a longer period.
If electromechanical contactors are being used to control the heater circuit, the longer time base
reduces the number of contactor on/off cycles and extends the contactor life.

Select: 0.5, 1, ≥ 2 inches

Default: 0.5 inches

Maintain temperature setpoint:

Fixed design setpoint: 40°F (5°C)

Minimum Ambient: Enter the minimum ambient temperature for your installation:

Range: -40°F (-40°C)–40°F (5°C)

Default: 30°F (-1°C)

Power Adjust: This allows the PASC control to be adjusted when the heating cable output is greater
than the design assumption, or if the pipe insulation proves to be more efficient than assumed. Pipe
temperature may run higher or lower than desired if the heating cable has a different output than
required to offset the heat loss. The Power Adjust parameter enables a reduction or an increase in
the heating effective power by entering a value less or greater than 100%

Range: 10–200%

Default: 100%
IMPORTANT: If improperly used, the Power Adjust parameter can cause the piping to get too
cold or too hot. If unsure, leave at 100%. Do not change this value unless an engineer calculates
the temperature impact on the system and determines that it is safe to do so. Be particularly
cautious if the circuit has more than one diameter of pipe or type of heat tracing. Contact a nVent
representative for assistance with this factor.

Fail Safe: The Fail Safe control button turns the power on or off to the heating cable if the circuit
loses all valid RTDs.

When the last remaining sensor for control fails (or communication with the sensor is lost), the
ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-30 controller signals the alarm has been
cleared, returns the circuit to its normal control mode, and records both of these events.

Range: Power On or Power Off

Default: Power On

External Override: The dry contacts from a BMS system or external device may be assigned to the
circuit to de-energize the circuit to save power when it is not needed. All temperature and system
alarms are still active. Refer to Appendix 5.3 for further details.

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

nVent.com | 89

Assigning RTDs

After the control mode and parameters have been set tap Setup|RTDs window to assign RTDs to
the circuit. When in PASC control mode you have the option of setting up to four RTDs for ambient
sensing PASC control. In this mode you can have up to three of the four RTDs set to monitor the
pipe. For detailed information on the RTD window refer to 2.2.3 Assigning and Sharing RTD Control
and Monitoring on page 30. Input from an external dry contact may also be assigned to override the
system. Refer to Appendix Section 5.3, page 130 for further details.

Fig. 3.61 Setup|RTDs window (Fuel Oil PASC Control)

Temperature Alarms

Once RTDs have been assigned to the circuit high and low temperature alarms may be set.

Note: Temperature alarms can only be associated to line monitoring RTDs.

Tap the Alarms button (only shown when line monitoring RTDs are assigned.)

Fig. 3.62 Setup|Alarms window (Fuel Oil PASC Control)

High Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

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Range: 100°F (38°C)–190°F (88ºC)
Default: 190°F (88°C)

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Low Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature below this
threshold, the ACS-UIT2 generates an alarm.

Range: 33ºF (1ºC) to maintain setpoint

Default: 33°F (1°C)

Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that
the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes

Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.

Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm and the relay output is turned off. If the high line
temperature drops below this threshold minus the deadband, the output is turned on and normal
duty cycle control is resumed.

Range: 110°F (43°C)–200ºF (93ºC)

Default: 200°F (93ºC)

High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out capability.
When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds the cut-out
value for the alarm filter time period. If the high line temp cut-out is disabled, the relay output will
continue to function normally without the high temperature cut-out feature.

Options: Enable or Disable

Default: Enable

Assigning Ground-Fault Alarm and Trip Levels

The Ground-fault window allows you to set the alarm and trip levels. Tap the G.F. button to access
the ground-fault window.

Fig. 3.63 Setup|G.F. window (Fuel Oil PASC Control)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

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Ground-Fault Trip: When the ground-fault current exceeds this level the ACS-PCM2-5, or C910-485,
turns off the circuit relay.

Range: 10–200 mA
Default: 30 mA

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

Fig. 3.64 Setup|Voltage window (Fuel Oil PASC Control)

Input the Circuit Voltage

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485
measures voltage this tab will not appear.
Default: 208 V

Assigning Power Cycle Test

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the
circuit is enabled.

nVent.com | 92

Fig. 3.65 Setup|Maint. window (Fuel Oil PASC Control)

Input the start time and frequency for the Power Cycle test:

Raychem-AR-H58692-ACS30UIT2Programming-EN-1805

Power Cycle Start Time: The time of day to start the Power Cycle test

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

Power Cycle Test Interval:

The frequency to run the Power Cycle Test

Range: Never, Daily, Weekly and Monthly

Default: Never

3.7. GREASY WASTE AND TEMPERATURE MAINTENANCE MODE

The Greasy Waste control mode prompts you to enter the control parameters for a Greasy Waste
application and other applications with a maintain temperature greater than 70°F.

Note: Greasy waste mode is also used for XL-Trace applications where line control above 40°F is
required.

Fig. 3.66 Setup|Greasy Waste/TM window

Temperature Setpoint: The pipe temperature setpoint is the desired maintain temperature. Based
on the measured control temperature, the ACS-UIT2 will switch the relay output to maintain the
system at the desired setpoint.

Range: 70°F (21°C)–140°F (60°C)

Default: 110ºF (43°C)

Economy Temperature (optional): This value represents the temperature that you want the pipe
to maintain when in economy mode. This input is only accessible if the Setpoint Mode is set to
Variable which applies the temperature setpoint 24/7 scheduler function described in Appendix 5.2
24/7 Scheduler on page 127.

Enter the Economy Temperature

Range: 70°F (21°C) to Maintain temperature

Default: 90°F (32°C)

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Deadband: If the control temperature is above the setpoint temperature plus deadband, the relay
output is turned off. If the control temperature is below the setpoint temperature, the output is
turned on.

Range: 1°F (1°C)–10°F (6°C)

Default: 5ºF (3°C)

Fail Safe: The Fail Safe control button turns the power on or off to the heating cable if the circuit
loses all valid RTDs. When the last remaining sensor for control fails (or communication with the
sensor is lost), the ACS-UIT2:

• Signals an alarm for the failure of the sensor

• Changes control of the circuit to the fail safe control selected

• Changes the control status display to indicate that control of the circuit is in the fail safe state

• Records the events

When the sensor for control is returned to service, the ACS-30 controller signals the alarm has been
cleared, returns the circuit to its normal control mode, and records both of these events.

Options: Power On or Power Off

Default: Power On

Schedule: Tapping on this button will bring up the Scheduler. See Appendix 5.2 24/7 Scheduler on
page 127 for more information.

ASSIGNING RTDS

Tap Setup|RTDs window to assign RTDs after the control mode and parameters have been set.

In this mode you have the option of setting up to four RTDs for pipe temperature sensing. For
detailed information on the RTD window refer to 2.2.3 Assigning and Sharing RTD Control and
Monitoring on page 30.

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Fig. 3.67 Setup|RTDs window (Grease/TM Waste)

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Assigning Temperature Alarms

Once RTDs have been assigned to the circuit the alarm button appears then high and low
temperature alarms may be set. Tap the Alarms button

Fig. 3.68 Setup|Alarm window (Grease/TM Waste)

High Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm. The limit can be set for any temperature value you
desire for your application within the range allowed.

Range: Maintain temperature plus 10°F (-6°C) to 150°F (88ºC)

Default: 130°F (88°C)

Low Line Temp Alarm: If any RTDs assigned to a circuit measures a temperature below this
threshold, the ACS-UIT2 generates an alarm.

Range: 40ºF (4ºC) to maintain temperature

Default: 40°F (4°C)

Temperature Alarm Filter: This minimizes nuisance alarms by forcing the ACS-UIT2 to verify that
the alarm condition continually exists over the selected period of time before alarming.

Range: 0–999 minutes

Default: 15 minutes
Note: Setting the Alarm Filter to 0 minutes is mainly for testing and demonstration purposes.
Choosing this option for normal use may cause nuisance alarming since this option may not allow
the ACS-UIT2 time to verify that the alarm conditions exist.

High Line Temp Cut-Out: If any RTDs assigned to a circuit measures a temperature above this
threshold, the ACS-UIT2 generates an alarm and the relay output is turned off. If the high line
temperature drops below this threshold minus the deadband, the output is turned on and normal
duty cycle control is resumed.

Range: Maintain setpoint plus 20°F (11°C) to 160ºF (93 ºC)

Default: 140°F (93ºC)

High Line Temp Cut-Out Enable/Disable: Enables or disables the high line temp cut-out capability.
When enabled, the ACS-UIT2 alarms and the output relay turns OFF if any RTDs exceeds the cut-out
value for the alarm filter time period. If the high line temp cut-out is disabled, the relay output will
continue to function normally without the high temperature cut-out feature.

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Options: Enable or Disable

Default: Enable

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ASSIGNING GROUND-FAULT ALARM AND TRIP LEVELS

The Ground-fault window allows you to set the alarm and trip levels. Tap the G.F. button to access
the ground-fault window.

Fig. 3.69 Setup|G.F. window (Grease/TM Waste)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

Ground-Fault Trip: When the ground-fault current exceeds this level the ACS-PCM2-5, or C910-485,
turns off the circuit relay.

Range: 10–200 mA

Default: 30 mA

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

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Fig. 3.70 Setup|Voltage window (Grease/TM)

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Input the Circuit Voltage

Voltage: 120, 208, 240 or 277 V (Standard ACS-PCM2-5 panels) Since the C910-485

measures voltage this tab will not appear.

Default: 208 V

Assigning Power Cycle Test

The Setup|Maint. window allows you to enable the Power Cycle test start time and frequency. After
the start time and frequency are entered the time of the next test will be displayed on this screen.

Note: If the circuit is disabled, forced on, or forced off, the power cycle test will be disabled until the
circuit is enabled.

Fig. 3.71 Setup|Maint. window (Grease/TM)

Input the start time and frequency for the Power Cycle test:

Power Cycle Start Time: The time of day to start the Power Cycle test

Range: 00:00 to 23:59

Default: Each circuit is assigned a unique default start time calculated from the device

address and relay number.

Power Cycle Test Interval: The frequency to run the Power Cycle test

Range: Never, Daily, Weekly and Monthly

Default: Never

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3.8. ROOF AND GUTTER DE-ICING MODE

The Roof & Gutter De-icing control mode prompts you to enter the control parameters for a Roof
and Gutter De-icing application. In this mode, you will be given three different control method
options: External Device, Ambient Temp and Surface Temp.

3.8.1. TEMP CONTROL – EXTERNAL DEVICE CONTROL

Fig. 3.72 Roof & Gutter External Device Control window

The External Device window allows you to control your Roof & Gutter De-icing application using the
dry contacts on a snow controller. Refer to Appendix 5.3 Connecting External Control Devices on
page 130 for connection details. Tap External Device.

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Fig. 3.73 Setup|Roof and Gutter External Device Control window

Control: In the external device mode the dry contacts from a snow controller are connected to a
RTD input, or C910-485 external device, terminal. If the contacts are closed the circuit is turned on. If
the contacts are open the circuit is turned off.

Deadband: If a RTD is used on the system and the measured temperature is above the high
temperature override setpoint temperature plus deadband, the relay output is turned off. If the
control temperature is below the setpoint temperature, the output is turned on.

Range: 1°F (1°C)–9°F (5°C)

Default: 5ºF (3C)

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High Temperature Override: The high temperature override is the setpoint that will override the
external device input.

Range: 40°F (4°C)–90°F (32°C)

Default: 55ºF (13°C)

Override Manual: This feature provides a manual override to force the circuit on or off for a
specified period of time for the circuit.

Range: 0–10 hours

Default: 0 hours

Hrs: On or off

Power Off Delay: Continue to power the circuit when the external control devices contacts open.

Range: 0–10 hours

Default: 0 hours

ASSIGNING RTDS

After the control mode and parameters are set, tap Setup|RTDs window to assign RTDs to the
circuit.

When in external device control mode you have the option of setting up to four inputs through
any RTD inputs in your system. You must have a least one External Control device, and for High
Temperature Override at least one RTD must be assigned. For detailed information on the RTD
window refer to Section 2.2.3 Assigning and Sharing RTD Control and Monitoring on page 30.

Note: If a RTD is connected to the ACS-PCM2-5, or C910-485, relay the heating cable is assigned in
this mode it must be assigned to high temperature override.

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Fig. 3.74 Setup|RTDs window (Roof & Gutter External Control)

In this example a RTD was connected to the ACS-PCM2-5 relay and the External Control input was
assigned from a different input.

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Assigning Ground-Fault Alarm and Trip Levels

The Setup|G.F. window allows you to set the alarm and trip levels. Tap the G.F. button to access the
Setup|G.F. window.

Fig. 3.75 Setup|G.F. Window (Roof & Gutter External Device)

Input the Ground-Fault Alarm and Ground-Fault Trip:

Ground-Fault Alarm: When the ground-fault current exceeds this level the ACS-UIT2 goes in alarm.

Range: 10–200 mA

Default: 20 mA

Ground-Fault Trip: When the ground-fault current exceeds this level the ACS-PCM2-5, or C910-485,
turns off the circuit relay.

Range: 10–200 mA

Default: 30 mA

Assigning Circuit Voltage

The Setup|Voltage window allows you to set the circuit voltage used to calculate the energy
consumption of the circuit.

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Fig. 3.76 Setup|Voltage Window (Roof & Gutter External Device)

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