iWorX ALM2 User guide

© 2010 Taco Electronic Solutions, Inc. 1
Application Guide 505-013
ALM2 Alarm Module
Self-Contained Interoperable Controller Model UCP-1
SUPERSEDES: September 23, 2010 EFFECTIVE: November 12, 2010
Table of Contents
ALM2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Purpose of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . 3
Representations and Warranties . . . . . . . . . . . . . . . . . 3
Applicable Documentation . . . . . . . . . . . . . . . . . . . . . . 4
Installation Instructions. . . . . . . . . . . . . . . . . . . . . . . . . 4
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Before Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
About this Document . . . . . . . . . . . . . . . . . . . . . . . . 5
Inspecting the Equipment . . . . . . . . . . . . . . . . . . . . 5
What is Not Included with this Equipment . . . . . . . . 5
Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . 5
Selecting a Power Source . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting the Device . . . . . . . . . . . . . . . . . . . . . . . . 6
Routing Cabling to the Device . . . . . . . . . . . . . . . . . 7
Grounding the Device . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Input Devices. . . . . . . . . . . . . . . . . . . .10
Connecting Output Devices . . . . . . . . . . . . . . . . . .11
Other Connections . . . . . . . . . . . . . . . . . . . . . . . . .11
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Application Description . . . . . . . . . . . . . . . . . . . . . . . . 13
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . 13
Temperature Alarms. . . . . . . . . . . . . . . . . . . . . . . .13
Switch Status Alarms . . . . . . . . . . . . . . . . . . . . . . .14
Alarm Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Automatic Configuration . . . . . . . . . . . . . . . . . . . . .14
Controller Identification . . . . . . . . . . . . . . . . . . . . . . . . 14
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . .18

iWorX® ALM2
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© 2010 Taco Electronic Solutions, Inc.
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iWorX® ALM2
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© 2010 Taco Electronic Solutions, Inc.
ALM2
The iWorX® ALM2 alarm module is a stand-alone microprocessor based controller for alarm generation. The applica-
tion is for heating, ventilating, and air conditioning (HVAC) equipment.
Overview
The ALM2 provides alarm detection and reporting by monitoring up to eight inputs. Each input can be configured to
support a temperature reading using a thermistor or a dry contact reading.
Each alarm event detected is reported to the network. Digital outputs are provided to drive external alarm indication
such as lamps or buzzers.
The controller is based on the LONWORKS®networking technology. The controller can be networked to a higher-level
control system for monitoring and control applications.
Features
• Temperature based alarms
• Digital based alarms using dry contacts
• Alarm-controlled triac outputs
•LONWORKS interface to building automation systems.
• Automatic configuration with the iWorX® Local Control Interface (LCI)
PURPOSE OF THIS GUIDE
The iWorX ALM2 Application Guide provides application information for the ALM2 Controller.
The reader should understand basic HVAC concepts, intelligent environmental control automation, and basic LON-
WORKS networking and communications. This Application Guide is written for:
• Users who engineer control logic
• Users who set up hardware configuration
• Users who change hardware or control logic
• Technicians and field engineers of Taco Electronic Solutions, Inc.
REPRESENTATIONS AND WARRANTIES
This Document is subject to change from time to time at the sole discretion of Taco Electronic Solutions, Inc. All
updates to the Document are available at www.taco-hvac.com. When installing this product, it is the reader’s responsi-
bility to ensure that the latest version of the Document is being used.
The iWorX® ALM2 shall only be used for the applications identified in the product specifications and for no other pur-
poses. For example, the iWorX® ALM2 is not intended for use to support fire suppression systems, life support sys-
tems, critical care applications, commercial aviation, nuclear facilities or any other applications where product failure
could lead to injury to person, loss of life, or catastrophic property damage and should not be used for such purposes.
Taco Electronic Solutions, Inc. will not be responsible for any product or part not installed or operated in conformity with
the Document and instructions or which has been subject to accident, disaster, neglect, misuse, misapplication, inade-
quate operating environment, repair, attempted repair, modification or alteration, or other abuse. For further informa-
tion, please refer to the last page of this Document for the company’s Limited Warranty Statement, which is also issued
with the product or available at www.taco-hvac.com.

iWorX® ALM2
4 505-013, Effective: November 12, 2010
© 2010 Taco Electronic Solutions, Inc.
APPLICABLE DOCUMENTATION
See the table below for additional documentation that may be applicable to this controller.
INSTALLATION INSTRUCTIONS
PRECAUTIONS
General
This symbol is intended to alert the user to the presence of important installation and maintenance (servic-
ing) instructions in the literature accompanying the equipment.
WARNING: Electrical shock hazard. Disconnect ALL power sources when installing or servicing this
equipment to prevent electrical shock or equipment damage.
Make all wiring connections in accordance with these instructions and in accordance with pertinent national and local
electrical codes. Use copper conductors only.
Static Electricity
Static charges produce voltages that can damage this equipment. Follow these static electricity precautions when
handing this equipment.
• Work in a static free area.
• Touch a known, securely grounded object to discharge any charge you may have accumulated.
• Use a wrist strap when handling printed circuit boards. The strap must be secured to earth ground.
Location
Avoid locations where corrosive fumes, excessive moisture, vibration or explosive vapors are present.
Avoid electrical noise interference. Do not install near large contactors, electrical machinery, or welding equipment.
This equipment is suitable for indoor or outdoor use. Preferably, or as required by National Electrical Code, the unit is
intended to be installed within an electrical control enclosure. Operate where ambient temperatures do not exceed
140 °F (60 °C) or fall below 32 °F (0 °C) and relative humidity does not exceed 90%, non-condensing.
Description Audience Purpose
iWorX® LCI2 Application Guide, Doc-
ument No. 505-002
– Application Engineers
– Installers
– Service Personnel
– Start-up Technicians
– End user
Provides instructions for setting up and using
the iWorX® Local Control Interface.
http://iWorxWizard.taco-hvac.com – Application Engineers
– Wholesalers
– Contractors
An on-line configuration and submittal package
generator based on user input. Automatically
generates bill of materials, sequence of opera-
tions, flow diagrams, wiring diagrams, points
and specifications.
Additional
Documentation
LonWorks FTT-10A Free Topology Transceiver User’s Guide, published by Echelon Corpo-
ration. It provides specifications and user instructions for the FTT-10A Free Topology Trans-
ceiver. See also: www.echelon.com/support/documentation/manuals/transceivers.
.

iWorX® ALM2
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© 2010 Taco Electronic Solutions, Inc.
FCC Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of
the FCC rules. These limits are designed to provide reasonable protection against harmful interference. This equip-
ment can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a par-
ticular installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment to a power source different from that to which the receiver is connected.
• Consult the equipment supplier or an experienced radio/TV technician for help.
You are cautioned that any changes or modifications to this equipment not expressly approved in these instructions
could void your authority to operate this equipment in the United States.
BEFORE INSTALLING
About this Document
The instructions in this manual are for the ALM2 module, which provides auxiliary alarm capabilities to an iWorX® sys-
tem.
Inspecting the Equipment
Inspect the shipping carton for damage. If damaged, notify the carrier immediately. Inspect the equipment for damage.
Return damaged equipment to the supplier.
What is Not Included with this Equipment
• A power source for the equipment electronics and peripheral devices.
• Tools necessary to install, troubleshoot and service the equipment.
• The screws or DIN rail needed to mount the device.
• Peripheral devices, such as sensors, actuators, etc.
• Cabling, cabling raceway, and fittings necessary to connect this equipment to the power source, FTT-10A network
and peripheral devices.
Equipment Location
Abide by all warnings regarding equipment location provided earlier in this document.
Optimally, the equipment should be installed within a secure enclosure.
If the equipment is to be installed outdoors, it must be contained within a protective enclosure. The enclosure must
maintain internal temperature and humidity within the ranges specified for this equipment.
The equipment must be installed within 500 feet of all input peripherals (smoke detectors, sensors, etc.) that will be
connected to the equipment.
Selecting a Power Source
This equipment requires a UL recognized Class 2 external power source (not supplied) to operate. The controller
power input requires a voltage of 24 Volts AC.
To calculate power source current requirements, add the power consumption of all peripheral devices to that of the
controller.

iWorX® ALM2
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© 2010 Taco Electronic Solutions, Inc.
The controller and triac output loads can use the same power source. If both are using the same power source, the
loads must have EMF protection. This protection can be integral to the load, or installed in the 24 VAC wiring across the
load’s coil.
To provide necessary RFI and transient protection, the controller’s ground (GND) pin (T40) must be connected to earth
ground or the earth ground of the packaged unit’s enclosure ground. Failure to properly ground the controller may
cause it to exceed FCC limits. Excessive noise could also produce inaccurate sensor data. The power source must be
capable of operating with this connection to ground.
INSTALLATION
Warning: Electrical shock hazard. To prevent electrical shock or equipment damage, disconnect ALL
power sources to controllers and loads before installing or servicing this equipment or modifying any wir-
ing.
Mounting the Device
1.Select a mounting location. Enclosure mounting is recommended.
2.Hold the controller on the panel you wish to mount it on. With a marker or pencil mark the mounting locations on
the panel.
3.Using a small drill bit pre-drill the mounting holes.
4.Using two #6 pan head screws, mount the controller to the panel.
5.Wire the controller (See Routing Cabling to the Device).

iWorX® ALM2
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© 2010 Taco Electronic Solutions, Inc.
Figure 1: Mounting Dimensions
Routing Cabling to the Device
Cabling used to connect the power source and cabling used to connect the FTT-10A network must remain
separated within the control enclosure and wiring conduit.

iWorX® ALM2
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Grounding the Device
The ground terminal (T40) must be securely connected to earth ground. Failure to properly ground this
equipment will result in improper operation. Improper grounding may also increase the risk of electrical
shock and may increase the possibility of interference with radio/TV reception.
For best performance, connect the power supply common terminal (T38) to the same external point as the
ground terminal (T40).
WIRING INFORMATION
WARNING: Terminals 9, 12, 15, 18 and 38 are connected internally on all ALM2 controllers. Disconnect
ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment
damage.
The Figures below show a typical ALM2 installation with four thermistor inputs and four switch inputs. All outputs are
connected to loads. These are only examples. Not all applications will require one of these wiring configurations.
Figure 2:
Class 2
Typical ALM2 Wired as Power Sourcing

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© 2010 Taco Electronic Solutions, Inc.
Figure 3:
Class 2
Typical ALM2 Wired as Power Sinking

iWorX® ALM2
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© 2010 Taco Electronic Solutions, Inc.
Figure 4:
Class 2
Typical ALM2 Wired as Power Isolated
Connecting Input Devices
All inputs can be used for either analog thermistors or digital contact switches. The software configuration of the con-
troller determines whether a particular input is read as a temperature or digital input.
Temperature Inputs
To connect a temperature sensor to the unit, attach one wire from the thermistor to an input terminal, (T8, T10, T11,
T13, T14, T16, T17, or T19) and the other wire to an adjacent common (T9, T12, T15, or T18). The thermistor used
must be 10K Precon Type III.

iWorX® ALM2
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© 2010 Taco Electronic Solutions, Inc.
Digital Inputs
The contacts for digital inputs may be either normally closed or normally open digital switches. To connect a contact to
the unit, connect one wire from the contact to an input terminal, dry, and the other wire to an adjacent common (T9,
T12, T15, or T18).
Connecting Output Devices
Each output is directly linked to a specific input. The alarm associated with input 1 (if there is to be one) must be con-
nected to the first output, the alarm associated with input 2 must be connected to the second output, etcetera. This is
not configurable.
All eight outputs are triac outputs. The outputs can only switch loads that can be energized by 24 VAC. If an output is
being used to light an indicator, a 24 VAC lamp must be used. If an output is being used to enable a larger load, the
output must be connected to 24 VAC pilot relays.
Other Connections
Network (LON)
Network wiring must be twisted pair. One network wire must be connected to terminal NETA (T1) and the other network
wire must be connected to terminal NETB (T2). Polarity is not an issue since an FTT-10A network is used for commu-
nications.
Power (PWR)
Connect one output wire from a 24 VAC power supply to PWR (T39) and the other output wire from the power supply to
the adjacent common terminal (T38).
Ground (GND)
Terminal GND (T40) must be connected to earth ground. Failure to properly ground this equipment will
result in improper operation. Improper grounding may also increase the risk of electrical shock, and may
increase the possibility of interference with radio and TV reception.
SPECIFICATIONS
Electrical
Inputs
• Cabling: twisted shielded pair, 18 AWG recommended—500 feet max. (152 meters)
• Resolution: 10 bit
Thermistor Inputs
• Precon Type III 10K thermistor
Switch Inputs
• Dry Contact
• Nomally closed or normally open
•5Volts DC Max
Outputs
•24Volts AC
•1Amp @ 50C, 0.5 Amp @ 60C, limited by the Class 2 supply rating
Power
Power Requirements
• 24VAC (20VAC to 28VAC), requires an external Class 2 supply
Power Consumption
• 7.2W with no external loads, maximum limited by the Class 2 supply rating

iWorX® ALM2
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Recommended Sensor Wire
FTT-10A Network
• Speed: 78KBPS
• Cabling: Maximum node-to-node distance: 1312 feet (400 meters)
• Maximum total distance: 1640 feet (500 meters)
For detailed specifications, refer to the FTT-10A Free-Topology Transceiver User’s Guide published by Echelon Corpo-
ration (www.echelon.com/support/documentation/manuals/transceivers).
Mechanical
Housing
• Dimensions: 5.55” (141mm) high, 6.54” (166 mm) wide, 1.75” deep (44 mm)
• ABS
Weight
• Controller Weight: 0.70 pounds (0.32 kilograms)
• Shipping Weight: 1.0 pounds (0.46 kilograms)
Electronics
• Processor: 3150 Neuron 10 MHz
• Flash: 48 Kilobytes
• SRAM: 8 Kilobytes
• Termination: 0.197” (5.0 mm) Pluggable Terminal Blocks, 14-22 AWG
Environmental
• Temperature: 32 °F to 140 °F (0 °C to 60 °C)
• Humidity: 0 to 90%, non-condensing
Agency Listings
• UL Listed for US and Canada, Energy Management Equipment PAZX and PAZX7.
Agency Compliances
• FCC Part 15 Class A
Cable Type Pairs Details Taco Catalog No.
18AWG 1 Stranded Twisted Shielded Pair, Plenum WIR-018
Cable Type Pairs Details Taco Catalog No.
Level 4 22AWG (0.65mm) 1 Unshielded, Plenum, U.L. Type CMP WIR-022

iWorX® ALM2
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APPLICATION DESCRIPTION
The ALM2 provides alarm detection and reporting by monitoring up to eight inputs. Each input can be configured to
support a thermistor reading or a switch contact reading. Each alarm event detected is reported to the network. Digital
outputs are provided to drive external alarm indication such as lamps or buzzers, or to drive larger loads when used
with pilot relays.
Figure 5: ALM2 Application
ALM2
Each of the unit’s eight inputs can be configured to accept either digital or analog information. Digital inputs are pro-
vided from dry contact switches, and either normally open or normally closed switches may be used. Analog inputs are
provided from thermistors.
If an input is configured to read from an analog thermistor, the temperature reading is compared to a high and a low
limit. If the temperature is above the high limit or below the low limit, the controller generates a temperature alarm for
that input.
SEQUENCE OF OPERATION
This section describes the detailed sequence of operation for the controller.
Temperature Alarms
Thermistors are used for temperature inputs. The ALM2 reads the sensor and converts it to temperature once every
execution cycle. The converted value is made available as a network variable output. The temperature reading is com-
pared to two threshold levels: an upper threshold and a lower threshold. If the reading is below the lower threshold or
above the upper threshold then an alarm is generated. Four different detection methods are available by manipulating
the threshold levels.
Disable temperature detection by disabling the input.
The ALM2 also provides adjustable hysteresis on the threshold comparisons to prevent excessive alarm output jitter.
There is one “master” hysteresis adjustment for all thermistor alarm detectors, while the upper and lower thresholds are
adjustable for each input. The threshold and hysteresis adjustments are adjustable via the LCI.
Detection Method Lower Threshold Upper Threshold
Out of Range Low Setpoint High Setpoint
Over Limit High Setpoint Maximum Setting (230.0 °F, 110.0 °C)
Under Limit Minimum Setting (-29.9 °F, -34.4 °C) Low Setpoint

iWorX® ALM2
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Switch Status Alarms
Switch inputs are read and converted to “On” or “Off” readings once every execution cycle. The converted values are
made available as network variable outputs. If the switch reading is “On” then an alarm is generated. The polarity of
each switch is configurable. The default polarity is “Normally Open”, meaning that the switch is “Off” when open, and
“On” when closed. By setting the inverted polarity option, then the switch is read as “On” when its contacts are open,
and “Off” when they are closed.
Alarm Outputs
When any of the temperature or switch alarms are triggered, the corresponding alarm output is enabled. This output
can be used to directly drive a status panel indicator lamp, or to drive a larger load using a pilot relay. Each alarm input
is fixed to drive a specific output. The alarm associated with input 1 drives the first output, the alarm associated with
input 2 drives the second output, and so on.
When an output is enabled, an event message is sent to the Local Control Interface. The name of the input that trig-
gered the alarm can be set so that the error message that is displayed at the LCI describes the error detected (e.g.:
“Freezer #1 Hi Limit” or “Fan #3 Contact Alarm”).
Automatic Configuration
The ALM2 and iWorX® Local Control Interface (LCI) use a self-configuring network management scheme requiring no
external tools, binding, or LONWORKS knowledge. The LCI recognizes and configures the ALM2 when the controller’s
service pin is pressed. The controller’s status light flashes green until the controller is configured, and will be solid
green after the controller is configured. Once the service pin has been pressed, no further action is required by the
user; the controller is fully accessible to the LCI. Users may bind to SNVTs on the ALM2 with LNS or other LONWORKS
tools if they wish.
The LCI also provides network supervision of the ALM2. The LCI periodically sends a "ping" message to the ALM2,
which elicits a response. If the response fails, an alarm is displayed on the LCI. The LCI also uses the "ping" message
to refresh the occupancy mode and other system wide data.
CONTROLLER IDENTIFICATION
Once the ALM2 is properly installed and recognized by the Local Control Interface (LCI), the LCI can be used to config-
ure the settings of the controller. This section describes the commands available on the LCI for configuration of the
ALM2, and the meanings and default values for controller parameters. For more information on using the LCI, see the
LCI2 Application Guide.
Inputs
The Inputs screen displays the current values of the ALM2’s inputs. These values cannot be changed. Since the names
and types of all eight inputs are user-configurable, this table only refers to the types of inputs. Refer to “All Settings” on
page 15 for details on how to view and set the input type and name for each input. The default name for each config-
ured input is Alarm #, where # is the reference number that was configured for the given input.
Input Type Range Description
Thermistor -29.9 to 230.0 °F
(-34.4 to 110.0 °C)
Measured temperature from the
input.
Switch Off, On Current state of the digital input.

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Outputs
This screen displays the current values of the ALM2’s outputs. These values cannot be changed from this screen. The
default name for each configured output is Output #X, where X is the output reference number that was configured for
the given output.
Configuration
All Settings
This screen displays the settings used by the controller.
Output Range Description
Output #1 Off, On Status of each alarm output.
Output #2
Output #3
Output #4
Output #5
Output #6
Output #7
Output #8
Setting Range Default Description
Hysteresis 0.0 to 9.0 °F
(0.0 to 5.0 °C)
0.9 °F (0.5 °C) Amount of hysteresis used during
thermistor data comparisons.
Input #1 Lo Limit -29.9 to 230.0 °F
(-34.4 to 110.0 °C)
32.0 °F
(0.0 °C)
Threshold temperature below
which the controller will report a
temperature alarm.
Input #2 Lo Limit
Input #3 Lo Limit
Input #4 Lo Limit
Input #5 Lo Limit
Input #6 Lo Limit
Input #7 Lo Limit
Input #8 Lo Limit
Input #1 Hi Limit -29.9 to 230.0 °F
(-34.4 to 110.0 °C)
50.0 °F (10.0 °C) Threshold temperature above
which the controller will report a
temperature alarm.
Input #2 Hi Limit
Input #3 Hi Limit
Input #4 Hi Limit
Input #5 Hi Limit
Input #6 Hi Limit
Input #7 Hi Limit
Input #8 Hi Limit
Input #1 Type Disabled,
Thermistor,
Switch (Open),
Switch (Closed)
Disabled Operating mode for each input. For
switch inputs, the word in paren-
theses indicates the normal state
of the switch.
Input #2 Type
Input #3 Type
Input #4 Type
Input #5 Type
Input #6 Type
Input #7 Type
Input #8 Type

iWorX® ALM2
Printed in the USA iWorX® and iView® are registered trademarks of Taco Electronic Solutions, Inc.
© 2010 Taco Electronic Solutions, Inc. LON, LONWORKS, & LONMARK are trademarks of Echelon Corporation
CONTROLS MADE EASY®
Taco Electronic Solutions, Inc., 1160 Cranston Street, Cranston, RI 02920
Telephone: [phone] FAX: [phone].
Taco (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8.
Telephone: [phone]. FAX: [phone].
Taco Electronic Solutions, Inc. is a subsidiary of Taco, Inc.
Visit our web site at: http://www.taco-hvac.com
Taco Electronic Solutions, Inc. (TES) will repair
or replace without charge (at the company's
option) any product or part which is proven
defective under normal use within one (1) year
from the date of start-up or one (1) year and six
(6) months from date of shipment (whichever
occurs first).
In order to obtain service under this warranty, it
is the responsibility of the purchaser to
promptly notify the local TES stocking distribu-
tor or TES in writing and promptly deliver the
subject product or part, delivery prepaid, to the
stocking distributor. For assistance on war-
ranty returns, the purchaser may either contact
the local TES stocking distributor or TES. If the
subject product or part contains no defect as
covered in this warranty, the purchaser will be
billed for parts and labor charges in effect at
time of factory examination and repair.
Any TES product or part not installed or oper-
ated in conformity with TES instructions or
which has been subject to accident, disaster,
neglect, misuse, misapplication, inadequate
operating environment, repair, attempted
repair, modification or alteration, or other
abuse, will not be covered by this warranty.
TES products are not intended for use to sup-
port fire suppression systems, life support sys-
tems, critical care applications, commercial
aviation, nuclear facilities or any other applica-
tions where product failure could lead to injury
to person, loss of life, or catastrophic property
damage and should not be sold for such pur-
poses.
If in doubt as to whether a particular product is
suitable for use with a TES product or part, or
for any application restrictions, consult the
applicable TES instruction sheets or in the U.S.
contact TES at 401-942-8000 and in Canada
contact Taco (Canada) Limited at 905-564-
9422.
TES reserves the right to provide replacement
products and parts which are substantially simi-
lar in design and functionally equivalent to the
defective product or part. TES reserves the
right to make changes in details of design, con-
struction, or arrangement of materials of its
products without notification.
TES OFFERS THIS WARRANTY IN LIEU OF
ALL OTHER EXPRESS WARRANTIES. ANY
WARRANTY IMPLIED BY LAW INCLUDING
WARRANTIES OF MERCHANTABILITY OR
FITNESS IS IN EFFECT ONLY FOR THE
DURATION OF THE EXPRESS WARRANTY
SET FORTH IN THE FIRST PARAGRAPH
ABOVE.
THE ABOVE WARRANTIES ARE IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR
STATUTORY, OR ANY OTHER WARRANTY
OBLIGATION ON THE PART OF TES.
TES WILL NOT BE LIABLE FOR ANY SPE-
CIAL, INCIDENTAL, INDIRECT OR CONSE-
QUENTIAL DAMAGES RESULTING FROM
THE USE OF ITS PRODUCTS OR ANY INCI-
DENTAL COSTS OF REMOVING OR
REPLACING DEFECTIVE PRODUCTS.
This warranty gives the purchaser specific
rights, and the purchaser may have other rights
which vary from state to state. Some states do
not allow limitations on how long an implied
warranty lasts or on the exclusion of incidental
or consequential damages, so these limitations
or exclusions may not apply to you.
LIMITED WARRANTY STATEMENT
Input #1 Name Each string may have up
to 16 characters.
Alarm 1 Descriptive text string associated
with an alarm when reporting an
alarm from the particular input.
Input #2 Name Alarm 2
Input #3 Name Alarm 3
Input #4 Name Alarm 4
Input #5 Name Alarm 5
Input #6 Name Alarm 6
Input #7 Name Alarm 7
Input #8 Name Alarm 8
Setting Range Default Description

iWorX® ALM2
505-013, Effective: November 12, 2010 17
© 2010 Taco Electronic Solutions, Inc.
Alarms
TROUBLESHOOTING
Diagnostic LEDs
The controller has 3 LED indicators. These indicators can aid in troubleshooting equipment operation problems. The
following table lists the functions of the controller’s LEDs in the order they appear from left to right on the unit.
Alarm Range Alarm Trigger Alarm Reset
Input # Contact Alarm
(when configured as a
switch input)
Normal,
Alarm
Occurs when the input changes to the opposite state.
For example, if the alarm is configured as Normally
Open, an alarm will be generated when the input
senses a contact closure.
Automatic
Input # Hi Limit Normal,
Hi Limit
Occurs when the temperature goes above the pro-
grammed setpoint.
Cleared when the tem-
perature goes below
(Setpoint - Hystersis).
Input # Lo Limit Normal,
Lo Limit
Occurs when the temperature goes below the pro-
grammed setpoint.
Cleared when the tem-
perature goes below the
(Setpoint + Hystersis).
LED Indication
Status – Solid green when running and configured by an LCI (networking)
– Flashing green when running and NOT configured by an LCI (stand-alone)
– Solid red when a fault condition exists (control shut down)
– Blinking Red - the controller has a device failure
– Solid Amber - The controller has not received a LCI ping message in over 10 minutes and is
part of a network.
Network – Yellow while the controller is transmitting data onto the FTT-10A network
– Green when there is network activity
– Off when there is no network activity
Service – Illuminated when the service pin is depressed or when a controller gets configured by the
LCI.

iWorX® ALM2
18 505-013, Effective: November 12, 2010
© 2010 Taco Electronic Solutions, Inc.
Figure 6: Diagnostic LEDs
Status Network Service
Troubleshooting Tips
The following table provides tips on resolving common issues.
Problem Solution
Controller is not running and Status
LED is not illuminated.
No power to controller. Verify the voltage on the controller’s power connector (24
VAC).
How do I reset the controller? The controller can be reset by the LCI, or you can cycle power to the controller. Refer
to the LCI documentation for more information on resetting the controller using the
LCI.
A pilot relay will not come on even
though the LCI indicates it is on.
Ensure that the controller and output pilot relay have been powered with 24 VAC and
the output has been correctly wired to the coil of the pilot relay. Also ensure that the
pilot relay has a 24 VAC coil. Ensure that the output jumper is configured for how the
output is wired; for example Power Isolated vs Power Sourcing.
A temperature reading is at its mini-
mum or maximum value.
The input is either shorted or open. Check the wiring for the indicated sensor. Ensure
that the input switch is in the proper position for dry contact or thermistor.
Thermistor readings fluctuate rap-
idly, sometimes by several degrees.
The controller may not be properly grounded. The controller’s ground (GND) pin
(T40) must be connected to earth ground. Also ensure that the controller’s digital
inputs are dry contacts and that no voltage is being applied or switched to the inputs.
Can I have a different hysteresis for
each input?
No, the same hysteresis applies to all analog inputs, as well as to the high and low
limits.
An alarm indicator is on when it
should be off, and off when it should
be on.
Make sure that you are using the correct type of switch (normally open or normally
closed) and that the configuration of the input as shown at the LCI matches the type
of switch you are using.

iWorX® ALM2
505-013, Effective: November 12, 2010 19
© 2010 Taco Electronic Solutions, Inc.
Getting Help
Components within an iWorX® controller, sensor, or power supply cannot be field repaired. If there is a problem with a
unit, follow the steps below before contacting your local TES representative or TES technical service.
1.Make sure controllers, sensors, and power supplies are connected and communicating to desired devices.
2.Record precise hardware setup indicating the following:
Version numbers of applications software.
Controller firmware version number.
A complete description of difficulties encountered.
Notes:

iWorX® ALM2
Printed in the USA iWorX® and iView® are registered trademarks of Taco Electronic Solutions, Inc.
© 2010 Taco Electronic Solutions, Inc. LON, LONWORKS, & LONMARK are trademarks of Echelon Corporation
CONTROLS MADE EASY®
Taco Electronic Solutions, Inc., 1160 Cranston Street, Cranston, RI 02920
Telephone: [phone] FAX: [phone].
Taco (Canada), Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8.
Telephone: [phone]. FAX: [phone].
Taco Electronic Solutions, Inc. is a subsidiary of Taco, Inc.
Visit our web site at: http://www.taco-hvac.com
Taco Electronic Solutions, Inc. (TES) will repair
or replace without charge (at the company's
option) any product or part which is proven
defective under normal use within one (1) year
from the date of start-up or one (1) year and six
(6) months from date of shipment (whichever
occurs first).
In order to obtain service under this warranty, it
is the responsibility of the purchaser to
promptly notify the local TES stocking distribu-
tor or TES in writing and promptly deliver the
subject product or part, delivery prepaid, to the
stocking distributor. For assistance on war-
ranty returns, the purchaser may either contact
the local TES stocking distributor or TES. If the
subject product or part contains no defect as
covered in this warranty, the purchaser will be
billed for parts and labor charges in effect at
time of factory examination and repair.
Any TES product or part not installed or oper-
ated in conformity with TES instructions or
which has been subject to accident, disaster,
neglect, misuse, misapplication, inadequate
operating environment, repair, attempted
repair, modification or alteration, or other
abuse, will not be covered by this warranty.
TES products are not intended for use to sup-
port fire suppression systems, life support sys-
tems, critical care applications, commercial
aviation, nuclear facilities or any other applica-
tions where product failure could lead to injury
to person, loss of life, or catastrophic property
damage and should not be sold for such pur-
poses.
If in doubt as to whether a particular product is
suitable for use with a TES product or part, or
for any application restrictions, consult the
applicable TES instruction sheets or in the U.S.
contact TES at 401-942-8000 and in Canada
contact Taco (Canada) Limited at 905-564-
9422.
TES reserves the right to provide replacement
products and parts which are substantially simi-
lar in design and functionally equivalent to the
defective product or part. TES reserves the
right to make changes in details of design, con-
struction, or arrangement of materials of its
products without notification.
TES OFFERS THIS WARRANTY IN LIEU OF
ALL OTHER EXPRESS WARRANTIES. ANY
WARRANTY IMPLIED BY LAW INCLUDING
WARRANTIES OF MERCHANTABILITY OR
FITNESS IS IN EFFECT ONLY FOR THE
DURATION OF THE EXPRESS WARRANTY
SET FORTH IN THE FIRST PARAGRAPH
ABOVE.
THE ABOVE WARRANTIES ARE IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR
STATUTORY, OR ANY OTHER WARRANTY
OBLIGATION ON THE PART OF TES.
TES WILL NOT BE LIABLE FOR ANY SPE-
CIAL, INCIDENTAL, INDIRECT OR CONSE-
QUENTIAL DAMAGES RESULTING FROM
THE USE OF ITS PRODUCTS OR ANY INCI-
DENTAL COSTS OF REMOVING OR
REPLACING DEFECTIVE PRODUCTS.
This warranty gives the purchaser specific
rights, and the purchaser may have other rights
which vary from state to state. Some states do
not allow limitations on how long an implied
warranty lasts or on the exclusion of incidental
or consequential damages, so these limitations
or exclusions may not apply to you.
LIMITED WARRANTY STATEMENT