iWorX ASM2 User guide

© 2010 Taco Electronic Solutions, Inc. 1
Application Guide 505-008
ASM2 Auxiliary Sensor Module
Self-Contained Interoperable Controller Model UCP-1
SUPERSEDES: September 23, 2010 EFFECTIVE: November 12, 2010
Table of Contents
ASM2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Purpose of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . 3
Representations and Warranties . . . . . . . . . . . . . . . . . 3
Applicable Documentation . . . . . . . . . . . . . . . . . . . . . . 4
Typical Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FCC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Before Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
About this Document . . . . . . . . . . . . . . . . . . . . . . . . 5
Inspecting the Equipment . . . . . . . . . . . . . . . . . . . . 6
What is Not Included with this Equipment . . . . . . . . 6
Equipment Location . . . . . . . . . . . . . . . . . . . . . . . . . 6
Selecting a Power Source . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting the Device . . . . . . . . . . . . . . . . . . . . . . . . 6
Routing Cabling to the Device . . . . . . . . . . . . . . . . . 7
Grounding the Device . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting Input Devices . . . . . . . . . . . . . . . . . . . . 8
Other Connections. . . . . . . . . . . . . . . . . . . . . . . . . . 9
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Application Overview . . . . . . . . . . . . . . . . . . . . . . . . . 11
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . 12
Outdoor Air Temperature. . . . . . . . . . . . . . . . . . . . 12
Outdoor Air Humidity . . . . . . . . . . . . . . . . . . . . . . . 12
Supply Water Temperature . . . . . . . . . . . . . . . . . . 12
Indoor Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Energy Consumption Monitoring . . . . . . . . . . . . . . 12
Unit Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Automatic Configuration . . . . . . . . . . . . . . . . . . . . 13
Controller Identification . . . . . . . . . . . . . . . . . . . . . . . 14
Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . 15

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ASM2
The ASM is a stand-alone microprocessor based controller for monitoring auxiliary sensors. The application would
include unitary heating, ventilating, and air conditioning (HVAC) equipment.
Overview
Analog inputs are provided for outdoor air temperature, outdoor air humidity, indoor air humidity, and supply water tem-
perature. A “unit enable” digital input is also provided for confirmation to water dependant systems. For energy monitor-
ing, digital inputs for meter pulses and end-of-interval signals are also provided.
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
• Outside air temperature measurement
• Outside air humidity measurement
• Supply water temperature measurement
• Indoor humidity measurement
• Energy meter digital input for pulse counting
• Energy monitoring “end of period” digital input
• Network outputs to LCI for load shedding functions
• Current energy measurement
• Current daily energy consumption measurement
• Log of daily energy consumption (previous 30 days)
• Log of interval energy usage (previous 96 intervals)
• “Unit Enable” digital input
•LONWORKS interface to building automation systems.
• Automatic configuration with the LCI
PURPOSE OF THIS GUIDE
The Application Guide provides application information for the ASM Controller.
The reader should understand basic HVAC concepts, intelligent environmental control automation, and basic LON-
WORKS networking and communications. This Application Manual 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
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® ASM shall only be used for the applications identified in the product specifications and for no other pur-
poses. For example, the iWorX® ASM is not intended for use to support fire suppression systems, life support systems,
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.

iWorX® ASM
4 505-008, Effective: November 12, 2010
© 2010 Taco Electronic Solutions, Inc.
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.
APPLICABLE DOCUMENTATION
See the table below for additional documentation that may be applicable to this controller.
Typical Use
ASM2
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.

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INSTALLATION GUIDE
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 only copper conductors.
Static Electricity
Static charges produce voltages that can damage this equipment. Follow these static electricity precautions when han-
dling 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.
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 document are for the ASM2 module, which provides global sensor inputs to other iWorX control-
lers.

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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.
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 before installing or servicing this equipment or modifying any wiring.
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).

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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.

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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 4,6,9,12,15,18 and 38 are connected internally on all ASM2 controllers. Disconnect
ALL power sources when installing or servicing this equipment to prevent electrical shock or equipment
damage.
Figure 2: ASM2 Terminal Connections
Connecting Input Devices
Outdoor Humidity (OAH)
The sensor must be 0-10 VDC, linear. To connect the Outdoor Humidity sensor to the unit, connect the positive wire
from the sensor to OAH (T19) and the other wire to the adjacent common (T18).

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Outdoor Air (OAT)
To connect the Outdoor Air thermistor to the unit, attach one wire from the thermistor to OAT (T17) and the other wire to
the adjacent common (T18). The thermistor used must be 10K Precon Type III.
Supply Water Temperature (SWT)
To connect the Supply Water Temperature thermistor to the unit, attach one wire from the thermistor to SWT (T16) and
the other wire to the adjacent common (T15). The thermistor used must be 10K Precon Type III.
Indoor Humidity (IAH)
The sensor must be 0-10 VDC, linear. To connect the Indoor Humidity sensor to the unit, connect the positive wire from
the sensor to IAH (T14) and the other wire to the adjacent common (T15).
Energy Monitor (EM)
The Energy Monitor contact must be a normally open digital switch. To connect the Energy Monitor contact to the unit,
connect one wire from the contact to EM (T13) and the other wire to the adjacent common (T12).
End of Interval (EMS)
The End of Interval contact for energy monitor sync must be a normally open digital switch. To connect the End of Inter-
val contact to the unit, connect one wire from the contact to EMS (T11) and the other wire to the adjacent common
(T12).
Unit Enable (EN)
The Unit Enable contact must be a normally open (closed only when enabled) digital switch. To connect the Unit
Enable contact to the unit, connect one wire from the contact to EN (T10) and the other wire to the adjacent common
(T9).
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
Outdoor Humidity
• 0-10 Volts DC
Outdoor Air, Supply Water Temperature
• Precon Type III 10K thermistor

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Indoor Humidity
• 0-10 Volts DC
Energy Monitor, End of Interval
• Normally open
• Dry contact
•5Volts DC Max
Unit Enable
• Normally open (closed when active)
• Dry contact
•5Volts DC Max
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).
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
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
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

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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
APPLICATION OVERVIEW
The controller provides outdoor temperature, outdoor humidity, indoor humidity, supply water temperature, energy
monitoring readings, and unit enable status to other devices on the network. Figure 3 illustrates a typical controller
application.
Figure 3: ASM Application
ASM2
An input is provided to read an outside air temperature sensor. An additional input is provided to read an outside air
humidity sensor. The current values of both sensors are made available to other devices on the network. The outdoor
temperature and humidity are used to calculate the outdoor enthalpy. The enthalpy is required by certain types of con-
trollers to determine if “free cooling” is available from the economizer.
An additional input is provided to read an indoor air humidity sensor. The current value of the sensor can be used by
other devices on the network as a “global” indoor humidity value, for calculating indoor enthalpy.
An input is provided to read a supply water temperature sensor. The current value of the sensor is made available to
other devices on the network. The supply water temperature is required by certain types of controllers to achieve auto-
matic summer/winter changeover.
A digital input is provided to read a contact closure for “unit enable” purposes. The ASM can make the status of that
contact available to other devices on the network. Typically, “unit enable” information is utilized by heat pumps to deter-
mine when the water supply is flowing.
The ASM can also monitor energy consumption. One digital input accepts energy consumption pulses from a utility
meter, another other accepts a timing pulse from the utility. This pulse indicates the end of an energy-monitoring period,
and implicitly signals the beginning of a new period.

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SEQUENCE OF OPERATION
This section describes the sequence of operation for the controller.
Outdoor Air Temperature
The outdoor air temperature sensor input is for a thermistor. The controller reads the sensor and converts it to a tem-
perature once a second. The converted value is made available as a network variable output.
Outdoor Air Humidity
The outdoor air humidity sensor input is 0 to 10 volt scaled device. The controller reads the sensor and converts it to
humidity once a second. The converted value is made available as a network variable output.
Supply Water Temperature
The supply water temperature sensor input is for a thermistor. The controller reads the sensor and converts it to a tem-
perature once a second. The converted value is made available as a network variable output.
Indoor Humidity
The indoor humidity sensor input is a 0 to 10 Volt scaled device. Every second, the controller reads the sensor and
converts the reading to a humidity measurement. The converted value is made available as a network variable output.
Energy Consumption Monitoring
The ASM monitors pulses from the energy meter input, stores a count of them internally, and reads that count every 30
seconds. Once read, the count is stored and used to calculate a new KWh value. The count is scaled using a value
programmed at the Local Control Interface. This scaling factor tells the ASM how many pulses indicate 1 KWh of
energy. The KWh value can be viewed on the LCI2 as “Current Reading”. These periodic readings are accumulated
until the end of an interval.
The end of the monitoring interval can be determined in two ways. The first method is to have the ASM determine the
length of the interval. At power up, the ASM defaults to using its internal timer. The interval length for the internal timer
can be programmed at the LCI2.
The second method is by sensing a hardwired signal from the energy meter. The meter momentarily closes this input to
indicate the end of an interval. If the ASM receives a synchronization pulse on its “end of interval” input, it automatically
switches over to using the external signal instead of the internal timer. If no external signal is received for more than
two hours, the ASM reverts to using its internal timer.
Once the end of the interval is determined, a new interval reading is then calculated using enough of the 30-second
readings to form the interval. The calculation is performed on a sliding window of data, with the newest data replacing
the oldest. The daily total is then updated by adding the interval value, and load shedding is calculated.
The ASM provides a method for detecting if energy consumption is above a preset level. This enables the system to
perform load-shedding functions. Two alarm levels are available. If energy consumption for an interval exceeds the first
setting, the energy consumption alarm will be set to level one. If the alarm is at level one, consumption will be com-
pared to the second setting. If consumption exceeds the second setting, the alarm will be set to level two. If consump-
tion drops below the second setting, the alarm level will be dropped to one, and if it drops below the first setting the
alarm level will be cleared to zero.
Unit Enable
The unit enable input is a contact input that is closed while the unit is enabled. The controller reads the input once a
second. The current value is made available as a network variable output.

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Automatic Configuration
The ASM2 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 ASM2 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 ASM2 with LNS or other LONWORKS
tools if they wish.
The LCI also provides network supervision of the ASM2. The LCI periodically sends a "ping" message to the ASM2,
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.

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CONTROLLER IDENTIFICATION
Once the ASM is properly installed and recognized by the Local Control Interface (LCI2), the LCI2 can be used to con-
figure the settings of the controller. This section describes the commands available on the LCI2 for configuration of the
ASM, and the meanings and default values for controller parameters. For more information on using the LCI2, see the
LCI2 Application Guide.
Inputs
The Inputs screen displays the current values of the ASM2’s inputs. These values cannot be changed.
Configuration
The Setup screen gives you access to controller settings.
All Settings
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.
Input Range Description
Outside Temp -30 to 230 °F (-34 to 110 °C) Temperature reported by the OAT
sensor.
Outside Humidity 0.00 to 100.00% Humidity reported by the OAH sen-
sor.
Water Temp -30 to 230 °F (-34 to 110 °C) Temperature reported by the SWT
sensor.
Inside Humidity 0.00 to 100.00% Humidity reported by the IAH sen-
sor.
Unit Enable Off, On Status of the EN switch.
Current Reading 0 to 65535 KWh Energy consumption during the last
interval.
Daily Reading 0 to 65535 KWh Running total of energy consumed
today. Resets at midnight.
Setting Range Default Description
Scaling Factor 0 to 65535 pulses/KWh 12 pulses/KWh Number of pulses per KWh of energy consumed.
Load Level 1 0 to 65535 KWh 65535 KWH Consumption per interval that will trigger a level one
alarm.1
1. Set both levels to 65535 to disable this feature.
Load Level 2 0 to 65535 KWh 65535 KWH Consumption per interval that will raise a level one
alarm to level two.1
Reading Interval 1 to 30 minutes 15 minutes Length of the energy consumption monitoring interval
when using the internal timer.

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Figure 4: ASM2 Controller LEDs
Status Network Service
Troubleshooting Tips
This section provides remedies for common problems.
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.
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).

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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.
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 infor-
mation on resetting the controller using the LCI.
The 10K thermistor reading is at its maximum or
minimum.
The input is either shorted or open.
Thermistor readings fluctuate rapidly, some-
times 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.
Problem Solution

iWorX® ASM
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
Notes: