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

iWorX® Auxiliary Sensor Module
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iWorX® ASM
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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.

iWorX® ASM
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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.

iWorX® ASM
6 505-008, Effective: November 12, 2010
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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).

iWorX® ASM
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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.

iWorX® ASM
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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

iWorX® ASM
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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