Taco Electronic Solutions iWorx HPU2 User manual

© 2013 Taco Electronic Solutions, Inc. 1
Installation Guide 502-025
HPU2 & HPU3 Water Source Heat Pump Controller
Self-Contained Interoperable Controller Model UCP-1
SUPERSEDES: February 28, 2012 EFFECTIVE: April 17, 2013
Plant ID: 001-3982
SPECIFICATIONS
Electrical Inputs
Cabling: twisted shielded pair, 18 AWG recommended—500 feet max. (152 meters), 10 bit resolution
Space Temp (optional): Precon Type II or Type III 10k thermistor
Supply Air Temp (HPU3 only): Precon Type III 10K thermistor
Heat Pump Power Transducer (HPU3 only): 0 to 10 Volts DC
Equipment Status, High Pressure Alarm (HPU3 only), Low Pressure Alarm (HPU3 only): Dry Contact, Normally Open,
5 Volts DC Max
Thermostat Network: 12 Volt nominal, internally limited to 0.04 A (TS300 Series)
Electrical Outputs
Modulated Fan (HPU3 only): Analog 0-10 Vdc, 2K Ohm minimum load, 8 bit resolution
Stage 1, Stage 2, Reversing Valve, Fan, Dehumidification (HPU3 only): Triac 24 VAC, 1A @ 50C, 0.5A @ 60C, limited
by the Class 2 supply rating
Recommended Sensor Wire
Recommended LON Bus FTT-10A Network Wire
Speed: 78KBPS
Max Volts: 42.4 Volts DC
Cabling: Maximum node-to-node distance: 1312 feet (400 meters); Maximum total distance: 1640 feet (500 meters)
Mechanical
Dimensions: 5.55” (141mm) high, 6.54” (166 mm) wide, 1.75” deep (44 mm), ABS
Controller Weight: 0.70 pounds (0.32 kilograms)
Shipping Weight: 1.0 pounds (0.46 kilograms)
Processor: 3150 Neuron 10 MHz
Flash: 48 Kilobytes
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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SRAM: 8 Kilobytes
Termination: 0.197” (5.0 mm) Pluggable Terminal Blocks, 14-22 AWG
Temperature: 32 °F to 140 °F (0 °C to 60 °C)
Humidity: 0 to 90%, non-condensing
UL Listed for US and Canada, Energy Management Equipment PAZX and PAZX7
FCC Part 15 Class A compliant
Equipment Location
Abide by all warnings regarding equipment location provided in this document. This equipment is suitable for
indoor use only. 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.
If the equipment is to be installed outdoors, it must be contained within a protective enclosure that maintains internal tem-
perature 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 are connected
to the equipment.
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.
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 control-
ler.
The controller and sensor power supplies 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 PRECAUTIONS
General
CAUTION: This symbol is intended to alert the user to the presence of important installation and maintenance
(servicing) instructions in the literature accompanying the equipment.
CAUTION: Risk of explosion if battery is replaced by an incorrect type. Contains lithium type battery; dispose
of properly.
WARNING: Electrical shock hazard. Disconnect ALL power sources when installing or servicing this equip-
ment to prevent electrical shock or equipment damage.
Make all wiring connections in accordance with these instructions and in accordance with pertinent national and local elec-
trical codes. Use only copper conductors that are suitable for 167 °F (75 °C).

iWorx® HPU Series
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Static Electricity
Static charges produce voltages that can damage this equipment. Follow these static electricity precautions when handling
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.
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 equipment can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful inter-
ference to radio communications. However, there is no guarantee that interference will not occur in a particular 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.
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 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.
Grounding the Device
The ground terminal (T40) must be securely connected to earth ground. Failure to properly ground this equip-
ment 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).
Power
Requires: 24VAC (20VAC to 28VAC), requires an external Class 2 supply
Consumes: 7.2W with no external loads, maximum limited by the Class 2 supply rating

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Staged Heat Pump
Staged Heat Pump:
• 2 Stage Heating/Cooling,
• Reversing Valve
• Equipment Status
Sensors Required: Wall Mount Temperature Sensor
Added Module Required: Add LHP or ASM module
and make HPU Member
NOTE: HPUs must be associated with an LHP
or an ASM with the Plant Enable input con-
nected to a loop flow switch. If a loop flow
switch is not used, the input must be shorted.
Setup Instructions
1.Press Controllers from main screen
2.Select required HPU from controller list and press
appropriate controller.
3.Press All Settings.
4.Press Thermostat.
5.The Thermostat menu opens.
a.Select Type of thermostat. Slink=TS300 Series
Stats, Precon III = TS100 Series Stats
b.Select desired occupancy extension (TS300 Series
Only)
c. Select Setpoint Temperature Offset which will
trigger an alarm.
d.Select Temperature Offset. This value is a cali-
bration of room temperature from a separate cali-
brated device if required (Precon II or III Only).
e.Accumulated Ext Occ indicates the minutes of
occupancy override of the DXU.
f. Press Save.

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6.Press Setpoints.
7.The Setpoints menu opens.
a.Select Setpoint.
b.Select Cooling Offset.
c. Select Heating Offset.
d.Select USER setpoint adjustable limits (SP Adjust
Limit). Setting is +- setpoint.
e.Select unoccupied cooling setpoint (Unocc Cool).
f. Select unoccupied heating setpoint (Unocc Heat).
g.Press Save.
8.Press Comp. Stages.
9.The Comp. Stages menu opens.
a.Select number of Stages of equipment (1 or 2).
b.Select the stage Control Band in degrees. Cannot
be set to 0.
c. Select the Stage Time in minutes. Cannot be set to
0.
d.Press Save.
10.Press Fan Type.
11.The Fan Type menu opens. Select:
a.“ON” = On in Occupied mode, cycles with Heat/
Cool call in Unoccupied.
b.“Auto” = cycles with Heat/Cool call always.
c. Press Save.
12.Press Rev. Valve Action.
13.The Rev Valve Action menu opens.
a.Select “Energize on Heat” or “Energize on Cool.”
NOTE: Consult Heat Pump Equipment Installation
Instructions to determine correct selection.
b.Press Save.

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HPU3 Supplemental Instructions - Adding Dehumidification Control
Controlled: 2 Stages Heating/Cooling, Reversing
Valve, Equipment Status, Dehumidification
Sensors Required: Wall Mount Temp/Humidity (Taco
Part #TS302-1 or TS304-1 ) and Supply Air Temp
Added Module Required: Add LHP or an ASM with
the Plant Enable input connected to a loop flow switch.
If a loop flow switch is not used, the input must be
shorted.
Setup Instructions
1.Press Controllers from main screen.
2.Select required HPU3 from controller list and press
appropriate controller.
3.Press All Settings.
4.Press Dehumidification.
5.The Dehumidification menu opens.
a.Select Type of Dehumidification.
- “Occupied” - Only active in occupied periods.
- Or “Always Enabled”
b.Select Humidity Setpoint in RH%.
c. Select Shutoff Offset in degrees F. Shutoff offset
sets the degrees of overcooling allowed before
dehumidification is turned off.
d.Press Save.
6.Press Next 3.
7.Press SAT Setpoints.
8.The SAT Setpoints menu opens.
a.Select Supply Air Temperature Cool SetPt in
degrees.
b.Select Supply Air Temperature Heat SetPt in
degrees.
c. Press Save.

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HPU3 Supplemental Instructions - Adding Modulating Fan Control
Controlled: 0-10VDC Modulating Fan Input on Heat
Pump for control of ECM fan Motor
Setup Instructions
1.Press Controllers from main screen.
2.Select required HPU3 from controller list and press
appropriate controller.
3.Press All Settings.
4.Press Next 3.
5.Press Mod Fan Settings.
6.The Mod Fan Settings menu opens.
a.Select Min Output Voltage (VDC) for VFD Drive
(commonly 0-2VDC).
b.Select Max Output Voltage (VDC) for VFD drive
(commonly 10VDC).
c. Press Save.
d.NOTE: DO NOT change factory KP/KI settings.
Please review Factory KP/KI Setting White Paper #
508-001.

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TROUBLESHOOTING TIPS
This section provides remedies for common problems.
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 application software.
Device and/or firmware version number.
A complete description of difficulties encountered.
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 infor-
mation on resetting the controller using the LCI.
The fan will not cycle on after the equipment
status input alarm has been resolved
If the controller was previously in a fan fault condition, the con-
troller must be reset before proper operation can be restored.
The fan and heat/cool pilot relays will not come
on even though the LCI indicates it is on.
Ensure that the controller and output pilot relay have been pow-
ered 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.
The 10K thermistor reading is at its maximum or
minimum.
The input is either shorted or open.
The Heat or Cool outputs will not come on even
though the space requires conditioned air.
Is there water flow in the system? Verify the associated CCU2
or LHP2 controller are operating and the HPU2 is a member of
the controller. If there is no CCU2 or LHP2 connected, then the
Unit Enable input of the ASM2 must detect water flow (On).
Thermistor readings fluctuate rapidly, some-
times by several degrees.
The controller is not 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.
How do I associate my HPU controllers with the
LHP2?
Use the LHP2's grouping mechanism, specifically Members on
the LHP2 HVAC Setup screen of the LCI. Only HPU controllers
may be associated with the LHP2.
What is Save for in the Members screen and
when do I press it?
This button stores network information into the LHP2 about the
controllers in its group. Press this button when you have made
any changes to the grouping.
What iWorx® controllers can be part of a
LHP2's group?
Only HPU controllers can be part of the LHP2's group and
demand cooling or heating from it.
Under what conditions does the HPU require a
reset for normal operation.
There is one condition that requires a reset: - Equipment failure

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APPLICABLE DOCUMENTATION
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 responsibility to ensure
that the latest version of the Document is being used.
iWorx® products shall only be used for the applications identified in the product specifications and for no other purposes.
For example, iWorx® products are 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.
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, inadequate
operating environment, repair, attempted repair, modification or alteration, or other abuse. For further information, 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.
Notes:
Description Audience Purpose
iWorx® HPU2 Application
Guide, Document No. 505-025
iWorx® HPU3 Application
Guide, Document No. 505-035
– Application Engineers
– Wholesalers
– Contractors
– Start-up Technicians
– End user
Provides instructions for setting up and using the iWorx®
HPU2 and HPU3.
iWorx® LHP2 Application
Guide, Document No. 505-024
– Application Engineers
– Wholesalers
– Contractors
– Start-up Technicians
– End user
Provides instructions for setting up and using the iWorx® LHP
controller.
iWorx® LCI2 Application
Guide, Document No. 505-002
iWorx® LCI3 Application
Guide, Document No. 505-050
– Application Engineers
– Installers
– Service Personnel
– Start-up Technicians
– End user
Provides instructions for setting up and using the iWorx® Local
Control Interface.
www.iWorxWizard.com – Application Engineers
– Wholesalers
– Contractors
An on-line configuration and submittal package generator
based on user input. Automatically generates bill of materials,
sequence of operations, flow diagrams, wiring diagrams,
points and specifications.
Additional Documentation LonWorks FTT-10A Free Topology Transceiver User’s Guide, published by Echelon Cor-
poration. It provides specifications and user instructions for the FTT-10A Free Topology
Transceiver. See also: www.echelon.com/support/documentation/manuals/transceivers.

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iWorx® HPU Series
Printed in the USA iWorx® and iView® are registered trademarks of Taco Electronic Solutions, Inc.
© 2013 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 distributor or TES in
writing and promptly deliver the subject product
or part, delivery prepaid, to the stocking distribu-
tor. For assistance on warranty returns, the pur-
chaser 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 operated
in conformity with TES instructions or which has
been subject to accident, disaster, neglect, mis-
use, misapplication, inadequate operating envi-
ronment, repair, attempted repair, modification or
alteration, or other abuse, will not be covered by
this warranty.
TES products are 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 sold for such purposes.
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 applica-
ble 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 similar
in design and functionally equivalent to the
defective product or part. TES reserves the right
to make changes in details of design, construc-
tion, 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 REPLAC-
ING 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 conse-
quential damages, so these limitations or exclu-
sions may not apply to you.
LIMITED WARRANTY STATEMENT