nvent SPECTRACOOL User manual

© 2018 nVent 89091001
Rev. M P/N 89091002
SPECTRACOOL
Remote Access contRol
INSTRUCTION MANUAL

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TABLE OF CONTENTS
Warranty and Return Policy.............................................................................................................................................................2
INTRODUCTION ..............................................................................................................................................................................................3
ENERGIZING THE CONTROLLER...................................................................................................................................................................3
CONTROL STATUS INDICATION....................................................................................................................................................................3
DISPLAYING AND CHANGING PROGRAM VARIABLES ..............................................................................................................................4
OPERATING PARAMETERS............................................................................................................................................................................4
ALARM PARAMETERS ...................................................................................................................................................................................4
OPERATING PARAMETERS............................................................................................................................................................................5
ALARM PARAMETERS ...................................................................................................................................................................................5
OPERATING REAL-TIME CLOCK (RTC) PARAMETERS................................................................................................................................5
DISPLAYING TEMPERATURE SENSOR #2....................................................................................................................................................5
COMPRESSOR RESTART TIME DELAY .........................................................................................................................................................5
ALARM OUTPUT CONTACT...........................................................................................................................................................................5
ALARM INPUT CONNECTION........................................................................................................................................................................5
ALARM CONDITION DISPLAY .......................................................................................................................................................................5
MASTER-SLAVE CAPABILTY (OPTIONAL).....................................................................................................................................6
ALARM PARAMETERS ...................................................................................................................................................................................6
MASTER-SLAVE ALARM INPUT CONNECTION...........................................................................................................................................7
REMOTE ACCESS CONTROL ..........................................................................................................................................................7
AIR CONDITIONER UNIT COMMUNICATION FEATURES ............................................................................................................................7
USB COMMUNICATION..........................................................................................................................................................................7
ETHERNET COMMUNICATION..............................................................................................................................................................7
MASTE-SLAVE CAPABILITY (OPTIONAL).............................................................................................................................................7
USING THE PC INTERFACE TOOL .................................................................................................................................................................8
USB COMMUNICATION MODE..............................................................................................................................................................8
ETHERNET COMMUNICATION MODE..................................................................................................................................................8
1. The Hoffman A.C. Monitor.........................................................................................................................................................................9
1.1 New Features in V3.1.0....................................................................................................................................................................9
2. Installing the Hoffman A.C. Monitor.........................................................................................................................................................9
3. Running the Hoffman A.C. Monitor.........................................................................................................................................................12
3.1 Controlling the Hoffman A.C. Monitor Display.............................................................................................................................13
3.2 Displaying ACU Faults....................................................................................................................................................................14
4. Conguring the Hoffman A.C. Monitor...................................................................................................................................................15
4.1 Scanning for New Air Conditioners...............................................................................................................................................15
4.2 Manually adding an air conditioner to the conguration ............................................................................................................16
4.3 Deleting an air conditioner from the conguration......................................................................................................................19
4.4 Modifying the air conditioner settings..........................................................................................................................................20
4.5 Importing a Conguration File.......................................................................................................................................................21
4.6 Exporting a Conguration File .......................................................................................................................................................22
4.7 Changing the ACU IP Address or SNMP Community Setting.....................................................................................................23
5. Monitoring or Conguring a Single ACU.................................................................................................................................................24
5.1 Monitoring a Single ACU................................................................................................................................................................24
5.2 Conguring a Single ACU...............................................................................................................................................................24
6.1 Enabling Hoffman A.C. Monitor Auto-Start and/or Alarm File Logging ....................................................................................25
6.2 Exporting the Alarm File to Microsoft Excel.................................................................................................................................26
7. Changing the Hoffman A.C. Monitor Language ....................................................................................................................................28
7.1 Overriding the detected language setting ....................................................................................................................................28
8. Hoffman A.C. Monitor Data Logging ......................................................................................................................................................29
8.1 Conguring an ACU for Data Logging ..........................................................................................................................................29
8.2 Exporting the Sensor Data to Microsoft Excel.............................................................................................................................30
8.3 Graphing the Temperature Sensor Data in Microsoft Excel........................................................................................................31
Basic Air Conditioning Trouble Shooting Check List - Remote Access Control Version........................................................................34
Symptoms and Possible Causes - Remote Access Control Version .......................................................................................................35
NOTE: Some of the information in this manual may not apply if a special unit was ordered. If
additional drawings for a special unit are necessary, they have been inserted. Contact nVent
Electrical if further information is required.
WARRANTY AND RETURN POLICY
https://hoffman.nvent.com/en/hoffman/warranty-information

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INTRODUCTION
The Remote Access Control is a parametric controller for the complete management of air conditioners. All
settings are pre-programmed at the factory. Cooling/heating set-points, cooling/heating differential and high /low
temperature alarm set-points can be adjusted by the user. Alarms are outputted through a relay contact and also
can be accessed through an Ethernet connection utilizing SNMP, EtherNet/IP, Modbus TCP, and PROFINET. A USB
connection is also provided and can be used to interface with the controller utilizing Modbus RTU.
MOUNTING THE CONTROLLER
The Remote Access Control must be mounted and enclosed inside a tool access enclosure. This Remote Access
Control comes with a DIN rail and a DIN rail mounting bracket; see below for DIN rail mounting dimensions. The
communication ports and alarm input/output terminals are located underneath the Remote Access Control.
When installing, allow sucient space under the Remote Access Control for access to communication ports and
alarm input/output terminals.
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ENERGIZING THE CONTROLLER
The controller is wired and programmed at the factory to be energized when power is supplied to the air
conditioner. The controller will default to the standalone operating mode when powered the rst time. Master-
Slave operating mode is optional and will require additional setup.
CONTROL STATUS INDICATION
The display has numerous symbols that indicate if the controller is heating, cooling, alarming, if the compressor
is enabled, and if the ambient fan is enabled. The 3 alpha-numeric characters further describe alarms and show
the cabinet temperature by default.
NOTE: The Slim Fit air conditioners DO NOT come standard with a heating option.

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SYMBOL COLOR ICON ON ICON FLASHING
1,2,3,4 AMBER 1. Compressor On
2. TLAN Device ID
3. Flashing at start up request is standalone mode
4. Master-Slave Mode:
1: TLAN Master.
2,3,4: TLAN Slave. Device ID 2,3,4 are not active in standalone mode
AAMBER Compressor On Active when compressor is ON
BAMBER Evaporator Fan On Start-up Request
CAMBER Not Used Not Used
DAMBER Master Unit Active when this is the TLAN Master
EAMBER Heater Active Not Used (always OFF)
FRED Alarm Active Active if there is an alarm condition
GAMBER Controller Active ON indicates power and activates all functions. OFF indicates
controller is in standby mode and all functions are OFF
HAMBER Not Used Not Used (always OFF)
NOTE: On the smart controller, the display symbols for “H” and “E” are always OFF. If they
turn ON, simply hold the “sun” button for greater than 5 sec to turn OFF. The electric
heater “E” symbol is required to minimize the heating setpoint (parameter A04) and/or defrost
setpoint (parameter A01). Then, hold the “Cooling” button for great than
5 sec to turn ON the snowflake symbol (“G”).
DISPLAYING AND CHANGING PROGRAM VARIABLES
Access: To view and/or change parameters, press and hold the Prg and Sel buttons for greater than 5 seconds.
Press the up or down arrow buttons until “22” is displayed, then press Sel button. When “S-P” is displayed, press
Sel.
Navigation: Press up or down arrows to display sub-menus then press Sel to select the desired sub-menu. In the
sub-menu, use up or down arrows to display parameters for viewing or changing and press Sel. Use Prg button to
back out of menu levels as desired.
Adjust: Use the up or down arrows to change the parameter value then push Sel to save that setting. If Sel is not
pressed, the change to the value will not be saved. Navigate to and change other parameters as desired. When
nished, push Prg to back out of the sub-menus to the main menu.
NOTE: The display will revert to normal temperature display mode if no buttons are pressed
for 60 seconds.
MODELS WITH °C CONTROLLER
Cooling turns ON at r01 (setpoint) and OFF at r01 (setpoint) – r02 (differential).
For example, using default values form the table below, cooling will turn ON at 35°C (setpoint) and turn
OFF at 30°C (setpoint – differential).
OPERATING PARAMETERS
Parameter Description Default Value Range
r01 Cooling set-point 35 C 20 C to 55 C
r02 Cooling differential 5 C -
P08 Door Open and/or smoke detected 28 4 or 28
ALARM PARAMETERS
Parameter Description Default Value Range
P16 High Temperature Alarm 55 C -
P19 Low Temperature Alarm 14 C -

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MODELS WITH °F CONTROLLER
Cooling turns ON at r01 (setpoint) + r02 (differential), and OFF at r01 (setpoint).
For example, using default values form the table below, cooling will turn ON at 87°F (setpoint +
differential), and turn OFF at 80°C (setpoint).
OPERATING PARAMETERS
Parameter Description Default Value Range
r01 Cooling set-point 80 F 72 F to 120 F
r02 Cooling differential 7 F -
P08 Door Open and/or smoke detected 28 4 or 28
ALARM PARAMETERS
Parameter Description Default Value Range
P16 High Temperature Alarm 125 F -
P19 Low Temperature Alarm 40 F -
OPERATING REAL-TIME CLOCK (RTC) PARAMETERS
Parameter Description Default Value Range
t01 Hour 00 to 23
t02 Minute 00 to 59
t03 Day 11 to 31
t04 Month 11 to 12
t05 Year 33 to 99
DISPLAYING TEMPERATURE SENSOR #2
Both the air inlet sensor (b01) and outlet or evaporator coil sensor (b02) can be reviewed at any time by
pressing the up and down arrow button on the front panel of the controller display. The display will revert to the
temperature sensor number b01 (air inlet temperature) or b02 (air outlet temperature) after 60 seconds. Both
sensors can also be read through the Ethernet and USB connections with optional remote access communication
board.
COMPRESSOR RESTART TIME DELAY
A factory set 5 minute (360 second) restart delay exists to reduce residual back pressure before allowing the
compressor to restart. The compressor will stay off for the entire restart duration after the compressor is
disabled. A ashing “1” on the controller display will indicate the unit is in a compressor restart delay while calling
for cooling. If the delay time is reduced to less than 5 minutes, this may cause reduced compressor life.
ALARM OUTPUT CONTACT
The smart controller has a normally open dry contact alarm output with a resistive load rating of 250 VAC to
3 Amp. The 6-POS connector terminals 3 and 4 (marked YEL/ALARM) located on the enclosure side of the
unit provides a connection to this output. The optional Remote Access Communication board can accept this
normally open dry contact alarm from the smart controller..
ALARM INPUT CONNECTION
The smart controller can accept a dry contact/switch input via the 6-POS connector terminals 1 and 2 (marked
WHT/DS1 and WHT/DS2), located on the enclosure side of the unit. This input is associated with the controller
display alarm mnemonic “tP” (door open and/or smoke detected). Note that the door open and/or smoke
detected is pre-programmed at the factory as “Normally Open”. The optional Remote Access Communication
board can accept this door open and/or smoke detected alarm from the smart controller. To use this feature,
simply connect the customer supplied wires from the cabinet door switch to DS1 and DS2 terminals.
ALARM CONDITION DISPLAY
There are eleven possible non-latching alarm conditions detectable by the controller and are indicated on the
controller display. All alarms can also be accessed through the Ethernet and USB connections with the optional
remote access communication board.

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Alarm
Mnemonic Description Cause Result Alarm Relay
tP General Alarm Door open and/or smoke detected Unit turns OFF for duration
of alarm Relay Contact closed
LA High Pressure Warning MALF high pressure switch opens
(see note 3 below) No effect on function N/A
LP Low Pressure Alarm Low pressure switch open (see note
4 below) No effect on function Relay Contact closed
E1 Air Inlet Temperature Sensor
Alarm Sensor failure See note 1 below Relay Contact closed
E2 Air Outlet Temperature
Sensor Alarm Sensor failure See note 2 below Relay Contact closed
Ht High Temperature Alarm,
default = 55°C
Air inlet temperature greater than
55°C No effect on function Relay Contact closed
Lt Low Temperature Alarm,
default = 14°C Air inlet temperature less than 14°C No effect on function N/A
A1 Frost Alarm Air outlet temperature less than or
equal to -1.0°C
Compressor and Condenser
fan OFF for duration of alarm Relay Contact closed
HP/HP1 High Pressure Serious Alarm High pressure switch open (see
note 5 below)
Unit turns OFF for duration
of alarm Relay Contact closed
LC Lost Communication Alarm
The Master cannot communicate
with any Slave, or the Slave cannot
communicate with the Master
No effect on function. Unit
will enter standalone mode N/A
LC1 Lost Communication Alarm The Master cannot communicate
with one of the Slaves
No effect on function. Unit
will enter standalone mode N/A
NOTE 1: Air inlet temperature sensor will default to air outlet temperature sensor. Cooling setpoint
default to 10°C.
NOTE 2: Unit continues to operate without evaporator freeze protection.
NOTE 3: The MALF high pressure switch is optional.
NOTE 4: The Low Pressure switch is optional.
NOTE 5: The High Pressure (HP) or High Pressure Serious (HP1) switch is optional.
MASTER-SLAVE CAPABILTY (OPTIONAL)
The Master-Slave capability is included as standard and can accommodate up to four (4) air conditioners in a single cabinet.
In the Master-Slave operating mode, there is a delay period of 20 seconds between startup of each unit during the startup.
For example, the master unit number 1 starts rst, unit number 2 will start after 20 seconds, followed by unit 3 and another
20 seconds, and so on.
Note the controller default operating mode is single or standalone. To initiate the Master-Slave operating mode,
parameters H24 and H25 require reconfiguration as described below. TLAN communication and Door Open cables
are also required to interconnect the air conditioners.
• Connect the door open and/or smoke detected harness to the DS1 and DS2 terminals on the enclosure side of the air conditioner
unit in parallel. The maximum length of the door switch harness between two air conditioners is 3.33 meter (10 feet). This
harness is NOT included with the Master-Slave option. It is offered separately as an accessory.
• Connect the TLAN harness to the MS1 and MS2 terminals on the enclosure side of the air conditioner unit in parallel. The
maximum length of the TLAN communication cable is 10 meters (30 feet) and 3.33 meters (10 feet) between the two air
conditioners. This harness is NOT included with Master-Slave option. It is offered separately as an accessory.
• Select one of the units in the group to be the master unit. This is indicated unit number 1
• Select the slave units, numbers 2, 3 and 4 in sequence.
ALARM PARAMETERS
Parameter Description Default Value Range
h24 Device unit ID 00 to 4
h25 Number of units 42 to 4
NOTE 6: To initiate Master-Slave operating mode, set parameter h24 (device unit ID) of master unit to 1. Set
parameter h24 of slave units as applicable. Set parameter h24 (unit number 2) to 2, set parameter h24 (unit number
3) to 3, and set parameter h24 (unit number 4) to 4.
NOTE 7: Set parameter h25 (number of units) of each unit to the same value, for example, h25 = 2 if only two units
are connected in a group, h25 = 3 if three units are in a group and h25 = 4 if four units are in a group.

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MASTER-SLAVE ALARM INPUT CONNECTION
The smart controller can accept a TLAN communication via the 6-POS connector terminals 5 and 6 marked MS1
and MS2 located on the enclosure side of the unit. This TLAN communication is associated with the controller
display alarm “LC” and “LC1”, lost communication.
To use the TLAN communication feature, simple connect the TLAN harness to MS1 and MS2 terminals and to
MS1 and MS2 of each unit in parallel.
REMOTE ACCESS CONTROL
AIR CONDITIONER UNIT COMMUNICATION FEATURES
An optional communication board offers capabilities that include Pronet, EtherNet/IP, Modbus TCP, and SNMP
protocols through Ethernet and Modbus RTU protocol via USB. Hoffman® Cooling has a PC Interface Tool
available for download that can utilize either mode to communicate with the air conditioner unit.
USB COMMUNICATION
This communication mode allows direct connection of a PC to the air conditioner unit. The protocol
supported is Modbus RTU. Use the PC Interface Tool to communicate with the air conditioner unit. A
MINI-b USB connection is provided.
ETHERNET COMMUNICATION
This communication mode allows remote connection to the air conditioner unit using SNMP, Modbus
TCP, EtherNet/IP, and Pronet protocols. Customers using their own software can download a MIB le for
SNMP, Coil_Register le for Modbus TCP, EDS le or EtherNet_IP Object le for EtherNet/IP, and GSDML
le for Pronet.
NOTE: ACU has a default IP Address of 192.168.1.2
Both Ethernet and USB communication modes allow the ability to:
• Read ACU inlet and outlet air temperatures
• Read and change Cooling Set-point and Cooling Differential
• Read and change Heating Set-point, Heating Differential
• Read and change High and Low Temperature Alarm Settings
• Read and change Gateway IP Address, Device IP Address, Subnet Mask, Trap IP Address and Community
• Read and change Unit Identication
• Read and change the state of IP addressing (static or dynamic)
• Read current Alarm Status
• Read MAC Address
• Read and change the door open and/or smoke detected switch polarity
SOFTWARE AND CONFIGURATION FILE DOWNLOADS
The PC Interface Tool, MIB le, EDS le, EtherNet_IP Object le and Coil_Register le can be downloaded
from www.nventprotect.com.
MASTE-SLAVE CAPABILITY (OPTIONAL)
In the master-slave application, only one Remote Access Communication board is required. All alarms
are communicated through the TLAN serial connection, except the door open and/or smoke detected
alarm. Door open and/or smoke detected switch polarity can be remotely changed from Normally Open to
Normally Close if needed.
Note that if the door open and/or smoke detected harness is not used, and the door switch is
wired to only one of the units, for instance, the master unit. If the power of the master unit is
OFF, the slave units will NOT detect the door open alarm and they will continue operating in
standalone mode even if the door is open.
SOFTWARE AND CONFIGURATION FILE DOWNLOADS
The PC Interface Tool, MIB le, Coil_Register le, EDS le or EtherNet_IP Object le, and GSDML le can be
downloaded from http://www.nventprotect.com/en/na/Product-Enclosure-Cooling-Heating

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USING THE PC INTERFACE TOOL
The PC Interface Tool gives the user the ability to communicate with the air conditioner unit to read/write
parameters using either Ethernet or USB connections.
USB COMMUNICATION MODE
NOTE: Before connecting unit to the PC, make note of the comm ports present. After the unit
is connected to the PC, a new comm port will be added to the list. Use this new comm port.
• From Tools menu select Use Ethernet
• When Use Ethernet is unchecked, then Comm Port menu is enabled, Device IP and Community boxes are not
shown, and USB communication can be used
• To set the comm port, choose Comm Port from the Tools menu and then select the comm port from the combo box
VIEWING AIR CONDITIONER UNIT VALUES
To view Air Conditioner Unit values
• Select the ACU Values tab
• Select the Enable Comm button (the PC Interface will now be communicating with unit)
• To stop communication select the Disable Comm button
CHANGING AIR CONDITIONER UNIT VALUES
To change ACU Values
• Select the Settings tab
• Select the value to change
• Make the change to the value
• Select the Change Setting button
• Change can be veried in ACU Values tab
VIEWING AND CHANGING ETHERNET INFORMATION
To view and change Ethernet Information
• Select Ethernet Info tab
To view Ethernet Information
• Click Read Ethernet Info button
To change to dynamically assigning IP Address Mode
• Check Use DHCP Server checkbox
• Enter Trap IP Address and Community
• Click Load Ethernet Info button
To change to statically assigning IP Address Mode
• Uncheck Use DHCP Server checkbox
• Enter Device IP Address, Subnet Mask, Gateway IP Address, Trap IP Address and Community
• Click Load Ethernet Info button
ETHERNET COMMUNICATION MODE
Each unit has two community strings. One is a Read/Write community string (defaulted to
‘private’) that can be changed by the customer (must be 4 to 8 characters long). The other is a
Read-Only community string (‘public’) and cannot be changed.

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1. The Hoffman A.C. Monitor
The Hoffman A.C. Monitor is a Windows®application for the complete management of Hoffman
air conditioners. The initial air conditioner settings; cooling/heating set-points, cooling/heating
differential and high/low temperature alarm set-points are pre-programmed at the factory, but
can be locally or remotely adjusted by the user. Alarms are output from the air conditioner relay
contacts and also can be accessed through an Ethernet network connection. A USB serial
connection is provided on the air conditioner to congure the network interface and air conditioner
settings before it is connected to a network.
Windows is a registered trademark of Microsoft Corporation in the United States and/or other countries.
When a Commboard is installed in a Hoffman air conditioner, it can communicate with an external
computer or PLC using the SNMP, EtherNet/IP, Modbus TCP, and PROFINET protocols.
1.1 New Features in V3.1.0
• Support for Master-Slave ACU congurations, with one Master ACU and up to three slave ACUs.
• Support for conguring the polarity of the door open/smoke detected switch with Control rmware version
11 or newer.
• Added support for the Mexican Spanish language
2. Installing the Hoffman A.C. Monitor
Note: If you are upgrading from V3.0.3 or V3.0.4 to V3.0.5, the location where configuration
files are stored has changed. You should follow the procedure in 4.6 Exporting a Configuration
File on page 22 to export the configuration file to a local directory, upgrade the application,
and then follow the procedure in 4.5 Importing a Configuration File on page 21 to import the
original configuration file.
• Unzip the Hoffman A.C. Monitor 3.1.0 Setup.zip le into a temporary directory.
• Double click on the Hoffman A.C. Monitor 3.1.0 Setup.exe le to start the installation process.
• Click on the “Next” button when the installation window opens.

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• If the default installation directory is OK click the “Next” button.
• By default, the installation will put the User’s Manual and the Serial USB driver in the C:\Users\<your userid>\
Documents\Hoffman directory. If you don’t want the User’s Manual, uncheck the box. If it is OK, click the “Next”
button.
• If the default Start Menu folder “Hoffman” is OK, click the “Next” button.

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• Click the “Install” button to start the installation.
• Click on the “Finish” button when the installation completes.
• The Hoffman A.C. Monitor application is now ready to use. You can start the program by clicking “Start->All
Programs->Hoffman->Hoffman A.C. Monitor” menu, or on the Desktop icon.

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3. Running the Hoffman A.C. Monitor
The installation program added an entry to the list of programs in the Windows “Start->All
Programs->Hoffman” menu, and added an icon on the Desktop.
Hoffman A.C. Monitor
Click on “Hoffman A.C. Monitor” in the “Start->All Programs->Hoffman” menu or double-click
on the “Hoffman A.C. Monitor” link on the Desktop to start the program. The program will
detect the default language for the PC and congure the program for English, German, Mexican
Spanish, Polish, Russian, or Simplied Chinese. If the PC is congured for any other language, the
application’s language will congure to English.
Note: If no air conditioners have been configured, a window will open stating that the
configuration file does not exist.
Click “OK” button to create empty conguration les and to close the window.
Note: If you exported a configuration file from a previous version of the application, now is
the time to import the original configuration file by follow the procedure in 4.5 Importing a
Configuration File on page 21.
The application will start with the “Single Hoffman A.C. Monitor” tab selected.
Click on the “Multiple Hoffman A.C. Monitor” tab to select the Multiple Hoffman A.C. Monitor
mode.

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Note: You will need to perform the configuration procedure or import a configuration file
before you can monitor multiple air conditioners. (See 4. Configuring the Hoffman A.C.
Monitor on page 15)
3.1 Controlling the Hoffman A.C. Monitor Display
When you click on the “Multiple A.C. Monitor” tab, the conguration le is read and the
corresponding air conditioners are displayed. You can click on the column headings to change the
sequence order of the air conditioners that are displayed and polled.
For example, if you added an air conditioner and want the air conditioners displayed in IP address
order, just click on the “IP Address” column header. The air conditioners will now be displayed
in increasing IP Address order. You will see an “up arrow” to the right of the “IP Address” that
indicates the increasing IP address order.
If you click on the “IP Address” column header again, the air conditioners will now be displayed
in decreasing IP Address order. You will see a “down arrow” to the right of the “IP Address” that
indicates the decreasing IP address order. The same procedure works with any column in the
display.
Note: You can click on the “Alarm” column header to display air conditioners with a fault
condition at the top of the list.
Note: If you would like the current display order to be permanent, Click on “Tools” menu, then
“Change Multiple ACU Configuration” in the pull-down menu, and, finally, click on the “Save
Configuration File” button.

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3.2 Displaying ACU Faults
If “Alarm File Logging” is enabled, (See 6.1 Enabling Hoffman A.C. Monitor Auto-Start and/or
Alarm File Logging on page 25) and the Hoffman A.C. Monitor application detects an ACU fault,
the details of the fault(s) will be stored in an XML le.
The contents of the Alarm XML le can be displayed by clicking on the “ACU Faults” tab. The
default order is descending by date/time so the latest faults will be at the top of the list. You can
click on the column headings to change the order of the air conditioner faults display.
Note: If a new fault is logged when the “ACU Faults” tab is selected, the screen will refresh and
display all of the faults in descending date/time order.

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4. Conguring the Hoffman A.C. Monitor
After the Hoffman A.C. Monitor application has been started for the rst time, you will need to
enter the network IP address of each air conditioner.
4.1 Scanning for New Air Conditioners
The Hoffman A.C. Monitor application can scan a Class-C network subnet for air conditioners that
are not currently congured. The application will poll each IP address on a network subnet. If it
nds an air conditioner that is not currently congured, it will add it to the conguration.
Click “Tools” menu and select “Change Multiple ACU Conguration” in the pull-down menu.
Note: The MAC Address displayed to the right of the IP address corresponds to the MAC
Address printed on the label on the air conditioner. You can use the MAC Address shown in
the A.C. Monitor to confirm that the IP address for a given air conditioner is correct.
Click the “Scan for new ACUs” button. A window will open where the Class-C network subnet to
scan can be entered.

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Enter the Class-C network subnet that contains the new air conditioners in dotted format and click
on the “Start” button. The last digit should be a “0” (zero). Any new air conditioner found will be
added to the conguration.
Note: You must save the configuration file to make the new air conditioners permanent.
Note: With the default network configuration, it takes approximately 4 seconds to poll
each possible IP address when looking for new air conditioners. There are 254 possible IP
addresses on a subnet, so it will take more than 15 minutes to scan a complete subnet. You
can reduce the default IP Retries to 1 by clicking on the down-arrow next to the IP Retries box,
and reduce the default IP Time out to shorten the scanning time.
Note: A future version of this application will allow the use of an arbitrary subnet mask.
Note: In a Master/Slave configuration the Master ACU is the only ACU connected to the
network. The Master ACU will be added to the configuration, but the Slaves will not be added.
The Slave ACUs will need to be manually added to the configuration.
4.2 Manually adding an air conditioner to the conguration
Click the “Tools” menu and select “Change Multiple ACU Conguration” from the pull-down menu.

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The asterisk“*” at the left of the empty row indicates that it is ready to edit the conguration. Click
once on the empty cell to the right of the asterisk “*” and below the “Group” heading to select
the cell. Enter the name of the Group for this air conditioner. The Group can be used to organize
the air conditioners by geographic location, plant, work cell, etc. The Group can be any text; for
example, Anoka, Welding, Router, etc. As you enter the Group you will see a “pencil” icon at the
left of the row. When you have nished entering the Group, press the “Tab” key. The “pencil” icon
will change to a triangle and the “IP Address” cell will be highlighted. Click on the “IP Address” cell
to allow text editing. Enter the IP address for the air conditioner in “dotted” format, for example
“10.82.149.247”. When you have nished entering the IP address, press the “Tab” key twice and
the “Community” cell will be highlighted. Click on the “Community” cell to allow text editing. If
the SNMP Community is set to “public” the sensors and alarms can be read, but conguration
changes to the air conditioner controller will not be allowed. The factory default value for the
SNMP Community can be changed in the air conditioner to another value to improve security. If
you plan to use the Hoffman A.C. Monitor application to make conguration changes to the air
conditioner controllers, you will need to set the SNMP Community to the factory default value of
“private”, or to the customized value. When you have nished entering the Community, press the
“Enter” key.

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For a Master-Slave conguration, each ACU in the Master-Slave set will need to be congured
separately. When you add an ACU, the Master ID will default to 0 to indicate that it is a standalone
ACU. You will need to change the Master ID to a 1 for the Master ACU. When you add a Slave ACU,
use the same IP address as the Master ACU, but change the Master ID to correspond to the Slave
ACUs ID in the range of 2-4. When the ACUs are polled, the application will append the Master/
Slave ID to the Unit ID to make tracking easier.
The Hoffman A.C. Monitor application screen should look like the image above. Click the “Save
Conguration File” button to save the current air conditioner conguration.
Click the “Yes” button to save the current Hoffman A.C. Monitor conguration.
Repeat the above steps to add additional air conditioners to the conguration.

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4.3 Deleting an air conditioner from the conguration
Click the “Tools” menu and select “Change Multiple ACU Conguration” from the pull-down menu.
Click the box to the left of the row for the desired air conditioner. All cells in the row will highlight.
Press the “Delete” key.
Click the “Yes” button to conrm deletion of the air conditioner. Click the “Save Conguration File”
button to save the current air conditioner conguration.
Click the “Yes” button to save the current air conditioner conguration.
Repeat the above steps to delete more air conditioners from the conguration.
Note: You can hold the “CTRL” key on your keyboard down and click on multiple ACUs. When
you press the “Delete” key the application will ask if it is OK to delete each of the selected air
conditioners.

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4.4 Modifying the air conditioner settings
When you enable polling of the air conditioners for the rst time, the Hoffman A.C. Monitor
application will determine that the Unit ID, Cooling Set-Point, Cooling Differential, Heating Set-
Point, Heating Differential, High Temperature Alarm and Low Temperature Alarm settings in the
conguration le are empty. The application will obtain the current values from the air conditioner
and populate the conguration le. To populate these elds, you can click on the “Enable Polling”
button, wait for it to cycle through all of the air conditioners, click the “Disable Polling” button,
click the “Tools” menu and select “Change Multiple ACU Conguration” from the pull-down menu,
and, nally, click the “Save Conguration File” button to save the conguration values from the air
conditioners.
If you need to change any of the air conditioner set-points, you can click the “Tools” menu and
select “Change Multiple ACU Conguration” from the pull-down menu, click twice on a cell in the
conguration display, change the value, and select “Save Conguration File” button. To reprogram
the set-points in the air conditioner, click on the box to the left of the “Group” cell for the desired air
conditioner, and select “Reprogram All Selected ACUs” button. If you would like to reprogram more
than one air conditioner at a time, you can hold the “CTRL” key down while you select more than
one air conditioner controller. Clicking on the “Congure All Selected ACUs” button will reprogram
all of the selected air conditioners.
Note: If the air conditioner does not respond to the reprogramming commands, the IP address
cell will be highlighted in red. If an individual setting cannot be reprogrammed, the settings
cell will be highlighted in red.
Note: If the SNMP Community is set to “public”, you cannot change the settings of an air
conditioner. The SNMP Community must be set to the same value as the air conditioner is
programmed. The factory default value is “private”.
Note: The IP address and SNMP Community settings cannot be changed from the Multiple
Hoffman A.C. Monitor tab. You can use the Single ACU Ethernet Info tab to change the IP
address or SNMP Community settings.