nvent SPECTRACOOL User manual

© 2021 nVent 89209827
Rev. A P/N 89209827
SPECTRACOOL
Remote Access contRol
INSTRUCTION MANUAL

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TABLE OF CONTENTS
Warranty and Return Policy............................................................................................................................................................. 2
INTRODUCTION .............................................................................................................................................................................................. 3
DIGITAL THERMOSTAT CONTROLLER (OPTIONAL) .................................................................................................................... 3
OVERVIEW....................................................................................................................................................................................................... 3
ENERGIZING THE CONTROLLER .................................................................................................................................................................. 3
CONTROLLER STATUS INDICATION............................................................................................................................................................. 3
DISPLAYING AND CHANGING PROGRAM SETTINGS ................................................................................................................. 6
TO VIEW OR ACCESS THE SETTINGS .......................................................................................................................................................... 6
Folder Menu Access............................................................................................................................................................................... 6
Parameter settings ................................................................................................................................................................................. 6
Real-Time-Clock Setting......................................................................................................................................................................... 6
View Alarms ............................................................................................................................................................................................ 7
View Alarms in the Alarm History Folder.............................................................................................................................................. 7
To Reset the Alarms in Alarm History Folder....................................................................................................................................... 8
To Reset Parameters to Factory Default .............................................................................................................................................. 8
DISPLAYING TEMPERATURE DATA ON SCREEN ........................................................................................................................................ 8
COMPRESSOR RESTART TIME DELAY......................................................................................................................................................... 8
ALARM OUTPUT CONTACT........................................................................................................................................................................... 8
ALARM INPUT CONNECTION........................................................................................................................................................................ 9
PRIMARY-SECONDARY (PS) MODE.............................................................................................................................................................. 9
Connecting units together in Primary/Secondary mode..................................................................................................................... 9
LEAD-LAG (LL) MODE .................................................................................................................................................................................. 10
Connecting units together in Lead/Lag mode ................................................................................................................................... 10
AIR CONDITIONER UNIT REMOTE COMMUNICATION FEATURES .......................................................................................................... 11
USB COMMUNICATION........................................................................................................................................................................ 11
ETHERNET COMMUNICATION............................................................................................................................................................ 11
USING HOFFMAN PC INTERFACE TOOL.................................................................................................................................................... 12
USB COMMUNICATION MODE............................................................................................................................................................ 12
ETHERNET COMMUNICATION MODE................................................................................................................................................ 13
Instructions for conguring Email or SMS when there is an ACU fault ................................................................................................... 38
Basic Air Conditioning Trouble Shooting Check List - Remote Access Control Version........................................................................ 44
Symptoms and Possible Causes - Remote Access Control Version....................................................................................................... 45
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-us/cooling-warranty-registration

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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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DIGITAL THERMOSTAT CONTROLLER (OPTIONAL)
OVERVIEW
The digital thermostat (controller) is a parametric controller for the complete management of air conditioners.
All settings are pre-programmed at the factory. Cooling/heating setpoint, cooling/heating differential and high/
low temperature setpoint are designed to be adjustable by the operator. All alarms are outputted through the
alarm relay. In addition, if Hoffman network card (Remote Access Control (RAC) Module) is used the parameters
that state above and alarms are accessible remotely through Ethernet connection utilizing SNMP, Modbus TCP,
EtherNet/IP, and Pronet protocol . A USB connection from the network card is also provided with accessibility
to the digital thermostat controller utilizing Modbus RTU and RS-485 serial bus. In addition, the USB connection
is also used to read the network information from the Hoffman network card and temperature setpoints and
alarm from the controller. Note that Hoffman network card (RAC module) is acting as a gateway to the digital
thermostat where temperature setpoints and alarm can be viewed and/or changed remotely.
NOTE: HOFFMAN NETWORK CARD (RAC MODULE) IS OPTIONAL ACCESSORY, THEREFORE,
SOME OF THE AIR CONDITIONERS SHIP WITHOUT THE NETWORK CARD BUT IT IS
UPGRADEABLE UPON REQUEST.
ENERGIZING THE CONTROLLER
The digital controller is wired and programmed at the factory to operate when power is applied to the air
conditioner. In normal condition, the evap fan starts operating after the completion of the self-evaluation which
is less than 30 seconds and fan icon should be illuminated along with the inlet and outlet temperature data (if an
option outlet temperature sensor is installed).
CONTROLLER STATUS INDICATION
The display has numerous symbols to indicate the various controller functions such as cooling, heating, alarming,
evaporator fan, and heating. Indicators (icons) are steady illuminated on screen when active.

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Figure 1: Display
KEYPAD
SYMBOL COLOR ICON INDICATION ICON STATUS
Red Alarm - active when alarm is detected Flashing when alarm is detected
White
Keypad Select – access to passcode , hold
5 sec to turn unit ON/OFF, parameter menu,
parameter setting, write or save to EEPROM,
and hold for 3sec to return to main screen
ON
White Keypad Up – navigate to previous parameter
and increasing parameter variable ON only when reviewing parameters
White Keypad Down – navigate to next parameter
and decreasing parameter variable, all inputs,
unit status. ON
MAIN FIELD
SYMBOL COLOR ICON INDICATION ICON STATUS
°C White When operating temperature in degrees Celsius ON
°F White When operating temperature in degrees of Fahrenheit ON
Main Field Line 1 White Display inlet temperature ON
Main Field Line 2 Orange
1. Display outlet temperature in standalone mode
if let sensor is present
2. Displays device ID for primary-secondary mode
up to 10 units, 1:10 … 10:10 or lead-lag mode up
to 2 units, 1:2… 2:2
ON
ICONS
SYMBOL COLOR ICON INDICATION ICON STATUS
White Compressor Running • Flashing while waiting for compressor to turn ON
• Steady ON while compressor is running
White Evaporator Running ON
White Electric heater ON ON
White Primary and/or lead controller ON
White Freeze control Compressor and Condenser fan OFF while illuminated
White Power ON ON

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DISPLAYING AND CHANGING PROGRAM SETTINGS
TO VIEW OR ACCESS THE SETTINGS
FOLDER MENU ACCESS
3. Press button to display passcode screen, the screen displays PSd on line 1 and 0000 on line 2.
4. Press button to access to passcode , the rst digit of 0000 is ashing and press 3 more times
until the last digit of 0000 ashes.
5. Press arrow two times to change the 0 to 2. Press for access to folder menus.
NOTE: to exit the security level to the main screen wait one minute with no action or Press
arrow until LOG Out message displays, then press button.
PARAMETER SETTINGS
1. Once in the folder menu navigate to the desired setting to be changed using the arrow to scroll
and button to access a menu or parameter.
2. To change a parameter Press button and parameter value will begin to ash.
3. Press / arrow to the desire value.
4. Press button to save the setting and the screen will revert to the parameter mnemonic.
NOTE: IF BUTTON IS NOT PRESSED, THE NEW SETPOINT IS NOT SAVED.
To exit the parameter settings to the main screen wait one minute with no action or Press
arrow few times until ESC displays, then press button to return to UoF screen. From the
UoF screen, press arrow a few times until LOG Out message displays, then press button
to return to the main screen.
Selecting ESC returns to folder menu
Selecting LOG out returns to main screen
TABLE 1: HEAT/COOL OPERATING PARAMETERS
Mnemonic Parameter Description Default Value Range
CSt Cooling setpoint 80 F 72 F to 120 F
Cd (Cd1) Cooling differential 7 F 2 F to 25 F
Cd2 Cooling differential 2 15 F
HSt Heating setpoint 50 F 45 F to 60 F
Hd Heating differential 7 F 2 F to 25 F
(1) Compressor or cooling turns ON at CSt + Cd and OFF at CSt
(2) Heater or heating turns ON at HSt and OFF at HSt + Hd
(3) Cooling differential 2 is only applied to 2-stage compressor and lead-lag application
* Heating mode is only applied to a unit with heater option
TABLE 2: ALARM PARAMETERS
Mnemonic Para Description Default value
Ht High temperature alarm setpoint 125 F
Lt Low temperature alarm setpoint 40 F
dO Door open alarm setting NC
ArOP Alarm relay output NO
(4) The alarm relay output logic is designed to be congurable
REAL-TIME-CLOCK SETTING
This controller is equipped with a real time clock for logging the time and date of alarm activities. There
are ve parameters designating to the minute, hour, year, month of the year, and day of the month as
illustrated in below table.

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Mnemonic Par Description
t01 Unit of hour (0 - 23)
t02 Unit of minute
t03 Unit of year
t04 Unit of month
t05 Unit of day
SEt Save
VIEW ALARMS
Alarms may be viewed when the alerting icon is ashing.
1. On the main screen, press the alerting icon button
2. The screen displays the most recent or newest alarm where the alarm code display on line 1 and the
alerting icon is now in steady
3. Press arrow to view next alarm if there are more than one
4. Press arrow to display ESC, then press button to return to the main screen
VIEW ALARMS IN THE ALARM HISTORY FOLDER
1. Follow instructions above to enter the passcode and open the alarm history folder (AHiF).
2. Press button to access to the alarm history.
3. Press arrow to display the mnemonic alarm on line 1 and time, month, and day display on line
2. For example, low temp alarm (Lt) displays on line 1 and 09:24 and 0706 display on line 2 in
sequence. Note the time, and date recorded in the alarm history is based on the local real-time-clock
if congured after installation.
4. Press arrow to view next alarm. The controller is able to retain up to 25 events
5. Press arrow until the screen displays ESC, then press button to return to the main screen
or if no action for longer than 60 seconds the screen will be automatically revert to the main screen.
NOTE: if no alarms are present then only ESC will be displayed in the folder.
There are seven possible alarms (non-latching) detectable by the controller and are indicated on the
controller display. All alarms are accessible locally. If a Hoffman network card (RAC module) is used,
alarms are also accessible remotely through the Ethernet and USB connection.
Mnemonic
Alarm Description Cause Result Alarm
Relay
Output
dO Door open alarm Enclosure door opens or
not properly close Compressor and evap fan turn OFF in duration of alarm Closed
S1F Inlet temperature
sensor fault Inlet temp probe failed No effect on function, controller
continue operating as normal using
outlet sensor with setpoint of 50 F Closed
S2F Outlet temperature
sensor fault Outlet temp probe failed No effect on function but loss freeze protection Closed
LA Malfunction alarm MALF high pressure
switch opens No effect on function Closed
Ht High temp warning Enclosure air exceeds
high temp alarm setpoint No effect on function Closed
Lt Low temp warning Enclosure air drops below low temp alarm
setpoint No effect on function -
FA Frost alarm Evaporator coil freezes
Compressor and condenser fan turns
OFF for the duration of alarm. Alarm
clears when the outlet temperature
sensor reaches 59 F
Closed

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TO RESET THE ALARMS IN ALARM HISTORY FOLDER
The controller is designed with ability to reset or clear the alarm history.
1. Follow instructions above to enter the passcode and open the reset folder (rStF).
2. The screen displays rSAL on line 2 and nO on line 1, press button the nO is ashing
3. Press arrow to change nO to YeS, then press button reset the alarms. The screen ashes
once and returns to rSAL with nO one line 2
4. Press arrow to navigate to ESC, then press to returns to rStF screen.
5. Press arrow to navigate to LOG Out, then press button to return to the main screen or if no
action for longer than 60 seconds the screen will be automatically reverted to the main screen.
TO RESET PARAMETERS TO FACTORY DEFAULT
This option is ONLY applied if the operator wants to reset all control parameters back to factory default.
1. Follow instructions above to enter the passcode and open the reset folder (rStF).
2. The screen displays rSAL, press arrow to navigate to rSPA and then press button
3. The screen displays rSPA one line 1 and the word nO on line 2 in steady state, press button and
then the word nO is ashing and ready to change
4. Press arrow to change nO to YES. Press button the screen displays PSd with 0000 on line 2
5. Press button to enter to passcode. Press button few times until the last digit of 0000
ashing
6. Press arrow to change 0 to 2, press button to authorize the reset of the parameters
7. The screen returns to rSPA screen in steady state.
8. Press arrow to navigate to ESC, then press to returns to rStF screen.
9. Press arrow to navigate to LOG Out, then press button to return to the main screen or if no
action for longer than 60 seconds the screen will be automatically reverted to the main screen.
DISPLAYING TEMPERATURE DATA ON SCREEN
There are two temperature probes in the air conditioner where one is reading the enclosure air temperature
incoming to the air conditioner and other is reading the cooled air leaving the air conditioner and entering the
enclosure. Both temperature data are displayed on the screen where line 1 is the reading of the inlet temperature
and line 2 is the reading of the outlet temperature.
COMPRESSOR RESTART TIME DELAY
A factory set 5 minute (300 seconds) 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 compressor icon on the display indicating that the unit is in a compressor restart delay
mode while calling for cooling or waiting for compressor to turn ON.
ALARM OUTPUT CONTACT
The digital controller has a normally open dry contact alarm output with a resistive load rating of 250VAC @ 5
amps max. The two yellow 18 AWG wires located at the back of the air conditioner provide a connection to this
output. Note: Do not apply power to this normally open dry contact (two yellow 18 AWG wire). This alarm relay
output is congurable and provides user with the ability to change the conguration to support their external
device. Parameter C21 controls the alarm relay output logic and can be accessed through security code “0022” in
the PArF folder.
Para Description Conguration
C21 Alarm relay output logic 0 = normally open (NO) – factory default
1 = normally closed (NC)

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ALARM INPUT CONNECTION
The digital controller can accept a dry contact/switch input via the two 18 AWG white wires located at the back
of the air conditioner. This input is associated with the controller display alarm mnemonic dO (door open). To use
this feature, remove the splice connector, and connect the two white wires to customer supplied enclosure door
switch in its place. Note: Do NOT apply power to this dry contact input.
PRIMARY-SECONDARY (PS) MODE
Note: During normal operation, in both the primary-secondary (PS) and lead-lag (LL) operating
modes, line 2 displays the device ID, not the outlet temperature. The outlet temperature can be
viewed on line 1 by pressing arrow.
Primary-secondary (PS) mode shares the same hardware and source code as standalone mode, but offers more
functionality and features. The controller ships from the factory in Standalone Mode. PS mode is congured
manually in the eld after the installation. This option allows the user to operate the air conditioner in a group
network with up to 10 units. To support PS mode, three parameters, H01, H02, and H03 need to be congured.
H01 species the operating mode, H02 species the device ID, and H03 species the total number of the units in
the group network.
Before conguring to operate in PS mode, the user should understand the functionality of the PS mode.
1. In the PS mode, all units operate off the cooling/heating setpoint and differential of the primary unit.
The system prevents setpoint changes from secondary units.
2. The primary unit monitors the enclosure temperatures of all the units and manages the ON/OFF
status of cooling and heating based on the the unit reporting the highest temperature.
3. When cooling is initiated the primary unit energizes rst. Secondary units are energized sequentially
at 10 second intervals. When heating is initiated all units turn on heat together. When cooling or
heating is satised all units turn off together.
4. If the number of units communicating on the network doesn’t match the value in H03 then
the primary unit will display alarm LC, and the secondary units will display alarm LC1 until the
communication re-established.
5. Any unit that loses communication with the primary unit will enter standalone mode and continue
operating based on its own temperature probe until communication is re-established.
6. All temperature setpoints and alarms can be viewed remotely if one of the ACUs is equiped with
Hoffman network card (RAC module).
7. Best recommendation is to congure the ACU that has Hoffman network card to be the primary one
CONNECTING UNITS TOGETHER IN PRIMARY/SECONDARY MODE
Figure 2: Primary-secondary network connectivity

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To congure the controller from single mode to PS mode, simply follow below procedures
1. Before proceeding the PS mode conguration for each controller, make sure that the
communication cable is connected from one ACU to another using a shielded cable with the shield
grounded.
2. Press button to display passcode screen, the screen displays PSd on line 1 and 0000 on line 2.
3. Press button to access to passcode, the rst digit of 0000 is ashing and press 2 more times
until the third digit 0000 ashes. Press arrow two times to change 0to 2, then press button
to move to the last digit 0020
4. Press arrow two times to change the 0 to 2.
5. Press button to access to folder menu and then, the screen displays ALrF
6. Press arrow to navigate to PArF, then press button to access to parameter menu
7. The screen displays C, press arrow to navigate to parameter Hand then, press button to
access to parameter Hmenu
Parameter Description Available Range PS Settings Default
H01 Mode SA (stand alone) PS (primary-secondary)
LL (lead-lag) PS (primary-secondary) SA
H02 Device ID 1 up to 10 1 up to H03 1
H03 Total number of the units in the group network 1 up to 10 2 up to 10 1
8. Set parameter H01 to PS (primary-secondary).
Note that after H01 = PS, the snowflake icon is illuminated and line 2 changes its display
information from outlet temperature to device ID, for example, line 2 displays 01:02 where 01
indicates controller #1 and 02 indicates the total number of the controllers in a group network.
Keep in mind that the snowflake icon only illuminates on primary controller.
9. Set parameter H02 (device ID) to 1 to 10. This device ID will be different for each controller that is
connected. The controller set to 1 will be the primary controller. Use numbers sequentially and don’t
skip using a number.
10. Set parameter H03 (total number of controllers connected) to 1 to 10.
LEAD-LAG (LL) MODE
Lead-lag (LL) mode shares the same hardware and source code as standalone mode, but offers more
functionality and features. The controller ships from the factory in Standalone Mode. LL mode is congured
manually in the eld after the installation. This option allows the user to operate two air conditioners in a staged
cooling conguration. The controller will alternate which air conditioner is the rst stage. To support LL mode,
four parameters, H01, H02, H03, and H14 need to be congured. H01 species the operating mode, H02 species
the device ID, H03 species the total number of the units in the group network, and H14 is the LL strategy
selection.
The two controllers is communicated through eldbus interface as illustrated in Figure 3. In the lead-lag mode the
controller supports
• Lead-lag staged cooling uses two cooling differential temperature settings Cd1 and Cd2. The lead air conditioner
will begin cooling at SP+Cd1 and the lag air conditioner will begin cooling at SP+Cd1+Cd2. Cooling will stop when
the temperature drops to SP.
• The two air conditioners will take turns being the lead and lag. Alternating can be done in time based or every
cooling cycle and is congured with H14.
CONNECTING UNITS TOGETHER IN LEAD/LAG MODE
Figure 3: Lead-Lag Network Conectivity

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To congure the controller from single mode to LL mode, simply follow below procedures. Perform this
conguration for both air conditioners.
1. Before proceeding the LL mode conguration for each controller, make sure that the communication
cable is connected from one ACU to another using a shielded cable with the shield grounded.
2. Press button to display passcode screen, the screen displays PSd on line 1 and 0000 on line 2.
3. Press button to access to passcode, the rst digit of 0000 is ashing and press 2 more times
until the third digit 0000 ashes. Press arrow two times to change 0 to 2, then press button
to move to the last digit 0020
4. Press arrow two times to change the 0 to 2.
5. Press button to access to folder menu and then, the screen displays ALrF
6. Press arrow to navigate to PArF, then press button to access to parameter menu
7. The screen displays C, press arrow to navigate to parameter H and then, press button to
access to parameter H menu
Parameter Description Available Range LL Settings Default
H01 Mode SA (stand alone) PS (primary-secondary)
LL (lead-lag) LL (lead-lag) SA
H02 Device ID 1 up to 10 1 or 2 1
H03 Total number of the units in the
group network 1 up to 10 2 1
H14 LL strategy selection 0-250 0 (Alternate each cycle)
1-250 (Alternate hours) 0
8. Set parameter H01 to LL (lead-lag).
9. Set parameter H02 (device ID) to 1 for one unit and 2 for the other unit.
10. Set parameter H03 (total number of controllers connected) to 2.
11. Set parameter H14 (LL strategy selection) to 0 to 250. This is the run time in hours before ACU1
and ACU2 will alternate being the lead unit. When set to zero ACU1 and ACU2 will automatically
alternate every cycle
AIR CONDITIONER UNIT REMOTE COMMUNICATION FEATURES
Air conditioners that include the optional Hoffman network card (RAC module) have remote communication
capabilities utilizing SNMP, Modbus TCP, EtherNet/IP, Pronet Protocol via Ethernet connection, and Modbus
RTU protocol via USB connection. nVent provides Windows interface application software that is available to
download free from nVent support link https://go.nvent.com/remote-access-control-support-center.
The Windows interface application software supports both Ethernet and USB communication.
USB COMMUNICATION
This communication mode allows direct connection from a laptop (or PC) to the air conditioning unit
using a Mini-b USB cable. As stated above, Modbus RTU is used to communicate between the two
devices via USB connection.
ETHERNET COMMUNICATION
This communication mode allows remote connection to the air conditioning unit utilizing SNMP, Modbus
TCP, EtherNet/IP, and Pronet protocol. Customers that use their own software can download an MIB le
for SNMP, EDS or EtherNet/IP Object le for EtherNet/IP, Coil Register le for Modbus TCP, and Data Point
for Pronet.

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Note: the Ethernet card (RAC module) has a default IP Address of 192.168.1.2
Both Ethernet and USB communication allow the ability to
• Read ACU inlet and outlet air temperature
• Read and change cooling and cooling differential setpoints
• Read and change heating and heating differential setpoints
• Read and change the high and low temperature alarm settings
• Read and change the Gateway IP address, Device IP address, Subnet MASK, Trap IP address, and community string
• Read and change unit identication
• Read and change the state of IP address from static to dynamic or vice versa
• Read and change the air temperature unit of measure (from F to C or vice versa)
• Read current alarm status
• Evaporator fan control setting
• Read and change the control of door open switch
SOFTWARE AND CONFIGURATION FILE DOWNLOADS
As stated above, the PC interface tool, MIB le, EDS and EtherNet_IP Object le, Coil Register le, and
Data Point le can be downloaded from remote access control support center link, https://go.nvent.com/
remote-access-control-support-center.
USING HOFFMAN PC INTERFACE TOOL
conditioners both domestically and globally at one central location at user’s own pace, so long as all air
conditioners are congured in the same subnet in the network. Hoffman PC Interface Tool also supports text
message and email alerting to a service technician when an alarm occurs. In addition, the tool also provides data
logging capability for data analysis.
USB COMMUNICATION MODE
NOTE: Before connecting the unit to the PC, make note of Comm Ports present. After the unit
is connected to the PC, a new Comm Port will be added to the list. Recommend using the new
Comm Port.
• In the Hoffman A.C. Monitor main screen, click on Tools and uncheck Use Ethernet
• Click on Tools menu again, the Comm Port menu is now enabled
• Put the mouser icon to the Comm Port and to the right there is small box with dropdown arrow
• Click on the dropdown arrow next to the small box to view the list of the Comm Port
• Write down the list of the Comm Port
• Connect the Mini-b USB cable from the PC or laptop to the A/C unit
• Click on Tools menu and point the mouser icon to the Comm Port, the small box with dropdown arrow presents to
the right
• Click on the dropdown arrow and select the newest or higher number of the Comm Port
TO VIEW THE CONTROLLER DATA INFORMATION FROM THE A/C UNIT
• In the Hoffman A.C. Monitor main screen, select Single ACU Monitor tab
• Click on Enable Comm button, then the screen will be displayed the enclosure air temperature and other temperature
settings information include the unit of measure
• The Enable Comm text on the button now changes to Disable Comm
• To stop the communication, click on the Disable Comm button and it will change to Enable Comm
TO CHANGE THE TEMPERATURE SETTINGS TO THE CONTROLLER
• In the Hoffman A.C. Monitor main screen, select Single ACU Settings tab
• Note that the Change Settings button is disable and all settings are grayed out. Click on Read Settings button, all
settings are now displayed on screen and the Change Settings button is now enable
• To change any of the temperature setting, Unit ID, or Station Name, simply click up/down arrow on right of the box or
highlight the current value and type the new value in the box
• Check the box on the left, then click on Change Setting buttons to save the new setpoint
• Click on Read Settings again to verify the new setpoint
• Select Single ACU Monitor tab and click on Enable Comm to read the new temperature settings from the controller
• Each of the setpoint should match the new variables that just entered from the Single ACU Settings tab
TO VIEW AND CHANGE THE ETHERNET CARD (RAC) INFORMATION
• In the Hoffman A.C. Monitor main screen, select Single ACU Ethernet Info tab and notice that the Reprogram ACU
button is disabled
• Click on Read Ethernet Info button, the Ethernet information will be displayed and the Reprogram ACU button is
enable
• To change the Ethernet conguration such as Device IP Address, Gateway IP, and Trap IP, make sure to change the

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Community string to private from public. Note that case is very sensitive. The wording must be lower case only.
• Enter the new network conguration to Device IP address, Gateway IP, and Trap IP, then click on Reprogram ACU
button to write to the network card
• In order to be recognized the new networking congurations in local network, cycle power to the A/C unit is required
TO CHANGE THE STATIC NETWORK TO DYNAMIC NETWORK MODE
• In the Single ACU Ethernet Info tab screen, click on Read Ethernet Info button to read the network card information.
Note that the Reprogram ACU button is now enable
• Check the box next to the Use DHCP Server on the upper left corner of the screen
• Click on Reprogram ACU button. Now the network is switched to dynamic from static mode
• To change the dynamic mode to static mode, in the Single ACU Ethernet Info tab window click on Read Ethernet
Info button
• Uncheck the box next to the Use DHCP Server on the upper left corner of the screen
• Click on Reprogram ACU button to switch to static mode
ETHERNET COMMUNICATION MODE
• In the Hoffman A.C. Monitor screen, click on Tools on the main menu
• In the dropdown window, check the Use Ethernet and notice that Comm Port is now disabled
• Select Single ACU Monitor tab, in the window click on the Device IP box and type the IP address that need to
communicate to the network card
• Click on the Community box and then type the word private
Note that there are two community strings where one is for read ONLY and one is for read/
write. The word “public” allows to read ONLY and “private” allows to read and write
• Click on Enable Comm button to communicate to the network card and read the temperature information from the
controller
• Now the temperature settings information in the controller present on the screen
• To view and change the temperature setpoints, Ethernet card congurations, static and dynamic networking mode,
simply follow the same procedures that dene for the USB communication mode above
TO MONITOR MULTIPLE A/C UNITS IN THE NETWORK
With the Ethernet networking mode, it provides user with the ability to manage and monitor hundreds
of the A/C units from distance domestically and globally at one central location as long as all A/C units
congure in the same subnet in the network. Refer to remote access control (RAC) Instruction Manual for
conguring multiple units and with text message and email capability in Hoffman A.C. Monitor software.
The remote access control Instruction Manual, P/N: 89091002 can be downloaded from nVent support
center link, https://go.nvent.com/remote-access-control-support-center.
ALARM LOG ACCESSIBLE WITH SUPPORT PROTOCOL
• Using custom software with below supporting le gives the user ability to view a log of the last 25 alarms
• MIB le for SNMP protocol
• Register and Coil le for Modbus TCP protocol
• EDS and/or EtherNet_IP Objects le for EtherNet/IP protocol
• Pronet Data Point le for Pronet protocol

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REMOTE ACCESS CONTROL PIN-OUT
FUNCTION NAME PIN# WIRE#
J6
RETURN C 1 BLK75
ENCL MI NO1 2BLK77
COOL NO2 3ORG78
NA N03 4 -
HEAT NO4 5BRN76
J7 RETURN C 2 YEL39
ALAR RELAY OUTPUT NO5 3YEL38
J1 GROUND G0 1BLK40
POWER (24VAC) G 2 WHT41
J2
NA 5V 1 -
NA S3 2 -
INLET TEMP PROBE S1 3RED
NA Y1 4 -
DOOR OPEN SWITCH ID1 5WHT63
GROUND O 6 WHT
RESERVED S5 7 -
OUTLET TEMP PROBE S2 8RED45
NA Y2 9 -
MAL-FUNCTION ALARM ID2 10 BLU88
J3
RESERVED ID3 1 -
UNIT REMOTE ON/OFF ID5 2 -
NA +V 3 -
RESERVED S6 4 -
NA VL 5 -
RESERVED ID4 6 -
GROUND O 7 -
RESERVED S4 8 -
J4
DATA (-) - 1 BLK
DATA (+) + 2 RED
GROUND O 3 WHT
J5
DATA (-) - 1 -
DATA (+) - 2 -
GROUND O 3 -

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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 Primary-Secondary ACU configurations, with one Primary ACU and up to three secondary ACUs.
• Support for configuring the polarity of the door open/smoke detected switch with Control firmware 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 15 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 15 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.
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 17.

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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.
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 18)
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.

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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.
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 19) 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guing the Hoffman A.C. Monitorr
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.