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