nvent X2302 Series User manual

© 2022 nVent 89215748
Rev. C P/N 89215748
EXTREME AC
Air Conditioner
X2302 Model
INSTRUCTION MANUAL

© 2022 nVent 89215748
- 2 -
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
HOFFMAN if further information is required.
WARRANTY AND RETURN POLICY
https://hoffman.nvent.com/en/hoffman/warranty-information
TABLE OF CONTENTS
Warranty and Return Policy............................................................................................................................................................. 2
RECEIVING THE AIR CONDITIONER............................................................................................................................................... 3
HANDLING AND TESTING THE AIR CONDITIONER...................................................................................................................... 3
INSTALLATION INSTRUCTIONS..................................................................................................................................................... 4
DIMENSION DRAWING................................................................................................................................................................................... 4
Mounting Cutout Dimensions........................................................................................................................................................................ 5
Wire Diagram................................................................................................................................................................................................... 6
Schematics ..................................................................................................................................................................................................... 7
TECHNICAL INFORMATION............................................................................................................................................................ 8
DESIGN DATA.................................................................................................................................................................................................. 8
Washdown Note ............................................................................................................................................................................................. 8
Component List .............................................................................................................................................................................................. 8
Smart Controller............................................................................................................................................................................... 9
Principles of Operation.................................................................................................................................................................... 9
Overview.......................................................................................................................................................................................................... 9
ENERGIZING THE CONTROLLER .................................................................................................................................................................. 9
CONTROL STATUS INDICATION.................................................................................................................................................................... 9
DISPLAYING AND CHANGING PROGRAM Settings .................................................................................................................................. 12
To view or access the settings............................................................................................................................................................ 12
Heat/Cool Operating Parameters................................................................................................................................................................ 12
Alarm Parameters......................................................................................................................................................................................... 12
DISPLAYING TEMPERATURE DATA ON SCREEN ...................................................................................................................................... 14
COMPRESSOR RESTART TIME DELAY....................................................................................................................................................... 14
ALARM OUTPUT CONTACT......................................................................................................................................................................... 14
ALARM INPUT CONNECTION...................................................................................................................................................................... 14
PRIMARY-SECONDARY (PS) MODE............................................................................................................................................................ 15
Connecting units together in Primary/Secondary mode .......................................................................................................................... 15
Connecting units together in Lead/Lag mode ........................................................................................................................................... 16
AIR CONDITIONER UNIT REMOTE COMMUNICATION FEATURES .......................................................................................................... 17
USB COMMUNICATION........................................................................................................................................................................ 17
ETHERNET COMMUNICATION............................................................................................................................................................ 17
USING HOFFMAN PC INTERFACE TOOL.................................................................................................................................................... 18
USB COMMUNICATION MODE............................................................................................................................................................ 18
USB COMMUNICATION MODE............................................................................................................................................................ 19
ETHERNET COMMUNICATION MODE................................................................................................................................................ 20
REMOTE ACCESS CONTROL PIN-OUT ....................................................................................................................................................... 21
MAINTENANCE.............................................................................................................................................................................. 22
Compressor................................................................................................................................................................................................... 22
Inlet Air Filter ................................................................................................................................................................................................. 22
How To Remove, Clean or Install a New Inlet Air Filter ............................................................................................................................. 22
Condenser and Evaporator Air Movers....................................................................................................................................................... 22
Refrigerant Loss............................................................................................................................................................................................ 23
Maintenance / Inspection Recommendations .......................................................................................................................................... 23
TROUBLE SHOOTING ....................................................................................................................................................................24
Basic Air Conditioning Trouble Shooting Check List................................................................................................................................. 24
Symptoms and Possible Causes: ............................................................................................................................................................... 25
F-GAS INFORMATION....................................................................................................................................................................25

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RECEIVING THE AIR CONDITIONER
Inspect the air conditioner. Check for concealed damage that may have occurred during shipment. Look for dents,
scratches, loose assemblies, evidence of oil, etc. Damage evident upon receipt should be noted on the freight bill.
Damage should be brought to the attention of the delivering carrier -- NOT to nVent Equipment Protection -- within
15 days of delivery. Save the carton and packing material and request an inspection. Then le a claim with the
delivering carrier.
nVent Equipment Protection cannot accept responsibility for freight damages; however, we will assist you in any
way possible.
HANDLING AND TESTING THE AIR CONDITIONER
If the air conditioner has been in a horizontal position, be certain it is placed in an upright, vertical or mounting
position for a minimum of ve (5) minutes before operating.
Do not attempt to operate the air conditioner while it is horizontal
or on its side, back or front. The refrigeration compressor is lled
with lubricating oil. This will cause permanent damage to the air
conditioner and also voids the warranty.
CAUTION
TEST FOR FUNCTIONALITY BEFORE MOUNTING THE AIR CONDITIONER TO THE ENCLOSURE.
Refer to the nameplate for proper electrical current requirements, and then connect the power cord to a properly
grounded power supply. Minimum circuit ampacity should be at least 125% of the amperage shown in the
design data section for the appropriate model. No other equipment should be connected to this circuit to prevent
overloading.
Operate the air conditioner for ve (5) to ten (10) minutes. No excessive noise or vibration should be evident
during this run period. The condenser blower (ambient air), the evaporator blower (enclosure air), and the
compressor should be running.
Condenser air temperatures should be warmer than normal room temperatures within a few minutes.
The compressor is provided with automatic reset thermal overload protection. This thermo-switch is located
and mounted inside the plastic enclosure clipped to the compressor. The switch operates when the compressor
overheats due to clogged or dirty inlet air lter or if ambient air temperatures exceed nameplate rating or if
enclosure dissipated heat loads exceed the rated capacity of the air conditioner. The thermal overload switch
will actuate and stop compressor operation. The blowers will continue to operate and the compressor will restart
after it has cooled to within the thermal overload cut-in temperature setting.

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INSTALLATION INSTRUCTIONS
1. Inspect air conditioner and verify functionality before mounting the air conditioner, see HANDLING
AND TESTING THE AIR CONDITIONER on page 3.
2. Using the cutout dimensions shown in this manual, prepare the air conditioner opening, and
mounting bolt hole pattern for the enclosure. See Mounting Cutout Dimensions on page 5 for
proper location.
3. Using the gasket kit provided, install gaskets to the enclosure using the cutout and bolt hole
pattern as a guide.
4. Mount air conditioner on enclosure using mounting bolts and washers provided to secure unit to
enclosure. Torque bolts to 22.5in-lb (2.5Nm). Allow unit to remain upright for a minimum of ve (5)
minutes before starting. Caution! Air conditioner must be in upright position during operation.
5. To avoid cross-threading mounting inserts, start bolts by hand before tightening with a wrench or
ratchet driver.
6. Refer to the top of the nameplate for electrical requirements. Connect power from a properly
grounded power supply. Use of an extension cord is not recommended. Electrical circuit should be
fused with slow blow or HACR circuit breaker.
7. When the unit is equipped with an automatic temperature controller, the controller is preset at the
factory for your convenience and should not require adjustment.
DIMENSION DRAWING
10.23
260
22.32
567
13.64
346
WARM
AIR OUT
CLEANABLE, REUSABLE
ALUMINUM INLET FILTER
4.49
114
5.08
129
3X
.57
15
5X
.54
14
1.59
40
6.50
165
7.56
192
1.04
27
6.00
152
POWER IN
TERMINAL BLOCK (POWER
CONNECTIONS BEHIND
REMOVEABLE COVER)
12X 1/4-20
MOUNTING HOLES
3.78
96
1.26
32
11.41
290
.48
12
CONDENSATE
DRAIN
AMBIENT
AIR IN
ENCLOSURE
AIR IN
COOL AIR
OUT
89215771

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MOUNTING CUTOUT DIMENSIONS
22.22
564
3X
.48
12
.95
24
3X
5.00
127
3X
10.63
270
3X
16.25
413
3X
21.25
540
3X
.43
11
3X
4.58
116
3X
9.15
232
12X
.31
8
20.32
516
8.40
213
.80
20
CUTOUT DIMENSIONS
89215771
MOUNTING GASKET
ADHERES TO ENCLOSURE

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WIRE DIAGRAM
89206067 REV.C

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SCHEMATICS
89206866 REV.B
J3

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TECHNICAL INFORMATION
DESIGN DATA
Model Voltage Hz Phase Full Load Cooling
Amps
Full Load
Heating
Amps
BTU/Hr
@ Max
Ambient
Temperature
Max Amb
Temperature
°F/°C
Shipping
Weight
lb./kg
X230216GXXX 110/115 50/60 16.8/6.3 3.3/3.5 2100/2300 131/55 60/27
X230226GXXX 220/230 50/60 12.8/2.9 1.7/1.8 1760/1890 131/55 60/27
-XXX will be replaced with a three-digit number designating all desired options. Consult the factory for specic model numbers.
WASHDOWN NOTE
Testing has conrmed that with the cover in place the X2302 Air Conditioner will successfully withstand a clean
water washdown procedure while the unit is energized. If the washdown procedure is performed with the cover
removed the unit must rst be de-energized, and must be allowed to dry completely before the cover is reinstalled
and power is reapplied.
COMPONENT LIST
Part Description Part Number
115V 230V
Compressor 89109872 89109873
Capacitor, Compressor 89107709 89106525
Thermal Overload, Compressor 89109877 89109878
Impeller, Condenser 89206390 89206391
Capacitor, Condenser Impeller 52-6032-15 52-6032-14
Fan, Evaporator 12-1012-01 12-1012-02
Smart Controller 89202719 89202719
Control Transformer 10-1006-94 10-1006-93
MALF Switch 89096948 89096948
HPC Switch 89083016 89083016
Coil, Condenser, Coated 20-1020-01 20-1020-01
Coil, Evaporator 89204519 89204519
Filter/Dryer 52-6028-03 52-6028-03
Filter, Air, Reusable 89203781 89203781
Optional 350 W Heater 89206006 89206007
Air Conditioner Mounting Gasket 89202697 89202697

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SMART CONTROLLER
• All Model X2302X6 Air Conditioners are equipped with a Smart Controller.
• A Remote Access Control (RAC) optional accessory is available. The RAC can be ordered along with the X2302X6,
or if desired, it can be ordered separately as an upgrade at some later date. The RAC is packaged and shipped
separately from the air conditioner since it cannot t inside the unit. The RAC is eld installable.
PRINCIPLES OF OPERATION
• If electrical power to the air conditioner is interrupted and reapplied immediately (within 3 to 5 seconds), the
compressor may not restart due to the high back pressure of the compressor. It takes a minimum of one (1) minute
after shut-down for the compressor suction and discharge pressures to equalize in order for the air conditioner to
restart.
• Operating the air conditioner below the minimum ambient temperature or above the maximum ambient
temperatures indicated on the nameplate voids all warranties.
• It is recommended that the warranty section of this manual be read in order to familiarize yourself with parameters
of restricted operation.
• The moisture that the enclosure air can contain is limited. If moisture ows from the drain tube continuously this can
only mean that ambient air is entering the enclosure. Be aware that frequent opening of the enclosure’s door admits
humid air which the air conditioner must then dehumidify.
OVERVIEW
The smart 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. See
AIR CONDITIONER UNIT REMOTE COMMUNICATION FEATURES on page 17 for remote input and output
capabilities.
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).
CONTROL 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.
Figure 1
Display

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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 outlet 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
TO ACCESS FOLDER MENUS:
1. Press button to display passcode screen, the screen displays PSd on line 1 and 0000 on line 2.
2. 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.
3. 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.
TO CHANGE A PARAMETER SETTING
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 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.
HEAT/COOL OPERATING PARAMETERS
Mnemonic
Parameter Description Default Value Range
CSt1Cooling setpoint 80 F
26.7 C 72 F to 120 F 22.2 to 48.9 C
Cd (Cd1)1Cooling differential 7 F
3.9 C 2 F to 25 F 1.1 to 13.9 C
Cd24Cooling differential 2 15 F
8.3 C
HSt2 3 Heating setpoint 50 F
10.0 C 45 F to 60 F 25.0 to 33.3 C
Hd3Heating differential 7 F
3.9 C 2 F to 25 F 1.1 to 13.9 C
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 Heating mode is only applied to a unit with heater option
4 Cooling differential 2 is only applied to 2-stage compressor and lead-lag application
ALARM PARAMETERS
Mnemonic Para Description Default value
Ht High temperature alarm setpoint 125 F
51.7 C
Lt Low temperature alarm setpoint 40 F
4.4 C
dO Door open alarm setting NC
ArOP Alarm relay output NO
NOTES: (4) The alarm relay output logic is designed to be congurable

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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 THE 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 that 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 (10 C)
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 (15 C)
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 3 minute (180 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)
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.

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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 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 equipped 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
Primary - Device ID 1 Secondary - Device ID 2 Secondary - Device ID 3 Secondary - Device ID 10
Figure 2
Primary-secondary network connectivity

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TO CONFIGURE 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) SAPS (primary-secondary)
LL (lead-lag)
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.
CONNECTING UNITS TOGETHER IN LEAD/LAG MODE
Lead - Device ID 1 Lag - Device ID 2
Figure 3
Lead-Lag network connectivity

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TO CONFIGURE THE CONTROLLER FROM SINGLE MODE TO LL MODE, SIMPLY FOLLOW BELOW
PROCEDURES. PERFORM THIS CONFIGURATION 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 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 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.
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

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• 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
Hoffman PC Interface Tool gives the user the ability to communicate with Hoffman air conditioning unit as to
read and write air temperature data, high and low temperature alarm setting, active alarms, and other information
from the controller remotely using either Ethernet or USB connection. With Hoffman PC Interface Tool a user has
the ability to remotely manage and monitor hundreds of Hoffman air 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: 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
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.

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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: 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.
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
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.

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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: 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: 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 the ability to view a log of the last 25 alarms
LJMIB le for SNMP protocol
LJRegister and Coil le for Modbus TCP protocol
LJEDS and/or EtherNet_IP Objects le for EtherNet/IP protocol
LJPronet Data Point le for Pronet protocol