Air Conditioner Unit Remote Communication Features; Usb Communication; Ethernet Communication - nvent SPECTRACOOL G52 Instruction Manual

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 configuration 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 first digit of 0000 is flashing and press 2 more times
until the third digit 0000 flashes. Press
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
7. The screen displays C, press
access to parameter H menu.
Parameter
H01
H02
H03
H14
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, Profinet 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 Profinet protocol. Customers that use their own software can download an MIB file
for SNMP, EDS or EtherNet/IP Object file for EtherNet/IP, Coil Register file for Modbus TCP, and Data Point
for Profinet.
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 identification
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arrow to navigate to parameter H and then, press
Description
Mode
Device ID
Total number of the units
in the group network
LL strategy selection
© 2022 nVent
arrow two times to change 0 to 2, then press
button to access to parameter menu.
Available Range
SA (stand alone)
PS (primary-secondary)
LL (lead-lag)
1 up to 10
1 up to 10
0-250
button to
LL Settings
LL (lead-lag)
1 or 2
2
0 (Alternate each cycle)
1-250 (Alternate hours)
button
Default
SA
1
1
0
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