18
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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 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
0
000
is flashing and press
2
more times until the third digit
00
0
0
flashes. Press
arrow two times to change
0
to
2
, then press
button to move to the last digit
002
0
.
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
H
01
Mode
SA (stand alone)
PS (primary-secondary)
LL (lead-lag)
LL (lead-lag)
SA
H
02
Device ID
1
up to
10
1
or
2
1
H
03
Total number of the units
in the group network
1
up to
10
2
1
H
14
LL strategy selection
0
-
250
0
(Alternate each cycle)
1
-
250
(Alternate hours)
0
8. Set parameter
H
01
to
LL
(lead-lag).
9. Set parameter
H
02
(device ID) to
1
for one unit and
2
for the other unit.
10. Set parameter
H
03
(total number of controllers connected) to
2
.
11. Set parameter H
14
(LL strategy selection) to
0
to
250
. This is the run time in hours before ACU
1
and ACU
2
will alternate being the lead
unit. When set to zero ACU
1
and ACU
2
will automatically alternate every cycle.
Air conditioner unit remote communication features
Air conditioners that include the optional nVent 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
• 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
