92
Universal Protocol Converter (UPC)
See Fig. 45 and Table 36.
The UPC board is required to convert CCN into Modbus proto-
col. It contains the operating software that runs the ERV logi-
cally. The UPC is connected to the ComfortLink controller
LEN bus on the rooftop unit.
The DIP switches should be set as follows: 1=off, 2=off, 3=on,
4=on, 5=off, 6=off, 7=on, and 8=off. The address rotary
switches should be set to 01 (10’s=0 and 1’s=1). Do not
change these settings.
USER INTERFACE
All ERV set point adjustment, service tests, and monitoring are
accomplished through the ComfortLink controller scrolling
marquee interface. See the ComfortLink Controls, Start-Up,
Operation and Troubleshooting Instructions for further details
on ComfortLink controller operation. The ERV EXCB board
has a LCD screen that can be used to help troubleshoot com-
munication problems. The following are examples of the text
that can be seen on the EXCB’s LCD screen.
LCD Texts
Initialize_LEN Communication
This will occur when the ERV is turned on from a power reset.
Communication Connected
This will be displayed when correct communication is estab-
lished between the RTU and ERV and within the ERV.
Comm Failure1 UPC_to_LEN_Fail
This occurs if there is a communication problem between the
UPC and ComfortLink MBB.
Comm Failure2 UPC_to_EXCB_Fail
This will occur if there is a communication problem between
the UPC and the EXCB.
Warning UPC TestMODE_Enabled
This will occur if the UPC was left in a factory Test mode a
BACview
1
Handheld is needed to pull the ERV out of this
mode back to normal running mode.
Fig. 45 — Universal Protocol Converter (UPC)
1. BACView is a registered trademark of Automated Logic Corporation.
Table 36 — UPC Input/Output Connections
TERMINAL NAME DESCRIPTION Input/Output TYPE OF Input/Output
CONNECTION PIN
NUMBER
24VAC Supply power to UPC Input 24VAC 1 - 2
Port 2 UPC Modbus both Communication 1 - 2
Port 1a UPC LEN both Communication 1 - 3
Port 1b Not used N/A N/A N/A
Rnet
BACview User Interface or
Download Connection
both Communication 1 - 4
Local Access both Communication 1 - 5
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