JOHNSON CONTROLS
39
FORM 450.50-N1
ISSUE DATE: 08/19/2019
4
USING THE SC-AP FOR TROUBLESHOOTING
The SC-AP is a device that interfaces with Johnson
Controls Connected Chillers service. This device can
also be used to troubleshoot connectivity issues.
If an SC-AP is installed as part of a Connected Servic-
es installation, or if an SC-AP is available otherwise,
connecting it to the SC-EQ allows the technician to
view the port activity to aid in communication prob-
lem diagnosis. It is also required to manually set the
Chiller Model on older YorkTalk2 chillers that do not
auto-discover. Refer to page 34 for instructions on how
to manually set the chiller model. For more detailed
information on the SC-AP refer to SC-AP Installation
Instructions (Lit 24-10737-75) and SC-AP Quick Start
(Lit 24-10737-75).
The first screen displayed on the SC-AP after login
is the Device List screen, as shown in Figure 46 on
page 39). The example shows two devices, the SC-
AP, and the SC-EQ, as well as their MAC address. The
SC-AP is always MAC address three. In the example
below, the SC-EQ has MAC address four. The Device
List can be used to help troubleshoot issues where the
BAS is not connecting to the SC-EQ.
Selecting the SC-EQ Data tab displays the data for the
SC-EQ. Four of the parameters in the SC-EQ Data tab
display the three communication port settings and the
Online/Offline status of the ports. Refer to Figure 47
on page 39.
The SC-EQ Port Status shows that the Equipment Port
is communicating using YorkTalk 3 and the BAS is
Modbus. The CS port is always BACnet MSTP. If ei-
ther the BAS or the EQ port are not active for a short
period of time, the status is displayed as "Offline." If
the communications is not present for a few minutes,
the status is displayed as "No Protocol." The SC-EQ
continually tries to connect to the absent ports.
FIGURE 46 - SC-AP DEVICE LIST
LD19990
LD29237
FIGURE 47 - SC-EQ PORT STATUS AND LOCK IN
SECTION 4 - SC-AP GATEWAY
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