Johnson Controls York Smart Equipment SC-EQ - Updating Firmware and Software

JOHNSON CONTROLS
35
SECTION 3 - TROUBLESHOOTING
FORM 450.50-N1
ISSUE DATE: 08/19/2019
3
communications are occurring on the BAS bus.
If the voltage reading is steady but out of the
(0.38 VDC to 0.47 VDC) voltage range then the
issue could be improper EOL terminations, issues
with wiring or some other issue. If the BAS trunk
is connected to a third party BAS then the voltage
readings could be acceptable anywhere between
(0.25 VDC to 0.5 VDC).
5. If communications are occurring onthe BAS Bus
then the voltage measured in step 4 should uc-
tuate generally in the range of (0.1 VDC to 0.5
VDC) if the bus is properly terminated. The volt-
age readings may vary somewhat out of this range
depending on bus loading and the type of voltme-
ter used. If the voltage readings are uctuating in
the approximate range of (1.5 VDC to 3.5 VDC)
then it is likely there is no End of Line (EOL) ter-
mination set on the bus and that should be cor-
rected at the EOL device.
LD19997
-
+
SHLD COM
BAS Bus
Terminal Block
+
-
V
+
-
V
BAS Bus
Terminal Block
Plug
SH LD
COM
- +
FIGURE 39 - BAS BUS METER CHECKS
The meter checks detailed for the BAS
port can also be used for the CS and EQ
ports.
UPDATING THE FIRMWARE AND THE
SOFTWARE
As new chiller data maps become available, it is neces-
sary to update the SC-EQ firmware and software. The
following procedure should be followed to perform a
firmware and software update.
Updating the Firmware
To update the firmware, complete the following steps:
1. Format the USB thumb drive to FAT32.
2. Copy the current rmware.pkg from the
CHASE site.
There cannot be other les on the
USB thumb drive.
3. Download the current rmware.pkg le. If the
chiller is running, put it in the local mode, so the
SC-EQ does not affect the chiller operation dur-
ing the rmware update.
4. Insert the USB thumb drive into the J3 port on
the SC-EQ board. The rmware update starts au-
tomatically and the fault LED ashes quickly dur-
ing the update process.
5. If it does not start automatically, cycle power to
the SC-EQ board by removing and reconnecting
the power plug on the SC-EQ board.
6. When rmware update is completed, the SC-EQ
reboots. All LEDs go out and then on again. A
typical update takes more than 5 min.
7. When the SC-EQ Fault LED is off for 30 s, the
rmware upgrade is complete. The USB thumb
drive can be removed.