Overall Unit Inspection; Bacnet, Modbus And Yorktalk 2 Communications - York YCAL Series Installation Operation & Maintenance

SECTION 10 - MAINTENANCE

OVERALL UNIT INSPECTION

In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure proper equipment operation. Items such as
loose hardware, component operation, refrigerant
leaks, unusual noises, etc. should be investigated and
corrected immediately.
BACNET, MODBUS AND YORKTALK 2
COMMUNICATIONS
Data can be read and in some cases modified using a
serial communication BACnet, Modbus or YorkTalk 2
network connection. This information allows commu-
nications of chiller operating parameters and external
control changes to setpoint, load limiting, and start/
stop commands.
BACnet and YorkTalk 2 RS485 networks are wired to
the + and - terminals of TB1 for port 1 communica-
tions. Modbus network connection has the option of
DE MODIFIER ADDRESS
DE MODIFIER OFFSET
P1 PROTOCOL
P1 MANUAL MAC
ADDRESS
P1 BAUD RATE
P1 PARITY
P1 STOP BITS
158
RS232 or RS485 connection for port 2 communica-
tions. Modbus network is wired to either TB2 or TB3
as follows:
• RS-485: connect to TB2 - Network (-1) to TB2 (-1);
Network (+1) to TB2 (+1)
• RS-232: connect to TB3 - Network (RX) to TB3
(TXD); Network (TX) to TB3 (RXD); Network
(GND) to TB3 (GND)
Refer to Fig. 22 "Micro Panel Connections" for TB1,
TB2 and TB3 locations.
In most cases, communication parameters will need to
be modified. Table 34 "Values Required for BAS Com-
munication" lists setup parameters for the available
protocols. Modification is accomplished by pressing
the PROGRAM, DOWN ARROW, DOWN ARROW,
DOWN ARROW, DOWN ARROW, and ENTER keys
in sequence. The list below shows the displays for the
values that may be modified:
P2 PROTOCOL
XXXXX
P2 MANUAL MAC
ADDRESS
XX
P2 BAUD RATE
XXXXXX
P2 PARITY
XXX
P2 STOP BITS
XXXXX
P2 HW SELECT BIT
XXXXX
REAL TIME ERROR
X
RESET 1 = YES, 0 = NO 0
Note: See Table 35 for error descriptions
ISSUE DATE: 09/25/2020
XXXXXXXXXX
XXX
XXXXX
XXXXX
X
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JOHNSON CONTROLS
FORM 150.66-NM3