York YVAA Style A, Installation Operation & Maintenance

Page: 113 / 184

SECTION 7 - OPERATION
JOHNSON CONTROLS
113
Form 201.28-NM1.1
Issue date: 08/06/2021
7
SC-EQ or E-Link BAS communications card
Received data (Control data)
The chiller receives eight data values from the SC-EQ or
E-Link. The first four are analog values and the last four
are digital values. These eight data values are used as
control parameters when in REMOTE mode. When the
unit is in LOCAL mode, these eight values are ignored.
If the unit receives no valid YorkTalk 2 transmission for
5 minutes it will revert back to all local control values.
Table 13 on page 114 lists the control parameters.
Transmitted data
After receiving a valid transmission from the SC-EQ or
E-Link, the chiller will transmit either operational data
or history buffer data depending on the History Buffer
Request, ENG PAGE 10, found in
Table 13 on page
114 . Data must be transmitted for every page. If there
is no value to be sent to a particular page, a zero will be
sent. Table 13 on page 114 shows the data values and
page listings for this unit.
LD22443
1
2
1
2
J16 J1
+12V
TB2
PORT
1
PORT
2A
5
4
3
2
1
GND
SHLD
SHLD
COMM
RS - 485
RS - 485
RS - 485
GND
485+
485-
+5V
-
+
SHLD
COMM
-
+
TB1
5 4 3 2 1 6
A
B
PORT 4
LON E-link gateway option
E-LINK GATEWAY
Connection to BACnet, Modbus
or N2 BAS network (Refer to
ELINK Installation Manual
P/N 24-10404-9 for
Installation Requirements.)
031-03478-xxx
Control Board
Connect to printer
LON FTT10
LON E-Link or SC-EQ interface requires communication
port set for YorkTalk2. See
Table 11 on page 111 f
or settings.
Figure 28 -
LON E-Link gateway option