York OPTIVIEW YK, Service Instructions Manual

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233
SECTION 27 - LARGE TONNAGE CHILLER (LTC) I/O BOARD 031-02895-000/001
FORM 160.54-M1
ISSUE DATE: 10/25/2019
JOHNSON CONTROLS JCI COMPANY CONFIDENTIAL
27
+5 VDC Digital inputs (-001 Board only)
There are 2 each +5 VDC TTL inputs.
Figure 85 on
page 233 is a detail of an input and is representative
of all of these inputs. Each input accepts an open/close
input that can be configured in either pull-up configura-
tion (+5 VDC when open/0 VDC when closed) or pull-
down configuration (0 VDC when open/+5 VDC when
closed). It is connected between the +5 VDC and the DI
input for a pull-up configuration; between the GND and
DI input for a pull-down configuration. Under Program
control, the pull-up/pull-down selector switch connects
the input load resistor to 5 VDC (pull-up) or
ground (pull-down) per the requirements of the input.
INPUT CONNECTION LED
DI7 TB21-1 +5 VDC CR26
-2 DI7
-3 GND
DI8 TB21-4 +5 VDC CR27
-5 DI8
-6 GND
DIGITAL OUTPUTS
Relay Outputs (-001 Board only)
There are 2 each 120/240 VAC relay contact outputs. Fig-
ure 86 on page 233 is a detail of an output and is rep-
resentative of all these outputs. Each relay has one set of
normally open contacts that are closed and opened under
Program control. The relay contact rating is 250 VAC, 5
amps resistive, 2 amps inductive. Each output is connected
between the respective COM(X) and NO(X) terminals.
OUTPUT CONNECTION
DO1 TB17-1 COM1
-2 NO1
DO2 TB16-1 COM2
-2 NO2
FIGURE 86 - RELAY OUTPUTS
LD14234
+12V
DO3
TB11
OPEN COLLECTOR
1
2
+12VDC
TB17
RELAY OUTPUTS
1
2
COM
DO1
NO
TB15
TRIAC OUTPUTS
1
2
RET
DO5
Triac Outputs (-001 Board only)
There are 4 each 24/120 VAC triac outputs.
Figure 87
on page 233 is a detail of an output and is representa-
tive of all these outputs. Each output can switch 2 amps
at 17-132 VAC. Each output is connected between the
respective RET and DO(X) connection.
OUTPUT CONNECTION
DO5 TB15-1 Ret
-2 DO5
DO6 TB14-1 Ret
-2 DO6
DO7 TB13-1 Ret
-2 DO7
DO8 TB12-1 Ret
-2 DO8
FIGURE 87 - TRIAC OUTPUTS
LD14234
+12V
DO3
TB11
OPEN COLLECTOR
1
2
+12VDC
TB17
RELAY OUTPUTS
1
2
COM
DO1
NO
TB15
TRIAC OUTPUTS
1
2
RET
DO5
FIGURE 85 -
+5 VDC DIGITAL INPUT
LD14233
OPTO
COUPLER
TB20
120VAC
1
2
DI1+
DI1-
TB21
5VDC TTL
1
2
3
5V
+5VDC
5.1K
DI7
GND
+5VDC
GND
PULL DOWN
SELECT FROM
PROCESSOR
TB21
5VDC TTL
1
2
3
5V +5VDC
5.1K
DI7
GND
+5VDC
GND
PULL UP
SELECT FROM
PROCESSOR