Optional Printer Installation; Figure 42 - I/O Board Relay Contact Architecture - York YLAA Series Installation Operation & Maintenance

SECTION 9 – SERVICE AND TROUBLESHOOTING
Each output is controlled by the microprocessor by
switching 120VAC to the respective output connection
energizing contactors, evaporator heater, and solenoids
according to the operating sequence.
120VAC is supplied to the I/O board via connections
at TB7-1, TB7-6, TB10-1, TB10-6, TB8-1 and TB9-1.
Figure 34 illustrates the relay contact architecture on the
microboard.
TB7
TB7
TB10
TB10
TB8
FIGURE 42 - I/O BOARD RELAY CONTACT
ARCHITECTURE
168

OPTIONAL PRINTER INSTALLATION

The micro panel is capable of supplying a printout
of chiller conditions or fault shutdown information at
any given time. This allows operator and service per-
sonnel to obtain data and system status with the touch
of the keypad. In addition to manual print selection,
the micro panel will provide an automatic printout
whenever a fault occurs. Detailed explanation of the
print function is given under Print Key on page 118.
SYS 1
TB7-2
COMP 1
Johnson Controls recommends the field tested WEIGH-
TRONIX model 1220 printer (or former IMP 24). This
TB7-3 LLSV 1
is a compact low cost printer that is ideal for service
SYS 1
TB7-4
COMP 2
work and data logging.
SYS 1
TB7-5
COMP 3
The WEIGH-TRONIX printer can be obtained by con-
SYS 1
tacting WEIGH-TRONIX for purchase information at:
TB7-7
HGSV
SYS 1
TB7-8
FAN 2
SYS 1
TB7-9
FAN 1
SYS 1
TB7-10
FAN 3
SYS 2
TB10-2
COMPR 1 (4)
TB10-3 LLSV 2
The part number for the printer that is packaged spe-
SYS 2
TB10-4
COMPR 2 (5)
cifically for YORK is P/N 950915576. The cable to
SYS 2
TB10-5
connect the printer can either be locally assembled
COMPR 3 (6)
from the parts listed, or ordered directly from WEIGH-
SYS 2
TRONIX under part number 287-040018.
TB10-7
HGSV
TB10-8
Parts
SYS 2
TB10-9
The following parts are required:
FAN 2
SYS 2
TB10-10
FAN 4
TB8-6
EVAP
PUMP
TB8-7
HEAT EXCH
TB8-2
HEATER
LD12722
WEIGH-TRONIX
2320 Airport Blvd.
Santa Rosa, CA 95402
Phone: 1-800-982-6622 or 1-707-527-5555
(International Orders Only)
1. WEIGH-TRONIX model 1220 printer.
2. Desk top calculator paper, 2.25" (5.7cm) wide.
3. Twisted Pair Shielded Cable (minimum 3 conduc-
tor), #18 AWG stranded, 300V minimum insula-
tion, 25 ft. (7.62m) maximum length.
4. One 25 pin Cannon connector and shell.
5. Cannon P/N DB-25P connector, or equivalent.
6. Cannon P/N DB-C2-J9 shell.
FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
JOHNSON CONTROLS