Optional Printer Installation; Figure 30 - Printer To Microboard Electrical Connections - York YLUA0078 Installation Operation & Maintenance

FORM 150.73-NM1
ISSUE DATE: 09/04/2020

OPTIONAL PRINTER INSTALLATION

The micro panel is capable of supplying a printout of
unit conditions or fault shutdown information at any
given time. This allows operator and service personnel
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" located in the Keypad and
Display section.
Johnson Controls recommends the field tested WEIGH-
TRONIX model 1220 printer (or former IMP 24). This
is a compact low cost printer that is ideal for service
work and data logging.
The printer can be obtained by contacting WEIGH-
TRONIX for purchase information at:
WEIGH-TRONIX
2320 Airport Blvd.
Santa Rosa, CA 95402
Phone: 1-800-982-6622 or 1-707-527-5555
(International Orders Only)
The part number for the printer that is packaged spe-
cifically for YORK is P/N 950915576. The cable to
connect the printer can either be locally assembled
from the parts listed, or ordered directly from WEIGH-
TRONIX under part number 287-040018.
Chiller Microboard
TB3-3 TXD
TB3-2 CTS
TB3-5 GND
Shield (connect shield to Pin 5
of the connector.

FIGURE 30 - PRINTER TO MICROBOARD ELECTRICAL CONNECTIONS

JOHNSON CONTROLS
TB3
SECTION 9 – SERVICE AND TROUBLESHOOTING
Parts
The following parts are required:
1. WEIGH-TRONIX model 1220 printer.
2. 2.25 in. (5.7 cm) wide desk top calculator paper.
3. 25 ft (7.62 m) maximum length of Twisted Pair
Shielded Cable (minimum 3 conductor), #18
AWG stranded, 300 V minimum insulation.
4. One 25 pin Cannon connector and shell.
Connector: Cannon P/N DB-25P or equivalent.
Shell: Cannon P/N DB-C2-J9.
Assembly and Wiring
All components should be assembled and wired as
shown in Figure 30 on page 149. Strip the outside
insulation back several inches and individual wires
about 3/8 in. (9.5 mm) to connect the cable at the Mi-
croboard. Do not connect the shield at the printer-end
of the cable.
Obtaining a Printout
A printout is obtained by pressing the PRINT key on
the keypad and then pressing either the OPER DATA
key or HISTORY key.
Printer
2 RD
5 CTS
7 SG
Do not connect shield
at printer end.
9
LD12723
149