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FORM 150.73-NM2
ISSUE DATE: 09/07/2020
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 person-
nel 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 w 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 33 - 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" (5.7cm) wide desk top calculator paper.
3. 25 ft. (7.62m) maximum length of Twisted Pair
Shielded Cable (minimum 3 conductor), #18 AWG
stranded, 300V 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 Fig. 29. Strip the outside insulation back sev-
eral inches and individual wires about 3/8" (9.5 mm)
to connect the cable at the Microboard. 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
143
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Troubleshooting
