JOHNSON CONTROLS
155
SECTION 9 – SERVICE AND TROUBLESHOOTING
Form 150.63-NM9
Issue date: 5/20/2021
9
LD12723
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 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.
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 45. Strip the outside insulation back
several inches and individual wires about 3/8 in.
(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 OBeforeDATA
key or HISTORY key.
Figure 45 - Printer to Microboard Electrical Connections
Optional printer installation
TB3-3 TXD
TB3-2 CTS
TB3-5 GND
TB3
2 RD
7 SG
5 CTS
Chiller Microboard
Printer
Do not connect shield
at printer end.
Shield (connect shield to Pin 5
of the connector.
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