FORM 150.66-NM2
ISSUE DATE: 09/25/2020
151
JOHNSON CONTROLS
SECTION 9 - SERVICE AND TROUBlEShOOTING
9
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 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.
YORK 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 WEIGH-TRONIX 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
specifically 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” (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
several 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.
OPTIONAL PRINTER INSTALLATION
Chiller I/O Board
Printer
TB3-3 TXD
TB3-2 CTS
TB3-5 GND
Shield (connect shield to
Pin 5 of the connector)
Do not connect shield
at printer end.
TB3
2 RD
5 CTS
7 SG
lD13278
FIG. 29 – PRINTER TO MICROBOARD ELECTRICAL CONNECTIONS
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