JOHNSON CONTROLS
144
FORM 150.27-NM1
ISSUE DATE: 09/30/2015
SECTION 9 – SERVICE AND TROUBLESHOOTING
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 located in
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 WEIGH-TRONIX printer can be obtained by con-
tacting 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 Johnson Controls is P/N 950915576. The
cable to connect the printer can either be locally as-
sembled 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. 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.
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
insulation back several inches and individual wires
about 3/8" (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.
OPTIONAL PRINTER INSTALLATION
LD12723
FIGURE 39 -
PRINTER TO MICROBOARD ELECTRICAL CONNECTIONS
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.
