Replacing Defective Processor Modules - Carrier 19EF Series Start Up & Operation Manual

Terminal block connections are provided on the options
modules. All sensor inputs are field wired and installed. Op-
tions module 1 can be factory or field-installed. Options mod-
ule 2 is shipped separately and must be field installed. For
installation, refer to the unit or field wiring diagrams. Be sure
to address the module for the proper module number
(Fig. 34) and to configure the chiller for each feature being
used.
Fig. 34 — Options Module
Replacing Defective Processor Modules —
replacement part number is printed in a small label on front
of the PSIO module. The model and serial numbers are printed
on the unit nameplate located on an exterior corner post. The
proper software is factory-installed by Carrier in the replace-
ment module. When ordering a replacement processor mod-
ule (PSIO), specify complete replacement part number, full
unit model number, and serial number. This new unit re-
quires reconfiguration to the original machine data by the
installer.
Electrical shock can cause personal injury. Disconnect
all electrical power before servicing.
INSTALLATION
1. Verify if the existing PSIO module is defective, by us-
ing the procedure described in the Troubleshooting Guide
section, page 53, and Control Modules section,
page 63. Do not select the Attach to Network Device
table if the LID displays communication failure.
2. Data regarding the PSIO configuration should have been
recorded and saved. This data will have to be reconfig-
ured into the new PSIO through the LID. If this data is
not available, follow the procedures described in
the Set Up Machine Control Configuration section,
page 42.
If a CCN Building Supervisor or Service Tool is present,
the module configuration should have already been up-
loaded into memory; then, when the new module is in-
stalled, the configuration can be downloaded from the
computer.
Any communication wires from other machines or CCN
modules should be disconnected to prevent the new PSIO
module from uploading incorrect run hours into
memory.
3. Check that all power to the unit is off. Carefully dis-
connect all wires from the defective module by unplug-
ging the 6 connectors. It is not necessary to remove any
of the individual wires from the connectors.
4. Remove defective PSIO by removing its mounting screw
with a long-shaft Phillips screwdriver, and removing the
module from the control center. Save the screw for later
use. The green ground wire is held in place with the mod-
ule mounting screw.
5. Package the defective module in the carton of the new
module for return to Carrier.
6. Mount the new module in the unit control box using a
long-shaft Phillips screwdriver and the screw saved in
Step 4 above. Make sure that the green grounding wire
is reinstalled along with the mounting screw.
7. Connect the LID communication wires (Level II bus)
and the power wires only. If CCN wiring or wiring to
other machines has been attached to the Level II bus,
disconnect the wires.
8. Carefully check all wiring connections before restoring
power.
9. Restore control power and verify that the red and green
LEDs on the PSIO are functioning properly.
10. Access the Attach to Network Device table on the LID
Service menu. Set the local device address to Bus
The
0, Address 90. Press the ATTACH softkey to upload
the PSIO software tables into the LID.
11. Change the address of the PSIO in the Config table of
the Equipment Configuration table back to the previous
value. Write the address on the PSIO.
12. Use the configuration sheets to input set point, configu-
ration, and schedule information into the PSIO. The Time
and Date table also must be set. A Building Supervisor
can be used to download the old configuration into the
PSIO.
13. Perform a Control Test and verify all tests.
If the software version has been updated, a CCN down-
load of the configuration will not be allowed. Configure
the PSIO by hand, and upload the PSIO into the net-
work by using the Attach to Network Device table.
14. Restore chiller to normal operation, calibrate motor amps.
65