Carrier 19XL - Manual (Page 239)

Installation
1. Verify if the existing PSIO module is defective, by using the procedure described in the
Troubleshooting Guide section, and Control Modules section. 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 reconfigured into the LID. If this data is not available, follow the procedures
described in the Set Up Machine Control Configuration section.
If a CCN Building Supervisor or Service Tool is present, the module configuration should
have already been uploaded into memory; then, when the new module is installed, the con-
figuration 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 disconnect all wires from the defective
module by unplugging 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 box. Save the screw for later use.
The green ground wire is held in place with the module mounting screw.
5. Package the defective module in the carton of the new module for return to Carrier.