Carrier 17EX Start-up, Operation And Maintenance Instructions Manual

Also see for 17EX Series: Start up & operation manual Start-up, operation and maintenance instructions

Contents

Options Modules (8-Input) — The options modulesare optional additions to the PIC, and are used to add tem-perature reset inputs, spare sensor inputs, and demand limitinputs. Each option module contains 8 inputs, each input meantfor a specific duty. See the wiring diagram for exact modulewire terminations. Inputs for each of the options modulesavailable include the following:OPTIONS MODULE 14 to 20 mA Auto. Demand Reset4 to 20 mA Auto. Chilled Water ResetCommon Chilled Water Supply TemperatureCommon Chilled Water Return TemperatureRemote Temperature Reset SensorSpare Temperature 1Spare Temperature 2Spare Temperature 3OPTIONS MODULE 24 to 20 mA Spare 14 to 20 mA Spare 2Spare Temperature 4Spare Temperature 5Spare Temperature 6Spare Temperature 7Spare Temperature 8Spare Temperature 9Terminal block connections are provided on the optionsmodules. All sensor inputs are field wired and installed.Options module 1 can be factory or field-installed. Optionsmodule 2 is shipped separately and must be field installed.For installation, refer to the unit or field wiring diagrams. Besure to address the module for the proper module number(Fig. 54) and to configure the chiller for each feature beingused.Four-In/Two-Out Module (Fig. 55)INPUTS — The four analog inputs each have 3 terminalsand are configurable by movable on-board jumpers as ther-mistor (T), 4 to 20 mA (C), or 0 to 10 vdc (V)configurations. The inputs monitor the gear oil temperatureand pressure. Input AI#2 should be factory-set with the jumperon (T). Inputs AI#3, and AI#4 should be factory set on (V).OUTPUTS — The two analog outputs are each configurableby on-board jumpers as 0 to 10 vdc (maximum current:10 mA) or 4 to 20 mA (maximum load: 600 ohms) outputs.The outputs control the relay that activates the gear oil pumpstarter. Outputs AO#1 and AO#2 should be factory set withthe jumper on (V).This module has a field-configurable DIP (dual in-line pack-age) switch to designate its address. It should be factory setwith the following switches open: 1, 2, 3, 4, 6, and 8. Switches5 and 7 should be closed.Note the SIO bus wiring for this module. Unlike the stand-ard PIC modules, Pin 2 is negative and Pin 3 is the ground(or common). See Fig. 51.Replacing Defective Processor Modules — Thereplacement part number is printed on a small label on thefront of the PSIO module. The model and serial numbers areprinted on the unit nameplate located on an exterior cornerpost. The proper software is factory-installed by Carrier inthe replacement module. When ordering a replacement pro-cessor module (PSIO), specify complete replacement part num-ber, full unit model number, and serial number. This newunit requires reconfiguration to the original chiller data bythe installer. Follow the procedures described in the Set UpChiller Control Configuration section on page 54. Electricalshock can cause personal injury. Disconnect all electrical powerbefore servicing.Electrical shock can cause personal injury. Disconnectall electrical power before servicing.INSTALLATION OF NEW PSIO MODULE1. Verify that the existing PSIO module is defective by us-ing the procedure described in the Notes on Module Op-eration section, page 96, and the Control Modules sec-tion, page 96. Do not access the ATTACH TO NETWORKDEVICE screen if the LID displays a communicationfailure.2. Data regarding the PSIO configuration should have beenrecorded and saved. This data must be reconfigured intothe LID. If this data is not available, follow the proce-dures described in the Set Up Chiller Control Configu-ration section, page 54. Record the TOTAL COMPRES-SOR STARTS and the COMPRESSOR ONTIME from theSTATUS01 table on the LID.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 thecomputer (if the software version is the same).Any communication wires from other chillers or CCNmodules must be disconnected.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 anyof the individual wires from the connectors.4. Remove the defective PSIO by removing its mountingscrew with a long-shaft Phillips screwdriver and remov-ing the module from the control box. Save the screw forlater use. The green ground wire is held in place withthe module mounting screw.5. Package the defective module in the carton of the newmodule for return to Carrier.SWITCH SETTING OPTIONS MODULE 1 OPTIONS MODULE 2S1 6 7S2 4 2Fig. 54 — Options Module98