Carrier 17EX Four-In/Two-Out Module Fig, Installation of NEW Psio Module, Options Module

Options Modules (8-Input) Ð The options modules are optional additions to the PIC, and are used to add tem- perature reset inputs, spare sensor inputs, and demand limit inputs. Each option module contains 8 inputs, each input meant for a speci®c duty. See the wiring diagram for exact module wire terminations. Inputs for each of the options modules available include the following:

OPTIONS MODULE 1

4 to 20 mA Auto. Demand Reset

4 to 20 mA Auto. Chilled Water Reset Common Chilled Water Supply Temperature Common Chilled Water Return Temperature Remote Temperature Reset Sensor

Spare Temperature 1

Spare Temperature 2

Spare Temperature 3

OPTIONS MODULE 2

4 to 20 mA Spare 1

4 to 20 mA Spare 2 Spare Temperature 4 Spare Temperature 5 Spare Temperature 6 Spare Temperature 7 Spare Temperature 8 Spare Temperature 9

Terminal block connections are provided on the options modules. All sensor inputs are ®eld wired and installed. Options module 1 can be factory or ®eld-installed. Options module 2 is shipped separately and must be ®eld installed. For installation, refer to the unit or ®eld wiring diagrams. Be sure to address the module for the proper module number (Fig. 54) and to con®gure the chiller for each feature being used.

SWITCH SETTING	OPTIONS MODULE 1	OPTIONS MODULE 2
S1	6	7
S2	4	2

Fig. 54 Ð Options Module

Four-In/Two-Out Module (Fig. 55)

INPUTS Ð The four analog inputs each have 3 terminals and are con®gurable by movable on-board jumpers as ther- mistor (T), 4 to 20 mA (C), or 0 to 10 vdc (V)

con®gurations. The inputs monitor the gear oil temperature and pressure. Input AI#2 should be factory-set with the jumper on (T). Inputs AI#3, and AI#4 should be factory set on (V).

OUTPUTS Ð The two analog outputs are each con®gurable by 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 pump starter. Outputs AO#1 and AO#2 should be factory set with the jumper on (V).

This module has a ®eld-con®gurable DIP (dual in-line pack- age) switch to designate its address. It should be factory set with the following switches open: 1, 2, 3, 4, 6, and 8. Switches 5 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 Ð The replacement part number is printed on a small label on the 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 replacement module. When ordering a replacement pro- cessor module (PSIO), specify complete replacement part num- ber, full unit model number, and serial number. This new unit requires recon®guration to the original chiller data by the installer. Follow the procedures described in the Set Up Chiller Control Con®guration section on page 54. Electrical shock can cause personal injury. Disconnect all electrical power before servicing.

Electrical shock can cause personal injury. Disconnect all electrical power before servicing.

INSTALLATION OF NEW PSIO MODULE

1.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 NETWORK DEVICE screen if the LID displays a communication failure.

2.Data regarding the PSIO con®guration should have been recorded and saved. This data must be recon®gured into the LID. If this data is not available, follow the proce- dures described in the Set Up Chiller Control Con®gu- ration section, page 54. Record the TOTAL COMPRES- SOR STARTS and the COMPRESSOR ONTIME from the STATUS01 table on the LID.

If a CCN Building Supervisor or Service Tool is present, the module con®guration should have already been up- loaded into memory; then, when the new module is in- stalled, the con®guration can be downloaded from the computer (if the software version is the same).

Any communication wires from other chillers or CCN modules 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 any of the individual wires from the connectors.

4.Remove the defective PSIO by removing its mounting screw with a long-shaft Phillips screwdriver and remov- ing 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.

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