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CVHE-SB-32A 7

Purge Module

The Purge module provides control of the purge used on R-11 and R-123 low pressure

CenTraVac models. The Purge module provides all the inputs and outputs to control the purge

optimizing both purge and chiller efficiency. The Purge module resides in the purge control panel

and communicates with the Chiller module over the IPC (Interprocessor Communications Link)

uploading set points and downloading data and diagnostics.

Local Clear Language Display

The Local CLD (Clear Language Display) resides at the Chiller providing a display of chiller data

and access to operator/serviceman controls, set points and chiller setup information. All

information is stored in non-volatile memory in the Chiller module. The Local Clear Language

Display and the Chiller module work together to display and store information requiring non-

volatility.

Remote Clear Language Display Panel and Remote Clear Language Display Inter-

face Module

As an option, the Remote Clear Language Display permits the operator to remotely operate 1-4

chillers. The Remote Clear Language Display Panel works like the Local Clear Language Display

with two exceptions, (1) a Local Stop command takes precedence over all other remote or

external devices, and (2) the Remote Clear Language Display’s Custom Report and display

language are independent of the Local Clear Language Display Panel.

Options Module

The Options module satisfies control or interface requirements for a number of options. Some of

these options are stand alone, such as Generic BAS Interface; other options support either

additions or modifications to the chiller itself, such as Free Cooling. Features supported by the

Options module include Ice-Making, Heat Recovery, External Chilled Water Setpoint, and

External Current Limit Setpoint.

Module Setpoints relating to the options module:

1. %RLA compressor output (J7 3,4) 2-10 VDC out; 2 VDC = 0% RLA; 10 VDC = 120% RLA

2. External current limit input (J7 11,12) 2-10 VDC or 4-20 mA in; The range is 40% to 120%

RLA.

3. External chilled water setpoint. Input (J9 4,5) 2-10 VDC or 4-20 mA in; The range is 0 to

65°F.

Tracer Communications Interface

TCI COMM 3 is an optional module that provides a 1200 baud isolated communications link to

TRACER.

TCI COMM 4 (Tracer Summit) is an optional module that provides a 9600 baud non-isolated link

to Summit.

Trane CVHE Troubleshooting

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