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8
General
Information
The shell-and-tube type evaporator used in each air-cooled Cold Generator
is manufactured in accordance with ASME standards. Each evaporator is
fully insulated and equipped with a drain connection. The chilled solution
temperature sensors are located on the solution outlet and the return
solution end of the evaporator.
A liquid line solenoid valve, filter drier, sight glass, thermostatic expansion
valve, and service valves (liquid and discharge) are provided on each circuit.
Standard controls for these units is a microelectronics control system that
consists of a network of modules referred to as Unit Control Modules (UCM).
The acronym UCM is used extensively throughout this document when
referring to the control system network.
These modules through Proportional/Integral control algorithms perform
specific unit functions that governs unit operation in response to chilled
water temperature leaving the evaporator. The stages of capacity control for
these units is achieved by starting and stopping the compressors.
They are mounted in the control panel and are factory wired to their
respective internal components. They receive and interpret information from
other unit modules, sensors, remote panels, and customer binary contacts to
satisfy the applicable request for cooling. Refer to the following discussion
for an explanation of each module function.
Human Interface Module (HI - Standard)
The Human Interface module enables the operator to adjust the operating
parameters for the unit using it's 16 key keypad. The 2 line, 40 character
LCD screen provides status information for the various unit functions as well
as menus for the operator to set or modify the operating parameters.
Cold Generator Module (CGM - Standard)
The Cold Generator Module (CGM) responds to cooling requests by
energizing the proper unit components based on information received from
other unit modules, sensors, remote panels, and customer supplied binary
inputs. It initiates unit operation based on that information.
Compressor Module (SCM & MCM - Size Specific)
The Compressor module, (Single Circuit & Multiple Circuit), upon receiving a
request for mechanical cooling, energizes the appropriate compressors and
condenser fans. It monitors the compressor operation through feedback
information it receives from various protection devices.
Trane Communications Interface Module (TCI)
(Used with Trane ICS™ Systems)
The Trane Communication Interface module allows external setpoints for
most of the unit functions to be communicated to the unit's UCM network via
a Trane ICS™ system or a Tracer Summit™ system. DIP Switch settings on
the TCI module for these applications should be; Switches 1, 2, and 3 are
"Off".
CSRA-SVX02A-EN
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