How UCP2 uses Sensing, Detecting and Recovery (SDR) to Prevent Crystallization

The objective of SDR is to detect the onset of crystallization by continuously sensing the critical cycle temperature points and executing a recovery cycle as appropriate. In the worst case, SDR is designed to shut the machine down safely when reliable operation is not possible. The LTHX concentration control is designed to maintain a predetermined temperature margin. The SDR system feature provides a secondary line of defense against crystallization beyond the routine LTHX concentration control system. The SDR feature protects the machine from transient conditions the machine does not control. This system replaces the PCL float and logic of prior designs.

Reliability

All major components of the new Horizon two-stage absorption chiller were selected based on a 20 year minimum design life. Major components include tubes, shells, internal parts, waterboxes, unit piping, solution heat exchangers, and pumps. Extensive testing was performed on these components (such as material corrosion rates) in the Trane laboratory.

This product was designed to operate reliably in your system. Here are some features which provide dependable performance:

• UCP2 Controls

• Industrial grade quality materials which include:

— Stainless steel material for key components of the chiller including evaporator pan and mist eliminators

— Cupronickel tubes in the absorber and second stage generator

— Effective, environmentally friendly corrosion inhibitors

• Fixed and floating tube supports which allow for expansion of tubes without problems of high stress

• 50,000 hours design life solution pumps

• Hermetic integrity resulting from superior design and manufacturing processes

• Factory leak tested

Ease of Installation

• Modular design to facilitate reliable disassembly and reassembly for easy access into existing buildings

• Victaulic^™ water connections

• Factory mounted and commissioned controls complete with sensors, drives, valves, actuators and purge

• Factory installed crossover pipe cuts down on field fabrication and labor

• Factory mounted steam valve

Dedicayed Support

• Over 35 years of continuous absorption production and customer support

• The only North American chiller manufacturer to commercialize double effect absorption over 20 years ago

• Professional engineering expertise from the local Trane sales office with headquarters applications, and engineering support

Serviceability

• All tubes individually replaceable

• Removable absorber, evaporator and generator spray tree systems

• Marine style waterboxes on absorber and condenser allowing tube cleaning without removing water connections

• Training of owner’s operating personnel

• Quality post-warranty service from trained technicians

• Parts readily available

• Professionally trained service personnel locally and backed by headquarters experts

• Customizable extended warranty plans

Controls

• Improved reliability and performance

• Factory installed and commissioned

• Proportional integral derivative (PID) control. Adaptive Control™ strategies for stable, efficient, reliable, and optimal chilled water temperature control

• Easy-to-use operator interface

— Two line 40 character backlit LCD display in clear language

— English or SI units

— Standard and custom reports

— Over 200 diagnostics including time and date stamping

• Complete range of standard safety controls including: pump motor protection, low refrigerant water temperature cutout, low leaving water temperature cutout, high interstage pressure cutout

• Integration with Trane’s building automation systems — all via a single twisted wire pair

• Building Automation System (BAS) interface capabilities

Pumps

The machine solutions are circulated by four hermetic, single stage centrifugal pumps. The pump impellers are cast iron. The motor shafts are steel and extend out to support the pump impeller. The motor/pump shaft is supported by two tapered carbon bearings. The bearings are lubricated and the motor is cooled by the fluid that is pumped. This eliminates the need for external piping or filtration. In addition, an adjustable frequency drive control is provided for flow control of the low temp generator and absorber spray solution.

Waterboxes

Marine style waterboxes are provided for the cooling water side only. Provisions have been made to allow for support of box covers during removal. All water boxes are designed for standard working pressure of 150 psig.

Inhibitors

Lithium molybdate is used as the corrosion inhibitor and has the following characteristics:

• Non-hazardous

• Will control corrosion of steel, copper and stainless steel materials at the conditions during operation and shutdown of the chiller

• Stable chemical over the entire operating range of the chiller. Will not break down if oxygen is present

Performance Additive

The performance additive is octyl alcohol. This chemical has the following features:

• Non-hazardous

• Stable over the range of operating conditions that it is exposed to during shutdown and operation of the chiller

No CFC’s

In addition to the design benefits of using an absorption machine, the Trane Horizon™ two-stage steam absorption chillers are completely ozone friendly. They contain no CFC’s. All cooling is achieved using lithium bromide as the absorbent and water as the refrigerant.

Factory Tests

Factory leak tests are performed to assure the machines are leak-free before shipment. The final leak test involves the use of a helium mass spectrometer. The mass spectrometer is so sensitive to helium it can detect a leak that will pass only one pound of helium in 10,000 years.