Trane RT-PRC031-EN manual Mechanical Specifications Cooling System Chilled Water Coil, Water Valve

Mechanical Specifications

Cooling System

Chilled Water Coil

Coils shall be of type 5W, W, or WD and have a tube in sheet design with 5/8” OD, 0.020” copper tubing mechanically bonded to aluminum fins. Headers shall be constructed of copper tubing with steel pipe connections. Coil casing shall be a minimum 16-gauge G90 galvanized steel with formed end supports and top and bottom channels.

Multiple row and fin series options shall be available including 2, 4, 6, or 8 rows and 80, 108, 144, or 168 fins per foot. Optional, performance enhancing, turbulators shall available for all chilled water coils. All coils shall be factory burst tested at 300 PSIG and leak tested at 200 PSIG.

All coils shall have drain holes. Water diverters and a double sloped galvanized drain pan shall be provided to direct condensate to both sides of the unit.

Water Valve

A 1.5”, 2.0”, 2.5”, or 3.0” water modulating valve with actuator and linkage shall be provided by the manufacturer. Valve, actuator, and linkage shall be field installed and piped by the piping contractor.

External Piping Enclosure

A piping cabinet shall be supplied by the manufacturer (factory assembled) when the chilled water cooling option is selected. The piping cabinet shall be mounted external to the air handler unit and shipped separate to be field installed. The piping cabinet shall have a removable panel.

Air Handling System

Supply Fan

Standard or low airflow supply fan shall have a single fan assembly with double width, double inlet, airfoil fan, motor and fixed pitch sheave drive. All fans shall be statically and dynamically balanced for the operating envelop. It shall be tested in the factory. Supply fans shall be test run in unit as part of the unit test. Fan operating envelop rpm shall be

below first critical speed. Fan shafts shall be mounted on two grease lubricated ball bearings designed for 200,000 hours average life. Extended grease lines shall allow greasing of bearings from section base rail. Fan motor and fan assembly shall be mounted on common base to allow consistent belt tension with no relative motion between fan and motor shafts. Entire assemblies shall be completely isolated from unit by two-inch deflection spring isolators.

Controls

Unit shall be completely factory wired with necessary control and contactor pressure lugs or terminal block for power wiring. Units shall provide an internal location for a non-fused disconnect with external handle for safety.

Unit Controller

DDC microprocessor controls shall be provided to control all unit functions. The control system shall be suitable to control CV or VAV applications. The controls shall be factory installed and mounted in the main control panel. All factory installed controls shall be fully commissioned (run tested) at the factory. The unit shall have a Human Interface Panel with a 16 key keypad, a 2 line X 40 character clear English display as standard to provide the operator with full adjustment and display of control data functions. The unit controls shall be used as a stand- alone controller, or as part of a building management system involving multiple units.

1

The unit shall be equipped with a complete microprocessor control system. This system shall consist of temperature and pressure (thermistor and transducer) sensors, printed circuit boards (modules), and a unit mounted Human Interface Panel. Modules (boards) shall be individually replaceable for ease of service. All microprocessors, boards and sensors shall be factory mounted, wired and tested.

The microprocessor boards shall be standalone DDC controls not dependent on communications with an on-site PC or a Building

Management Network. The microprocessors shall be equipped with onboard diagnostics, indicating that all hardware, software and interconnected wiring are in proper operating condition.

The modules (boards) shall be protected to prevent RFI and voltage transients from affecting the board circuits. All field wiring shall be terminated at separate, clearly marked terminal strip. Direct field wiring to the I/O boards is not acceptable.

The microprocessor's memory shall be non-volatile EEPROM type requiring no battery or capacitive backup, while maintaining all data.

2

Zone sensors shall be available in several combinations with selectable features depending on sensor.

3

The Human Interface Panel keypad display character format shall be 40 characters x 2 lines. The character font shall be 5 x 7 dot matrix plus cursor. The display shall be Supertwist Liquid Crystal Display (LCD) with blue characters on a gray/ green background which provides high visibility and ease of interface. The display format shall be in clear English.

4

The keypad shall be equipped with

16individual touch-sensitive membrane key switches. The switches shall be divided into four separate sections and be password protected from change by unauthorized personnel. The six main menus shall be STATUS, SETPOINTS, DIAGNOSTICS, SETUP, CONFIGURATION and SERVICE MODE.

Trane LonTalk® Communication Interface Module (LCI-I)

The LCI-I provides an interface to a Tracer Summit system or other control system that supports LonTalk and shall be factory installed, allowing for control and monitoring of the unit through a RS485, two-wire communication link.

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