Guide specifications

Water-Cooled Chiller

HVAC Guide Specifications

Size Range: 325 to 400 Nominal Tons (1133 to 1354 kW)

Carrier Model Number: 30XW

Part 1 — General

1.01 SYSTEM DESCRIPTION

Microprocessor controlled water-cooled liquid chiller utilizing screw compressors and electronic expan- sion valves.

1.02QUALITY ASSURANCE

A.Unit shall be rated in accordance with AHRI Stan- dard 550/590 (U.S.A.), latest edition.

B.Unit construction shall comply with ASHRAE 15 Safety Code, NEC, and ASME applicable codes (U.S.A. codes).

C.Unit shall be manufactured in a facility registered to ISO 9001:2000 Manufacturing Quality Standard.

D.200-v, 230-v, 460-v, 575-v, 60 Hz units shall be constructed in accordance with UL or UL Canada standards and shall be tested and listed by ETL or ETL, Canada, as conforming to those standards. Units shall carry the ETL and ETL, Canada, labels.

1.03DELIVERY, STORAGE, AND HANDLING

A.Unit controls shall be capable of withstanding 150 F (65.5 C) storage temperatures in the control compartment.

B.Chiller and starter should be stored indoors, pro- tected from construction dirt and moisture. An inspection should be conducted under shipping tarps, bags, or crates to be sure water has not col- lected during transit. Protective shipping covers should be kept in place until machine is ready for installation. The inside of the protective cover should meet the following criteria:

1.Temperature is between 40 F (4.4 C) and 120 F (48.9 C).

2.Relative humidity is between 10% and 80% (non-condensing).

Part 2 — Products

2.01EQUIPMENT

A.General:

Factory assembled, single-piece, water-cooled liquid chiller with dual (2) independent refrigerant circuits. Contained within the unit cabinet shall be all factory wiring, piping, controls, refrigerant charge (HFC- 134a) and special features required prior to field start-up.

B.Compressors:

1.Semi-hermetic twin-screw compressors with internal muffler and check valve.

2.Each compressor shall be equipped with a dis- charge shutoff valve.

C.Evaporator:

1.Shall be tested and stamped in accordance with ASME Code (U.S.A.) for a refrigerant working-side pressure of 220 psig (1408 kPa). Water-side pressure rating shall be 150 psig (1034 kPa). In Canada, maximum water-side pressure shall be 250 psig (1725 kPa), per the Canadian National Registry.

2.Shall be mechanically cleanable shell-and-tube type with removable heads.

3.Tubes shall be internally enhanced, seamless- copper type, and shall be rolled into tube sheets.

4.Shall be equipped with victaulic fluid connections.

5.Shell shall be insulated with 3/4-in. (19-mm) closed-cell, polyvinyl chloride foam with a maxi- mum K factor of 0.28. Heads may require field insulation.

6.Shall have a evaporator drain and vent.

7.Design shall incorporate 2 independent refrig- erant circuits.

8.Shall include isolation valves to allow isolation of the refrigerant charge in either the evapora- tor or the condenser.

9.Shall be equipped with factory-installed thermal dispersion chilled fluid flow switch.

D.Condenser:

1.Shall be tested and stamped in accordance with ASME code (U.S.A.) for a refrigerant working-side pressure of 220 psig (1408 kPa). Water-side pressure rating shall be 150 psig (1034 kPa). In Canada, maximum water-side pressure shall be 250 psig (1725 kPa), per the Canadian National Registry.

2.Shall be mechanically cleanable shell-and-tube type with removable heads.

3.Tubes shall be internally enhanced, seamless- copper type, and shall be rolled into tube sheets.

4.Shall be equipped with victaulic water connections.

5.Design shall incorporate 2 independent refrig- erant circuits.

E.Heat Machines:

1.Condenser shall be tested and stamped in accordance with ASME Code (U.S.A.) for a refrigerant working-side pressure of 300 psig (2068 kPa).

2.Design shall incorporate 2 independent refrig- erant circuits.

3.Heat machine condensers shall include factory- installed thermal insulation on the condenser, condenser flow switch and leaving water temperature sensor. Heat machine units require field-installed thermal insulation on the