Table of contents | Carrier 30XW325-400 specification

Features/Benefits (cont)

Easy installation

The AquaForce® 30XW screw chillers are shipped with starter and unit mounted flow switch installed and can be shipped with a full R-134a refriger- ant charge to minimize installation time. The unit provides single point power connection (using optional con- trol power transformer) and quick, easy piping connections (using Victaulic- type clamp on couplings). The 30XW 200-v, 230-v, 460-v, and 575-v units are designed in accordance with UL (Underwriters Laboratory) and UL Canada (Underwriters Laboratory, Canada) standards to minimize electri- cal inspection time.

Dual circuits

Dual independent refrigerant circuits provide reliable, dependable cooling, excellent part load operation, and redundancy. Each circuit includes its own compressor, electronic expansion valve, filter drier, and sight glass to assure operation.

High efficiency

The Aquaforce 30XW screw chiller efficiency levels meet or exceed energy efficiency requirements of ASHRAE (American Society of Heating, Ventila- tion and Air Conditioning Engineers)

90.12007 and CSA (Canadian Stan- dards Association) for both full load and part load operation and is certified to AHRI standards.

Per AHRI 550/590, chillers operate at design conditions less than one percent of the time. As a result, superior part load efficiency is required for today's chilled water applications. The 30XW chillers deliver integrated part-load

values (IPLV) as low as 0.468 kW per ton at AHRI conditions while offering the ability to operate in a broad range of applications and climates. This exceptional performance has a signifi- cant impact on energy savings and cost of ownership.

Heat recovery

The Aquaforce 30XW screw chiller provides up to 140 F (60 C) leaving condenser water (requires 300 psig [2068 kPa] condenser option) when applied in heat recovery applications. Further, the 30XW unit heat control mode can be utilized to maintain a con- stant leaving condenser water tempera- ture. Low source controls provide evaporator suction protection to pre- vent nuisance trips when operating in heat recovery applications. This flexi- ble capability allows a chiller to meet both cooling and heating requirements providing a high level of interchange- ability within a chilled water plant.

Environmental leadership

Carrier has long been committed to the environment and its sustainability. The Aquaforce 30XW screw chiller pro- vides customers with a high-efficiency, chlorine free, long-term solution unaf- fected by refrigerant phase outs. Carrier's decision to utilize non-ozone depleting R-134a refrigerant provides customers with a safe and environmen- tally sound choice without compromis- ing efficiency. In addition, R-134a refrigerant was given an A1 safety rat- ing by ASHRAE, meaning that it is among the safest refrigerants available.

Positive displacement screw compression

Positive displacement compression ensures stable operation under all load conditions without the possibility of compressor surge. High-efficiency rotary twin screw compressors with infinitely variable slide valves allow the chillers to exactly match actual load conditions, delivering excellent part load performance.

Factory testing

Aquick start-up is assured once instal- lation is complete, since each 30XW unit is manufactured at an ISO (Interna- tional Organization for Standardiza- tion) 9001:2000 listed manufacturing facility to ensure quality. In addition, all 30XW units that are shipped with a full charge of R-134a refrigerant are tested under load at the factory to provide reliable start-up.

Low starting current (inrush)

Dual circuit units stage the start up of the compressors thereby reducing the over all current draw by up to 40%.

Constant or variable evapora- tor flow

Aquaforce 30XW screw chillers are suitable for constant or variable evapo- rator flow.

Hermetic motor

The Aquaforce 30XW chiller utilizes motors that are hermetically sealed from the machine room. Refrigerant is used to cool the motor windings.

Carrier's hermetic design eliminates:

•	Compressor shaft seals that require
	maintenance and increase the likeli-
	hood of refrigerant leaks.
•	Machine room cooling requirements
	associated with air-cooled motors,

Page

Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Capacity Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,8

Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11

Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-14

Selection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-18

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19,20

Typical Control Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-24

Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26-28

Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-32

which dissipate heat to the mechan-

ical room.

• High noise levels common with air-

cooled motors, which radiate noise

to the machine room and adjacent

areas.

• Shaft alignment problems that occur

with open-drive designs during start-

up and operation, when equipment

temperature variations cause ther-

mal expansion.

Positive pressure design

Positive pressure designs eliminate the need for costly low pressure contain- ment devices, reducing the initial cost