Carrier 19XR Spécifications télécharger pdf (Page 17)

Technical description

■ Water-cooled packaged liquid chiller for indoor installation,

equipped with numerical control, and operating with

chlorine-free refrigerant HFC-134a.

■ Regulations

◆ The unit characteristics must be published in accordance

with ARI standards.

◆ The machines with CE marking must comply with the

following European directives:

- Pressurised equipment directive (PED) 97/23/EC

- Machinery directive 98/37/EC, modified

- Low voltage directive 73/23/EEC, modified

- Electromagnetic compatibility directive 89/336/EEC,

modified and the applicable recommendations of

European standards:

- Machine safety: electrical equipment in machines, general

regulations, EN 60204-1

- Electromagnetic emission EN 50081-2

- Electromagnetic immunity EN 50082-2.

■ Quality assurance

◆ The unit shall be designed, manufactured and tested at a

facility with a quality assurance system certified ISO 9001.

◆ The unit shall be manufactured at a facility with an

environment management system certified ISO 14001.

◆ The unit must satisfy the quality control tests in the factory

(pressure and electrical tests).

■ Designed to ensure maximum compliance with European

standard EN 60 204-1 (electrical safety), EN 50082-2 (EMC

immunity), EN 50081-2 (EMC emissions) and with EN 378

(safety).

Compressor

■ One centrifugal compressor of the high-performance, single-

stage type. Connections to the compressor casing use O rings

instead of gaskets to reduce the occurrance of refrigerant

leakage.

■ The open type impeller with machined shroud contours and

impeller diameter optimize compressor efficiency for each

specified application.

Cooler and condenser

■ Tubing is copper, high-efficiency type, with integral internal

and external enhancement. Tubes are nominal 3/4-in. OD

with nominal wall thickness of 0.635 mm measured at the

root of the fin. Tubes are rolled into tube sheets and are

individually replaceable. Tube sheet holes are double

grooved for joint structural integrity. Intermediate support

sheet spacing does not exceed 914 mm.

■ Waterboxes and nozzle connections are designed for 1034

kPa maximum working pressure unless otherwise noted.

Nozzles have grooves to allow use of Victaulic couplings.

■ The tube sheets of the cooler and condenser are bolted

together to allow for field disassembly and reassembly.

■ Waterboxes have vents, drains, and covers to permit tube

cleaning within the space shown on the drawings. A

thermistor type temperature sensor is factory installed in each

water nozzle.

■ The heat exchangers display a European code nameplate

which shows the pressure-temperature data. A pressure relief

valve is installed on each heat exchanger. A pressure relief

valve device is installed on each heat exchanger which

permits verification of the set point without transfer of the

charge.

■ Cooler is designed to prevent liquid refrigerant from entering

the compressor.

■ Tubes are individually replaceable from either end of the heat

exchanger without affecting the strength and durability of the

tube sheet and without causing leakage in adjacent tubes.

■ The condenser shell includes a FLASC (flash subcooler)

which cools the condensed liquid refrigerant to a reduced

temperature, thereby increasing the refrigeration cycle

efficiency.

Starter, auxiliary box and control box

■ Galvanized sheet steel, polyester paint finish, colour light

grey, with hinged access doors, containing:

◆ Starter (option)

◆ Auxiliary box includes control transformer for the CVC,

and the oil heater.

◆ Control box includes the processor board and the Human

Interface (CVC).

Control functions

■ Set point function

The control provides the capability to view and change the

leaving chilled water set point, entering chilled water set

point, and demand limit set point at any time during chiller

operating or shutdown periods. The controls allow for the

specification of capacity control by either leaving chilled

water or entering chilled water.

■ Service function

The control provides a password protected service function

which allows authorized individuals to:

◆ View an alarm history file which contains the last 25

alarm/alert messages with time and date stamp. These

messages are displayed in text form, not codes.

◆ Execute a chiller controls test function for quick

identification of malfunctioning components

◆ View/modify chiller configuration

◆ View/modify chiller occupancy periods

◆ View/modify schedule holiday periods

◆ View/modify schedule override periods

◆ View/modify system time and date

■ Lead/lag function

Lead/lag function automatically controls two chillers,

including the reversing sequence.

A third chiller can be added to the lead lag system as a

standby chiller.

■ Communication

Interface with other CCN devices is available as standard. A

CCN/JBus (Carrier Comfort Network) interface facilitates

communication with other BMS systems.

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