Carrier EVERGREEN 23XRV User Manual download pdf (Page 26)

equipment to dissipate the motor heat as per

the following formula:

Btuh = (FLkW motor) (0.05) (3413)

Btuh = (FLkW motor) (171)

and, alternately

Tons = Btuh/12,000

The additional piping, valves, air-handling

equipment, insulation, wiring, switchgear

changes, ductwork, and coordination with other

trades shall be the responsibility of the mechan-

ical contractor. Shop drawings reflecting any

changes to the design shall be included in the

submittal, and incorporated into the final as-

built drawings for the project.

8. Also, if an open motor is provided, a mechani-

cal room thermostat shall be provided and set

at 104 F (40 C). If this temperature is

exceeded, the chillers shall shut down and an

alarm signal shall be generated to the central

Energy Management System (EMS) display

module, prompting the service personnel to

diagnose and repair the cause of the overtem-

perature condition. The mechanical contractor

shall be responsible for all changes to the

design, including coordination with temperature

control, electrical and other trades. In addition,

the electrical power consumption of any auxil-

iary ventilation and/or mechanical cooling

required to maintain the mechanical room con-

ditions stated above shall be considered in the

determination of conformance to the scheduled

chiller energy efficiency requirement.

D. Unit-Mounted Variable Frequency Drive (VFD) with

Built-In Harmonic LiquiFlo™ II Filter:

The compressor shall be factory-mounted, factory-

wired and factory-tested prior to shipment by the

chiller manufacturer. All interconnecting wiring and

piping between the VFD and the chiller shall be

factory-installed. Customer electrical connection for

compressor motor power shall be limited to main

power leads to the VFD, and wiring liquid pumps

and tower fans to the chiller control circuit. The

VFD shall incorporate the following features:

1. Design:

a. The VFD shall be refrigerant cooled,

microprocessor based, pulse width modu-

lated design. Water cooled designs are not

acceptable.

b. Input and output power devices shall be

Insulated Gate Bipolar Transistors (IGBTs).

c. Rectifier shall convert incoming fixed volt-

age/frequency to fixed DC voltage.

d. Transistorized inverter and control regulator

shall convert fixed DC voltage to a sinusoidal

PWM waveform.

e. Low voltage control sections and main

power sections shall be physically isolated.

f. Integrated controls shall coordinate motor

speed to optimize chiller performance over a

wide variety of operating conditions.

2. Enclosure:

a. Pre-painted unit mounted, NEMA 1 cabinet

shall include hinged, lockable doors and

removable lifting lugs.

b. The VFD shall have a short circuit interrupt

and withstand rating of at least 65,000 amps.

c. Provisions to padlock main disconnect han-

dle in the “Off” positions shall be provided.

Mechanical interlock to prevent opening

cabinet door with disconnect in the “On”

position or moving disconnect to the “On”

position while the door is open shall be

provided.

d. Provisions shall be made for top entry of

incoming line power cables.

3. Heat Sink:

a. The heat sink shall be refrigerant cooled.

Heat sink and mating flanges shall be suit-

able for ASME design working pressure of

185 psig (1276 kPa).

b. Refrigerant cooling shall be metered to

maintain heat sink temperature within

acceptable limits for ambient temperature.

4. VFD Rating:

a. Drive shall be suitable for operation at name-

plate voltage ±10%.

b. Drive shall be suitable for continuous opera-

tion at 100% of nameplate amps and 150%

of nameplate amps for 5 seconds.

c. Drive shall comply with applicable ANSI,

NEMA, UL and NEC standards.

d. Drive shall be suitable for operation in ambient

temperatures between 40 and 122 F (4 and

50 C), 95% humidity (non-condensing) for

altitudes up to 6000 ft (1829 m) above sea

level. Specific drive performance at jobsite

ambient temperature and elevation shall be

provided by the manufacturer in the bid.

5. User Interface:

A single display shall provide interface for pro-

gramming and display of VFD and chiller

parameters. Viewable parameters include:

a. Operating, configuration and fault messages

b. Frequency in hertz

c. Load and line side voltage and current (at the

VFD)

d. kW

e. IGBT temperature

6. VFD Performance:

a. The VFD Voltage Total Harmonic Distortion

(THD) and Harmonic Current Total Demand

Distortion (TDD) shall not exceed IEEE-519

requirements using the VFD circuit breaker

Guide specifications (cont)

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 32

Comments to this Manuals

No comments

Carrier EVERGREEN 23XRV User Manual Page 26

Comments to this Manuals

Related products and manuals for Voice network modules Carrier EVERGREEN 23XRV