VSD

Variable-Speed Drive

reduceenergy costs

longerequipment life

lowernoise level

lesserinrush current

2

YORK Variable-Speed Drive Retrofit

Cooling a building is not a constant process. The Sun rises and sets. Tenants arrive in the morning and leave in the evening. Summer is

off-set by winter. But do your energy bills fully reflect these variations? They will if you fit a YORK VSD chiller drive.

YORK’s variable-speed drive can cut chiller energy consumption by 30% or more because no constant-speed chiller, not even a high

efficiency model can match the performance of a VSD drive under the real-world plant room operating conditions.

The YORK VSD variable-speed drive was specifically developed for commercial airconditioning applications, delivering optimum efficiency

for virtually any operating condition.

Bringing Value to You:

Superior energy efficiency cuts energy cost, fast payback

Adaptive Capacity Control Logic stable surge-free operation, maximizes energy savings

Automatically corrects power factor

Soft start lesser inrush current, better electrical protection, reduces driveline wear

Low speed operation runs quieter

Direct linkage to control panel convenient monitoring and control

Single-source responsibility designed, built, installed and serviced by YORK

The Adaptive Capacity Control learns and remembers optimum motor speed and PRV position for a given set of conditions, which fine-tunes chiller performance

Chiller Water Temperature

Temperature Setpoint

Evaporator/Condenser Pressure

PRV Positio

Actual Motor Speed

Optimum Motor Speed

Optimum PRV Position

8085 75 70 65 60 55Entering Condenser Water Temp. (oF)

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

kW/t

on

TypicalCentrifugalChiller

60%100%

CentrifugalChillerWith VSD

100%60%

3

A typical chiller plant works at less than

its designed maximum performance levels

nearly 99% of the time. By optimizing

chiller operation a YORK VSD drive

accrues energy savings continuously

during off-peak times – by as much as

75% at light loads*. When condenser

water drops, so does the condenser

saturated temperature. As the compressor

head (delta P) reduces, the compressor

torque also reduces. Thus the motor

works lesser and energy consumption is

reduced. As a result, payback is fast

particularly where wet bulb temperature is

low – typically between one to three years

– but the monthly savings continue to

mount up.

With its Adaptive Capacity Control logic,

a YORK VSD drive learns how a chiller

operates and maps surge points. This

enables the fine-tuning of motor speed

and pre-rotation vane (PRV) position for

various load and water temperature

combinations – a performance no simple

variable speed drive can match.

The chil ler plant is often the biggest

energy user in a building and many

electricity companies penalize building

owners for having a low power factor. In

some installations that use constant-

speed chillers, building owners are forced

to install additional power factor correction

capacitors to overcome this problem. This

is an expensive exercise.

Chillers fitted with a YORK VSD drive

and optional filter can correct the power

factor which could do without additional

capacitor. The optional filter also meets

the guidelines of IEEE519-92 for total

harmonic distortion.

Saving Energy and Increasing Reliability

Payback Under 3 Years

* Based on ARI 550/59 – 1998 IPLV part load conditions

Impact of VSD at Off-Design Conditions

Lowers condensing water temperature

Lowers head pressure

Reduces compressor work

Reduces energy consumption

Enthalpy

Pressure

Compressor

Evaporator

Condenser

Hea

d P

ress

ure

Enthalpy

Pressure

Compressor

Evaporator

Condenser

Hea

d P

ress

ure

HighHead

HighHead

LowHead

Fast PaybackUnder 3 YearsFast PaybackUnder 3 Years

0 5 10 20 30 40

500

400

300

200

100

Time (Sec)

Inrush Current

Mo

tor

FLA

(%)

Star-Delta Starter VSD Drive

Compared to electro-mechanical starters. VSD drives reduce current inrush and motor wear.

4

A VSD’s power requirements are frugal

with start-up amps 60% lower than

conventional chiller drives. Conventional

starters can have inrush currents which

generate heat, and flexing critical points in

the motor windings. With a VSD fitted, the

chiller’s motor starts more slowly, (soft

start) never drawing more than 100% of

full-load amps, which increases motor life

and reliability. As proof, chillers controlled

by a VSD drive can be restarted in as little

as few minutes, making quick-turn,

emergency restarts possible.

And because 99% of the time it is not

running at ful l-speed, moving parts

experience less wear, increasing reliability

even further. Slower speeds also mean less

noise. With a YORK VSD in place, chiller

plant noise drops by as much as 10

decibels.

YORK’s distinctive technology is in-built in

the system with display of critical operating

conditions on the Optiview Control Centre.

This simplifies the monitoring and diagnostic

inspection. Hence problems can be

identified and resolved before it’s too late.

VSD Provides Soft Start

Head Pressure

VSD

5

Optimizes PRV position

Motor speed slows down

Optimizes compressor or efficiency

PRV closes as load decreases

Motor remains constant

Adaptive Capacity Control Logic

ConsumesLess EnergyConsumes

Less Energy

To understand how a chiller equipped with

a VSD drive can offer 30% lower energy

costs, consider the two factors that affect

energy consumption: load and entering

condenser-water temperature. A reduction

in either can save energy, however, the

method by which the chiller is controlled

can have a major impact on the magnitude

of these savings.

A constant-speed chiller reacts to lower

load or lower entering-condenser-water

temperature by closing its pre-rotation

vanes (PRV), which throttle the refrigerant

flow and save some energy. However, as

Adaptive Capacity Control Logic

VSD

The Intelligent Approach to Energy Conservationthe vanes continue to close, they create

frictional losses, reducing efficiency and

limiting energy-saving capability.

YORK’s VSD drive monitors several

operating conditions: chilled water, chilled

water set-point, evaporator and condenser

pressures, inlet vane position, and motor

speed. Differences in impeller geometry

make each chiller’s operating characteristics

unique. Adaptive Capacity Control (ACC)

logic determines the optimal motor speed

and inlet vane position – identifying your

chi l ler’s surge points – in order to

maximize efficiency and minimize energy

consumption.

YORK is your choice

YORK, a Johnson Controls Company, is a leading global provider of heating, ventilation, air conditioning, and refrigeration (HVAC&R) products and services.

Our wide breadth of product lines range from small residential room air conditioners to the largest chillers used to cool the tallest buildings, provide life support systems in the deepest diving ocean submarines, and enable critical process cooling in the petrochemical, pharmaceutical and microelectronics industries of the world.

YORK has been chosen by world-renowned organizations including the US Capitol, the Kremlin, the Sydney Opera House, the Trans-Channel Eurotunnel, the National Theatre of China, the Grand Palace of Thailand, the Hong Kong Convention & Exhibition Centre, the Kuala Lumpur City Centre and Taipei 101, the world's tallest building.

YORK reserves the right to change product features without prior notice.

Form

No.:

E-E1

7.SL.H

K(03

06)

Supe

rsede

s: E-

E17.S

L.HK(

1105

)

Asia Pacific Headquarters1 Genting Lane, #03-00 Kenwood Building, Singapore 349544Tel: +65 6748 0202 Fax: +65 6743 4420 Greater China Headquarters 15/F, Telecom Tower, Whart T & T Square, 123 Hoi Bun Rd, Kwun Tong, Kowloon, Hong KongTel: +852 2331 9286 Fax: +852 2331 9840

YORK’s Commitment - Superior Quality • Excellent Service • Distinctive Technology

www.york.com

Australia Tel: +61 (7) 3391 4772 Fax: +61 (7) 3391 4704

China (Shanghai) Tel: +86 (21) 6276 6509 Fax: +86 (21) 6277 3543

Hong Kong Tel: +852 2331 9286 Fax: +852 2331 9840

India Tel: +91 (22) 3088 1455 Fax: +91 (22) 3088 1534

Indonesia Tel: +62 (21) 626 3535 Fax: +62 (21) 659 8875

Japan Tel: +81 (0) 78 991 6885 Fax: +81 (0) 78 991 6889

Korea Tel: +82 (2) 548 2114 Fax: +82 (2) 548 3222

New Zealand Tel: +64 (9) 444 6434 Fax: +64 (9) 444 2092

Philippines Tel: +63 (2) 830 0291 Fax: +63 (2) 812 0928

Singapore Tel: +65 6284 5722 Fax: +65 6283 3015

Taiwan Tel: +886 (2) 2599 2255 Fax: +886 (2) 2599 3377

Thailand Tel: +66 (2) 721 0500 Fax: +66 (2) 721 1590

Vietnam Tel: +84 (8) 930 2820 Fax: +84 (8) 930 2822

15-25%

YORK Energy Saving Excellence

YORK’s VSD reduces chiller energy consumption by 15-25% annually

Reference Projects in Asia

Academy for Performing Arts, Hong KongCastle Peak Hospital, Hong KongCauseway Bay CRC, Hong KongChangi Water Reclamation Plant, SingaporeChina Square, SingaporeEast Point Centre, Hong KongHarbour Centre, Hong Kong HASEL, Hong KongHitachi, ThailandInfineon Technology, SingaporeJohnson & Johnson, ThailandKowloon Shangri-La Hotel, Hong KongKwai Chung Plaza, Hong KongLangham Place, Hong KongMacau Fisherman’s Wharf, Macau

Macau Government Hospital, MacauMacau Mandarin Oriental Hotel, MacauMaxim’s Food Factory, Hong KongNational University of Singapore, SingaporeOcean Centre, Hong KongOcean Terminal, Hong KongQueensway Government Office, Hong KongPlaza Singapura, SingaporeScience Park Building 9, Hong KongShenzhen Sheraton Hotel, PRCShui On Centre, Hong KongSkyplaza Building, Hong KongSun Hung Kai Centre, Hong KongTsuen Wan Plaza, Hong KongUS Embassy, Thailand

Just to name a few...