York Eco R 407c User Manual

FORM 100.50-EG1 (201)

Packaged Rooftop

Air Conditioning Units

00406VIP

R-407C OPTIMIZED

50 THROUGH 65 TONS

FORM 100.50-EG1

PAGE

FIGURES

Packaged Rooftop Air Conditioning Unit .................................................. 4

Single-Point Power Supply Wiring .......................................................... 31

Single-Point Power Supply Wiring with Non-Fused Disconnect ............. 32

Dual-Point Power Supply Wiring ............................................................ 33

Field Control Wiring ............................................................................... 34

General Arrangement Drawing – Bottom Return, Bottom Supply ........... 35

General Arrangement Drawing – Rear Return, Left or Right Supply ...... 36

Curb Layout Drawing.............................................................................. 37

NOMENCLATURE

BASIC MODEL NUMBER

1 2 3 4

BASE PRODUCT TYPE

5 6 7

NOMINAL CAPACITY

8 9

11 12

13 14

DUCT LOCATIONS

15 16

DESIGN SPECIAL

APPLICATION REFRIGERANT VOLTAGE

0: 50-ton

5: 55-ton

0: 60-ton

5: 65-ton

B : R-407C

: 200 / 3 / 60

: 230 / 3 / 60

: 460 / 3 / 60

: 575 / 3 / 60

: Rev. Level A

: Std. Product

: Special

: YORK

: Packaged

Rooftop

: Air-Cooled

: Bottom Supply

: Left Supply

: Right Supply

: Bottom Return

: Front Return

: Side Return

: Scroll

: Cooling Only

: Constant Volume

: VAV, VFD

: VAV, VFD w/ Manual Bypass

YORK INTERNATIONAL

Introduction

00406VIP

FIG. 1 – PACKAGED ROOFTOP AIR CONDITIONING UNIT

FEATURES/BENEFITS

in two directions conforming to ASHRAE 62n, this

drain pan swiftly minimizes any condensate within

the unit. Best of all, the drain pan is accessible for

periodic cleaning required by IAQ standards.

Ecological and Economical Design

• First packaged RTU with 407C optimized design

• Smart ventilation – YORK maintains the leader-

ship role in IAQ products with adaptive ventilation

control. The OptiLogic^TMcontrols provide continu-

ous monitoring of air quality and take action by open-

ing the outside air dampers, bringing in the right

amount of fresh air before air impurities reach un-

comfortable or even dangerous levels.

• Cooling and Heating – Superior operating perfor-

mance provides lower operating costs. Smaller

steps of cooling capacity provide tighter control of

building environment and occupant comfort while

optimizing energy efficiency.

• Indoor Air Quality (IAQ) – Outside air economiz-

ers provide energy savings in free cooling mode,

and can provide a healthier and more comfortable

building environment by introducing fresh outside air

into the building as needed. Indoor Air Quality (IAQ)

requirements for building ventilation and comfort are

controlled through the microprocessor control panel.

Optional air flow measurement provides an accu-

rate means of tracking air quality and alerting the

occupants or building owner to unhealthy situations.

• Air flow measurement – Precise measurement

of ventilation air flow is possible using an air flow

measurement station which can be installed in the

economizer section. Proper ventilation air flow is

required to ensure sufficient fresh air is in the build-

ing. A myriad of air flow measurement options are

available from minimum air flow to high-accuracy

full air flow capabilities. The complete system is

designed as an integrated component of the

OptiLogic^TMcontrol system to ensure optimum sys-

tem performance.

• High-Efficiency Motors – High-efficiency motors are

available for optimum energy efficiency. All motors

used on the eco²packaged rooftop air conditioner

meet U.S. EPACT 1992 minimum requirements.

• Double-wall construction – Rigid double-wall

construction throughout provides ease of clean-

ing and protects against insulation fiber entrain-

ment in the breathable air. Double-wall construc-

tion also helps improve the acoustical character-

istics of the air handling unit.

Indoor Air Quality (IAQ)

• Double-sloped stainless steel drain pan – This

double-sloped inclined stainless steel drain pan fa-

cilitates removal of evaporator condensate. Sloped

YORK INTERNATIONAL

FORM 100.50-EG1

• Enhanced filtration – The Eco²unit gives design-

ers the flexibility to meet various IAQ requirements

with a full range of rigid and throwaway filters at

various efficiency levels.

Serviceability

• OptiLogic^TM– fully-integrated factory-packaged

controls are standard on every unit and include a

display unit with a 4x20 character LCD display.

OptiLogic^TMcontinually monitors all control setpoints

and configurations. If a unit or control component,

or sensor fails, the controller notifies the user of a

problem. If desired, YORK service can provide re-

mote monitoring and automatically schedule a ser-

vice technician to make the repair and maintain your

comfort.

Reliable Scroll Compressor Technology

Reliable, efficient, trouble-free operation is the true mea-

sure of a packaged rooftop’s value. That’s why YORK

Eco²Packaged Rooftop Air Conditioners use estab-

lished scroll-compressor technology to deliver depend-

able, economical performance in a wide range of appli-

cations. With the Eco²Packaged Rooftop, you get the

latest generation of compressor enhancements added

to the scroll’s inherent strengths. The simplicity of a

hermetic scroll compressor allows the use of fewer

moving parts to minimize breakdown. YORK also em-

ploys the latest sealing technology to avoid metal-to-

metal contact. Axial sealing is accomplished with float-

ing tip seals, while radial sealing utilizes a microcushion

of oil. The result: a maintenance-free compressor pro-

viding minimum wear and maximum runtime.

• Access doors – full-sized access doors provide

easy access into the unit for routine maintenance

and inspection.

• Suction & discharge service valves – oversized

service valves to provide isolation and quick recla-

mation and charging of system refrigerant are avail-

able to minimize downtime and simplify the service

and repair task.

• VFD Fan Motor Control with Manual Bypass –

Optional manual VFD bypass reduces time required

for troubleshooting, commissioning and system

balancing.

A scroll compressor operates with two scroll members—

a fixed scroll and an identical orbiting scroll turned 180

degrees, like two hands curled and interlocked together.

As the orbiting scroll oscillates against the fixed scroll,

it traps and compresses suction gas inside involute

pockets. As the orbiting scroll moves, the gas is com-

pressed into the central area, where it is discharged as

compressed gas. High efficiency is achieved through a

precisely controlled orbit and the use of advanced scroll

geometry. There is no wasted motion. All rotating parts

are statically and dynamically balanced to ensure opti-

mal performance over the long haul.

• Convenience Outlet – for maintenance tasks re-

quiring power tools, an optional 110V GFCI power

supply can power lights, drills or any other power

hand tool needed.

• Filter Maintenance Alarm – An optional filter main-

tenance alarm indicates when a filter becomes dirty

and requires replacement or cleaning.

Install with Ease and Safety

Balanced components and precision machining also

ensure that smooth compression occurs in all involute

pockets simultaneously. When compression forces are

equally distributed over the entire scroll surface, equal

forces in opposing directions cancel one another, mini-

mizing any imbalance. Consequently, compression is

smooth, continuous, and quiet. Vibration isolators on

each compressor handle normal vibration. For extra

quiet operation, acoustic sound blankets for each com-

pressor are available as options.

• Factory run-tested – Each unit is subjected to a

series of quality assurance checks as well as an

automated quality control process before being run-

tested. Fans and drives are balanced at the factory

during testing. The factory run-test ensures safe,

proper operation when the unit is installed and re-

duces installation and commissioning time.

• Single-point power connection – Single-point

power connection reduces installation time by pro-

viding a single point for incoming power, including

YORK INTERNATIONAL

Introduction

the optional convenience outlet. All incoming power

is connected in one location, reducing the cost of

field-supplied and installed power wiring.

on all systems offering higher rooftop cooling ca-

pacity than competitive units.

• Hot Gas Bypass –Optional on constant volume units,

hot gas bypass reduces the cycling of compressors

which helps prolong the life of the equipment.

• Factory-mounted and wired controls – All con-

trol points within the unit are factory-installed, wired

and tested. The OptiLogic^TMcontrols can commu-

nicate with BACNet IP.

• Supply Air Openings – Side supply connections

are available on select configurations, offering more

flexibility for duct layout and improving sound trans-

mission characteristics.

• Non-fused disconnect – A factory-installed non-

fused disconnect switch simplifies unit installation

and serviceability by reducing installed labor costs.

The disconnect switch is interlocked with the power

cabinet ensuring that all power to the unit has been

disconnected before servicing.

• Compressor Sound Blankets – For applications

in sound-sensitive areas, compressor sound blan-

kets are available to reduce sound emitted from

the rooftop unit.

• Fan Spring Isolators – One-inch spring isolation

is used to prevent vibration transmission from the

rooftop unit’s supply fan to the building. Two-inch

spring isolation is also available.

Design Flexibility

• Low Ambient Operation – Head-pressure control

is accomplished via a VFD motor controller rather

than an inefficient and noisy condenser fan damper.

By varying the speed of the condenser fan, better

control and quieter operation is obtained during the

colder months. Low ambient controls are available

• Harsh Environments – A variety of coil coating and

materials are available as well as hail guards to pro-

tect coils from weather damage. Seismic and hurri-

cane duty curbs and fan restraints are available.

YORK INTERNATIONAL

FORM 100.50-EG1

Physical Data

TABLE 1 – PHYSICAL DATA

MODEL SIZE

GENERAL DATA

Length (Inches)

Width (Inches)

336

Height (Inches)

Operating Weights (Lbs.) (base unit, no options)

Cooling Only (Rigging & Refrigerant)

Rigging Weights (Lbs.) (base unit, no options)

Cooling Only

8,080

8,010

8,290

8,210

8,530

8,440

8,740

8,640

Option Weights (Lbs.)

Power Exhaust (Blower, motor, fan skid & mod damper)

Power Exhaust (Blower, motor, fan skid, VFD & baro damper)

100% AMS (Measurement Station & Mounting)

25/75% AMS (Measurement Station & Mounting)

Min. AMS (Measurement Station & Mounting)

Barometric only

647

654

110

130

647

654

110

130

647

654

110

130

647

654

110

130

Condenser Hail Guard

Copper Condenser Coils

Copper Evaporator Coils

Roof Curb Weights (Lbs.)

14" Full Perimeter Roof Curb

14" Open Condenser Roof Curb

Compressor Data

617

262

617

320

793

400

793

500

787

555

787

555

787

555

787

555

Quantity / Size (Nominal Tons )

Type

4/13

Scroll

4/13

Scroll

4/15

Scroll

4/15

Scroll

Capacity Steps (%)

25, 50, 75, 100 25, 50, 75, 100 25, 50, 75, 100 25, 50, 75, 100

Supply Fan and Drive

Quantity

Type

Size

25-22

Motor Size Range (min. to max. HP)

Air Flow Range (min. to max. cfm)

Static Pressure Range (min. to max. ESP)

Exhaust Fan

7.5-40

10000-22500

0-4"

7.5-40

12000-24000

0-4"

7.5-40

14000-27000

0-4"

7.5-40

14000-27000

0-4"

Quantity

Type

Size

15-15

5-20

0-20000

0-1"

15-15

5-20

0-20000

0-1"

15-15

5-20

0-20000

0-1"

15-15

5-20

0-20000

0-1"

Motor Size Range (min. to max. HP)

Air Flow Range (min. to max. cfm)

Static Pressure Range (min. to max. ESP)

Evaporator Coil

Size (square feet)

48.8

3/8

48.8

4/8

48.8

4/12

48.8

5/10

Number of rows/fins per inch

Tube Diameter/Surface

Condenser Coil (Aluminum Fins)

Size (square feet)

1/2"/enhanced 1/2"/enhanced 1/2"/enhanced 1/2"/enhanced

121.3

3/14

3/8"

121.3

3/14

3/8"

121.3

3/18

3/8"

121.3

3/18

3/8"

Number of rows/fins per inch

Tube Diameter

Condenser Coil (Copper Fins – Opt)

Size (square feet)

121.3

3/14

3/8"

121.3

3/14

3/8"

121.3

3/18

3/8"

121.3

3/18

3/8"

Number of rows/fins per inch

Tube Diameter

YORK INTERNATIONAL

Physical Data (continued)

TABLE 1 – PHYSICAL DATA (Cont’d)

MODEL SIZE

GENERAL DATA

Condenser Fans

Quantity

Type

Diameter (inches)

Prop.

Filters – 2" throwaway

Quantity

Size (length x width) (in.)

Total Filter Face Area (square feet)

Filters – 2" cleanable

Quantity

Size (length x width) (in.)

Total Filter Face Area (square feet)

Filters – 2" pleated (30% efficient)

Quantity

25x16 25x20 25x16 25x20 25x16 25x20 25x16 25x20

63.9 63.9 63.9 63.9

25x16 25x20 25x16 25x20 25x16 25x20 25x16 25x20

63.9 63.9 63.9 63.9

Size (length x width) (in.)

Total Filter Face Area (square feet)

Filters – 12" rigid 65%, 2" 30% prefilter

Quantity

25x16 25x20 25x16 25x20 25x16 25x20 25x16 25x20

63.9

Size (length x width) (in.)

Total Filter Face Area (square feet)

Filters – 12" rigid 95%, 2" 30% prefilter

Quantity

16x20 25x16 25x20 16x20 25x16 25x20 16x20 25x16 25x20 16x20 25x16 25x20

44.6

Size (length x width) (in.)

Total Filter Face Area (square feet)

Filters – 2" carbon (30% efficient)

Quantity

16x20 25x16 25x20 16x20 25x16 25x20 16x20 25x16 25x20 16x20 25x16 25x200

44.6

Size (length x width) (in.)

Total Filter Face Area (square feet)

Refrigerant

25x16 25x20 25x16 25x20 25x16 25x20 25x16 25x20

63.9

HFC-407C

Minimum OA Temp. for Mech. Clg. (°F)

Low Ambient Option Min. OA Temp. (°F)

YORK INTERNATIONAL

FORM 100.50-EG1

Application Data

LOCATION

Spreader bars must be used to prevent damage to the

unit casing. All lifting lugs must be used when lifting the

rooftop unit.

Of the many factors that can affect the acoustical char-

acteristics of a rooftop installation, one of the most im-

portant is the unit location. Ideally, the rooftop unit should

be installed away from sound-sensitive areas, such as

conference rooms, auditoriums and executive offices.

Possible locations could be above storage areas, hall-

ways, mechanical or utility rooms, or bathrooms.

Care must be taken to keep the unit in the upright posi-

tion during rigging and to prevent damage to the water-

tight seams in the unit casing. Avoid unnecessary jar-

ring or rough handling.

Ground Level Locations

The eco²air conditioning units are designed for out-

door installation. When selecting a site for installation,

be guided by the following conditions:

It is important that the units be installed on a substan-

tial base that will not settle, causing strain on the refrig-

erant lines and sheet metal and resulting in possible

leaks. A one-piece concrete slab with footers extended

below the frost line is highly recommended. Addition-

ally, the slab should not be tied to the main building

foundation as noises may be transmitted into the build-

ing structure.

• Unit must be installed on a level surface.

• For the outdoor location of the unit, select a place

having a minimum sun exposure and an adequate

supply of fresh air for the condenser.

For ground level installations, precautions should be

taken to protect the unit from tampering by, or injury to,

unauthorized persons. Erecting a fence around the unit

is another common practice.

• Also avoid locations beneath windows or between

structures.

• Optional condenser coil protection should be used

for seashore locations or other harsh environments.

• The unit should be installed on a roof that is struc-

turally strong enough to support the weight of the

unit with a minimum of deflection. Extreme caution

should be taken when the unit is mounted on a wood

structured roof. It is recommended that the unit(s)

be installed not more than 15 feet from a main sup-

port beam to provide proper structural support and

to minimize the transmission of sound and vibra-

tion. Ideally, the center of gravity should be located

over a structural support or building column.

ECONOMIZER

The economizer section is used for ventilation of the

conditioned space to maintain indoor air quality, and

also to reduce energy consumption by using outdoor

air cooling in lieu of mechanical cooling. If outdoor air

is appropriate for cooling, but not sufficient for the cool-

ing demand, mechanical cooling will stage on as nec-

essary until the cooling load is met.

Comparative enthalpy operation is the most accurate and

efficient means of economizer operation. The OptiLogic^TM

control monitors the return and outside air energy con-

tent, and selects the lower of the two for operation.

• Location of unit(s) should also be away from build-

ing flue stacks or exhaust ventilators to prevent pos-

sible reintroduction of contaminated air through the

outside air intakes.

• Be sure the supporting structures will not obstruct

the duct, gas or wiring connections.

VAV SUPPLY AIR PRESSURE CONTROL

• Proper service clearance space of 6-feet around

the perimeter of the unit and 12-feet to any adja-

cent units is required to eliminate cross contami-

nation of exhaust and outdoor air, and for mainte-

nance tasks such as coil pull and cleaning. No ob-

structions should be above the condensing unit

section.

Traditional packaged rooftop systems use inlet guide

vanes (IGVs) for duct static pressure control. These con-

trol supply duct pressure by modulating dampers (intro-

ducing losses and inefficiencies) on the intlet of the fan,

open and closed. Variable frequency drives (VFDs) of-

fer superior fan speed control and quieter, energy effi-

cient operation.

RIGGING

IGV inefficiency can be compared to the operation of a

car. Modulating air flow with an IGV is like pressing on

the gas to drive the car, but modulating the speed of the

car by simultaneously pressing on the brake. VFD modu-

lation is speed modulation by using just the gas pedal.

Proper rigging and handling of the equipment is man-

datory during unloading and setting it into position to

retain warranty status.

YORK INTERNATIONAL

Application Data (continued)

For VAV applications, the YORK eco²unit uses a VFD

to modulate fan speed and maintain a constant duct

static pressure. VFDs offer superior control over the

operation of the unit at part load, and offer the addi-

tional benefits of quieter and more efficient operation

when compared to IGV.

BUILDING EXHAUST SYSTEMS

Building exhaust systems are often necessary when

economizers are used to bring in outdoor air. Without

proper building exhaust, the building may become over-

pressurized. The exhaust system maintains the proper

building pressure by expelling the appropriate amount

of air from the building. Exhaust systems are typically

designed to exhaust approximately 10% less air than

what is entering the building. This provides a slight posi-

tive pressure on the building.

HARSH ENVIRONMENTS – CONDENSER AND

EVAPORATOR COIL PROTECTION

For harsh environmental conditions such as seashore

applications, YORK offers three types of coil protec-

tion: copper fin material, black fin and Technicoat coat-

ings. YORK recommends that for corrosive environ-

ments that copper fins be used to protect the evapora-

tor and/or condenser coils. In areas where chemicals

that can corrode copper are present, such as ammo-

nia, YORK recommends that the black fin or Technicoat

coating be used for maximum protection.

100% modulating exhaust with building static

pressure sensing and control

The 100% exhaust system can be configured with ei-

ther control actuated dampers or VFDs for modulating

control. The unit controller monitors the building pres-

sure using a differential pressure transducer and main-

tains the required building static pressure by modulat-

ing the exhaust control. If the building has other means

of exhaust or building pressure is not important, on/off

or barometric control may be used.

Copper Fin Condenser Coil

Copper fins can be used instead of aluminum for addi-

tional corrosion protection, however it is not suitable

for areas that are subject to acid rain or exposed to

ammonia.

100% modulating exhaust with fan on/off control

The 100% exhaust system can be configured for on/off

operation eliminating the expense of the damper ac-

tuators or VFDs. This exhaust system can be controlled

by either the outside air damper position, or a building

static pressure sensor.

Pre-Coated Condenser Fins

Black fin coating (yellow fin for evaporator fins) is pre-

coated application epoxy on aluminum fin stock to guard

from corrosive agents and insulate against galvanic po-

tential. It is used for mild seashore or industrial loca-

tions. This can provide corrosion resistance comparable

to copper fin coils in typical seashore locations.

Barometric exhaust

Barometric exhaust can be used when smaller amounts

of air at low static pressure variations within the build-

ing or other means of building exhaust are employed.

Barometric exhaust is commonly used where there are

only small fluctuations in building pressure or where

building static pressure control is not necessary.

Post-Coated Condenser Fins

Technicoat (a post-coated application of epoxy) can be

used for seashore and other corrosive applications with

the exception of strong alkalides, oxidizers, wet bro-

mide, chlorine and fluorine in concentrations greater

than 100 ppm.

ROOF CURB

Optional 14-inch full-perimeter or open condenser roof

curbs can be provided if necessary for mounting to

the building roof. These curbs come disassembled and

require installation in the field. For bottom supply and

return duct openings, the curbs have matching con-

nections to ease installation. A pipe chase that

matches the rooftop unit is also included in the curb

footprint for through-the-curb utility connections.

Any of the above suitable options should be selected

based on the particular project design parameters and

related environmental factors. The application should

be further reviewed and approved by the consulting en-

gineer or owner based on their knowledge of the job

site conditions.

YORK INTERNATIONAL

FORM 100.50-EG1

The curb should be located according to the location

recommendations above, and properly sealed to pre-

vent moisture and air leakage into and out of the duct

system. Flexible collars should be used when connect-

ing the duct work to prevent unit noise transmission

and vibration into the building.

and the unit requires a modulating economizer, 2-inch

pleated filters, bottom supply and bottom return air open-

ings and is constant volume.

Select Unit:

1. Determine the internal static pressure drop of the

cabinet by referencing Table 8.

Duct work should be supported independently of the

unit.

Wet evaporator coil

0.54

0.14

0.13

0.10

0.24

0.31

Bottom supply opening

Bottom return opening

2-inch pleated filters

Economizer openings

Modulating economizer dampers

ACOUSTICAL CONSIDERATIONS

The eco²unit is designed for lower sound levels than

competitive units by using flexible fan connections, fan

spring isolators, double-wall construction, and lower

speed and horsepower fans. For VAV applications,

VFDs are used instead of inlet guide vanes. Additional

sound attenuation can be obtained using compressor

sound blankets and field-supplied sound attenuators

when necessary.

Total 1.46 IWG

2. Determine the total static pressure by adding the

internal to the external static pressure.

TSP = 1.46 IWG + 2.25 IWG

= 3.71 IWG total static pressure

Even with these equipment design features, the acous-

tical characteristics of the entire installation must never

be overlooked. Additional steps for the acoustical char-

acteristics of a rooftop installation should be addressed

during the design phase of a project to avoid costly al-

terations after the installation of the equipment. During

the design phase of a project, the designing engineer

should consider, at a minimum, the impact of the equip-

ment location, rooftop installation, building structure,

and duct work.

3. Determine the BHP of the supply fan from Table 6

using the supply air flow and total static pressure.

From the table, we interpolate to get 15.1 BHP. As-

suming a drive loss of 3% and a motor efficiency of

90%, we can calculate the heat rejection of the sup-

ply fan motor as:

(2545 x 15.1)/(0.90 x (1-0.03)) = 44.0 mbh

Required Cooling Capacities:

Total = 600 + 44.0 = 644 mbh

Sensible = 450 + 44.0 = 494 mbh

4. Required total and sensible capacities are 644 mbh

and 494 mbh, respectively. Using the Cooling Per-

formance Data starting with Tables 2, locate the

table with the correct ambient air temperature. Next,

trace the 83°F entering air dry bulb temperature to

match the 17,500 cfm and 67°F entering wet bulb

temperature condition. The resulting conditions are,

from the table, 645 mbh total cooling capacity and

497 mbh sensible cooling capacity. Thus, a 50-ton

unit is selected.

SELECTION PROCEDURE

Given:

Required total cooling capacity of 600 mbh and sen-

sible cooling capacity of 450 mbh with evaporator en-

tering air conditions of 83°F dry bulb and 67°F wet bulb.

Design ambient temperature is 95°F dry bulb. Supply

air requirements are 17500 cfm of air at 2.25 IWG ex-

ternal static pressure. Power supply is 460V/3ph/60Hz

YORK INTERNATIONAL

Cooling Performance Data – 50 Ton Model

TABLE 2 – COOLING PERFORMANCE DATA – 50 TON MODEL

85° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

ENTERING

CFM

WB (°F)

CAP

700

653

640

711

665

654

729

684

680

749

705

710

758

715

SHC

477

548

640

500

581

654

536

634

680

576

695

710

595

715

CAP

700

646

608

708

656

625

721

672

652

736

689

682

742

697

696

SHC

431

500

608

445

523

625

467

558

652

492

597

682

504

616

610

CAP

695

635

590

705

647

606

719

666

632

736

686

661

743

696

674

SHC

387

454

583

399

474

606

418

505

625

439

540

661

449

557

549

CAP

692

637

582

701

647

594

715

663

612

732

680

633

739

689

643

SHC

353

416

562

360

431

547

370

454

550

382

479

582

388

492

486

CAP

691

632

569

699

643

583

712

660

606

726

679

631

732

688

643

SHC

311

377

514

316

388

498

324

406

497

333

425

523

338

435

429

CAP

—

SHC

—

10000

626

574

—

343

455

—

14000

17500

20000

22500

637

585

—

349

439

—

653

603

—

359

438

—

672

622

—

370

467

—

680

631

376

370

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

95° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80

ENTERING

CFM

WB (°F)

CAP

673

628

618

684

642

635

701

665

661

720

691

729

703

704

SHC

468

536

618

491

569

635

526

625

661

565

691

584

703

704

CAP

673

630

590

682

638

607

696

651

634

712

665

663

720

672

675

SHC

416

494

590

432

515

607

458

547

634

486

582

663

500

599

658

CAP

669

615

569

678

627

586

693

645

612

709

665

641

717

674

655

SHC

375

445

513

388

465

541

407

497

587

429

532

641

439

549

629

CAP

667

616

571

676

625

580

690

640

594

705

656

609

712

664

617

SHC

340

404

481

348

419

500

360

443

531

373

470

565

380

483

556

CAP

664

609

562

673

619

572

686

635

588

701

653

606

708

661

614

SHC

301

383

435

306

382

453

315

382

481

325

382

511

329

382

488

CAP

—

SHC

—

10000

605

562

—

331

390

—

14000

17500

20000

22500

615

571

—

338

407

—

630

586

—

348

433

—

647

602

—

360

462

—

655

610

366

447

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

FORM 100.50-EG1

TABLE 2 – COOLING PERFORMANCE DATA – 50 TON MODEL (CONT’D)

105° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80 77

ENTERING

CFM

WB (°F)

CAP

649

590

597

658

609

614

673

638

641

689

670

696

686

684

SHC

464

513

597

483

550

614

512

607

641

545

670

560

695

684

CAP

650

596

573

658

608

589

670

625

614

684

645

642

690

654

655

SHC

409

478

573

424

501

589

447

537

614

472

577

642

485

596

655

CAP

645

589

536

653

600

556

667

618

587

682

638

621

690

647

637

SHC

365

434

498

378

454

527

397

485

571

419

520

621

430

537

644

CAP

644

591

549

651

600

557

663

615

570

677

631

584

683

639

591

SHC

330

390

460

338

406

483

350

432

520

364

461

561

371

475

580

CAP

644

593

544

650

601

553

661

613

567

672

626

582

678

632

590

SHC

290

354

429

295

366

446

303

384

472

311

404

500

315

414

514

CAP

—

SHC

—

10000

589

542

—

318

384

—

14000

17500

20000

22500

597

550

—

326

397

—

609

563

—

337

419

—

623

576

—

350

443

—

629

583

356

455

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

115° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80 77

ENTERING

CFM

WB (°F)

CAP

563

494

498

592

548

550

608

577

578

625

609

633

624

SHC

368

424

498

432

509

550

465

555

578

503

609

520

624

CAP

562

524

501

588

545

533

603

557

550

618

570

568

626

576

577

SHC

318

387

501

370

449

533

397

481

550

427

517

568

441

534

577

CAP

567

514

442

589

541

498

600

555

527

613

571

560

619

579

575

SHC

286

349

424

325

406

488

346

435

522

368

468

560

379

484

578

CAP

558

515

458

585

539

494

600

552

513

616

566

534

623

572

544

SHC

258

313

349

286

359

434

300

383

478

316

410

528

324

423

548

CAP

563

514

467

583

536

491

594

548

504

606

562

518

611

568

525

SHC

233

281

343

246

317

395

253

336

422

261

357

452

265

367

467

CAP

—

SHC

—

10000

518

467

—

254

306

—

14000

17500

20000

22500

537

489

—

276

349

—

547

500

—

288

371

—

558

513

—

301

396

—

563

520

307

408

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

Cooling Performance Data – 55 Ton Model

TABLE 3 – COOLING PERFORMANCE DATA – 55 TON MODEL

85° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

ENTERING

CFM

WB (°F)

CAP

732

677

660

743

693

680

767

728

725

781

750

786

758

760

SHC

488

564

648

512

598

661

564

677

701

592

713

604

720

CAP

704

651

616

712

661

634

731

684

673

741

695

694

746

701

SHC

437

511

616

452

535

634

485

586

673

502

613

510

625

602

CAP

700

641

598

709

653

615

731

680

652

742

694

672

747

701

681

SHC

393

463

598

405

484

587

433

530

652

448

554

454

565

534

CAP

696

642

588

706

652

600

727

675

627

738

688

642

743

693

648

SHC

356

423

564

363

438

531

378

472

572

387

490

390

497

473

CAP

695

637

576

703

649

591

722

673

624

731

687

641

736

692

649

SHC

313

382

515

319

394

481

331

419

515

337

433

340

439

416

CAP

—

SHC

—

12000

631

579

—

346

456

—

16000

19250

22000

24000

642

591

—

353

421

—

666

616

—

367

458

—

679

630

—

375

—

685

636

378

357

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

95° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80

ENTERING

CFM

WB (°F)

CAP

706

651

641

716

668

661

738

707

705

751

728

730

756

737

740

SHC

479

554

626

502

585

644

554

671

682

581

701

703

593

709

CAP

678

634

598

687

643

616

708

661

654

719

671

675

723

675

SHC

424

504

598

441

525

616

478

572

654

497

597

675

506

607

CAP

673

621

577

683

633

594

704

659

633

715

673

653

720

678

662

SHC

381

454

527

394

476

554

422

521

625

438

546

653

444

556

CAP

671

621

575

680

630

585

700

651

605

711

663

616

715

667

620

SHC

344

411

490

352

427

511

369

462

555

379

481

578

383

489

CAP

668

613

567

677

624

577

696

647

600

707

660

613

711

665

618

SHC

303

382

444

309

382

462

322

382

502

328

382

524

331

382

CAP

—

SHC

—

12000

610

566

—

334

398

—

16000

19250

22000

24000

620

576

—

341

415

—

642

598

—

357

453

—

654

609

—

365

473

—

659

614

369

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

FORM 100.50-EG1

TABLE 3 – COOLING PERFORMANCE DATA – 55 TON MODEL (CONT’D)

105° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

ENTERING

CFM

WB (°F)

CAP

642

593

592

661

619

618

701

679

723

711

733

724

725

SHC

473

531

605

493

569

623

535

651

661

558

696

682

567

693

691

CAP

654

602

581

662

613

598

679

639

634

689

653

693

659

661

SHC

416

489

581

432

513

598

465

565

634

483

593

653

490

605

661

CAP

649

594

546

658

606

566

678

632

611

689

645

635

693

651

645

SHC

371

443

512

384

464

542

413

510

606

428

534

641

435

545

656

CAP

647

595

553

655

605

561

673

626

580

682

637

590

686

642

594

SHC

334

397

471

342

415

496

360

452

549

370

473

577

374

481

590

CAP

647

597

549

654

605

558

669

622

578

677

631

588

681

635

593

SHC

292

359

437

297

372

454

308

398

492

314

412

512

317

418

521

CAP

—

SHC

—

12000

593

546

—

322

390

—

16000

19250

22000

24000

601

554

—

330

405

—

619

572

—

346

436

—

628

582

—

355

453

—

632

586

359

460

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

115° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80 77

ENTERING

CFM

WB (°F)

CAP

657

606

598

665

623

617

682

660

659

692

680

682

696

689

692

SHC

460

535

581

482

562

600

529

632

639

554

660

565

668

669

CAP

624

579

557

633

588

572

653

606

602

663

617

616

668

621

622

SHC

400

477

567

417

498

578

455

544

602

476

568

614

484

578

620

CAP

618

571

528

627

582

547

647

605

589

658

617

611

663

622

621

SHC

357

435

517

371

454

539

399

496

587

414

518

613

421

527

624

CAP

613

566

519

623

577

534

645

599

565

657

611

582

662

617

589

SHC

321

390

458

330

406

487

350

440

551

360

458

585

365

466

589

CAP

610

563

517

619

573

528

640

595

552

651

607

565

656

613

570

SHC

284

350

425

288

362

443

297

388

481

302

402

501

304

408

510

CAP

—

SHC

—

12000

559

512

—

312

381

—

16000

19250

22000

24000

570

523

—

319

395

—

592

547

—

335

426

—

603

559

—

343

443

—

608

565

347

450

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

Cooling Performance Data – 60 Ton Model

TABLE 4 – COOLING PERFORMANCE DATA – 60 TON MODEL

85° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

ENTERING

CFM

WB (°F)

CAP

804

736

689

846

795

771

867

824

813

888

854

897

867

873

SHC

495

586

689

609

720

771

666

787

813

722

854

748

867

873

CAP

804

728

663

840

773

740

858

795

779

876

818

817

884

828

835

SHC

461

522

663

538

632

740

576

687

779

614

742

817

632

767

835

CAP

801

729

658

837

771

725

855

792

759

872

814

792

880

823

808

SHC

277

339

442

410

504

617

477

587

705

544

670

792

574

708

817

CAP

798

727

656

833

769

704

851

790

728

868

810

752

876

820

763

SHC

383

440

543

426

519

630

448

558

673

470

598

716

480

616

736

CAP

792

725

647

827

767

700

845

787

726

862

808

752

870

818

764

SHC

344

408

493

372

468

572

386

498

611

401

528

651

407

541

669

CAP

—

SHC

—

14000

723

654

—

377

424

—

18000

21000

24000

27000

761

699

—

415

502

—

780

722

—

434

541

—

799

744

—

453

580

—

808

755

461

598

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

95° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80

ENTERING

CFM

WB (°F)

CAP

773

723

671

814

775

750

834

802

789

854

828

864

840

846

SHC

491

527

671

599

678

750

652

753

789

706

828

730

863

846

CAP

771

692

645

808

752

719

827

783

756

846

813

793

854

827

810

SHC

442

464

645

524

570

719

565

623

756

607

675

793

626

699

810

CAP

769

703

631

804

745

699

822

766

732

840

788

766

848

797

782

SHC

336

397

474

434

529

620

482

594

693

531

660

766

553

691

788

CAP

769

703

642

802

742

684

819

761

706

835

780

727

843

789

737

SHC

368

432

505

414

508

604

438

546

653

461

584

703

471

601

726

CAP

763

699

655

797

736

682

814

755

696

831

774

709

838

782

716

SHC

331

437

416

361

455

550

376

463

616

391

472

683

397

476

714

CAP

—

SHC

—

14000

696

673

—

363

318

—

18000

21000

24000

27000

732

681

—

402

494

—

751

685

—

421

582

—

769

689

—

441

670

—

778

690

450

710

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

FORM 100.50-EG1

TABLE 4 – COOLING PERFORMANCE DATA – 60 TON MODEL (CONT’D)

105° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80 77

ENTERING

CFM

WB (°F)

CAP

753

690

652

782

745

726

797

773

763

811

801

800

818

814

817

SHC

500

469

652

588

635

726

633

718

763

677

801

800

697

839

817

CAP

744

676

627

778

718

697

794

739

732

811

761

767

818

771

783

SHC

438

304

627

514

508

697

551

610

732

589

712

767

606

759

783

CAP

741

672

587

774

713

664

790

734

702

806

754

741

814

764

758

SHC

392

458

554

457

550

648

490

597

694

522

643

741

537

664

759

CAP

741

681

616

771

715

658

787

732

679

802

750

700

809

757

710

SHC

357

416

489

403

494

589

425

533

639

448

572

690

459

589

709

CAP

737

681

632

767

711

655

782

727

667

798

742

679

804

749

684

SHC

319

384

454

347

442

536

361

471

576

375

500

617

382

514

636

CAP

—

SHC

—

14000

678

624

—

350

412

—

18000

21000

24000

27000

708

655

—

389

480

—

723

670

—

409

515

—

738

686

—

428

549

—

744

693

437

565

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

115° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80 77

ENTERING

CFM

WB (°F)

CAP

726

629

626

749

700

699

760

736

735

772

777

788

SHC

485

574

626

572

673

699

615

722

735

658

772

678

788

CAP

711

647

607

742

688

666

758

708

695

774

728

724

781

737

SHC

413

512

622

496

603

673

538

648

698

580

693

724

599

714

735

CAP

702

647

562

736

683

639

754

701

677

771

718

715

779

727

732

SHC

376

447

543

440

537

629

473

582

672

505

627

715

520

647

733

CAP

698

643

561

732

680

625

749

699

657

766

717

690

773

726

704

SHC

345

411

467

389

484

578

411

521

634

433

558

690

443

574

706

CAP

689

635

582

726

673

620

744

692

640

763

711

659

771

719

668

SHC

309

370

447

335

429

524

349

458

563

362

487

602

368

501

619

CAP

—

SHC

—

14000

633

574

—

338

404

—

18000

21000

24000

27000

669

617

—

376

472

—

687

638

—

395

505

—

706

659

—

414

539

—

714

669

423

555

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

Cooling Performance Data – 65 Ton Model

TABLE 5 – COOLING PERFORMANCE DATA – 65 TON MODEL

85° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

ENTERING

CFM

WB (°F)

CAP

840

785

754

853

802

779

876

827

821

899

862

909

878

SHC

584

669

754

615

713

779

668

788

821

721

862

745

878

CAP

839

774

724

851

788

748

871

810

787

892

833

827

901

843

SHC

516

605

724

540

638

748

582

694

787

623

750

827

642

776

765

CAP

836

771

695

848

784

719

868

806

760

888

828

801

898

838

820

SHC

467

554

640

486

582

676

518

630

739

550

678

801

564

700

686

CAP

833

772

710

844

784

723

864

804

745

884

824

767

893

833

777

SHC

418

502

589

431

525

620

454

563

674

477

601

727

488

619

604

CAP

828

768

707

840

780

719

859

800

741

878

820

762

887

829

772

SHC

368

456

542

377

473

568

392

502

612

407

531

656

413

544

530

CAP

—

SHC

—

14000

764

706

—

406

492

—

18000

21000

24000

27000

776

717

—

418

513

—

796

737

—

439

548

—

815

757

—

460

584

—

824

766

469

455

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

95° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80

ENTERING

CFM

WB (°F)

CAP

810

767

733

822

782

756

844

800

797

866

837

875

854

SHC

572

658

733

603

699

756

656

768

797

709

837

733

854

CAP

808

747

704

820

759

726

839

781

764

858

802

867

812

SHC

504

593

704

528

625

726

569

681

764

610

737

802

629

762

753

CAP

806

743

676

817

756

699

836

777

737

855

798

776

863

807

794

SHC

454

542

631

473

570

664

505

618

720

537

665

776

552

687

674

CAP

802

744

686

813

755

697

832

774

717

850

793

737

859

801

746

SHC

405

491

581

419

513

610

442

551

661

464

589

712

475

606

592

CAP

798

740

682

809

751

694

827

770

714

844

788

734

852

797

743

SHC

357

443

530

365

460

556

380

489

600

394

519

644

401

532

518

CAP

—

SHC

—

14000

737

680

—

393

477

—

18000

21000

24000

27000

748

691

—

406

500

—

766

710

—

426

538

—

784

729

—

447

577

—

792

738

456

441

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

FORM 100.50-EG1

TABLE 5 – COOLING PERFORMANCE DATA – 65 TON MODEL (CONT’D)

105° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80 77

ENTERING

CFM

WB (°F)

CAP

780

737

710

792

753

732

812

771

831

809

840

826

SHC

560

646

710

591

683

732

643

746

771

696

809

720

826

CAP

777

717

682

788

730

703

805

752

739

822

774

830

784

791

SHC

493

581

682

516

613

703

555

668

739

595

722

774

613

747

791

CAP

774

714

650

785

726

672

802

746

711

820

766

750

828

775

767

SHC

442

529

621

461

556

650

493

604

700

524

651

750

539

673

772

CAP

771

714

658

781

725

669

798

744

689

816

762

709

823

770

718

SHC

393

476

565

406

499

595

429

538

647

452

576

698

462

594

721

CAP

768

711

655

777

721

666

794

738

685

810

756

704

817

763

712

SHC

342

430

516

351

447

542

365

476

586

379

505

630

386

518

650

CAP

—

SHC

—

14000

708

653

—

381

466

—

18000

21000

24000

27000

718

663

—

393

486

—

734

681

—

413

522

—

751

699

—

433

558

—

759

707

442

574

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

115° AIR ON CONDENSER COIL

CAPACITY (MBH) AT ENTERING DRY BULB (°F)

83 80 77

ENTERING

CFM

WB (°F)

CAP

748

708

681

759

724

704

776

741

794

779

802

796

SHC

548

639

681

578

671

704

629

725

741

680

779

703

796

CAP

744

690

664

754

700

679

771

716

706

789

732

797

740

SHC

478

570

664

502

599

679

543

650

706

584

700

732

603

723

717

CAP

742

686

621

752

696

644

768

714

682

784

732

721

791

740

738

SHC

429

517

608

448

544

634

479

591

678

511

637

721

525

658

648

CAP

738

684

625

748

694

642

766

711

669

784

728

697

792

736

710

SHC

378

463

550

392

486

583

415

523

640

438

561

697

449

578

563

CAP

735

681

628

744

690

638

759

706

655

774

722

672

781

729

680

SHC

330

417

503

338

434

528

352

462

571

366

491

615

372

504

490

CAP

—

SHC

—

14000

678

625

—

368

452

—

18000

21000

24000

27000

687

635

—

380

473

—

703

651

—

400

508

—

718

668

—

419

543

—

725

676

428

414

* Rated performance is at sea level. Cooling capacities are gross cooling capacity.

YORK INTERNATIONAL

Fan Performance

TABLE 6 – 50 THROUGH 65 TON SUPPLY FAN DATA

TOTAL STATIC PRESSURE (inches of water column)

1.00 1.50 2.00 2.50

RPM RPM RPM RPM

CFM

STD. AIR

10000

12000

14000

16000

17500

18000

19250

20000

21000

22000

22500

24000

26000

27000

0.50

RPM

3.00

RPM

1.7

2.5

3.3

––

249

269

290

312

329

334

348

357

370

383

387

398

417

429

321

335

352

371

386

391

404

412

423

434

440

458

478

490

382

392

405

421

435

439

451

458

468

478

484

500

520

533

––

—

2.5

3.4

4.4

443

454

467

478

482

493

499

510

520

524

537

559

572

5.3

493

497

510

519

522

532

538

547

555

560

574

593

602

6.4

––

—

3.6

4.7

5.8

6.9

8.0

540

549

558

561

570

575

583

591

595

607

626

638

9.1

5.1

6.3

7.5

8.7

10.0

11.7

12.3

14.0

15.1

16.7

18.3

19.2

22.1

26.3

28.6

11.2

13.1

13.8

15.5

16.6

18.3

20.0

20.9

23.8

28.3

30.9

6.3

7.7

9.0

10.4

10.9

12.5

13.5

15.1

16.7

17.6

20.2

24.4

26.8

6.8

8.2

9.6

8.1

9.6

11.1

12.1

13.5

15.0

15.8

18.4

22.3

24.6

8.9

10.5

11.9

13.3

14.1

16.6

20.2

22.3

10.1

11.4

12.0

13.9

16.8

18.6

TABLE 6 – 50 THROUGH 65 TON SUPPLY FAN DATA (CONT’D)

TOTAL STATIC PRESSURE (inches of water column)

4.00 4.50 5.00 5.50

RPM RPM RPM RPM

CFM

STD. AIR

10000

12000

14000

16000

17500

18000

19250

20000

21000

22000

22500

24000

26000

27000

3.50

RPM

6.00

––

RPM

––

585

587

595

597

605

609

617

624

628

640

656

665

10.5

12.5

14.5

15.2

17.1

18.2

19.9

21.7

22.7

25.7

30.2

32.7

––

622

629

631

638

642

649

655

659

671

687

693

13.8

15.9

16.6

18.6

19.8

21.6

23.4

24.4

27.5

32.2

34.6

663

664

670

674

681

688

691

700

716

723

15.4

17.3

18.0

20.1

21.4

23.3

25.3

26.3

29.4

34.2

36.8

700

697

696

702

705

710

715

719

729

742

751

17.0

18.8

19.5

21.6

22.9

24.9

26.9

28.0

31.4

36.1

38.9

––

549

732

734

735

740

744

748

759

769

778

15.9

21.2

23.3

24.5

26.6

28.6

29.8

33.4

38.2

41.0

575

766

765

764

769

773

776

783

798

802

17.3

23.0

25.0

26.1

28.2

30.4

31.5

35.1

40.5

43.1

YORK INTERNATIONAL

FORM 100.50-EG1

TABLE 7 – 50 THROUGH 65 TON EXHAUST FAN DATA

TOTAL STATIC PRESSURE (inches of water column)

1.00 1.50 2.00 2.50

RPM RPM RPM RPM

––

CFM

STD. AIR

10000

12000

14000

16000

18000

20000

0.50

RPM

3.00

RPM

–––

6.87

––

674

713

762

819

3.30

4.84

6.84

9.36

801

823

858

4.18

––

5.82 929

7.98 952

9.12 1043 10.32 1132 11.62

904 10.73 988 12.04 1070 13.33 1150 14.69 1229 16.10

879 12.42 957 14.04 1032 15.56 1107 17.02 1179 18.48

943 16.18 1014 18.04 –– –– –– –– –– ––

––

YORK INTERNATIONAL

Fan Performance (continued)

TABLE 8 – COMPONENT STATIC PRESSURE DROPS (INCHES OF WATER COLUMN)

FILTERS

2" 2"

THROW- CLEAN- PLEAT-

EVAPORATOR

COILS

SUPPLY

RETURN AIR

OPENING

AIR FLOW

SIZE

OPENING

CFM STD. AIR

CARBON

WET

DRY

BOTTOM LEFT RIGHT BOTTOM REAR SIDES AWAY

ABLE

10000

12000

14000

16000

17500

18000

20000

21000

22000

22500

12000

14000

16000

18000

19250

20000

22000

24000

14000

16000

18000

20000

21000

22000

24000

26000

27000

14000

16000

18000

20000

21000

22000

24000

26000

27000

0.22

0.30

0.38

0.47

0.54

0.57

0.67

0.72

0.78

0.80

0.30

0.38

0.47

0.57

0.63

0.67

0.78

0.89

0.38

0.47

0.57

0.67

0.72

0.78

0.89

1.01

1.07

0.38

0.47

0.57

0.67

0.72

0.78

0.89

1.01

1.07

0.15

0.21

0.27

0.35

0.41

0.44

0.53

0.58

0.63

0.66

0.21

0.27

0.35

0.44

0.49

0.53

0.63

0.74

0.27

0.35

0.44

0.53

0.58

0.63

0.74

0.86

0.92

0.27

0.35

0.44

0.53

0.58

0.63

0.74

0.86

0.92

0.04

0.06

0.09

0.11

0.14

0.18

0.20

0.21

0.22

0.06

0.09

0.11

0.14

0.16

0.18

0.21

0.25

0.09

0.11

0.14

0.18

0.20

0.21

0.25

0.30

0.32

0.09

0.11

0.14

0.18

0.20

0.21

0.25

0.30

0.32

0.08 0.08

0.11 0.11

0.15 0.15

0.20 0.20

0.24 0.24

0.25 0.25

0.31 0.31

0.35 0.35

0.38 0.38

0.40 0.40

0.11 0.11

0.15 0.15

0.20 0.20

0.25 0.25

0.29 0.29

0.31 0.31

0.38 0.38

0.45 0.45

0.15 0.15

0.20 0.20

0.25 0.25

0.31 0.31

0.35 0.35

0.38 0.38

0.45 0.45

0.53 0.53

0.57 0.57

0.15 0.15

0.20 0.20

0.25 0.25

0.31 0.31

0.35 0.35

0.38 0.38

0.45 0.45

0.53 0.53

0.57 0.57

0.04

0.06

0.08

0.11

0.13

0.17

0.18

0.20

0.21

0.06

0.08

0.11

0.13

0.15

0.17

0.20

0.24

0.08

0.11

0.13

0.17

0.18

0.20

0.24

0.28

0.30

0.08

0.11

0.13

0.17

0.18

0.20

0.24

0.28

0.30

0.06 0.04

0.09 0.06

0.12 0.09

0.15 0.11

0.18 0.14

0.19 0.14

0.24 0.18

0.26 0.20

0.29 0.21

0.30 0.22

0.09 0.06

0.12 0.09

0.15 0.11

0.19 0.14

0.22 0.16

0.24 0.18

0.29 0.21

0.34 0.25

0.12 0.09

0.15 0.11

0.19 0.14

0.24 0.18

0.26 0.20

0.29 0.21

0.34 0.25

0.40 0.30

0.43 0.32

0.12 0.09

0.15 0.11

0.19 0.14

0.24 0.18

0.26 0.20

0.29 0.21

0.34 0.25

0.40 0.30

0.43 0.32

0.05

0.07

0.09

0.11

0.12

0.13

0.15

0.16

0.17

0.07

0.09

0.11

0.13

0.14

0.15

0.17

0.19

0.09

0.11

0.13

0.15

0.16

0.17

0.19

0.21

0.23

0.09

0.11

0.13

0.15

0.16

0.17

0.19

0.21

0.23

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.02

0.03

0.04

0.05

0.06

0.08

0.09

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.11

0.12

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.11

0.12

0.04

0.06

0.07

0.09

0.10

0.12

0.13

0.14

0.15

0.06

0.07

0.09

0.10

0.12

0.14

0.16

0.07

0.09

0.10

0.12

0.13

0.14

0.16

0.19

0.20

0.07

0.09

0.10

0.12

0.13

0.14

0.16

0.19

0.20

0.08

0.11

0.14

0.16

0.19

0.22

0.24

0.26

0.11

0.14

0.16

0.19

0.21

0.22

0.26

0.29

0.14

0.16

0.19

0.22

0.24

0.26

0.29

0.32

0.34

0.14

0.16

0.19

0.22

0.24

0.26

0.29

0.32

0.34

For Aluminum Fins Only

YORK INTERNATIONAL

FORM 100.50-EG1

FILTERS

ECONOMIZER DAMPERS

ECONOMIZER

FRESH AIR

OPENINGS

RIGID FILTER

RACK NO.

MEDIA

POWERED

EXHAUST

12" RIGID

65%*

12" RIGID

95%*

MANUAL OR

0 - 100%

2-POSITION MODULATION

0.05

0.07

0.09

0.11

0.12

0.13

0.15

0.16

0.17

0.07

0.09

0.11

0.13

0.14

0.15

0.17

0.19

0.09

0.11

0.13

0.15

0.16

0.17

0.19

0.21

0.23

0.09

0.11

0.13

0.15

0.16

0.17

0.19

0.21

0.23

0.21

0.28

0.34

0.42

0.47

0.49

0.58

0.62

0.66

0.68

0.28

0.34

0.42

0.49

0.54

0.58

0.66

0.75

0.34

0.42

0.49

0.58

0.62

0.66

0.75

0.84

0.89

0.34

0.42

0.49

0.58

0.62

0.66

0.75

0.84

0.89

0.30

0.38

0.46

0.55

0.62

0.65

0.74

0.79

0.84

0.87

0.38

0.46

0.55

0.65

0.71

0.74

0.84

0.95

0.46

0.55

0.65

0.74

0.79

0.84

0.95

1.06

1.11

0.46

0.55

0.65

0.74

0.79

0.84

0.95

1.06

1.11

0.07

0.11

0.15

0.20

0.24

0.25

0.31

0.35

0.38

0.40

0.11

0.15

0.20

0.25

0.29

0.31

0.38

0.46

0.15

0.20

0.25

0.31

0.35

0.38

0.46

0.55

0.59

0.15

0.20

0.25

0.31

0.35

0.38

0.46

0.55

0.59

0.05

0.08

0.11

0.14

0.17

0.18

0.22

0.24

0.27

0.28

0.08

0.11

0.14

0.18

0.20

0.22

0.27

0.32

0.11

0.14

0.18

0.22

0.24

0.27

0.32

0.37

0.40

0.11

0.14

0.18

0.22

0.24

0.27

0.32

0.37

0.40

0.11

0.16

0.21

0.26

0.31

0.32

0.39

0.42

0.46

0.48

0.16

0.21

0.26

0.32

0.36

0.39

0.46

0.54

0.21

0.26

0.32

0.39

0.42

0.46

0.54

0.62

0.67

0.21

0.26

0.32

0.39

0.42

0.46

0.54

0.62

0.67

0.08

0.11

0.15

0.20

0.24

0.25

0.31

0.34

0.37

0.39

0.11

0.15

0.20

0.25

0.29

0.31

0.37

0.45

0.15

0.20

0.25

0.31

0.34

0.37

0.45

0.52

0.56

0.15

0.20

0.25

0.31

0.34

0.37

0.45

0.52

0.56

YORK INTERNATIONAL

Electrical Data

ELECTRICAL SERVICE SIZING

In order to use the electrical service required for the

cooling only Eco²rooftop, use the appropriate calcula-

tions listed below from U.L. 1995. Based on the operat-

ing mode and configuration of the rooftop, the calcula-

tions will yield different MCA (minimum circuit ampac-

ity), and MOP (maximum overcurrent protection).

• LOAD3 is the current of the electric heaters – zero

for cooling only units.

• LOAD4 is the sum of any remaining currents

greater than or equal to 1.0 amp

Use the following calculations to determine MCA

and MOP for units supplied with a single-point power

connection:

Using the following load definitions and calculations,

determine the correct electrical sizing for your unit. All

concurrent load conditions must be considered in the

calculations, and you must use the highest value for

any combination of loads.

MCA = (1.25 x LOAD1) + LOAD2 + LOAD4

MOP = (2.25 x LOAD1) + LOAD2 + LOAD4

Load Definitions:

If the MOP does not equal a standard current rating of

an overcurrent protective device, then the marked maxi-

mum rating is to be the next lower standard rating. How-

ever, if the device selected for MOP is less than the

MCA, then select the lowest standard maximum fuse

size greater than or equal to the MCA.

• LOAD1 is the current of the largest motor – com-

pressor or fan motor.

• LOAD2 is the sum of the remaining motor currents

that may run concurrently with LOAD1 (i.e., exhaust

fan motor).

TABLE 9 – COMPRESSORS

COMPRESSOR

NOMINAL VOLTAGE

QUANTITY

208V

230V

RLA*

460V

575V

LRA*

PER

MODEL

UNIT

RLA*

54.0

62.3

LRA*

265.0

380.0

LRA*

265.0

380.0

RLA*

24.2

27.9

LRA*

135.0

175.0

RLA*

19.4

22.3

SZ160

SZ185

48.8

56.3

120.0

140.0

* Values shown are per compressor

YORK INTERNATIONAL

FORM 100.50-EG1

TABLE 10 – SUPPLY AND EXHAUST FAN MOTOR (ODP OR TEFC)

High Efficiency Premium Efficiency

NOMINAL VOLTAGE

MOTOR

208V

230V

FLA

13.4

21.6

28.4

39.0

50.0

60.0

76.0

95.6

460V

FLA

6.7

575V

FLA

5.3

MOTOR

208V

FLA

14.9

22.5

29.2

41.5

55.0

71.0

85.5

109.0

230V

FLA

13.6

20.0

25.8

36.0

48.0

61.0

74.0

96.0

460V

FLA

6.8

575V

FLA

5.5

FLA

14.0

22.2

28.5

44.8

61.0

74.0

87.0

113.0

5.0

7.5

10.8

14.2

19.5

25.0

30.0

38.0

47.8

8.2

7.5

10.0

12.9

18.0

24.0

30.5

37.0

48.0

7.9

10.0

15.0

20.0

25.0

30.0

40.0

11.4

16.0

20.0

24.2

30.3

38.0

10.0

15.0

20.0

25.0

30.0

40.0

10.3

14.5

19.3

24.5

30.0

38.0

TABLE 11 – CONDENSER FAN MOTORS / EACH

TABLE 12 – CONTROLS AND CONVENIENCE

OUTLET

NOMINAL VOLTAGE

NOMINAL

208V

FLA

7.5

230V

FLA

6.8

460V

FLA

3.4

575V

FLA

2.7

208V 230V 460V 575V

DESCRIPTION

TONS

AMPS AMPS AMPS AMPS

Control Transformer

Convenience Outlet

3.6

9.6

3.3

8.7

1.6

4.3

3.3

3.5

7.5

6.8

3.4

2.7

7.5

6.8

3.4

2.7

7.5

6.8

3.4

2.7

YORK INTERNATIONAL

Controls

CONTROL SEQUENCES FOR ALL UNITS

GENERAL

ECONOMIZER OPERATION

The control system for the YORK eco²Packaged Roof-

top Unit is fully self-contained and based around an

OptiLogic™ rooftop unit controller. To aid in unit setup,

maintenance, and operation, the OptiLogic™ rooftop

unit controller is equipped with a user interface that is

based around a 4 line x 20 character backlit LCD dis-

play. The LCD displays plain language text in a menu-

driven format to facilitate use. In addition to the display,

the OptiLogic™ user interface is also equipped with an

LED indicator light, which will warn of any abnormal

operation of the equipment or communication failures.

The unit can be equipped with one of three types of

optional economizers, dry bulb, single enthalpy, or com-

parative enthalpy. When the unit controller determines

that Outside Air is suitable for economizing, the unit

controller will control the outside air damper(s) open to

provide economizer cooling. If economizer cooling alone

is insufficient for the cooling load, the unit controller

shall stage up compressors, one at a time, to meet

demand.

The control logic for the three types of economizers is

as follows:

For the maximum in system flexibility, the YORK ECO²

Packaged Rooftop Unit can be operated by either a

typical 7-wire thermostat (2 cool / 2 heat), a space tem-

perature sensor, or stand-alone (VAV only). Note, a field

wiring terminal block is provided to facilitate unit setup

and installation.

Dry Bulb Economizer

The dry bulb economizer is the default economizer con-

trol scheme. With the dry bulb economizer, the unit con-

troller monitors the Outside Air temperature only and

compares it to a reference temperature setting. Outside

Air is deemed suitable for economizing when the Out-

side Air temperature is determined to be less than the

reference temperature setting. This method of econo-

mizing is effective, but is prone to some changeover in-

efficiencies due to the fact that this method is based on

sensible temperatures only and does not take Outside

Air moisture content into consideration.

In lieu of the hard-wired control options, the OptiLogic™

rooftop unit controller can be connected to and oper-

ated by a Building Automation System (BAS). If re-

quired, the OptiLogic™ rooftop unit controller can be

equipped with an optional BACNet IP communication

card, which allows communication, via Ethernet, to a

BACNet IP based BAS.

Single Enthalpy Economizer

UNOCCUPIED / OCCUPIED SWITCHING

With the optional single enthalpy economizer, the unit

controller monitors the Outside Air enthalpy in addition

to the Outside Air temperature and compares it to a

reference enthalpy setting and a reference tempera-

ture setting. Outside Air is deemed suitable for econo-

mizing when the Outside Air enthalpy is determined to

be less than the reference enthalpy setting and the Out-

side Air temperature is less than the reference tem-

perature setting. This method of economizing allows

the reference temperature setting to be set higher than

the DB Economizer and is consequently a more effi-

cient packaged rooftop economizer.

Depending on application, the unit can be indexed be-

tween unoccupied and occupied modes of operation

by one of three methods, hard-wired input, internal time

clock, or BAS. A contact-closure input is provided for

hard-wiring to an external indexing device such as a

central time clock, thermostat with built in scheduling,

or a manual switch. The unit controller is also equipped

with a built in 7-day time clock which can be used, in

lieu of the contact closure input, to switch the unit be-

tween Unoccupied and Occupied modes of operation.

The internal time clock is fully configurable via the user

interface and includes Holiday scheduling. In addition

to the hard-wired input or the internal time clock, the

unit can also be indexed between unoccupied and oc-

cupied modes of operation via a BAS command.

Comparative Enthalpy Economizer

With the optional comparative enthalpy economizer, the

unit controller monitors and compares the Outside Air

and Return Air enthalpies in addition to comparing the

Outside Air temperature to the reference temperature

setting. Outside Air is deemed suitable for economiz-

ing when the Outside Air enthalpy is determined to be

Note a unit operated from a space sensor can be

equipped to temporarily override an unoccupied mode

of operation. This Unoccupied Override feature is fully

configurable via the OptiLogic™ user interface.

YORK INTERNATIONAL

FORM 100.50-EG1

less than the Return Air enthalpy and the Outside Air

temperature is less than the reference temperature set-

ting. This method of economizing is the most accurate

and provides the highest degree of energy efficiency

for a packaged rooftop economizer.

Demand Ventilation

If an optional CO2 sensor is connected to the unit, the

unit controller can reset the minimum OA damper

position(s) or minimum flow rate based on demand.

The unit controller shall monitor the CO2 level within the

building. If the CO2 level rises above the CO2 setpoint,

the controller will temporarily increase the Minimum OA

Damper Position or Minimum OA flow rate to increase

ventilation. If the CO2 level drops below the CO2 set-

point, the controller will decrease the Minimum OA

Damper Position or Minimum OA flow rate to decrease

ventilation.

VENTILATION CONTROL SEQUENCES

Minimum OA Damper Position (CV Units)

When the unit goes into the Occupied mode of opera-

tion, the unit controller shall open the Outside Air

Damper to a fixed minimum position. The damper shall

remain at this position as long as the unit is in the occu-

pied mode. The minimum position may be overridden

more open by the unit controller when Outside Air con-

ditions are suitable for economizing.

Demand Ventilation shall remain active as long as the

unit is in the Occupied mode of operation.

Minimum OA Damper Position (VAV Units)

EXHAUST CONTROL SEQUENCES

Barometric

With Variable Air Volume units, there are two Minimum

OA Damper Positions, one when the unit is at full speed

and the second when the unit is at approximately half

speed. These two points allow the control to linearly

reset the position of the OA damper in response to fan

speed.

The optional barometric exhaust system consists of a

lightweight barometric relief damper installed on the end

of the unit in the Return Air section. As more outside air

is introduced into the controlled zone due to Econo-

mizer and Ventilation control sequences, the pressure

inside the building rises. This increase in building pres-

sure forces the barometric relief damper open to allow

exhaust air to escape. Because this type of exhaust

system is not powered, it is limited to small amounts of

exhaust.

When the unit goes into the Occupied mode of opera-

tion, the unit controller shall monitor the speed of the

supply fan and open the Outside Air damper to a calcu-

lated minimum position based on the fan speed. This

minimum position shall vary as the speed of the fan

changes. The damper shall remain at this calculated

position as long as the unit is in the occupied mode.

The minimum position may be overridden more open

by the unit controller when Outside Air conditions are

suitable for economizing.

Powered Fixed Volume Exhaust Based on

Outside Air Damper Position

This optional fixed volume powered exhaust system

consists of a fixed speed fan that is controlled ON and

OFF based on the position of the Outside Air Damper.

During operation, when the Outside Air Damper opens

to a selected turn-on point, the Exhaust Fan is cycled

ON. The fan remains on as long as the Outside Air

damper is above a selected turn-off point. If the Out-

side Air Damper closes to the selected turn-off point,

the Exhaust Fan is cycled OFF. The turn-on and turn-

off points are user selectable from the OptiLogic™ User

Interface panel.

Air Measurement Stations

When the unit is equipped with an air measurement

station, the unit controller shall control the Outside Air

damper to a measured flow rate through the Air Mea-

surement Station.

When the unit goes into the Occupied mode of opera-

tion, the unit controller shall control the Outside Air

damper to maintain the Minimum AirFlow Setpoint

through the Air Measurement Station. The unit control-

ler shall control the Outside Air damper to this flow rate

as long as the unit is in the Occupied mode. The Out-

side Air damper may be overridden more open by the

unit controller when Outside Air conditions are suitable

for economizing.

Powered Fixed Volume Exhaust Based on

Building Pressure

This optional fixed volume powered exhaust system

consists of a fixed speed fan that is controlled ON and

OFF based on the pressure inside the building. During

YORK INTERNATIONAL

Controls (continued)

operation, the pressure within the building in monitored

by the OptiLogic™ controller. If the pressure rises to or

above a selected turn-on pressure, the Exhaust Fan is

cycled ON. The fan shall remain on as long as the pres-

sure within the building remains above a selected turn-

off pressure. If the building pressure falls to or below

the selected turn-off pressure, the Exhaust Fan is cycled

OFF. The turn-on and turn-off pressure setpoints are

user selectable from the OptiLogic™ User Interface.

For these applications, the unit can be equipped with

optional Low Ambient controls. For optional Low Ambi-

ent operation, the OptiLogic™ controller monitors the

refrigeration system discharge pressure and controls

the speed of the condenser fans. If the discharge pres-

sure falls, the speeds of the condenser fans are re-

duced to maintain acceptable condensing pressures in

the refrigeration system. With the optional Low Ambi-

ent controls, mechanical cooling is allowed down to

Outside Air temperatures of 0°F.

Powered Variable Volume Exhaust-Discharge

Damper Controlled

SMOKE PURGE SEQUENCES

General

This optional variable volume powered exhaust system

consists of a fixed speed fan configured with a propor-

tionally controlled discharge damper. The OptiLogic™

controller monitors the pressure inside the building and

controls the Exhaust Damper and the Exhaust Fan. If

the Building Pressure rises, the Exhaust Damper is pro-

portionally controlled open and the Exhaust Fan is con-

trolled ON. If the Building Pressure falls, the Exhaust

Damper is proportionally controlled closed and the Ex-

haust Fan is controlled OFF. The position of the Ex-

haust Damper in which the Exhaust Fan is controlled

ON and OFF as well as the Building Pressure setpoint

is user selectable from the OptiLogic™ User Interface.

As a convenience, for when buildings catch fire or the

building is inundated with smoke or fumes from manu-

facturing processes, etc., the OptiLogic™ control sys-

tem provides one of five ventilation override control se-

quences for building purge. The five selectable purge

sequences are, Shutdown, Pressurization, Exhaust,

Purge and Purge with duct pressure control. Note, when

any of the purge sequences are activated, cooling and

heating modes are disabled. A contact closure is pro-

vided which indexes the OptiLogic™ controller into the

selected purge sequence.

Powered Variable Volume Exhaust-VFD

Controlled

Shutdown

When this purge sequence is selected and activated,

the supply and exhaust fans are controlled OFF and

the Outside Air damper is overridden closed. This idle

state is maintained until the purge input is deactivated

and the unit returns to normal operation.

This optional variable volume powered exhaust system

consist of an Exhaust Fan driven by a Variable Fre-

quency Drive (VFD), which is controlled by the

OptiLogic™ controller. The OptiLogic™ controller moni-

tors the pressure within the building. As the pressure

rises, the VFD is controlled to increase Exhaust Fan

speed. As the pressure falls, the VFD is controlled to

decrease Exhaust Fan speed. The Building Pressure

Setpoint is user selectable from the OptiLogic™ User

Interface.

Pressurization

When this purge sequence is selected and activated,

the exhaust fan is controlled OFF and the Supply Fan

is controlled ON. The Outside Air damper is opened

full and the Return Air Damper is closed full. If the unit

is a VAV unit, the VAV boxes are also driven full open to

prevent duct over-pressurization. This mode is main-

tained until the smoke purge input is deactivated and

the unit returns to normal operation.

LOW AMBIENT OPERATION

The OptiLogic™ controller continuously monitors the

outside air temperature to determine if mechanical cool-

ing should be allowed. As a safety, if the Outside Air

temperature falls to or below the Low Ambient Lockout

temperature, mechanical cooling is prevented from op-

erating. For units with economizers, the Low Ambient

Lockout temperature is typically low enough that me-

chanical cooling will rarely be required. However, for

some applications mechanical cooling is required when

the Outside Air temperature is lower than the Low Am-

bient Lockout temperature.

Exhaust

When this purge sequence is selected and activated,

the Supply Fan is controlled OFF and the Exhaust Fan

is controlled ON (Exhaust Damper driven full open).

This mode is maintained until the smoke purge input is

deactivated and the unit returns to normal operation.

YORK INTERNATIONAL

FORM 100.50-EG1

Purge

When a Cooling Stage 1 call (“Y1”) is received, and the

unit is equipped with an economizer, the OptiLogic™

controller will check the Outside Air conditions to de-

termine if conditions are suitable for economizing and

modulate the outside air damper and or stage up com-

pressors as required to maintain the VAV High Supply

Air Temperature Setpoint. This setpoint is user select-

able at the OptiLogic™ User Interface. The OptiLogic™

controller will control to this setpoint as long as Cooling

Stage 1 (“Y1”) remains active.

When this purge sequence is selected and activated,

the Supply Fan is controlled ON and the Exhaust Fan

is controlled ON. The Outside Air damper is opened

full and the Return Air damper is closed full. If the unit

is a VAV unit, the VAV boxes are also driven full open to

prevent duct over-pressurization. This mode is main-

tained until the smoke purge input is deactivated and

the unit returns to normal operation.

Purge With Duct Pressure Control (VAV Only)

When a Cooling Stage 2 call (“Y2”) is received, and the

unit is equipped with an economizer, the OptiLogic™

controller will check the Outside Air conditions to de-

termine if conditions are suitable for economizing and

modulate the outside air damper and or stage up com-

pressors as required to maintain the VAV Low Supply

Air Temperature Setpoint. This setpoint is user select-

able at the OptiLogic™ User Interface. The OptiLogic™

controller will control to this setpoint as long as Cooling

Stage 2 (“Y2”) remains active.

When this purge sequence is selected and activated,

the Supply Fan is cycled ON and controlled to maintain

the duct static pressure setpoint. The Exhaust Fan is

also controlled ON (Exhaust Damper driven full open)

and the Outside Air Damper is driven full open. This

mode is maintained until the smoke purge input is de-

activated and the unit returns to normal operation.

VAV SPECIFIC SEQUENCES

Supply fan operation

The VAV High SAT Setpoint is always greater than the

VAV Low SAT Setpoint and because of this essentially

makes this control sequence a Supply Air Tempera-

ture Reset algorithm based on Zone Temperature.

For VAV units, the supply fan is controlled ON and OFF

based on the occupancy state or the G input from a

Thermostat (Unit must be configured for Thermostat

operation to respond to the G input). When the unit

goes into the Occupied mode of operation (or “G” is

called) the Supply Fan will be controlled ON. The

OptiLogic™ controller will monitor the static pressure

within the supply duct system and control the speed of

the supply fan to maintain a specified Duct Static Pres-

sure setpoint. A Variable Frequency Drive (VFD) is used

on all VAV units to vary the speed of the supply fan.

Note, the use of a VFD in lieu of inlet guide vanes pro-

vides for higher energy efficiency for the unit by elimi-

nating the losses (air pressure drop) typical of inlet guide

vane systems.

Zone Sensor Control

When a VAV unit is configured for Zone Sensor opera-

tion, the OptiLogic™ controller will monitor a reference

Zone Temperature and command the Supply Fan to

start when the unit goes into the Occupied mode.

If the zone temperature is above the VAV Setpoint for

SAT Reset, the OptiLogic™ controller will modulate the

outside air damper (Economizer available and condi-

tions suitable) and/or stage compressors up and down,

as required, to maintain the VAV High Supply Air Tem-

perature Setpoint.

If the zone temperature is below or falls below the VAV

Setpoint for SAT Reset, the OptiLogic™ controller will

modulate the Outside Air Damper (Economizer avail-

able and conditions suitable) and/or stage compres-

sors up and down, as required, to maintain the VAV

Low Supply Air Temperature Setpoint.

COOLING OPERATION

Thermostat Control

When a VAV unit is configured for thermostat opera-

tion, the OptiLogic™ controller will command the Sup-

ply Fan to start when the unit goes into the Occupied

mode or a thermostat “G” signal is received by the con-

trol. With no thermostat calls for cooling, the unit shall

remain idle with the Supply Fan operating as required.

As with thermostat operation, this sequence is also a

Supply Air Temperature Reset algorithm based on Zone

Temperature.

YORK INTERNATIONAL

Controls (continued)

Stand Alone Control

SAT setpoint. If conditions are not suitable for econo-

mizing or not equipped with an economizer, the control

will stage up 50% of the compressors. This shall be

maintained until Stage 1 is deactivated or Stage 2 is

called.

If the unit is not configured for Thermostat or Zone Sen-

sor operation, the unit will operate in Stand Alone Mode.

In Stand Alone Mode, the OptiLogic™ Controller will

monitor only the Occupied/Unoccupied state. When the

unit is commanded into the Occupied Mode of opera-

tion, the OptiLogic™ Controller will start the Supply Fan.

If the unit is equipped with an Economizer, the Control-

ler will check to see if Outside Air conditions are suit-

able for Economizing. The controller will then use Out-

side Air (when available and suitable) and/or stage com-

pressors up and down, as required, to maintain the VAV

Low SAT Setpoint.

Stage 2 (“Y2”) Call

If Y2 is called and the unit is equipped with an econo-

mizer, the control will check to see if the Outside Air is

suitable for economizing. If conditions are suitable for

economizing, the control will control the economizer and

stage up compressors, as required, to maintain a LOW

SAT setpoint. If conditions are not suitable for econo-

mizing or not equipped with an economizer, the control

will stage up 100% of the compressors. This shall be

maintained until Stage 2 is deactivated.

CV SPECIFIC SEQUENCES

Zone Sensor Control

Cooling Operation

Thermostat Control

If a zone sensor controls the unit, the OptiLogic™ con-

troller shall maintain all zone temperature setpoints.

These setpoints are user selectable at the OptiLogic™

User Interface.

If a 7-wire thermostat (2 Cool/2Heat) controls the unit,

all zone temperature setpoint control is maintained at

the thermostat. With this operation, the unit remains

idle until it receives a stage call from the Thermostat. If

“G” is called from the thermostat, the Supply Fan will

start and all occupied functions (if equipped), i.e. venti-

lation, economizer, etc. will be allowed to operate.

When a zone sensor is used for control, the OptiLogic™

unit controller will monitor the temperature within the

space and control the unit accordingly. A closed-loop

staging algorithm is used to stage compressors up and

down as required to maintain the desired zone tempera-

ture setpoint. If the unit is equipped with an economizer,

Outside Air conditions are continuously monitored by the

control to determine if conditions are suitable for econo-

mizing. If conditions are suitable for economizing, the

OptiLogic™ controller will modulate the Outside Air

damper in addition to staging compressors up and down

to maintain the zone temperature setpoint.

Stage 1 (“Y1”) Call

If Y1 is called and the unit is equipped with an econo-

mizer, the control will check to see if the Outside Air is

suitable for economizing. If conditions are suitable for

economizing, the control will control the economizer and

stage up compressors, as required, to maintain a high

YORK INTERNATIONAL

FORM 100.50-EG1

Power Wiring

SINGLE-POINT POWER SUPPLY WIRING

Electrical / Controls Box

Power Side

Control Side

TB1

Wiring Terminal

Block

LD06414

Line 1

Line 2

Line 3

Field Power

Supply

Earth

Ground

NOTES:

1. All field wiring must be provided through a field-supplied fused disconnect switch to the unit terminals (or optional molded

disconnect switch).

2. All electrical wiring must be made in accordance with all N.E.C. and/or local code requirements.

3. Minimum Circuit Ampacity (MCA) is based on U.L. Standard 1995, Section 36.14 (N.E.C. Section 440.34).

4. Maximum Dual Element Fuse size is based on U.L. Standard 1995, Section 36.15 (N.E.C. Section 440.22)

5. Use copper conductors only.

6. On units with an optional disconnect switch, the supplied disconnect switch is a “Disconnecting Means” as defined in the N.E.C. Section

100, and is intended for isolating the unit from the available power supply to perform maintenance and troubleshooting. This disconnect

switch is not intended to be a Load Break Device.

FIG. 2 – SINGLE-POINT POWER SUPPLY WIRING

YORK INTERNATIONAL

Power Wiring (continued)

SINGLE-POINT POWER SUPPLY WIRING

WITH NON-FUSED DISCONNECT

Electrical / Controls Box

Power Side

Control Side

Molded

Case

Disconnect

Switch

Wiring Terminal

Block

LD06415

Line 1

Line 2

Line 3

Field Power

Supply

Earth

Ground

NOTES:

1. All field wiring must be provided through a field-supplied fused disconnect switch to the unit terminals (or optional molded

disconnect switch).

2. All electrical wiring must be made in accordance with all N.E.C. and/or local code requirements.

3. Minimum Circuit Ampacity (MCA) is based on U.L. Standard 1995, Section 36.14 (N.E.C. Section 440.34).

4. Maximum Dual Element Fuse size is based on U.L. Standard 1995, Section 36.15 (N.E.C. Section 440.22)

5. Use copper conductors only.

6. On units with an optional disconnect switch, the supplied disconnect switch is a “Disconnecting Means” as defined in the N.E.C. Section

100, and is intended for isolating the unit from the available power supply to perform maintenance and troubleshooting. This disconnect

switch is not intended to be a Load Break Device.

FIG. 3 – SINGLE-POINT POWER SUPPLY WIRING WITH NON-FUSED DISCONNECT

YORK INTERNATIONAL

FORM 100.50-EG1

DUAL-POINT POWER SUPPLY WIRING

Electrical / Controls Box

Power Side

Control Side

TB2

TB1

Wiring Terminal

Block

LD06416

Line 1

Line 2

Line 3

Field Power

Supply #2

Earth

Ground

Line 1

Line 2

Line 3

Field Power

Supply #1

Earth

Ground

NOTES:

1. All field wiring must be provided through a field-supplied fused disconnect switch to the unit terminals (or optional molded

disconnect switch).

2. All electrical wiring must be made in accordance with all N.E.C. and/or local code requirements.

3. Minimum Circuit Ampacity (MCA) is based on U.L. Standard 1995, Section 36.14 (N.E.C. Section 440.34).

4. Maximum Dual Element Fuse size is based on U.L. Standard 1995, Section 36.15 (N.E.C. Section 440.22)

5. Use copper conductors only.

6. On units with an optional disconnect switch, the supplied disconnect switch is a “Disconnecting Means” as defined in the N.E.C. Section

100, and is intended for isolating the unit from the available power supply to perform maintenance and troubleshooting. This disconnect

switch is not intended to be a Load Break Device.

FIG. 4 – DUAL-POINT POWER SUPPLY WIRING

YORK INTERNATIONAL

Field Control Wiring

Wiring Notes:

1. Wiring shown indicates typical wiring.

2. All wiring is Class 2, low voltage.

3. Maximum power available from the 24 VAC

terminal is 40 VA.

4. Use shielded wire where shown.

9 10 11 12

14 15 16 17 18 19 20 21

7 Wire Thermostat

COMMON

R (24VAC)

Y1 (Cool Stage 1)

Y2 (Cool Stage 2)

G (Fan)

Space Sensor

* Use Shielded Wire

1K Nickel

Signal

Common

RTD Sensor

Signal

1.5K Adjust

Common

Potentiometer

CO²Sensor

* Use Shielded Wire

Signal

0-5V Output

Common

Note, 24VAC switch voltage must be

sourced from the unit. Use of another

power source external of the unit may

cause equipment damage.

Closed = Occupied

Open = Unoccupied

Occupied /

Unoccupied Input

Closed = Shutdown

Open = Normal

Shutdown Input

Closed = Smoke Purge

Open = Normal

Smoke Purge Input

24 VAC Signal

VAV Heat

Relay Output

Common

Note: VAV Heat Relay

output shall be used to

command the VAV boxes

to open full.

LD06158

FIG. 5 – FIELD CONTROL WIRING

YORK INTERNATIONAL

GeneralArrangementDrawing

TOP VIEW

SUPPLY OPENING

RETURN OPENING

53"

106-7/16"

40"

5-3/4"

SECTION DESCRIPTIONS

31-7/8"

36-7/8"

35-3/4"

EE = Economizer

FE = Fan Exhaust

MB = Mixing Box

CONTROL PANEL DETAIL

_F = Filter Segment

CC = Cooling Coils

FS = Supply Fan

DP = Discharge Plenum

CO = Condenser Section

CP = Control Panel

I R

10'

72"

FRONT

72"

SIDE

72"

REAR

72"

SIDE

1-1/2" FPT

FRONT VIEW

16-1/16"

REAR VIEW

COUPLING

DRAIN CONN.

179"

SIDE VIEW

(LEFT SIDE)

7-3/16"

24-5/16"

236-1/16"

95-1/4"

(SEE NOTE 6)

344"

92-3/16"

1-9/16"

140-3/4"

379-9/16"

NOTES:

1. 10' CLEARANCE MINIMAL OVER THE TOP OF THE CONDENSING UNIT.

2. ONLY ONE ADJACENT WALL CAN EXCEED UNIT HEIGHT.

3. 12' CLEARANCE REQUIRED TO ADJACENT UNITS.

4. 8' SERVICE ACCESS RECOMMENDED ON ONE SIDE.

5. ECONOMIZER AND EXHAUST HOODS, WHERE APPLICABLE, ARE FOLDED

INSIDE UNIT FOR SHIPMENT.

6. DIM. IS TO OUTSIDE OF LIFTING LUGS

FIG. 6 – GENERAL ARRANGEMENT DRAWING

LD06417

GeneralArrangementDrawing

NOTES:

1. 10' CLEARANCE MINIMAL OVER THE TOP OF THE CONDENSING UNIT.

2. ONLY ONE ADJACENT WALL CAN EXCEED UNIT HEIGHT.

3. 12' CLEARANCE REQUIRED TO ADJACENT UNITS.

4. 8' SERVICE ACCESS RECOMMENDED ON ONE SIDE.

5. ECONOMIZER AND EXHAUST HOODS, WHERE APPLICABLE, ARE FOLDED

INSIDE UNIT FOR SHIPMENT.

TOP VIEW

53"

31-7/8"

36-7/8"

CONTROL PANEL DETAIL

SECTION DESCRIPTIONS

EE = Economizer

FE = Fan Exhaust

MB = Mixing Box

_F = Filter Segment

CC = Cooling Coils

FS = Supply Fan

DP = Discharge Plenum

CO = Condenser Section

CP = Control Panel

SUPPLY

OPENING

RETURN

OPENING

(continued)

FRONT VIEW

16-1/16"

24-5/16"

95-1/4"

(SEE NOTE 6)

117-7/16"

28-1/2"

140-3/4"

REAR VIEW

79-1/8"

SIDE VIEW

(LEFT SIDE)

6-1/2"

LD06418

FIG. 7 – GENERAL ARRANGEMENT DRAWING

CurbLayoutDrawing

87"

RETURN

237"

339"

35-3/4"

71-3/5"

52"

SUPPL

53-3/4"

40"

NOTES:

1. CURB, NAILER & GASKET ONLY, FURNISHED BY YORK. ALL

OTHER PARTS ARE FURNISHED AND INSTALLED "BY OTHERS".

2. ROOF CURB SHIPPED IN PIECES FOR FIELD ASSEMBLY.

3. ROOF CURB MUST BE INSTALLED SQUARE AND LEVEL.

4. CURB MATERIAL IS 14 GAUGE GALVANIZED, NOT PAINTED.

5. CURB INSULATED WITH 1.5"-3# INSULATION.

LD06419

FIG. 8 – CURB LAYOUT DRAWING

Guide Specifications

GENERAL

doors shall be a minimum of 18 gauge on the exterior

surfaces, and 20 gauge on the interior. Interior floor

panels shall be 18 gauge.

Units shall be designed for outdoor rooftop installation

on a roof curb. Units shall be rated according to ARI

360. Units shall be shipped in a single package, fully

charged with HFC-407C refrigerant. The manufactur-

ing facility shall be registered under ISO 9001 Quality

Standards for Manufacturing. All units shall be com-

pletely factory assembled and run tested.

All serviceable sections shall have hinged access doors

with latches on both sides of the unit. All access doors

shall be constructed of 20-gauge steel on the outside,

with 24 gauge on the inside. Each door shall seal against

PVC gaskets to prevent air and water leakage.

Units shall be ETL listed and be tested according to UL

1995. Tags and decals to aid in the service or indicate

caution areas shall be provided. Installation, operation

and maintenance manuals shall be supplied with each

unit.

The roof shall be double wall, with 18 gauge on the

external surface and 24 gauge on the interior. The roof

shall be formed with a 45 degree “drip lip” overhanging

the side walls to prevent precipitation drainage from

streaming down the side of the unit. Roof sections shall

be connected together via integral channels fastened

with screws and sealed with gasketing. Each fastened

seam shall be further protected by a sheet metal chan-

nel covering the full length of the gasket surface, mak-

ing a completely water tight seal.

Units shall be capable of providing mechanical cooling

down to 45° F (0°F with a low ambient kit). Unit shall be

capable of starting and running at 120° F. Unit electric

and gas connections shall be either through the curb or

the side of the unit.

SUPPLY AIR SYSTEM

Supply Air Fan

CONSTRUCTION

Base

Fans shall be centrifugal type, statically and dynami-

cally balanced in the factory. Fan wheels shall be de-

signed for continuous operation at the maximum rate

of fan speed and motor HP. Fans shall be double-width,

double-inlet with forward curved blades.

The base rail shall be constructed of 12 gauge galva-

nized steel, extending the full perimeter of the unit. All

components shall be supported from the base, and the

base shall include integral lifting lugs. The unit base

rail shall overhang the roof curb for water runoff and

shall have a fabricated recess with a continuous flat

surface to seat on the roof curb gasket, providing a

positive, weather tight seal between the unit and the

curb.

The fan and motor assembly shall be mounted on a

common base to allow consistent belt tension with no

relative motion between the fan and motor shafts. The

entire assembly shall be isolated from the unit base

with 1" deflection springs. The fan discharge shall be

connected to the cabinet through a reinforced neoprene

flexible connection to eliminate vibration transmission

from the fan to the unit casing.

Casing

The unit cabinet shall be double wall construction to

provide both maximum resistance to bacterial growth

in the air stream and superior structural integrity. All

sheet metal shall be G90 mill galvanized sheet metal,

formed and reinforced to provide a rigid assembly. Cabi-

net shall be coated with baked on powder paint which,

when subject to ASTM B117, 500 hour, 5% salt spray

test, yields minimum ASTM 1654 rating of “6”. The unit

shall be insulated with 1-1/2,” 1 pound fiberglass insu-

lation between the two sheet metal skins. Insulation shall

meet NFPA-90A regulations for smoke and flame

spread ratings. Single-wall units, or foil-faced insula-

tion in the air stream shall be not acceptable.

BEARINGS AND DRIVES

Bearings shall be self-aligning pillow-block re-greasable

ball bearings with an average life expectancy L10 of

40,000 hours. Grease fittings shall be accessible

through access doors.

Fan motors shall be NEMA designed, Standard effi-

ciency ball bearing type with electrical characteristics

and horsepower as specified. Motors shall be 1750

RPM, open drip proof type. The motor shall be located

within the unit on an adjustable, heavy steel base.

The cabinet corner post and the intermediate side sup-

ports shall be a minimum of 16-gauge steel. All access

YORK INTERNATIONAL

FORM 100.50-EG1

densate drain opening shall be flush with the bottom of

the drain pan to allow complete drainage. Coils in ex-

cess of 48” high shall have an intermediate drain pan,

extending the entire width of the coil to provide better

water drainage.

All fan motor drives shall be selected for a minimum

service factor of 1.2 and have fixed pitched sheaves.

AIR FILTERING SYSTEM

All filter holding frames shall be of heavy-duty construc-

tion designed for industrial applications. All filters shall

be either side accessible via access doors on both sides

of the filter section.

Compressors

Compressors shall be hermetic, scroll-type, including

tip seals to provide efficient axial sealing while prevent-

ing scroll tip to base contact, controlled orbit design for

radial sealing to incorporate minimum flank-to-flank con-

tact for long service life, refrigerant cooled motors, large

suction side free volume and oil sump to provide liquid

handling capability, annular discharge check valve and

reverse vent assembly to provide low pressure drop,

silent shutdown and reverse rotation protection, initial

oil charge, oil level sight glass, vibration isolator mounts

for compressors, and brazed-type connections for fully

hermetic refrigerant circuits.

All filter media shall be Class II listed under UL Stan-

dard 900. Filter efficiencies shall be rated in accordance

with ASHRAE Standard 52-76

Two-inch throwaway filters in an angled filter rack shall

be standard. On units with rigid filters, two-inch prefilters

shall be installed upstream of the rigid filters.

AIR INLET SYSTEM

General

Condenser Coils

Condenser coils shall have 3/8” seamless copper tubes,

arranged in staggered rows, mechanically expanded into

aluminum fins. Coils shall be protected from hail dam-

age with a “V” configuration, with individual flat coils ro-

tated from the vertical plane for each condensing circuit.

A factory installed outside air rain hood permanently

attached to the cabinet to prevent windblown precipita-

tion from entering the unit shall cover inlet openings.

The rain hoods on the sides of the unit shall be rotated

into the cabinet and secured for shipment so that upon

installation they need only be rotated upwards and

screwed into place. The outside air hood shall contain

a removable and cleanable filter.

Condenser Fans and Motors

Condenser fans shall be direct drive, propeller type,

discharging vertically. Condenser fan motors shall be

3-phase, totally enclosed air over (TEAO). Thermal

overload protection shall be provided for each con-

denser fan motor.

All damper assemblies shall be of low leak design.

Damper blades shall be fabricated from a minimum of

16 gauge galvanized steel.

Refrigerant Piping

REFRIGERATION SYSTEM

All interconnecting piping between refrigeration com-

ponents shall be copper tubing with brazed joints.

Units shall have four compressors for maximum load-

matching capability. Each refrigerant circuit shall be

controlled with a thermal expansion valve for maximum

control at low load conditions.

Each refrigerant circuit shall be equipped with liquid line

filter drier, and moisture indicating sight glass. Each

circuit shall also have both high and low pressure

switches installed on either side of the compressor and

include access fittings for replacement of the pressure

switches without removing charge.

Evaporator Coils

Evaporator coils shall be direct expansion. Coil tubes

shall be 3/8” OD copper, with internally enhanced tubes.

Fins shall be enhanced aluminum mechanically ex-

panded to bond with the copper tubes. Coil casing shall

be fabricated from heavy gauge galvanized steel.

Polyurethane sleeves shall protect all small diameter

distributor tubing to the evaporator coil to prevent the

tubes from copper-to-copper contact during shipment

or operation.

A stainless steel double-sloped drain pan shall be pro-

vided under the entire width of the evaporator coil, in-

cluding all return bends. The main drain pan shall be

sloped a total of 1/4” per foot towards the drainage point

according to ASHRAE 62 guidelines. Main drain pan

shall be accessible and cleanable in the field. The con-

POWER SUPPLY

Unit power supply shall be 460V 3-phase 60Hz (208,

230 and 575V optional) single-point power connections

with terminal block connections.

YORK INTERNATIONAL

Guide Specifications (continued)

CONTROLS

ACCESSORIES AND OPTIONS

A factory-mounted unit controller with a 4x20 character

alphanumeric display and user keypad shall be included

as standard. The controller and keypad shall be housed

inside the low-voltage compartment of the control/power

panel. On units with supply or exhaust VFDs, the VFD

keypads shall be located inside the same panel as the

unit controller and interface keypad. Control operating

data, setpoints, unit setup, configuration, service and

history shall all be accessible via a single key. A sys-

tem alarm LED shall indicate failures to the operator

with more detail provide in the menu screens. The user

interface shall function with a simple menu-driven dis-

play for easy access to unit data with integral time clock

for weekly and holiday scheduling. The unit keypad

shall include password protection to prevent unautho-

rized access and tampering with unit setpoints and con-

figuration.

Full perimeter and partial perimeter roof curbs - 14”

high roof curb with wood nailer. Roof curb covers the

entire perimeter of the unit (full curb) or that portion of

the unit that has airflow (partial curb).

Supply Fan VFD Manual Bypass – provides full air-

flow in the event of a VFD failure.

Power Supply Connections – single-point power with

manual disconnect, and dual-point power wiring options

are available for various applications.

Supply air setpoint reset by outside air or space air

temperature - Allows VAV supply air setpoint to float

upward (saving energy) if the outdoor air temperature

or the space temperature is sufficiently low.

A single terminal strip shall be provided for all thermo-

stat and customer hard-wired field connections.

Supply Fan Isolation – the entire supply fan assem-

bly shall be isolated from the unit base with 2" deflec-

tion springs.

Unit controls shall be completely factory packaged and

compatible with a room thermostat. Constant volume

units shall operate with a two (2) cool/two (2) heat ther-

mostat. Staging decisions shall be based upon the de-

viation of space temperature from set point and the rate

of change of the space temperature.

Supply and Exhaust Fan Motors – high efficiency

ODP, and standard and high efficiency TEFC motors

are available all meeting the Energy Policy Act of 1992

(EPACT).

VAV units shall operate with a sensor in the supply air

stream for cooling operation. Staging decisions shall

be based upon the deviation of supply air temperature

from set point and the rate of change of the supply air

temperature.

Low Ambient Operation – a low ambient kit is avail-

able to control compressor head pressure via VFD con-

denser fan speed control. Head pressure control is

accomplished by monitoring head pressure with suc-

tion and discharge line pressure transducers rather than

less accurate temperature control.

Controllers shall have the following safeties (both VAV

and CV):

ECONOMIZERS

• High and low pressure cut-outs (one each refriger-

ant circuit)

• Minimum on time for compressors

Manual Damper Economizer – economizer is avail-

able with a manual damper adjustable between 0-25

percent.

• Delay between compressor stages

• Anti-short cycle delays (minimum off time) for com-

pressors and supply fan

Two-Position Damper Economizer – economizer is

available with a two-position damper with the open po-

sition adjustable between 0-25 percent. The operation

of the two-position economizer shall be based on oc-

cupancy; occupied is open, unoccupied is closed.

• Cooling lockout at 40° F; 0° F if equipped for low

ambient operation

• Air flow proving switch requiring proper air flow for

cooling operation

YORK INTERNATIONAL

FORM 100.50-EG1

Modulating Damper Economizer – economizer is

available with a modulating damper arrangements.

Modulating damper economizers shall have outdoor air

and return air dampers that are interlocked and posi-

tioned by fully modulating, solid state damper actua-

tors. The actuators shall be spring loaded so that the

outside air damper will close when power to the unit is

interrupted. The operation of the modulating economizer

shall be fully integrated into the cooling control system.

The modulating economizer control shall be via a dry

bulb sensor, single or dual enthalpy sensors.

EVAPORATOR COIL PROTECTION

Copper Fins – provided in lieu of aluminum fins.

Pre-Coated Fins – an epoxy-coated aluminum fin stock

to guard from corrosive agents and insulate against gal-

vanic potential. Used for mild seashore or industrial

locations.

CONDENSER COIL PROTECTION

Copper Fins – provided in lieu of aluminum fins.

Airflow Measurement – airflow measurement is avail-

able for the Modulating Damper Economizer option

listed above. Three options exist for airflow measure-

ment; minimum airflow and 100% air flow. Minimum

airflow measures airflow between 0 and the minimum

ventilation airflow up to 25% outside air. 100% airflow

measurement measures air flow from 0-100% of the

outside airflow.

Pre-Coated Fins – an epoxy-coated aluminum fin stock

to guard from corrosive agents and insulate against gal-

vanic potential. Used for mild seashore or industrial

locations.

Post-Coated Fins – Technicoat coil-coating process

used on condenser coils for seashore and other corro-

sive applications (with the exception of strong alkalis,

oxidizers, wet bromide, chlorine and fluorine in concen-

trations greater than 100ppm).

RELIEF SYSTEM

Barometric Relief - building air exhaust shall be ac-

complished through barometric relief dampers installed

in the return air plenum. The dampers will open relative

to the building pressure.

Hot Gas Bypass (Optional on Constant Volume;

Standard on VAV) – permits continuous, stable opera-

tion at capacities below the minimum step of unloading

by introducing an artificial load on the evaporator.

Exhaust Air Fans - two (2) forward curved centrifugal

fans shall be installed in the return air plenum for posi-

tive power exhaust. Fan impellers shall be on a com-

mon shaft, driven by a single motor. The fans, motors

and drives shall be of the same quality and design as

specified for the supply air fan, except the fans shall be

Class I. Exhaust control options are on/off, modulating

discharge damper, or VFD fan speed control. On units

with non-modulating exhaust a barometric relief damper

is included to prevent outside air from entering in the

off cycle. Fans shall cycle on and off with building pres-

sure. On units with modulating exhaust and two posi-

tion control based on building pressure, a field-installed

static pressure sensor mounted in the conditioned

space or return air duct is required for damper and VFD

modulation.

BACNet Communications Card – for BAS commu-

nications, a BACNet card is available with Ethernet

connection.

Compressor Sound Blankets – compressor acoustic

sound blankets for sound sensitive applications.

CO₂Sensors – carbon dioxide sensors for occupied

space that operate demand ventilation control opening

outside air dampers to ventilate building.

Suction and Discharge Pressure Transducers –moni-

tor and readout of suction and discharge pressures.

YORK INTERNATIONAL

NOTES

YORK INTERNATIONAL

FORM 100.50-EG1

NOTES

YORK INTERNATIONAL

Proud Sponsor

of the 2002

U.S. Olympic Team

36USC380

Tele. 800-861-1001

www.york.com

P.O. Box 1592, York, Pennsylvania USA 17405-1592

Subject to change without notice. Printed in USA

Form 100.50-EG1 (201)

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