Trane Precedent YSC060-120 User manual

Packaged Gas/Electric

Rooftop Units

Precedent™

YSC060-120

50 Hz

RT-PRC017-ENFebruary 2004

Introduction

Precedent™ . . . The same Trane

quality... with added flexibility.

Precedent is a flexible line of packaged

units that covers a wide variety of

applications.

Reliatel™microprocessor controls

provide superior flexibility for the

simplest to the most sophisticated

applications. In addition to controls,

Precedent offers many other outstanding

features and option choices.

With its sleek compact cabinet, rounded

corners and beveled top, it may just be

the most aesthetically pleasing

packaged unit on the planet. And, of

course, Precedent carries the Trane

reputation for excellence, quality, and

reliability.

It’s hard to stop a Trane

From simple applications, to the most

complex, Precedent has the solution.

Introduction

Features and Benefits

Application Considerations

Selection Procedure

Model Number Description

General Data

Performance Data

Zone Controls

Electrical Data

Jobsite Connection

Dimensional Data

Weights

Mechanical Specifications

Contents

RT-PRC017-EN

RT-PRC017-EN4

Features and

Benefits

Unit Cabinet

The compact cabinet with rounded

corners takes up less room and is less

costly to ship. The beveled and ribbed

top is not only aesthetically pleasing, it is

designed to prevent water from pooling.

Single Point Power

A single electrical connection powers the

unit.

Compressors

Precedent™contains the best

compressor technology available to

achieve the highest possible

performance. Our compressor line

includes Trane built Climatuff™

reciprocating and scrolls.

Easy Access Panels

Easy access panels reduce the number of

possible water entry points.

Low Ambient Cooling

All Precedent units have cooling

capabilities down to -18°C (0°F) as

standard.

Unit Base

For added water integrity, Precedent has

a raised 29 mm (11/8") lip around the

unit’s downflow supply and return to

prevent water from blowing into the

ductwork.

Sloped Drain Pans

Every Precedent unit has a non-

corrosive, removable, double-sloped

drain pan that’s easy to clean and

reversible to allow installation of drain

trap on either side of the unit.

Through the Base Condensate

Every unit includes provisions for

through the base condensate drain

connections. This allows the drain to be

connected through the roof curb instead

of a roof penetration.

Foil-Faced Insulation

All panels in the Evaporator section of

the unit have cleanable foil-faced

insulation. All edges are either captured

or sealed to ensure no fibers get into the

airstream.

Convertible Units

• The units ship in a downflow

configuration. They can be easily

converted to horizontal by simply

moving two panels.

• Units come complete with horizontal

duct flanges so the contractor doesn’t

have to field fabricate them. These

duct flanges are a time and cost saver.

Easy Access Panels

Remove two screws for access to the

standardized internal components and

wiring.

Easy-Adjust Idler Arm

With the Easy-Adjust Idler Arm, the belt

and sheaves can be quickly adjusted

without moving the mounted fan motor.

The result is a major savings in time and

money. Patented Condenser Coil

Precedent boasts a patented 1+1+1

Hybrid coil, permanently gapped for

easy cleaning.

Colored And Numbered Wiring

You save time and money tracing wires

and diagnosing the unit.

5RT-PRC017-EN

Features and

Benefits

Standardized Components

•Components are placed in the same

location on all Precedent™units.

Familiarize yourself with one Precedent

and you are familiar with every

Precedent.

Easy Access Low Voltage Terminal

Board

Precedent’s Low Voltage Terminal Board

is external to the electrical control

cabinet. It is extremely easy to test

operation of all unit functions. This is

another cost and time saving installation

feature.

Low Voltage Connections

The wiring of the low voltage

connections to the unit and the zone

sensors is as simple as 1-1, 2-2, and 3-3.

This simplified system makes it easy for

the installer to wire.

Single-Side Service

Single-side service is standard on all

Precedent units.

Progressive Tubular Heat Exchanger

The compact cabinet features a tubular

heat exchanger in low, medium and high

heat capacities.

The heat exchanger is fabricated using

stainless steel burners and corrosion-

resistant aluminized steel tubes as

standard on all models. It has an induced

draft blower to pull the gas mixture

through the burner tubes. The heater

has a direct spark ignition system which

doubles as a safety device to prove the

flame.

Flexible Applications

• Only two roof curbs for the 5-10 ton

Precedent line. . .simplifies curb

selection.

•ReliaTel microprocessor controls to

meet either the simple or the more

complex application.

•Low or high gas heat capacities.

• Airflow is outstanding. The Precedent

can replace an older machine with old

ductwork and, in many cases, improve

comfort through better air distribution.

• Belt drive —standard or oversized

supply fan motors meet a wide airflow

range.

• Precedent offers ultimate flexibility.

Options and components are not pre-

packaged at the factory. Units are built

to order in our standard “shortest in

the industry”ship cycle time.

RT-PRC017-EN6

Features and

Benefits

Micro Controls

Several years ago, Trane was the first to

introduce microprocessor controls into

the Light Commercial Market. That

design, along with immeasurable

experience, has provided the technology

for Trane’s second-generation ReliaTel™

microprocessor controls.

ReliaTel Micro:

• Provides unit control for heating,

cooling, and ventilating by utilizing

input from sensors that measure

outdoor and indoor temperature.

• Improves quality and reliability

through the use of time-tested

microprocessor controls and logic.

• Prevents the unit from short cycling,

considerably improving compressor

life.

• Ensures that the compressor will run

for a specific amount of time, which

allows oil to return for better

lubrication, enhancing the reliability of

the compressor.

• Reduces the number of components

required to operate the unit, thereby

reducing possibilities for component

failure.

• Eliminates the need for field-installed

components with its built-in anti-short-

cycle timer, time delay relay and

minimum ‘’on’’ time controls. These

controls are factory tested to assure

proper operation.

• Requires no special tools to run the

Precedent unit through its paces

during testing. Simply place a jumper

between Test 1 and Test 2 terminals on

the Low Voltage Terminal Board and

the unit will walk through its

operational steps. The unit

automatically returns control to the

zone sensor after stepping through the

test mode a single time, even if the

jumper is left on the unit.

• As long as the unit has power and the

LED is lit, the Micro is operational. The

light indicates that the Micro is

functioning properly.

• Features expanded diagnostic

capabilities when used with Trane’s

Integrated Comfort™ Systems.

• As an energy benefit, softens electrical

‘’spikes’’ by staging on fans,

compressors and heaters.

• The Intelligent Fallback or Adaptive

Control is a benefit to the building

occupant. If a component goes astray,

the unit will continue to operate at

predetermined temperature set points.

• Intelligent Anticipation is a standard

feature of the Micro. Functioning

constantly, the Micro and zone sensors

work together in harmony, to provide

tight comfort control.

7RT-PRC017-EN

Features and

Benefits

Factory-installed Options

Hinged Access Doors

These doors permit easy access to the

filter, fan/heat, and compressor/control

sections. They reduce the potential roof

damage from screws or sharp access

door corners.

Economizer

Equipped with either dry bulb, reference

or comparative enthalpy sensing, this

feature provides free cooling as the

outdoor temperature and/or humidity

decreases. Economizers, correctly

installed, offer valuable energy savings.

Factory-installed economizers save time

and ensure proper installation.

Phase Monitor

Phase monitor shall provide 100%

protection for motors and compressors

against problems caused by phase loss,

phase imbalance, and phase reversal.

Phase monitor is equipped with an LED

that provides an ON or FAULT indicator.

Clogged Filter/Fan Fail Switches

These sensors allow a zone sensor

service light or Integrated Comfort

System to indicate a dirty filter or a fan

that’s not working. The field installation

charges for these valuable feedback

devices often eliminate them from

consideration. Factory installation can

make such features a good investment.

COMM3/4 Communication Interface

Available factory or field-installed. This

module, when applied with ReliaTel™,

easily interfaces withTrane’s Integrated

Comfort™ System.

The following options round-out the

complete line of Precedent™ options:

— 0 - 50% Manual or Motorized

Outside Air

— Discharge Air Sensor

— Hail Protection Quality Coil Guards

— Wide array of Zone Sensors and

Thermostats

— Liquid Propane Conversion Kits

— Factory built Roof Curb

One of Our Finest Assets:

Trane Sales Representatives are a

Support group that can assist you with:

— Product

— Application

— Service

— Training

— Special Applications

— Specifications

— Computer Programs and much more

Precedent has the features and benefits

that make it first class in the light

commercial rooftop market. Designed

with input from field contractors and

engineers, its airflow performance is

outstanding.

Precedent…The same Trane

quality…with added flexibility.

RT-PRC017-EN8

Features and

Benefits

VariTrac

WhenTrane’s changeover VAV System

for light commercial applications is

coupled with Precedent, it provides the

latest in technological advances for

comfort management systems and can

allow thermostat control in every zone

served by VariTrac.

• We perform a 100% coil leak test at the

factory. The evaporator and condenser

coils are leak tested at 1375 kPa (200

psig) and pressure tested to 3100 kPa

(450 psig).

• All parts are inspected at the point of

final assembly. Sub-standard parts are

identified and rejected immediately.

• The requirement for cycle testing of

heat exchangers is 10,000 cycles by

ANSI Z21.47. This is the standard

required by both UL and AGA for cycle

test requirments. Trane requires the

design to be tested to 2½ times this

current standard.

• Every unit receives a 100% unit run test

before leaving the production line to

make sure it lives up to rigorousTrane

requirements.

We test designs at our factory not on

our customers!

Quality And Reliability Testing

• All Precedent™designs were rigorously

rain tested at the factory to ensure

water integrity.

• Actual shipping tests were performed

to determine packaging requirements.

Units were test shipped around the

country to determine the best

packaging.

• Factory shake and drop tests were

used as part of the package design

process to help assure that the unit

arrives at the job site in top condition.

• Rigging tests include lifting a unit into

the air and letting it drop one foot,

assuring that the lifting lugs and rails

hold up under stress.

VariTrac ™

9RT-PRC017-EN

Application

Considerations

Heating Operation

The heat exchanger is manufactured

with aluminized steel. To prevent

condensation within the heat exchanger,

do not exceed 50% outside air.

Condensate Trap

The evaporator is a draw-thru

configuration. A trap must be field

provided prior to start-up on the cooling

cycle.

Clearance Requirements

The recommended clearances identified

with unit dimensions should be

maintained to assure adequate service,

maximum capacity and peak operating

efficiency. Actual clearances which

appear inadequate should be reviewed

with the local Trane sales personnel.

Unit Pitch

These units have reversible sloped

condensate drain pans. Units must be

installed level; any unit slope must be

toward side of unit where condensate

drain is connected.

Application of this product should be

within the cataloged airflow and cooling

considerations.

Low Ambient Cooling

The Precedent™line features, as

standard, low ambient cooling down to

-18°C (0°F). Contact your local Trane

Representative for more assistance with

low ambient cooling applications.

Barometric Relief

This product offers an optional

barometric relief damper for use in

conjunction with economizer option.

This option consists of gravity dampers

which open with increased pressure. As

the building air pressure increases, the

pressure in the unit return air section

also increases, opening the dampers and

relieving the conditioned space.

NOTE: THE EFFECTIVENESS OF

BAROMETRIC RELIEF DAMPER DURING

ECONOMIZING OPERATION IS SYSTEM

RELATED. PRESSURE DROP OF THE

RETURN AIR SYSTEM SHOULD BE

CONSIDERED TO CONTROL BUILDING

PRESSURIZATION.

RT-PRC017-EN10

Selection

Procedures - SI Units

Cooling Capacity

Step 1 — Calculate the building’s total

and sensible cooling loads at design

conditions. Use the Trane calculation

form or any other standard accepted

method.

Example: The following are the building

cooling requirements:

a. Electrical Characteristics: 380-415/50/3

b. Summer Design Conditions: Entering

Evaporator Coil: 27° DB/ 19° WB

Outdoor Ambient: 35°

c. Total Cooling Load: 16.5 kW

d. Sensible Cooling Load: 11.8 kW

e. Airflow: 3400 m3/h External Static

Pressure: 125 Pa

f. Downflow Configuration

Step 2 — Size the equipment usingTable

PD-1 to match the cooling loads at

design conditions.

Table PD-1 shows that aYSC060AD has

a gross cooling capacity of 17.8 kW and

14.4 kW sensible capacity at 35 DB

ambient and 3400 m3/h with 27 DB/ 19

WB air entering the evaporator.

Use the following formula to calculate

fan motor heat, which can be found in

the notes in Table PD-8:

Fan motor heat (kW)

= 1.144 x (Fan kW) + 0.132

For example: With 3400 m3/h and 125 Pa,

specified by the engineer, Table PD-8

shows 0.73 kW for a high heat model.

Fan motor heat =

1.144 x 0.73 + 0.132 = 0.97kW

Net Total Cooling =

17.8 kW - 0.97 = 16.8 kW

Net Sensible Cooling Capacity

14.4 kW - 0.97 = 13.4 kW.

Heating Capacity

Step 1 — Calculate the building heating

load using the Trane calculation form or

other standard accepted method.

Step 2 — Size the system heating

capacity to match the calculated

building heating load. The following

are building heating requirements:

a. Total heating load of 17.6 kW

b. 3400 m3/h

c. Fuel - Natural gas

For the YSC060AD there are two

heating capacities available, 19.6 kW

and 29.3 kW input models shown in

Table PD-32. The output capacities of

these furnaces are 15.7 kW and 23.4 kW

respectively.The high heat model with

23.4 kW best matches the building

requirements, indicating a YHC060AD*

should be selected.

Air Delivery Selection

External static pressure drop through

the air distribution system has been

calculated to be 150 Pa. Enter Table PD-

8 for a YSC060AD*H at 3400 m3/h and

150 Pa static pressure. The standard

motor will give the desired airflow.

Accessory Selection

Select accessories needed to

accommodate the application.

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