Trane VPCF, VPWF, VPEF, VSCF, VSWF Catalogue

Product Catalog

VariTrane™ Products

Parallel and Series Fan-Powered

VPCF, VPWF, VPEF, VSCF, VSWF, VSEF,

LPCF, LPWF, LPEF, LSCF, LSWF, LSEF

Variable-Air-Volume (VAV) System

EA

OA

cooling

coil

variable-

speed drive

supply

fan

thermostat

PA

RA

VAV

box

SA

July 2013

VAV-PRC012-EN

Introduction

Fan-powered units offer energy savings due to intermittent fan control.The fan energizes only in
heating mode when the space needs heat. Additional energy savings are obtained by using warm
plenum air forfree reheat. Motor heat is never wasted in parallel units.Theyare an excellent choice
when minimal zone heating is needed.

Figure 1. Parallel fan-powered terminal unit (L) & series fan-powered terminal units (R)

Figure 2. Low height series: LSCF (L) & low height series: LSWF (R)

Figure 3. Low height series: LSEF (L) & low height parallel: LPCF (R)

Figure 4. Low height parallel: LPWF (L) & low height parallel: LPEF (R)

Revision Summary

VAV-PRC012-EN (16 Jul 2013). Updated proportional water valve design.

VAV-PRC012-EN (27 June 2013). Updated controls information. Updated dimensions for units

with attenuators.

Trademarks

Earthwise, VariTrane, VariTrac,Trane and theTrane logo are trademarks of Trane in the United
States and other countries. All trademarks referenced in this document are the trademarks of their
respective owners.

BACnet is a registered trademark of American Society of Heating, Refrigerating and Air­Conditioning Engineers (ASHRAE); LONMARK and LonTalk are registered trademarks of Echelon
Corporation.

© 2013Trane All rights reserved VAV-PRC012-EN

Table of Contents

Features and Benefits ..............................................5

Agency Certifications ..............................................13

Model Number Descriptions ........................................15

Selection Procedure ...............................................17

Performance Data ................................................24

Parallel Fan-Powered Terminal Units .............................. 24

Series Fan-Powered Terminal Units ............................... 35

Low Height Parallel Fan-Powered Terminal Units .................... 47

Low Height Series Fan-Powered Terminal Units ..................... 53

Electrical Data ....................................................59

Parallel Fan-Powered Terminal Units .............................. 59

Series Fan-Powered Terminal Units ............................... 63

Low Height Parallel Fan-Powered Terminal Units .................... 68

Low Height Series Fan-Powered Terminal Units ..................... 70

Acoustics Data ...................................................76

Parallel Fan-Powered Terminal Units .............................. 76

Series Fan-Powered Terminal Units ............................... 85

Low Height Parallel Fan-Powered Terminal Units .................... 92

Low Height Series Fan-Powered Terminal Units ..................... 98

Dimensional Data ................................................103

Parallel Fan-Powered Terminal Units ............................. 103

Series Fan-Powered Terminal Units .............................. 109

Low Height Parallel Fan-Powered Terminal Units ................... 123

Low Height Series Fan-Powered Terminal Units .................... 134

Mechanical Specifications: Fan-Powered ............................142

DDC Controls ...................................................147

Control Logic ................................................. 147

DDC Remote Heat Control Options ............................... 148

Tracer™ UC400 and UC210 Programmable BACnet Controllers ....... 152

Trane DDC VAV Controller Logic ................................. 154

Flow Tracking Control .......................................... 157

Tracer™ Programmable BACnet Controller — Unit Control Module .... 158

Trane LonMark DDC VAV Controller .............................. 160

Trane DDC VAV Controller Logic ................................. 162

VAV-PRC012-EN 3

Flow Tracking Control .......................................... 165

LonMark™ Direct Digital Controller—Unit Control Module ........... 166

Direct Digital Controller—Unit Control Module ..................... 169

Wireless Comm Interface (WCI) .................................. 170

Wireless Receiver/Wireless Zone Sensor .......................... 172

DDC Zone Sensor ............................................. 173

CO

Wall Sensor and Duct CO2Sensor ............................ 174

2

DDC Zone Sensor with LCD ..................................... 176

Zone Occupancy Sensor ........................................ 177

Factory or Field Wired Auxiliary Temperature Sensor ............... 178

Control Relay ................................................. 178

Two-Position Water Valve ...................................... 179

Proportional Water Valve ....................................... 180

Differential Pressure Transducer ................................. 181

Transformers ................................................. 182

Trane Actuator – 90 Second at 60 Hz Drive Time .................... 183

Belimo Actuator – 95 Second Drive Time .......................... 184

Trane Spring Return Actuator ................................... 185

VariTrane DDC Retrofit Kit ...................................... 186

Retrofit Kit Actuator ........................................... 186

Silicon-Controlled Rectifier (SCR) ................................ 187

Pneumatic Controls ............................................ 188

Controls Specifications ......................................... 203

Application Considerations ........................................208

VAV System .................................................. 208

Parallel vs. Series ............................................. 211

Low-Temperature Air .......................................... 213

Energy Savings & System Controls ............................... 216

Control Types ................................................ 218

Flow Measurement and Control ................................. 221

Reheat Options ............................................... 224

Insulation .................................................... 226

Acoustics .................................................... 226

Duct Design .................................................. 230

Best Practices ................................................. 231

Unit Conversions .............................................. 232

Additional VAV System and Product References .................... 233

4 VAV-PRC012-EN

Features and Benefits

VariTrane™– VAV Leadership

VariTrane variable-air-volume (VAV) units lead the industry in quality and reliability and are

designed to meet the specific needs of today’s applications.This generation of VariTrane units
builds upon the history of quality and reliability and expands the products into the most complete

VAV offering in the industry.

Parallel Fan-powered units offer energy savings due to intermittent fan control.The fan
energizes only inheating mode when the space needsheat. Additional energysavings are obtained
by using warm plenum air for free reheat. Motor heat is never wasted in parallel units.They are
an excellent choice when minimal zone heating is needed.

Series fan-powered units have fans which are always energized in occupied mode.They are
common in applications such as conference rooms, cafeterias, etc., that desire constant airflow
rates at all conditions.

Low-height parallel units provide the energy savings of an intermittent fan with the flexibility
of an 11"–11.5” casing height.This is a good choice for tight plenum spaces.

Low-height series units have been used for years in projects with strict plenum height
requirements. Units
are available in 11.0" height.

Energy Efficient Earthwise™ Systems

Figure 5. Rooftop VAV (office building)

A significant consumer of energy in commercial buildings is heating and air conditioning. One of
the most energy-efficient HVAC solutions is theVAV system.This inherent system efficiency, along
with high-quality, affordable DDC controls, has steadily increased demand forVAV systems over
the years. VAV systems save significant energy, are able to deliver the required amount of
ventilation air, and provide reliable occupant comfort.

Energy saving featuresmust go beyond a simple VAV unit to incorporate VAV unit level and system
level control strategies like:

• Ventilation Optimization-Combines demand-controlled ventilation (using either a time-of-day
schedule, an occupancy sensor, or a carbon dioxide sensor) at the zone level with ventilation
reset at the system level to deliver the required amount of outdoor air to each zone, while
minimizing costly over-ventilation.

VAV-PRC012-EN 5

Features and Benefits

S
Q
s
r

y
u

g

l

• Fan Pressure Optimization- reduces supply fan energy by as much as 40% by intelligently

• Night setback reduces energy consumption during unoccupied periods by raising or lowering

• Supply AirTemperature Reset-reduces overall system energy use (balancing reduced cooling

• Electrically Commutated Motors (ECM) improve the efficiency of fan-powered VAV units.

• LowTemperatureAir Distribution can decrease overall system energy use by reducing airflows

To determine the potential energy savings a VAV system can bring to your applications,Trane

offers energy-modeling software like System Analyzer™ andTRACE 700
introduced into the HVAC industry in 1972, the HVAC design and analysis program was the first of
its kind and quickly became a defacto industry standard. It continues to grow with the industry
meeting requirements for ASHRAE Standard 140, ASHRAE 90.1, and the LEED® Green Building
Rating System and has now been approved by the IRS to certify energy savings for building
owners. Contact your localTrane Sales Engineer for additional information.

reducing the pressure in the air distribution system to the lowest possible level without
impacting occupant comfort.

space temperature setpoints.

and reheat energy with increasedfan energy)by raising thesupply airtemperature at part load,
while avoiding elevated space humidity levels.

and the fan energy needed to move that air through the system.

®

. WhenTRACE™ was

Control Flexibility—Trane
factory installs more VAV
controllers than any other
manufacturer in the
industry. In addition to
Trane DDC controls and
simple factory-mounting
of non-Trane VAV controllers,
Trane now offers a LonMark™
controller that is completely
factory-commissioned to
maximize installation quality
and system reliability. Labor
savings are maximized with
Trane factory-commissioned
controllers.

Service Friendly:
* Internal shaft visible
through control box
cover sight hole for
blade orientation
verification.
* Same-side NEC jumpback clearance—
provides all high- and low-voltage
components on the same side
to minimize field labor.
* SQ fan-powered units have
improved accessability to
internal components. Sliding
panels are standard which
improve safety and allow
servicing with a single
technician.

Accurate Flow Ring—Housed
and recessed within the air
valve to provide flow ring
handling/shipping protection.
The patented flow ring provides
unmatched airflow measurement
accuracy.

Optional Narrow Corridor unit
configuration — designed to minimize building
material expenses by squeezing more into less space.
Meets all NEC jumpback clearance requirements
for these extra-tight areas. Narrow Corridor
Configuration not pictured here. Refer to Series
Fan-Powered dimensional data for reference drawings.

Rugged Air Valve—Trane air
valves are heavy gage steel
with a continuously welded
seam to limit inlet deformation.
This provides consistent and
repeatable airflow across
the flow ring with performance you
can count on.

Full Range of Insulation—Whether seeking optimal acoustical perf
or cleanability, Trane has a complete line of insulation options, inc
double-wall, matte-faced, foil-faced, closed cell, etc.

Technologically Advanced "
Units— New super-quiet (S
fan/motor/wheel assemblie
engineered as an air delive
system to provide the most
efficient design available in
industry. For quiet comfort
can trust, rely on Trane SQ

Tough Interlocking Panels— Ru
and rigidity are assured with Tra
patent-pending interlocking pan

Superior Metal Encapsulated
VariTrane Units are complete
encapsulated edges to arrest
fibers and prevent erosion in

6 VAV-PRC012-EN

Construction

Features and Benefits

UL-listed products—

Safety and reliability are vital in commercial construction. AllVariTrane units are completely listed
in accordance with UL -1995 as terminal units.This listing includes the VAV terminal with electric
heaters. Additionally, all insulation materials pass UL 25/50 smoke and flame safety standards.

AHRI Certified Performance—

All VariTrane units are AHRI certified. AHRI 880 guarantees the pressure drop, flow performance,
and acoustical performance provided is reliable and has been tested in accordance with industry
accepted standards. AHRI 885 uses AHRI 880 performance and applies accepted industry methods
to estimate expected “NC” sound levels within the occupied space.

Casing Design—

Interlocking Panels—VariTrane products are manufactured in the most state-of-the-art VAV facility
in the world.The patent-pending interlocking panels are designed using integral I-beam
construction technology.This limits deformation and creates tremendous product rigidity. An
additional benefit is a smooth unit exterior with few exposed screws—ideal for exposed ceiling
applications. VariTrane units are designed for use in systems that operate up to 5" w.c. of inlet
pressure.

Metal Encapsulated Edges—AllVariTrane unitsare complete
with encapsulated edges to arrest cut fibers and prevent
insulation erosion into the airstream.This is the standard of
care in applications concerned with fiberglass erosion or
projects with either double-wall or externally wrapped duct
work.

TheTrane Air Valve—is at the heart of VariTrane terminal
units.This is where airflow is measured and controlled.
Repeatability and ruggedness is vital.VariTrane products are
the most rugged and reliable available.

18-gage Cylinder—limits deformation or damage during shipment and job site handling, and
provides even airflow distribution across the flow ring for unmatched airflow measurement
accuracy.

Continuously Welded Seam — an automated weld process creates the highest quality continuous
seam, which is “right” every time.The welded seam improves air valve rigidity and creates
consistent and repeatable airflow across the flow measurement device.The result is a truly round
cylinder every time, with no flat spots caused by lower quality crimping and riviting technologies.

Flow Ring—TheTrane flow ring is time tested to perform under the
most demanding conditions. Additionally,Trane’s patented flow ring
is recessed within the air valve cylinder to reduce the potential for
damage during job site handling and installation.

VAV-PRC012-EN 7

Features and Benefits

External Shaft—The simple design provides controller flexibility and is designed to facilitate
actuator field replacement.

Position Indicator—The position indicator shows current air valve position to aid in system
commissioning. Many times this can be seen from the floor without climbing a ladder.

ExternalActuator—This feature increases serviceability,control system compatibility,and actuator
clutch access for simplified commissioning.

Indoor Air Quality (IAQ) Features

The oil embargo ofthe early1970s created an energy crisis,which resulted in tighter buildings,and

reduced ventilation rates. A fallout issue of tighter building construction was poor indoor air
quality.This heightened IAQ awareness. IAQ issues have been featured in publications from the
smallest towns to the largest cities. System design should consider applicable ventilation and IAQ
standards.(See your localTrane Sales Engineer or visit
Good indoor air quality results from units and systems which:

• Provide the required amount of ventilation air to each zone during all operating conditions

• Limit particulates from entering occupied spaces

• Allow proper access for periodic cleaning.

www.trane.com for additional information).

Note: Access made easy on new VariTrane units, as shown on this Series Fan-Powered unit.

VariTrane units are designed with simplified access and a full line of insulation options including:

Matte-faced—Typical industry standard with reduced first cost.

Closed-cell—This insulation has anR-value andperformance equivalent to matte-faced insulation.

The main difference is the reduction of water vapor transmission. Closed-cell is designed for use

in installations with a high chance of waterformation. (It has been usedto coat the exterior of chiller
evaporator barrels for many years.)

Foil-faced—A fiberglass insulation with a thin aluminum coating on the air stream side to prevent
fibers frombecoming airborne.The aluminum lining is acceptable for many applications, however
it is not as rugged as double-wall

Double-wall—Premium insulation often used in many health care applications with insulation
locked between metal liners.This eliminates the possibility for insulation entering the airstream
and allows for unit interior wipe-down as needed.

VariTrane VAV units are the most prepared IAQ units in the industry.

The end result is areliable product designed for peak performance, regardless of jobsite conditions

or handling.

8 VAV-PRC012-EN

Tracer™ Building Automation System

Tracer Building Automation System assures comfort within your building. Building controls have

a bigger job descriptionthan theydid afew years ago. It’s no longer enough tocontrol heatingand
cooling systems and equipment. Sophisticated buildings require smarter technology that will
carry into the future. Tracer™ controls provide the technology platform – mobile, easy-to-use,
cloud-based, scalable and open - for the next generation of data-driven, technology-enabled
services that are creating high performance buildings. With aTraneTracer Building Automation
System, you’ll:

• Reduce operating costs through energy management strategies

• Consistently provide occupant comfort

• Enjoy reliable operation with standard, pre-engineered and pretested applications

• Easily troubleshoot and monitor either on site or from a remote location

• Reduce installation time and simplify troubleshooting

Whether factory-mounted or field-installed,Trane offers a wide range of controllers to suit virtually

any application.These unitsare compatible witha variety of building typesand can be usedfor new
construction or renovation.Through extensive usability testing internally and with building
operators, we’ve designed our controls for real world ease of use.

(Additional control options and sequence-of-operations are located in the “Controls” section.)

Trane VAV UCM DDC Controller

Features and Benefits

DDC (communicating electronic)—DDC
controllers are today’s industrystandard. DDC
controllers provide system-level data used to
optimize overall SYSTEM performance.

Variables such as occupied/unoccupied,

minimum and maximum cfm and
temperature, valve position, ventilation
fraction, etc. are available on a simple twisted­shielded wire pair. For additional information,
see “Industry Issues: Energy Efficiency”.

Note: One of many Trane DDC Control Options which are factory-installed, wired, calibrated, and fully tested before shipment.

Trane DDC controllers provideTrane-designed solid-state electronics intended specifically forVAV

temperature control in space comfort applications. DDC control capabilities include:

• Pressure-independent (PI) operation—Provides airflow required by the room thermostat to
maintain occupant comfort.The controller automatically adjusts valve position to maintain
required airflow. Minimum and maximum airflow is factory-set and field-adjustable.

• Factory-set airflow and temperature setpoints

• Most advanced system integration in the industry.

Tracer VV550 LonTalk™ Controllers

LonTalk™ Controller

Trane now offers a full line of LonTalk™
controllers designed for simple integration
into ANY system which can communicate via
the LonMark Space Comfort Control (SCC)
protocol.These controllers are also
completely factory-commissioned.

VAV-PRC012-EN 9

Features and Benefits

Tracer BACnet™ Controllers

Trane now offers a full line of BACnet controllers designed for simple integration into any system

which can communicate via the BACnet protocol.These controllers are factory-commissioned and
shipped ready to be installed.

UC210 BACnet Controller

Trane Wireless Comm Interface (WCI)

WCI controller

Provides wireless communication between theTracer SC,

Tracer Unit Controllers, and BACnet™ Communication

Interface (BCI) modules.

TheTrane WCI is the perfect alternative to Trane’s BACnet

wired communication links (for example – Comm links
between aTracer SC andTracer UC400).

Eliminating communication wire used between terminal
products, zone sensors, and system controllers has substantial
benefits.

• Installation time and associated risks are reduced.

• Projects are completed with fewer disruptions.

• Future re-configurations, expansions, and upgrades are
easier and more cost effective.

UC400 BACnet Controller

Trane Wireless Zone Sensor

Wireless Zone Sensor

Provides wireless communication between theUnit Controller
and the zone sensor.This is an alterntive to the wired zone
sensor when access and routing of communicaiton cable is an
issue. It also allows very flexible mounting and relocation of
zone sensors

10 VAV-PRC012-EN

Pneumatic Controller

Pneumatic Controller

Binary Input Controller

Features and Benefits

Pneumatic—Pneumatic controllers provide

proven reliability and performance. A full line
of options provide:

• Highest quality PVR available, which
maximizes zone temperature control.

Pressure-independent operation

• AllVariTrane pneumatic controllers use the
patented flow sensor input to provide the
most accurate performance available.

Integration Options (Interfacing with other control systems) - Trane offers three ways to
interface with other control systems.

1. UseTrane LonMark, factory-commissioned VAV controllers

2. UseTrane Binary Input Controller (BIC). BIC allows system control through binary logic.This
means that a control system on an existing campus, or those seeking “Analog non­communicating control” can control aTrane DDCVAV unit viabasic binarycontact closures, like
relays, etc.This can be a cost effective interface option where a fullTrane DDC VAV System is
not available.

3. UseTrane BACnet™ factory-commissioned VAV controllers.

Factory-installed vs. Factory-commissioned:

The terms factory-installedand factory-commissioned are often used interchangeably.Trane takes

great pride in being the industry leader in factory-commissioned DDC controllers. Table
differentiates these concepts.

Factory-commissioned controllers provide thehighest quality and most reliable units for your VAV
system. Additional testing verifies proper unit operation including occupied/unoccupied airflow,
temperature setpoints, communication link functionality, and output device functionality.The
benefits of factory-commissioning are standard on VariTrane terminal units withTrane DDC
controls.This means that factory-commissioned quality on VariTrane VAV units is now available
on ANY manufacturer’s control system that can communicate using the LonMark Space Comfort
Control (SCC) protocol. (See Controls section for complete listing of variables which are
communicated.

Table 1. Factory-installed vs. factory-commissioned

Factory-installed Factory-commissioned

Transformer installed (option) X X

Wires terminated in reliable/consistent setting X X

Controller mounted XX

Electric heat contactors and fan relay wired X X

VAV-PRC012-EN 11

Features and Benefits

Table 1. Factory-installed vs. factory-commissioned

Factory-installed Factory-commissioned

Testing of electric heat contactors and fan relay X

Controller addressing and associated testing X

Minimum & Maximum airflows settings (occupied/unoccupied) X

Minimum & Maximum temperature setpoints (occupied/unoccupied) X

Minimum ventilation requirements X

Thumbwheel enable/disable X

Heating offset X

Wireless communications modules (WCI) X X

Wireless zone sensor X

Indoor Air Quality Management During Construction

LEED wrap option is a pressure sensitive
covering that prevents contamination of the

VAV box during the construction phase. It is

utilized to seal all openings without
constraining the installation process.

Trane VAV Systems - Proven Performance

Trane is the industry leader in VAV systems, including factory-commissioned controls and

integration with other control systems.This leadership began with customers seeking the most
reliable VAV products in the industry.The solution was factory-commissioned controls (see
Factory-installed vs. Factory-commissioned). Since then, it has blossomed to include optimized
system control strategies.

Control strategies are often made more complicated than necessary. VariTrane DDC controls
simplify control strategies by pre-engineeringcontrol logic and sequencinginto the controller.This
information is available via a twisted-shielded wire pair, and accessible via aTraneTracer™ SC
building automation system. Data is easily accessed via a computer workstation.

Optimized system control strategies, such as ventilation optimization, fan-pressure optimization,
and optimal start/stop, are pre-engineered in VariTrane™ unit-level DDC controllers and theTracer
SC building automation system.

This allows aTrane VAV system to meet or exceed the latest ASHRAE 90.1 Energy Efficiency

standards. Pre-engineered controls allow consistent, high quality installations which are very
repeatable.The end result is PROVEN control strategies you can rely on to perform. For more
information on these and other control strategies, contact your localTrane Sales Office, or visit
www.trane.com.

PurchasingVAV controllers and VAV hardware from a single manufacturer provides a single
contact for all HVAC system related questions.

12 VAV-PRC012-EN

Agency Certifications

There are numerous regulationsand standardsin theindustry thatdetermine theconstruction and

performance parameters for VAV terminal units. Some of the more important of those standards
and regulations are listed below, along with a brief description of what each one addresses.

American Society of Heating, Refrigerating and Air-conditioning Engineers

(ASHRAE) - 41.1

ASHRAE - 41.2

ASHRAE - 41.3

These standards specify methods for temperature measurement (41.1), laboratory airflow

measurement (41.2), and pressure measurement (41.3).While none of these standards specifically
discusses VAV air terminals, they discuss topics that are aspects of terminal box systems.

Therefore, some engineers will include these standards in their specifications as a primer on

accepted measurement techniques.

ASHRAE - 62

This standard specifies theminimum ventilationrates andindoor air qualitythat areacceptable for

occupied spaces.

ASHRAE - 111

This standard calls out procedures to be followed for testing and balancing HVAC systems. It

includes descriptions of the equipment used, procedures followed, and field changes that must be
made when a system is balanced.

Air-Conditioning, Heating and Refrigeration Institute (AHRI)

AHRI 880

This standard sets forth classifications, performance testing requirements, and test results

reporting requirements for air terminal units.The standard contains very detailed procedures that
are to be followed for the testing and certification program associated with this standard.This is
one of the most commonly referenced standards in the VAV terminal unit industry.The AHRI-880
certification program is designed to police the accuracy of documented performance for terminal
units.The certification program requires a sampling of at least four units be tested annually.The
tested units are chosen at random by AHRI and sent to an independent laboratory for the testing.

The performance is tested at one specific operating condition.The operating characteristics tested

include discharge and radiated sound power (for the damper and, in the case of fan-powered
boxes, the fan), wide-open damper pressure drop, and fan motor amp draw. VariTrane terminal

units are certified according to AHRI-880.

AHRI 885

This document provides a procedure to estimate sound pressure levels in an occupied space.The

standard accounts for the amount of sound pressure in the space due to the VAV air terminal,
diffusers and their connecting low pressure ductwork. While sound generated from the central
system fan andductwork may be a significant factor in determining thesound pressure level in the
room, this standarddoes not address those factors. It focusessolely onthe VAVterminal and items
downstream of it.This standard is related to AHRI-880 by using sound power determined using
AHRI-880 methodology as a starting point for the AHRI-885 procedure.

Underwriter’s Laboratory (UL) 1995

Underwriter’s Laboratory is an independent testing agency that examines products and
determines if those products meet safety requirements. Equipment manufacturers strive to meet
UL guidelines and obtain listing and classifications for their products because customers recognize
UL approval as a measure of a safely designed product. VariTrane VAV air terminals are listed
per UL-1995, Heating and Cooling Equipment.The terminals are listed as an entire assembly.

VAV-PRC012-EN 13

Agency Certifications

National Fire Protection Association

NFPA 70

This standard is also known as the National Electrical Code (NEC).The Code gives standards for

installation of wiring and electrical equipment for most types of commercial and residential
buildings. It is often referred to inVAV air terminal specifications when fan-powered boxes, electric
heat or electric controls are included.

NFPA 90A

This standard does not speak directly to VAV air terminals but does discuss central system

considerations pertaining to a fire and/or smoke condition.The standard discusses safety
requirements in design and construction that should be followed to keep the air-handling system
from spreading a fire or smoke.The standard specifies practices that are intended to stop fire and
smoke from spreading through a duct system, keep the fire-resistive properties of certain building
structures (fire walls, etc.) intact, and minimize fire ignition sources and combustible materials.

14 VAV-PRC012-EN

Model Number Descriptions

Digit 1, 2—Unit Type

VP = VariTrane™ Fan-Powered Parallel
VS = VariTrane Fan-Powered Series

LP = VariTrane Fan-Powered

Low-Height Parallel

LS = VariTrane Fan-Powered

Low-Height Series

Digit 3—Reheat

C = Cooling Only
E = Electric Heat

W = Hot Water Heat

Digit 4—Development Sequence

F = Sixth

Digit 5, 6—Primary Air Valve

05 = 5" inlet (350 max cfm)
06 = 6" inlet (500 max cfm)
08 = 8" inlet (900 max cfm)
10 = 10" inlet (1400 max cfm)
12 = 12" inlet (2000 max cfm)
14 = 14" inlet (3000 max cfm)
16 = 16" inlet (4000 max cfm)
RT = 8" x 14" inlet (1800 max CFM)

Note: 10, 12, 14, 16 Not Available on Low-

Height

Digit 7, 8—Secondary Air Valve

00 = N/A

Digit 9—Fan

P = 02SQ fan (500 nominal cfm)
Q = 03SQ fan (1100 nominal cfm)
R = 04SQ fan (1350 nominal cfm)
S = 05SQ fan (1550 nominal cfm)

T = 06SQ fan (1850 nominal cfm)

U = 07SQ fan (2000 nominal cfm)
V = 08SQ Fan (500 nominal cfm)
W = 09SQ Fan (900 nominal cfm)

X = 10SQ Fan (1800 nominal cfm)

Digit 10, 11—Design Sequence

** = Factory assigned

Digit 12, 13, 14, 15—Controls

DD01= Cooling Only Control

DD02= N.C. On/Off Hot Water

DD03= Prop. Hot Water

DD04= Staged On/Off E-Heat

DD05= Pulse Width Mod of E-Heat

DD07= N.O. On/Off Hot Water

DD11= VV550 DDC Controller - Cooling

Only

DD12= VV550 DDC Ctrl w/N.C. On/Off

HW Valve

DD13= VV550 DDC Ctrl w/Prop. HW

Valve

DD14= VV550 DDC Ctrl - On/Off

Electric Heat

DD15= VV550 DDC Ctrl w/Pulse Width

Modulation

DD17= VV550 DDC Ctrl w/N.O. On/Off

HW Valve

DD23= VV550 DDC- Basic plus- Local

(Electric heat- PWM) Remote
(Staged EH)

DD28= VV550 DDC-Basic plus- Local

(Water heat- N.O. 2-position)
Remote (Water- N.O. 2-position)

DD29= VV550 DDC-Basic plus- Local

(Water heat- N.C. 2-position)
Remote (Water- N.C. 2-position)

DD30= VV550 DDC-Basic plus- Local

(Water heat- N.O. 2-position)
Remote (Water- N.C. 2-position)

DD31= VV550 DDC-Basic plus- Local

(Water heat- N.C. 2-position)
Remote (Water- N.O. 2-position)

DD32= VV550 DDC-Basic plus- Local

(Electric heat- Staged) Remote
(Staged EH)

DD41= UC400 DDC-Basic (No water or

electric heat)

DD42= UC400 DDC-Basic (Water heat-

Normally Closed- 2 position)

DD43= UC400 DDC-Basic (Water heat-

Modulating)

DD44= UC400 DDC-Basic (Electric heat-

staged)

DD45= UC400 DDC-Basic (Electric heat-

PWM)

DD47= UC400 DDC-Basic (Water heat-

Normally Opened- 2 position)

DD53= UC400 DDC-Basic plus- Local

(Electric heat- PWM) Remote
(Staged EH)

DD58= UC400 DDC-Basic plus- Local

(Water heat- N.O. 2-position)
Remote (Water- N.O. 2-position)

DD59= UC400 DDC-Basic plus- Local

(Water heat- N.C. 2-position)
Remote (Water- N.C. 2-position)

DD60= UC400 DDC-Basic plus- Local

(Water heat- N.O. 2-position)
Remote (Water- N.C. 2-position)

DD61= UC400 DDC-Basic plus- Local

(Water heat- N.C. 2-position)
Remote (Water- N.O. 2-position)

DD62= UC400 DDC-Basic plus- Local

(Electric heat- Staged) Remote
(Staged EH)

DD65= Basic (Electric Heat- Modulating

SCR)

DD66= Basic plus – Local (Electric heat –

Modulating SCR) Remote
(Staged EH)

DD71= UC210 DDC-Basic

(Cooling only)

DD72= UC210 DDC-Basic

(Water heat-nc 2pos)

DD73= UC210 DDC-Basic

(Water heat-Modulating)

DD74= UC210 DDC-Basic

(Electric heat-staged)
DD75= UC210 DDC-Basic
(Electric heat-pwm)

DD77= UC210 DDC-Basic

(Water heat-NO 2pos)
DD83= UC210 DDC-Basic+ Local

(Electric heat-pwm)

Remote (Staged)

DD84= UC210 DDC-Basic+ Local

(Water heat Modulating)
Remote (Water-NC 2pos)

DD85= UC210 DDC-Basic+ Local

(Water heat Modulating)
Remote (Water-NO 2pos)

DD86= UC210 DDC-Basic+ Local

(Water heat NO 2pos)

Remote (Water-Modulating)

DD87= UC210 DDC-Basic+ Local

(Water heat NC 2pos)
Remote (Water-Modulating)

DD88= UC210 DDC-Basic+ Local

(Water heat NO 2pos)
Remote (Water-NO 2pos)

DD89= UC210 DDC-Basic+ Local

(Water heat NC 2pos)
Remote (Water-NC 2pos)

DD90= UC210 DDC-Basic+ Local

(Water heat NO 2pos)
Remote (Water-NC 2pos)

DD91= UC210 DDC-Basic+ Local

(Water heat NC 2pos)
Remote (Water-NO 2pos)

DD92= UC210 DDC-Basic+ Local

(Electric heat-staged)
Remote (Staged)

DD95= UC210 DDC-Ctrl w/Modulating

SCR

DD96= UC210 DDC-SpaceTemp Ctrl w/

Local SCR & Remote Stge Elec

Heat
DD00= Trane Actuator Only
ENCL= Shaft Only in Enclosure
ENON= Shaft Out Side for Electric Units
FM00= Other Actuator and Control
FM01= Trane supplied actuator,

other control
PN00= N.O. Actuator and Linkage Only
PN05= N.O. 3000 Series, RA Stat
PN51= Pneumatic normally open

w/3011,DPS fan
PN52= Pneumatic normally open

w/3011, DPM fan
PNON= Shaft Out Side for Pneumatic

Units
N.C. = Normally-closed
N.O. = Normally-opened
DA Stat = Direct-acting pneumatic t-stat

(by others)

RA Stat = Reverse-acting pneumatic

t-stat (by others)
PN = Pneumatic
FM = Factory installation of customer-

supplied controller
PVR = Pneumatic Volume Regulator

Digit 16—Insulation

A = 1/2” Matte-faced
B = 1" Matte-faced
D = 1" Foil-faced
F = 1" Double-wall
G = 3/8” Closed-cell

Digit 17—MotorType

D = PSC Motor
E = High-efficiency motor (ECM)

VAV-PRC012-EN 15

Model Number Descriptions

Digit 18—Motor Voltage

1 = 115/60/1
2 = 277/60/1
3 = 347/60/1
4 = 208/60/1
5 = 230/50/1

Digit 19—Outlet Connection

1 = Flanged
2 = Slip & Drive

Digit 20—Attenuator

0 = No Attenuator

W = With Attenuator

Digit 21—Water Coil

0 = None
1 = 1-Row–Plenum inlet installed RH
2 = 2-Row–Plenum inlet installed RH
3 = 1-Row–Discharge installed, LH
4 = 1-Row–Discharge installed, RH
5 = 2-Row–Discharge installed, LH
6 = 2-Row–Discharge installed, RH1

A = 1-Row–Premium water coil inlet

B = 2-Row–Premium water coil inlet
C = 1-Row–Premium hot coil

on discharge, LH

D = 1-Row–Premium hot coil

on discharge, RH

E = 2-Row–Premium hot coil

on discharge, LH

F = 2-Row–Premium hot coil

on discharge, RH

Note: 1- and 2-row not available with

Low-Height

Digit 22—Electrical Connections

L = Left (Airflow hitting you in the

face)

R = Right (Airflow hitting you in the

face)

W = Narrow Corridor LH, Hi-Volt Inlet

Facing

X = Narrow Corridor RH, Hi-Volt Inlet

Facing

Note: (W & X) Fan Powered Series Only

Digit 23—Transformer

0 = N/A (provided as standard)

Digit 24—Disconnect Switch

0 = None

W = With

Electric Reheat w/ door interlocking
power disconnect, Cooling Only and

Water Reheat w/ toggle disconnect

Digit 25—Power Fuse

0 = None

W = With

Digit 26—Electric Heat Voltage

0 = None
A = 208/60/1
B = 208/60/3
C = 240/60/1
D = 277/60/1
E = 480/60/1
F = 480/60/3
G = 347/60/1
H = 575/60/3
J = 380/50/3
K = 120/60/1

Note: K not available with Low Height

Digit 27, 28, 29—Electric Heat
kW

000 = None
050 = 0.5 kW
010 = 1.0 kW
015 = 1.5 kW
260 = 26.0 kW

Note: Electric Heat Voltage -

0.5 to 8.0 kW–½ kW increments

8.0 to 18.0 kW –1 kW increments

18.0 to 46.0 kW–2 kW increments

Digit 30—Electric Heat Stages

0 = None
1 = 1 Stage
2 = 2 Stages Equal
3 = 3 Stages Equal

Note: 3 not available with Low Height

Digit 31—Contactors

0 = None
1 = 24-volt magnetic
2 = 24-volt mercury
3 = PE with magnetic
4 = PE with mercury
5 = SCR heat UC400
6 = SCR heat FMTD/ENCL/DD00

Note: SCR cannot be selected with the

following configuration:

• KW > 10, 208 volt 3 phase, Low

Height

• KW > 22, 480 volt 3 phase, Low

Height

• Voltage = 575 volt

Digit 32—Airflow Switch

0 = None
W = With

Digit 33—Not Used

0 = N/A

Digit 34—Actuator

0 = Standard
A = Belimo actuator

Digit 35—Wireless Sensors

0 = None
1 = Factory Mounted Wireless

Receiver (Sensor Assembly)

2 = Wireless Comm Interface

Modular FM

Note: All sensors selected in accessories

Digit 36—Pre-Wired Factory
Solutions

0 = None
1 = Factory Mounted DTS
2 = HW Valve Harness
3 = Both DTS & HW Valve Harness

16 VAV-PRC012-EN

Selection Procedure

This section describes elements and process required to properly select fan-powered VAV

terminals, and includes a specificexamples. Selection procedure is iterativein naturewhich makes
computer selection desirable. Selection of fan-powered VAV terminals involves four elements:

• Air valve selection

• Heating coil selection

• Fan size and selection

• Acoustics
Note: Use the same procedures for selecting Low-Height Fan-Powered Units.

Air Valve Selection

Provided in the Performance Data—Air Pressure Requirements section of the catalog is the unit air
pressure drop at varying airflows.To select an air valve, determine the airflow required at design
cooling. Next, select an air valve diameter that will allow proper airflow modulation, (a velocity of
1600 – 2000 FPM is recommended). Keep in mind that modulation below 300 FPM is not
recommended. Proper selection requires defining the minimum valve airflow (in either heating
or cooling) and maintaining at least 300 FPM through the air valve.The minimum is typically set
based on ventilation requirements. If zone ventilation does not come through the VAV unit, a
minimum valve position can also be zero.

Heating Coil Selection

Supply Air Temperature

The first step required when selecting a heating coil is to determine the heating supply air

temperature to the space, calculated using the heat transfer equation. A recommended value is
90°F, although values between 85°F and 95°F are common. Discharge air temperatures that exceed
20 degrees above space temperature are not recommended for proper diffuser operation. Air
temperature difference is defined as the heating supply air temperature to the space minus the
winter room design temperature.The zone design heat loss rate is denoted by the letter Q. Supply
air temperature to the space equals the leaving air temperature (LAT) for the terminal unit.

Coil Leaving Air Temperature

Once the terminal unit LAT is determined, the heating requirements for the coil can be calculated.

The leaving air temperature for the coil of a parallel fan-powered terminal unit varies based on the

type of unit installed heat being selected. Series unit leaving air temperatures do not vary because
in each case the coil is located on the unit discharge.

Electric coil LAT equals terminal unitLATbecause the coil is located on the unit discharge.Hot water
coils can be located on either the discharge or, for maximum system efficiency, the plenum inlet
when located on the entering air side of the fan. Coil LAT is calculated using a mixing equation.
Given the unitheating airflow and LAT, minimum primary airflow atits supplyair temperature,and
the volume of heated plenum air, the leaving air temperature for the hot water coil can be
determined (see the unit selection example that follows for more details).

Coil Entering Air Temperature

The entering air temperature (EAT) to the coil also varies based on the coil position on the unit for

parallel units.The unit heat is mounted on the discharge of a series unit.Therefore the EAT equals
the temperature of blended primary and plenum air.

Parallel electric coils are mounted on the unit discharge. Hot water coils can be mounted on the
discharge or on the plenum inlet. Plenum inlet mounting creates a more efficientVAV system.This
is because the parallel fan is energized only when in heating mode, and thus, when in cooling
mode, the water coil is not in the airstream.

The EAT for discharge mounted coils equals the temperature of blended primary air and plenum

air. For plenum inlet mounted water coils, the EAT equals the plenum air temperature.

VAV-PRC012-EN 17

Selection Procedure

Capacity Requirement

Once both coil EAT and LAT are determined, the heat transfer (Q) for the coil must be calculated
using the heat transfer equation. For electric heat units, the Q value must be converted from Btu
to kW for heater selection.The required kW should be compared to availability charts in the
performance data section for the unit selected. For hot water heat units, reference the capacity
charts in the performance data section for the required heat transfer Q and airflow to pick the
appropriate coil.

Fan Size and Selection

Fan Airflow

Fan airflow is determined by calculating thedifference between the unitdesign heating airflowand
minimum primary airflow.

Fan External Static Pressure

Fan external static pressure is the total resistance experienced by the fan, which may include
downstream ductwork and diffusers, heating coils, and sound attenuators. As total airflow varies
so will static pressure, making calculation of external static pressure dependent on unit type.

In many applications of parallel terminals,a minimumprimary airflow mustbe maintainedto meet
ventilation requirements.This primary airflow contributes to the total resistance experienced by
the fan and should be accounted for in all components downstream of the fan itself, including
electric coils. Hot water coils positioned on the fan inlet are not affected by the additional primary
airflow.The static pressure resistance experienced by the fan due to the hot water coil is based on
fan airflow only, not the total heating airflow.

With series fan-powered terminal units, all airflowpasses through the fan. External static pressure

requirements are the sum of the individual component pressure retirements at the design airflow
of the unit.

Acoustics

Fan Motor Type

The fan motor type that will be used for the unit will need to be known before fan selection can

begin.The ECM motor offers more efficient operation than the standard single-speed PSC motor
and will use different fan curves. Because series fans operate in both heating and cooling mode,
payback is typically 2–3 years for the premium ECM option. Refer to the Features and Benefits
section to determine which motor is more appropriate for the unit

Selection

Once fan airflow and external static pressure are determined, reference the fan curves in the
performance data section. Cross plot both airflow and external static pressure on each applicable
graph. A selection between the minimum and maximum airflow ranges for the fan is required.

It is common to identify more than one fan that can meet the design requirements.Typically,
selection begins with the smallest fan available to meet capacity. If this selection does not meet
acoustical requirements, upsizing the fan andoperating it at aslower speed can be donefor quieter
operation.

Air Valve Generated Noise

To determine the noise generated by the air valve, two pieces of information are required; design

airflow and design air pressure drop.The design air pressure drop is determined by taking the
difference between design inlet and static pressure (the valve’s most over-pressurized condition)
and external static pressure at design cooling flow.This represents a worst-case operating
condition for the valve.

18 VAV-PRC012-EN

Fan Generated Noise

To determine fan noise levels, fan airflow, external static pressure and speed information is

required.

Evaluation Elements

For parallel fan-powered terminal units, the air valve and fan operation must be evaluated
separately because these operations are not simultaneous. For Series fan-powered units, the air
valve and fan are evaluated together because they have simultaneous operation. Access the
appropriate acoustics table(s)of the catalog and determine the sound power and NC predictionfor
both the discharge and radiated paths. It is important to understand that discharge air noise is
generally not a concern with fan-powered terminals. Radiated noise from the unit casing typically
dictates the noise level of the space. If the entire unit or any element of it is generating noise in
excess of the NoiseCriteria requirements, thesize of theappropriate portion of theterminal should
be increased. Because the selection procedure is iterative, care should be taken by the designer to
confirm that the change in selection does not affect other elements of the unit or system design.

Selection Example—ParallelWith Hot Water Heat

Air Valve Selection

Design Cooling Airflow:1000 cfm
Minimum Ventilation Airflow: 200 cfm
Maximum Unit APD: 0.25 in. wg
Choose 10" air valve
Check – Is minimum airflow above 300 FPM? Guidelines, FPP 8)
A 10" air valve is selected with unit pressure drop = 0.01 in. wg

Selection Procedure

Heating Coil Selection

Required Information:
Zone design heat loss: 20000 Btu
Unit heating airflow: 600 cfm

Winter room design temp.: 68ºF

Coil entering water temp.: 180ºF
Minimum primary airflow: 200 cfm
Fan Airflow: 400 cfm
Plenum temperature: 70ºF
Coil flow rate: 2 gpm
Primary air temperature: 55ºF

Heat Transfer Equation (Btu)

Q = 1.085 x Cfm x DTemperature

For the heating zone, the temperature difference is the zone supply air temperature (SAT) minus
the winter room design temperature.

18000 Btu = 1.085 x 600 x (SAT - 68ºF)
SAT = 95.6ºF

Because the designer chose to maximize system efficiency by having the hot water coil on the
plenum inlet, the unit supply air temperature is equal to the mix of the heated plenum air from the
fan and the minimum primary airflow.

600 cfm x 95.6ºF =
200 cfm x 55ºF +
(600 cfm - 200 cfm) x Coil LAT

Coil LAT = 116ºF

VAV-PRC012-EN 19

Selection Procedure

For the heating coil, the temperature difference is the calculated coil LAT minus the coil EAT
(Plenum AirTemperature).
CoilQ=1.085 x 400 x (116-70) = 19,964 Btu = 19.96 Mbh

Coil Performance Table

Selection:
Size 02SQ fan, 1-row coil with 2 gpm =20.53 Mbh (at 400 cfm)

1-row coil with 2 gpm = 2.57 ftWPD

Fan Selection

Required Information:

Design airflow: 400 cfm
Downstream static pressure at design airflow: 0.25 in. wg

Fan external static pressure equals downstream static pressure (ductwork and diffusers) plus coil
static pressure.The coil static pressure that the fan experiences is at the fan airflow (400 cfm).The
downstream static pressure the fan experiences is at fan airflow plus minimum primary airflow.

The sum of fan airflow and minimum primary airflow (600 cfm) is less than design airflow (1000

cfm) and therefore the 0.25 in. wg downstream static pressure at design airflow must be adjusted
for the lower heating airflow.

Parallel Fan-Powered Unit with Water Coil (2 Options)

Plenum Inlet Mounted

Using Fan LawTwo:

Heating Downstream Static Pressure = (600/1000)2 x 0.25 = .09 in. wg

A size 02SQ fan has the capability to deliver approximately 650 cfm at 0.09 downstream static
pressure. If an attenuator is required, use the attenuator air pressure drop tables to define
additional fan static pressure.

Acoustics

Required Information:

Design inlet static press.: 1.0 in. wg
NC criteria: NC-35

The selection is a VPWF Parallel Fan-poweredTerminal Unit, 10" primary, parallel fan size 02SQ,

with a 1-row hot water coil.

Determine the casing radiated noise level because it typically dictates the sound level (NC) of the
space. With a parallel unit, two operating conditions must be considered, design cooling and
design heating.

Discharge Mounted

20 VAV-PRC012-EN

Selection Procedure

Design Cooling (1000 cfm). Radiated valve typically sets the NC for parallel units incooling mode.

The closest tabulated condition (1100 cfm at 1.0 in. wg ISP) has an NC=31. (A more accurate

selection can be done viaTOPSS electronic selection program.):

Table 2. Selection Program Output (Radiated Valve):

Octave Band 2 3 4 5 6 7 NC

Sound Power 65 60 53 48 41 32 30

Design Heating (200 cfm valve, 400 cfm fan, 0.25 in. wg DSP). Radiated fan typically sets the NC
for parallel units in heating mode.The closest cataloged condition (430 fan cfm , 0.25 in. wg DSP)
has an NC=32. (A more accurate selection can be done viaTOPSS electronic selection program.)

Table 3. Selection Program Output (Radiated Fan):

Octave Band 2 3 4 5 6 7 NC

Sound Power 66 58 56 52 48 41 31

The predicted NC level for design cooling is NC-30 and for design heating is NC-31. If the catalog

path attenuation assumptions are acceptable, this unit meets all of the design requirements and
the selection process is complete.

Computer Selection

The advent of personal computers has served to automate many processes that were previously

repetitive and time-consuming. One of those tasks is the proper scheduling, sizing, and selection
of VAV terminal units.Trane has developed a computer program to perform these tasks.The
software is called theTrane Official Product Selection System (TOPSS).

TheTOPSS program will take the input specifications and output the properly sizedVariTrane VAV

terminal unit along with the specific performance for that size unit.

The program has several required fields, denoted by red shading in theTOPSS screen, and many

other optional fields to meet the criteria you have. Required values include maximum and
minimum airflows, control type, and model. If selecting models with reheat, you will be required
to enter information to make that selection also.The user is given the option to look at all the
information for one selection on one screen or as a schedule with the other VAV units on the job.

The user can select single-duct, dual-duct, and fan-poweredVAV boxes with the program, as well

as most otherTrane products, allowing you to select all yourTrane equipment with one software
program.

The program will also calculate sound power datafor the selected terminal unit.The usercan enter

a maximum individual sound level for each octave bandor a maximum NC value.The program will
calculate acoustical data subject to default or user supplied sound attenuation data.

Schedule View

The program has many time-saving features such as:

• Copy/Paste from spreadsheets like Microsoft® Excel

• Easily arranged fields to match your schedule

• Time-saving templates to store default settings

The user can also export the Schedule View to Excel to modify and put into a CAD drawing as a

schedule.

Specific details regarding the program, its operation, and how to obtain a copy of it are available
from your localTrane sales office.

VAV-PRC012-EN 21

Selection Procedure

Selection Example—Series With Hot Water Heat and ECM

Air Valve Selection

Required Information: Design cooling airflow: 1000 cfm

Minimum ventilation airflow: 200 cfm
Maximum unit APD: 0.40 in. wg

A 10" air valve is selected.

Check–is minimum airflow above 300 FPM?

Answer–Yes. Minimum cfm allowable = 165 cfm. (See
General Data—Valve/Controller Guidelines pp FPS 8).

The 03SQ fan will be used in this instance. By interpolating,

you can choose a 10" air valve with wide-open air pressure
drop of 0.32 in. wg.

Heating Coil Selection

Required Information: Zone design heat loss: 30000 Btu

Design heating airflow: 1000 cfm

Winter room design temp.: 68ºF

Coil entering water temp.: 180ºF
Minimum primary airflow: 200 cfm
Plenum temperature: 70ºF
Primary air temperature: 55ºF
Coil flow rate: 2 gpm
HeatTransfer Equation (Btu)Q=1.085 x Cfm x  Temperature

For the heating zone, the temperature difference is the zone supply air temperature (SAT) minus
the winter room design temperature.

30000 Btu = 1.085 x 1000 x (SAT-68°F)
SAT = 96ºF

Because the hot water coil is on the unit discharge of a series fan-powered unit, the unit supply air
temperature is equal to the coil LAT. Coil entering air temperature (EAT) is a mix of plenum air and
the minimum primary airflow.

1000 cfm x Coil EAT = 200 cfm x 55ºF + (1000 cfm - 200 cfm) x 70ºF

Coil EAT = 67ºF

For the heating coil, the temperature difference is the calculated coil LAT minus the coil EAT
(Plenum AirTemperature).

Coil Q =1.085 x 1000 x (96-70) = 31,465 Btu

On a series unitthe hot water coilis locatedon thedischarge, so the totalheating airflow, 1000 cfm,
passes through the coil.

Coil Performance Table

Selection:
Performance:
Size 03SQ fan, 1-row coil at 2 gpm = 32.23 MBh
1-row Coil at 2 gpm= 0.83 ftWPD

Fan Selection

Required Information. Fan airflow: 1000 cfm

Downstream static pressure at design airflow: 0.25 in. wg

A size 03SQ fan can operateat upto 1150 cfm (1-row coil) or 1100 (2-row coil) and 0.25" downstream
static pressure. Inlet and coil selections should be verified withTOPSS electronic selections.

22 VAV-PRC012-EN

Selection Procedure

If an attenuator is required, use attenuator air pressure drop tables to define additional fan static
pressure.

Acoustics

Required Information. Design inlet static press: 0.75 in. wg

NC criteria (general office space): NC-40

The selection is aVSWF Series Fan-PoweredTerminal Unit, 10" primary, series fan size 03SQ, with

a 1-row hot water coil.

Determine the casing radiated noise level because it typically dictates the sound level
(NC) of the space. With a series unit, the air valve and fan operate simultaneously, so the chart

for air valve and fan sound data must be consulted.

The results in the below table are for the acoustics value of a size 10" air valve with a size 03SQ fan.

The predicted NC level for design conditions is NC-38.

Octave Band 2 3 4 5 6 7 NC

Sound Power 70 65 63 61 59 59 38

Note: Ensure water coil acoustical impact is considered. For this example, the appurtenance effect

adds one (1) NC to fan-only radiated sound. Because this does not set NC for this selection,
it can be overlooked.The addition of an attenuator (see same appurtenance effect tables
reduces the NC four (4) points, resulting in a final selection NC = 30 (if required).

Note: Do not overlook the water coil impact on acoustics. A good rule of thumb is that it will add

1 to 2 NC to “fan only” radiated sound for most applications.

Computer Selection

The advent of personal computers has served to automate many processes that were previously

repetitive and time-consuming. One of those tasks is the proper scheduling, sizing, and selection
of VAV terminal units.Trane has developed a computer program to perform these tasks.The
software is called theTrane Official Product Selection System (TOPSS).

TheTOPSS program will take the input specifications and output the properly sizedVariTrane VAV

terminal unit along with the specific performance for that size unit.

The program has several required fields, denoted by red shading in theTOPSS screen, and many

other optional fields to meet the criteria you have. Required values include maximum and
minimum airflows, control type, and model. If selecting models with reheat, you will be required
to enter information to make that selection also.The user is given the option to look at all the
information for one selection on one screen or as a schedule with the other VAV units on the job.

User can select single-duct, dual-duct, and fan-powered VAV boxes with the program, as well as
most otherTrane products, allowing selection of allTrane equipment with one software program.

The program will also calculate sound power datafor the selected terminal unit.The usercan enter

a maximum individual sound level for each octave bandor a maximum NC value.The program will
calculate acoustical data subject to default or user supplied sound attenuation data.

Schedule View

The program has many time-saving features such as:

• Copy/Paste from spreadsheets like Microsoft® Excel

• Easily arranged fields to match your schedule

• Time-saving templates to store default settings
User can also export Schedule View to Excel to modify and put into a CAD drawing as a schedule.

Specific details regarding program, its operation, and how to obtain a copy of it are available from
your localTrane sales office.

VAV-PRC012-EN 23

Performance Data

Parallel Fan-PoweredTerminal Units

Table 4. Primary airflow control factory setting-I-P

Control Type

Direct Digital
Control/ UCM

Pneumatic with

Volume

Regulator

Note: Maximum airflow must be greater than or equal to minimum airflow.

Size (in.)

5
6
8

10
12
14
16

5
6
8

10
12
14
16

Table 5. Primary airflow control factory settings – SI

Air Valve

Control Type

Direct Digital
Control/ UCM

Pneumatic with

Volume

Regulator

Note: Maximum airflow must be greater than or equal to minimum airflow.

Air Valve
Size (in.)

5
6
8

10
12
14
16

5
6
8

10
12
14
16

Maximum

Valve Cfm

350
500
900

1400
2000
3000
4000

350
500
900

1400
2000
2885
3785

Maximum
Valve L/s

165
236
425

661

944
1416
1888

165

236

425

661

944
1362
1787

Maximum

Controller Cfm

40-350
60-500

105-900

165-1400
240-2000
320-3000
420-4000

63-350
73-500

134-900

215-1400
300-2000
408-2887
536-3789

Maximum

Controller L/s

19-165
28-236
50-425

77-661

111-944
151-1416
198-1888

30-165
35-236
63-425

102-661

141-944
193-1363
253-1788

Minimum

Controller Cfm

0, 40-350
0, 60-500

0, 105-900

0, 165-1400
0, 240-2000
0, 320-3000
0, 420-4000

0, 63-350
0, 73-500

0, 134-900

0, 215-1400
0, 300-2000
0, 408-2887
0, 536-3789

Minimum

Controller L/s

0, 19-350
0, 28-236
0, 50-425

0, 77-661

0, 111-944
0, 151-1416
0, 198-1888

0, 30-165
0, 35-236
0, 63-425

0, 102-661

0, 141-944
0, 193-1363
0, 253-1788

Constant Volume

Cfm

40-350
60-500

105-900

165-1400
240-2000
320-3000
420-4000

63-350
73-500

134-900

215-1400
300-2000
408-2887
536-3789

Constant

Volume L/s

19-350
28-236
50-425

77-661

111-944
151-1416
198-1888

30-165
35-236
63-425

102-661

141-944
193-1363
253-1788

Table 6. Unit air pressure drop – in. wg (I-P)

Fan/Inlet Size Airflow Cfm Cooling Only Fan/Inlet Size Airflow Cfm Cooling Only

02SQ-05

02SQ-06

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

02SQ-08

40
150
250
350

60
200
350
500

105
350
600
900

0.01

0.03

0.08

0.17

0.01

0.05

0.17

0.35

0.01

0.03

0.09

0.21

04SQ-14

05SQ-10

05SQ-12

320
1200
2100
3000

165

550

950
1400

240

750
1350
2000

24 VAV-PRC012-EN

0.01

0.01

0.01

0.01

0.01

0.01

0.02

0.05

0.01

0.01

0.01

0.01

Performance Data

Table 6. Unit air pressure drop – in. wg (I-P) (continued)

Fan/Inlet Size Airflow Cfm Cooling Only Fan/Inlet Size Airflow Cfm Cooling Only

02SQ-10

03SQ-06

03SQ-08

03SQ-10

03SQ-12

04SQ-08

04SQ-10

04SQ-12

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

165
550
950

1400

60
200
350
500

105
350
600
900

165
550
950

1400

240
750

1350
2000

105
350
600
900

165
550
950

1400

240
750

1350
2000

0.01

0.01

0.01

0.01

0.01

0.06

0.19

0.40

0.01

0.03

0.08

0.20

0.01

0.01

0.02

0.05

0.01

0.01

0.01

0.01

0.01

0.03

0.08

0.20

0.01

0.01

0.02

0.05

0.01

0.01

0.01

0.01

05SQ-14

06SQ-10

06SQ-12

06SQ-14

06SQ-16

07SQ-10

07SQ-12

07SQ-14

07SQ-16

320
1200
2100
3000

165

550

950
1400

240

750
1350
2000

320
1200
2100
3000

420
1600
2800
4000

165

550

950
1400

240

750
1350
2000

320
1200
2100
3000

420
1600
2800
4000

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

0.01

Table 7. Coil air pressure drop – in. wg (I-P)

Fan Size Airflow Cfm 1-Row HW (in. wg) 2-Row HW (in. wg)

02SQ

03SQ
04SQ
05SQ

06SQ
07SQ

Note: HW Coil Only pressure drops do not include unit pressure drop.

100
200
300
400
500

250
500

750
1000
1250
1400

600

900
1200
1500
1800
2000

0.00

0.01

0.01

0.02

0.02

0.01

0.02

0.04

0.07

0.10

0.12

0.02

0.04

0.06

0.09

0.12

0.15

VAV-PRC012-EN 25

0.00

0.01

0.02

0.03

0.05

0.02

0.04

0.08

0.13

0.19

0.23

0.04

0.07

0.11

0.16

0.22

0.27

Performance Data

Table 8. Attenuator air pressure drop (I-P)

Fan Size Plenum Cfm Attenuator Fan Size Plenum Cfm Attenuator

02SQ

03SQ

04SQ

Note: Plenum cfm = (Fan cfm)

50
200
350
500
650
750

50
250
500
750

1000
1200

50
300
600
900

1200
1450

0.00

0.00

0.01

0.02

0.04

0.06

0.00

0.00

0.00

0.00

0.01

0.06

0.00

0.01

0.02

0.03

0.05

0.06

05SQ

06SQ

07SQ

50
300
600
900

1200
1550

50
500
900

1300
1650
1900

50
500

1000
1500
2000
2500

0.00

0.00

0.02

0.06

0.13

0.24

0.00

0.01

0.03

0.06

0.10

0.14

0.00

0.01

0.04

0.08

0.15

0.25

Table 9. Attenuator air pressure drop (SI)

Fan Size Plenum L/s Attenuator Fan Size Plenum L/s Attenuator

02SQ

03SQ

04SQ

Note: Plenum cfm = (Fan cfm)

24

94
165
236
307
354

24
118
236
354
472
566

24
142
283
425
566
684

10
14

14

11
14

0
0
2
5

0
0
0
0
2

0
3
5
8

05SQ

06SQ

07SQ

24
142
283
425
566
731

24
236
425
613
779
897

24
236
472
708
944

1180

0
1

5
15
32
61

0

2

7
15
26
35

0

2

9
21
38
62

Table 10. Coil air pressure drop – Pa (SI)

Fan Size Airflow L/s 1-Row HW (Pa) 2-Row HW (Pa)

02SQ

03SQ
04SQ
05SQ

200
300
400
500
600

118
236
354
472
590
661

0
1
2
4
6

2

5
10
17
25
31

26 VAV-PRC012-EN

1
3
5
8

12

4
11
21
33
47
57

Performance Data

Table 10. Coil air pressure drop – Pa (SI)

06SQ
07SQ

Note: HW Coil Only pressure drops do not include unit pressure drop.

900
1200
1500
1800
2150
2500

5

9
15
22
30
36

Table 11. Unit air pressure drop-Pa (SI)

Fan/Inlet Size Airflow L/s Cooling Only Fan/Inlet Size Airflow L/s Cooling Only

19

02SQ-05

02SQ-06

02SQ-08

02SQ-10

03SQ-06

03SQ-08

03SQ-10

03SQ-12

04SQ-08

04SQ-10

04SQ-12

Note: Unit pressure drops do not include hot water coil or attenuator pressure drops.

71
118
165

28

94
165
236

50
165
283
425

78
260
448
661

28

94
165
236

50
165
283
425

78
260
448
661

113
354
637
944

50
165
283
425

78
260
448
661

113
354
637
944

2

7
20
41

2
13
41
86

2

8
23
51

2

2

2

3

2
15
48
99

2

6
21
49

2

2

6
13

2

2

2

2

2

6
21
49

2

2

6
13

2

2

2

2

04SQ-14

05SQ-10

05SQ-12

05SQ-14

06SQ-10

06SQ-12

06SQ-14

06SQ-16

07SQ-10

07SQ-12

07SQ-14

07SQ-16

151
566
991

1416

78
260
448
661

113
354
637
944

151
566
991

1416

78
260
448
661

113
354
637
944

151
566
991

1416

198
755

1321
1888

78
260
448
661

113
354
637
944

151
566
991

1416

198
755

1321
1888

10
18
28
41
56
67

2
2
2
2

2
2
6

13

2
2
2
2

2
2
2
2

2
2
2
2

2
2
2
2

2
2
2
2

2
2
2
2

2
2
2
2

2
2
2
2

2
2
2
2

2
2
2
2

VAV-PRC012-EN 27

Performance Data

VPCF and VPEF maximum

Minimum

1-row coil maximum

2-row coil maximum

Note: When attenuator is required, add inlet

attenuator pressure to discharge static
pressure for final fan performance.

Pa In. wg

0.60

150

0.50

125

0.40

100

0.30

75

Discharge Static Pressure

0.20

50

0.10

25

Pa In. wg

0.80

199

0.70

174

0.60

150

0.50

125

0.40

100

0.30

75

0.20

50

Discharge Static Pressure

0.10

25

200 300 400 500

94 142 189 236

100

47

(57 L/s)

120 cfm min

(118 L/s)

250 cfm min

Parallel 02SQ—PSC

200 300 400

94

142

189 236

Airflow

Parallel Fan Size 03SQ—PSC

700

600

330

283

Airflow

800

378

900

425

500

1000

472

1100

519

1200

566

700600

Cfm

330283

L/s

1300

Cfm

614

L/s

Pa

In. wg

199

0.80

174

0.70

150

0.60

125

0.50

0.40

100

0.30

75

Discharge Static Pressure

0.20

50

0.10

25

200 400 600 800 1000 1200 1400 1600

300 cfm min

94

(142 L/s)

189

Parallel 04SQ—PSC

283

378 472 566

661

755

Cfm

L/s

Airflow

28 VAV-PRC012-EN

Performance Data

VPCF and VPEF maximum

Minimum

1-row coil maximum

2-row coil maximum

Note: When attenuator is required, add inlet

attenuator pressure to discharge static
pressure for final fan performance.

Pa In. wg

0.80

199

174

0.70

0.60

150

125

0.50

0.40

100

75

0.30

Discharge Static Pressure

50

0.20

0.10

25

Pa In. wg

199

0.80

0.70

174

150

0.60

0.50

125

0.40

100

0.30

75

Discharge Static Pressure

50

0.20

(165 L/s)

350 cfm min

300 500 700 900 1100 1300 1500 1700

142

236 330

(250 L/s)

530 cfm min

Parallel 05SQ—PSC

425

519

Airflow

Parallel 06SQ—PSC

614

708

802

Cfm

L/s

25

0.10
400

600 800 1000

283

189

378

1200

566 850

1600 1800 2000 2200

1400

755661472

944

1038

Cfm

L/s

Airflow

Pa In. wg

0.80

199

0.70

174

0.60

150

(276 L/s)

0.50

125

0.40

100

0.30

75

Discharge Static Pressure

0.20

50

25

0.10

585 cfm min

500 700 900 1100

236

425330

Parallel 07SQ—PSC

1300

519

1500 1700

708 897 1086

1900 2100

2300

991802614

Cfm

L/s

Airflow

VAV-PRC012-EN 29

Performance Data

VPCF and VPEF maximum

Minimum

1-row coil maximum

2-row coil maximum

Notes:

1. ECMs (Electrically Commutated Motors) are
ideal for systems seeking maximum motor
efficiency.

2. When attenuator is required, add inlet
attenuator pressure to discharge static
pressure for final fan performance.

Pa In. wg

125

0.50

0.40

100

(76 L/s)

0.30

75

0.20

50

Discharge Static Pressure

25

0.10

Pa In. wg

0.50

125

0.40

100

0.30

75

0.20

50

Discharge Static Pressure

0.10

25

160 cfm min

100 200 300 400 500 600 700 800 900 1000 1100

47

220 cfm min

200 400 600 800 1000 1200 1400 1600

94 189 283

142

(104 L/s)

VPxF 03SQ—ECM

236 330 425 47294 189

283 378 519

Airflow

VPxF 04SQ—ECM

Airflow

Cfm

L/s

661566472378

755

Cfm

L/s

Pa In. wg

0.50

125

0.40

100

0.30

75

50

0.20

Discharge Static Pressure

25

0.10

(132 L/s)

280 cfm min

200 400 600 800 1000 1200 1400 1800 2000

94 189

283 850

VPxF 05SQ—ECM

1600

661566472378

755

944

Cfm

L/s

Airflow

30 VAV-PRC012-EN