Trane Intellipak Rt Svx10c En User Manual

Installation

Operation

RT-SVX10C-EN

Maintenance

Library

Service Literature

Unitary

Product Section

Product

Rooftop Air Conditioning (Comm. SZ, 20 - 130 Tons)

SAH_, SEH_, SFH_, SLH_, SSH_, SXH_

Installation/Operation/Maintenance

10C

Model

Literature Type

Sequence

Date

January 2005

File No.

SV-UN-RT-RT-SVX10C-EN-01-05

RT-SVX10C-EN 11/04

Supersedes

INTELLIPAK^™

Commercial Single-Zone Rooftop Air

Conditioners with CV or VAV Controls

Models

"5" and later Design Sequence

SAHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75

SEHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75

SFHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75

SLHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75

SSHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75

SXHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75

- Units whose model numbers

have a "1" in digit 20 are certified

by Underwriters Labortory.

"X" and later Design Sequence

SXHG -C90, -D11, -D12, -D13 SEHG -C90, -D11, -D12, -D13

SFHG -C90, -D11, -D12, -D13 SLHG -C90, -D11, -D12, -D13

SSHG -C90, -D11, -D12, -D13

- Units whose model numbers

have a "2" in digit 20 are certified

by the Canadian Standards

Association (CSA).

Trane has a policy of continuous product and product data improvement and

reserves the right to change design and specifications without notice. Only

qualified technicians should perform the installation and servicing of

equipment referred to in this publication.

With 3-D^TMScroll Compressors

Table of Contents

Section One

Section Four

About The Manual ...............................................................2

Literature Change History ................................................2

Overview of Manual .........................................................2

Unit Start-Up ......................................................................55

Cooling Sequence of Operation ....................................55

Gas Heating Sequence of Operation.............................56

Fenwal Ignition System ..................................................56

Honeywell Ignition System.............................................56

Modulating Gas Sequence of Operation .......................57

Flame Failure .................................................................57

Electric Heat Sequence of Operation ............................58

Wet Heat Sequence of Operation ..................................58

Electrical Phasing ..........................................................59

Voltage Supply and Voltage Imbalance .........................60

Service Test Guide for Component Operation...............61

Verifying Proper Fan Rotation .......................................63

If all of the fans are rotating backwards;........................63

System Airflow Measurements ......................................63

Constant Volume Systems.............................................63

Variable Air Volume Systems .........................................65

Exhaust Airflow Measurement .......................................66

Traq^TMSensor Airflow Measurement............................ 66

Economizer Damper Adjustment ................................. 80

Compressor Start-Up ................................................... 82

Compressor Operational Sounds ................................ 83

Thermostatic Expansion Valves ................................... 93

Charging by Subcooling .............................................. 93

Low Ambient Dampers ................................................. 93

Electric, Steam and Hot Water Start-Up ...................... 94

Gas Furnace Start-Up .................................................. 94

Two Stage Gas Furnace ............................................... 95

Full Modulating Gas Furnace ....................................... 97

Limited Modulating Gas Furnace ................................ 98

Final Unit Checkout ...................................................... 99

Section Two

General Information .............................................................4

Model Number Description ..............................................4

Hazard Identification ........................................................6

Commonly Used Acronyms .............................................6

Unit Description................................................................6

Input Devices & System Functions ..................................8

Constant Volume & Variable Air Volume Units ................8

Constant Volume (CV) Units ..........................................10

Variable Air Volume (VAV) Units .................................... 11

Space Temperature Averaging .......................................12

Unit Control Modules (UCM) ..........................................12

Section Three

Installation..........................................................................14

Unit Inspection ...............................................................14

Storage ...........................................................................14

Unit Clearances .............................................................14

Unit Dimensions & Weight Information ..........................14

Roof Curb and Ductwork ...............................................22

Pitch Pocket Location ....................................................23

Unit Rigging & Placement ..............................................23

General Unit Requirements ...........................................25

Main Electrical Power Requirements.............................25

Field Installed Control Wiring.........................................25

Requirements for Electric Heat Units ............................25

Requirements for Gas Heat ...........................................25

Requirements for Hot Water Heat (SLH_) .....................25

Requirements for Steam Heat (SSH_) ..........................26

O/A Pressure Sensor and Tubing Installation ...............26

Condensate Drain Connection.......................................27

Shipping Fasteners ........................................................27

O/A Sensor & Tubing Installation ...................................31

Units with Statitrac™; ....................................................31

Gas Heat Units (SFH_) ..................................................32

Connecting the Gas Supply Line to the Furnace

Section Five

Service & Maintenance....................................................100

Fan Belt Adjustment .....................................................104

Scroll Compressor Replacement .................................105

VFD Programming Parameters ...................................106

Monthly Maintenance ...................................................107

Filters............................................................................107

Cooling Season ............................................................107

Heating Season............................................................108

Coil Cleaning ................................................................108

Final Process .............................................................. 109

Index ........................................................................... 111

Warranty ..................................................................... 114

Gas Train........................................................................32

Flue Assembly Installation .............................................34

Hot Water Heat Units (SLH_) ........................................34

Steam Heat Units (SSH_) ..............................................35

Disconnect Switch External Handle...............................38

Electric Heat Units (SEH_) ............................................38

Main Unit Power Wiring .................................................38

Disconnect Switch Sizing (DSS)....................................44

Field Installed Control Wiring.........................................45

Controls using 24 VAC ...................................................45

Controls using DC Analog Input/Outputs.......................45

Constant Volume System Controls ................................45

Variable Air Volume System Controls ............................46

Constant Volume or Variable Air Volume System

Controls ..........................................................................46

General Information

Model Number Description

All products are identified by a multiple character model

number listed on the unit nameplate. An explanation of the

alphanumeric identification code is provided below. Its use

can define the unit's specific components, type of applica-

tion, i.e. CV or VAV, for a particular unit.

When ordering replacement parts or requesting service, be

sure to refer to the specific model number, serial number,

and DL number (if applicable) stamped on the unit name-

plate.

Sample Model No.:

Digit No.:

S X H F - C20 4 0 A

1 2 3 4 5,6,7 8 9 10 11 12 13 14 15 16 17 18 19 20 21+

A,R,L,etc.

Digit 1 - Unit Type

S = Self-Contained

Digit 10 - Design Sequence

3 = Disconnect Redesign

Note: Sequence may be any letter

A thru Z, or any digit 1 thru 9.

Digit 17 - System Control

1 = CV Control (Zone Control)

2 = VAV-(S/A Temp Control

without Inlet Guide Vanes)

3 = VAV-(S/A Temp Control

with Inlet Guide Vanes)

4 = Space Pressure Control with Exhaust VFD

without Bypass

5 = Space Pressure Control with Exhaust VFD

Digit 2 - Unit Function

A = DX Cooling, No Heat

E = DX Cooling, Electric Heat

F = DX Cooling, Natural Gas Heat

L = DX Cooling, Hot Water Heat

S = DX Cooling, Steam Heat

Digit 11 - Exhaust Option

0 = None

1 = Barometric

2 = 100% - 1.5 HP*

3 = 100% - 3 HP*

4 = 100% - 5 HP*

5 = 100% - 7.5 HP*

6 = 100% - 10 HP*

X = DX Cooling, Extended Casings

# = DX Cooling, Propane Gas Heat

and Bypass

6 = VAV Supply Air Temperature Control

with VFD w/o Bypass

7 = VAV Supply Air Temperature Control

Digit 3 - Unit Airflow

H = Single-Zone

7 = 100% - 15 HP*

8 = 100% - 20 HP*

A = 50% - 1.5 HP

with VFD and Bypass

8 = Supply and Exhaust Fan with VFD

without Bypass

Digit 4 - Development Sequence

F = Sixth

B = 50% - 3 HP

9 = Supply and Exhaust Fan with VFD

and Bypass

C = 50% - 5 HP

D = 50% - 7.5 HP

E = 100% - 1.5 HP**

F = 100% - 3 HP**

G = 100% - 5 HP**

H = 100% - 7.5 HP**

J = 100% - 10 HP**

K = 100% - 15 HP**

L = 100% - 20 HP**

Digits 5, 6, 7 - Nominal Capacity

C20 = 20 Tons C55 = 55 Tons

C25 = 25 Tons C60 = 60 Tons

C30 = 30 Tons C70 = 70 Tons

C40 = 40 Tons C75 = 75 Tons

C50 = 50 Tons

Digit 18 - Accessory Panel

0 = None

A = BAYSENS008*

B = BAYSENS010*

C = BAYSENS013*

D = BAYSENS014*

E = BAYSENS019*

F = BAYSENS020*

G = BAYSENS021*

Digit 8 - Power Supply

4 = 460/60/3 XL

5 = 575/60/3 XL

E = 200/60/3 XL

# = 50% w/ Statitrac

* w/Statitrac

** w/o Statitrac (CV only)

F = 230/60/3 XL

Digit 19 - Ambient Control

0 = Standard

Note: SEHF units (unit with

electric heat) utilizing 208V or

230V require dual power source.

Digit 12 - Exhaust Fan Drive

0 = None

8 = 800 PRM

9 = 900 RPM

A = 1000 RPM

B = 1100 RPM

1 = 0 Degree Fahrenheit

4 = 400 RPM

5 = 500 RPM

6 = 600 RPM

7 = 700 RPM

Digit 20 - Agency Approval

0 = None (UL Gas Heater, see note)

1 = UL

Digit 9 - Heating Capacity

2 = CSA

Note: When the second digit

calls for "F" (Gas Heat), the

following values apply:

Additionally, please note G and

M available ONLY on 50 Ton

models and above.

Digit 13 - Filter Type

A = Throwaway

B = Cleanable Wire Mesh

C = High-Efficiency Throwaway

D = Bag with Prefilters

Note: Includes UL clsssified gas heating

section only when second digit of

Model No. is a "F".

Digits 21 - 38 - Miscellaneous

21 A = Unit Disconnect Switch

22 B = Hot Gas Bypass

H = High Heat - 2 Stage

L = Low Heat - 2 Stage

E = Cartridge with Prefilters

F = No Filters (T/A Rack Only)

0 = No Heat

J = Limited Modulating High Heat

G = No Filters (Bag/Cart. Rack Only)

23 C = Economizer Control w/Comparative

Enthalpy

G = Limited Modulating Low Heat

P = Full Modulating High Heat

M = Full Modulating Low Heat

23 Z = Economizer Control w/Reference

Digit 14 - Supply Fan Horsepower

1 = 3.0 HP 6 = 20.0 HP

Enthalpy

2 = 5.0 HP 7 = 25.0 HP

23 W = Economizer Control w/Dry Bulb

23 O = None W/O Economizer

3 = 7.5 HP 8 = 30.0 HP

4 = 10.0 HP 9 = 40.0 HP¹

5 = 15.0 HP

Note: When the second digit

24 E = Low Leak Fresh Air Dampers

25 F = High Duct Temperature Thermostat

calls for "E" (electric heat), the

following values apply:

D = 30 KW

H = 50 KW

R = 130 KW

U = 150 KW

26 G = High Capacity Evaporator Coil

27 H = Copper Fins (Cond. only)

Digit 15 - Supply Fan Drive

L = 70 KW

N = 90 KW

Q = 110 KW

Note: When the second digit calls

"L" (Hot Water) or "S" (Steam)

Heat, one of the following valve

size values must be in Digit 9:

High Heat Coil: 1 = 50", 2 = .75",

V = 170 KW

W = 190 KW

5 = 500 RPM

6 = 600 RPM

7 = 700 RPM

8 = 800 RPM

9 = 900 RPM

A = 1000 RPM

B = 1100 RPM

C = 1200 RPM

D = 1300 RPM

E = 1400 RPM

F = 1500 RPM

G = 1600 RPM

28 K = Generic B.A.S. Module

29 L = High-Efficiency Motors (Supply & Exhaust)

30 M = Remote Human Interface

31 N = Ventilation Override Module

32 R = Extended Grease Lines

33 T = Access Doors

34 V = Interprocessor Communications Bridge

35 0 = No communication module

Digit 16 - Fresh Air Section

A = No Fresh Air

B = 0-25% Manual

3 = 1", 4 = 1.25", 5 = 1.5", 6 = 2".

Low Heat Coil: A = .50", B = .75",

C = 1", D = 1.25", E = 1.5", F = 2".

35 Y = Trane Communication Interface Module

35 7 = LonTalk® Communication Interface Module

36 8 = Spring Isolators

D = 0-100% Economizer

37 6 = Factory-Powered 15A GFI Convenience

Outlet

38 0 = None

1. Available as standard 460 volt only for 70 and 75 ton models.

Sample Model No.: S X H G - D 1 1 4 0 A

C G

D 1

1 AT,etc

Digit No.:

1 2

6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21+

Digit 1 - Unit Type

S = Self-Contained

Digit 12 - Exhaust Air Fan Drive

0 = None

Digit 18 - Accessory Panel

0 = None

5 = 500 RPM

6 = 600 RPM

A = BAYSENS008*

B = BAYSENS010*

Digit 2 - Unit Function(s)

E = DX Cooling, Electric Heat

F = DX Cooling, Natural Gas Heat

L = DX Cooling, Hot Water Heat

S = DX Cooling, Steam Heat

7 = 700 RPM

8 = 800 RPM

C = BAYSENS013*

D = BAYSENS014*

E = BAYSENS019*

F = BAYSENS020*

Digit 13 - Filter

X = DX Cooling, Extended Casings

A = Throwaway

G = BAYSENS021*

C = High-Efficiency Throwaway

D = Bag with Prefilter

Digit 3 - Unit Airflow

Digit 19 - Ambient Control

H = Single-Zone

E = Cartridge with Prefilter

F = Throwaway Filter Rack Less Filter

Media

0 = Standard

Digit 4 - Development Sequence

Digit 20 - Agency Approval

G = Seventh

G = Bag Filter Rack Less Filter Media

0 = None (UL Gas Heater See Note 1)

1 = UL

2 = CSA

Digits 5, 6, 7 - Nominal Capacity

C90 = 90 Tons

D11 = 105 Tons

Digit 14 - Supply Air Fan HP

C = 30 HP (2-15 HP)

D = 40 HP (2-20 HP)

Note: Includes UL classified gas

heating section only when second

digit of Model No. is a "F".

D12 = 115 Tons

E = 50 HP (2-25 HP)

D13 = 130 Tons

F = 60 HP (2-30 HP)

G = 80 HP (2-40 HP)

Digits 21 - 36 - Miscellaneous

21 A = Unit Disconnect Switch

22 B = Hot Gas Bypass

23 C = Economizer Control

with Comparative Enthalpy

23 Z = Economizer Control

with Reference Enthalpy

23 W = Economizer Control w/Dry Bulb

23 0 = None W/O Economizer

24 E = Low-Leak Fresh Air Dampers

25 F = High Duct Temperature Thermostat

26 G = High Capacity Evaporator

Coil (90 - 105 Only)

27 K = Generic BAS Module

28 L = High Efficiency Motors

(Supply and Exhaust)

Digit 8 Power Supply

4 = 460/60/3 XL

Digit 15 - Supply Air Fan Drive

A = 1000 RPM

B = 1100 RPM

C = 1200 RPM

D = 1300 RPM

E = 1400 RPM

5 = 575/60/3 XL

E = 200/60/3 XL

F = 230/60/3 XL

Digit 9 - Heating Capacity

0 = No Heat

H = High Heat - 2 Stage

J = Limited Modulating High Heat

P = Full Modulating High Heat

Note: When the second digit calls

for "E" (electric heat), the following

values apply in the ninth digit:

W=190 kw

F = 1500 RPM

G = 1600 RPM

Digit 16 - Fresh Air

D = 0-100% Economizer (Std.)

Digit 17 - System Control

1 = Constand Volume Control

2 = VAV Supply Air Temperature

Control without Inlet Guide Vanes

3 = VAV - Supply Air Temperature

Control with Inlet Guide Vanes

4 = Space Pressure Control with

Exhaust VFD w/o Bypass

29 M = Remote Human Interface

30 N = Ventilation Override Module

31 R = Extended Grease Lines

32 T = Access Doors

33 V = Inter-processor Communication

Bridge

34 0 = No communication module

34 Y = Trane Communication Interface Module

34 7 = LonTalk® Communication Interface Module

Note: When the second digit calls for

"L" or "S", one of the following valve

size values must be in Digit 9:

High Heat Coil: 3 = 1.0", 4 = 1.25",

5 = 1.50", 6 = 2.0", 7 = 2.5"

Low Heat Coil: C = 1.0", D = 1.25",

E = 1.50", F = 2.0", G = 2.5"

5 = Space Pressure Control with

Exhaust and Bypass

Digit 10 - Design Sequence

W = Disconnect Redesign

Note: Sequence may be any letter

A thru Z, or any digit 1 thru 9.

6 = VAV Supply Air Temperature Control 35 0 = None

with VFD without Bypass

7 = VAV Supply Air Temperature Control

36 6 = Factory-Powered 15A GFI

Convenience Outlet

with VFD and Bypass

8 = Supply and Exhaust Fan with

VFD and without Bypass

9 = Supply and Exhaust Fan with

VFD and Bypass

Digit 11 - Exhaust Option

O = None

7 = 100%, 15 HP w/ Statitrac

8 = 100%, 20 HP w/ Statitrac

9 = 100%, 25 HP w/ Statitrac

F = 50%, 15 HP

H = 100%, 30 HP w/ Statitrac

J = 100%, 40 HP w/ Statitrac

K = 100%, 15 HP w/o Statitrac (CV Only)

L = 100%, 20 HP w/o Statitrac (CV Only)

M = 100%, 25 HP w/o Statitrac (CV Only)

N = 100%, 30 HP w/o Statitrac (CV Only)

P = 100%, 40 HP w/o Statitrac (CV Only)

Echelon, LON, LONWORKS, LonBuilder, NodeBuilder, LonManager,

LonTalk, LonUsers, Neuron, 3120, 3150, the Echelon logo, and the

LonUsers logo are trademarks of Echelon Corporation registered in the

United States and other countries. LonLink, LonResponse, LonSupport,

LonMaker, and LonPoint are trademarks of Echelon Corporation.

General Information (Continued)

Unit Nameplate

Commonly Used Acronyms

For convenience, a number of acronyms and abbreviations

are used throughout this manual. These acronyms are al-

phabetically listed and defined below.

BAS = Building automation systems

CFM = Cubic-feet-per-minute

CKT. = Circuit

One Mylar unit nameplate is located on the outside upper

left corner of the control panel door. It includes the unit

model number, serial number, electrical characteristics,

weight, refrigerant charge, as well as other pertinent unit

data. A small metal nameplate with the Model Number, Se-

rial Number, and Unit Weight is located just above the Mylar

nameplate, and a third nameplate is located on the inside of

the control panel door.

CV = Constant volume

CW = Clockwise

CCW = Counterclockwise

E/A = Exhaust air

ECEM = Exhaust/comparative enthalpy module

F/A = Fresh air

Compressor Nameplate

The Nameplate for the Scroll Compressor is located on the

compressor lower housing.

GBAS = Generic building automation system

HGBP = Hot gas bypass

HI = Human Interface

Hazard Identification

HVAC = Heating, ventilation and air conditioning

IGV = Inlet guide vanes

I/O = Inputs/outputs

IOM = Installation/operation/ maintenance manual

IPC = Interprocessor communications

IPCB = Interprocessor communications bridge

LCI-I = LonTalk Communication Interface for IntelliPak

LH = Left-hand

MCM = Multiple compressor module

MWU = Morning warm-up

NSB = Night setback

O/A = Outside air

psig = Pounds-per-square-inch, gauge pressure

R/A = Return air

potentially hazardous

situation which, if not avoided, could result in death or

serious injury.

WARNING– Indicates a

CAUTION – Indicates a potentially hazardous

situation which, if not avoided, may result in minor or

moderate injury. It may also be used to alert against

unsafe practices.

RH = Right-hand

RPM = Revolutions-per-minute

RT = Rooftop unit

RTM = Rooftop module

S/A = Supply air

SCM = Single circuit module

SZ = Single-zone (unit airflow)

TCI = Tracer communications module

UCM = Unit control modules

VAV = Variable air volume

VCM = Ventilation control module

VOM = Ventilation override module

w.c. = Water column

WARNING

Fiberglass Wool

Product contains fiberglass wool. Disturbing the insula-

tion in this product during installation, maintenance or

repair will expose you to airborne particles of glass

wool fibers and ceramic fibers known to the state of

California to cause cancer through inhalation. Glass

wool fibers may also cause respiratory, skin or eye irri-

tation.

Precautionary Measures

Unit Description

Each Trane commercial, single-zone rooftop air conditioner

ships fully assembled and charged with the proper refriger-

ant quantity from the factory.

An optional roof curb, specifically designed for the S_HF

and S_HG units is available from Trane. The roof curb kit

must be field assembled and installed according to the lat-

est edition of SAHF-IN-5 or SXHG-IN-2 respectively.

Trane Commercial Rooftop Units are controlled by a micro-

electronic control system that consists of a network of mod-

ules and are referred to as Unit Control Modules (UCM).

The acronym UCM is used extensively throughout this

document when referring to the control system network.

- Avoid breathing fiberglass dust.

- Use a NIOSH approved dust/mist respirator.

- Avoid contact with the skin or eyes. Wear long-

sleeved, loose-fitting clothing, gloves, and eye

protection.

- Wash clothes separately from other clothing:

rinse washer thoroughly.

- Operations such as sawing, blowing, tear-out, and

spraying may generate fiber concentrations requiring

additional respiratory protection. Use the appropriate

NIOSH approved respiration in these situations.

These modules through Proportional/Integral control algo-

rithms perform specific unit functions which provide the best

possible comfort level for the customer.

First Aid Measures

They are mounted in the control panel and are factory

wired to their respective internal components. They receive

and interpret information from other unit modules, sensors,

remote panels, and customer binary contacts to satisfy the

applicable request for economizing, mechanical cooling,

heating, and ventilation. Refer to the following discussion for

an explanation of each module function.

Eye Contact - Flush eyes with water to remove

dust. If symptoms persist, seek medical attention.

Skin Contact - Wash affected areas gently with soap

and warm water after handling.

General Information (Continued)

Rooftop Module (RTM - 1U48 Standard on all units)

The Rooftop Module (RTM) responds to cooling, heating,

and ventilation requests by energizing the proper unit com-

ponents based on information received from other unit mod-

ules, sensors, remote panels, and customer supplied bi-

nary inputs. It initiates supply fan, exhaust fan, exhaust

damper, inlet guide vane positioning or variable frequency

drive output, and economizer operation based on that in-

formation.

Ventilation Override Module (VOM - Optional 1U51)

The Ventilation Override module initiates specified func-

tions such as; space pressurization, exhaust, purge, purge

with duct pressure control, and unit off when any one of the

five (5) binary inputs to the module are activated. The com-

pressors and condenser fans are disabled during the ven-

tilation operation. If more than one ventilation sequence is

activated, the one with the highest priority is initiated.

RTM Resistance Input vs Setpoint Temperatures

Interprocessor Communications Board (IPCB -

Optional 1U55 used with the Optional Remote Human

Interface)

The Interprocessor Communication Board expands commu-

nications from the rooftop unit UCM network to a Remote

Human Interface Panel. DIP switch settings on the IPCB

module for this application should be; Switches 1 and 2

"Off", Switch 3 "On".

RTM cooling or

RTM cooling

heating

setpoint input

used as the

source for a

used as the

source for

SUPPLY AIR

Resistance

(Ohms) Max.

Tolerance 5%

ZONE temp

temp setpoint

setpoint (^oF)

cooling (^oF)

n/a

1084

992

899

796

695

597

500

403

305

208

111

Trane Communications Interface Module (TCI - Optional

1U54 used on units with Trane ICS^TM

)

The Trane Communication Interface module expands com-

munications from the unit UCM network to a Trane Tracer

100^TMor a Tracer Summit^TMsystem and allows external

setpoint adjustment and monitoring of status and diagnos-

tics. DIP Switch settings on the TCI

module for these applications should be:

Tracer 100 (Comm3): Switches 1, 2, and 3 are "Off";

Tracer Summit (Comm4): Switch 1 is "On", switches 2, and

3 are "Off"

Lontalk Communication Interface Module (LCI - Optional

1U54 - used on units withTrane ICS^TMor 3rd party Build-

ing AutomationSystems)

The LonTalk Communication Interface module expands

communications from the unit UCM network to a Trane

Tracer Summit^TMor a 3rd party building automation system,

utilizing LonTalk, and allows external setpoint and configu-

ration adjustment and monitoring of status and diagnostics.

RTM Resistance Value vs System Operating Mode

Resistance

applied to RTM

MODE input

Terminals (Ohms)

Max. Tolerance

Constant Volume Units

Fan

Mode

Auto

System

Mode

Off

2320

4870

7680

10770

Cool

Auto

Off

Exhaust/Comparative Enthalpy Module (ECEM -

Optional 1U52 used on units with Statitrac and/or

comparative enthalpy options)

The Exhaust/Comparative Enthalpy module receives infor-

mation from the return air humidity sensor, the outside air

humidity sensor, and the return air temperature sensor to

utilize the lowest possible humidity level when considering

economizer operation. In addition, it receives space pres-

sure information which is used to maintain the space pres-

sure to within the setpoint controlband. Refer to the table

below for the Humidity vs Voltage input values.

Auto

Cool

Auto

Heat

13320

16130

19480

27930

Compressor Module (SCM & MCM - 1U49 standard on

all units)

The Compressor module, (Single Circuit & Multiple Circuit),

upon receiving a request for mechanical cooling, energizes

the appropriate compressors and condenser fans. It moni-

tors the compressor operation through feedback information

it receives from various protection devices.

Human Interface Module (HI - 1U65 standard on all

units)

The Human Interface module enables the operator to adjust

the operating parameters for the unit using it's 16 key key-

pad. The 2 line, 40 character LCD screen provides status

information for the various unit functions as well as menus

for the operator to set or modify the operating parameters.

Heat Module (1U50 used on heating units)

The Heat module, upon receiving a request for Heating, en-

ergizes the appropriate heating stages or strokes the Modu-

lating Heating valve as required.

General Information (Continued)

Ventilation Control Module (VCM - Design special

option only)

For complete application details of the module, refer to En-

gineering Bulletin RT-EB-109.

The Ventilation Control Module (VCM) is located in the filter

section of the unit and is linked to the unit's UCM network.

Using a "velocity pressure" sensing ring located in the fresh

air section, allows the VCM to monitor and control the quan-

tity of fresh air entering the unit to a minimum airflow set-

point.

Input Devices & System Functions

The descriptions of the following basic Input Devices used

within the UCM network are to acquaint the operator with

their function as they interface with the various modules.

Refer to the unit's electrical schematic for the specific mod-

ule connections.

An optional temperature sensor can be connected to the

VCM which enables it to control a field installed fresh air

preheater.

Constant Volume & Variable Air Volume Units

An optional CO sensor can be connected to the VCM to

control CO res²et. The reset function adjust the minimum

CFM upwa²rd as the CO₂concentrations increase. The

maximum effective (reset) setpoint value for fresh air enter-

ing the unit is limited to the systems operating CFM. The

following table lists the Minimum Outside Air CFM vs Input

Voltage.

Supply Air Temperature Sensor (3RT9)

Is an analog input device used with CV & VAV applications.

It monitors the supply air temperature for; supply air tem-

perature control (VAV), supply air temperature reset (VAV),

supply air temperature low limiting (CV), supply air temper-

ing (CV/VAV). It is mounted in the supply air discharge sec-

tion of the unit and is connected to the RTM (1U48).

Minimum Outside Air Setpoint

w/VCM Module & Traq^TMSensing

Return Air Temperature Sensor (3RT6)

Is an analog input device used with a return humidity sen-

sor on CV & VAV applications when the comparative en-

thalpy option is ordered. It monitors the return air tempera-

ture and compares it to the outdoor temperature to estab-

lish which temperature is best suited to maintain the cooling

requirements. It is mounted in the return air section and is

connected to the ECEM (1U52).

Unit

20 & 25 Ton

30 Ton

40 Ton

50 & 55 Ton

Input Volts

0.5 - 4.5 vdc

CFM

0 - 14000

0 - 17000

0 - 22000

0 - 28000

0 - 33000

0 - 46000

60 thru 75 Ton 0.5 - 4.5 vdc

90 thru 130 Ton 0.5 - 4.5 vdc

Evaporator Temperature Sensor (3RT14 and 3RT15)

Is an analog input device used with CV & VAV applications.

It monitors the refrigerant temperature inside the evaporator

coil to prevent coil freezing. It is attached to the suction line

near the evaporator coil and is connected to the SCM/MCM

(1U49). It is factory set for 30 F and has an adjustable

range of 25 F to 35 F. The compressors are staged "Off" as

necessary to prevent icing. After the last compressor stage

has been turned "Off", the compressors will be allowed to

restart once the evaporator temperature rises 10 F above

the "coil frost cutout temperature" and the minimum three

minute "Off" time has elapsed.

The velocity pressure transducer/solenoid assembly is illus-

trated below. Refer to the "Traq^TMSensor Sequence of Op-

eration" section for VCM operation.

Velocity Pressure Transducer/Solenoid Assembly

Filter Switch (3S21)

Is a binary input device used on CV & VAV applications. It

measures the pressure differential across the unit filters. It

is mounted in the filter section and is connected to the RTM

(1U48). A diagnostic SERVICE signal is sent to the remote

panel if the pressure differential across the filters is at least

0.5" w.c.. The contacts will automatically open when the

pressure differential across the filters decrease to 0.4" w.c..

The switch differential can be field adjusted between 0.17"

w.c. to 5.0" w.c. ± 0.05" w.c..

Supply and Exhaust Airflow Proving Switches (3S68

and 3S69)

Generic Building Automation System Module

(GBAS - Optional 1U51 used with non-Trane building

control systems)

3S68 is a binary input device used on CV & VAV applica-

tions to signal the RTM when the supply fan is operating. It

is located in the supply fan section of the unit and is con-

nected to the RTM (1U48). During a request for fan opera-

tion, if the differential switch is detected to be open for 40

consecutive seconds; compressor operation is turned "Off",

heat operation is turned "Off", the request for supply fan op-

eration is turned "Off" and locked out, IGV's (if equipped)

are "closed", exhaust dampers (if equipped) are "closed",

economizer dampers (if equipped) are "closed", and a

manual reset diagnostic is initiated.

The Generic Building Automation System (GBAS) module

allows a non-Trane building control system to communicate

with the rooftop unit and accepts external setpoints in form

of analog inputs for cooling, heating, supply air pressure,

and a binary Input for demand limit. Refer to the "Field In-

stalled Control Wiring" section for the input wiring to the

GBAS module and the various desired setpoints with the

corresponding DC voltage inputs for both VAV and CV ap-

plications.

General Information (Continued)

3S69 is a binary input device used on all rooftop units

equipped with an exhaust fan. It is located in the exhaust

fan section of the unit and is connected to the RTM (1U48).

During a request for fan operation, if the differential switch

is detected to be open for 40 consecutive seconds, the

economizer is closed to the minimum position setpoint, the

request for exhaust fan operation is turned "Off" and locked

out, and a manual reset diagnostic is initiated. The fan fail-

ure lockout can be reset; at the Human Interface located in

the unit's control panel, by Tracer, or by cycling the control

power to the RTM (1S70 Off/On).

denser fans "On". If the operating fans can not bring the

condensing temperature to within the controlband, more

fans are turned on. As the saturated condensing tempera-

ture approaches the lower limit of the controlband, fans are

sequenced "Off". The minimum "On/Off" time for condenser

fan staging is 5.2 seconds. If the system is operating at a

given fan stage below 100% for 30 minutes and the satu-

rated condensing temperature is above the "efficiency

check point" setting, a fan stage will be added. If the satu-

rated condensing temperature falls below the "efficiency

check point" setting, the fan control will remain at the

present operating stage. If a fan stage cycles four times

within a 10 minute period, the control switches from control-

ling to the "lower limit" to a temperature equal to the "lower

limit" minus the "temporary low limit suppression" setting. It

will utilize this new "low limit" temperature for one hour to

reduce condenser fan short cycling.

Lead-Lag

Is a selectable mode of operation on 40 thru 130 Ton units

within the Human Interface. It alternates the starting be-

tween the first compressor of each refrigeration circuit. Only

the compressor banks will switch, not the order of the com-

pressors within a bank, providing the first compressor in

each circuit had been activated during the same request for

cooling.

High Pressure Controls

High Pressure controls are located on the discharge lines

near the scroll compressors. They are designed to open

when the discharge pressure approaches 405 ± 7 psig. The

controls reset automatically when the discharge pressure

decreases to approximately 300 ± 20 psig. However, the

compressors on that circuit are locked out and a manual re-

set diagnostic is initiated.

Supply and Exhaust Fan Circuit Breakers (1CB1, 1CB2)

The supply fan and exhaust fan motors are protected by cir-

cuit breakers 1CB1 and 1CB2 respectively. They will trip

and interrupt the power supply to the motors if the current

exceeds the breaker's "must trip" value. The rooftop module

(RTM) will shut all system functions "Off" when an open fan

proving switch is detected.

Outdoor Air Humidity Sensor (3U63)

Is an analog input device used on CV & VAV applications

with 100% economizer. It monitors the outdoor humidity lev-

els for economizer operation. It is mounted in the fresh air

intake section and is connected to the RTM (1U48).

Low Pressure Control

Is accomplished using a binary input device on CV & VAV

applications. LP cutouts are located on the suction lines

near the scroll compressors.

Return Air Humidity Sensor (3U64)

The LPC contacts are designed to close when the suction

pressure exceeds 22 ± 4 psig. If the LP control is open

when a compressor is requested to start, none of the com-

pressors on that circuit will be allowed to operate. They are

locked out and a manual reset diagnostic is initiated.

Is an analog input device used on CV & VAV applications

with the comparative enthalpy option. It monitors the return

air humidity level and compares it to the outdoor humidity

level to establish which conditions are best suited to main-

tain the cooling requirements. It is mounted in the return air

section and is connected to the ECEM (1U52).

The LP cutouts are designed to open if the suction pressure

approaches 7 ± 4 psig. If the LP cutout opens after a com-

pressor has started, all compressors operating on that cir-

cuit will be turned off immediately and will remain off for a

minimum of three minutes.

Low Ambient Control

The low ambient modulating output on the compressor

module is functional on all units with or without the low am-

bient option. When the compressor module has staged up

to it's highest stage (stage 2 or 3 depending on unit size),

the modulating output will be at 100% (10 VDC). When the

control is at stage 1, the modulating output (0 to 10 VDC)

will control the saturated condensing temperature to within

the programmable "condensing temperature low ambient

control point".

If the LP cutout trips four consecutive times during the first

three minutes of operation, the compressors on that circuit

will be locked out and a manual reset diagnostic is initiated.

Saturated Condenser Temperature Sensors (2RT1 and

2RT2)

Are analog input devices used on CV & VAV applications

mounted inside a temperature well located on a condenser

tube bend. They monitor the saturated refrigerant tempera-

ture inside the condenser coil and are connected to the

SCM/MCM (1U49). As the saturated refrigerant temperature

varies due to operating conditions, the condenser fans are

cycled "On" or "Off" as required to maintain acceptable op-

erating pressures.

Status/Annunciator Output

Is an internal function within the RTM (1U48) module on CV

& VAV applications that provides;

a. diagnostic and mode status signals to the remote

panel (LEDs) and to the Human Interface.

b. control of the binary Alarm output on the RTM.

Head Pressure Control

c. control of the binary outputs on the GBAS module to

inform the customer of the operational status and/or

diagnostic conditions.

is accomplished using two saturated refrigerant tempera-

ture sensors on CV & VAV applications. During a request

for compressor operation, when the condensing tempera-

ture rises above the "lower limit" of the controlband, the

Compressor Module (SCM/MCM) starts sequencing con-

General Information (Continued)

compressor(s) on that circuit "Off", locks out all compressor

operation for that circuit, and initiates a manual reset diag-

nostic.

Low Ambient Compressor Lockout

Utilizes an analog input device for CV & VAV applications.

When the system is configured for low ambient compressor

lockout, the compressors are not allowed to operate if the

temperature of the outside air falls below the lockout set-

point. When the temperature rises 5 F above the lockout

setpoint, the compressors are allowed to operate. The set-

point for units without the low ambient option is 50 F. For

units with the low ambient option, the setpoint is 0 F. The

setpoints are adjustable at the Human Interface inside the

unit control panel.

Supply AirTemperature Low Limit

Uses the supply air temperature sensor input to modulate

the economizer damper to minimum position in the event

the supply air temperature falls below the occupied heating

setpoint temperature.

Freezestat (4S12)

Is a binary input device used on CV & VAV units with Hy-

dronic Heat. It is mounted in the heat section and con-

nected to the Heat Module (1U50). If the temperature of the

air entering the heating coil falls to 40 F, the normally open

contacts on the freezestat closes signalling the Heat Mod-

ule (1U50) and the Rooftop Module (RTM) to:

a. drive the Hydronic Heat Actuator (4U15) to the full

open position.

Space Pressure Transducer (3U62)

Is an analog input device used on CV & VAV applications

with the Statitrac option. It modulates the exhaust dampers

to keep the space pressure within the building to a cus-

tomer designated controlband. It is mounted in the filter

section just above the exhaust damper actuator and is con-

nected to the ECEM (1U52). Field supplied pneumatic tub-

ing must be connected between the space being controlled

and the transducer assembly.

b. turn the supply fan "Off".

c. closes the outside air damper;

d. turns "On" the SERVICE light at the Remote Panel.

e. initiates a "Freezestat" diagnostic to the Human

Interface.

Transducer Voltage Output vs Pressure Input

4.0

High Duct Temp Thermostats (Optional 3S16, 3S17)

Are binary input devices used on CV & VAV applications

with a Trane Communication Interface Module (TCI). They

provide "high limit" shutdown of the unit and requires a

manual reset. They are factory set to open if the supply air

temperature reaches 240 F, or the return air temperature

reaches 135 F. Once tripped, the thermostat can be reset

by pressing the button located on the sensor once the air

temperature has decreased approximately 25 F below the

cutout point.

3.5

3.0

2.5

2.0

1.5

1.0

0.5

Compressor Circuit Breakers (1CB8, 1CB9, 1CB10,

1CB11 & 1CB14, 1CB15, 1CB16, 1CB17)

The Scroll Compressors are protected by circuit breakers

which interrupt the power supply to the compressors if the

current exceeds the breakers “must trip” value. During a re-

quest for compressor operation, if the Compressor Module

(SCM) detects a problem outside of it's normal parameters,

it turns any operating compressor(s) on that circuit "Off",

locks out all compressor operation for that circuit, and ini-

tiates a manual reset diagnostic.

0.0

-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Pressure (inches w.c.)

Morning Warm-Up - Zone Heat

When a system changes from an unoccupied to an occu-

pied mode, or switches from STOPPED to AUTO, or power

is applied to a unit with the MWU option, the heater in the

unit or external heat will be brought on if the space tem-

perature is below the MWU setpoint. The heat will remain

on until the temperature reaches the MWU setpoint. If the

unit is VAV, then the VAV box/unocc relay will continue to

stay in the unoccupied position and the VFD/IGV output

will stay at 100% during the MWU mode. When the MWU

setpoint is reached and the heat mode is terminated, then

the VAV box/unocc relay will switch to the occupied mode

and the VFD/IGV output will be controlled by the duct static

pressure. During Full Capacity MWU the economizer

damper is held closed for as long as it takes to reach

setpoint. During Cycling Capacity MWU the economizer

damper is allowed to go to minimum position after one

hour of operation if setpoint has not been reached.

Constant Volume (CV) Units

ZoneTemperature - Cooling

Relies on input from a sensor located directly in the space,

while a system is in the occupied "Cooling" mode. It modu-

lates the economizer (if equipped) and/or stages the me-

chanical cooling "On and Off" as required to maintain the

zone temperature to within the cooling setpoint deadband.

Zone Temperature - Heating

Relies on input from a sensor located directly in the space,

while a system is in the occupied "Heating" mode or an un-

occupied period, to stage the heat "on and off" or to modu-

late the heating valve (hydronic heat only) as required to

maintain the zone temperature to within the heating setpoint

deadband. The supply fan will be requested to operate any

time there is a requested for heat. On gas heat units, the

fan will continue to run for 60 seconds after the furnace is

turned off.

Compressor Motor Winding Thermostats (2B7S1,

2B17S2, 2B27S5, 2B8S3, 2B18S4 & 2B28S6)

A thermostat is embedded in the motor windings of each

Scroll compressor. Each thermostat is designed to open if

the motor windings exceeds approximately 221 F. The ther-

mostat will reset automatically when the winding tempera-

ture decreases to approximately 181 F. Rapid cycling, loss

of charge, abnormally high suction temperatures, or the

compressor running backwards could cause the thermostat

to open. During a request for compressor operation, if the

Compressor Module (SCM) detects a problem outside of

it's normal parameters, it turns any operating

Supply AirTempering

On CV units equipped with staged heat, if the supply air

temperature falls 10 F below the occupied heating setpoint

temperature while the heater is "Off", the first stage of heat

will be turned "On". The heater is turned "Off" when the sup-

ply air temperature reaches 10 F above the occupied heat-

ing setpoint temperature.

General Information (Continued)

and the unit will return to discharge air control. If the occ

zone heating setpoint is less than the DWU terminate

setpoint, the heat will turn off when the occ zone heat

setpoint is reached, but it will stay in DWU mode and cycle

the heat to maintain setpoint.

Variable Air Volume (VAV) Units

Occupied Heating - Supply Air Temperature

When a VAV units is equipped with "Modulating Heat", and

the system is in an occupied mode, and the field supplied

changeover relay contacts (5K87) have closed, the supply

air temperature will be controlled to the customer specified

supply air heating setpoint. It will remain in the heating sta-

tus until the changeover relay contacts are opened.

Occupied Cooling - Supply AirTemperature

When a VAV unit is in the occupied mode, the supply air

temperature will be controlled to the customers specified

supply air cooling setpoint by modulating the economizer

and/or staging the mechanical cooling "On and Off" as re-

quired. The changeover relay contacts must be open on

units with "Modulating Heat" for the cooling to operate.

Daytime Warm-up

On VAV units equipped with heat, if the zone temperature

falls below the daytime warm-up initiate temperature dur-

ing the occupied mode, the system will switch to full air-

flow. During this mode, the VAV box/unocc relay, RTM K3,

will be energized (this is to signal the VAV boxes to go to

100%). After the VAV box max stroke time has elapsed

(factory set at 6 minutes), the VFD/IGV output will be set to

100%. The airflow will be at 100% and the heat will be

turned on to control to the occupied heating setpoint.

When the zone temperature reaches the daytime warm-up

termination setpoint, the heat will be turned off, the K3 re-

lay will be de-energized, releasing the VAV boxes, the

VFD/IGV output will go back to duct static pressure control

Unoccupied Heating - ZoneTemperature

When a VAV unit is equipped with gas, electric, or hydronic

heat and is in the unoccupied mode, the zone temperature

will be controlled to within the customers specified setpoint

deadband. During an unoccupied mode for a VAV unit, the

VAV box/unocc relay will be in the unoccupied position and

the VFD/IGV output will be at 100%. This means that if

there is a call for heat (or cool) and the supply fan comes

on, it will be at full airflow and the VAV boxes in the space

will need to be 100% open as signaled by the VAV box/

unocc relay.

Supply AirTempering

On VAV units equipped with "Modulating Heat", if the sup-

ply air temperature falls 10 F below the supply air tempera-

ture setpoint, the hydronic heat valve will modulate to

maintain the supply air temperature to within the low end

of the setpoint deadband.

Supply Duct Static Pressure Control (Occupied)

The RTM relies on input from the duct pressure transducer

when a unit is equipped with Inlet Guide Vanes or a Vari-

able Frequency Drive to position the Inlet Guide Vanes or

set the supply fan speed to maintain the supply duct static

pressure to within the static pressure setpoint deadband.

Refer to the Transducer Voltage Output vs Pressure Input

values listed in the Space Pressure Transducer (3U62)

section.

Unit Component Layout and "Shipwith" Locations

General Information (Continued)

Space Temperature Averaging with Multiple Sensors

Space Temperature Averaging

Space temperature averaging for Constant Volume applica-

tions is accomplished by wiring a number of remote sensors

in a series/parallel circuit.

The fewest number of sensors required to accomplish

space temperature averaging is four. Figure 8 illustrates a

single sensor circuit (Single Zone), four sensors wired in a

series/parallel circuit (Four Zone), nine sensors wired in a

series/parallel circuit (Nine Zone). Any number squared, is

the number of remote sensors required.

Wiring termination will depend on the type of remote panel

or control configuration for the system. Refer to the wiring

diagrams that shipped with the unit.

Unit Control Modules (UCM)

Control Module Locations for S_HF 30 Ton Units

Unit control modules are microelectronic circuit boards de-

signed to perform specific unit functions. These modules

through Proportional/Integral control algorithms provide the

best possible comfort level for the customer. They are

mounted in the control panel and are factory wired to their

respective internal components. They receive and interpret

information from other unit modules, sensors, remote pan-

els, and customer binary contacts to satisfy the applicable

request for economizing, mechanical cooling, heating, and

ventilation. Figure 9 below illustrates the typical location of

each "1U" designated module.

J2-1

RTM

1U48

1TB9

J1-1

ECEM

1U52

J2-1

Bracket

J1-1

1PCB MOD

1U55

SCM

1U49

Bracket

J2-1

Bracket

J2-1

J1-1

Heat MOD

1U50

J1-1

Bracket

Mounting

Plate

Bracket

J2-1

GBAS MOD

1U51

Control Module Locations for S_HF 20 & 25 Ton Units

TCI MOD

1U54

J2-1

J1-1

Mounting

Plate

LCI MOD

1U54

SCM

1U49

VOM

1U53

Bracket

J2-1

J1-1

Bracket

J2-1

Heat MOD

1U50

J1-1

RTM

1U48

Mounting

Plate

J2-1

J1-1

J2-1

Bracket

J1-1

1TB9

TCI MOD

1U54

Bracket

ECEM

1U52

LCI MOD

1U54

J1-1

1PCB MOD

1U55

J2-1

GBAS MOD

1U51

Mounting ^J1-1

Plate

VOM

1U53

J1-1

Bracket

J2-1

Mounting

Plate

J1-1

General Information (Continued)

Control Module Locations for S_HF 40, 60, 70 &

75 Ton Units

Control Module Locations for S_HF 50 & 55 Ton Units

MCM

1U49

J2-1

MCM

Bracket

1U49

J1-1

J2-1

RTM

Heat MOD

1U50

1U48

Bracket

Heat MOD

TCI MOD

1U54

RTM

1U48

J1-1

Mounting

Plate

Bracket

1U50

J1-1

LCI MOD

1U54

J2-1

Bracket

Mounting

Plate

J2-1

J1-1

1TB9

J1-1

LCI MOD

Bracket

TCI MOD

1U54

J1-1

1TB9

J2-1

ECEM

1U52

J1-1

Bracket

1U54

1PCB MOD

1U55

J1-1

Bracket

J2-1

J1-1

Bracket

J2-1

J1-1

J2-1

J1-1

Mounting

Plate

ECEM

1U52

J1-1

Mounting

Plate

J2-1

J1-1

Bracket

J2-1

Bracket

1PCB MOD

1U55

GBAS MOD

1U51

J2-1

GBAS MOD

1U51

Mounting

Plate

J1-1

Mounting

Plate

VOM

1U53

VOM

1U53

Control Module Locations for S_HG 90 - 130 Ton Units