Trane Odyssey 6 To 25 Tons Installation And Maintenance Manual Split System Air Conditioners

: Trane Trane-Odyssey-6-To-25-Tons-Installation-And-Maintenance-Manual-684224 trane-odyssey-6-to-25-tons-installation-and-maintenance-manual-684224 trane pdf

Open the PDF directly: View PDF .
Page Count: 40

Download
Open PDF In Browser	View PDF

Installation, Operation,
and Maintenance

Split System Air Conditioners
Odyssey™
™
R-22 Dry Charge
Cooling Condenser — 7.5, 10, 15 and 20 Tons
(60 Hz)
TTA090A***G*
TTA120A***G*
TTA180B***G*
TTA240B***G*

S A F E T Y WA R N I N G
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and
air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered
equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the
literature and on the tags, stickers, and labels that are attached to the equipment.

January 2014

SS-SVX12C-EN

Introduction
Read this manual thoroughly before operating or
servicing this unit.

Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required. Your personal safety and the proper
operation of this machine depend upon the strict
observance of these precautions.
The three types of advisories are defined as follows:

WARNING

CAUTION

NOTICE

Indicates a potentially hazardous situation
which, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation
which, if not avoided, could result in minor or
moderate injury. It could also be used to alert
against unsafe practices.
Indicates a situation that could result in
equipment or property-damage only
accidents.

Important Environmental Concerns
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are
refrigerants that contain Chlorine, Fluorine and Carbon
(CFCs) and those containing Hydrogen, Chlorine,
Fluorine and Carbon (HCFCs). Not all refrigerants
containing these compounds have the same potential
impact to the environment. Trane advocates the
responsible handling of all refrigerants-including
industry replacements for CFCs such as HCFCs and
HFCs.

Important Responsible Refrigerant
Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the
air conditioning industry. All technicians who handle
refrigerants must be certified. The Federal Clean Air Act
(Section 608) sets forth the requirements for handling,
reclaiming, recovering and recycling of certain
refrigerants and the equipment that is used in these
service procedures. In addition, some states or
municipalities may have additional requirements that
must also be adhered to for responsible management
of refrigerants. Know the applicable laws and follow
them.

©2014 Trane

All rights reserved

WA R N I N G
Prope r Fi el d Wi ring a nd Groundi ng
Required!
Fa il u re to f ol lo w c ode c o ul d r es u lt i n de at h or
s e r i o u s i n j u r y.
All field w ir in g MUST be p er for med b y qualif ied
per sonnel. Improperly installed and grounded
field wiring poses FIRE and ELECTROCUTION
h a z a r d s . To a v o i d t h e s e h a z a r d s , y o u M U S T f o l l o w
requirements for field wiring installation and
grounding as described in NEC and your local/
state electrical codes.

WA R N I N G
Pe r s o n a l P r o t e c t i v e E q u i p m e n t ( P P E )
Required!
Fa il u re to w ea r pro pe r PPE f or t he j ob b ei ng
u n d e rt a k e n c o u l d r e s u l t i n d e a t h o r s e r i o u s i n j u r y.
Te ch n i c i a n s , i n o r d e r t o p r o t e c t t h e m s e l v e s f r o m
p o t e n t i a l e l e c t r i c a l , m e ch a n i c a l , a n d ch e m i c a l
h azards, MUST follow pr ecaut io ns in th is man ual
a n d o n t h e t a g s , s t i ck e r s , a n d l a b e l s , a s w e l l a s t h e
instructions below:
•

Before installing/servicing this unit,
t e ch n i c i a n s M U ST p u t o n a l l Pe r s o n a l
Pr o t e c t i v e E q u i p m e n t ( P P E ) r e c o m m e n d e d
f o r t h e w o r k b e i n g u n d e rt a k e n . A LWAY S r e f e r
to appropriate MSDS sheets and OSHA
guidelines for proper PPE.

•

When working with or around hazardous
ch e m i c a l s , A LWAY S r e f e r t o t h e a p p r o p r i a t e
MSDS sheets and OSHA guidelines for
in for mat io n on a ll owa bl e pe r s ona l e x pos ur e
levels, proper respiratory protection and
handling recommendations.

•

I f t h e r e i s a r i s k o f a r c o r f l a s h , t e ch n i c i a n s
M U S T p u t o n a l l Pe r s o n a l P r o t e c t i v e
E q u i p m e n t ( P P E ) i n a c c o r d a n c e w i t h N F PA
7 0 E o r o t h e r c o u n t r y- s p e c i f i c r e q u i r e m e n t s
for arc flash protection, PRIOR to servicing
the unit.

SS-SVX12C-EN

Introduction

WA R N I N G
Re f r i g e r a n t u n de r H i g h Pr e s s u r e !
Fai l ure t o fol l ow i ns tr uc ti on s be l ow c ou ld re s ul t in
a n e x p l o s i o n w h i ch c o u l d r e s u l t i n d e a t h o r s e r i o u s
injury or equipment damage.
Sy s t e m c o n t a i n s o i l a n d r e f r i g e r a n t u n d e r h i g h
pre ssu re . Recove r r ef ri ge ra nt to re li e ve pre ssu re
befor e op en in g t he system. See u nit namep late for
re fri ge ra nt ty pe . Do no t u se non -a pp rove d
refrigerants, refrigerant substitutes, or refrigerant
additi ves.

Copyright

in whole or in part, without the written permission of
Trane. Trane reserves the right to revise this publication
at any time and to make changes to its content without
obligation to notify any person of such revision or
change.

Trademarks
All trademarks referenced in this document are the
trademarks of their respective owners.

Revision History
Removed warranty chapter, updated with running
edits.

This document and the information in it are the
property of Trane and may not be used or reproduced

SS-SVX12C-EN

3

Table of Contents
Model Number Description . . . . . . . . . . . . . . . . . 6
Cooling Condenser . . . . . . . . . . . . . . . . . . . . . . . 6

General Information . . . . . . . . . . . . . . . . . . . . . . . . 7
Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Inspection Checklist . . . . . . . . . . . . . . . . . . . 8
Testing for Leaks. . . . . . . . . . . . . . . . . . . . . . . . . . 8

28
28
28
28
28
28
28

Lifting Recommendations . . . . . . . . . . . . . . . . . 8

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electromechanical Controls. . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator Fan (Indoor Supply
Air) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Mode . . . . . . . . . . . . . . . . . . . . . . .

29
29

ReliaTel™ Controls . . . . . . . . . . . . . . . . . . . . . .
Control Cooling Mode . . . . . . . . . . . . . . . .
Control Evaporator Fan
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Heating Operation . . . . . . . . . . . .

29
29

Unit Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Structural Preparation . . . . . . . . . . . . . . . . .
Rooftop Mounting . . . . . . . . . . . . . . . . . . . .
Ground Level Mounting . . . . . . . . . . . . . . .

9
9
9
9

Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . 10
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cooling Condenser . . . . . . . . . . . . . . . . . . . . . . 14

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Refrigerant Piping Guidelines. . . . . . . . . . . . . 15
Refrigerant Piping Procedures (Outdoor
Units). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Refrigerant Piping Procedures (Indoor
Unit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

29
29

30
30

Service Test Modes for ReliaTel™
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Test Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step Test Mode . . . . . . . . . . . . . . . . . . . . . .
Resistance Test Mode . . . . . . . . . . . . . . . .
Auto Test Mode . . . . . . . . . . . . . . . . . . . . . .

31
31
31
31

Leak Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
System Evacuation. . . . . . . . . . . . . . . . . . . 17

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Insulating and Isolating Refrigerant
Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

System Status Checkout Procedure . . . . . . . 32
Method 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Method 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Refrigerant Charging Procedure . . . . . . . . . . 18
Liquid Charging . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Power Supply . . . . . . . . . . . . . . . . . . .
Low Voltage Wiring . . . . . . . . . . . . . . . . . .
Electromechanical Controls . . . . . . . . . . .
ReliaTel™ Controls . . . . . . . . . . . . . . . . . . .
Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Circuit. . . . . . . . . . . . . . . . . . . .

19
20
20
20
20
21
24

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Charging Charts and Superheat . . . . . . . . . . . 26
Installation Checklist. . . . . . . . . . . . . . . . . . . . . . . 27
Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . 27
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 27

Pre-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4

Control Circuit Features . . . . . . . . . . . . . . . . . .
Discharge Temperature Limit
(DTL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Outdoor Ambient Cooling . . . . . . . .
Evaporator Defrost Control
(EDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Pressure Cut-Out (LPCO) . . . . . . . . .
High Pressure Cut-Out (HPCO) . . . . . . . .
Internal Overload Protector
(IOL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting ReliaTel™ Controls. . . . . . . 32

Resetting Cooling and Heating
Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Method 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Method 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Zone Temperature Sensor (ZTS) Service
Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Temperature Tests . . . . . . . . . . . . . . . . . . . . . . .
Test 1 - Zone Temperature
Thermistor (ZTEMP). . . . . . . . . . . . . . . . . .
Test 2 - Cooling Set Point (CSP) and
Heating Set Point (HSP). . . . . . . . . . . . . . .
Test 3 - System Mode and Fan
Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test 4 - LED Indicator Test (SYS ON,
HEAT, & COOL). . . . . . . . . . . . . . . . . . . . . . .

34
34
34
34
35

Programmable & Digital Zone Sensor
Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SS-SVX12C-EN

Ta b l e o f C o n t e n t s

Testing Serial Communication
Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
RLCI Loss of Communications. . . . . . . . . 35

Maintenance Log . . . . . . . . . . . . . . . . . . . . . . . . 37

Wiring Diagram Matrix . . . . . . . . . . . . . . . . . . . . 38

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Monthly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Annually (Cooling Season) . . . . . . . . . . . . . . . 36
Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

SS-SVX12C-EN

5

Model Number Description
Cooling Condenser
TTA

120

A

3

00

*

*

123

456

7

8

9 10

11

12

All products are identified by a multiple-character
model number that precisely identifies a particular type
of unit. An explanation of the alphanumeric
identification code is provided. Its use will enable the
owner/operator, installing contractors, and service
engineers to define the operation, specific
components, and other options for any specific 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 nameplate.

180 = 15 Tons (60Hz)
240 = 20 Tons (60Hz)
D I G I T 7 : M a j o r D e v e l o p m e n t Se q u e n c e
A = Single Compressor, Single Circuit, R-22
B = Dual Compressor, Dual Circuit, R-22
DIGIT 8: Electrical Characteristics
3 = 208–230/60/3
4 = 460/60/3
D I G I T S 9 - 10 : F a c t o r y I n s t a l l e d O p t i o n s

D I G I T S 1 - 3 : Pr o d u c t Ty p e

00 = Packed Stock

TTA = Split System Cooling

D I G I T S 11 : M i n o r D e s i g n S e q u e n c e

DIGITS 4 - 6: Nominal Gross Cooling Capacity
(MBh)

* = Current Design Sequence1

090 = 7.5 Tons (60Hz)
120 = 10 Tons (60Hz)

* = Current Design Sequence1

1.

6

D I GI TS 12 : Serv i c e D ig it

* = sequential alpha character

SS-SVX12C-EN

General Information
This manual describes proper installation, operation,
and maintenance procedures for air-cooled systems. By
carefully reviewing the information within this manual
and following the instructions, the risk of improper
operation and/or component damage will be
minimized. It is important that periodic maintenance be
performed to help assure trouble free operation.
Should equipment failure occur, contact a qualified
service organization with qualified, experienced HVAC
technicians to properly diagnose and repair this
equipment.
I m p o rt a n t : All phases of this installation must comply
with the NATIONAL, STATE & LOCAL
CODES. In addition to local codes, the
installation must conform with National
Electric Code -ANSI/NFPA NO. 70 LATEST
REVISION.
Any individual installing, maintaining, or servicing this
equipment must be properly trained, licensed and
qualified.
I m p o rt a n t : Do not remove the VFD without first
contacting technical support! For
performance-related questions and
diagnostic support in North America call 1877-872-6363. Any return requires a claim
number FIRST. Removal of the VFD prior to
this step will void the unit’s warranties.
Installation procedures should be performed in the
sequence that they appear in this manual. Do not
destroy or remove the manual from the unit. The

SS-SVX12C-EN

manual should remain weather-protected with the unit
until all installation procedures are complete.
N o t e : It is not the intention of this manual to cover all
possible variations in systems that may occur or
to provide comprehensive information
concerning every possible contingency that may
be encountered during an installation. If
additional information is required or if specific
problems arise that are not fully discussed in this
manual, contact your local sales office.
Use the ”Installation Checklist,” p. 27 provided In this
manual to verify that all necessary installation
procedures have been completed. Do not use the
checklist as a substitute for reading the information
contained in the manual. Read the entire manual
before beginning installation procedures.

Unit Description
These condensers come with single and dual
compressor options. Single compressor outdoor units
feature a single refrigeration circuitry, requiring only
one set of refrigerant lines. Dual compressor/dual
circuit models give true stand-by protection; if one
compressor fails, the second will automatically startup. Also, the first compressor can be serviced without
shutting down the unit since the refrigerant circuits are
independent. During light load conditions, only one
compressor will operate to save energy.

7

Pre-Installation
Unit Inspection
Inspect material carefully for any shipping damage. If
damaged, it must be reported to, and claims made
against the transportation company. Compare the
information that appears on the unit nameplate with
ordering and submittal data to ensure the proper unit
was shipped. Available power supply must be
compatible with electrical characteristics specified on
component nameplates. Replace damaged parts with
authorized parts only.

Inspection Checklist
To protect against loss due to damage incurred in
transit, complete the following checklist upon receipt of
the unit.
Inspect individual pieces of the shipment before
accepting the unit. Check for obvious damage to the
unit or packing material.
Inspect the unit for concealed damage before it is
stored and as soon as possible after delivery.
Concealed damage must be reported within 15
days. If concealed damage is discovered, stop
unpacking the shipment. Do not remove damaged
material from the receiving location. Take photos of
the damage if possible. The owner must provide
reasonable evidence that the damage did not occur
after delivery.
Notify the carrier’s terminal of damage immediately
by phone and by mail. Request an immediate joint
inspection of the damage by the carrier and the
consignee.
Notify the sales representative and arrange for
repair. Do not repair the unit until the damage is
inspected by the carrier’s representative.

Testing for Leaks
All units are shipped with a holding charge of nitrogen
in each circuit and should be leak tested before
installation.
1. Remove the access panel.
2. Locate the liquid line or suction line access valve for
each circuit.
3. Install gauges to determine if the circuits are still
pressurized. If not, the charge has escaped and
should be repaired as required to obtain a leak-free
circuit.

Lifting Recommendations
WA R N I N G
I m p r o p e r U n i t L i ft !
F a i l u r e t o p r o p e r l y l i ft u n i t c o u l d r e s u l t i n u n i t
dropping and possibly crushing operator/
t e ch n i c i a n w h i ch c o u l d r e s u l t i n d e a t h o r s e r i o u s
i n j u r y, a n d e q u i p m e n t o r p r o p e rt y- o n l y d a m a g e .
Te s t l i ft u n i t a p p r o x i m a t e l y 2 4 i n ch e s t o v e r i f y
p r o p e r c e n t e r o f g r a v i t y l i ft p o i n t . To a v o i d
d r o p p i n g o f u n i t , r e p o s i t i o n l i ft i n g p o i n t i f u n i t i s
not level.

N OT I C E
Equipment Damage!
Use spreader bar s to prevent straps from
d a m a g i n g t h e u n i t . I n s t a l l t h e b a r s b e t w e e n l i ft i n g
s t r a p s , b o t h u n d e r n e a t h t h e u n i t a n d a b ov e t h e
unit to prevent the straps from crushing the unit
cabinet or damaging the finish.
Before preparing the unit for lifting, estimate the
approximate center of gravity for lifting safety. Because
of placement of internal components, the unit weight
may be unevenly distributed. See ”Weights”, p. 14 for
approximate unit weights.
The crated unit can be moved using a forklift of suitable
capacity. For lifting the unit, attach lifting straps or
slings securely to the lifting holes at each corner (see
unit drawings in ”Weights”, p. 14). Use spreader bars to
protect the unit casing from damage. Test lift the unit to
determine proper balance and stability.

Clearances
Provide enough space around the unit to allow
unrestricted access to all service points. Refer to the
”Dimensional Data,” p. 10 for unit dimensions and
minimum required service and free air clearances.
Observe the following points to ensure proper unit
operation.
1. Do not install the unit under a low overhang.
Condenser discharge must not be restricted—refer
to notes in ”Dimensional Data drawings,” p. 10.
I m p o rt a n t : Do not obstruct condenser discharge
air. This can result in warm air
recirculation through the coil.
2. Do not locate the unit in a position where runoff
water can fall into the fan discharge openings.
3. Condenser intake air is supplied from three or four
sides of the unit. Adhere to the minimum required
clearances given in unit dimensional drawings (see
”Dimensional Data,” p. 10).

8

SS-SVX12C-EN

Pre-Installation

Unit Mounting
WA R N I N G
Mounting Integrity!
Fai l ure t o fol l ow i ns tr uc ti on be l ow c ou ld r es ul t i n
death or serious injury or possible equipment or
p r o p e rt y- o n l y d a m a g e .
E n s u r e t h e r o o f s t r u c t u r e s u p p o rt s a r e s t r o n g
e n o u g h t o s u p p o rt t h e w e i g h t o f t h e u n i t a n d a n y
accessories.

Figure 1. Roof mounted unit
Ou td o o r Un it
Ga s (S u ctio n )
Lin e - In s u la te d
Liq u id Lin e
In s u la te d
Un it Mo u n tin g
Ch a n n e ls

6”
Ra d iu s

Ele va tio n
(Mo u n tin g Fra m e )

Structural Preparation

N OT I C E
Ro o f D a m a g e !
Sy s t e m c o n t a i n s o i l a n d r e f r i g e r a n t u n d e r h i g h
pressu re. Roof s shou ld b e pr otected fro m
exposure to oils and refrigerant in the system. If
r o o ft o p i s n o t p r o t e c t e d , d a m a g e t o t h e r o o f m a y
o c c u r.
I m p o rt a n t : Refer to local building codes for proper
installation. All installation must comply
with local building codes.

Rooftop Mounting
If the unit will be roof mounted, determine for certain
that the structure is strong enough to support the unit
and any required accessories, see ”Weights”, p. 14. The
unit should be elevated on a level, field fabricated fourinch steel or wood 4" x 4" mounting frame. Complete
the frame and secure it into position before lifting the
unit to the roof. The mounting frame must support a
minimum of three of the unit’s four sides and should
span roof supports to distribute the load on the roof.

SS-SVX12C-EN

Ro o f
Co n s tru ctio n
Ro o f Tru s s in g

Ce ilin g

Ground Level Mounting
For ground level installation, the unit base should be
adequately supported and hold the unit near level. The
installation must meet the guidelines set forth in local
codes. The support should extend two inches beyond
the unit base channels at all points. The unit and
support must be isolated from any adjacent structure to
prevent possible noise or vibration problems. Any
ground level location must comply with required
clearances given in the unit dimensional drawings (see
”Dimensional Data,” p. 10).

9

Dimensional Data
Figure 2. Height, width and depth measurements

H
H
W
D

D

W

H - in. (mm)

W - in. (mm)

D - in. (mm)

TTA090A

39.125 (993.8)

42.125 (1070)

36 (914.4)

TTA120A

39.125 (993.8)

52.125 (1324)

40 (1016)

TTA 156, 180, 201, 240TTA180B, 240B

45.125 (1146.1)

95.5 (2425.7)

45.875 (1165.2)

N o t e : Full dimensional data available on next pages.

10

SS-SVX12C-EN

Dimensional Data

Figure 3. 7.5 ton condensing unit, single compressor
SEE NOTE 3
NOTES :
1. ACCES S OP ENING IS FOR FIELD INS TALLED BAYLOAM ACCES S ORY.
2. MINIMUM CLEARANCE FOR P ROP ER OP ERATION IS 36" (914.4) FROM
W ALLS , S HRUBBERY, P RIVACY FENCES ETC. MINIMUM CLEARANCE
B ETWEEN ADJ ACENT UNITS IS 72" (1828.8). RECOMMENDED S ERVICE
C LEARANCE 48" (1219. 2)
3. TOP DIS CHARGE AREA S HOULD BE UNRES TRICTED FOR 100" (2540)
MINIMUM. UNIT S HOULD BE P LACED S O ROOF RUN-OFF WATER DOES
NOT P OUR DIRECTLY ON UNIT
4. OUTDOOR AIR TEMP ERATURE S ENS OR OP ENING (DO NOT BLOCK OP ENING)

SERVICE PANEL

SEE NOTE 4
HAIL GUARD
(OP TIONAL)

S ERVICE CLEARANCE
48" (1219.2) (S EE NOTE 2
FOR CLEARANCE)
HAIL GUARD
(OP TIONAL)

S EE NOTE 1
35 15/1 6"
(912 .8)
WITH HAIL GUARD
33 7/8"
(86 0.4)

LINE VOLTAGE
CONT ROL WIRING

REFRIGERANT ACCES S

39 3/16"
(995.3)

SER VICE P ANEL
34 1/8" (866.8)

26 15/16"
(684.2)

29 13/16"
(757.2)
16 7/16"
(417.5)

14 3/8"
(365.1)
1/16"
(1.59)

7 15/16"
(201.6)

6" (152.4)
6" (152.4)

SUCTION LINE

1 7/8"
(47.6)

21 11 /16"
(55 0.9)

LIQUID LINE

2 7/8"
(73)

33 13/1 6"
(858 .8)

40 15/16"
(1039.8)
41 15/16"
(1065. 2)
WITH HAIL GUARD

SERVIC E P ANEL S IDE
3" (76. 2)

40 3/4"
(1035) 34 3/4"
(882.6)

7/16" (11.11) DIA. IS OLATOR MOUNTING
HOLES (OUTS IDE HOLES - 4 P LACES )

BOTTOM
OF UNIT

4 3/16"
(106.36)
1 13/16"
(46)

SS-SVX12C-EN

27 11/ 16"
(703.3 )

2 5/16"
(58.7)

11

Dimensional Data

Figure 4. 10 ton condensing unit, single compressor
SEE NOTE 3

NOTES :
1. ACCES S OP ENING IS FOR FIELD INS TALLED BAYLOAM ACCES S ORY.
2. MINIMUM CLEARANCE FOR P ROP ER OP ERATION IS 36" (914.4) FROM
WALLS , S HRUBBERY, P RIVACY FENCES ETC. MINIMUM CLEARANCE
B ETWEEN ADJ ACENT UNITS IS 72" (1828.8). RECOMMENDED S ERVICE
C LEARANCE 48" (1219.2)
3. TOP DIS CHARGE AREA S HOULD BE UNRES TRICTED FOR 100" (2540)
MINIMUM. UNIT S HOULD BE P LACED S O ROOF RUN-OFF WATER DOES
NOT P OUR DIRECTLY ON UNIT
4. OUTDOOR AIR TEMP ERATURE S ENS OR OP ENING (DO NOT BLOCK OP ENING)

SERVICE PANEL

HAIL GUARD
(OP TIONAL)

SEE NOTE 4

S ERVICE CLEARANCE
48" (1219.2) (S EE NOTE 2
FOR CLEARANCE
S EE NOTE 1

4 1/4"
(108)

HAIL GUARD
(OP TIONAL)

39 15 /16"
(1014 .4)
WITH HAIL GUARD
1 1/4"
(31.7)

REFRIGERANT ACCES S

37 15/1 6"
(963 .6)

LINE VOLTAGE
CONTROL WIRING

39 1/8"
(993.8)

SER VICE P ANEL
34 1/16" (865.2)
29 3/4"
(755.6)

26 7/8"
(682.6)
14 5/16"
(363.5)

7 1/2" 8 1/4"
(190.5) (209.5)
1/16"
(1.6)

SUCTION LINE

25 11/1 6"
(652 .5)

6"
(152. 4)

1 15/16" (49.2)
LIQUID LINE
4 15/16"
(125.4)

6"
(152. 4)

1 7/8"
(47.6)
2 7/8" (73)
50 15/16"
(1294)
51 15/16"
(1319.2)
WITH HAIL GUARD

37 11/1 6"
(957 .3)

SERVICE P ANEL S IDE
7/16" (11.1) DIA. IS OLATOR MOUNTING
HOLES (OUTS IDE HOLES - 4 P LACES )

3" (76. 2)

50 3/4"
(1289)

44 3/4"
(1136.6)

BOTTOM
OF UNIT

3 13/16"
(96.8)
2 3/16"
(55.6)

12

31 11/1 6"
(804.9)

1 11/16"
(42.9)

SS-SVX12C-EN

Dimensional Data

Figure 5. 15, 20 ton condensing unit, dual compressor

SEE NOTE 2

NOTES :
1. MINIMUM CLEARANCE FOR P ROP ER OP ERATION IS 36" (914.4) FROM
WALLS , S HRUBBERY, P RIVACY FENCES ETC. MINIMUM CLEARANCE
B ETWEEN ADJ ACENT UNITS IS 72" (1828.8). RECOMMENDED S ERVICE
C LEARANCE 48" (1219.2)
2. TOP DIS CHARGE AREA S HOULD BE UNRES TRICTED FOR 100" (2540)
MINIMUM. UNIT S HOULD BE P LACED S O ROOF RUN-OFF WATER DOES
NOT P OUR DIRECTLY ON UNIT
3. OUTDOOR AIR TEMP ERATURE S ENS OR OP ENING (DO NOT BLOCK OP ENING)

HAIL GUARD
(OP TIONAL)
SEE NOTE 3

S ERVICE CLEARANCE
48" (1219.2) (S EE NOTE 1
FOR CLEARANCE)

SERVICE PANEL

DETAIL A

46"
(1168.4)
WITH HAIL GUARD

95 7/16"
(2424)
WITH HAIL GUARD
41 7/16"
(1052.5)

44"
(1117. 6)
HAIL GUARD
(OP TIONAL)

HAIL GUARD
(OP TIONAL)

45 1/8"
(1146.2)

SER VICE
P ANEL

3 3/8"
(85.7)
6 5/8"
(168.3)

1/16"
(1.6)

3/16"
(4.8)
41 3/8"
(1051)

9"
(228.6)

93 5/16"
(2370.1)

25 11/16"
(652.5)

9"
(228. 6)

9 1/4" (235)
6 13/16" (173)
1 3/16" (30.2)

7/16" (11.1) DIA. ISOLATOR MOUNTING
HOLES (OUTS IDE HOLES - 4 P LACES )

LINE VOLTAGE

CONTROL
WIRING

SERVICE PANEL SIDE
S UCTION LINE
REFRIGERANT ACCES S
39 7/8"
(1012.8)
BOTTOM OF UNIT
36 7/8"
(936.6)

3" (76. 2)
87"
(2210)
93"
(2362.2)

2 3/16" 6 13/16"
(55.6) (173)

41 1/ 2"
(105 4)

41 5/8"
(1057.3)

18 3/4"
(476.2) 14 5/8"
(371.5)
12 9/16"
(319.1)
5 9/16"
4 3/8"
(141.3)
(111.1)
S UCTION LINE

LIQUID LINES

6 5/16" (160.3)
3 11/16" (93.7)
15/16" (23.8)

FRO NT DETAIL A
DIMENS IONAL DETAIL

SS-SVX12C-EN

13

Weights
Cooling Condenser
Table 1.

TTA unit and corner weights — lbs (60 Hz)

Tons

Model No.

Shipping Max
(lbs)

Net Max (lbs)

7.5

TTA090A

363

10

TTA120A

15

TTA180B

20

TTA240B

Corner Weights
1

2

3

4

298

84

89

44

81

467

395

133

103

70

89

850

723

207

204

151

161

970

837

262

240

164

171

Figure 6. TTA090A, 120A

Figure 7.

TTA180B, 240B
#4

#3

#4

#1

#1
#3

#2
S ER
AC C VIC E
ES S

#2
S ER
AC C VIC E
ES S

S ER
AC C VIC E
ES S

LIFTING HOLES
(BOTH S IDES )

LIFTING HOLES (BOTH S IDES )

14

SS-SVX12C-EN

Installation
Refrigerant Piping Guidelines
Figure 8. Allowable elevation difference: Cooling only TTA above indoor unit
Contact m an ufacturer for review

Figure 9. Allowable elevation difference: TTA below indoor unit
Contact m anufacturer for review

Accep tab le liq uid -riser heig ht
b ased on total liq uid -lin e len g th
(TTA b elow ind oor un it)

N o t e : Route refrigerant piping for minimum linear length, minimum number of bends and fittings (no reducers) and
minimum amount of line exposed to outdoor ambients.

SS-SVX12C-EN

15

Installation

Refrigerant Piping Procedures
(Outdoor Units)
WA R N I N G
R - 4 10 A R e f r i g e r a n t u n d e r H i g h e r
Pr e s s u r e t h a n R - 2 2 !
Fai l ure t o us e pr ope r eq ui pm e nt o r c om p on en ts a s
de sc ri b ed be l ow, c ou ld re s ul t i n e qu i pme nt fa i li ng
a n d p o s s i b l y e x p l o d i n g , w h i ch c o u l d r e s u l t i n
d e a t h , s e r i o u s i n j u r y, o r e q u i p m e n t d a m a g e .
T h e u n i t s d e s c r i b e d i n t h i s m a n u a l u s e R - 4 10 A
r e f r i g e r a n t w h i ch o p e r a t e s a t h i g h e r p r e s s u r e s
t h a n R - 2 2 . U s e O N LY R - 4 10 A r a t e d s e r v i c e
eq ui pm e nt or c om p one nt s w it h the s e un it s. For
s p e c i f i c h a n d l i n g c o n c e r n s w i t h R - 4 10 A , p l e a s e
c o n t a c t y o u r l o c a l Tr a n e r e p r e s e n t a t i v e .
Each TTA unit ships with a holding charge of dry
nitrogen. The nitrogen should be removed and the
entire system evacuated (at the proper time) to avoid
possible contamination.
1. Remove the compressor service access panel.
2. Locate the liquid and suction line service valves.
Check that the piping connection stubs on the
valves (Figure 10, p. 16) line up properly with the
holes in the unit cabinet.
Figure 10. Outdoor units - refrigerant piping (with dry
nitrogen)

N OT I C E
Syste m Component Dam age!
Do no t remov e th e sea l ca ps f rom re fr ig era nt
connections, or open the service valves until
p r ep ar ed t o b r a ze r e f r ig er an t li n e s t o t h e
connections. Excessi ve exposure to atmosphere (>
5 m i n . ) m a y a l l o w m o i s t u r e o r d i rt t o c o n t a m i n a t e
the system, damaging valve seals and causing ice
formation in system components.

WA R N I N G
Hazard of Explosion and Deadly
Gases!
Fa il u re to f ol lo w a ll pro pe r s af e re fr ig era nt
handling practices could result in death or serious
i n j u r y.
N e v e r s o l d e r, b r a z e o r w e l d o n r e f r i g e r a n t l i n e s o r
a ny uni t comp one nt s th at a re a bov e a tmosp he ric
pressure or where refrigerant may be present.
Al way s re move re fri ge ra nt by fol l ow in g t he
g u i d e l i n e s e s t a b l i s h e d b y t h e E PA F e d e r a l C l e a n
Air Act or other state or local codes as appropriate.
A ft e r r e f r i g e r a n t r e m o v a l , u s e d r y n i t r o g e n t o
b r i n g s y s t e m b a ck t o a t m o s p h e r i c p r e s s u r e b e f o r e
opening system for repair s. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessi ve heat from
soldering, brazing or welding with refrigerant
v a p o r s p r e s e n t c a n f o r m h i g h l y t ox i c ga s e s a n d
e x t r e m e l y c o rr o s i v e a c i d s .
4. Cut, fit and braze tubing, starting at the outdoor unit
and work toward the indoor unit. See
recommended tube sizes, Table 3, p. 18.
N o t e : Use long radius ells for all 90° bends.
All brazing should be done using a 2 to 3 psig dry
nitrogen purge flowing through the pipe being
brazed, see Figure 10, p. 16.

N OT I C E
Syste m Component Dam age!
Install a regulating valve between the nitrogen
s o u r c e a n d t h e ga u g e m a n i f o l d . U n r e g u l a t e d
pressure can damage system components.
3. Remove the refrigerant connection seal caps and
open the service valve slowly to release the
nitrogen from the unit.

N OT I C E
Syste m Component Dam age!
We t - w r a p a l l v a l v e s a n d p r o t e c t p a i n t e d s u r f a c e s
from excessi ve heat. Heat can damage system
components and the unit finish.
5. Shut off nitrogen supply. Shut off the manifold
valve for the line that is connected to the suction
line service valve. Disconnect the line from the
gauge port on the valve.

16

SS-SVX12C-EN

Installation

Refrigerant Piping Procedures
(Indoor Unit)
Once liquid and suction lines are complete to the
refrigerant connections on the indoor unit, remove the
gauge port core(s) on the indoor unit connection stubs
to release the dry nitrogen charge.

N OT I C E
Unit Damage!
Do n ot a ppl y h ea t to re move se al ca ps un ti l th e
ga u g e p o rt c o r e s h a v e b e e n r e m o v e d . I f s e a l c a p s
are intact, application of heat may generate
excessi ve pressure in the unit and result in
damage to the coil or expansion valve.
1. Remove both seal caps from the indoor unit
connection stubs.

N OT I C E
Unit Damage!
Do n ot re move the se a l cap s fr om r ef ri ge ra nt
connections, or open the service valves until
prepared to braze refrigerant lines to the
connections.

WA R N I N G
Hazard of Explosion!
Fa il u re to f ol lo w re co m m en de d s af e le a k te s t
procedures could result in death or serious injury
o r e q u i p m e n t o r p r o p e rt y- o n l y - d a m a g e .
N e v e r u s e a n o p e n f l a m e t o d e t e c t ga s l e a k s . U s e a
leak test solution for leak testing.
After the brazing operation of refrigerant lines to both
the outdoor and indoor unit is completed, the field
brazed connections must be checked for leaks.
Pressurize the system through the service valve with
dry nitrogen to 200 psi. Use soap bubbles or other leakchecking methods to ensure that all field joints are leak
free. If not, release pressure, repair and repeat leak test.

System Evacuation
1. After completion of leak check, evacuate the
system.
2. Attach appropriate hoses from manifold gauge to
gas and liquid line pressure taps.
N o t e : Unnecessary switching of hoses can be
avoided and complete evacuation of all lines
leading to sealed system can be
accomplished with manifold center hose and
connecting branch hose to a cylinder of R–22
and vacuum pump.

2. Turn on nitrogen supply. Nitrogen enters through
the liquid line gauge port.
3. Braze the liquid line connections.
4. Open the gauge port on the suction line and then
braze the suction line to the connection stub.
Nitrogen will bleed out the open gauge port on the
suction line.
5. Shut off nitrogen supply.

Leak Check
WA R N I N G
Hazard of Explosion!
Fai l ure t o fol l ow t he se rec o m m en da ti ons c oul d
result in death or serious injury or equipment or
p r o p e rt y- o n l y d a m a g e .
Use only dry nitrogen with a pressure regulator for
pre ssu ri zin g uni t. Do n ot use a ce ty le ne , ox yg en or
compressed air or mixtures containing them for
pressure testing. Do not use mixtures of a
hy d r o g e n c o n t a i n i n g r e f r i g e r a n t a n d a i r a b ov e
atmospheric pressure for pressure testing as they
may become flammable and could result in an
e x p l o s i o n . Re f r i g e r a n t , w h e n u s e d a s a t r a c e ga s
should only be mixed with dry nitrogen for
pressurizing units.

3. Attach center hose of manifold gauges to vacuum
pump.

N OT I C E
O p e r a t i n g U n d e r Va c u u m !
Do not operate or apply power to the compressor
w hi le und er a v a cu um . Fa i lu re to f ol lo w th es e
instructions will result in compressor failure.
4. Evacuate the system to hold a 500 micron vacuum.
5. Close off valve to vacuum pump and observe the
micron gauge. If gauge pressure rises above 500
microns in one minute, then evacuation is
incomplete or the system has a leak.
6. If vacuum gauge does not rise above 500 microns in
10 minutes, the evacuation should be complete.

N OT I C E
Equipment Damage!
C h a r g e w i t h a c c e s s p o rt o n t h e l i q u i d l i n e s e r v i c e
v a l v e o n l y.
7.

With vacuum pump and micron gauge blanked off,
open valve on R–22 cylinder and allow refrigerant
pressure to build up to about 80 psig.

8. Close valve on the R–22 supply cylinder. Close
valves on manifold gauge set and remove
refrigerant charging hoses from liquid and gas
SS-SVX12C-EN

17

Installation

Refrigerant Charging Procedure

gauge ports.
9. Leak test the entire system. Using proper
procedures and caution, as described in the
previous section, repair any leaks found and repeat
the leak test.

If charging by weight, refer to Table 3, p. 18 for starting
change. If refrigerant adjustments are needed because
of length of line, refer to ”Charging Charts and
Superheat,” p. 26.

Insulating and Isolating
Refrigerant Lines

Charge by weight through the gauge port on the liquid
line. Once the charge enters the system, backseat
(open) the liquid line service valve and disconnect the
charging line and replace the cap on the gauge port.

Insulate the entire suction line with refrigerant piping
insulation. Also insulate any portion of the liquid line
exposed to temperature extremes. Insulate and isolate
liquid and suction lines from each other. Isolate
refrigerant lines from the structure and any duct work.

Notes:
•

R-22 should only be charged in the liquid
state.

•

When possible, always charge the
refrigerant into the liquid line of the unit.

•

If the entire charge can’t be charged into the
liquid line, the balance of the unit charge can
be metered through a charging manifold set
as liquid — preferably through a schrader
valve into the suction line to the compressor
— only while the compressor is running.

•

Check and adjust superheat using Table 6, p.
26, then re-check charging charts to
determine if charge corrections are
necessary.

I m p o rt a n t :
1. To prevent possible noise or vibration
problems, be certain to isolate
refrigerant lines from the building.
2. All suction and hot gas bypass piping (if
installed) should be insulated from the
termination in the air handler to the
condensing unit cabinet entry. Failure to
do so can cause condensate drip off and
performance degradation.
3. Prior to starting a unit, it is advisable to
have the approved oils available in the
event oil needs to be added to the
system.

N OT I C E
Equipment Damage!
N e v e r ch a r g e l i q u i d r e f r i g e r a n t i n t o t h e s u c t i o n
l i n e o f t h e u n i t w i t h t h e c o m p r e s s o r o ff.

N OT I C E
Equipment Damage!
T h i s i s P O E o i l , w h i ch r e a d i l y a b s o r b s m o i s t u r e .
Alwa ys us e ne w oi l a nd n ev e r l e av e c on ta in er s
open to atmosphere while not in use.

Figure 11. Outdoor units - refrigerant piping

Table 2. TTA approved oils
Unit Model Number

Approved Oils

TTA090, TTA120, TTA180,
TTA240

Trane Oil Part Number
OIL00027
(1 quart container)

For units equipped with compressors containing site
glasses, the oil level must be visible through the sight
glass when the compressor is running under stabilized
conditions and a few minutes after the compressor has
stopped.

18

SS-SVX12C-EN

Installation

Table 3. Estimated charge levels at ARI rated line lengths (25 feet)
Refrigerant Charge

Per Circuit

Matched Set

Circuit 1

Circuit 2

Liquid Line
Diameter

Vapor Line
Diameter

TTA090A w/ TWE090A

17.6

N/A

0.625 (5/8")

1.375 (1 3/8")

TTA120A w/ TWE120A

22.5

N/A

0.5 (1/2")

1.375 (1 3/8")

TTA180B w/ TWE180B

19.5

19.5

0.5 (1/2")

1.375 (1 3/8")

TTA240B w/ TWE240B

21.9

21.9

0.5 (1/2")

1.375 (1 3/8")

Liquid Charging
This procedure is accomplished with the unit
operating. Electrical connections must be complete. Do
not proceed until the system is ready to operate.
N o t e : The compressor access panel must be installed
when the unit is running and being charged.
Manifold hoses must be routed through
refrigerant gauge access hole(s). See
”Dimensional Data,” p. 10 for specific locations.

WA R N I N G
Li ve Electrical Components!
Fai l ure t o fol l ow al l e le c tr ic a l s af et y pr ec a uti on s
when exposed to li ve electrical components could
r e s u l t i n d e a t h o r s e r i o u s i n j u r y.
When it is necessary to work with li ve electrical
components, have a qualified licensed electrician
or other indi vidual who has been properly trained
in handling li ve electrical components perform
these tasks.
1. Turn on power to the unit. Allow the system to run
for 15 minutes to stabilize operating conditions.
2. Measure airflow across the indoor coil. Compare
the measurements with the fan performance data in
the Data/Submittal or Service Facts. Once proper
airflow is established, compare discharge pressure
and liquid temperature to the ”Charging Charts,” p.
26. Add or remove refrigerant (liquid only) as
required to obtain correct discharge pressure and
liquid temperature.
3. Check suction line superheat and condenser subcooling to ensure the unit is operating properly.
4. Disconnect all power to the unit.
I m p o rt a n t : If the unit is charged and left without
power until a later date, the crankcase
heater should be energized for a
minimum of 8 hours prior to powering
the compressor(s).

SS-SVX12C-EN

WA R N I N G
H a z a r d o u s Vo l t a g e w / C a p a c i t o r s !
F a i l u r e t o d i s c o n n e c t p o w e r a n d d i s ch a r g e
capacitor s before servicing could result in death or
s e r i o u s i n j u r y.
D i s c o n n e c t a l l e l e c t r i c p o w e r, i n c l u d i n g r e m o t e
d i s c o n n e c t s a n d d i s ch a r g e a l l m o t o r s t a rt / r u n
c a p a c i t o r s b e f o r e s e r v i c i n g . F o l l o w p r o p e r l o ck o u t /
tagout procedures to ensure the power cannot be
i n a d v e rt e n t l y e n e r g i z e d . F o r v a r i a b l e f r e q u e n c y
dri ves or other energy storing components
p r ov i d e d b y Tr a n e o r o t h e r s , r e f e r t o t h e
a p p r o p r i a t e m a n u f a c t u r e r ’s l i t e r a t u r e f o r
a l l o wa b l e w a i t i n g p e r i o d s f o r d i s ch a r g e o f
c a p a c i t o r s . Ve r i f y w i t h a n a p p r o p r i a t e v o l t m e t e r
t h a t a l l c a p a c i t o r s h a v e d i s ch a r g e d .
Fo r a dd it io na l i nfo rm a ti on re gar di ng th e s af e
d i s ch a r g e o f c a p a c i t o r s , s e e P R O D - S V B 0 6 A - E N .
5. Remove the charging system from the unit.
6. Replace all panels.

Electrical Wiring
WA R N I N G
Prope r Fi el d Wi ring a nd Groundi ng
Required!
Fa il u re to f ol lo w c ode c o ul d r es u lt i n de at h or
s e r i o u s i n j u r y.
All field w ir in g MUST be p er for med b y qualif ied
per sonnel. Improperly installed and grounded
field wiring poses FIRE and ELECTROCUTION
h a z a r d s . To a v o i d t h e s e h a z a r d s , y o u M U S T f o l l o w
requirements for field wiring installation and
grounding as described in NEC and your local/
state electrical codes.
Field wiring consists of providing power supply to the
unit, installing the system indoor thermostat and
providing low voltage system interconnecting wiring.
Access to electrical connection locations is shown in
”Dimensional Data,” p. 10. Determine proper wire sizes
and unit protective fusing requirements by referring to
the unit nameplate and/or the unit Service Facts. Field

19

Installation

wiring diagrams for accessories are shipped with the
accessory.

Figure 12.

Electromechanical jobsite connections

Disconnect S witch
(By Others)

Unit Power Supply
The installer must provide line voltage circuit(s) to the
unit main power terminals as shown by the unit wiring
diagrams (available through e-Library or by contacting
a local sales office) or field wiring. Power supply must
include a disconnect switch in a location convenient to
the unit. Ground the unit according to local codes and
provide flexible conduit if codes require and/or if
vibration transmission may cause noise problems.
I m p o rt a n t : All wiring must comply with applicable
local and national (NEC) codes. Type and
location of disconnect switches must
comply with all applicable codes.

B
Electric
Heat Accessory

T’s t a t

C
D
A
A.
B.

WA R N I N G

Air Handler

C.
D.

Fai l ure t o fol l ow c od e c oul d re s ul t in d ea th o r
s e r i o u s i n j u r y.
A l l f i e l d w i r i n g M U ST b e p e r f o r m e d b y q u a l i f i e d
per sonnel. Improperly installed and grounded
field wiring poses FIRE and ELECTROCUTION
h a z a r d s . To a v o i d t h e s e h a z a r d s , y o u M U ST f o l l o w
requirements for field wiring installation and
grounding as described in NEC and your local/
state electrical codes.

ReliaTel™
™ Controls

Use Copper Conductor s Only!
Fai l ure t o us e c op pe r c o ndu ct or s c o ul d r es ul t i n
equipment damage as unit terminals are not
designed to accept other types of conductors.

Disconnect S witch
(By Others) Note 2
Disconnect S witch
(By Others)

3 power wires, line voltage for 3 phase, (2 power wires for
single phase)
3 power wires, line voltage for 3 phase, (2 power wires for
single phase)
Cooling only thermostat: 3 to 7 wires depending on stages of
electric heat
3 to 7 wires depending on type of outdoor unit(s)

Pr o p e r F i e l d W i r i n g a n d G r o u n d i n g
Re q u i r e d!

N OT I C E

B

Wiring shown with dashed lines is to be furnished and
installed by the customer. All customer supplied wiring
must be copper only and must conform to NEC and
local electrical codes. Codes may require line of sight
between disconnect switch and unit.
Notes:
1. When electric heater accessory is used,
single point power entry or dual point power
entry is field optional. Single point power
entry option is through electric heater only.
2. ***Choose only one of the following;
Thermostat, Zone Sensor, or NSB Panel.

Low Voltage Wiring
Mount the indoor thermostat, zone sensor, or Night
Setback Panel (NSB) in accordance with the
corresponding thermostat installation instructions.
Install color-coded, weather-proof, multi-wire cable
according to the field wiring schematics (see ”Field
Wiring”, p. 21).

Electromechanical Controls
Wiring shown with dashed lines is to be furnished and
installed by the customer. All customer supplied wiring
must be copper only and must conform to NEC and
local electrical codes. Codes may require line of sight
between disconnect switch and unit.
N o t e : When electric heater accessory is used, single
point power entry or dual point power entry is
field optional. Single point power entry option is
through electric heater only.

20

SS-SVX12C-EN

Installation

Figure 13.

A.

ReliaTel jobsite connections

D.

3 power wires, line voltage for 3 phase, (2 power wires for
single phase)
3 power wires, line voltage for 3 phase, (2 power wires for
single phase)
Cooling only thermostat: 3 to 7 wires depending on stages of
electric heat
3 to 7 wires depending on type of outdoor unit(s)

E.

Zone Sensor: 4 to 10 wires depending on zone sensor model(a)

F.

Night Setback Panel: 7 wires

B.

Disconnect S witch
(By Others)
Note 2

C.

B

Air Handler

Electric
Heat Accessory

(a)

D

B

A
F

C

E

T’s t a t

Zo n e
Sensor

For SZVAV air handlers: 4 additional wires are required (2 of which
require twisted pair or shielded wire) in order to make connections
between ReliaTel boards in the condenser and air handler.

Disconnect S witch
(By Others) Note 2
Disconnect S witch
(By Others)

NSB P anel

Field Wiring
Figure 14.

Night setback panel field wiring

SS-SVX12C-EN

21

Installation

Figure 15.

Zone sensor field wiring

Figure 16.

Thermostat field wiring

22

SS-SVX12C-EN

Installation

Figure 17. Thermostat wiring for electromechanical units

SS-SVX12C-EN

23

Installation

Refrigerant Circuit
Figure 18. Typical split system cooling refrigerant circuit
COOLING ONLY CIRCUIT DIAGRAM
DISCHARGE
TEMPERATURE
LIMIT (DTL)

GAUGE
CONNECTION

HIGH PRESSURE
SWITCH (HPCO)

NOTE A

D
NOTE A
FIELD SUPPLIED
INTER-CONNECTING
TUBING

S
COMPRESSOR

EQUALIZER
TUBE

AIR

OUTDOOR COIL

EXPANSION
VALVE BULB

GAUGE
CONNECTION

SERVICE
VALVE

NOTE A
AIR

V
TXV

INDOOR COIL

LOW PRESSURE
SWITCH (LPCO)
SERVICE
VALVE

V

SUB-COOLING CIRCUIT

INDICATES DIRECTION OF
REFRIGERANT FLOW

FILTER DRIER

NOTE A

NOTE A: ONLY ONE OUTDOOR AND INDOOR
COIL REFRIGERANT ENTRY AND
EXIT CIRCUIT IS SHOWN. ALL
MODELS HAVE MULTIPLE ENTRY
AND EXIT CIRCUITS.
NOTE B: DUAL CIRCUIT MODELS HAVE 2
REFRIGERATION CIRCUITS.

24

SS-SVX12C-EN

Electrical Data
Table 4. Electrical characteristics — compressor and condenser fan motors — 60 Hz
Compressor Motor
Tons

Unit Model
Number

7.5

10

15

20

TTA090A3

Condenser Fan Motor

Amps
No.

1

Volts

Phase

RLA

LRA

(Ea.)

(Ea.)

Amps
No.

208-230

3

22.4

164

1

Volts

Phase

FLA

LRA

(Ea.)

(Ea.)
8.1

208-230

1

3.1

TTA090A4

1

460

3

10.9

100

1

460

1

1.6

3.8

TTA120A3

1

208-230

3

30.1

225

1

208-230

1

5.0

14.4

TTA120A4

1

460

3

15.5

114

1

460

1

2.5

5.8

TTA180B3

2

208-230

3

22.4

164

2

208-230

2

5.0

14.4

TTA180B4

2

460

3

10.9

100

2

460

2

2.5

5.8

TTA240B3

2

208-230

3

30.1

225

2

208-230

2

5.0

14.4

TTA240B4

2

460

3

15.5

114

2

460

2

2.5

5.8

Note: Electrical characteristics reflect nameplate values and are calculated in accordance with cULus and ARI
specifications.

Table 5. Unit wiring — condensing units — 60 Hz
Tons

7.5

10

15

20

Unit Model
Number

Unit Operating
Voltage Range

Minimum Circuit
Ampacity

Maximum Fuse or HACR
Circuit Breaker Size

TTA090A3

187-253

31.1

45

TTA090A4

414-506

15.2

25

TTA120A3

187-253

42.6

60

TTA120A4

414-506

21.9

30

TTA180B3

187-253

60.4

80

TTA180B4

414-506

29.5

40

TTA240B3

187-253

77.7

100

TTA240B4

414-506

39.9

50

Note: HACR type circuit breaker per NEC.

SS-SVX12C-EN

25

Charging Charts and Superheat
Figure 19. TTA090A charging curve

Figure 21. TTA180B charging curve

TTA090A Ch a rg in g Cu rve
425

425

400

400

375

375

350

350

Re m o ve
c h a rg e

325

Dis c h a rg e P re s s u re , p s ig

Dis c h a rg e P re s s u re , p s ig

TTA180B Ch a rg ing Cu rve

300
275
250
225

Ad d c h a rg e

Re m o ve
c h a rg e

325
300
275
250
225

200

200

175

175

150

150

Ad d c h a rg e

125

125
55

60

65

70

75

80

85

90

95

100

105

110

115

120

125

130

135

140

55

60

65

70

75

80

Figure 20.

TTA120A charging curve

Figure 22.

90

95

100

105

110

115

120

125

130

135

140

125

130

135

140

TTA240B charging curve

TTA120A Ch a rg in g Cu rve

TTA240B Ch a rg ing Cu rve

425

425

400

400
375

375
350

350

Re m o ve
c h a rg e

325

Dis c h a rg e P re s s u re , p s ig

Dis c h a rg e P re s s u re , p s ig

85

Liq u id Te mp e ra tu re Le a vin g OD Co il, °F

Liq u id Te m p e ra tu re Le a vin g OD Co il, °F

300
275
250
225

Ad d c h a rg e

Re m o ve
c h a rg e

325
300
275
250
225

200

200

175

175

150

150

Ad d c h a rg e

125

125
55

60

65

70

75

80

85

90

95

100

105

110

115

120

125

130

135

140

55

60

65

70

75

80

85

90

95

100

105

110

115

120

Liq u id Te mp e ra tu re Le a vin g OD Co il, °F

Liq u id Te m p e ra tu re Le a vin g OD Co il, °F

Table 6. TTA superheat with matched TWE air handler
Cooling Superheat
Condenser

Air Handler

Circuit 1

Circuit 2

TTA090A

TWE090A

12.8

—

TTA120A

TWE120A

15.5

—

TTA180B

TWE180B

18.4

18.4

TTA240B

TWE240B

15.2

15.2

Notes:
1. An adjustable TXV is provided for each circuit in the TWE and TWA models. If the application causes the superheat to deviate from the values shown
above by more than 1 degree - after the system has achieved steady state - the TXV should be adjusted to provide the values shown as measured at
the compressor.
2. The values given above have been tested and are approved for the matched sets shown. If an alternate combination is used, an expansion device
should be used that provides 16-20°F degrees of superheat measured at the compressor.
3. Check and adjust superheat using this table, then compare with charging chart to determine if charge corrections are necessary.

26

SS-SVX12C-EN

Installation Checklist
Complete this checklist once the unit is installed to
verify that all recommended procedures have been
accomplished before starting the system. Do not
operate the system until all items covered by this
checklist are complete.
Inspect unit location for proper required service
clearances.
Inspect unit location for proper free air clearances.
Inspect unit location for secure, level mounting
position.

Refrigerant Piping
Properly sized/constructed liquid and suction lines
connected to stubs at both the indoor and outdoor
units?

Insulated portions of liquid line exposed to
extremes in temperature?
Performed initial leak test?
Evacuated each refrigerant circuit to 500 microns?
Charged each circuit with proper amount of R-22?

Electrical Wiring
Provided unit power wiring (with disconnect) to
proper terminals in the unit control section?
Installed system indoor thermostat?
Installed system low voltage interconnecting wiring
to proper terminals of outdoor unit, indoor unit and
system thermostat?

Insulated the entire suction line?

SS-SVX12C-EN

27

Pre-Start
Control Circuit Features
N o t e : Not all of these features may be required for your
unit, check electrical schematic.

Discharge Temperature Limit (DTL)
The control’s sensor is located on the discharge line.
This device will shut off the compressor and the
outdoor fan(s) if the discharge temperature exceeds the
DTL setting. Once the discharge temperature has
returned to normal, the compressor will cycle back on.

Low Outdoor Ambient Cooling
The Evaporator Defrost Control is standard equipment
on Air Handlers and will permit low ambient cooling
down to 50°F. For cooling operation down to 0°F, use an
Accessory Head Pressure Control on the outdoor unit.

Evaporator Defrost Control (EDC)
This control is located in the Air Handler. The control’s
sensing tube is embedded vertically in the evaporator
coil, near the center. This device will stop the
compressor if the indoor coil temperature drops below
its setting. The indoor air will still circulate across the
coil bringing the temperature of the coil back up to the
cut-in temperature of the evaporator defrost control.

Low Pressure Cut-Out (LPCO)
This control’s sensor is located in the suction (gas) line,
near the compressor. This control will stop the
compressor and the outdoor fans if suction pressure

28

drops below the Low Pressure Cut-Out setting. Once
the suction pressure has returned to normal, the
compressor and outdoor fans will cycle back on.

High Pressure Cut-Out (HPCO)
This control’s sensor is located in the discharge line.
This device will shut off the compressor and the
outdoor fan(s) if the discharge pressure exceeds the
High Pressure Cut-Out’s setting. Once the discharge
pressure has returned to normal, the compressor will
cycle back on.

WA R N I N G
Prevent I nj ury!
D u e t o a g e n c y s a f e t y r e q u i r e m e n t s , n o s ch r a d e r
c o r e i s t o b e i n s t a l l e d b e n e a t h t h e H P C O. R e m o v a l
o f t h e H P C O w i t h o u t e v a c u a t i n g t h e s y s t e m ch a r g e
could cause injury and release of refrigerant.

Internal Overload Protector (IOL)
This device is embedded in the compressor. It will shut
off the compressor if the discharge temperature of the
compressor exceeds its design trip temperature.
N o t e : The IOL will put the compressor back in
operation once the compressor motor heat has
dropped below the trip setting; however, a check
of the refrigerant and electrical systems should
be made to determine the cause and be
corrected.

SS-SVX12C-EN

Start-Up
Electromechanical Controls
The 24–volt, electromechanical controls feature a
control transformer and contactor pressure lugs for
power wiring. Once the unit is properly installed and
pre-start procedures are complete, start the unit by
turning the System Switch on the indoor thermostat to
either H E AT, C O O L or A U TO. The system should
operate normally.

N OT I C E
Equipment Damage!
Ensure the disconnect for the indoor air handler is
closed before operating the system. Operating the
o u t d o o r u n i t w i t h o u t t h e i n d o o r f a n e n e r g i ze d ca n
cause unit trip-out on high pressure control and/or
l i q u i d f l o o d b a ck t o t h e c o m p r e s s o r.

General
Operation of the system cooling (and optional heating)
cycles is controlled by the position of the system switch
on the room thermostat. Once the system switch is
placed in either the H E AT or C O O L position, unit
operation is automatic. The optional automatic
changeover thermostat, when in the A U TO position,
automatically changes to heat or cool with sufficient
room temperature change.

Evaporator Fan (Indoor Supply Air)
The evaporator fan is controlled by an O N / A U TO
switch on the room thermostat. With the switch
positioned at A U TO and the system operating in the
cooling mode, fan operation coincides with the cooling
run cycles. If the system is equipped with heat and is
operating in the heating mode while the fan switch is at
A U TO, fan operation coincides with the heating run
cycles. When the fan switch is positioned at O N , fan
operation is continuous.

Cooling Mode
With the disconnect switch in the O N position, current
is supplied to the compressor sump heater(s), phase
monitor and control transformer. The sump heater(s)
supplies heat to the compressor(s) during the “O ff”
cycle. The phase monitor looks at the incoming power
to verify that there is no reversed phase, no phase
imbalance, and no loss of phase. If the phase monitor
detects any of these three conditions, it will shut off
control voltage. The transformer steps down the line
voltage to 24V for the low voltage control circuit. When
the room thermostat system switch is positioned at
C O O L and the fan switch is at A U TO, the compressor
contactor energizes on a call for cooling. When the
contacts of the compressor contactor close, operation
of the compressor and condenser fan begins. The
SS-SVX12C-EN

evaporator fan contactor also energizes on a call for
cooling and initiates evaporator fan operation.
On units with dual circuits, the second stage of cooling
is initiated as a result of the 2-stage thermostat calling
for additional cooling.

ReliaTel™ Controls
The ReliaTel™ Control is a microelectronic control
feature, which provides operating functions that are
significantly different than conventional
Electromechanical units. The ReliaTel™ Refrigeration
Module (RTRM) uses Proportional/Integral control
algorithms to perform specific unit functions that
govern the unit operation in response to application
conditions.
The RTRM provides compressor anti-short cycle timing
functions through minimum “O ff” and “O n ” timing to
increase reliability, performance and to maximize unit
efficiency. Upon power initialization, the RTRM
performs self-diagnostic checks to ensure that all
internal controls are functioning. It checks the
configuration parameters against the components
connected to the system. The system LED located on
the RTRM module is turned “O n” within one second
after power-up if all internal operations are okay.
Once the unit is properly installed and pre-start
procedures are complete, start the unit by turning the
System Switch on the indoor thermostat to either
H E AT, C O O L or A U TO. The system should operate
normally.

N OT I C E
Equipment Damage!
Ensure the disconnect for the indoor air handler is
closed before operating the system. Operating the
outdoor unit without the indoor fan energized can
cause unit trip-out on high pressure control and/or
l i q u i d f l o o d b a ck t o t h e c o m p r e s s o r.

Control Cooling Mode
For Zone Sensor Control
When the system switch is set to the C O O L position
and the zone temperature rises above the cooling
setpoint, the RTRM energizes the compressor
contactor, provided the high and low pressure and the
discharge temperature limit controls are closed. When
the compressor contacts close, the compressor and the
outdoor fan motor start to maintain the zone
temperature to within ± 2°F of the sensor setpoint at
the sensed location. On units with dual circuits, the
second stage of cooling is initiated as a result of the
Proportional/Integral control algorithms calling for
additional cooling.
29

S t a rt - U p

For Thermostat Control
When the room thermostat system switch is positioned
at C O O L and the fan switch is at A U TO, the RTRM
energizes the compressor contactor, provided the high
and low pressure and the discharge temperature limit
controls are closed. When the contacts of the
compressor contactor close, operation of the
compressor and condenser fan begins. The evaporator
fan contactor also energizes on a call for cooling and
initiates evaporator fan operation. On units with dual
circuits, the second stage of cooling is initiated as a
result of the 2-stage thermostat calling for additional
cooling.
N o t e : Irregular unit operation may occur when the unit
is controlled with a triac-switching thermostat.
Please review the approved thermostat vendor
list for all recommended relay-switching
thermostats.

Control Evaporator Fan Operation
When the fan selection switch is set to the A U TO
position, the RTRM energizes the evaporator fan relay
coil approximately 1 second after energizing the
compressor contactor coil in the cooling mode. In the
heating mode, the RTRM energizes the evaporator fan
relay coil approximately 1 second before energizing the
electric heat contactors.
The RTRM de-energizes the evaporator fan relay coil
approximately 60 seconds on dual compressor units
and 80 seconds on single compressor units after the

30

cooling requirement has been satisfied to enhance unit
efficiency. When the heating cycle is terminated, the
evaporator fan relay coil is de-energized at the same
time as the heater contactors. When the fan selection
switch is set to the O N position, the RTRM keeps the
evaporator fan relay coil energized for continuous fan
motor operation.

Control Heating Operation
Electric heat is factory disabled on all split system units
with ReliaTel control (jumper placed between J2-1 and
J2-2 RTRM inputs). To configure the unit for electric
heat, cut or remove the jumper wire between J2-1 and
J2-2 on the RTRM. All split system units with ReliaTel
control are also configured from the factory for only 1stage of electric heat (jumper placed between J1-3 and
J1-6 RTRM inputs). To configure the unit for 2-stages of
electric heat, cut or remove the jumper placed between
J1-3 and J1-6 RTRM inputs.
When the system switch is set to the H E AT position
and heating is required, the RTRM energizes the Heat 1
relay coil on the RTRM. When the Heat 1 relay contacts
close, the first stage electric heat contactor is
energized. If the first stage of electric heat cannot
satisfy the heating requirement, the RTRM energizes
the Heat 2 relay coil on the RTRM. When the Heat 2
relay contacts close, the second stage electric heat
contactor is energized. The first and second stages of
heat are cycled “O n” and “O ff” as required to maintain
the zone.

SS-SVX12C-EN

Service Test Modes for ReliaTel™
™ Controls
Test Modes

Step Test Mode

Upon power initialization, the RTRM performs selfdiagnostic checks to ensure that all internal controls are
functional. It also checks the configuration parameters
against the components connected to the system. The
system LED located on the RTRM module is turned
“O n ” within one second of power-up if internal
operation is okay.

This method initiates the different components of the
unit, one at a time, by temporarily shorting across the
two test terminals for 2 to 3 seconds.

Use one of the following “ Te s t ” procedures to bypass
some time delays and to start the unit at the control
panel. Each step of unit operation can be activated
individually by temporarily shorting across the “ Te s t ”
terminals for 2 to 3 seconds. The system LED located
on the RTRM module will blink when the test mode has
been initiated. The unit can be left in any “ Te s t ” step
for up to one hour before it will automatically
terminate, or it can be terminated by opening the main
power disconnect switch. Once the test mode has been
terminated, the system LED will glow continuously and
the unit will revert to the “ S y s t e m ” control.

For the initial start-up of the unit, this method allows
the technician to cycle a component “O n” and have up
to one hour to complete the check. Service Test Mode
will be ignored if a short is present across Test 1 and
Test 2 at start-up.

Resistance Test Mode
This method can be used for start-up when a decade
box for variable resistance outputs is available. This
method initiates the different components of the unit,
one at a time, when a specific resistance value is placed
across the two test terminals. The unit will remain in
the specific test mode for approximately one hour even
though the resistance is left on the test terminals.

There are three methods in which the “ Se r v i c e Te s t ”
can be cycled at LTB-Test 1(T1) and LTB-Test 2 (T2).
Table 7. Service test guide for component operation

(a)
(b)

TEST STEP

MODE

FAN

COMP 1

COMP 2

HEAT 1

HEAT 2

OHMS

1

Fan

On

Off

Off

Off

Off

2.2K

2

Cool 1

On

On(a)

Off

Off

Off

4.7K

3(b)

Cool 2

On

On(a)

On(a)

Off

Off

6.8K

4(b)

Heat 1

On

Off

Off

On

Off

10K

5(b)

Heat 2

On

Off

Off

On

On

15K

The condenser fans will operate any time a compressor is ON.
Steps for optional accessories and non-applicable modes in unit will be skipped.

Auto Test Mode
This method is not recommended for start-up due to
the short timing between individual component steps.
This method initiates the different components of the
unit, one at a time, when a fixed jumper is installed
across the test terminals.

SS-SVX12C-EN

The unit will start the first test step and change to the
next step every 30 seconds. At the end of the test
mode, control of the unit will automatically revert to the
applied “ Sy s t e m ” control method. For unit test steps,
test modes, and step resistance values to cycle the
various components, refer to Table 7, p. 31.

31

Troubleshooting
Troubleshooting ReliaTel™
Controls
WA R N I N G
Li ve Electrical Components!
Fai l ure t o fol l ow al l e le c tr ic a l s af et y pr ec a uti on s
when exposed to li ve electrical components could
r e s u l t i n d e a t h o r s e r i o u s i n j u r y.
When it is necessary to work with li ve electrical
components, have a qualified licensed electrician
or other indi vidual who has been properly trained
in handling li ve electrical components perform
these tasks.

outputs, and all of the external controls (relays,
contactors, etc.) that the RTRM outputs energize, for
each respective mode. Proceed to Step 6.
6. Step the system through all of the available modes,
and verify operation of all outputs, controls, and
modes. If a problem in operation is noted in any
mode, you may leave the system in that mode for
up to one hour while troubleshooting. Refer to the
sequence of operations for each mode, to assist in
verifying proper operation. Make the necessary
repairs and proceed to Step 7 and Step 8.
7.

If no abnormal operating conditions appear in the
test mode, exit the test mode by turning the power
“O ff” at the main power disconnect switch.

The RTRM has the ability to provide the service
personnel with some unit diagnostics and system
status information.

8. Refer to the individual component test procedures if
other microelectronic components are suspect.

Before turning the main power disconnect switch “O ff,”
follow the steps below to check the ReliaTel™
Refrigeration Module (RTRM). All diagnostics & system
status information stored in the RTRM will be lost when
the main power is turned “O ff”.

System Status Checkout
Procedure

To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
N o t e : The J6 & J7 screw terminals must be tightened
in order to accurately measure voltage in the
required steps.
1. Verify that the system LED on the RTRM is burning
continuously. If the LED is lit, go to Step 3.
2. If the LED is not lit, verify that 24 VAC is present
between J1-1 and J1-2. If 24 VAC is present,
proceed to Step 3. If 24 VAC is not present, check
the unit main power supply, check transformer
(TNS1). Proceed to Step 3 if necessary.
3. Utilizing ”Method 1”, p. 32 or ”Method 2”, p. 33 in
the System Status Checkout Procedure section,
check the following:
•
•
•

Method 1
If the Zone Sensor Module (ZSM) is equipped with a
remote panel with LED status indication, you can check
the unit within the space. If the ZSM does not have
LED’s, use ”Method 2”, p. 33. BAYSENS010B,
BAYSENS011B, BAYSENS119A, BAYSENS020A,
BAYSENS021A, BAYSENS023A, BAYSENS109 and
BAYSENS110 all have the remote panel indication
feature. The LED descriptions are listed below.
•

•

System status
Heating status
Cooling status

N o t e : If a System failure is indicated, proceed to
Step 4. If no failures are indicated, proceed to
Step 5.
4. If a System failure is indicated, recheck Step 1 and
Step 2. If the LED is not lit in Step 1, and 24 VAC is
present in Step 2, then the RTRM has failed.
Replace the RTRM.
5. If no failures are indicated, use one of the TEST
mode procedures described in the ”Service Test
Modes chapter,” p. 31 to start the unit. This
procedure will allow you to check all of the RTRM
32

“ Sy s t e m S t a t u s ” is checked by using one of the
following two methods:

•

L E D 1 ( Sy s t e m )
–

“O n ” during normal operation.

–

“O ff” if a system failure occurs or the LED fails.

–

“ F l a s h i n g ” indicates test mode

LED 2 (Heat)
–

“O n ” when the heat cycle is operating.

–

“O ff” when the heat cycle terminates or the LED
fails.

–

“ F l a s h i n g ” indicates a heating failure.

LED 3 (Cool)
–

“O n ” when the cooling cycle is operating.

–

“O ff” when the cooling cycle terminates or the
LED fails.

–

“ F l a s h i n g ” indicates a cooling failure.

The following information describes the complete
listing of failure indication causes.

SS-SVX12C-EN

Tr o u b l e s h o o t i n g

System Failure

•

H e a t O p e r a t i n g = approximately 32 VDC

Check the voltage between terminals 6 and 9 on J6, it
should read approximately 32 VDC. If no voltage is
present, a System failure has occurred. Refer to Step 4
in the previous section for the recommended
troubleshooting procedure.

•

H e a t O ff = less than 1 VDC, approximately 0.75 VDC

•

H e a t i n g F a i l u r e = voltage alternates between 32
VDC & 0.75 VDC

Cooling Failure

Measure the voltage between terminals J6-8 & J6-6.

1. Cooling and heating set point (slide pot) on the
zone sensor has failed. Refer to the ”Programmable
& Digital Zone Sensor Test”, p. 35.

•

C o o l O p e r a t i n g = approximately 32 VDC

•

C o o l O ff = less than 1 VDC, approximately 0.75 VDC

•

C o o l i n g F a i l u r e = voltage alternates between 32
VDC & 0.75 VDC

2. Zone temperature thermistor ZTEMP on ZTS failed.
Refer to the ”Programmable & Digital Zone Sensor
Test”, p. 35.
3. CC1 or CC2 24 VAC control circuit has opened,
check CC1 & CC2 coils, and any of the controls
below that apply to the unit (HPC1, HPC2, DTL1,
DTL2).
4. LPC1 has opened during the 3 minute minimum “on
time” during 4 consecutive compressor starts,
check LPC1 or LPC2 by testing voltage between the
J1-8 & J3-2 terminals on the RTRM and ground. If
24 VAC is present, the LPCs have not tripped. If no
voltage is present, LPCs have tripped.

Simultaneous Heat and Cool Failure

WA R N I N G
Li ve Electrical Components!
Fai l ure t o fol l ow al l e le c tr ic a l s af et y pr ec a uti on s
when exposed to li ve electrical components could
r e s u l t i n d e a t h o r s e r i o u s i n j u r y.
When it is necessary to work with li ve electrical
components, have a qualified licensed electrician
or other indi vidual who has been properly trained
in handling li ve electrical components perform
these tasks.
•

Emergency Stop is activated.

Method 2
The second method for determining system status is
done by checking voltage readings at the RTRM (J6).
The system indication descriptions and the
approximate voltages are listed below.

System Failure
Measure the voltage between terminals J6-9 & J6-6.
•

N o r m a l O p e r a t i o n = approximately 32 VDC

•

S y s t e m F a i l u r e = less than 1 VDC, approximately
0.75 VDC

•

Te s t M o d e = voltage alternates between 32 VDC &
0.75 VDC

Heat Failure
Measure the voltage between terminals J6-7 & J6-6.

SS-SVX12C-EN

Cool Failure

To use LED’s for quick status information at the unit,
purchase a BAYSENS010B ZSM and connect wires with
alligator clamps to terminals 6 through 10. Connected
each respective terminal wire (6 through 10) from the
Zone Sensor to the unit J6 terminals 6 through 10.
N o t e : If the system is equipped with a programmable
zone sensor, (BAYSENS119A, or BAYSENS023A),
the LED indicators will not function while the
BAYSENS010A is connected.

Resetting Cooling and Heating
Lockouts
Cooling Failures and Heating Lockouts are reset in an
identical manner.”Method 1”, p. 33 explains resetting
the system from the space; ”Method 2”, p. 33 explains
resetting the system at the unit.
N o t e : Before resetting Cooling Failures and Heating
Lockouts check the Failure Status Diagnostics by
the methods previously explained. Diagnostics
will be lost when the power to the unit is
disconnected.

Method 1
To reset the system from the space, turn the M O D E
selection switch at the zone sensor to the O F F position.
After approximately 30 seconds, turn the M O D E
selection switch to the desired mode, i.e. H E AT, C O O L ,
or A U TO.

Method 2
To reset the system at the unit, cycle the unit power by
turning the disconnect switch O F F and then O N
Lockouts can be cleared through the building
management system. Refer to the building
management system instructions for more
information.

Zone Temperature Sensor (ZTS)
Service Indicator
The ZSM SERVICE LED is a generic indicator that will
signal the closing of a Normally Open switch at any
time, providing the Indoor Motor (IDM) is operating.
33

Tr o u b l e s h o o t i n g

This indicator is usually used to indicate an airside fan
failure.
The RTRM will ignore the closing of this Normally
Open switch for 2 (±1) minutes. This helps prevent
nuisance SERVICE LED indications.

Temperature Tests
N o t e : These procedures are not for programmable or
digital models and are conducted with the Zone
Sensor Module electrically removed from the
system.

Test 1 - Zone Temperature Thermistor
(ZTEMP)
This component can be tested by measuring the
resistance between terminals 1 and 2 on the Zone
Temperature Sensor. See Table 8, p. 34 for typical
indoor temperatures, and corresponding resistive
values.

Table 8. Typical indoor temperatures and values
(continued)
Zone Temperature

Nominal Resistance

65°F or 18.3°C

13.49 Kohms

70°F or 21.1°C

11.9 Kohms

75°F or 23.9°C

10.50 Kohms

80°F or 26.7°C

9.3 Kohms

85°F or 29.4°C

8.25 Kohms

90°F or 32.2°C

7.3 Kohms

Test 2 - Cooling Set Point (CSP) and
Heating Set Point (HSP)
C o o l S P = Terminals 2 and 3
Range = 100 to 900 Ohms approximate
H e a t S P = Terminals 2 and 5
Range = 100 to 900 Ohms approximate

Table 8. Typical indoor temperatures and values
Zone Temperature

Nominal Resistance

50°F or 10.0°C

19.9 Kohms

55°F or 12.8°C

17.47 Kohms

60°F or 15.6°C

15.3 Kohms

Test 3 - System Mode and Fan Selection
The combined resistance of the M O D E selection switch
and the FA N selection switch can be measured
between terminals 2 and 4 on the Zone Sensor. The
possible switch combinations are listed in Table 9, p. 34
with their corresponding resistance values.

Table 9. Test 3 - system mode and fan selection

34

Resistance Valves(Ohms)

Zone Sensor Unit/Fan
Mode

Local Unit Mode

Local Fan Mode

2.32K

Off/Auto

Off

Auto

4.87K

Cool/Auto

Cool

Auto

7.68K

Auto/Auto

Auto

Auto

10.77K

Off/On

Off

On

13.32K

Cool/On

Cool

On

16.13K

Auto/On

Auto

On

19.48K

Heat/Auto

Heat

Auto

27.93K

Heat/On

Heat

On

35.0K

Emergency Heat/Auto

Emergency Heat

Auto

43.45K

Emergency Heat/On

Emergency Heat

On

Out of Range (Short)

INVALID/Short

Invalid (CV), Auto (VAV)

Invalid

Out of Range (Open)

INVALID/Open

Invalid (CV), Off (VAV)

Invalid

SS-SVX12C-EN

Tr o u b l e s h o o t i n g

Test 4 - LED Indicator Test (SYS ON,
HEAT, & COOL)

WA R N I N G
Li ve Electrical Components!
Fai l ure t o fol l ow al l e le c tr ic a l s af et y pr ec a uti on s
when exposed to li ve electrical components could
r e s u l t i n d e a t h o r s e r i o u s i n j u r y.
When it is necessary to work with li ve electrical
components, have a qualified licensed electrician
or other indi vidual who has been properly trained
in handling li ve electrical components perform
these tasks.

J6-11.

WA R N I N G
Li ve Electrical Components!
Fa il u re to f ol lo w a ll el e ct ri c al s a fe ty p re c au ti ons
when exposed to li ve electrical components could
r e s u l t i n d e a t h o r s e r i o u s i n j u r y.
When it is necessary to work with li ve electrical
components, have a qualified licensed electrician
or other indi vidual who has been properly trained
in handling li ve electrical components perform
these tasks.

Method 1

2. Disconnect wires from J6-11 and J6-12. Measure
the voltage between J6-11 and J6-12, should be
about 32 VDC.

Testing the LED using a meter with diode test function.
Test both forward and reverse bias. Forward bias
should measure a voltage drop of 1.5 to 2.5 volts,
depending on your meter. Reverse bias will show an
Over Load, or open circuit indication if LED is
functional.

3. Reconnect wires to terminals J6-11 and J6-12.
Measure voltage again between J6-11 and J6-12,
voltage should flash high and low every 0.5
seconds. The voltage on the low end will measure
about 19 VDC, while the voltage on the high end
will measure from approximately 24 to 38 VDC.

Method 2

4. Verify all modes of operation, by running the unit
through all of the steps in ”Service Test Modes for
ReliaTel Controls,” p. 31.

Testing the LED with an analog Ohmmeter. Connect
Ohmmeter across LED in one direction, then reverse
the leads for the opposite direction. The LED should
have at least 100 times more resistance in reverse
direction, as compared with the forward direction. If
high resistance in both directions, LED is open. If low in
both directions, LED is shorted.

Method 3
To test LED’s with ZSM connected to unit, test voltages
at LED terminals on ZSM. A measurement of 32 VDC,
across an unlit LED, means the LED has failed.
I m p o rt a n t : Measurements should be made from LED
common (ZSM terminal 6 to respective LED
terminal).

Programmable & Digital Zone
Sensor Test

5. After verifying proper unit operation, exit the test
mode. Turn the fan on continuously at the ZSM, by
pressing the button with the fan symbol. If the fan
comes on and runs continuously, the ZSM is good.
If you are not able to turn the fan on, the ZSM is
defective.

RLCI Loss of Communications
If the RLCI loses input from the building management
system, the RTRM will control in the default mode after
approximately 15 minutes. If the RTRM loses the
Heating and Cooling setpoint input, the RTRM will
control in the default mode instantaneously. The
temperature sensing thermistor in the Zone Sensor
Module is the only component required for the
“ D e f a u l t M o d e” to operate.

Testing Serial Communication Voltage
1. Verify 24 VAC is present between terminals J6-14 &

SS-SVX12C-EN

35

Maintenance
WA R N I N G

Remove any accumulation of dust and/or dirt from
the unit casing.

H a z a r d o u s Vo l t a g e w / C a p a c i t o r s !
F a i l u r e t o d i s c o n n e c t p o w e r a n d d i s ch a r g e
capacitor s before servicing could result in death or
s e r i o u s i n j u r y.
D i s c o n n e c t a l l e l e c t r i c p o w e r, i n c l u d i n g r e m o t e
d i s c o n n e c t s a n d d i s ch a r g e a l l m o t o r s t a rt / r u n
c a p a c i t o r s b e f o r e s e r v i c i n g . F o l l o w p r o p e r l o ck o u t /
tagout procedures to ensure the power cannot be
i n a d v e rt e n t l y e n e r g i z e d . F o r v a r i a b l e f r e q u e n c y
dri ves or other energy storing components
p r o v i d e d b y Tr a n e o r o t h e r s , r e f e r t o t h e
a p p r o p r i a t e m a n u f a c t u r e r ’s l i t e r a t u r e f o r
a l l o w a b l e w a i t i n g p e r i o d s f o r d i s ch a r g e o f
c a p a c i t o r s . Ve r i f y w i t h a n a p p r o p r i a t e v o l t m e t e r
t h a t a l l c a p a c i t o r s h a v e d i s ch a r g e d .
For ad di ti on al i n for m at io n rega rdi ng t he s a fe
d i s ch a r g e o f c a p a c i t o r s , s e e P R O D - S V B 0 6 A - E N .

N OT I C E
O p e r a t i n g U n d e r Va c u u m !
Do not operate or apply power to the compressor
whi l e un de r a va c uu m . Fai l ure to fo ll ow t he s e
instructions will result in compressor failure.
Perform all of the indicated maintenance procedures at
the intervals scheduled. This will prolong the life of the
unit and reduce the possibility of costly equipment
failure.

Monthly
Conduct the following maintenance inspections once
per month.

Inspect the control panel wiring to ensure that all
connections are tight and that the insulation is
intact.
N o t e : Condenser fan motors are permanently
lubricated.
Check refrigerant piping and fittings for leaks
Inspect the condenser coils for dirt and debris. If the
coils appear dirty, clean them.

Coil Cleaning
Regular coil maintenance, including annual cleaningenhances the unit's operating efficiency by minimizing:
•
•
•
•

compressor head pressure and amperage draw
water carryover
fan brake horsepower
static pressure losses

At least once each year — or more often if the unit is
located in a “dirty” environment — clean the coil using
the instructions outlined below. Be sure to follow these
instructions as closely as possible to avoid damaging
the coils. To clean refrigerant coils, use a soft brush and
a sprayer. Contact your local Parts Center for
appropriate detergents.
1. Remove enough panels from the unit to gain safe
access to coil.
2. Straighten any bent coil fins with a fin comb.

Check unit wiring to ensure all connections are tight
and that the wiring insulation is intact.

3. Remove loose dirt and debris from both sides of the
coil with a soft brush.

Inspect the condenser coils for dirt and debris. If the
coils appear dirty, clean them.

4. Mix the detergent with water according to the
manufacturer's instructions. If desired, heat the
solution to 150° F maximum to improve its
cleansing capability.

With the unit operating in the cooling mode, check
the suction and discharge pressures and compare
them with Pressure Curve values in unit Service
Facts. Record these readings on the ”Maintenance
Log”, p. 37.

Annually (Cooling Season)
The following maintenance procedures must be
performed at the beginning of each cooling season to
ensure efficient unit operation.

36

Remove corrosion from any surface and repaint.
Check the gasket around the control panel door to
ensure it fits correctly and is in good condition to
prevent water leakage.

5. Pour the cleaning solution into the sprayer.
6. Spray the leaving-airflow side of the coil first; then
spray the opposite side of the coil. Allow the
cleaning solution to stand on the coil for five
minutes.
7.

Rinse both sides of the coil with cool, clean water.

8. Inspect both sides of the coil; if it still appears to be
dirty, repeat Step 7 and 8.

Perform all of the monthly maintenance
inspections.

9. Reinstall all of the components and panels removed
in Step 1; then restore power to the unit.

With the unit operating, check unit superheat and
record the reading in the ”Maintenance Log”, p. 37.

10. Using a fin comb, straighten any coil fins that were
inadvertently bent during the cleaning process.
SS-SVX12C-EN

SS-SVX12C-EN

Dry
Bulb

Wet
Bulb
(C1)

(C2)

Suction Pressure
(C1)

(C2)

Discharge Pressure

Compressor

Note: Perform each inspection once per month (during cooling season) while unit is operating

Date

Ambient
Temp.
(°F)

Evaporator Entering Air

Circuit #1

Circuit #2

Superheat (°F)
(at compressor)

Circuit #1

Circuit #2

Subcooling (°F)
(at service valve)

Maintenance

Maintenance Log

37

Wiring Diagram Matrix
Table 10. Wiring schematics R-22 cooling
R—22 Unit

Power Diagram

Connection Diagram

TTA090A300GA

231304550100

231304590100

TTA090A400GA

231304550100

231304590100

TTA120A300GA

231304560100

231304600100

TTA120A400GA

231304550100

231304590100

TTA180B300GA

231304040100

231304210100

TTA180B400GA

231304040100

231304210100

TTA240B300GA

231304080100

231304220100

TTA240B400GA

231304040100

231304210100

Note: Wiring diagrams are available through e-Library or by contacting your local sales office.

38

SS-SVX12C-EN

Notes

SS-SVX12C-EN

39

Notes

The manufacturer optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand,
the leader in creating and sustaining safe, comfortable and energy efficient environments, the manufacturer offers a
broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts. For more
information, visit www.IRCO.com.
The manufacturer has a policy of continuous product and product data improvements and reserves the right to change design and specifications without notice.
©2014 Trane

All rights reserved

SS-SVX12C-EN

14 Jan 2014

Supersedes SS-SVX12B-EN

We are committed to using environmentally
(July 2012)

conscious print practices that reduce waste.



---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.6
Linearized                      : No
Arbortext Build                 : R60M070-1022
Author                          : Trane Clarksville
Config File                     : C:\Users\lahhf\Documents\Arbortext\Projects\Eclipse_Workspace\CCMS_DEVELOPMENT\Arbortext_PE_6.0\app\low-res.3sppdf
Create Date                     : 2014:01:16 10:58:18-06:00
Date Published                  : 14 Jan 2014
EPS Processor                   : PStill version 1.78.16
Keywords                        : TTA, R-22, Odyssey, TTA090A***G*, TTA120A***G*, TTA180B***G*, TTA240B***G*..
Lit Order NBR                   : SS-SVX12C
Modify Date                     : 2014:01:16 11:19:14-06:00
Print Engine                    : Arbortext Advanced Print Publisher 11.0.2954/W Library
Page Count                      : 40
Page Layout                     : SinglePage
XMP Toolkit                     : Adobe XMP Core 5.2-c001 63.139439, 2010/09/27-13:37:26
Arbortext 0020 Build            : R60M070-1022
Config 0020 File                : C:\Users\lahhf\Documents\Arbortext\Projects\Eclipse_Workspace\CCMS_DEVELOPMENT\Arbortext_PE_6.0\app\low-res.3sppdf
EPS processor                   : PStill version 1.78.16
Print 0020 Engine               : Arbortext Advanced Print Publisher 11.0.2954/W Library
Creator Tool                    : Arbortext Editor with Styler
Metadata Date                   : 2014:01:16 11:19:14-06:00
Producer                        : PDFlib+PDI 8.0.2p1 (C++/Win32)
Format                          : application/pdf
Title                           : Split System Air Conditioners Odyssey
Creator                         : Trane Clarksville
Description                     : R-22 Dry Charge, Cooling Condenser — 7.5, 10, 15 and 20 Tons Installation, Operation and Maintenance
Rights                          : ©2014 Trane All rights reserved.
Subject                         : TTA, R-22, Odyssey, TTA090A***G*, TTA120A***G*, TTA180B***G*, TTA240B***G*
Document ID                     : uuid:d29b4680-8e3e-446a-b5df-7da59898abd9
Instance ID                     : uuid:4951c001-17ca-4218-a0c8-ee9463315a23
Marked                          : True
Web Statement                   : www.trane.com
Startup Profile                 : Print
Warning                         : [Minor] Ignored duplicate Info dictionary

EXIF Metadata provided by EXIF.tools