Trane 2TTB3 User Manual

2TTB-SVN01A-EN

18-AC56D1-1

Installer’s Guide

Condensing Units

2TTB3

ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES

IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information

pack upon completion of work.

These instructions do not cover all variations in
systems nor provide for every possible contingency to
be met in connection with installation. All phases of
this installation must comply with NATIONAL, STATE
AND LOCAL CODES. Should further information be

desired or should particular problems arise which are not
covered sufficiently for the purchaser’s purposes, the matter
should be referred to your installing dealer or local distributor.

1

5 FT. ABOVE UNIT — UNRESTRICTED

A. GENERAL

!

WARNING

This information is intended for use by individuals posses­sing adequate backgrounds of electrical and mechanical
experience. Any attempt to repair a central air conditioning
product may result in personal injury and or property
damage. The manufacturer or seller cannot be responsible
for the interpretation of this information, nor can it assume
any liability in connection with its use.

NOTICE:
Trane has always recommended installing Trane approved
matched indoor and outdoor systems.

The benefits of installing approved matched systems are
maximum efficiency, optimum performance and best
overall system reliability.

Check for transportation damage after unit is uncrated.
Report promptly, to the carrier, any damage found to the unit.

To determine the electrical power requirements of the unit,
refer to the nameplate of the unit. The electrical power
available must agree with that listed on the nameplate.

B. LOCATION AND PREPARATION

OF THE UNIT

1. When removing unit from the pallet, notice the tabs on
the basepan. Remove tabs by cutting with a sharp tool as
shown in Figure 2 (see page 2).

2. The unit should be set on a level support pad at least as
large as the unit base pan, such as a concrete slab. If this
is not the application used please refer to application
bulletin “Trane APB2001-02”.

3. The support pad must NOT be in direct contact with any
structure. Unit must be positioned a minimum of 12"
from any wall or surrounding shrubbery to insure
adequate airflow. Clearance must be provided in front of
control box (access panels) & any other side requiring

service access to meet National Electrical Code. Also,
the unit location must be far enough away from any
structure to prevent excess roof run-off water from
pouring directly on the unit. Do not locate unit(s) close
to bedroom(s).

4. The top discharge area must be unrestricted for at least
five (5) feet above the unit.

5. When the outdoor unit is mounted on a roof, be sure the
roof will support the unit’s weight. Properly selected
isolation is recommended to prevent sound or vibration
transmission to the building structure.

6. The maximum length of refrigerant lines from outdoor to
indoor unit should NOT exceed sixty (60) feet.

7. If outdoor unit is mounted above the air handler, maxi­mum lift should not exceed sixty (60) feet (suction line).
If air handler is mounted above condensing unit, maxi­mum lift should not exceed sixty (60) feet (liquid line).

NOTE:
Refer to “Refrigerant Piping Software” Pub. No. 32-3312-0*
(the position of the * denotes the latest revision number).

8. Locate and install indoor coil or air handler in accor­dance with instruction included with that unit.

Installer’s Guide

2

BASEPAN TAB REMOVAL

C. INSTALLING REFRIGERANT LINES

!

CAUTION

If using existing refrigerant lines make certain that all joints
are brazed, not soldered.

Condensing units have provisions for braze connections.
Pressure taps are provided on the service valves of outdoor

unit for compressor suction and liquid pressures.
The indoor end of the recommended refrigerant line sets may

be straight or with a 90 degree bend, depending upon situa­tion requirements. This should be thoroughly checked out
before ordering refrigerant line sets.

The gas line must always be insulated.

!

CAUTION

In scroll compressor applications, dome temperatures may
be hot. Do not touch top of compressor, may cause minor
to severe burning.

The units are factory charged with the system charge
required when using fifteen (15) feet of rated connecting line.
Unit nameplate charge is the same.

Final refrigerant charge adjustment is necessary. Use
the Subcooling Charging procedure on page 6 or in the
outdoor unit Service Facts.

1. Determine the most practical way to run the lines.

2. Consider types of bends to be made and space limitations.

NOTE:
Large diameter tubing will be very difficult to rebend once it
has been shaped.

3. Determine the best starting point for routing the refriger­ant tubing — INSIDE OR OUTSIDE THE STRUCTURE.

4. Provide a pull-thru hole of sufficient size to allow both
liquid and gas lines.

5. Be sure the tubing is of sufficient length.

6. Uncoil the tubing — do not kink or dent.

7. Route the tubing making all required bends and properly
secure the tubing before making connections.

8. To prevent a noise within the building structure due to
vibration transmission from the refrigerant lines, the
following precautions should be taken:

a. When the refrigerant lines have to be fastened to floor

joists or other framing in a structure, use isolation
type hangers.

b. Isolation hangers should also be used when refriger-

ant lines are run in stud spaces or enclosed ceilings.

c. Where the refrigerant lines run through a wall or sill,

they should be insulated and isolated.

d. Isolate the lines from all ductwork.

D. SERVICE VALVE OPERATION

BRASS LIQUID AND GAS LINE SERVICE VALVES

The Brass Liquid and Gas Line Service Valves are factory
shipped in the seated position to hold factory charge. The
pressure tap service port (when depressed) opens only to the
field brazing side of the valve when the valve is in the seated
position. The liquid line valve is not a back seating valve
(see WARNING below).

!

WARNING

Extreme caution should be exercised when opening the
Liquid Line Service Valve. Turn valve stem counterclock­wise only until the stem contacts the rolled edge. (See
Figure 3) No torque is required.

BRASS GAS LINE BALL SERVICE VALVE

The Brass Gas Line Ball Service Valve is shipped in the
closed position to hold the factory refrigerant charge. The
pressure tap service port (when depressed) opens only to the
field brazing side when the valve is in the closed position.
The Gas Line Ball Service Valve is full open with a 1/4 turn.
See Figure 4.

BRAZING REFRIGERANT LINES

1. Remove lower access cover to access service valves.

2. Before brazing, remove plugs from external copper stub
tubes. Clean internal and external surfaces of stub
tubes prior to brazing.

3. Cut and fit tubing, minimizing the use of sharp
90° bends.

4. Insulate the entire gas line and its fittings.

5. Do NOT allow uninsulated liquid line to come in direct
contact with bare gas line.

6. Precautions should be taken to avoid heat damage
to the pressure tap valve core during brazing. It is
recommended that the pressure tap port valve
core be removed and a wet rag wrapped around
the valve body.

NOTE:
Use care to make sure that no moisture enters pressure tap
port, while wet rag is being used.

NOTE:
Precautions should be taken to avoid heat damage to
basepan during brazing. It is recommended to keep the
flame directly off of the basepan.

7. Use a Dry Nitrogen Purge and Brazing Alloy without
flux when brazing the field line to the copper factory
connection. Flow dry nitrogen into either valve pressure
tap port, thru the tubing and out the other port while
brazing.

8. Braze using accepted good brazing techniques.

LEAK CHECK

IMPORTANT:

Replace pressure tap port valve core before attaching hoses for
evacuation.

© 2005 American Standard Inc. All Rights Reserved 18-AC56D1-1

Installer’s Guide

3

LIQUID LINE SERVICE VALVE

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 through
the service valve ports, the indoor unit and field refrigerant
lines with dry nitrogen to 350-400 psi. Use soap bubbles or
other leak-checking methods to see that all field joints are
leak-free! If not, release pressure; then repair!

SYSTEM EVACUATION

NOTE:
Since the outdoor unit has a refrigerant charge, the gas and
liquid line valves must remain closed.

1. Upon completion of leak check, evacuate the refrigerant
lines and indoor coil before opening the gas and liquid
line valves.

2. Attach appropriate hoses from manifold gauge to gas
and liquid line pressure taps.

NOTE:
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 HCFC-22 and
vacuum pump.

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

4. Evacuate until the micron gauge reads no higher than
350 microns.

5. Close off valve to vacuum pump and observe the micron
gauge. If gauge pressure rises above 500 microns in one (1)
minute, then evacuation is incomplete or system has a leak.

6. If vacuum gauge does not rise above 500 microns in
one (1) minute, the evacuation should be complete.

7. With vacuum pump and micron gauge blanked off,
open valve on HCFC-22 cylinder and charge refriger­ant lines and indoor coil with vapor to tank pressure
of HCFC-22 supply.

8. Close valve on HCFC-22 supply cylinder. Close valves
on manifold gauge set and remove refrigerant charging
hoses from liquid and gas pressure tap ports.

GAS LINE SERVICE VALVE

9. The liquid line shut-off valve can now be opened. Remove
shut-off valve cap. Fully insert hex wrench into the stem
and backout counterclockwise until valve stem just touches
rolled edge (approximately five [5] turns) observing
WARNING statement on page 2. See Figure 3.

10. Replace liquid service pressure tap port cap and valve

stem cap. These caps MUST BE REPLACED to
prevent leaks. Replace valve stem cap and pressure tap
cap finger tight, then tighten an additional 1/6 turn.

11. The gas valve can now be opened. Open the gas valve by
removing the shut-off valve cap and turning the valve
stem 1/4 turn counterclockwise, using 1/4" Open End or
Adjustable wrench. See Figure 4.

12. The gas valve is now open for refrigerant flow. Replace
valve stem cap to prevent leaks. Again, these caps
MUST BE REPLACED to prevent leaks. Replace valve
stem cap and pressure tap cap finger tight, then tighten
an additional 1/6 turn. See Figure 4.

If refrigerant lines are longer than 15 feet and/or a
different size than recommended, it will be necessary to
adjust system refrigerant charge upon completion of
installation. See page 6 or in the unit Service Facts.

4

GAS LINE BALL SERVICE VALVE

UNIT SIDE
OF VALVE

PRESSURE TAP PORT

CAP

GAS LINE CONNECTION

CAP

1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION

VALVE STEM

BODY

NOTE:
A 3/16" Allen wrench is required to open liquid line service

COOLING

valve. A 1/4" Open End or Adjustable wrench is required to
open gas line valve. A 3/4" Open End wrench is required to
take off the valve stem cap.

CORE

18-AC56D1-1 3

Installer’s Guide

E. ELECTRICAL CONNECTIONS

!

WARNING

When installing or servicing this equipment, ALWAYS
exercise basic safety precautions to avoid the possibility of
electric shock.

1. Power wiring and grounding of equipment must comply
with local codes.

2. Power supply must agree with equipment nameplate.

3. Install a separate disconnect switch at the outdoor unit.

4. Ground the outdoor unit per local code requirements.

5. Provide flexible electrical conduit whenever vibration
transmission may create a noise problem within the
structure.

6. The use of color coded low voltage wire is recommended
to simplify connections between the outdoor unit, the
thermostat and the indoor unit.

Table 1 — NEC Class II Control Wiring

24 VOLTS

WIRE SIZE MAX. WIRE LENGTH

18 AWG 150 FT
16 AWG 225 FT.
14 AWG 300 FT.

7. Table 1 defines maximum total length of low voltage
wiring from outdoor unit, to indoor unit, and to thermostat.

8. Mount the indoor thermostat in accordance with instruc­tion included with the thermostat. Wire per appropriate
hook-up diagram (included in these instructions).

F. COMPRESSOR START-UP

After all electrical wiring is complete, SET THE THERMO­STAT SYSTEM SWITCH IN THE OFF POSITION SO
COMPRESSOR WILL NOT RUN, and apply power by
closing the system main disconnect switch. This will activate
the compressor sump heat (where used). Do not change the
Thermostat System Switch until power has been applied for
one (1) hour. Following this procedure will prevent potential
compressor overload trip at the initial start-up.

G. OPERATIONAL AND

CHECKOUT PROCEDURES

Final phases of this installation are the unit Operational and
Checkout Procedures which are found in this instruction (see
table below and pages 6 and 8). To obtain proper perfor­mance, all units must be operated and charge adjustments
made in accordance with procedures found on page 6 and in
the Service Facts.

H. SEACOAST SHIELD

Units installed within one mile of salt water, including
seacoasts and inland waterways, require the addition of
BAYSEAC001 (Seacoast Kit) at the time of installation.

IMPORTANT:

See Limited Warranty information in Use and Care Manual.

I. TROUBLESHOOTING

TROUBLESHOOTING CHART — WHAT TO CHECK

CO

LTAG

E W

IR

IN

STAR

RU

N CAPACITOR

T CAPACITOR

CO

MPR. IO

G

L

P

S

P

P

P

P

P

P

S

P

P
SPP

CO

LO

NTAC

W

TO

START RELAY

R CO

P

P
P

N

VO

LTAGE W

NTACTS

P

PPS

HIGH

VO

POW

SYSTEM FAULTS

REFRIGERANT CIRCUIT

Liquid Pressure Too High
Liquid Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low
Liquid Refrig. Floodback TXV System
I.D. Coil Frosting
Compressor Runs Inadequate or No Cooling

ELECTRICAL

Compressor & O.D. Fan Do Not Start
Compressor Will Not Start But O.D. Fan Runs
O.D. Fan Won’t Start
Compressor Hums But Won’t Start
Compressor Cycles on IOL
I.D. Blower Won’t Start

P - Primary Causes S - Secondary Causes

ER SUPPLY

TR

LOW

O

C

L TRANSFO

ON

TAC

TOR

RM

IR

IN

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SSPPPP

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REFRIG

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LTAGE FUSE

M

PRESSO

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O

IL

R

ESTRICTED

O.D

EXCE

IG

ERANT U

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. AIR REC

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CO

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IVE EVAP. LO

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FLO

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R

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GE

AD

W

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RESTRICTED I.D. AIRFLO

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REF. C

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UIT RESTRICTIO

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EA

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W

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P

SW

ITCH

S
S

S

S
S

S
S

CHECKOUT PROCEDURE WITH MAIN POWER DISCONNECTS CLOSED (ON)

INDOOR THERMOSTAT

SWITCH SETTING

Step

No.

11

Fan Switch

TO CHECK Off Cool Heat Auto On

Indoor Outdoor

Blower Fan

Runs Runs Heater Comes On

1 Sump Heat X X X
2 Indoor Fan Operation X X X X
3 Cooling Operation X X X X X X
4 Checking Performance X X X X X X

& Charge

5 Heating

2

XX X X X

USE CHARTS ATTACHED TO O.D. UNIT

6 Inform owner on how to operate system and what to expect of it. At the same time deliver Owner’s Use and Care Booklet.

1

Also set thermostat dial to call for cooling or heating as necessary.

2

Check only necessary if heating unit is used for indoor section and wiring has been disturbed during installation of cooling equipment.

3

When applicable.

4 18-AC56D1-1

COMPONENT OPERATION

Compressor

3

Runs

Comp. Furnace

Sump Heat

TYPICAL FIELD HOOK-UP DIAGRAMS

PRINTED FROM B152901 P02

Installer’s Guide

NOTE

*

PRINTED FROM B152903 P02

W2 present only on 2 stage

*

thermostat and furnace

Notes:

1. Be sure power supply agrees with equipment nameplate.

2. Power wiring and grounding of equipment must comply with local codes.

3. Low voltage wiring to be No. 18 AWG minimum conductor.

4. ODT-B must be set lower than ODT-A.

5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.

18-AC56D1-1 5

LEGEND

FACTORY WIRING
FIELD WIRING

Installer’s Guide

Installer’s Guide

SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT

The Trane company has always recommended installing
Trane approved

All 13 SEER Trane split systems are ARI rated with only
TXV indoor systems.

The benefits of installing approved indoor and outdoor split
systems are maximum efficiency, optimum performance and
the best overall system reliability.

The following charging methods are therefore prescribed for
systems with indoor TXVs.

1. Subcooling (in the cooling mode) is the
method of charging above 55°F ambient temperatures.

2. For best results - the indoor temperature should be kept
between 70°F to 80°F. Add system heat if needed.

3. At start-up, or whenever charge is removed or added, the
system must be operated for a minimum 20 minutes to
stabilize before accurate measurements can be made.

4. Measure Liquid Line Temperature and Refrigerant
Pressure at service valves.

5. Determine total refrigerant line length, and height (lift)
if indoor section is above the condenser.

6. Determine the Design Subcool Charging Temperature
from the unit nameplate.

7. Locate this value in the appropriate column of the
Subcooling Charging Table. Locate your liquid line
temperature in the left column of the table, and the
intersecting liquid line pressure under your nameplate
subcool value column. Add refrigerant to raise the pres­sure to match the table, or remove refrigerant to lower
the pressure. Again, wait 20 minutes for the system
conditions to stabilize before adjusting charge again.

8. When system is correctly charged, you can refer to
System Pressure Curves (in Service Facts) to verify
typical performance.

matched indoor and outdoor systems.

only recommended

R-22 SUBCOOLING CHARGING TABLE

LIQUID

TEMP.

(°F)

45 89 93 96 100
50 98 102 105 109
55 107 111 115 119
60 117 121 126 130
65 128 132 137 141
70 139 144 148 153
75 151 156 161 166
80 163 168 174 179
85 176 182 187 193
90 190 196 202 208

95 205 211 217 223
100 220 226 233 239
105 236 243 249 256
110 253 260 267 274
115 271 278 285 293
120 289 297 305 313
125 309 317 325 333

DESIGN SUBCOOLING VALUES (°F)

8101214

LIQUID LINE PRESSURE (psi)

SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE

60
50
40
30
25

Add 5 psig to Subcool Charging Table Pressure

20
15

Use Design Subcool Value from Table

10

REFRIGERANT

LINE LIFT (FEET)

Subtract 5 psig from S.C. Table Pressure

0

10 20 25 30 40 60 80

TOTAL REFRIGERANT LINE LENGTH (FEET)

6 18-AC56D1-1

Installer’s Guide

2TTB3 OUTLINE DRAWING

NOTE: ALL DIMENSIONS ARE IN MM (INCHES).

MODELS BASE FIG. A B C D E F G H J K

2TTB3018A 2 2 651 (25-5/8) 724 (28-1/2) 651 (25-5/8) 5/8 1/4 127 (5) 57 (2-1/4) 181 (7-1/8) 44 (1-3/4) 457 (18)

2TTB3024A 2 2 832 (32-3/4) 724 (28-1/2) 651 (25-5/8) 3/4 5/16 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)

2TTB3030A 3 2 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 3/4 5/16 137 (5-3/8) 86 (3-3/8) 210 (8-1/4) 79 (3-1/8) 508 (20)

2TTB3036A 3 2 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 7/8 3/8 137 (5-3/8) 86 (3-3/8) 210 (8-1/4) 79 (3-1/8) 508 (20)

2TTB3042A 4 1 841 (33-1/8) 946 (37-1/4) 870 (34-1/4) 7/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)

2TTB3048A 4 1 1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 1-1/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)

2TTB3060A 4 1 1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 1-1/8 3/8 152 (6) 98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)

From Dwg. 21D153074 Rev. 10

18-AC56D1-1 7

Installer’s Guide

Trane
A business of
American Standard Companies
www.trane.com

Trane has a policy of continuous product and product data improvement and it reserves the right to change

design and specifications without notice.