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.
5 FT. ABOVE UNIT — UNRESTRICTED
1
A. GENERAL
!
WARNING
This information is intended for use by individuals posses-
sing 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.
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).
Check for transportation damage after unit is uncrated.
Report promptly, to the carrier, any damage found to the unit.
4. The top discharge area must be unrestricted for at least
five (5) feet above 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.
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.
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).
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, maxi-
mum lift should not exceed sixty (60) feet (suction line).
If air handler is mounted above condensing unit, maxi-
mum lift should not exceed sixty (60) feet (liquid line).
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”.
NOTE:
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
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 accor-
dance with instruction included with that unit.
Installer’s Guide
LIQUID LINE SERVICE VALVE
GAS LINE SERVICE VALVE
3
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!
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.
SYSTEM EVACUATION
NOTE:
Since the outdoor unit has a refrigerant charge, the gas and
liquid line valves must remain closed.
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.
1. Upon completion of leak check, evacuate the refrigerant
lines and indoor coil before opening the gas and liquid
line valves.
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.
2. Attach appropriate hoses from manifold gauge to gas
and liquid line pressure taps.
NOTE:
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.
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.
GAS LINE BALL SERVICE VALVE
4
3. Attach center hose of manifold gauges to vacuum pump.
CAP
1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
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.
VALVE STEM
UNIT SIDE
OF VALVE
6. If vacuum gauge does not rise above 500 microns in
one (1) minute, the evacuation should be complete.
PRESSURE TAP PORT
GAS LINE CONNECTION
7. With vacuum pump and micron gauge blanked off,
open valve on HCFC-22 cylinder and charge refriger-
ant 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.
CAP
BODY
NOTE:
A 3/16" Allen wrench is required to open liquid line service
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.
COOLING
CORE
18-AC56D1-1
3
Installer’s Guide
E. ELECTRICAL CONNECTIONS
G. OPERATIONAL AND
CHECKOUT PROCEDURES
!
WARNING
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 perfor-
mance, all units must be operated and charge adjustments
made in accordance with procedures found on page 6 and in
the Service Facts.
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.
H. SEACOAST SHIELD
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.
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.
5. Provide flexible electrical conduit whenever vibration
transmission may create a noise problem within the
structure.
IMPORTANT:
See Limited Warranty information in Use and Care Manual.
6. The use of color coded low voltage wire is recommended
to simplify connections between the outdoor unit, the
thermostat and the indoor unit.
I. TROUBLESHOOTING
TROUBLESHOOTING CHART — WHAT TO CHECK
REFRIG
REFR
REF.
C
INE
R
RESTRICTED I.D.
Table 1 — NEC Class II Control Wiring
CO
ESTRICTED
O.D
O
CO
NTAC
FFICI
EXCE
IG
HIGH
ERANT
U
.D
N
TR
LO
IRC
STU
E
.
AIR REC
NO
.
FA
LOW
RAN
W
ENT CO
STAR
O
UIT RESTRICTIO
SS
OVERC
VO
LTAG
ER SUPPLY
VO
C
N
CO
CK
C
TXV
S
N
SPEED
L
TRANSFO
RU
ON
POW
T
VO
TO
IVE EVAP. LO
LTAGE
W
O.D
N
DERC
N
CAPACITOR
T
START
CAPACITOR
R
TAC
N
DE
R
CO
O
24 VOLTS
LTAGE FUSE
M
SUPERH
IR
CO
T
M
U
C
K
SYSTEM FAULTS
.
AIR
C
ULATION
PRESSO PRESSO
AIRFLO
TOR
E
W
NSAB
MPR. IO
SW
NTACTS
O
HARG
H
A
RM
ER
FLO
IR
IN
IR
IN
C
ELAY
ITCH
R
PEN
EA
LES
O
GE
AD
NS
W
W
IL
G
G
R
R
E
T
L
WIRE SIZE
18 AWG
16 AWG
14 AWG
MAX. WIRE LENGTH
150 FT
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
P
P
P
P
S
P
S
S
S
S
S
S
S
P
S
S
S
S
P
S
S
225 FT.
P
S
S
300 FT.
P
P
P
P
S
S
Compressor Runs Inadequate or No Cooling
S
P
S
S
7. Table 1 defines maximum total length of low voltage
ELECTRICAL
wiring from outdoor unit, to indoor unit, and to thermostat.
Compressor & O.D. Fan Do Not Start
Compressor Will Not Start But O.D. Fan Runs
O.D. Fan Won’t Start
P
P
P
P
P
P
P
S
S
P
P
P
S
S
P
P
P
P
P
P
S
8. Mount the indoor thermostat in accordance with instruc-
tion included with the thermostat. Wire per appropriate
hook-up diagram (included in these instructions).
Compressor Hums But Won’t Start
Compressor Cycles on IOL
I.D. Blower Won’t Start
P
P
P
P
S
S
S
P
S
P
S
S
S
S
S
S
P
P
F. COMPRESSOR START-UP
P - Primary Causes
S - Secondary Causes
After all electrical wiring is complete, SET THE THERMO-
STAT 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.
CHECKOUT PROCEDURE WITH MAIN POWER DISCONNECTS CLOSED (ON)
INDOOR THERMOSTAT
SWITCH SETTING
COMPONENT OPERATION
Indoor
Blower
Runs
Outdoor
Fan
Runs
3
Sump
Heater
Comp.
Furnace
Heat
Comes On
Compressor
Runs
Step
No.
Fan Switch
1
1
TO CHECK
Sump Heat
Off
X
Cool
Heat
Auto
On
1
2
3
4
X
X
X
X
X
Indoor Fan Operation
Cooling Operation
X
X
X
X
X
X
X
X
X
X
X
X
X
CheckingPerformance
& Charge
USE CHARTS ATTACHED TO O.D. UNIT
5
6
Heating
2
X
X
X
X
X
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
2
3
Also set thermostat dial to call for cooling or heating as necessary.
Check only necessary if heating unit is used for indoor section and wiring has been disturbed during installation of cooling equipment.
When applicable.
4
18-AC56D1-1
Installer’s Guide
TYPICAL FIELD HOOK-UP DIAGRAMS
PRINTED FROM B152901 P02
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.
LEGEND
FACTORY WIRING
FIELD WIRING
5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.
18-AC56D1-1
5
Installer’s Guide
SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT
The Trane company has always recommended installing
Trane approved matched indoor and outdoor systems.
R-22 SUBCOOLING CHARGING TABLE
All 13 SEER Trane split systems are ARI rated with only
TXV indoor systems.
DESIGN SUBCOOLING VALUES (°F)
LIQUID
TEMP.
(°F)
8
10
12
14
The benefits of installing approved indoor and outdoor split
systems are maximum efficiency, optimum performance and
the best overall system reliability.
LIQUID LINE PRESSURE (psi)
45
50
89
93
96
100
109
119
130
141
153
166
179
193
208
223
239
256
274
293
313
333
The following charging methods are therefore prescribed for
systems with indoor TXVs.
98
102
111
121
132
144
156
168
182
196
211
226
243
260
278
297
317
105
115
126
137
148
161
174
187
202
217
233
249
267
285
305
325
1. Subcooling (in the cooling mode) is the only recommended
method of charging above 55°F ambient temperatures.
55
107
117
128
139
151
163
176
190
205
220
236
253
271
289
309
60
2. For best results - the indoor temperature should be kept
between 70°F to 80°F. Add system heat if needed.
65
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.
70
75
4. Measure Liquid Line Temperature and Refrigerant
Pressure at service valves.
80
5. Determine total refrigerant line length, and height (lift)
if indoor section is above the condenser.
85
90
6. Determine the Design Subcool Charging Temperature
from the unit nameplate.
95
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 pres-
sure 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.
100
105
110
115
120
125
8. When system is correctly charged, you can refer to
System Pressure Curves (in Service Facts) to verify
typical performance.
SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE
60
50
40
30
25
20
15
10
0
Add 5 psig to Subcool Charging Table Pressure
Use Design Subcool Value from Table
Subtract 5 psig from S.C. Table Pressure
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
2TTB3018A
2TTB3024A
2TTB3030A
2TTB3036A
2TTB3042A
2TTB3048A
2TTB3060A
BASE FIG.
A
B
C
D
E
F
G
H
J
K
2
2
3
3
4
4
4
2
2
2
2
1
1
1
651 (25-5/8) 724 (28-1/2) 651 (25-5/8)
832 (32-3/4) 724 (28-1/2) 651 (25-5/8)
832 (32-3/4) 829 (32-5/8) 756 (29-3/4)
832 (32-3/4) 829 (32-5/8) 756 (29-3/4)
841 (33-1/8) 946 (37-1/4) 870 (34-1/4)
5/8
3/4
3/4
7/8
7/8
1/4
127 (5)
57 (2-1/4) 181 (7-1/8) 44 (1-3/4) 457 (18)
5/16 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
5/16 137 (5-3/8) 86 (3-3/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
3/8 137 (5-3/8) 86 (3-3/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
3/8
152 (6)
152 (6)
152 (6)
98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
98 (3-7/8) 219 (8-5/8) 86 (3-3/8) 508 (20)
From Dwg. 21D153074 Rev. 10
1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 1-1/8 3/8
1045 (41-1/8) 946 (37-1/4) 870 (34-1/4) 1-1/8 3/8
18-AC56D1-1
7
Installer’s Guide
Trane
A business of
American Standard Companies
Trane has a policy of continuous product and product data improvement and it reserves the right to change
design and specifications without notice.
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