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.  
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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