Trane 2TTA0036A, 2TTA0048A, 2TTA0030A,2TTA0036A,2TTA0042A,2TTA0048A,2TTA0060A,2TTA0072A,2TTA2030A,2TTA2036A,2TTA2042B,2TTA2048A,2TTA2060A, 2TTA0042A, 2TTA0030A Installer's Manual

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Page 1
2TTA2-IN-1B
18-AC51D3-3
Installer’s Guide
Condensing Units
2TTA2, 2TTA0
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

The following instructions cover 2TTA2 and 2TTA0; Con­densing Units.
NOTICE: These outdoor units may be used with indoor units equipped with Thermostatic Expansion Valve or Accutron Flow Control Check Valve (F.C.C.V.) assembly for refrigerant flow control only.
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 & 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. 32-3312-02.
8. Locate and install indoor coil or air handler in accor­dance with instruction included with that unit.
Page 2
Installer’s Guide
2
BASEPAN TAB REMOVAL

C. ACCUTRON FLOW CONTROL VALVE

If the indoor unit System Refrigerant Flow control is an Accutron™ orifice and check valve assembly, an orifice size change may be necessary. See Figure 3.
The outdoor model determines the required orifice size. Check the listed orifice size on nameplate of the selected outdoor model. If the indoor unit is factory shipped with a different orifice size, the orifice must be changed to obtain system rated performance.
IMPORTANT:
The outdoor unit is shipped with the proper size orifice and a stick-on orifice size label in an envelope attached to the outdoor unit. Outdoor unit nameplate will have correct orifice size specified as BAYFCCV---A for rated performance.

D. 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.
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.

E. 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 4) 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 5.

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.
The units are factory charged with the system charge required when using fifteen (15) feet of connecting line. Unit nameplate charge is the same.
Final refrigerant charge adjustment is necessary. Use the Charging Charts 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.
© 2002 American Standard Inc. All Rights Reserved 18-AC51D3-3
3
BRAZE TYPE INDOOR END
SEALING CAP
ADAPTER
ACCUTRON COMPONENTS
BODY
AS SHIPPED
TM
FLOW CONTROL CHECK VALVE (F.C.C.V.) ORIFICE
FIELD SUPPLIED LIQUID LINE
Page 3
Installer’s Guide
4
LIQUID LINE SERVICE VALVE
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.
NOTICE: Use care to make sure that no moisture enters pressure tap port, while wet rag is being used.
NOTICE: Precautions should be taken to avoid heat damage to basepan during brazing. It is recommended to keep the flame directly off of the basepan.
GAS LINE SERVICE VALVE
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.
NOTE: DO NOT VENT REFRIGERANT INTO THE ATMOSPHERE.
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.
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.
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.
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.
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
5
GAS LINE BALL SERVICE VALVE
UNIT SIDE OF VALVE
COOLING
CAP
PRESSURE TAP PORT
GAS LINE CONNECTION
CAP
CORE
1/4 TURN ONLY COUNTERCLOCKWISE FOR FULL OPEN POSITION
VALVE STEM
BODY
18-AC51D3-3 3
Page 4
Installer’s Guide
rolled edge (approximately five [5] turns) observing WARNING statement on page 2. See Figure 4.
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. For a ball type gas valve, 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 5. For brass gas line service valve opening, follow 9 and 10 above. 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 5.
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 unit Service Facts.

F. ELECTRICAL CONNECTIONS

!
CAUTION
Three phase scroll compressors will run in reverse if powered up with improper phasing. If the compressor is running backwards there will be little or no difference in suction and discharge pressure and it will make a distinct louder sound. Reversing any two of the field installed power leads will correct the compressor rotation. change the power leads to correct compressor rotation may result in compressor damage during operation.
!
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
Failure to
8. Mount the indoor thermostat in accordance with instruc­tion included with the thermostat. Wire per appropriate hook-up diagram (included in these instructions).

G. 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.
H. OPERATIONAL AND CHECKOUT
PROCEDURES
Final phases of this installation are the unit Operational and Checkout Procedures which are found in this instruction (see page 8). To obtain proper performance, all units must be operated and charge adjustments made in accordance with procedures found in the Service Facts.

I. ELECTRIC HEATERS

Electric heaters, if used, are to be installed in the air han­dling device according to the instructions accompanying the air handler and the heaters.

J. OUTDOOR THERMOSTAT

An outdoor thermostat TAYSTAT250B may be field installed. For data, see wiring diagram attached to unit and instruction sheet packaged with outdoor thermostat.

K. 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.

L. TROUBLESHOOTING

TROUBLESHOOTING CHART — WHAT TO CHECK
CONTROL TRANSFORMER
HIGH VOLTAGE WIRING
POWER SUPPLY
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 Liquid Refrig. Floodback Capillary Tube 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
CONTACTOR CONTACTS
START CAPACITOR
RUN CAPACITOR
START RELAY
COMPR. IOL
P
P
P
S
P
P
P
P
P
P P
P
P
S
SPP
LOW VOLTAGE WIRING
P
PPS
REFRIGERANT UNDERCHARGE
REFRIGERANT OVERCHARGE
INEFFICIENT COMPRESSOR
STUCK COMPRESSOR
LOW VOLTAGE FUSE
CONTACTOR COIL
SSPPPP
S
P
RESTRICTED O.D. AIRFLOW
EXCESSIVE EVAP. LOAD
NONCONDENSABLES
P
P
S
P
S
S
P P P
S
S
S PSPSS S S S
REF. CIRCUIT RESTRICTIONS
RESTRICTED I.D. AIRFLOW
O.D. AIR RECIRCULATION
P
P
PSS
O.D. FAN SPEED SWITCH
TXV STUCK OPEN
SUPERHEAT
PSS
S
S
S
P S
P
S
S
S
S
P P P
S
S S
S
S S
S S
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.
4 18-AC51D3-3
Page 5
Installer’s Guide

TYPICAL FIELD HOOK-UP DIAGRAMS

PRINTED FROM B152901 P02
NOTE
*
PRINTED FROM B152908 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.
5. If outdoor thermostats (ODT) are not used, connect W1 to W2 and W3.
PRINTED FROM B152907 P03
W2 present only on 2 stage
*
thermostat and furnace
LEGEND
FACTORY WIRING FIELD WIRING
18-AC51D3-3 5
Page 6
Installer’s Guide

2TTA OUTLINE DRAWING

Note: All dimensions are in MM (Inches).
MODELS BASE FIG. A B C D E F G H J K
2TTA0030A 2 2 651 (25-5/8) 724 (28-1/2) 651(25-5/8) 3/4 5/16 127 (5) 57 (2-1/4) 181 (7-1/8) 44 (1-3/4) 457 (18)
2TTA0036A 2 2 651 (25-5/8) 724 (28-1/2) 651(25-5/8) 7/8 3/8 127 (5) 57 (2-1/4) 181 (7-1/8) 44 (1-3/4) 457 (18)
2TTA0042A 2 2 730 (28-3/4) 724 (28-1/2) 651(25-5/8) 7/8 3/8 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2TTA0048A 2 2 730 (28-3/4) 724 (28-1/2) 651(25-5/8) 1-1/8 3/8 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2TTA0060A 3 1 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 1-1/8 3/8 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2TTA0072A 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)
2TTA2030A 2 2 730 ( 28-3/4) 724 (28-1/2) 651( 25-5/8) 3/4 3/8 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2TTA2036A 2 2 832 (32-3/4) 724 (28-1/2) 651( 25-5/8) 7/8 3/8 137 (5-3/8) 65 (2-5/8) 210 (8-1/4) 57 (2-1/4) 457 (18)
2TTA2042B 3 1 832 (32-3/4) 829 (32-5/8) 756 (29-3/4) 1-1/8 3/8 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2TTA2048A 3 1 933 (36-3/4) 829 (32-5/8) 756 (29-3/4) 1-1/8 3/8 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
2TTA2060A 3 1 933 (36-3/4) 829 (32-5/8) 756 (29-3/4) 1-1/8 3/8 143 (5-5/8) 92 (3-5/8) 210 (8-1/4) 79 (3-1/8) 508 (20)
From Dwg. 21D153074 Rev. 5
6 18-AC51D3-3
Page 7

MOUNTING HOLE LOCATION

Note: All dimensions are in MM (Inches).
Installer’s Guide
NOTE: For model base size,
18-AC51D3-3 7
see table on page 6.
From Dwg. 21D152989 Rev. 0
Page 8
Installer’s Guide

CHECKOUT PROCEDURE

After installation has been completed, it is recommended that the entire system be checked against the following list:
1. Refrigerant Line, Leak checked .................................. [ ]
2. Suction Lines and Fittings properly insulated ........... [ ]
3. Have all Refrigerant Lines been secured and
isolated properly? ........................................................ [ ]
4. Have passages through masonry been sealed? If mortar is used, prevent mortar from coming
into direct contact with copper tubing ........................ [ ]
5. Verify tightness of all electrical connects ................... [ ]
6. Observe outdoor fan during on cycle for clearance
and smooth operation ................................................. [ ]
7. Indoor coil drain line drains freely. Pour water
into drain pan .............................................................. [ ]

CHECKOUT PROCEDURE WITH MAIN POWER DISCONNECTS CLOSED (ON)

INDOOR THERMOSTAT
SWITCH SETTING
Step
No.
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
5 Heating 6 Inform owner on how to operate system and what to expect of it. At the same time deliver Owners Use and Care Booklet.
TO CHECK Off Cool Heat Auto On
& Charge
2
11
Fan Switch
XX X X X
8. Supply registers and return grilles open and
unobstructed ............................................................... [ ]
9. Return air filter installed ............................................ [ ]
10. Thermostat thermometer is accurate. Check against a reliable thermometer. Adjust per
instructions with thermostat ...................................... [ ]
11. Is correct speed tap being used?
(Indoor blower motor) ................................................. [ ]
12. Operate complete system in each mode to
insure safe operation. .................................................. [ ]
COMPONENT OPERATION
Indoor Outdoor
Blower Fan
Runs Runs Heater Comes On
Compressor
Runs
3
Comp. Furnace
Sump Heat
USE CHARTS ATTACHED TO O.D. UNIT
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.
Trane A business of American Standard Companies www.trane.com
Literature Order Number P.I. File Number Supersedes Stocking Location
Trane has a policy of continuous product and product data improvement and it reserves the right to change design and specifications without notice.
2TTA2-IN-1B SV-UN-S/S-2TTA2-IN-1B 8/02 2TTA2-IN-1A 6/02 PI Louisville & Webb/Mason-Houston
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