Trane 2TTB3030A, 2TTB3036A, 2TTB3042A, 2TTB3048A, 2TTB3060A Installer's Manual
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18-BC56D1-5
Installer’s Guide
Replacement Condensing Units
2TTB3/2TWB3
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.
NOTICE:
This outdoor unit is designed as a component replacement
option for existing HCFC 22 systems. This system is
shipped with a DRY NITROGEN charge and does not contain
HCFC 22.
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.
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:
The manufacturer has always recommended installing
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.
1
5 FT. ABOVE UNIT — UNRESTRICTED
B. LOCATION AND PREPARATION OF THE UNIT
(INFORMATION APPLICABLE TO HEAT PUMPS ONLY)
This Heat Pump has been designed and manufactured to
withstand and operate in severe winter conditions.
However, there are precautionary steps which should be
taken at the time of installation which will help assure
the efficient operation of the unit. It is recommended
that these precautions be taken for units being
installed in areas where snow accumulation and
prolonged below freezing temperatures occur.
1. Units should be elevated 3 to 12 inches above the pad or
rooftop, depending on local weather. This additional height
will allow better drainage of snow and ice (melted during
defrost cycle) prior to its refreezing. This should prevent a
build-up of ice around the unit which occurs when unit is
not elevated. Insure that drain holes in unit base pan
are not obstructed preventing draining of defrost
water.
2. If possible, avoid locations that are likely to accumulate
snow drifts. If not possible, a snow drift barrier should be
installed around the unit to prevent a build-up of snow on
the sides of the unit and should be of sufficient distance
from the unit to prevent restriction of airflow to and from
the unit. Also allow for proper maintenance space. The
barrier should be constructed of materials which will
blend in with the building design.
3. Avoid locating the unit where condensation and freezing
of defrost vapor may annoy the customer. For instance,
installing the unit under a bedroom, kitchen, or picture
window may be annoying to the customer since condensate and fog will occur during the defrost cycle.
4. Avoid locating the unit under the eaves or other overhead
structures as sizeable icicles may form and the unit may
be damaged by these falling icicles.
Installer’s Guide
2
(INFORMATION APPLICABLE TO ALL UNITS)
1. When removing unit from the pallet, notice the tabs on
2. The unit should be set on a level support pad at least as
3. The support pad must NOT be in direct contact with any
4. The top discharge area must be unrestricted for at least
5. When the outdoor unit is mounted on a roof, be sure the
6. The maximum length of refrigerant lines from outdoor to
7. If outdoor unit is mounted above the air handler, maxi-
NOTE:
Refer to “Refrigerant Piping Software” Pub. No. 32-3312-0*
(the position of the * denotes the latest revision number).
The outdoor unit must be properly matched to the indoor
unit. Refer to Application Bulletin # SCC-APG009-EN.
If using existing refrigerant lines make certain that all joints
are brazed, not soldered.
In scroll compressor applications, dome temperatures may
be hot. Do not touch top of compressor, may cause minor
to severe burning.
BASEPAN TAB
REMOVAL
the basepan. Remove tabs by cutting with a sharp tool as
shown in Figure 2.
large as the unit base pan, such as a concrete slab. If this
is not the application used please refer to application
bulletin SSC-APG001-EN.
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).
five (5) feet above the unit.
roof will support the unit’s weight. Properly selected
isolation is recommended to prevent sound or vibration
transmission to the building structure.
indoor unit should NOT exceed sixty (60) feet.
mum 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).
!
CAUTION
!
CAUTION
NOTE:
The refrigerant charge specified on the data plate is the
system charge plus 15 feet of rated line set.
C. 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 nitrogen 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 nitrogen 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. Before brazing, remove plugs from external copper stub
tubes. Clean internal and external surfaces of stub tubes
prior to brazing.
2. Cut and fit tubing, minimizing the use of sharp
90° bends.
3. Insulate the entire gas line and its fittings.
4. Do NOT allow uninsulated liquid line to come in direct
contact with bare gas line.
5. 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.
6. 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.
7. Braze using accepted good brazing techniques.
LEAK CHECK
IMPORTANT:
Replace pressure tap port valve core before attaching hoses for
evacuation.
Final refrigerant charge adjustment is necessary. Use
the Subcooling Charging procedure in the outdoor unit
Service Facts.
© 2012 Trane 18-BC56D1-5
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
Installer’s Guide
3
LIQUID LINE SERVICE VALVE
lines with dry nitrogen to 150 psi. Use soap bubbles or other
leak-checking methods to see that all field joints are leakfree! If not, release pressure; then repair!
SYSTEM EVACUATION
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. The outdoor unit ships with a holding charge of dry
nitrogen. The nitrogen should be removed and the entire
system must be evacuated. Remove the refrigerant
connection seal caps and open the service gas and liquid
valves slowly to release the nitrogen from the unit.
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.
4. Attach center hose of manifold gauges to the vacuum
pump once the nitrogen pressure has been relieved.
5. Evacuate until the micron gauge reads no higher than
350 microns.
6. 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.
7. If vacuum gauge does not rise above 500 microns in
one (1) minute, the evacuation should be complete.
8. With vacuum pump and micron gauge blanked off,
weigh in HCFC 22 refrigerant based on the outdoor
unit data plate and refrigerant line set length adjustments noted on page 1 of the Service Facts.
9. Close valve on HCFC-22 supply cylinder when the
appropriate refrigerant charge has been achieved.
10. Replace gas and liquid service caps. These caps MUST
BE REPLACED to prevent leaks. Replace caps by
finger tightening, then tighten an additional 1/6 turn.
GAS LINE SERVICE VALVE
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.
D. 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.
4
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-BC56D1-5 3
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