TRANE 4TTX4 (01) PDF Document

The TRANE 4TTX4 unit contains R-410A refrigerant, which operates at 50% to 70% higher pressures than R-22. It is critical to use only R-410A approved service equipment.

For service, use ONLY R-410A refrigerant and approved POE (Polyolester) compressor oil. All R-410A systems use a POE oil that readily absorbs moisture from the atmosphere. To limit this “hygroscopic” action, the system should remain sealed whenever possible.

Follow these steps for the location and preparation of your TRANE 4TTX4 unit:

1. After uncrating, check for any transportation damage and report it promptly to the carrier.

2. To remove the unit from the pallet, notice the tabs on the basepan. Remove these tabs by cutting with a sharp tool.

3. The unit should be set on a level support pad at least as large as the unit base pan, such as a concrete slab.

Proper location and clearance are essential for the performance of your TRANE 4TTX4 unit:

1. The support pad must NOT be in direct contact with any structure.

2. The unit must be positioned a minimum of 12 inches from any wall or surrounding shrubbery to ensure adequate airflow. Do not locate the unit close to bedrooms.

3. Clearance must be provided in front of the control box (access panels) and any other side requiring service access to meet National Electrical Code.

4. The location must be far enough away from any structure to prevent excess roof run-off water from pouring directly on the unit.

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

6. If the unit is mounted on a roof, ensure the roof can support the unit’s weight. Properly selected isolation is recommended to prevent sound or vibration transmission to the building structure.

The refrigerant line limitations for the TRANE 4TTX4 are as follows:

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

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

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

Note: For further details, refer to “Refrigerant Piping Software” Pub. No. 32-3312-0*, and “Refrigerant Piping Manual Pub. No. 32-3009-0* (the position of the * denotes the latest revision no.)

The TRANE 4TTX4 units have provisions for braze connections. The gas line must always be insulated. Follow these steps to install the refrigerant lines:

1. Determine the most practical way to run the lines, considering bends and space limitations. Note that large diameter tubing will be very difficult to rebend once shaped.

2. Determine the best starting point for routing the tubing – inside or outside the structure.

3. Provide a pull-through hole of sufficient size for both liquid and gas lines.

4. Be sure the tubing is of sufficient length.

5. Uncoil the tubing carefully to avoid kinks or dents.

6. Route the tubing, making all required bends and securing it properly before making connections.

7. To prevent noise from vibration transmission, take the following precautions:

a. When fastening refrigerant lines to floor joists or other framing, use isolation-type hangers.

b. Use isolation hangers when lines are run in stud spaces or enclosed ceilings.

c. Insulate and isolate lines where they run through a wall or sill.

d. Isolate the lines from all ductwork.

Follow these steps for brazing the refrigerant lines on your TRANE 4TTX4:

1. Remove the lower access cover to access the service valves.

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

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

4. Insulate the entire gas line and its fittings. Do NOT allow uninsulated liquid line to come in direct contact with the bare gas line.

5. 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. Use care to ensure no moisture enters the pressure tap port while the wet rag is being used.

6. To avoid heat damage to the basepan, it is recommended to keep the flame directly off of the basepan.

7. Use a Dry Nitrogen Purge and a Brazing Alloy without flux. Flow dry nitrogen into either valve pressure tap port, through the tubing, and out the other port while brazing.

8. Braze using accepted good brazing techniques.

After brazing the refrigerant lines to both the outdoor and indoor units, you must check the field-brazed connections for leaks. IMPORTANT: Replace the pressure tap port valve core before attaching hoses for evacuation.

Pressurize the indoor unit and field refrigerant lines with dry nitrogen to 350-400 psi through the service valve ports. Use soap bubbles or other leak-checking methods to ensure all field joints are leak-free. If a leak is found, release the pressure and then repair the joint.

Since the outdoor unit has a refrigerant charge, the gas and liquid line valves must remain closed during evacuation. Follow these steps:

1. After completing the leak check, evacuate the refrigerant lines and indoor coil before opening the gas and liquid line valves.

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

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

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

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

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

7. With the vacuum pump and micron gauge blanked off, open the valve on the R-410A cylinder and charge the refrigerant lines and indoor coil with vapor to the tank pressure of the R-410A supply.

After system evacuation and charging the lines, follow these steps to open the service valves. Do not vent refrigerant into the atmosphere.

1. Close the valve on the R-410A supply cylinder. Close the valves on the manifold gauge set and remove the refrigerant charging hoses from the liquid and gas pressure tap ports.

2. To open the liquid line shut-off valve, remove the valve stem cap (requires a 3/4″ Open End wrench). Insert a 3/16″ Allen wrench into the stem and turn it counterclockwise until the stem just touches the rolled edge (approximately five turns). WARNING: Extreme caution should be exercised. Turn the valve stem counterclockwise only until the stem contacts the rolled edge. No torque is required.

3. Replace the liquid service pressure tap port cap and valve stem cap. These caps MUST BE REPLACED to prevent leaks. Finger tighten the caps, then tighten an additional 1/6 turn.

4. To open the gas valve, remove the shut-off valve cap. Using a 1/4″ Open End or Adjustable wrench, turn the valve stem 1/4 turn counterclockwise.

5. Replace the gas valve stem cap to prevent leaks. Finger tighten the cap and pressure tap cap, then tighten an additional 1/6 turn.

If refrigerant lines are longer than 15 feet or a different size than recommended, the system refrigerant charge must be adjusted. Refer to the unit Service Facts.

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. The power supply must agree with the 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.

7. Mount the indoor thermostat in accordance with instructions included with the thermostat. Wire per the appropriate hook-up diagram.

8. The table below defines the maximum total length of low voltage wiring from the outdoor unit, to the indoor unit, and to the thermostat.

After all electrical wiring is complete, follow these steps for the initial compressor start-up:

1. Set the thermostat system switch to the OFF position so the compressor will not run.

2. Apply power by closing the system main disconnect switch. This will activate the compressor sump heat (where used).

3. Do not change the Thermostat System Switch from OFF until power has been applied for one (1) hour. Following this procedure will prevent a potential compressor overload trip at the initial start-up.

Please observe the following notes when performing the wiring for your TRANE 4TTX4:

1. Be sure the power supply agrees with the equipment nameplate.

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

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

4. If using two outdoor thermostats, ODT-B must be set lower than ODT-A.

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

Refer to the following chart to troubleshoot system faults on your TRANE 4TTX4. “P” indicates a Primary Cause, and “S” indicates a Secondary Cause.

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.

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.

With the main power disconnects closed (ON), use the following table to check component operation by adjusting the indoor thermostat switch settings.

The following table provides the outline dimensions for TRANE 4TTX4 models. All dimensions are in MM (Inches).