Trane Odyssey TTA0724 A/D B Series Application Manual
Split system air conditioners, tube size and component selection, 6-25 tons
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Application Guide
Split System Air Conditioners
Odyssey™
Tube Size and Component Selection
TTA and TWA (6-25 Tons)
(TTA Models)
TTA0724*A/D****B
TTA0904*A/D****B
TTA1204*C/D****B
TTA1504*D****B
TTA1804*C/D****B
TTA2404*C/D****B
TTA3004*C****B
(TWA Models)
TWA0724*A/D****B
TWA0904*A/D****B
TWA1204*A/D****B
TWA1804*D****B
TWA2404*D****B
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment
can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or
serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
June 2022
SAFETY WARNING
SS-APG008H-EN
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Summary of Contents for Trane Odyssey TTA0724 A/D B Series
- Page 1 Application Guide Split System Air Conditioners Odyssey™ Tube Size and Component Selection TTA and TWA (6-25 Tons) (TTA Models) TTA0724*A/D****B TTA0904*A/D****B TTA1204*C/D****B TTA1504*D****B TTA1804*C/D****B TTA2404*C/D****B TTA3004*C****B (TWA Models) TWA0724*A/D****B TWA0904*A/D****B TWA1204*A/D****B TWA1804*D****B TWA2404*D****B SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
- Page 2 (HCFCs). Not all refrigerants containing these compounds bump cap, fall protection, electrical PPE and arc have the same potential impact to the environment. Trane flash clothing). ALWAYS refer to appropriate advocates the responsible handling of all refrigerants-...
- Page 3 This document and the information in it are the property of regulations. Trane, and may not be used or reproduced in whole or in part without written permission. Trane reserves the right to revise this publication at any time, and to make changes to...
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Page 4: Table Of Contents
Table of Contents Overview........5 Line Sizing . -
Page 5: Overview
Overview Trane’s TTA and TWA, 6 – 25 ton condensing unit product Figure 1. Interconnecting refrigerant lines in a typical split air-conditioning system line (specific model numbers are listed on the cover) has been designed for use only with R-410A and POE oil. R-... -
Page 6: Suction Lines
Interconnecting lines of 150 lineal ft (45.7 m) or less do not been published. Trane has used ASHRAE data to create require Trane review, but only a limited amount may be in a equation-based formulas to predict the entrainment riser, see allowable elevation difference figures in the velocities of R-410A refrigerant and POE oil. -
Page 7: Refrigerant Piping Guidelines
Overview Refrigerant Piping Guidelines Figure 2. Allowable elevation difference: TTA above indoor unit For TTA units, contact the manufacturer for review. Figure 3. Allowable elevation difference: TWA above indoor unit Not allowed for TWA units. Note: Regardless of orientation, hot gas bypass (HGBP) lines are limited to 75 feet. See Hot Gas Bypass Installation Guideline for Direct Expansion (DX) Equipment APP-APG017*-EN for more details SS-APG008H-EN... - Page 8 Overview Figure 4. Allowable elevation difference: TTA or TWA below indoor unit For TTA units contact manufacturer for review. Not allowed for TWA units. Acceptable liquid-riser height based on total liquid-line length (below indoor unit) Note: Route refrigerant piping for minimum linear length, minimum number of bends and fittings. Important: Read Application Guide SS-APG008*–EN thoroughly before installing this unit.
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Page 9: Selection
Again, system designs outside the application required, the installer should use a drop solenoid—open envelope of the TTA/TWA unit require Trane review. when the compressor is on, and off when the compressor is off. If used, the solenoid requires code compliant wiring Insulation to the TTA condensing unit. -
Page 10: Gas Line
Line Sizing, Routing, and Component Selection Check Valves WARNING Risk of Explosion with Refrigerant Line! WARNING Failure to follow instructions could cause a refrigerant Risk of Explosion with Refrigerant Line! line to explode under pressure which could result in Failure to follow instructions could cause a refrigerant death or serious injury. -
Page 11: Insulation
Line Sizing, Routing, and Component Selection DETINT • Rise at least 1 ft (30 cm) from the common low point to prevent any off-cycle condensed refrigerant in the coil The riser DETINT (Double-Elbow That Is Not a Trap) does from attempting to flow to the compressor. not retain oil during unit operation. -
Page 12: Expansion Valves
Expansion Valves Expansion valves meter refrigerant into the evaporator Each TXV should be selected for 5 tons. However, care under controlled conditions. If there is too much refrigerant, should be taken to ensure the condensing unit is capable of the refrigerant will not completely vaporize and the operating at these conditions. -
Page 13: Controls
Controls The TTA/TWA unit is available with either Symbio™ or once the compressor turns off, it should be allowed to stay thermostat control. It is important to understand that if the off until the crank case heater has warmed up. staging of compressors is turned over to a third party, the System stability must be programmed in the third party compressor protection, provided through system stability, is... -
Page 14: Hot Gas Bypass
• Refer to the Trane Application Guide Hot Gas Bypass Trane now has more than 15 years experience in the Installation Guideline for Direct Expansion (DX) successful use of packaged rooftop equipment without hot Equipment (APP-APG017*- EN) for more information gas bypass in commercial comfort-cooling applications. -
Page 15: Remodel, Retrofit, Or Replacement
After all components have been drained, concerns with R-410A, please contact your local the amount of residual mineral oil will have a negligible Trane representative. effect on performance and reliability. Important: The system should not be open for longer... -
Page 16: Microchannel Heat Exchanger Condensers
Microchannel Heat Exchanger Condensers (MCHE) The microchannel heat exchanger (MCHE) condenser This design improves heat transfer and the refrigerant that design is quite similar to the design of an automobile enters the coil quickly turns to liquid. The MCHE tube radiator. -
Page 17: Refrigerant Piping Examples
Refrigerant Piping Examples Figure 7. TTA cooling-only unit and TWE air handler Notes: 1. If the total length of the liquid line exceeds 80 ft (24 m), remove the liquid-line filter drier from the TTA and install a new one (Table 2, p. - Page 18 Refrigerant Piping Examples Figure 9. TWA heat pump and TWE air handler (typical arrangement shown in cooling mode) bi-directional heat pump lter bi-directional heat pump lter Notes: 1. For applications where the length of the liquid line exceeds 80 ft (24 m) and the heat pump will start in the cooling mode, remove the liquid-line filter driers from the TWA heat pump and install new filter driers and check valves at the TWE air handler.
- Page 19 Refrigerant Piping Examples Figure 10. TWA heat pump and matched indoor coil (typical arrangement shown in cooling mode) bi-directional heat pump lter bi-directional heat pump lter Notes: 1. Each coil distributor requires one thermal expansion valve (TXV) and one check valve. See Table 3, p.
- Page 20 Refrigerant Piping Examples Figure 11. Indoor coil (non-TWE) with one distributor (single-circuit TTA/TWA units) Notes: 1. Pitch the liquid line 1 inch per 10 feet (1 cm per 3 m) so that the liquid refrigerant drains toward the indoor coil. Use the liquid-line size recommended in Table 2, p.
- Page 21 Refrigerant Piping Examples Figure 12. Indoor coil with two distributors (single-circuit TTA/TWA units) Notes: 1. Pitch the liquid line 1 inch per 10 feet (1 cm per 3 m) so that the liquid refrigerant drains toward the indoor coil. Use the liquid-line size recommended in Table 2, p.
- Page 22 Refrigerant Piping Examples Figure 13. Indoor coil with two distributors (dual-circuit TTA/TWA units) Indoor coil with Intertwined circuiting liquid line (circuit 2) liquid line distributor (circuit 1) TXV — sight see INSET glass TXV — sight see INSET glass distributor Notes: 1.
- Page 23 Refrigerant Piping Examples Figure 14. Type UF evaporator coil with four distributors Evaporator Coil with Horizontal-Split suction line thermal expansion (Standard) Circuiting valves (TXV) liquid line sight glass filter drier distributor Evaporator Coil with suction line Intertwined Circuiting thermal expansion valves (TXV) liquid line...
- Page 24 Refrigerant Piping Examples Figure 15. Indoor coil with four distributors (dual-circuit TTA/TWA units) Notes: 1. Pitch the liquid line 1 inch per 10 feet (1 cm per 3 m) so that the liquid refrigerant drains toward the indoor coil. Use the liquid-line size recommended in Table 2, p.
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Page 25: Parts
Parts Table 2. Component selection for TTA cooling microchannel units 6–25 tons Unit TTA0724*A TTA0724*D TTA0904*A TTA0904*D TTA1204*D TTA1204*C TTA1504*D Refrigerant ckts 1 (Manifold) Minimum step (tons) GAS LINE Tube diameter (in.) Horizontal (& drops) 1 1/8 1 1/8 1 1/8 1 3/8 1 1/8 Vertical (up) - Page 26 The tonnage range is the maximum design tonnage for the system. The TXV is capable of additional turn down below the maximum capacity. Contact your local Trane office for questions on TXV turndown. When sizing TXVs, select the TXV where the design tonnage is close to the middle of the device.
- Page 27 Parts Table 5. R-410A lbs charge per 100 ft Liquid Discharge Suction 0.04 1.25 0.18 5/16 0.07 2.15 0.31 0.12 3.45 0.51 0.22 6.43 0.94 0.36 10.33 1.51 0.53 15.42 2.26 0.74 21.42 3.14 1 1/8 1.26 36.52 5.36 1 3/8 1.93 55.63 8.16...
- Page 28 For more information, please visit trane. com or tranetechnologies.com. Trane has a policy of continuous product and product data improvements and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.