Trane BCHC Application Manual
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Trane BCHC Application Manual

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Application Guide
Tube Size and Component Selection
for Systems Comprised of BCHC and BCVC Blower Coils, Paired
With R-410A Condensing Units and Heat Pump Units
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.
May 2020
SAFETY WARNING
SS-APG010C-EN

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  • Page 1 Application Guide Tube Size and Component Selection for Systems Comprised of BCHC and BCVC Blower Coils, Paired With R-410A Condensing Units and Heat Pump Units 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 3 CFCs such as HCFCs and HFCs. Responsible Refrigerant Practices! Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures.
  • Page 4 R-22 refrigerant. Use ONLY R-410A rated service equipment or components with this unit. For specific handling concerns with R-410A, please contact your local Trane representative. Failure to use R-410A rated service equipment or components could result in equipment or components exploding under R-410A high pressures which could result in death, serious injury, or equipment damage.
  • Page 5 This application guide provides refrigerant piping guidelines for Trane® split system outdoor unit models ranging in capacity from 1.5 to 10 tons when matched to Trane® indoor models BCHC and BCVC 024 through 090. Use the information presented here to properly select interconnecting piping and refrigerant components for these systems.

  • Page 6: Table Of Contents

    Table of Contents Introduction ............iii Overview .

  • Page 7: Overview

    Trane’s 4TTA3, 4TWA3, 4TTB3 and 4TWB3 sizes 1-1/2 through 5 ton and TTA073D and TWA120D sizes 5 through 10 ton cooling only and heat pump products have been matched to Trane® indoor unit models BCHC and BCVC 024 through 090. Beginning mid-2009, the TTA and TWA 6- through 20-ton product line has been designed for use only with R-410A and POE oil (check unit model number for specific refrigerant).

  • Page 8: Updated Guidelines

    Overview Figure 1. Interconnecting refrigerant lines in a typical split air-conditioning system vapor or gas line The origin of the requirements for equivalent line lengths of components, line pressure drop, and minimum and maximum refrigerant velocities is uncertain. It appears likely that at least some of the supporting data was derived from measurements and/or equations involving water.

  • Page 9: Suction Lines

    • Use only horizontal and vertical piping configurations. Interconnecting lines of 150 lineal feet (45.7m) or less do not require Trane review, but be sure to limit the length in risers. Be sure to review the required accessories for long lengths.
  • Page 10 Overview Figure 2. Allowable elevation difference: R-410A cooling-only unit above indoor unit. (4) TT blower coil Figure 3. Allowable elevation difference: R-410A heat pump unit above indoor unit (4) TW blower coil Figure 4. Allowable elevation difference: R-410A cooling only or heat pump unit below indoor unit blower coil...

  • Page 11: Line Sizing, Routing, And Component Selection

    All new (4) TTA/TWA units and BCHC/BCVC units are R-410A products, and all the selected components installed in the field must also be rated for use with R-410A.

  • Page 12: Routing

    Figure 4, p. 4, depict the permissible rise in the liquid line (without excessive loss of subcooling). Again, system designs outside the application envelope of the TTA/TWA unit require Trane review. Insulation The liquid line is generally warmer than the surrounding air, so it does not require insulation. In fact, heat loss from the liquid line improves system capacity because it provides additional subcooling.

  • Page 13: Gas Line

    Be sure to consult the product data catalogue to determine if the crankcase heater ships with the unit. If it does not, a Trane field- installed crankcase heater may be obtained from your local sales office.

  • Page 14: Insulation

    Line Sizing, Routing, and Component Selection reliability. R-410A is hygroscopic. Even small amounts of moisture in the system introduced during installation can harm the compressor. If refrigeration lines must be installed below grade, consult your local sales engineer, territory manager, or field service representative. Insulation Any heat that transfers from the surrounding air to the cooler gas lines increases the load on the condenser (reducing the system’s air-conditioning capacity) and promotes condensate formation.

  • Page 15: Expansion Valves

    Expansion Valves Expansion valves meter refrigerant into the evaporator under controlled conditions. If there is too much refrigerant, the refrigerant will not completely vaporize and the remaining liquid will slug the compressor. If there is too little refrigerant, there may not be enough cooling for the compressor. Table 4, p.

  • Page 16: Controls

    Controls ReliaTel™ or thermostat control may be available on some model (4) TTA/TWA units. It is important to understand that if the staging of compressors is turned over to a third party, the compressor protection, provided through system stability, is also turned over to the third party. Simply stated, this means that when a compressor turns on, it shouldn’t turn off until the expansion valve comes under control.

  • Page 17: Hot Gas Bypass

    Trane now has several years of successful experience with Evaporator Defrost Control (EDC). Like hot gas bypass, the EDC system protects the coil from freezing, but it does so by turning off compressors when a sensor detects the formation of frost on the evaporator coil.

  • Page 18: Refrigerant Piping Examples

    Refrigerant Piping Examples Figure 6. Indoor coil (non-TWE) with one distributor (single-circuit TTA/TWA units) 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 3, p.
  • Page 19 Refrigerant Piping Examples Figure 7. Indoor coil with two distributors (dual TTA/TWA units) 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 3, p.
  • Page 20 Refrigerant Piping Examples Figure 8. Indoor coil with two distributors (single-circuit TTA/TWA units) 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 3, p.

  • Page 21: Heat Pump And Blower Coil Matches

    2625-3375 6 row** TWA090DC 3500-4500 6 row** TWA120D * These units must have 350-400 cfm/nominal ton and a minimum mixed air temp of 60°F in heating. ** Coils require 144 FPF fin spacing, which is standard on the BCHC/BCVC product.

  • Page 22: Parts

    Parts Table 3. Component selection summary 4TTA3018A 4TTA3024A 4TTA3030A 4TTA3036A 4TTA3042A 4TTA3048A 4TTA3060A 4TTB3018A 4TTB3024A 4TTB3030A 4TTB3036A 4TTB3042A 4TTB3048A 4TTB3060A 4TWA3018A 4TWA3024A 4TWA3030A 4TWA3036A 4TWA3042A 4TWA3048A 4TWA3060A TTA073D TTA090D TTA120D UNIT 4TWB3018A 4TWB3024A 4TWB3030A 4TWB3036A 4TWB3042A 4TWB3048A 4TWB3060A TWA073D TWA090D TWA120D Refrigerant ckts Minimum step (tons)
  • Page 23 Table 4. Expansion valves Model Number Refrigerant Manufacturer Tonnage Range Model Number Trane Part w/Check Valve Trane Part R-410A Sporlan 1 1/2 - 2 1/2 RCZE-2.0-ZGA VAL08085 RCZE-2.0-ZGA VAL08085 R-410A Sporlan VAL09476 RCZE-3.0-ZGA VAL08086 ERZE-2-ZGA R-410A Sporlan ERZE-3-ZGA VAL09477 RCZE-4.0-ZGA...
  • Page 27 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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