Trane Air Heating and Cooling Coils

Introduction

Trane manufactures a diverse range of heating and cooling coils, including water coils, steam coils, and refrigerant coils. These coils are designed to meet various application needs, from comfort cooling to commercial and industrial processes. Coil capacities, pressure drops, and selection procedures are certified in accordance with AHRI Standard 410. Trane coils are available in six distinct fin configurations: 3/8-inch tube Omega-Flo™ H, 1/2-inch tube Delta-Flo™ E, 1/2-inch tube Delta-Flo™ H, 5/8-inch tube Prima-Flo™ E, 5/8-inch tube Prima-Flo™ H, and 1-inch tube Sigma-Flo™.

The H fins provide increased capacities and higher moisture carryover limits compared to E fins. Infinitely variable fin spacing (IVS) is offered on all coil fin surfaces, allowing for precise matching of heating and cooling loads to specific application requirements, surpassing traditional fixed fin spacings.

AHRI 410 Certified

The AHRI certification emblem signifies that a product performs as claimed by the manufacturer. To obtain an AHRI certification label, manufacturers must submit representative samples of their product line annually for independent testing. Only products that meet the claimed performance standards are listed by AHRI. Specifying AHRI-certified coils helps differentiate manufacturers committed to performance verification from those who merely claim compliance with AHRI 410 standards. Trane air heating and air cooling coils are AHRI ACHC-certified, with exceptions noted in the catalog.

CRN

The Canadian Registration Number (CRN) is granted to companies that comply with Canada's Technical Safety Standards Act concerning pressure vessel safety. In Trane air-handling systems, CRN applies to coils classified as Category H fittings. Many government and industrial clients require HVAC suppliers to possess a CRN. Trane has obtained a CRN for all steam and water coils used in Performance air handlers.

Copyright and Trademarks

This document and its contents are the property of Trane. Reproduction in whole or in part without written permission is prohibited. Trane reserves the right to revise this publication and make content changes without prior notification. All trademarks mentioned are the property of their respective owners. Trane, CompleteCoat, Delta-Flo, Omega-Flo, Prima-Flo, Sigma-Flo, and TOPSS are registered trademarks of Trane in the United States and other countries.

Revision History

Added R-454B refrigerant information.

Coil Applications

Water (Hydronic) Coils

The following table details various water coil types, their features, dimensions, and operating conditions:

Notes:

• Heating coils can be offered in higher row numbers as a special.
• 3F coils are not certified by AHRI with R-22, R-134a, R-404A, R-407C, R-454B, R-507A refrigerants.
• UF and FD coils produced since 2001 are UL-listed for use with R-410A and R-454B refrigerant. UF and FD coils produced prior to 2001 are not UL-listed for R-410A and R-454B refrigerant. UF and FD coils are not certified by AHRI with R-22, R-134a, R-404A, R-407C, R-454B, R-507A refrigerants.
• All coils are fully tubed except for WA, UA, and A coils which have alternate tube construction (half of fin holes have tubes, half of fin holes are empty).
• H, H4, and F coils are not certified by AHRI.

Steam Coil Control Applications

The following table outlines steam coil control applications, including tube diameter, control types, and refrigerant compatibility:

Notes:

• s = Special selection.
• H, H4, and F coils are not certified by AHRI.
• UF and FD coils produced since 2001 are UL-listed for use with R-410A and R-454B refrigerant. UF and FD coils produced prior to 2001 are not UL-listed for R-410A and R-454B refrigerant. UF and FD coils are not certified by AHRI with R-22, R-134a, R-404A, R-407C, R-454B, R-507A refrigerants.
• 3F coils are not certified by AHRI with R-22, R-134a, R-404A, R-407C, R-454B, R-507A refrigerants.

Heating and Cooling Water Coils

Detailed specifications for heating and cooling water coils, including features, dimensions, materials, and operating conditions:

Steam Coils

Specifications for steam coils, including features, dimensions, materials, and operating conditions:

Refrigerant Coils

Specifications for refrigerant coils, including features, dimensions, materials, and refrigerant compatibility:

Notes:

• Tube side. Pressure or temperature limits may be different under CRN for some coils. Please contact your sales representative.
• Coil is dedicated for use in Performance (CSSA), M-Series (MCCB), Modular (MCCA), and T-Series (TSCB) Climate Changer air handlers only. Refer to product catalogs for fin information.
• Type H, H4, and F coils are not certified by AHRI.
• UF and FD coils produced since 2001 are UL-listed for use with R-410A and R-454B refrigerant. UF and FD coils produced prior to 2001 are not UL-listed for R-410A and R-454B refrigerant. UF and FD coils are not certified by AHRI with R-22, R-134a, R-404A, R-407C, R-454B, R-507A refrigerants.
• 3F coils are not certified by AHRI with R-22, R-134a, R-404A, R-407C, R-454B, R-507A refrigerants.
• All coils are fully tubed except for WA, UA, and A coils which have alternate tube construction (half of fin holes have tubes, half of fin holes are empty).

Replacement and Special Coils

This section provides details on replacement and special coil options:

Notes: Refer to COIL-EB-29 for more information. Type OW, OD, OK, WC, XW, NN(NSN), and 5A coils are not certified by AHRI.

Common Design Specials

• Victaulic connections available to replace steel, plug connections.
• Red brass connections available to replace steel, plug connections.
• Heat pump coils.
• Two-row or 8-row FD refrigerant coils.
• FD refrigerant coils with 12-inch or 54-inch finned width.
• Special circuited refrigerant coils: Modifications made to the coil circuiting to match uneven capacity circuits, four distributors.
• Special coil connections lengths.
• Special coil connections locations.
• Special refrigerant applications.
• DX selections with different refrigerants.
• Centrifugal fans air-cooled condenser selection.

Note: Design specials are not AHRI-certified.

Moisture Carryover Limits

The following charts provide guidelines for determining face velocity limits on Trane cooling coils to minimize water carryover. Applications with minimal latent load may allow for higher face velocities. The Trane TOPSS selection program validates water carryover limits based on actual conditions.

Figure 1. Moisture carryover face velocity limitations

[Graph showing moisture carryover face velocity limitations for different fin series: Delta-Flo E, Delta-Flo H, Prima-Flo E, Prima-Flo H, Omega-Flo H]

Figure 2. Moisture carryover face velocity limitations with CompleteCoat™ coating

[Graph showing moisture carryover face velocity limitations with baked phenolic coating for different fin series: Prima-Flo E, Delta-Flo E, Sigma-Flo Cu, Delta-Flo H, Prima-Flo H]

Coil Performance

Table 1. Effects of construction, CFM, and GPM on coil performance

This table illustrates how changes in construction, CFM, and GPM affect coil performance, assuming other parameters remain constant:

Water Formulas

5/8-inch (0.020) tube water velocity (in feet per second) = (1.07 x GPM)/number of tubes fed.

1/2-inch (0.016) tube water velocity (in feet per second) = (1.68 x GPM)/number of tubes fed.

Steam Formulas

BTUH = 1.08 x CFM x (Leaving Air Temperature - Entering Air Temperature).

(1.08 = 0.240 x 60 x 0.075).

0.240 = Specific heat of air at 70°F.

60 = Minutes/Hour.

0.075 = Density of standard air in Lbs/Ft³.

Temperature rise = BTUH/(1.08 x CFM).

Pounds of Condensate/Hour = BTUH/Latent Heat of Steam.

Table 2. Properties of steam

Table 3. Coil equations and parameters

Definitions and Letter Symbols:

• A: area (ft²)
• Btu: British thermal units
• Cp: specific heat (Btu/lb°F)
• gpm: gallons per minute
• h: enthalpy (Btu/lb)
• m: mass flow rate (lb/h)
• q: rate of heat transfer (Btu/h)
• scfm: standard cubic feet per minute
• t: temperature (°F)
• U: overall heat transfer coefficient (Btu/h·ft²°F)
• V: velocity (ft/min)
• ρ: density (lb/ft³)
• Δ: difference between values
• Subscripts: a = air, i = entering, o = leaving, w = water

Fundamental Equations:

• q = mwc p w (tw,i - tw,o)
• q = m a c p,a (ta,o - ta,i)
• q' = UA (LMTD)
• q = UA (Δt avg)

Air-Side (Sensible coil): q = 1.08 (scfm)(Δta)

Water-Side: q = 500 (gpm)(Δtw)

Air-Side (Total): q = 4.5 (scfm)(Δh)

Coil Fin Design

Delta-Flo™ Fin

Trane 1/2-inch coils feature a staggered tube pattern and the unique Delta-Flo™ fin design. These fins allow for low airside pressure drop and high capacity for lower gpm applications. Delta-Flo™ H fins offer increased capacity and higher moisture carryover limits compared to Delta-Flo™ E fins. Both Delta-Flo™ fins are available in 0.0055-inch thick aluminum. The staggered tubes and unique fin configuration make Trane half-inch coils highly efficient.

Prima-Flo™ Fin

These 5/8-inch coils have a parallel tube pattern with two fin design options: Prima-Flo™ E and Prima-Flo™ H. Prima-Flo™ E is ideal for systems where airside pressure drop is a concern, leading to lower fan brake horsepower and energy savings. Prima-Flo™ H is suitable for systems where moisture carryover is a concern, offering increased capacity and higher moisture carryover limits with minimal impact on air pressure drop compared to Prima-Flo™ E. Both Prima-Flo™ E and Prima-Flo™ H are available in aluminum and copper fins.

Sigma-Flo™ Fin

The Sigma-Flo™ coil features a 1-inch parallel tube pattern designed to maximize heat transfer while minimizing coil size. The 1-inch Sigma-Flo™ tube pattern is available for steam coils with aluminum or copper fins.

Omega-Flo™ Fin

Trane 3/8-inch coils utilize a staggered tube pattern and the highly efficient Omega-Flo™ H design. These fins provide an enhanced design that allows coils to meet customer requirements with a smaller footprint. Omega-Flo™ H fins are available in 0.0075-inch thick aluminum, offering longer life and a more robust fin and tube pack.

Infinitely Variable Fin Spacing

Infinite Variable Fin Spacing (IVS) provides designers with flexibility to select the optimal coil for specific applications. IVS fins are available for most coils, allowing selections to be tailored to application needs. This flexibility enables more precise matching of heating and cooling loads compared to traditional fixed fin spacings. For example, a cooling coil with Delta-Flo™ E fins can be specified with fin spacings ranging from 72 to 168 fins per foot. IVS can reduce the number of fins needed, leading to lower airside pressure drops and fan brake horsepower, resulting in energy savings.

Internally Enhanced Tubes

Trane offers high-performance, internally enhanced tubes for DX cooling coils, suitable for Performance Climate Changer air handlers or standalone applications. This option is standard on 3F DX coils and available for all UF and FD direct-expansion (DX) coils. Internally-enhanced tubes improve coil performance by reducing fin density and the number of rows, which lowers copper usage and provides a better cost position without compromising performance. Benefits include lower air pressure drop, reduced operating costs, and contribution to LEED requirements. Ease of maintenance is improved due to fewer fins and rows, facilitating cleaning and extending coil life. Reduced moisture carryover risk is another benefit, as lower fin density minimizes carryover that could damage other air handler components. Figure 4 illustrates the benefits of internally enhanced tubes versus smooth tubes, showing potential annual operating cost and air pressure drop savings.

Figure 4. Benefits of internally enhanced tubes vs. smooth tubes

[Bar chart comparing annual operating cost, coil air pressure drop, and coil cost for current smooth tubes, new internally enhanced tubes (6 rows, 79 FPF), and new internally enhanced tubes (4 rows, 146 FPF).]

Turbulators

Trane bronze spring turbulators are available for maximum water-side heat transfer, particularly for applications with large water temperature drops (Earthwise™) and low Reynolds Number (cold aqueous glycol solutions). Trane spring turbulators do not impede tube drainage.

CompleteCoat™ Coil Coating

Trane coils are available with the CompleteCoat™ coating option, a tough epoxy coating that uniformly covers all heating and cooling coil surfaces, including fin edges, coils, and headers, with a 0.8 to 1.2 mil layer. This advanced material is flexible, preventing thermal cracking issues associated with phenolics, and avoids bridging problems found in older, more viscous coatings. CompleteCoat™ coils are not AHRI-certified.

The CompleteCoat coating provides resistance to a wide range of environmental and industrial contaminants, as demonstrated by its performance in over 1,000-hour salt spray exposure tests. The coating's uniform, thin layer results in a heat transfer capacity reduction of less than one percent. The protective system utilizes advanced coating material bonded to the entire coil via an electrochemical application method, ensuring uniform coating of all metal areas. The coating performs across a wide temperature range, from -50°F to +450°F. This option expands the application range of Trane coils to marine and industrial environments where other coatings may not suffice. CompleteCoat coating addresses concerns regarding thermal breakdown, performance degradation, and incomplete coverage. Consult a Trane sales engineer for more information on the CompleteCoat coil protective system for corrosion resistance against airborne contaminants.

Chemical Resistance Chart

Table 4. CompleteCoat™™ coatings are resistant to a wide range of environmental and industrial contaminants

Table 4. CompleteCoat™™ coatings are resistant to a wide range of environmental and industrial contaminants (continued)

Notes

The AHRI Certified mark indicates Trane U.S. Inc. participation in the AHRI Certification program. For verification of individual certified products, go to ahridirectory.org.

Trane - by Trane Technologies (NYSE: TT), a global climate innovator - creates comfortable, energy efficient indoor environments for commercial and residential applications. 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. Trane is committed to using environmentally conscious print practices.