Copeland CR53KQ-TFD-970 Reciprocating Compressor

Copeland Compressor CR53KQ-TFD-970 | 53,000 BTU/hr Hermetic Reciprocating Unit

The Copeland CR53KQ-TFD-970 (and Polyolester-charged counterpart CR53KQE-TFD-970) is a two-cylinder hermetic reciprocating compressor engineered for medium-to-high evaporating temperature commercial air conditioning, heat pump systems, and marine HVAC installations.

Built to withstand wide voltage variances and harsh environmental stress, this unit delivers a nominal cooling capacity of 53,000 BTU/hr at standard ARI rating conditions (45°F evaporating / 130°F condensing). Its robust cast-iron internal running gear and optimized valve reed assembly provide high volumetric efficiency, reliable continuous duty, and sustained mechanical integrity in stationary power plants, offshore platforms, and shipboard chiller loops.

Model Details:

• Manufacturer / Brand: Copeland (Emerson Climate Technologies)
• Model Number: CR53KQ-TFD-970
• Manufacturer Part Number (MPN): CR53KQ-TFD-970 / CR53KQE-TFD-970

Technical Specifications:

Key Features

1. Dual-Refrigerant Mechanical Design: Engineered natively for R-22 utilizing Copeland mineral oil (Sontex 200LT / Suniso 3GS), and fully field-convertible to R-407C retrofit blends when serviced with Polyolester (POE) lubricant.
2. 460V/380V Dual-Frequency Operation: Factory wound for 460V / 3-Phase / 60 Hz and 380–420V / 3-Phase / 50 Hz, perfectly suited for standard 440V–480V vessel auxiliary switchboards and global commercial industrial grids.
3. Integral In-Winding Thermal Protection: Features embedded line-break internal motor protection (TFD motor code) that prevents winding failure against high-temperature stalls, phase loss, or persistent locked-rotor currents.
4. High-Efficiency Dual-Cylinder Mechanics: Displacing 5.47 cu.in/rev (551.10 cu.ft/hr at 3500 RPM), the dual-piston architecture dampens cyclic pulse amplitude and minimizes vibration transfer across structural piping.
5. Compact Footprint for Tight Retrofits: Features standardized 7.50-inch × 7.50-inch base mounting dimensions with 7/8-inch ODF suction and 1/2-inch ODF discharge braze connections for direct drop-in replacement.

Terminal Allocations & Wiring Schematics

• Terminal Identification: Three standard spade/screw-down threaded lugs labeled T1 (Phase A / L1), T2 (Phase B / L2), and T3 (Phase C / L3).
• Phase Rotation: Because this is a reciprocating mechanism, compression occurs symmetrically regardless of motor rotation. However, proper phase rotation should be maintained to align with system blower/fan sequencing.
• Internal Overload: Embedded line-break thermal sensor wired in series with the common star point, de-energizing all three phases concurrently if case core temperature or current thresholds exceed design safety limits.
• Grounding: External bonding lug attached directly to the compressor body inside the terminal enclosure for connection to vessel or chassis safety ground (PE).

Direct Equipment Compatibility

• Carrier / Carlyle Commercial Condensers: 38CK, 38BR, 09DA series
• Trane Commercial Systems: TTA048, TWA048 units
• York / Johnson Controls: H2CE048, D2CG048 condensing systems
• Marine Package Units: Dometic / Cruisair / Marine Air Systems shipboard air handlers and central direct-expansion (DX) deck chillers

Part Number Cross-References

• Copeland Alternate BOM: CR53KQ-TFD-230, CR53KQ-TFD-250, CR53KQ-TFD-980
• POE Factory Charge Version: CR53KQE-TFD-970, CR53KQE-TFD-270
• Scroll Alternative / Drop-in Replacement: Copeland Scroll ZR54K3E-TFD-970 / ZR49K3E-TFD-970 (Note: When upgrading from CR reciprocating to ZR scroll, verify system accumulator sizing and line geometry)
• Carrier / Totaline Part Numbers: P021-5339, P031-5349, CR53KQETFD970
• Grainger Item Cross: 2E539, 4NE23

Frequently Asked Questions

Can I replace the Copeland CR53KQ-TFD with a Copeland Scroll Compressor?

Yes. The industry standard scroll upgrade is the Copeland ZR54K3E-TFD-970 or ZR49K3E-TFD-970. When switching to scroll, adjust the suction and discharge line copper routing to eliminate stress cracks, and inspect the suction accumulator capacity.

What is the difference between CR53KQ-TFD and CR53KQE-TFD?

The letter “E” in the model designation indicates that the compressor was factory filled with Polyolester (POE) oil for use with alternative hydrofluorocarbon (HFC) refrigerants such as R-407C. The standard model without the “E” ships with mineral oil formulated for legacy R-22 systems. Both share identical displacement, motor specs, and mounting footprints.

What is the purpose of the internal motor protector?

The “TFD” code designates a three-phase motor with an internal, line-break thermal protector. It automatically breaks connection to the internal center-point of the three motor windings if stator winding temperatures exceed design limits or if the compressor draws sustained locked rotor amperage (55A). It resets automatically once the internal core cools down.

What breaker and contactor size should be used for the CR53KQ-TFD-970?

The compressor MCC is 12.7A and the contactor RLA is 9.1A. Size your contactor for a minimum of 3-pole, 600V, 15A to 20A inductive rating. For circuit breaker and conductor sizing, multiply the MCC by 1.56 (or refer to NEC/IEC engine room code guidelines), yielding a standard branch circuit protector rating of 15A to 20A inverse-time circuit breaker.

What are the correct terminal torque specs for the electrical connections?

For the T-box screw terminals (CRM-P block), torque lectrical terminal screws to 20–25 in-lbs (2.3–2.8 Nm). Do not over-torque, as this will fracture the ceramic insulator block and compromise the hermetic seal around the copper through-pins.