BT5-47240 12V A/C Compressor – Seltec / Valeo TM21HX, Direct Mount

Description

Overview

The BT5-47240 TM21HX compressor is designed for 12V mobile air-conditioning systems where cooling capacity, durability, and correct fitment are critical. Its direct-mount design simplifies installation, while the universal O-ring pad head supports flexible hose routing across a wide range of chassis layouts.

Furthermore, this compressor is factory-charged with PAG46 oil, uses a splined shaft, and supports CW/CCW rotation, allowing compatibility with multiple belt-drive orientations commonly found in bus HVAC systems.

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Key Features

• 12-volt heavy-duty A/C compressor

• Seltec / Valeo TM21HX compressor platform

• Direct-mount configuration

• Dual-groove pulley for two 1/2″ belt systems

• 145 mm clutch diameter

• Horizontal universal O-ring pad fittings

• High-capacity 10-cylinder design

• Designed for continuous mobile HVAC operation

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Compressor Specifications

General

• Manufacturer: Seltec / Valeo

• Model: TM21HX

• Voltage: 12V

• Refrigerant Type: R134a

• Displacement: 13.1 cu.in.

• Number of Cylinders: 10

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Mounting & Drive

• Mounting Type: Direct mount

• Drive Type: Belt-driven

• Belt Type: Two 1/2″ belts

• Clutch Grooves: 2

• Clutch Diameter: 145 mm

• Shaft Type: Splined shaft

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Head & Fittings

• Head Type: TM21

• Fitting Port Position: Horizontal

• Fitting Style: Universal O-ring pad

• Replacement Head Assembly: NSS

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Oil Specifications

• Oil Type: PAG46

• Factory Oil Charge: 180 cc

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Electrical Specifications

• System Voltage: 12V

• Wire Type: 2-wire

• Rotation: CW / CCW

• Diode Protection: None

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Interchange / Cross-Reference Numbers

Primary References

• BTRAC: BT5-47240

• MEI: 5877

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OEM & Manufacturer Numbers

18-10123-02, 18-10123-09, 10057240, 10357240, 10357252, 103-57393, 435-57240, 488-47240, 85100527

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Seltec / Valeo References

47240, 5877, 103-57240, 103-56393

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Industry & Aftermarket Cross References

20-47240, 22-64097-000, 400-044, 512220, 512269

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Fleet & Supplier References

ABP N83 304339Q, PRIMATECH PTAC5877, RF999999710

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Red Dot & Related

4379-RD5129020P, RDHRD5129020P, RDT75R861522Q, 75R861522Q

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Additional References

QP21-1564

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Typical Applications

• Transit and coach buses

• School and shuttle buses

• High-capacity mobile HVAC systems

• OEM and aftermarket TM21HX compressor replacements