Rotom Round Run Capacitor 36-15R3744, 15 MFD, 370/440V

The Rotom 36-15R3744 Run Capacitor is designed to provide the phase shift and continuous electrical support required by a compatible PSC or capacitor-run motor while it operates. It replaces TRCF15, PRCF15A, CR15X440R, LCR15X440R, 12734, SFCAP15440R when capacitance, voltage, shape, and physical fit are confirmed.

Is This the Right Part?

Confirm the capacitance (15 MFD), voltage rating, shape, diameter, can height, mounting clamp, and terminal clearance before ordering. Match the original capacitance exactly — a larger or smaller MFD value can increase current consumption and overheat the motor windings.

Common Symptoms of a Weak or Failed Run Capacitor

• Motor hums but does not start
• Slow or difficult startup
• Motor overheating or shutting down on thermal protection
• Reduced fan or blower speed
• Intermittent operation or higher current draw

Check Before Replacing

• Test the existing capacitor with a capacitance meter — confirm it is weak, open, or shorted
• Inspect motor bearings for seizure
• Verify supply voltage is correct and within range
• Check wiring, relay, and contactor for damage or failure
• Inspect fan blade or blower wheel for obstruction

Part Details

Installation Notes

1. Disconnect power and have the capacitor safely discharged before handling.
2. Photograph wiring and terminal connections before removal.
3. Compare the new capacitor with the original — confirm diameter, height, and terminal arrangement.
4. Confirm mounting-clamp diameter, cabinet clearance, and wire reach.
5. Test the appliance after installation and check for unusual sounds or error codes.

Use a qualified technician when diagnosis or installation is outside your experience. Capacitors store a charge and must be safely discharged before handling.

Verified Round Electrical Equivalents

• TRCF15 — Titan Pro, 15 MFD, 440/370V, round
• PRCF15A — Titan HD / Packard, 15 MFD, 440/370V, round
• CR15X440R — Supco, 15 MFD, 440V, round
• LCR15X440R — Supco, 15 MFD, 440V, round
• 12734 — JARD / MARS, 15 MFD, 440/370V, round
• SFCAP15440R — Service First / Trane reference, 15 MFD, 440V, round

Electrically Equivalent — Oval Housing (Mounting Review Required)

• 36-15-370440 — Rotom oval, 15 MFD, 370/440V
• CR15X440 — Supco oval, 15 MFD, 440V
• TOCF15 — Packard/Titan Pro oval, 15 MFD, 440V
• TP15440 — TradePro oval, 15 MFD, 440V

Oval equivalents match the required capacitance and voltage but use a different housing shape. Do not use as a direct physical replacement unless the equipment accepts an oval capacitor or the mounting bracket is changed.

Fitment Note

36-15R3744 is a specification-based HVAC motor-run capacitor — not model-specific. Compatibility is confirmed by matching: capacitor type (single run), capacitance (15 MFD), voltage (370/440 VAC), shape (round), diameter (1.65 in), can height (3.15 in). A 440V-rated capacitor may replace a 370V capacitor when capacitance, type, terminals, and physical fit match. A 370V-only capacitor must not replace a capacitor required to operate at 440V.

Fitment reminder: Match the complete original capacitor specifications before ordering. May restore proper motor operation when testing confirms the original 15 MFD run capacitor is weak, open, or shorted.