Decoding the D75P2G Nameplate and Full Load Amps (FLA)

The D75P2G is a 3/4 HP (0.55 kW mechanical output), 208/230V, 1-Phase Permanent Split Capacitor (PSC) AC induction motor, predominantly used in HVAC condenser fans, industrial blowers, and constant-torque ventilation. If you are looking for the D75P2G motor full load amps, the direct answer is 4.8 Amps at 230V (and approximately 5.4 Amps at 208V).

Full Load Amps (FLA) is the current the motor draws when delivering its rated 3/4 HP mechanical output at rated voltage and frequency. It is the foundational number for sizing your branch circuit conductors and overload protection. Do not confuse FLA with Locked Rotor Amps (LRA). The D75P2G has an LRA of roughly 28 Amps—the momentary inrush current when the rotor is stationary. Your breaker must tolerate this 28A spike for the few milliseconds it takes the motor to spin up without nuisance-tripping.

D75P2G PSC Motor Nameplate Specifications
Parameter Value Application Context
Horsepower / kW 3/4 HP / 0.55 kW Mechanical output at the shaft; dictates physical load capacity.
Voltage 208-230V AC Single-phase; nominal 240V systems typically measure 230V at the lugs.
Full Load Amps (FLA) 4.8A (230V) / 5.4A (208V) Basis for NEC Article 430 wire ampacity and breaker sizing.
Locked Rotor Amps (LRA) ~28.0A Inrush current; dictates breaker magnetic trip threshold.
RPM / Poles 1075 RPM / 6-Pole Standard speed for direct-drive 22-inch condenser fan blades.
Run Capacitor 7.5 µF / 370V AC Required for auxiliary winding phase shift; not always included in box.

Motor Type Comparison: Where the PSC D75P2G Fits

To understand if the D75P2G is the right tool for your load profile, you have to look at the motor topology. The PSC (Permanent Split Capacitor) design keeps the auxiliary winding and run capacitor energized 100% of the time. There is no centrifugal start switch to fail, making it highly reliable for continuous duty, but it sacrifices starting torque and peak efficiency compared to modern alternatives.

AC Motor Topologies for 3/4 HP Blower and Fan Loads
Motor Type Torque Curve Profile Control Needs Relative Cost (2026)
PSC (D75P2G) Low starting torque, smooth running torque. Best for fans/pumps where load increases with speed. Simple contactor/relay. Requires external run capacitor. Cannot use standard VFDs. $80 - $130 (Lowest upfront)
ECM (Electronically Commutated) Programmable torque. Can maintain constant airflow regardless of static pressure changes. Requires proprietary OEM control board or specific 24V DC/AC signaling module. $350 - $600 (Highest upfront, lowest operating)
Shaded Pole Very low starting and running torque. Extremely high slip. Direct on-line (DOL) switch or simple triac for basic speed control. $40 - $70 (Cheapest, but poor efficiency)
Bench Note: Never swap a PSC motor for a Shaded Pole motor on a high-static-pressure blower. The shaded pole will stall and burn out its windings under load. Conversely, if you are replacing an ECM with a D75P2G PSC, you must rewire the control board to supply raw 230V line voltage, as the ECM's low-voltage communication harness will not drive a PSC contactor.

Wiring, Terminals, and Sizing the Circuit

Properly wiring the D75P2G requires identifying the PSC terminal layout and applying NEC Article 430 rules for motor circuits. Unlike standard resistive loads, motor circuits have specific multiplier rules for both wire ampacity and overcurrent protection.

Terminal Identification (Standard 3-Wire PSC)

  • Black (T1 / Line): Connects to L1 (Hot) via the contactor.
  • White (T2 / Common): Connects to L2 (Neutral/Hot) via the contactor. In 240V systems, both L1 and L2 are ungrounded conductors.
  • Brown (T3 / Capacitor): Connects exclusively to one terminal of the 7.5µF run capacitor. The other capacitor terminal ties back to the White (Common) wire.
  • Green (Ground): Equipment grounding conductor (EGC). Must be bonded to the motor casing and the panel ground bar.

Sizing Rule of Thumb and Worked Load Example

Let's size the branch circuit for our 4.8A FLA motor using NEC-style guidance (always verify with your local AHJ).

  1. Conductor Sizing (NEC 430.22): Wires must be sized for 125% of the motor FLA.
    Calculation: 4.8A × 1.25 = 6.0 Amps minimum ampacity.
    Selection: 14 AWG THHN (rated 20A at 75°C) or 14 AWG NM-B (rated 15A at 60°C) both easily exceed 6.0A. We will use 14 AWG.
  2. Overcurrent Protection (NEC 430.52): An inverse-time breaker for a single-phase motor can be sized up to 250% of FLA to allow for LRA inrush.
    Calculation: 4.8A × 2.50 = 12.0 Amps.
    Selection: The next standard breaker size up per NEC 240.4(B) is 15 Amps.
  3. Motor Overload Protection: The D75P2G features an internal, automatically resetting bimetallic thermal overload embedded in the stator windings. No external overload relay block is required for this specific fractional-HP model.

Driver and Controller Demands

A common mistake on the workbench is attempting to drive a PSC motor like the D75P2G with a standard Variable Frequency Drive (VFD). Do not use a standard VFD on a single-phase PSC motor. VFDs output high-frequency PWM square waves that will rapidly degrade the run capacitor's dielectric and induce severe voltage spikes that puncture the auxiliary winding insulation.

The D75P2G demands a simple, robust switching mechanism. For industrial or HVAC applications, the correct driver is a Definite Purpose (DP) Contactor. A 30A, 2-pole, 24V-coil DP contactor (such as the Packard C230B or Eaton C25 series) is the industry standard. The 30A rating easily handles the 28A LRA inrush without contact pitting, and the heavy-duty silver-cadmium oxide contacts resist welding under continuous 4.8A FLA loads.

Furthermore, the motor demands a properly rated run capacitor. If the OEM does not include one, you must source a 7.5 µF, 370V AC (or 440V AC) oval or round run capacitor. Using a "start capacitor" (which has a much higher microfarad rating and is designed for momentary duty) will result in an explosive capacitor failure within seconds of energization.

Failure Signatures: Hum, Overheat, and Stall

When a D75P2G fails, it rarely just stops working without a symptom. Diagnosing the failure signature saves you from replacing a perfectly good motor when the fault lies in the support circuit.

PSC Motor Troubleshooting Matrix
Symptom Measurement / Observation Root Cause & Fix
Hum + No Rotation Motor draws 15-20A (near LRA) but shaft won't spin. Pushing shaft with a non-conductive stick causes it to run. Bad Run Capacitor. The capacitor has lost its µF rating (dielectric dry-out). Test with a multimeter's capacitance setting; if it reads below 6.5 µF, replace it.
Overheat + Cycles Off Motor casing is >100°C. Runs for 15 minutes, clicks off, then restarts 20 minutes later. Thermal Overload Trip. Caused by restricted airflow (dirty condenser coil), low supply voltage (<200V), or failing bearings increasing mechanical drag. Clean coils and check line voltage.
Dead Stall (No Hum) Zero current draw. 230V is confirmed present at the Black and White terminals at the motor peckerhead. Open Internal Overload or Winding. The internal thermal fuse has permanently failed open, or the main winding wire has snapped. Motor must be replaced.

Decision Tree: Is the D75P2G the Right Pick for Your Load?

Selecting the right motor comes down to matching the load profile, power availability, and control requirements. Use this decision path to finalize your bill of materials.

  • IF your load requires variable speed control via 0-10V DC signaling or requires constant airflow compensation against changing static pressure...
    THEN the D75P2G is the wrong choice. You need an ECM (Electronically Commutated Motor) and its paired OEM control module.
  • IF your load is a high-inertia, hard-starting application like a compressor or a heavily loaded conveyor...
    THEN the PSC topology lacks the starting torque. You need a Capacitor-Start/Capacitor-Run (CSCR) motor with a centrifugal switch and a potential relay.
  • IF your load is a standard constant-torque fan, blower, or pump, running continuously on single-phase 208/230V power, and you prioritize low upfront cost and simple contactor-based reliability...
    THEN the D75P2G PSC motor is the exact correct topology.
Final Default Recommendation: For a standard 3/4 HP HVAC condenser or industrial ventilation fan operating on 230V single-phase, procure the D75P2G PSC Motor, pair it with a 7.5µF / 370V AC run capacitor, and switch it using a 30A 2-Pole Definite Purpose Contactor fed by a 15A double-pole breaker on 14 AWG conductors. This specific combination meets NEMA MG-1 performance standards, satisfies NEC ampacity requirements, and provides the highest mean-time-between-failures (MTBF) for the lowest total installed cost.