632691R Nordyne PTCR Motor Starter 

Description

The 632691R is an OEM PTC motor starting resistor (PTCR relay) engineered to provide reliable startup current for PSC blower and condenser fan motors in Nordyne HVAC and PTAC equipment. It incorporates a positive temperature coefficient ceramic element (designation MZ92D-40RN) that offers low resistance during motor spin-up, then heats up to sharply increase resistance and remove the start winding once full speed is reached. Housed in a heat-resistant enclosure with a two-pin polarized connector, it supports 208–230 VAC, 50/60 Hz systems and delivers consistent performance under load.

Key Features

• Factory-new OEM Nordyne part

• PTCR element type: MZ92D-40RN

• Operating voltage: 208–230 VAC, 50/60 Hz

• Two-pin polarized connector for plug-and-play replacement

• Rated continuous current: 3 A; startup current: 12–15 A

• Durable, heat-resistant ABS housing

Compatibility

Replaces the following Nordyne PTCR starters and connector styles:

Commonly found in:

• Residential PTAC models (e.g., 4EAT-08K-M4, 4EAT-12K-M7)

• Rooftop and packaged heat pump units using PSC motors

• Any Nordyne single-phase motor application requiring an MZ92D-40RN PTCR starter

Installation and Service Tips

• Confirm the motor’s voltage rating (208–230 VAC) matches the PTCR starter before installation.

• Inspect connector pins for corrosion; clean contacts to ensure a solid electrical connection.

• When upgrading from a 3-pin to a 2-pin unit, reference the OEM wiring diagram and use an adapter harness if necessary.

• Replace immediately if the housing is cracked or if the motor exhibits slow starts, humming, or fail-to-start symptoms.

Cross-Reference & Resources

• OEM Nordyne replacements: 632464 → 632691R, 632464R → 632691R, 632691 → 632691R