Nordyne Intertherm 620825 Furnace Transformer 20VA 115V 24V

Product Description

The NORDYNE INTERTHERM 620825 is a step-down control transformer designed for use in gas furnace control circuits. It converts 115-volt primary power to a 24-volt secondary output at 20 volt-amperes (VA), providing the low-voltage power required to operate thermostats, control boards, and other 24-volt components in a forced-air heating system. This transformer is a direct OEM-style replacement part intended for installation by licensed HVAC technicians servicing Nordyne and Intertherm brand furnace equipment. The 20 VA capacity is sized to handle standard residential low-voltage control loads without overheating under normal operating conditions.

This transformer is suited for residential forced-air gas furnace applications where a reliable 24-volt control circuit is required. It is a replacement for legacy part number 104379000 as noted in supplier sourcing data. Installation is typical in the control section of the furnace cabinet, where low-voltage wiring connects the transformer secondary to the thermostat circuit and control board. Current replacement cross-reference 620825R supersedes this part number.

Key Features

• 115-volt primary to 24-volt secondary step-down design for standard residential furnace control circuits
• 20 VA output capacity handles typical low-voltage thermostat and control board loads
• OEM replacement part — supersedes legacy part number 104379000
• Matched to Nordyne and Intertherm furnace platform specifications

Compatibility

Identified as a replacement for legacy Nordyne part number 104379000. Current OEM cross-reference is 620825R. Designed as an OEM-style replacement transformer for Nordyne and Intertherm residential gas furnaces requiring a 115-volt primary, 24-volt secondary, 20 VA control transformer.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all power to the furnace at the disconnect switch or breaker before removing or installing any transformer. Verify primary voltage at the furnace matches the transformer rating before energizing. Low-voltage wiring connections should comply with NEC Class 2 circuit requirements.

Technical Specifications

• Primary Voltage: 115 volts
• Secondary Voltage: 24 volts
• Output Capacity: 20 VA

Standard Information

• Brand: NORDYNE INTERTHERM
• Manufacturer Part Number: 620825