Allied Air 39m83 Control Transformer 120V 24V 40VA

Product Description

The ALLIED AIR 39m83 is a step-down control transformer designed for HVAC system low-voltage control circuits. It converts a 120 volt primary supply to a 24 volt secondary output at a 40 VA power rating, operating at 60 Hz. This transformer provides the low-voltage power needed to drive thermostats, control boards, relay coils, and other 24-volt control components in forced-air heating and cooling systems. Installation is typically performed by a licensed HVAC technician as part of system commissioning, control circuit repair, or equipment replacement.

This transformer is suited for residential and light commercial HVAC applications where a reliable 24-volt control circuit is required. It fits into standard furnace, air handler, and rooftop unit control compartments that call for a 40 VA rated transformer operating on a 120 volt single-phase power supply. Technicians replacing failed or undersized transformers in existing control circuits will find this unit a direct-fit solution.

Key Features

• 120 volt primary to 24 volt secondary step-down conversion
• 40 VA power rating supports standard HVAC control circuit loads
• 60 Hz operating frequency matches standard North American electrical supply
• Designed for low-voltage thermostat and control board circuits

Compatibility

Designed as an OEM-style replacement transformer for residential and light commercial HVAC control circuits requiring a 120 volt primary, 24 volt secondary, 40 VA transformer.

Installation Notes

A licensed HVAC technician should perform this installation. Disconnect and lock out all power to the unit before removing the existing transformer or making any wiring connections. Follow NEC guidelines for low-voltage control wiring. Verify the VA rating meets or exceeds the total connected control circuit load before energizing the system.

Technical Specifications

• Primary Voltage: 120 volts
• Secondary Voltage: 24 volts
• Power Rating: 40 VA
• Frequency: 60 Hz

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 39m83