OEM Replacement Power Supply PCB | 24VDC | Detex AO19 & 90-800 Applications

Restore a compatible Detex automatic-door or electrified-door power supply with the Detex 104252 Printed Circuit Board, commonly identified as the red replacement PCB/PWA.

The 104252 is the factory replacement circuit board used in the Detex 90-800 Filtered Regulated Power Supply, which provides regulated 24VDC power for compatible Detex door-hardware systems. The 104252 is also cataloged by Detex distributors as a replacement PCB for AO19 automatic door operator power-supply applications.

Key Features

• Genuine Detex replacement circuit board

• Part Number 104252

• Printed Circuit Board / PWA

• Commonly identified as the red PCB

• Factory replacement board for the Detex 90-800

• Used with compatible AO19 automatic door operator power-supply systems

• Regulated 24VDC output

• Filtered DC power

• Fire-loop input circuitry

• Adjustable DC output

• Onboard status LEDs

• Electronic overload protection

• Replacement board only

• Transformer and enclosure sold separately unless specifically stated

Important Product Identification

The Detex 104252 is a power-supply circuit board.

It should not be confused with the separate:

AO19 Operator Controller / UDC 1000 Controller

Detex lists the AO19 operator controller separately in its automatic-operator documentation.

If the automatic door has a movement, programming, or operator-control problem, verify whether the issue is actually with the operator controller before replacing the 104252.

Detex 90-800 Replacement Board

Detex factory documentation specifically lists:

Replacement Circuit Board: PWA 104252

for the 90-800 Filtered Regulated Power Supply.

The 90-800 provides:

24VDC regulated and filtered output

for compatible electrified door-hardware equipment.

24VDC Power Supply Function

Within the compatible Detex power-supply assembly, the 104252 converts and regulates incoming transformer power into the DC power required by connected door-hardware equipment.

The board includes connections for:

• Transformer input

• 24VDC output

• Fire-loop monitoring

• Connected door-hardware loads

The complete 90-800 uses a Detex 104254 transformer in conjunction with the 104252 board.

Fire Loop Input

The 104252 incorporates a fire-loop input that allows the compatible power-supply system to interface with an appropriate fire-control circuit.

Detex provides selectable sensing for:

• 12V fire-loop systems

• 24V fire-loop systems

The fire-control wiring must be configured appropriately for the complete door system and applicable life-safety requirements.

Onboard Status Indicators

The circuit board includes LED indicators that assist technicians with troubleshooting.

Factory documentation identifies indicators for:

• Power Input Good

• Fire Loop OK

• Power Output Good

These indicators can help determine whether the board is receiving power and whether the output and fire-loop circuits are operating correctly.

Electronic Overload Protection

The 104252 incorporates protection for the DC output.

If a connected load or wiring develops a short circuit, the output can shut down to protect the power-supply circuitry.

Detex instructs technicians to correct the short or overload condition before reconnecting the load.

AO19 Application

Current commercial distributors catalog Detex 104252 as:

PCB Board, For AO19 Operator

or:

Printed Circuit Board for AO19 Power Supply.

For catalog accuracy, the 104252 should be considered a power-supply PCB used in compatible AO19 installations, rather than the electronic controller that directly programs and controls operator movement.

Product Specifications

Manufacturer: Detex
Part Number: 104252
Product Type: Printed Circuit Board / PWA
Common Identification: Red PCB
Primary Factory Application: Detex 90-800 Power Supply
AO19 Application: Compatible Power-Supply Replacement PCB
System Output: 24VDC
Power Type: Filtered / Regulated
Fire Loop: 12V / 24V Selectable
Status Indicators: Power Input, Fire Loop, Power Output
Compatible Transformer: Detex 104254 in 90-800 assembly
Installation: Inside Compatible Detex Power-Supply Enclosure
Use: Replacement / Repair / Service

Common Applications

Used in compatible systems serving:

• Detex AO19 automatic door operators

• Electrified exit devices

• Electric latch-retraction systems

• Commercial automatic doors

• Access-control doors

• Healthcare entrances

• Schools

• Government facilities

• Institutional buildings

• Commercial facilities

Replacement Applications

Replace the 104252 when the existing PCB has been properly diagnosed with issues such as:

• No 24VDC output

• Failed power-output circuitry

• Fire-loop circuit failure

• Visible PCB damage

• Failed electronic components

• Intermittent power output

Always test the transformer, wiring, connected load, and downstream hardware before replacing the board.

A shorted device or wiring fault can cause the board's output protection to activate even when the PCB itself is functioning correctly.

Important Compatibility Note

Before ordering, verify the existing board is marked:

DETEX P/N 104252

Also confirm:

• Existing power-supply model

• AO19 system configuration

• Transformer condition

• Input voltage

• Connected hardware

• Fire-loop configuration

• Existing board revision

Detex has used later board revisions in newer controller and power-supply assemblies, including 104252-3, so matching the complete part number and system configuration is important before substitution.

Installation & Safety

Installation should be performed by qualified personnel familiar with commercial automatic-door and low-voltage access-control systems.

Always:

• Disconnect incoming power before servicing

• Verify transformer output

• Correct short circuits before installing a replacement board

• Maintain separation of high- and low-voltage wiring

• Confirm fire-control connections

• Follow applicable electrical and life-safety requirements

Detex specifically warns that the enclosure should not be opened or serviced while energized.

What's Included

(1) Detex 104252 Printed Circuit Board / PWA