Description
Product Overview
Building automation systems rely on dependable relay switching to operate pumps, fans, valves, dampers, and other equipment. The Honeywell XFR824A is a six-channel relay output module designed for the Excel 800 Panel Bus system. Its defining feature is the inclusion of local manual override switches, allowing technicians to select automatic operation or manually command individual relay outputs during testing and service. The module is part of Honeywell’s pluggable I/O architecture, where the electronic module can be removed separately from its wired terminal socket.
Each output uses a changeover relay with normally open, normally closed, and common contacts. Honeywell’s Excel 800 system documentation specifies a total module load limit of 12 A for AC loads from 19 to 250 VAC, and 12 A resistive or 3 A inductive for DC loads from 1 to 24 VDC. Individual normally open contacts are rated up to 4 A for AC resistive or inductive loads, and 4 A resistive or 1 A inductive for DC loads. Normally closed contacts have lower ratings in several operating conditions. The minimum specified contact load is greater than 50 mW. These ratings must be applied according to load type and the applicable terminal configuration, not simply treated as a 4 A rating for every contact.
The XFR824A also provides output status LEDs, feedback indicating manual override status, and a configurable output safety position for communication failures. Depending on the application configuration, outputs can be set to remain in their current state, turn off, or turn on when communication is lost. The module uses the XS824-25 push-in terminal socket or XSU824-25 screw-terminal socket. Verify the socket type, addressing, and controller configuration before replacement.
For maintenance, confirm the full XFR824A model code and inspect the override switches, relay contacts, socket terminals, and status indicators. Because the module may switch mains-level AC loads, isolate connected circuits and follow the panel’s safety procedure before handling wiring. After installation, test both automatic control and manual override behavior, including the configured output response to a communication fault.
Product Introduction
When a building control output fails, technicians need to distinguish a relay fault from a control-logic or communication problem. The Honeywell XFR824A provides six changeover relay outputs with local Auto/0/1 manual overrides for Excel 800 Panel Bus applications.
Its manual controls support commissioning and troubleshooting without changing the controller’s normal output command logic. Verify contact ratings, terminal socket compatibility, and the configured communication-failure state before returning equipment to service.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | XFR824A |
| Manufacturer | Honeywell |
| System | Excel 800 / Excel 5000 Open System |
| Bus Type | Panel Bus |
| Product Type | Pluggable relay output module |
| Number of Outputs | 6 |
| Relay Type | Changeover contacts (NO/NC/common) |
| Manual Override | Individual Auto/0/1 switch per output |
| Output Status | Yellow LED per output; flashes in manual override mode |
| Manual Override Feedback | Provided to the controller |
| Configurable Communication-Failure State | Remain, OFF, or ON |
| AC Load Voltage | 19–250 VAC |
| Total Module Load | 12 A maximum AC; 12 A resistive or 3 A inductive DC |
| Normally Open Contact Rating | 4 A AC resistive/inductive; 4 A DC resistive or 1 A DC inductive |
| Normally Closed Contact Rating | 2 A AC resistive or 1 A AC inductive; 2 A DC resistive or 1 A DC inductive |
| Minimum Contact Load | Greater than 50 mW |
| Terminal Socket | XS824-25 push-in or XSU824-25 screw type |
| Power Consumption | 140 mA at 24 VAC; 80 mA at 24 VDC, per system data |
| Installation | Pluggable module with separate terminal socket |
| Operating Temperature | 0°C to +50°C, per product references |
| Protection Rating | Verify the installed assembly and cabinet requirements |
| Lifecycle Status | Confirm current status with Honeywell or the supplier |
| Condition | Confirm for the individual unit |
XFR824A
Related Products
These modules and accessories belong to the Honeywell Excel 800 I/O family. Their functions differ, so confirm the bus type and required behavior before selecting an alternative.
- XF824A — Six-relay Panel Bus output module without manual overrides. Similar relay function, but it lacks the local manual switches.
- XFLR824A — Six-relay LONWORKS Bus output module with manual overrides. The bus architecture differs from the XFR824A Panel Bus version.
- XFL824A — Six-relay LONWORKS output module without manual overrides.
- XFR822A — Eight-channel analog output module with manual overrides for modulating control signals.
- XF822A — Eight-channel analog output module without manual overrides.
- XFR825A — Three-channel floating actuator output module with manual overrides, intended for compatible floating-control applications.
- XCL8010A — Excel 800 controller module that coordinates the Panel Bus I/O modules.
- XS824-25 — Push-in terminal socket for relay and floating output modules.
- XSU824-25 — Screw-terminal socket for relay and floating output modules.
- XS812RO — Manual disconnector accessory for relay output modules; verify its application and voltage limitations before use.
Frequently Asked Questions
What is the Honeywell used for?
It switches six external control circuits through relay contacts in a Honeywell Excel 800 Panel Bus system. Typical applications include controlling suitable pumps, fans, valves, and other building automation equipment.
Can I hot-swap the ?
Honeywell’s Excel 800 documentation states that the removable electronic module can be exchanged without disrupting the power and bus connections. However, this does not mean connected load circuits are safe to work on live. Follow the system’s service procedure and isolate hazardous field voltages as required.
Does the have manual override switches?
Yes. It has individual Auto/0/1 override switches for its six relay outputs. The output LED flashes when the channel is in manual override, and the module sends override status feedback to the controller.
Can I replace the with an XF824A?
The XF824A also provides six relay outputs, but it does not have the ‘s manual override switches. If local override capability is required by the maintenance procedure or application, the XF824A is not functionally equivalent. Verify the required behavior before substitution.
What happens if communication with the controller fails?
The Excel 800 system supports a configurable safety response for the relay outputs: remain in their current state, turn OFF, or turn ON. The actual response depends on the application configuration and should be confirmed before commissioning.
How can I verify the condition and authenticity of a replacement?
Check the Honeywell model marking, the six override switches, output indicators, connector pins, and terminal socket compatibility. Request photographs of the actual unit and available functional test records. Confirm whether it is new, used, or refurbished; appearance alone does not establish relay-contact condition.
What should I check before ordering?
Confirm the model code, Panel Bus compatibility, socket type, contact ratings for the connected AC or DC loads, and required manual override behavior. Check the warranty, condition, and available testing evidence. For an installed system, record the output mapping and communication-failure settings before replacement.
