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Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | MP904A5047 |
| Actuator type | Pneumatic damper actuator |
| Positioner | Included |
| Stroke | 90 mm |
| Pressure ranges | 21, 35, 70 kPa |
| Effective diaphragm area | 146 cm² |
| Net force at 0 kPa pressure | 550 N |
| Net force at 140 kPa pressure | 600 N |
| Maximum operating pressure | 140 kPa |
| Maximum safe air pressure | 210 kPa |
| Air connection | Barbed fitting for 6 mm (1/4-inch) polyethylene tubing |
| Ambient temperature | −30°C to +70°C |
| Typical application | HVAC damper and airflow control |
Source: Honeywell Field Devices product catalog. Confirm the actuator’s configuration and application requirements against the unit label and applicable installation documentation before ordering.
Product Introduction
The Honeywell MP904A5047 is a pneumatic damper actuator designed to regulate airflow in heating, cooling, and ventilation systems. Its 90 mm stroke and integrated positioner support damper-position control through a pneumatic control signal. The specified pressure ranges are 21, 35, and 70 kPa, with a 146 cm² effective diaphragm area. It is suitable for replacement planning where the existing actuator’s pressure range, mounting arrangement, and mechanical travel match the application.
MP904A5047
MP904A5047
Installation and Configuration Guide
Stage 1: Preparation
- Confirm the model number on the existing actuator and verify that it is MP904A5047.
- Check the required stroke, control-pressure range, available actuator force, and damper linkage.
- Verify that the pneumatic supply and tubing are compatible with the actuator’s specified connection.
- Review the equipment manufacturer’s instructions before beginning work.
Stage 2: Remove the Existing Actuator
- Isolate the pneumatic supply and release residual pressure before disconnecting tubing.
- Label the existing pneumatic lines and linkage positions to preserve the original arrangement.
- Remove the actuator without forcing the damper shaft or damaging the mounting hardware.
Stage 3: Install the Replacement
- Secure the actuator using the mounting arrangement specified for the equipment.
- Connect the pneumatic tubing to the appropriate port.
- Check that the linkage moves freely and that the actuator can complete its specified 90 mm stroke without mechanical interference.
- Confirm the positioner configuration and required pressure range before commissioning.
Stage 4: Power-On and Functional Testing
This actuator operates pneumatically rather than from an electrical supply.
- Restore the pneumatic supply gradually.
- Check all tubing connections for leakage.
- Apply the specified control-pressure range and observe damper movement.
- Verify that the damper reaches its required operating positions and that the linkage does not bind.
- Confirm that the control response is consistent with the HVAC system’s sequence of operation.
Stage 5: Practical Warnings
- Do not exceed the 140 kPa maximum operating pressure or the 210 kPa maximum safe air pressure.
- Do not assume that another MP904 variant is interchangeable solely because the series name matches.
- Confirm the pressure range and mechanical interface before purchasing a replacement.
- If the actuator fails to complete its stroke, inspect the pneumatic supply, tubing, linkage, and positioner setup before concluding that the actuator itself is defective.
Frequently Asked Questions
Q1: What does the Honeywell MP904A5047 do?
It uses pneumatic pressure to position an HVAC damper, helping regulate airflow in heating, cooling, and ventilation systems.
Q2: Does the MP904A5047 require electrical power?
It is a pneumatic actuator, not an electrically powered actuator. The control system must provide the appropriate pneumatic signal and air supply.
Q3: What is the actuator’s stroke length?
The published stroke is 90 mm. Confirm that this travel is compatible with the damper linkage and required movement.
Q4: What pressure should be used?
The catalog lists pressure ranges of 21, 35, and 70 kPa for this model. The correct setting depends on the intended control arrangement. The maximum operating pressure is 140 kPa; the maximum safe pressure is 210 kPa. These limits are not interchangeable.
Q5: Can the MP904A5047 replace another MP904 actuator?
Not automatically. MP904 variants differ in pressure range, positioner configuration, diaphragm area, force characteristics, and temperature limits. Compare the complete part number and application requirements before substitution.
Q6: Is the still available from Honeywell?
The catalog information confirms the model’s technical specifications but does not establish current production or stock status. Ask the supplier to confirm availability, whether the unit is new or refurbished, and whether inspection or test documentation is provided.
Q7: What should be checked if the damper does not move through its full stroke?
Check pneumatic supply pressure, tubing leaks or restrictions, mechanical binding, linkage alignment, and positioner configuration. If the fault persists, compare actual operation with the manufacturer’s service instructions before replacing the actuator.
