American Standard HVAC BAYDMPR052A Manual

The American Standard BAYDMPR052A is a high-performance HVAC damper motor designed for precise zone control in residential and light commercial heating and cooling systems. This 24VAC, 2-wire, spring-return modulating actuator provides proportional control for balancing airflow in ductwork, ensuring optimal temperature regulation and energy efficiency. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Operation & Calibration 8. Safety Features 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Modulating damper motor, 24VAC transformer connection, manual override lever, adjustable end stops, position feedback potentiometer, and mounting bracket.

Feature	Description
Voltage	24VAC, 50/60Hz operation
Control Signal	Proportional 2-10VDC or 4-20mA (depending on model variant)
Torque	35 lb-in minimum
Stroke Time	Approximately 90 seconds (0-100% travel)
Spring Return	Returns to fail-safe position on power loss
Manual Override	Lever for manual positioning during setup or service
Mounting	Universal bracket for round or rectangular ducts
Enclosure Rating	NEMA 1 for indoor use
Connections	Screw terminals for power and control wiring
Feedback	Potentiometer for position indication to controller

Installation

Unpack and inspect contents. Ensure power is OFF at the breaker before beginning.

Mount the actuator: Secure the mounting bracket to the duct or damper shaft using provided hardware.
Connect the damper: Attach the actuator arm to the damper blade linkage. Ensure smooth, full-range movement.
Wire the unit: Connect 24VAC power to terminals 1 and 2. Connect control signal wires to terminals 3 (+) and 4 (-).
Secure wiring: Use cable clamps and ensure no wires are pinched or strained.

WARNING! Disconnect power before installation. Ensure damper blade moves freely without binding.

First-Time Setup

Apply power; perform initial calibration and adjustment.

Power up: Apply 24VAC. The actuator will move to its fail-safe position.
Set end stops: Adjust the mechanical stops on the actuator body to match the damper's fully open and closed positions.
Calibrate control signal: Using the system controller, send a 2VDC (or 4mA) signal for closed and a 10VDC (or 20mA) signal for open. Verify damper position.
Test operation: Cycle the damper through its full range via the controller to ensure smooth operation.

CAUTION! Keep hands clear of moving parts during calibration. Ensure wiring is correct to prevent damage.

Specifications

Model: BAYDMPR052A
Power Supply: 24VAC ±10%, 50/60Hz, 5VA max.
Control Input: Proportional 2-10VDC or 4-20mA (selectable via internal jumper)
Operating Temperature: 32°F to 140°F (0°C to 60°C)
Humidity Range: 0% to 90% RH non-condensing
Housing Material: Flame-retardant thermoplastic
Shaft Connection: 1/4" square drive, adjustable coupling
Weight: 1.2 lbs (0.54 kg)
Compliance: cULus Listed, RoHS compliant

Controls and Settings

Operation is managed by the connected zone controller or building automation system (BAS).

Manual Override: Use the red lever to manually position the damper for testing or during power loss.

Control Signal Selection: Internal jumper sets input to voltage (2-10VDC) or current (4-20mA) mode. Factory default is voltage mode.

Fail-Safe Position: Spring return drives damper to the pre-set fail-safe position (typically fully open or closed) upon power loss. Direction is field reversible.

Feedback Potentiometer: Provides 0-1000 ohm resistance proportional to damper position for system monitoring.

Connecting Devices

Connect to a compatible 24VAC transformer, zone controller, or BAS panel.

Ensure all system power is OFF.
Run low-voltage Class 2 wiring from the controller to the actuator location.
Connect power (24VAC) and control wires to the correct screw terminals as per wiring diagram.
For multiple actuators, ensure the transformer has sufficient VA rating for the total load.

Tip: Use shielded cable for control signals in electrically noisy environments and ground the shield at the controller end only.

Operation & Calibration

The actuator modulates the damper proportionally based on the received control signal.

Normal Operation: The controller sends a signal corresponding to the desired airflow (e.g., 6VDC = 50% open).
Position Verification: The feedback potentiometer allows the controller to verify actual damper position.
Recalibration: If damper travel becomes inaccurate, recalibrate end stops and control signal range.
Manual Mode: Use the override lever to manually set a position, bypassing automatic control.

WARNING! Do not force the manual override lever against its mechanical stops. This can damage the internal gears.

Safety Features

Spring-Return Fail-Safe: Ensures damper moves to a predetermined safe position (e.g., open for ventilation, closed for fire/smoke) during power failure. Over-Torque Protection: Internal clutch prevents motor damage if damper blade is obstructed.

Care & Maintenance

Periodically inspect for smooth operation. Check linkage for tightness. Clean exterior with a dry cloth. Do not lubricate internal gears.

CAUTION! Disconnect power before any maintenance. Do not use solvents or compressed air for cleaning.

Regulatory Information

This product is cULus Listed to UL Standard 916 and CSA C22.2 No. 205. It complies with relevant FCC Part 15 standards for unintentional radiators. Copyright © American Standard Heating & Air Conditioning. For technical support, visit www.americanstandard.com or contact 1-800-428-4328.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Actuator does not move	No power, incorrect wiring	Verify 24VAC at terminals. Check wiring against diagram.
Damper does not reach full travel	Mechanical stops misadjusted, binding linkage	Readjust end stops. Ensure damper blade and linkage move freely.
Erratic or jerky movement	Low voltage, poor control signal	Check transformer output. Verify control signal is stable and within range.
Actuator hums but doesn't move	Damper blade obstructed, internal clutch slipping	Remove obstruction from damper path. Cycle power to reset.
No position feedback	Failed potentiometer, broken feedback wire	Check resistance across feedback terminals (should vary with position). Check wiring.

Reset: Power cycle the unit. For persistent issues, perform full recalibration.

Service: 1-800-428-4328; www.americanstandard.com