1. Product Overview
The Potter OSYSU-1 is an Outside Stem and Yoke (OS&Y) valve supervisory switch designed to monitor the open position of OS&Y type gate valves. This device ensures that the valve, critical for fire protection systems, remains in its fully open and operational state. It features one Single Pole Double Throw (SPDT) Form C contact, providing reliable signaling for system status.
The switch is housed in a durable red enclosure and includes a metal mounting bracket for secure installation. It is suitable for various industrial electrical control applications where valve position monitoring is essential.
Figure 1: Potter OSYSU-1 supervisory switch. This image displays the Potter OSYSU-1 supervisory switch, showing its red housing, metal mounting bracket, and the stem that interacts with the valve. The label indicates it is a Potter product, model OSYSU-1, and carries UL, cULus, FM, and CE approvals.
2. Safety Information
WARNING: Installation and maintenance must be performed by qualified personnel only. Disconnect all power before servicing the device to prevent electrical shock or equipment damage.
CAUTION: Ensure all wiring complies with local and national electrical codes. Improper wiring can lead to system malfunction or hazards.
- Always wear appropriate personal protective equipment (PPE) during installation and maintenance.
- Verify that the valve is in the correct position before and after switch installation.
- Do not exceed the specified electrical ratings for current and voltage.
3. Setup and Installation
The OSYSU-1 switch is designed for mounting on OS&Y gate valves to detect their open position. Follow these general steps for installation:
- Mounting: Securely attach the switch's metal bracket to the valve yoke using the provided hardware. Ensure the switch stem aligns properly with the valve stem.
- Adjustment: Adjust the switch position so that the internal mechanism activates when the valve is fully open. The switch should signal an alarm if the valve is moved from its fully open position.
- Wiring: Connect the SPDT contacts to the fire alarm control panel or monitoring system. Refer to the wiring diagram provided with the product for specific connections. Ensure proper polarity and secure all connections.
- Testing: After installation, test the switch by slowly closing the valve a small amount to verify that the switch activates and sends a signal to the monitoring system. Return the valve to the fully open position and confirm the switch resets.
For detailed wiring diagrams and specific mounting instructions, consult the technical data sheet provided by Potter.
4. Operating Instructions
The Potter OSYSU-1 operates automatically to supervise the position of an OS&Y gate valve. When the valve is in its fully open position, the switch's internal mechanism is in a normal (non-alarm) state. If the valve stem is moved from the fully open position, indicating the valve is being closed or is not fully open, the switch will activate its SPDT contact.
- Normal Operation: Valve fully open, switch contacts in normal state.
- Alarm Condition: Valve moved from fully open position, switch contacts change state, sending a signal to the connected monitoring system.
The switch is designed for continuous monitoring and requires no manual operation during normal system function.
5. Maintenance
Regular maintenance ensures the reliable operation of the OSYSU-1 supervisory switch.
- Annual Inspection: Visually inspect the switch and its mounting hardware annually for any signs of damage, corrosion, or loose connections.
- Functional Testing: Test the switch's operation at least annually, or as required by local codes and standards. This involves partially closing the valve to trigger the switch and verifying that the alarm signal is received by the monitoring system. Restore the valve to the fully open position after testing.
- Cleaning: Keep the exterior of the switch clean and free from dust or debris. Do not use abrasive cleaners.
Any detected issues should be addressed immediately by qualified service personnel.
6. Troubleshooting
If the OSYSU-1 switch is not functioning as expected, consider the following:
- No Alarm Signal:
- Check wiring connections for looseness or corrosion.
- Verify that the valve is sufficiently moved from the fully open position to activate the switch.
- Inspect the switch mechanism for obstructions or damage.
- Confirm power supply to the monitoring system is active.
- False Alarms:
- Ensure the switch is securely mounted and not subject to vibration.
- Verify the valve is indeed in the fully open position and the switch is properly adjusted.
- Check for intermittent wiring faults.
If issues persist after basic troubleshooting, contact a qualified technician or Potter technical support for assistance.
7. Specifications
| Specification | Value |
|---|---|
| Model Number | OSYSU-1 |
| Operation Mode | Automatic |
| Current Rating | 2 Amps |
| Operating Voltage | 30 Volts (DC) |
| Contact Type | SPDT (Normally Open) |
| Connector Type | Screw Terminal |
| Material | Metal |
| Product Dimensions (L x W x H) | 9.5 x 9 x 3 inches |
| Item Weight | 1 pound |
| International Protection Rating | IP00 |
| Manufacturer | Potter / Amseco |
| UPC | 785192000501 |
8. Warranty and Support
For specific warranty information regarding the Potter OSYSU-1 supervisory switch, please refer to the warranty documentation included with your purchase or visit the official Potter website. General warranty terms typically cover defects in materials and workmanship for a specified period from the date of purchase.
For technical support, service, or replacement parts, please contact Potter customer service directly. Contact information can usually be found on the product packaging or the manufacturer's website.
