1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the Taco 555-055RP Electric Zone Valve. Please read these instructions carefully before proceeding with installation or use to ensure safe and efficient operation. This valve is designed as a replacement part for specific Taco zone valve models.
2. Product Overview
The Taco 555-055RP is an electric zone valve designed for use with Taco Models 555, 556, 557, and 5101. It features 2-wire thermostat control with an end switch, facilitating precise control over heating or cooling zones in hydronic systems. This component is a replacement valve and seat assembly, crucial for maintaining the functionality of your existing Taco zone valve.
Figure 1: Taco 555-055RP Electric Zone Valve Assembly. This image displays the complete valve and seat assembly, including the brass body, spring, and rubber seals, ready for installation.
3. Specifications
Refer to the table below for detailed technical specifications of the Taco 555-055RP Electric Zone Valve.
Figure 2: Taco 555-055RP Electric Zone Valve with approximate dimensions. This image illustrates the physical size of the valve, showing a height of approximately 2.8 inches (7 cm) for scale.
| Specification | Value |
|---|---|
| Model Number | 555-055RP |
| Brand | Taco |
| Valve Type | Electric Zone Valve |
| Material | Metal |
| Item Dimensions (L x W x H) | 1 x 2 x 3 inches |
| Inlet Connection Size | 2 Inches |
| Inlet Connection Type | Socket Weld |
| Outlet Connection Size | 2 Inches |
| Outlet Connection Type | NPT |
| Number of Ports | 2 |
| Connector Type | Wire |
| Thread Size | 2 inches |
| Manufacturer | American Standard |
| UPC / GTIN | 687752024722 |
4. Setup and Installation
Installation of the Taco 555-055RP Electric Zone Valve should be performed by a qualified technician. Improper installation can lead to system malfunction, property damage, or personal injury.
4.1 Safety Precautions
- Always disconnect power to the heating/cooling system at the main breaker before beginning any installation or maintenance.
- Turn off the water supply to the system and drain the relevant section to prevent water damage.
- Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Ensure all wiring complies with local electrical codes and manufacturer specifications.
4.2 Tools Required
- Adjustable wrench or pipe wrench
- Screwdriver set
- Wire strippers/cutters
- Multimeter (for electrical checks)
- Bucket and towels (for draining)
4.3 Installation Steps
- Prepare the System: Disconnect power and shut off water supply. Drain the system or the specific zone where the valve is located.
- Remove Old Valve (if applicable): Carefully disconnect the wiring from the old valve. Use appropriate tools to unthread or un-solder the old valve from the piping.
- Install New Valve: Apply pipe thread sealant or Teflon tape to the male threads of the new valve (if applicable for NPT connections). Thread the new valve into the piping, ensuring a tight, leak-free connection. For socket weld connections, follow standard welding procedures.
- Wiring: Connect the 2-wire thermostat control and end switch wiring according to the specific wiring diagram provided with your Taco zone valve body. Ensure secure electrical connections.
- Refill and Vent: Slowly refill the system, bleeding air from the highest points. Check for leaks at all connections.
- Restore Power: Once the system is refilled and leak-free, restore power.
- Test Operation: Test the valve by adjusting the thermostat to call for heat/cool in the respective zone. Verify that the valve opens and closes correctly.
5. Operating Instructions
The Taco 555-055RP Electric Zone Valve operates in conjunction with a thermostat to control the flow of heating or cooling fluid to a specific zone. When the thermostat calls for heat or cool, it sends an electrical signal to the valve. The valve's motor then opens the valve, allowing fluid to flow. Once the desired temperature is reached, the thermostat signals the valve to close, stopping the flow.
- Ensure your thermostat is correctly programmed for the desired temperature settings.
- The valve's end switch provides a signal to the circulator pump or boiler, indicating that the zone is open and ready for fluid circulation.
- Observe the valve's operation during the first few cycles to confirm it opens and closes smoothly.
6. Maintenance
The Taco 555-055RP Electric Zone Valve is designed for reliable operation with minimal maintenance. However, periodic checks can help ensure its longevity and proper function.
- Annual Inspection: Annually, inspect the valve for any signs of leaks around the connections. Address any leaks promptly.
- Wiring Check: Verify that all electrical connections are secure and free from corrosion.
- Operational Check: During seasonal startups, observe the valve's operation to ensure it opens and closes fully and smoothly.
- Cleaning: Keep the exterior of the valve clean and free from dust or debris. Do not use harsh chemicals.
- Replacement: As this is a replacement part, if the valve assembly shows signs of wear, damage, or consistent malfunction, it should be replaced with an authentic Taco replacement part.
7. Troubleshooting
This section provides solutions to common issues you might encounter with your electric zone valve.
| Problem | Possible Cause | Solution |
|---|---|---|
| Valve not opening/closing | No power to the valve; Faulty thermostat; Damaged wiring; Valve motor failure; Obstruction in valve. | Check power supply and circuit breaker. Test thermostat operation. Inspect wiring for damage. If motor or valve is faulty, replace the valve assembly. |
| Zone not heating/cooling | Valve not opening; Air in the system; Circulator pump issue; Boiler/chiller malfunction. | Verify valve operation. Bleed air from the system. Check circulator pump and boiler/chiller for proper function. |
| Constant heating/cooling in a zone | Valve stuck open; Thermostat wiring issue; Faulty thermostat. | Check if the valve is physically stuck. Inspect thermostat wiring for shorts. Test or replace the thermostat. If the valve is faulty, replace the valve assembly. |
| Water leak at valve connections | Loose connections; Damaged pipe threads; Improper sealant. | Tighten connections. If necessary, drain system, disassemble, reapply thread sealant/tape, and reassemble. |
If you are unable to resolve an issue after following these steps, contact a qualified HVAC technician.
8. Warranty Information
The Taco 555-055RP Electric Zone Valve is covered by a manufacturer's warranty. For specific details regarding warranty terms, duration, and claim procedures, please refer to the official warranty documentation provided by Taco or visit their official website. Keep your proof of purchase for warranty claims.
9. Customer Support
For technical assistance, replacement parts, or further inquiries regarding the Taco 555-055RP Electric Zone Valve, please contact Taco customer support directly. Refer to the contact information provided on the product packaging or the official Taco website for the most up-to-date support channels.