Grundfos 52722512 3-Speed Circulator Pump with Flow Check Instruction Manual

1. Introduction and Overview

This manual provides essential information for the safe and efficient installation, operation, and maintenance of the Grundfos UPS26-99FC 3-Speed Circulator Pump, model 52722512. This cast iron circulator pump features a built-in flow check and is designed for closed-loop heating systems, including radiant, hydronic, radiator, and fan coil applications. Its three-speed settings (Low/Medium/High) offer versatility for various heating demands. An integrated automatic resetting thermal protection mechanism ensures motor safety and extends the pump's operational life.

Figure 1: Grundfos 52722512 3-Speed Circulator Pump. A red cast iron circulator pump with a black electrical housing on the left side. The pump body has 'Grundfos Circulation Pump' and model details printed on it, along with a 'WITH CHECK VALVE' indicator.

2. Safety Information

Read all instructions carefully before installation and operation. Failure to follow these instructions may result in serious injury, property damage, or death. This pump is intended for indoor use only.

• Electrical Safety: Ensure power is disconnected at the main circuit breaker before any installation, maintenance, or service. All electrical wiring must be performed by a qualified electrician and comply with local codes and regulations.
• Hot Surfaces: The pump and connected piping can become hot during operation. Allow components to cool before handling.
• Pressure: Heating systems operate under pressure. Depressurize the system before opening any connections.
• Water Damage: Be prepared for potential water leakage during installation or maintenance.
• Lifting: The pump has a weight of approximately 4.84 pounds (2.2 kg). Lift with care to prevent injury.

3. Product Features

• 1/6 horsepower motor.
• Flow Range: 0-33 Gallons Per Minute (GPM).
• Head Range: 0-29 feet.
• Motors: 2 Pole, Single Phase, 115-Volt.
• Connections: Flanged 1/2-Inch, 3/4-Inch, 1-Inch, 1-1/4-Inch.
• Maintenance-free design.
• Low energy consumption.
• Easy to install.
• Quiet running operation.
• Built-in flow check valve eliminates the need for a separate in-line check valve.
• Automatic resetting thermal protection for motor safety.

4. Specifications

Figure 2: High Head Curves. This graph illustrates the performance characteristics of various Grundfos circulator pumps, including the UPS26-99, showing the relationship between flow rate (GPM) and head (feet).

5. Installation

Installation should be performed by qualified personnel in accordance with all applicable local and national codes. Ensure the system is depressurized and cooled before beginning.

1. System Preparation: Turn off the heating system and allow it to cool. Close isolation valves to isolate the section where the pump will be installed. Drain the system water from this section.
2. Mounting: The pump should be installed in a horizontal position with the motor shaft horizontal to ensure proper lubrication and cooling. Use appropriate flanges for connection to the piping system (1/2-inch, 3/4-inch, 1-inch, or 1-1/4-inch).
3. Electrical Connection: Connect the pump to a dedicated 115-volt, single-phase electrical supply. Ensure proper grounding. Refer to the wiring diagram inside the terminal box cover.
4. Priming: After installation and before starting, slowly refill the system with water. Vent any air from the pump and system to ensure proper priming. The built-in flow check valve will automatically open with flow.
5. Leak Check: Inspect all connections for leaks after refilling the system and before restoring power.

6. Operation

The Grundfos 52722512 circulator pump is designed for continuous operation within its specified parameters. It features three selectable speeds to match system requirements.

• Speed Selection: The pump has a switch or dial to select between Low, Medium, and High speeds. Choose the appropriate speed based on the system's flow and head requirements. Higher speeds provide greater flow and head, while lower speeds consume less energy.
• Flow Check Valve: The integrated flow check valve prevents gravity circulation when the pump is off, improving system efficiency. It operates automatically and does not require manual adjustment.
• Initial Start-up: After installation and priming, restore power to the pump. The pump should start circulating water. Listen for unusual noises, which may indicate air in the system or an obstruction.

7. Maintenance

The Grundfos 52722512 circulator pump is designed to be maintenance-free under normal operating conditions. However, periodic checks can help ensure optimal performance and longevity.

• Annual Inspection: Annually inspect the pump for any signs of external leaks, corrosion, or unusual noises during operation.
• System Water Quality: Ensure the heating system water quality is maintained according to manufacturer recommendations to prevent internal corrosion or scaling that could affect pump performance.
• Cleaning: Keep the exterior of the pump clean and free from dust or debris to ensure proper motor cooling.
• No Lubrication Required: The pump is factory-lubricated and does not require additional lubrication.

8. Troubleshooting

If the pump is not operating correctly, perform the following basic checks. For complex issues, contact a qualified service technician.

9. Warranty and Support

The Grundfos 52722512 circulator pump is covered by a warranty of 2 years from the date of installation. This warranty covers defects in materials and workmanship under normal use and service.

For warranty claims, technical assistance, or to locate an authorized service center, please contact Grundfos customer support. Keep your purchase receipt and installation date records for warranty purposes.

For further information, you may visit the official Grundfos website or consult your local Grundfos representative.