Grundfos Comfort 595916

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Summary

Product Introduction

3.1 Introduction

General overview of the Grundfos Comfort System and its purpose.

3.2 Delivery and Handling

Instructions for inspecting and handling the product upon delivery to prevent damage.

3.3 Applications

Specifies intended indoor residential potable water use and limitations.

3.4 Identification

Explains how to find pump electrical requirements on the nameplate.

Installation

4.1 Pre-installation Checklist

Review all procedures before installation to ensure proper and safe setup.

4.2 Electrical Requirements

Details grounding requirements and voltage compatibility for safe operation.

4.3 Three-step Installation Procedure

Step-by-step guide covering pump and valve installation, and final connections.

Technical Data

6.1 Approvals

Lists relevant certifications like ANSI/NSF, UL, and IAPMO (UPC/CUPC).

The Grundfos Comfort System is a hot water recirculation system designed to provide instant hot water to faucets in residential homes. This system eliminates the need for a separate return line by utilizing the existing cold water return line, making installation simpler and more cost-effective. It is intended for indoor potable drinking water use only.

Function Description

The primary function of the Grundfos Comfort System is to deliver hot water quickly to the furthest faucets in a home, reducing the wait time for hot water and conserving water that would otherwise be wasted while waiting for the hot water to arrive. The system operates by circulating hot water from the water heater through the hot water supply line and back to the water heater via the existing cold water return line.

The system consists of two main components: a circulator pump and an Undersink Thermal Bypass Valve. The circulator pump, typically a Grundfos UP15 model with a 24-hour timer, is installed on the hot water discharge of the water heater. Its role is to continuously or intermittently pump hot water through the supply lines. The Undersink Thermal Bypass Valve is installed at the furthest faucet from the water heater. This valve is crucial for the system's operation, as it allows hot water to flow into the cold water line, effectively creating a recirculation loop without the need for a dedicated return pipe. When hot water reaches the bypass valve, it senses the temperature and closes, preventing further flow into the cold water line until the hot water cools down again.

The direction of flow is from the water heater, through the recirculation pump, into the hot water supply line, and then back to the water heater through the existing cold water return line, facilitated by the bypass valve. This clever design ensures that hot water is always close to the point of use.

Usage Features

The Grundfos Comfort System offers several features designed to enhance user convenience and energy efficiency:

Instant Hot Water: The most significant benefit is the immediate availability of hot water at the tap, eliminating long waits and reducing water waste.
No Dedicated Return Line Required: The system utilizes the existing cold water line as a return path, simplifying installation and avoiding the need for additional plumbing. This makes it suitable for both new constructions and retrofits.
Timer Control: The circulator pump is equipped with a 24-hour timer, allowing users to program the system to operate during peak hot water usage times. This feature helps conserve energy by preventing continuous pumping when hot water is not needed. The timer offers three control options:
- Continuous Pumping (24 hours/day, 7 days/week): The pump runs constantly, ensuring hot water is always available. This is activated by setting the manual switch to the "ON" position.
- Programmed Pumping: Users can set specific "ON" and "OFF" times using programming tabs on the timer ring. Each tab represents 15 minutes, allowing for precise scheduling. This mode is activated by setting the manual switch to the "TIMER" position.
- No Pumping: The pump remains off, but the timer continues to keep time. This is activated by setting the manual switch to the "OFF" position.
Easy Installation: The system is designed for a three-step installation process, involving the pump installation at the water heater, the thermal bypass valve installation under the sink, and timer settings. The kit includes all necessary components, such as flex hoses and mounting screws, to facilitate installation.
Energy Efficiency: By allowing users to schedule pump operation during specific times, the system helps reduce energy consumption compared to continuous recirculation systems. The thermal bypass valve also plays a role in efficiency by only allowing recirculation when the water in the hot water line cools down.
Quiet Operation: The circulator pump is designed for quiet operation, minimizing disturbance in the home.
Safety Features: The system is designed with safety in mind, including a grounding conductor to reduce the risk of electric shock. Proper installation according to national, state, and local codes is emphasized.
Compatibility: The system is compatible with standard residential potable drinking water systems.

Maintenance Features

The Grundfos Comfort System is designed to be largely maintenance-free, ensuring long-term, trouble-free service with minimal user intervention.

Maintenance-Free Design: The manufacturer states that the Grundfos Comfort System is maintenance-free, meaning no regular servicing or component replacement is typically required under normal operating conditions.
Durable Construction: All components are carefully inspected and tested before shipment to ensure durability and reliability.
Self-Lubricating Pump: The circulator pump is lubricated and cooled by the liquid being pumped, eliminating the need for external lubrication.
Fault Finding Guide: The manual includes a fault-finding section to assist users in diagnosing and resolving common issues, such as no hot water at the faucet or too much hot water on the cold water side. This guide provides step-by-step remedies, including checking installation, opening/closing valves, and reinstalling the bypass valve if necessary.
Disposal Information: Clear instructions are provided for the environmentally sound disposal of the product or its parts, encouraging the use of public or private waste collection services or contacting a Grundfos company for assistance.

While the system is designed for minimal maintenance, it is crucial to follow the installation and operating instructions carefully to ensure optimal performance and longevity. Any issues arising from abnormal operating conditions, accident, abuse, misuse, unauthorized alteration or repair, or improper installation are not covered under warranty.

Grundfos Comfort 595916 Specifications

General

Product Type	Recirculation Pump
Model Number	Comfort 595916
Series	Comfort
Part Number	595916
Frequency	50 Hz
Maximum Operating Pressure	10 bar
Protection Class	IP42
Approvals	CE
Temperature Range	2°C to 110°C