Pentair FNS Plus FNSP 24 User Manual

Rev. G 6-27-03 1 P/N 190033
FNS
®
Plus Vertical Grid D.E. Filter Owner's Manual
SECTION I. FILTER INSTALLATION.
A. GENERAL INFORMATION.
1. The filter should be mounted on a level concrete slab. Position
the filter so that instructions, warnings and the pressure gauge
are visible to the operator. It also should be positioned so that
the piping connections, control valve and drain port are
convenient and accessible for servicing and winterizing.
2. Install electrical controls (e.g., on/off switches, timers, control
systems, etc.) at least five (5) feet from the filter. This will
allow you enough room to stand clear of the filter during
system start up.
3. Allow sufficient clearance around the filter to permit visual
verification that the clamp is properly installed around the tank
flanges, see Figure 1.
a. Tap the clamp with a mallet or similar tool to ensure uniform
loading during clamp tightening.
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
Table of Contents
SECTION I. FILTER INSTALLATION. .......................................................................................... 1
SECTION II. FILTER OPERATION. ................................................................................................ 2
SECTION III. TROUBLE SHOOTING. ............................................................................................. 8
SECTION IV. TECHNICAL DATA. ............................................................................................. 9-10
WARRANTY ............................................................................................................... 11
Important Notice
Attention Installer.
This manual contains important information about the installation, operation and safe use of this product.
This information should be given to the owner/operator of this equipment.
WARNING
Before installing this product, read and follow all warning notices and instructions accompanying this filter. Failure to follow
safety warnings and instructions can result in severe injury, death, or property damage. Call (800) 831-7133 for additional free
copies of these instructions.
Figure 1.
Pentair Pool Products
1620 Hawkins Ave., Sanford, NC 27330 • (919) 774-4151
10951 West Los Angeles Ave., Moorpark, CA 93021 • (805) 523-2400

Pentair FNS Plus FNSP 24 Specifications

General

Filtration Area	24 sq ft
Model	FNSP 24
Manufacturer	Pentair
Inlet/Outlet Size	1.5 inches
Operating Pressure	50 psi
Type	Diatomaceous Earth (DE)
Waste Line Size	1.5 inches

Summary

Important Safety Instructions

Filter Installation Guide

General Installation Information

Details on filter mounting, electrical controls, and clearances for safe, proper installation.

Water Drainage and Electrical Hazard Prevention

Instructions for safely directing water drainage and avoiding electrical hazards during filter positioning.

Pressure Limits and Plumbing Requirements

Advises on the 50 psi maximum working pressure, hydrostatic testing, and proper plumbing connections.

Filter Operation Procedures

Operational Basics and Pressure Monitoring

Explains filter operation under pressure, the importance of the pressure gauge, and DE requirement.

Filter Clamp Installation for Safety

Detailed instructions for correctly installing the filter clamp to prevent lid blow-off during operation.

System Restart After Servicing

Steps to safely restart the filter system after servicing, ensuring pressure relief and air purging.

Diatomaceous Earth (DE) Coating

Guide to preparing and introducing diatomaceous earth (DE) to filter elements for optimal filtration.

Filter Maintenance and Cleaning

Preparing Diatomite (DE)

Details on the quantity and preparation of diatomaceous earth (DE) for filter pre-coating and operation.

Manual Filter Cleaning Process

Step-by-step guide for manually cleaning the filter elements and tank assembly.

Cleaning Using a Separation Tank

Procedure for cleaning the filter using a separation tank, including valve operations and waste disposal.

Filter Element Disassembly and Cleaning

Instructions for disassembling, cleaning (water/acid), and reassembling filter elements for thorough maintenance.

Internal Air Bleed Tube and Relief Valve Cleaning

Guidance on cleaning the internal air bleed tube and the High Flow™ manual air relief valve.

Troubleshooting Common Filter Issues

Air Entry and System Safety Hazards

Identifies causes and dangers of air entering the filter system, including lid blow-off risks.

Pressure Gauge and Filter Run Problems

Addresses pressure gauge readings, short filter runs, liming-up, and diatomite entering the pool.

Technical Data and Specifications

FNS Plus Tank Assembly Parts List

Detailed list of parts for the FNS Plus tank assembly, including part numbers and descriptions.

FNS Plus Flow Rates and Pressure Loss Graph

Provides flow rate data (GPM/GPH) and filter pressure loss curves for different filter sizes.