Installation Manual Viega PureFlow® Water System
Table of Contents Table of Contents 1 2 3 4 5 IM-PF 724596 1021 PureFlow Water System (EN) About this Document_______________________________________ 7 1.1 Disclaimers____________________________________________ 7 1.2 Symbols Used_________________________________________ 8 Product Information_ _______________________________________ 9 2.1 PureFlow Systems______________________________________ 9 2.2 Viega Smart Connect Technology_________________________ 9 2.
Table of Contents 6 7 8 9 4 of 88 Viega PureFlow System Design Considerations______________ 28 6.1 Home Run Systems____________________________________ 28 6.2 Combination Systems__________________________________ 29 6.3 Branch-and-Tee Systems_______________________________ 29 6.4 ManaBloc____________________________________________ 30 6.4.1 Supply and Distribution Line Sizing_______________ 30 6.4.2 Home Run Systems____________________________ 31 6.4.2.1 Design Factors for Home Run System____ 31 6.4.
Table of Contents 10 Installing Manifold Distribution Lines________________________ 51 10.1 Installing Manifold Distribution Lines______________________ 51 10.2 Valve Operation_______________________________________ 52 10.3 Connecting Distribution Lines to the ManaBloc_____________ 53 10.3.1 Port Connections for PureFlow Press Connections__ 53 10.3.2 Port Connections for PureFlow Crimp Connections_ 55 10.4 Connecting Distribution Lines to Fixtures__________________ 56 10.
Table of Contents 14 Pressure Testing Viega PureFlow Systems_ _________________ 78 14.1 General______________________________________________ 78 14.2 Air Testing____________________________________________ 80 14.2.1 Preparing for Air Pressure Test___________________ 80 14.2.2 Pressurizing the System________________________ 80 14.2.3 Completing the Air Test_________________________ 81 14.
About this Document 1 About this Document 1.1 Disclaimers This document is subject to updates. For the most current Viega technical literature please visit www.viega.us. Viega products are designed to be installed by licensed and trained plumbing and mechanical professionals who are familiar with Viega products and their installation. Installation by non-professionals may void Viega LLC’s warranty.
About this Document 1.2 Symbols Used The following symbols may be used within this document: DANGER! This symbol warns of possible life-threatening injury. WARNING! This symbol warns of possible serious injury. CAUTION! This symbol warns of possible injury. NOTICE! This symbol warns of possible damage to property. Notes give additional helpful tips. Limit direct UV exposure (sunlight) to products that have this warning symbol present.
Product Information 2 Product Information 2.1 PureFlow Systems Viega PureFlow systems are the most complete potable water solutions available in the North American market. With tubing, fittings, and distribution manifolds, Viega provides everything you need for a total plumbing system that is not only easy to install but also helps reduce energy costs and water waste. Viega provides the highest-quality PEX tubing with the best UV and chlorine ratings in the industry.
Product Information 2.3 PEX PEX is a material made up of molecules of high density (HDPE) that are permanently linked to each other by a process called crosslinking. This process allows PEX to withstand higher temperatures and pressures compared to standard HDPE tubing, making it ideal for hot and cold potable water applications as well as hydronic radiant heating and cooling systems. There are three common methods of crosslinking polyethylene, two of which are a chemical method and one that is physical.
Product Information PEX tubing with a printed rating of 5306 indicates that it will be suitable for installation areas of constant hot water circulation and has a maximum UV exposure of six months. The UV protection rating is important because certain construction practices and storage conditions subject PEX tubing to sunlight exposure for an extended period of time. UV testing confirms the longevity of the PEX tubing under various lengths of UV exposure.
Product Information 2.5 Safety Please read and understand the instructions before beginning installation to eliminate safety concerns and reduce risks associated with use and handling of Viega products. 2.6 Design Services Viega offers many tools to assist the specifying engineer, engineer, contractor, and installer to ensure Viega PureFlow systems are properly designed and installed. This can be done by referring to one of the resources listed below: ■ Engineering Specifications are available at www.
Product Information 2.7 Listings and Certifications The Viega PureFlow system has the following listings and certifications: ■ Plastic Pipe Institute (PPI) ■ TR 4 Listed Materials: Listing of Hydrostatic Design Bases (HDB), Strength Design Bases (SDB), Pressure Design Bases (PDB), and Minimum Required Strength (MRS) Ratings for Thermoplastic Piping Materials or Pipe. Pressure/Temperature Ratings: 160 psi at 73.
Product Information 2.
Viega Manifolds 3 Viega Manifolds Viega offers several different manifolds to meet a variety of applications, whether it is a parallel water distribution system or combination installation. 3.1 Manifold Markings Each Viega manifold is marked where space permits with the following information: Manufacturer ASTM Standard Temperature Rating Certifications Viega ASTM F877/F1807/F2159/F3347/F3348 180° F UPC®, cNSF®us pw-G, CSA B137.
Viega PureFlow Tubing 4 Viega PureFlow Tubing 4.1 Viega PureFlow PEX Tubing Viega PureFlow PEX cross-linked polyethylene is the ideal tubing choice for potable water systems. In addition, the smooth walls of Viega PureFlow PEX tubing are resistant to corrosion and scaling. 4.1.1 PureFlow PEX Properties and Performance Linear Expansion Coefficient: ■ 1.1 inch per 100 feet per 10° F Temperature and Pressure Ratings: ■ 180° F at 100 psi ■ 73.
Viega PureFlow Tubing 4.1.2 PureFlow PEX Markings Viega PureFlow PEX tubing is marked every five feet with the following representative information.
Viega PureFlow Tubing 4.2 Protecting Viega PureFlow PEX Tubing Protect tubing and fittings from UV exposure. Due to the nature of slab-on-grade installation, tubing and fittings may be exposed to UV light for unspecified periods of time. To prevent damage from UV exposure, all Viega PureFlow PEX tubing and polymer fittings shall be protected with an opaque covering (black plastic polyethylene bag or sheeting) immediately after they have been installed.
Viega PureFlow Fittings 5 Viega PureFlow Fittings 5.1 Viega PureFlow Press Fittings Viega PureFlow Press fittings are available in zero lead bronze and polymer and include a factory-assembled, stainless steel sleeve with three viewing holes and a tool locater ring to ensure a proper press connection.
Viega PureFlow Fittings 5.1.3 PureFlow Press Fitting Markings Each Viega PureFlow Press fitting is marked where space permits with the following information: Manufacturer Viega ASTM Standard ASTM F877 / F3347 (ZL Bronze) / 3348 (Polymer) Temperature Rating 180° F (potable) 200° F (hydronic heating) Certifications cNSF®us pw-G, CSA B137.5, UPC® or UP Code, cULus®, ICC-ES PMG™ 1038 / 1015 Note: All fittings may not be listed with every organization shown.
Viega PureFlow Fittings 5.2.1 PureFlow Crimp Eco Brass Fittings PureFlow Crimp Eco Brass fittings are manufactured from a high-grade zero lead alloy. 5.2.2 PureFlow Crimp PolyAlloy Fittings PureFlow Crimp PolyAlloy fittings are manufactured from a performancegrade polymer (polyphenylsulfone) with excellent chlorine- and corrosionresistant properties. 5.2.
Viega PureFlow Fittings 5.3 Viega PureFlow Tools 5.3.1 PureFlow Press Hand Tools The Viega PureFlow Press connection must always be carried out with the aid of a Viega PureFlow Press tool. The hand tool incorporates a forced compression mechanism to complete a secure connection each time. A ratchet inside the tool prevents the tool from being opened until the proper force has been applied to the press sleeve.
Viega PureFlow Fittings 5.4 Preparing the Tubing ▶ Square off tubing to proper length. Uneven, jagged, or irregular cuts will produce unsatisfactory connections. 5.5 Making Connections with the PureFlow Hand Tool ▶ Insert PureFlow Press fitting with attached sleeve into tubing and engage fully. ▶ Ensure full tubing insertion at view holes in attached press sleeve. Full insertion means tubing must be completely visible in at least two view holes and partially visible in the one.
Viega PureFlow Fittings 1" tool only ▶ For the 1" tool, open the tool handles fully (thumb grip is available to maintain open jaw). Then close tool jaws to engage ratchet (ensure that thumb grip is returned fully forward before closing jaws). For other tools, go to the next step. ▶ Position the PureFlow press tool perpendicular over the press sleeve, resting it against the tool locater ring.
Viega PureFlow Fittings ▶ Extend the PureFlow press tool handle and continue ratcheting until automatic tool release occurs at the proper compression force. CAUTION! Do not press twice. low PureF 1/2” 5.6 Making Connections with the PureFlow Press Power Tool ▶ Insert PureFlow Press fitting with attached sleeve into tubing and engage fully. ▶ Ensure full tubing insertion at view holes in attached press sleeve.
Viega PureFlow Fittings ▶ Open jaw and position perpendicular over press sleeve, resting it against the tool locater ring. The tool locater ring must be in the factory-installed position while making a press to ensure a consistent leak-proof connection. It may be necessary to rotate the tool locater ring to avoid interference between the ring and tool. ▶ Start the pressing process; hold the trigger until the jaw has automatically released. ▶ When press connection is complete, open and remove the jaw.
Viega PureFlow Fittings 5.7 Making Connections with the PureFlow Crimp Hand Tool ▶ Slide the crimp ring onto the tubing and insert the fitting into the tube to the shoulder or tube stop. ▶ Position the ring ⅛" to ¼" from the end of the tubing. 1 /8” to ¼” ▶ The ring must be attached straight. Center the crimping tool jaws exactly over the ring. Keep the tool at 90° and close the handles completely. CAUTION! Do not crimp twice.
Viega PureFlow System Design Considerations 6 Viega PureFlow System Design Considerations There are three installation methods that Viega recommends to help enhance your water distribution systems performance by reducing water waste and hot water delivery times. These methods consist of the home run, combination, and branch-and-tee systems. The following sections provide information to help select the best system based on the application. 6.
Viega PureFlow System Design Considerations 6.2 Combination Systems A combination system uses multiple manifolds combined with a branchand-tee supply system. This system uses various sizes of manifolds located throughout a structure placed near each main fixture group and are supplied by the main hot and cold supply lines similar to the branch-and-tee system. Multiple branch lines are connected to a manifold in a common location in lieu of multiple tees spread throughout the system.
Viega PureFlow System Design Considerations 6.4 ManaBloc The general sizing information shown may be appropriate for many ManaBloc installations. These recommendations are based on flow rates of typical fixtures that require 8 psi residual pressure. The length of distribution tubing run between the Viega ManaBloc and each fixture shall be 60 feet or less to maximize optimal performance of the ManaBloc system.
Viega PureFlow System Design Considerations 6.4.2 Home Run Systems 6.4.2.1 Design Factors for Home Run System Water Heater Placement The Viega ManaBloc should be as close as possible to the water heater to minimize extra water from being stored in the larger hot water supply lines between the ManaBloc and water heater. The longer the hot water supply line is, the greater the volume of water needed to purge through that line and faucet before hot water is available.
Viega PureFlow System Design Considerations 6.4.2.2 Plumbing Code Compliance (Home Run / Parallel Systems) The Viega ManaBloc system is listed to ASTM F876/F877 standards for cross-linked polyethylene (PEX) distribution systems.
Viega PureFlow System Design Considerations 6.5 System Sizing and Calculations 6.5.1 General The Viega PureFlow system should be designed following standard plumbing engineering practice. Follow local codes to determine minimum tubing size and required fixture pressures. Pressure drop through fittings can be estimated from the charts below.
Viega PureFlow System Design Considerations 6.5.3 Viega PureFlow PEX Tubing 6.5.3.1 Flow Velocity Flow Velocity ft/sec Flow Rate GPM 0.5 0.75 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 34 of 88 ⅜ ½ 1.7 2.5 3.3 5.0 6.7 8.3 10.0 0.9 1.4 1.8 2.7 3.6 4.5 5.4 6.3 7.2 8.1 9.1 10.9 ¾ 0.7 0.9 1.4 1.8 2.3 2.7 3.2 3.6 4.1 4.5 5.4 6.4 7.3 8.2 9.1 10.0 10.9 11.8 Velocity > 12 ft/ sec 1 0.5 0.
Viega PureFlow System Design Considerations 6.5.3.2 Pressure Loss Viega recommends the following velocities for hot and cold PEX water distribution systems: ■ Domestic cold water — 10 fps ■ Domestic hot water — 8 fps The flow velocity through Viega’s PEX fittings does not fall under these limitations. The equivalent length of PEX tube for Viega PureFlow fittings is available from Viega to assist in system sizing where applicable (refer to "6.5.2 Viega PureFlow Fittings Sizing" on page 33). Flow Rate GPM 0.
Water Service Installation 7 Water Service Installation 7.1 Below Grade and Service Line Viega PureFlow PEX tubing may be used underground and for water service piping. When running lines underground, it is important to provide a stable, continuous trench base to support the tubing. Always allow sufficient slack when tubing is laid in trenches. Snake the tubing slightly side-to-side to provide for contraction due to temperature change. Do not use blocking to support tubing.
Water Service Installation Concrete 6" min. Compact Initial Haunching Backfill Bedding Backfill material must be free of large rocks, glass, or other sharp objects. Provide sufficient coverage over tubing so that expected traffic loads will not deform tubing (consult local codes). Compact this material to at least 6" above the tube. Do not install Viega PureFlow PEX tubing where soil is or may become contaminated with solvents, fuels or similar chemicals.
Water Service Installation 7.4 Concrete Viega PureFlow PEX tubing can be installed within concrete slabs. All penetration points must be sleeved to prevent tubing damage (entry/exit points, expansion joints, etc.). Penetrations in walls, etc., may be sealed with silicone caulk. Do not use oil-based caulk. Best practice dictates that only continuous lengths of tubing should be run within the slab. Viega does not recommend the installation of fittings within a slab as part of a design.
Installing the ManaBloc 8 Installing the ManaBloc 8.1 Overview A typical 24-port ManaBloc includes the components listed below. Hot Water Supply Inlet Valve Key Internal Divider Plate Hot Port(s) Cold Port(s) Port Valve Cold Water Supply Inlet or Outlet Cold Port(s) Cold Water Supply Inlet or Outlet Plastic Mounting Bracket Additional package contents include: ■ Valve T-Handle ■ Instruction Sheet/Drill Guide ■ Port Labels 8.
Installing the ManaBloc BEFORE INSTALLING THE MANABLOC, MAKE SURE THE LOCATION REQUIREMENTS HAVE BEEN MET. Take extra caution when handling the ManaBloc in temperatures that are below freezing. Tubing penetrations may require sleeving or the installation of an insulator. 18" to 8' total developed tube length 36" min. 40 of 88 1. UNDER NO CIRCUMSTANCES shall the ManaBloc be located in a permanently covered area (behind sheetrock, plywood, paneling) or where freezing temperatures may occur.
Installing the ManaBloc Non-flow-thru piping Top supply (Bull head tee) Hot water from W/H Cold water to W/H Hot water from W/H Cold water supply Water service (cold) Flow-thru piping (standard) Water service (cold) ManaBloc Supply Piping Options Non-flow-thru piping Top supply (Standard) Hot water from W/H Cold water supply to W/H Cold water to W/H Bull head tee End cap Water service (cold) End cap If a main inlet/outlet will not be used, it must be capped. (Use part number 53601.
Installing the ManaBloc 8.3 Draining the ManaBloc Unit If the ManaBloc system has been filled with water and there exists the possibility that the ambient temperature will drop close to or below 32° F (0° C), the ManaBloc unit MUST be drained to prevent irreparable damage. The process of draining involves loosening and removal of one or more supply line connections and two distribution lines from the ManaBloc. Depending on the installation, some supply connections may be capped.
Installing the ManaBloc 8.4 Draining the ManaBloc System 1. Loosen and remove all of the supply line connections (or caps) and all of the distribution lines from the ManaBloc. 2. Remove the four attachment screws and withdraw the ManaBloc unit from its mounting. Note: Grasp the unit firmly before removing the last attachment screw to prevent the unit from falling and being damaged. 3.
Mounting the ManaBloc 9 Mounting the ManaBloc Where space permits, Viega recommends mounting the ManaBloc on a surface rather than between studs for ease of accessibility and replacement should a different ManaBloc port configuration be desired in the future. 9.1 Mounting Between Studs with Mounting Straps Dimensions in these instructions are for 16" stud centers and must be adjusted for other stud spacing. Once the general location of the ManaBloc has been determined (see "8.
Mounting the ManaBloc A residence intended for disabled persons may require that the ManaBloc be mounted lower in the wall to provide access. Attach here first 3. Standing behind the stud wall, hold the ManaBloc facing away from you and align the top of the UPPER mounting strap to the line on the stud that you made in Step 2. Loosely attach this mounting strap flush to the back outer edge of one stud using a ¾" or longer drywall or other suitable wood screw (A) (see illustration to left). 4.
Mounting the ManaBloc 9. Push a small nail through the printed center line at one end of the Drill Guide (A). Push the nail into the cross formed where the top port mark intersects with the 1⅝" mark. Tap the nail into the stud to hold the Drill Guide in place. 10.Push a small nail through the printed center line on the lower end of the Drill Guide with the center line of the port (B). Tap the nail into the stud to hold the Drill Guide in place. 11.
Mounting the ManaBloc 9.2 Mounting Between Studs without Mounting Straps If not using the mounting straps: 1x4 (Top view) 1x4s attach at the back, inside the studs, and the ManaBloc is centered between the studs. Step C: Distance between top and bottom of 1x4s equal to length of ManaBloc (Front view) IM-PF 724596 1021 PureFlow Water System (EN) 1. Cut two pieces of lumber (1x4 — or ¾" plywood — approximately 3½" wide) to a length that provides a snug fit BETWEEN two studs. 2.
Mounting the ManaBloc 9.3 Mounting the ManaBloc – Surface Mount 22½" Longer than ManaBloc 2x4 2x4 22½" MANABLOC® 1. A suitable base for the ManaBloc can be constructed from a section of ½" or thicker plywood that is a minimum 22½" wide and slightly longer than the overall length of the ManaBloc. 2.
Mounting the ManaBloc 9.4 Mounting the MiniBloc 2 1 3 4 5 6 1. For proper bracket spacing, measure distance between the center ribs of the first and last MiniBloc modules. Mark this distance on the selected mounted surface. 2. Align the outside edge of each bracket within each end mark. Mounting brackets shall be mounted level and parallel to each other before affixing the MiniBloc manifold. NOTE: Use both mounting brackets provided with each MiniBloc manifold.
Mounting the ManaBloc 9.5 Mounting PureFlow Press and PureFlow Crimp Polymer Manifold Viega recommends using a minimum of two mounting brackets on manifolds with three ports and larger. 1. Measure the distance (A) between the first and last set of manifold ports (as shown). Using a straight edge, mark dimension (A) on mounting surface. Ensure the mounting surface is level and suitable to support the weight of the manifold filled with water. A 1 2 3 4 5 6 2.
Installing Manifold Distribution Lines 10 Installing Manifold Distribution Lines 10.1 Installing Manifold Distribution Lines Run distribution lines continuously in the most direct route from the ManaBloc to the fixtures.
Installing Manifold Distribution Lines CAUTION! DO NOT USE DUCT TAPE FOR BUNDLING. Duct tape will not permit tubing movement. 6. Bundles can be supported with hangers designed for larger tubing sizes. 7. The nylon ties can be used to support PEX lines directly from wooden framing members. Any plastic cable ties capable of supporting the weight of the tube or bundle when filled with water can be used. 8. Holes drilled through studs, joists, plates, headers, etc.
Installing Manifold Distribution Lines 10.3 Connecting Distribution Lines to the ManaBloc CAUTION! The water supply to the ManaBloc and the port valves shall be turned off before attempting installation of PEX connections. PureFlow Press and PureFlow Crimp models are available and included with each ManaBloc model. Supply connections are not included and must be ordered separately. If there are unused ports, Viega recommends capping them to protect from the home owner opening the wrong valve.
Installing Manifold Distribution Lines 4. Remove tool locater ring (B) and slide swivel nut (C) over tubing as shown. B C A 5. Ensure sealing element (A) is in place and clean of any dirt or debris. Wet sealing element with tap water. 6. Insert the fitting into the desired port until the fitting flange sets flush with the end of the port. C 7. Thread the swivel nut (C) onto the ManaBloc port. Hand-tighten only. Open the port valve(s) before turning on the main water supply. Hand-tighten only.
Installing Manifold Distribution Lines 10.3.2 Port Connections for PureFlow Crimp Connections The water supply to the ManaBloc and the port valves shall be turned off before attempting installation of crimp adapters. CAUTION! Use only sealing elements supplied with the adapters. A B C D 1. Ensure sealing element (A) is in place. B C D 2. Slide the supplied swivel nut (D) and a crimp ring (C) onto the tubing and insert the barbed end of the fitting (B) fully into the end of the tubing as shown.
Installing Manifold Distribution Lines Hand-tighten only. Damage may result if over-tightened. UNDER NO CIRCUMSTANCES shall any form of thread sealant (Teflon® paste, pipe dope, etc.) be used on distribution line connections. The carriers present in these compounds can crack the plastic port connections, resulting in leaks and water damage. 10.
Installing Manifold Distribution Lines 3. If copper sweat fittings are used anywhere in the ManaBloc water supply line or water heater supply/return lines, these fittings must be soldered, cooled and flushed of any flux residue before these lines are connected to the ManaBloc. Soldering creates a tremendous amount of heat, which could melt the ManaBloc, and solder flux contains strong acids and may also contain petroleum products.
Installing the Viega PureFlow PEX Tubing System 11 Installing the Viega PureFlow PEX Tubing System 11.1 Handling PureFlow PEX Tubing The properties of Viega PureFlow PEX tubing make it easy to work with and install in most types of construction. Some care must be taken to prevent damage to the tubing before and during installation: ■ Use care to protect Viega PureFlow PEX tubing from physical damage during storage and installation. Keep the tubing away from sharp objects, open flames, etc.
Installing the Viega PureFlow PEX Tubing System 11.3 Bending PureFlow PEX Tubing Viega PureFlow PEX tubing can be free bent (unsupported bend) to a minimum radius of eight times the tubing O.D. and five times the tubing O.D. with the use of a Viega-approved bend support. For situations requiring tighter bends, use elbow fittings. If bending against a PEX coil bend direction, the bending radius is 24 times the tubing O.D.
Installing the Viega PureFlow PEX Tubing System 11.4 Removing PureFlow Connections Should a mistake be made, simply cut out the PureFlow fitting and replace with a new one. CAUTION! Do not reuse Viega PureFlow fittings 11.5 Repairs Sections of kinked tubing should be repaired by cutting out the damaged section and installing a repair coupling. 11.
Installing the Viega PureFlow PEX Tubing System 11.7 Water Heaters Viega PureFlow PEX tubing should not be connected directly to gas-fired water heaters. The high temperatures of these appliances can damage the tubing. When connecting a Viega PureFlow system to a gas-fired water heater, install a minimum of 18" of metallic piping between the water heater and tubing, keeping tubing more than 6" away from the vent pipe.
Fastening the Viega PureFlow System 12 Fastening the Viega PureFlow System 12.1 Wood Frame Construction Viega PureFlow PEX tubing is ideal for use in wood frame construction. The ability to bend the tubing around corners and obstacles greatly simplifies installation. This system eliminates the expensive and timeconsuming use of fittings where tubing turns within a wall, and it eliminates the potential fire hazard of soldering close to exposed framing members.
Fastening the Viega PureFlow System 12.3 Supporting PureFlow PEX Tubing CAUTION! Use only plastic or plastic-coated tubing supports. Metal supports may damage tubing. When running tubing, leave a small amount of slack between fasteners to account for tubing contraction. Note that Viega PureFlow PEX tubing will expand or contract 1.1" per 100' for every 10° F of temperature change. In long straight runs, allow adequate clearance for this (see "Tubing Expansion" on page 66).
Fastening the Viega PureFlow System 12.4 Noise and Water Hammer in PureFlow Systems As with all plumbing materials under some operating conditions, water hammer can occur in PEX plumbing systems. The inherent flexibility of Viega PureFlow PEX drastically reduces the magnitude of pressure surges compared with metallic plumbing materials. Damage to plumbing components in a PEX system due to these pressure surges is highly unlikely, although noise can sometimes result.
Fastening the Viega PureFlow System 12.7 Expanding Foams When penetrations must be sealed for air infiltration purposes, there are several options available. Use a good grade of silicone, acrylic, or siliconized acrylic caulking. DO NOT use oil-based caulks. Most canned expanding foams and open- or closed-cell pipe insulation are good sealing materials and may be used in direct contact with PEX tubing. Other materials may be used provided they do not cause short- or longterm damage to the PEX tubing.
Fastening the Viega PureFlow System 12.9 Tubing Expansion Viega PureFlow PEX tubing, as with any PEX tubing, expands and contracts with temperature changes in the environment or the fluid inside the tubing. The longer the tubing run and the higher the temperature change, the more linear expansion the system will experience. This expansion and contraction can affect the appearance as well as integrity of the system by putting stress on the tubing, fittings, valves, and fasteners.
Fastening the Viega PureFlow System 12.10 Calculating Expansion Loops and Offsets There are three types of expansion offsets recommended for use with large-diameter tubing: ■ Corner expansion offset ■ Z-type expansion offset ■ U-type expansion loop A description, illustration, and dimensions chart for each type of offset are on the next few pages. 12.10.
Fastening the Viega PureFlow System 12.10.3 Corner Expansion Offset Where piping takes a corner after a long straight run, a simple 90° elbow in the piping will allow for the absorption of expansion. LT ∆L Anchor point Calculate the necessary “L” dimension between elbow and nearest fastener or use the chart below, which was figured using the maximum run for a single expansion compensator (50 feet). Following the previous example: L L = C√OD x ΔL Where: C = 12 OD = 1.125 (1" PEX) ΔL = 2.64" L = 12√1.
Fastening the Viega PureFlow System 12.10.4 Z-Type Expansion Offset The Z-type expansion offset integrates two 90° elbows that form a “Z” pattern. L2 = 5.18" With this type of configuration ½ of the “L” dimension is applied to the center area of the “Z” (represented as L1 in the table and illustration) while ¼ of the “L” dimension would be applied to each of the top and bottom areas (represented as L2). L1 = 10.
Fastening the Viega PureFlow System 12.10.5 U-Type Expansion Offset The U-type expansion loop integrates four 90° elbows that form a “U” pattern. L4 = 8.28" With this arrangement ⅕ of the “L” dimension is applied as the width (represented as L3) while ⅖ of “L” is applied as each leg in the other dimension (represented as L4). L4 = 8.28" Calculate the necessary L3 and L4 dimensions or use the chart below, which was figured using the maximum run for a single expansion compensator (50 feet). L = 20.
Fastening the Viega PureFlow System To fixture To fixture 12.11 Domestic Hot Water Circulating Systems Hot water supply Hot water supply Hot return Circ pump Check valves Cold Hot Cold supply to W/H A hot water circulation system can be incorporated into most plumbing systems and works by constantly (or periodically throughout the day on a timer) circulating hot water through the main hot supply line of your plumbing system.
Fastening the Viega PureFlow System Viega PureFlow PEX can be used in recirculating domestic hot water plumbing loops, provided: 1. The plumbing loops shall operate with water temperatures of 140° F or lower, as required by most model plumbing codes. 2. The recirculating loop is for supplying hot water more quickly to the fixture. 3. The tubing is marked as rated for “continuous recirculation” as evidenced by the ASTM F876 certification marking PEX 5306 (CL5).
Installing Viega PureFlow Fittings 13 Installing Viega PureFlow Fittings 13.1 Stub Out Options The Viega PureFlow system includes fittings to accommodate most plumbing needs. Stub outs are available for a variety of fixture situations, as well as fittings and valves to connect to other plumbing materials and fixtures. Copper Stub Out Standard stub outs with 90° bends and a closed end to facilitate pressure testing are available in either ⅜" or ½" PEX x ½" copper.
Installing Viega PureFlow Fittings Half-inch, snap-in bend supports are also available with a metal mounting bracket (sold separately) for quick and easy stub outs with ½" Viega PureFlow PEX tubing. Seven stub out locations and numerous nail holes make this a versatile option for stubbing out any number of lines or supporting tubing near manifolds. Snap-in Bend Supports with Bracket 13.
Installing Viega PureFlow Fittings 13.2.1.2 Use of Proper Flux and Solder Only use flux containing chloride compounds. Solder fluxes without chloride compounds are not recommended for use on zero lead alloys. Thoroughly wipe any solder or flux left behind. CAUTION! Only lead-free solder should be used to make zero lead solder connections. 13.2.1.
Installing Viega PureFlow Fittings 13.4 Valves In-line ball valves are available for use with Viega PureFlow PEX tubing. These brass finish valves may be used anywhere an in-line valve is needed. ¼-Turn Straight Stop Valve PureFlow Press to ⅜" O.D. Riser ¼-Turn Straight Stop Valve PureFlow Crimp to ⅜" O.D. Riser Stop valves have ⅜" or ½" PEX inlets and ¼" CTS (⅜" O.D.) riser outlets and are available in both straight and angled versions depending on installation requirements.
Installing Viega PureFlow Fittings 13.5.2 Riser Connections Thread fixture nut onto fixture shank. Tighten fixture nut hand-tight plus an additional ½-turn. Fixture shank Riser cone Slide compression nut and supplied plastic ferrule over tube as shown. The long taper of the ferrule goes toward the valve. Tighten compression nut according to valve manufacturer’s recommendations. Fixture nut Compression Nut Plastic ferrule 13.5.
Pressure Testing Viega PureFlow Systems 14 Pressure Testing Viega PureFlow Systems 14.1 General Upon the completion of installing a Viega PureFlow plumbing system, a hydrostatic (potable water) pressure test shall be conducted. If potable water is not available, or the potential for a freezing condition exists, pneumatic* (air or nitrogen) testing and/or the use of an RV antifreeze** solution are also acceptable methods for pressure testing.
Pressure Testing Viega PureFlow Systems WARNING! Water testing shall be avoided during freezing conditions. Under NO circumstances shall the system be tested at temperatures lower than 10˚F (-12˚C). WARNING! FOLLOW ANTIFREEZE MANUFACTURER’S INSTRUCTIONS FOR CONCENTRATIONS. Use only nontoxic antifreeze approved for drinking water systems.
Pressure Testing Viega PureFlow Systems 14.2 Air Testing Air testing of a Viega PureFlow plumbing system shall use the checklist provided to ensure safety. WARNING! It is the responsibility of the installer to read and understand the below pressure testing criteria and all safety precautions. Compressed air can store extremely high energy as compared to compressed water systems. Failure to follow these steps could result in personal injury, death and/or property damage. 14.2.
Pressure Testing Viega PureFlow Systems Stage 2: Gradually increase system pressure to 50 psi (approx. 1-minute duration). ■ Wait for 10 minutes before inspecting pressure gauge. ■ If pressure holds stable, continue to Stage 3. ■ If pressure falls over the test period, look for potential leaks with an approved leak-detect solution. Once system pressure is completely relieved and the leak is fixed, restart testing procedure from beginning. Stage 3: Gradually increase system pressure to 100 psi (approx.
System Disinfection 15 System Disinfection 15.1 General Public potable water distribution systems today generally require some form of residual disinfection to greatly eliminate or render harmless waterborne pathogens such as E. coli and Legionella. Some commonly used disinfection methods include the use of chlorine, chloramines, and chlorine dioxide at levels not to exceed EPA established levels.
System Disinfection 15.2 California Flushing Requirements The State of California requires all installations of PEX piping, where it is the initial plumbing system installed in new construction, shall be flushed twice over a period of at least one week. The piping system shall be first flushed for at least 10 minutes and then filled and allowed to stand for no less than one week, after which all the branches of the piping system must be flushed long enough to fully empty the contained volume.
Installer Checklist 16 Installer Checklist In the event there is a conflict between the contents of this list or any applicable code, the code or the instructions, whichever is more restrictive, shall govern. Tubing Markings ■ ASTM F876 Cross-linked polyethylene (PEX) tubing. ■ ASTM F877 Cross-linked polyethylene distribution systems (connection listed with manufacturer-supplied fitting and PEX tubing).
Limited Warranty 17 Limited Warranty 17.
Limited Warranty systems sold by Viega are not Viega Pureflow PEX tubing or approved connections sold by Viega. Connection to non-Viega plumbing products intended for riser and/or water service applications does not void the system warranty provided all pipe, fittings, valves, and manifolds are sold by Viega after the transition location.
Limited Warranty limited warranty will cover material costs for pipe and fittings only, sold by Viega, not inclusive of any labor or installation costs. Any change in property ownership after the first ten years will nullify any remaining warranty coverage. VIEGA SHALL NOT BE LIABLE FOR CONSEQUENTIAL ECONOMIC LOSS DAMAGES UNDER ANY LEGAL THEORY AND WHETHER ASSERTED BY DIRECT ACTION, FOR CONTRIBUTION OR INDEMNITY OR OTHERWISE.
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