MasterFormat: 95
Download this Specification for   WORD | WP | RTF | TEXT
Find over 500 more construction specifications | Arcat.com
         
 
         
SECTION 15770
 
         
RADIANT HEATING AND SNOW-MELTING SYSTEMS
 
         
 
         
Copyright 2014 ARCAT, Inc. - All rights reserved

          ** NOTE TO SPECIFIER ** MrPex Systems, Inc.; hydronic radiant floor heating systems and hydronic snow and ice melting systems.
This section is based on the products of MrPex Systems, Inc., which is located at:
2613 87th Court W.
Northfield, MN 55057
Toll Free: 800-716-3406
Phone: 952-652-2472
Fax: 763-856-8121
Email: info@mrpexsystems.com
Web Site: www.mrpexsystems.com
MrPEX® Systems is one of the leading radiant floor heating and domestic hot and cold water systems suppliers in North American marketplace. Our core product, MrPEX® Tubing, is considerably more flexible, kink-resistant and able to hold more pressure than any other PEX Tubing on the market today!
Combined with our highly technical knowledge and dedication to customer service it's no wonder MrPEX® Systems is one of the fastest growing radiant system suppliers in North America.
 
          PART 1GENERAL
 
          1.1SECTION INCLUDES
 
          A.Hydronic radiant floor heating systems.
 
          B.Hydronic snow and ice melting systems.
 
          1.2RELATED SECTIONS
          ** NOTE TO SPECIFIER ** Delete sections below not relevant to this project; add others as required.
 
          A.Section 03300 - Cast-In-Place Concrete.
 
          B.Section 06100 - Rough Carpentry.
 
          C.Section 06400 - Interior Finish Carpentry.
 
          D.Section 07210 - Insulation.
 
          E.Section 09300 - Tiling.
 
          F.Section 09627 - Laminate Flooring.
 
          G.Section 09640 - Wood Flooring.
 
          H.Section 09680 - Carpeting.
 
          I.Section 15050 - Basic Mechanical Methods and Materials.
 
          1.3REFERENCES
          ** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
 
          A.ASTM International (ASTM):
          1.ASTM F 876 - Standard Specification for Crosslinked Polyethylene (PEX) Tubing.
          2.ASTM F 877 - Standard Specification for Crosslinked Polyethylene (PEX) Plastic Hot- and Cold-Water Distribution Systems.
          3.ASTM F 1281-2005 - Standard Specification for Crosslinked Polyethylene/Aluminum/ Crosslinked Polyethylene (PEX AL PEX) Pressure Pipe.
          4.ASTM F 1807 - Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing.
          5.ASTM F 1960 - Standard Specification for Cold Expansion Fittings with PEX Reinforcing Rings for Use with Cross-linked Polyethylene (PEX) Tubing.
          6.ASTM F 2080 - Standard Specification for Cold-Expansion Fittings With Metal Compression-Sleeves for Cross-Linked Polyethylene (PEX) Pipe.
 
          B.Canadian Standards Association (CSA): CAN/CSA B137.5 - Cross-Linked Polyethylene (PEX) Tubing Systems for Pressure Applications.
 
          C.German Institute for Standards/Deutsches Institut fur Normung (DIN): DIN 4726 - Pipelines of Plastic Materials Used in Warm Water Floor Heating Systems; General Requirements.
 
          D.International Code Council (ICC): PMG Listing 1053.
 
          E.Plastics Pipe Institute (PPI):
          1.Technical Report TR-3 Policies and Procedures for Developing Recommended Hydrostatic Design Stresses for Thermoplastic Pipe Materials.
          2.Technical Report TR-4 Recommended Hydrostatic Strengths and Design Stresses for Thermoplastic Piping and Fitting Compounds.
 
          F.Society of the Plastics Industry (SPI).
 
          1.4SUBMITTALS
 
          A.Submit under provisions of Section 01300.
 
          B.Product Data: Manufacturer's data sheets for each assembly specified, including but not limited to:
          1.Performance characteristics.
          2.Preparation instructions and recommendations.
          3.Storage and handling requirements and recommendations.
          4.Installation Instructions.
 
          C.Shop Drawings: Provide shop drawings showing details, including but not limited to tubing layouts, manifold locations, zoning requirements, manifold schedules, interface of the work of this section with the work of adjacent trades and indicating dimensions, tolerances and details required for installation of systems.
 
          D.System Schematics: Provide mechanical schematic indicating heat source, mechanical piping and accessories from heat source to manifolds, circulators, water tempering and zone controls; indicate supply water temperatures and flow rates to manifolds.
 
          E.Compliance Certificates: Manufacturer's documentation showing products and systems are in compliance with specified performance requirements including but not limited to ASTM F 877 and DIN 4726 (oxygen diffusion); test reports from recognized independent testing laboratories.
 
          F.Heat Loss Analysis: Detailed heat loss for the structure, and calculation output, surface temperature, water temperature and tubing/manifold pressure drops, calculated using software designed for radiant systems.
 
          G.Closeout Submittals:
          1.Warranty documentation.
          2.Operation and maintenance data.
          3.Final as-built tubing layout Drawing.
          ** NOTE TO SPECIFIER ** Delete if field inspections are not specified in Part 1 article ' QUALITY ASSURANCE' and Part 3 article ' INSTALLATION - GENERAL.'
          4.Manufacturer's field inspection reports.
          ** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected.
 
          H.Selection Samples: For each assembly type, two complete sets of samples representing manufacturer's full range of available piping types.
 
          I.Verification Samples: For each finish product specified, two samples representing actual piping types specified.
 
          1.5QUALITY ASSURANCE
 
          A.Single Source Requirements: To the greatest extent possible, provide hydronic radiant flooring systems and ancillary products specified in this section from a single manufacturer.
 
          B.Installer Qualifications: Successfully engaged in installation of systems of similar size and complexity for at least 2 years.
          ** NOTE TO SPECIFIER ** Delete if field inspections are not specified in Part 1 article ' SUBMITTALS' and Part 3 article ' INSTALLATION - GENERAL.'
 
          C.Manufacturer Requirements: Appoint a representative to visit and inspection site.
 
          1.6DELIVERY, STORAGE AND HANDLING
 
          A.Deliver materials in manufacturer's original, unopened, undamaged containers and packaging with identification labels identifying product name and manufacturer intact.
 
          B.Deliver, store and handle materials and products in strict compliance with manufacturer's instructions and recommendations and industry standards. Protect from damage.
          1.Prevent dirt or foreign materials from entering tubing.
          2.Do not expose tubing to direct sunlight for more than 30 days; cover tubing exposed to direct sunlight if construction delays occur.
 
          1.7PROJECT CONDITIONS
 
          A.Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's recommended limits.
 
          1.8SEQUENCING AND SCHEDULING
 
          A.Conference: Convene a pre-installation conference to establish procedures to maintain optimum working conditions and to coordinate the work of this section work with related and adjacent work.
          1.Comply with manufacturer's ordering instructions and lead-time requirements to avoid construction delays.
          2.Verify project requirements, substrate conditions, floor coverings, manufacturer's installation instructions and warranty requirements.
          3.Review project construction timeline to ensure compliance or discuss modifications.
          ** NOTE TO SPECIFIER ** Delete the following subparagraph and corresponding options in Part 1 articles "SUBMITTALS' and ' QUALITY ASSURANCE' and Part 3 article ' INSTALLATION - GENERAL.'
          4.Establish the frequency and construction phase during which the project engineer intends for site visits and inspections by the manufacturer's representative.
 
          1.9WARRANTY
 
          A.Manufacturer's Warranty: Standard transferable limited warranty against defects in materials and manufacturing.
          1.Warranty Period for Tubing: 25 years.
          2.Warranty Period for Manifolds and Fittings: 2 years.
          3.Warranty Period for Controls and Electrical Components: 2 years.
 
          PART 2PRODUCTS
 
          2.1MANUFACTURERS
 
          A.Acceptable Manufacturer: Mr PEX Systems, Inc., which is located at: 2613 87th Court W. ; Northfield, MN 55057; Toll Free Tel: 800-716-3406; Tel: 952-652-2472; Fax: 952-652-2378; Email: request info; Web: www.mrpexsystems.com
          ** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
 
          B.Substitutions: Not permitted.
 
          C.Requests for substitutions will be considered in accordance with provisions of Section 01600.
 
          2.2HYDRONIC RADIANT FLOOR HEATING SYSTEMS
 
          A.Hydronic Radiant Floor Heating Systems: Components and accessories as manufactured by MrPex Systems, Inc.
          1.Compliance: ICC ES PMG 1053.
          a.Pressure Ratings: PPI TR-3, as listed in PPI TR-4.
          1)Hydrostatic Rating: 200 degrees F (93 degrees C) at 80 psi (551 kPa).
          2)Hydrostatic Rating: 180 degrees F (82 degrees C) at 100 psi (689 kPa).
          3)Hydrostatic Rating: 73.4 degrees F (23 degrees C) at 160 psi (1102 kPa).
          2.Thermostat: MrPEX Radiant Thermostat.
          3.Glycol and Water Solution: Inhibited propylene glycol; ethylene glycol is not acceptable.
          ** NOTE TO SPECIFIER ** Manufacturer recommends premixed glycol and water solutions. Delete options for type not required.
          a.Type: As indicated on Drawings.
          b.Type: Premixed, concentrations in accordance with instruction of tubing, manifold and boiler manufacturers.
          c.Type: Site-mixed. concentrations in accordance with instruction of tubing, manifold and boiler manufacturers
          ** NOTE TO SPECIFIER ** For slab-on-grade installation only. Delete if not required.
          4.Installation Accessory: MrPEX Foam Staples.
 
          B.Through-Penetration Firestopping: Rated through-penetration assemblies as scheduled or indicated on Drawings.
 
          C.Tubing:
          ** NOTE TO SPECIFIER ** Delete options for tubing type not required.
          1.Tubing Type: As scheduled or indicated on Drawings.
          2.Tubing Type: PEX-a barrier tubing.
          NOTE TO SPECIFIER ** A Slinky is suspended on elastic threads around itself. There is no reinforcement along its length. Thus making it free to move and remarkably flexible. The shape remains round. It never kinks, although the bending radius is minimal. Similarly, PEX molecular chains extend around the tubing like the Slinky® string circles around itself. This makes Mr. PEX Tubing extremely flexible and kink-resistant. The molecular chain is aligned to resist stress around its perimeter. It is unusually strong, resisting inside pressure. The molecular orientation is achieved during extrusion which is a very unique process. Crosslinking occurs simultaneously with the orientation. Peroxide crosslinking guarantees optimal Tubing properties.
          a.Compliance: ASTM F 876 and ASTM F 877 Pex pipes.
          b.ICC PMG P1053.
          c.Oxygen Barrier meets DIN 4726.
          d.Rated PPI: 73.4 degree F: 160 PSI; 180 degree F: 100 PSI; 200 degree F: 80 PSI.
          e.Certified by NSF (NSF-rfh).
          f.CSA B137.5
          3.Tubing Type: PEX-AL-PEX tubing.
          ** NOTE TO SPECIFIER ** MrPEX® Composite Pipe consists of five layers, inside and outside layers are made of Cross-Linked Polyethylene (PEX) tightly bonded with melt adhesive to the mid-layer of aluminum core which is longitudinally welded in an overlap. All layers are extruded in one step. The middle layer of aluminum is 100 percent gas/oxygen tight, giving it advantages of both metal and plastic pipe, but not the disadvantages. The Pipe conforms to ASTM F 1281, is pressure rated by PPI and certified by NSF. Since the thermal elongation and contraction is 9 times less than for PEX, noise generation after installation is virtually eliminated.
          a.Compliance: ASTM F 1281-2005 Pex-Al-Pex Pipes.
          b.CSA B137.10.
          c.NSF (NSF pw & NSF rfh).
          d.Complies with NSF/ANSI Standard 14 and 61 health effects requirements.
          e.The tubing is in compliance with chlorine resistance test method ASTM F 2023 and carries cNSF and cNSFus mark.
          f.Rated PPI: 73.4 degree F: 200 PSI; 180 degree F: 125 PSI; 200 degree F: 100 PSI.
          4.Materials: Crosslinked polyethylene (PEX) manufactured by PEX-a process.
          5.Pressure Ratings: Standard Grade hydrostatic design and pressure ratings as issued by the Plastics Pipe Institute (PPI), div. of the Society of the Plastics Industry (SPI).
          6.Minimum Bend Radius (Cold Bending): No less than four times the outside diameter. Use the PEX tubing manufacturer's bend supports if radius is less than stated.
          7.Barrier Tubing Type: MrPEX Barrier PEX Tubing.
          a.Oxygen Diffusion Rate: Oxygen diffusion barrier does not exceed an oxygen diffusion rate of 0.10 grams per cubic meter per day at 104 degrees F (40 degrees C) water temperature in accordance with German DIN 4726.
          b.Tubing Size (ASTM F 876):
          ** NOTE TO SPECIFIER ** Delete options for nominal inside diameter not required.
          1)Nominal Inside Diameter: As scheduled or indicated on Drawings.
          2)Nominal Inside Diameter: 3/8 inch (9.53 mm).
          3)Nominal Inside Diameter: 1/2 inch (12.7 mm).
          4)Nominal Inside Diameter: 5/8 inch (15.88 mm).
          5)Nominal Inside Diameter: 3/4 inch (19.05 mm).
          6)Nominal Inside Diameter: 1 inch (25.4 mm).
          ** NOTE TO SPECIFIER ** Manifolds are sold separately, so user may select own combination of Supply, Returns, and Basics. Manifold branches are Eurokonus (EK) 20 - compatible with many fitting makes, including our fittings for both PEX tubing and PEX-AL-PEX Tubing. all Manifold Trunk parts (transitions to Copper, NPT, PEX, PEX-AL-PEX, Blinds, Fill/Drain, etc.) come with an O-ring seal. Branch Blind Caps are available to cap off unused branches (for future hook up). Delete if not required.
 
          D.Manifolds: MrPEX Manifolds; residential and light commercial.
          ** NOTE TO SPECIFIER ** Delete options for materials not required.
          1.Materials: As scheduled or indicated on Drawings..
          2.Materials: Brass.
          3.Materials: Stainless steel.
          4.Size: 1-1/4-inch manifolds offered by tubing manufacturer.
          5.Use manifold mounting brackets offered by the PEX tubing manufacturer.
          6.Description: Provide individual flow control for manifold loops through valve actuators; manual visual flow balancing capability within the manifold body for balancing unequal loop lengths across manifolds.
          7.Compatibility: Support 3/8 inch to 5/8 inch tubing.
          8.System Design: Locate manifolds such that air can be manually vented from system from each manifold.
          ** NOTE TO SPECIFIER ** Manifolds are sold separately, so user may select own combination of Supply, Returns, and Basics. Manifold branches are Eurokonus (EK) 20 - compatible with many fitting makes, including our fittings for both PEX tubing and PEX-AL-PEX Tubing. all Manifold Trunk parts (transitions to Copper, NPT, PEX, PEX-AL-PEX, Blinds, Fill/Drain, etc.) come with an O-ring seal. Branch Blind Caps are available to cap off unused branches (for future hook up). Delete if not required.
 
          E.Manifolds: MrPEX Manifolds; commercial.
          1.Description: For use with an isolation valve or a combination isolation and balancing valve on each outlet.
          ** NOTE TO SPECIFIER ** Delete options for type not required.
          2.Type: As scheduled or indicated on Drawings.
          3.Type: 1-1/2 inch stainless steel manifolds.
          4.Type: 1-1/2 or 2 inch copper manifolds manufactured from Type L copper material, offered by tubing manufacturer; support 5/8 inch or 3/4 inch tubing.
          5.System Design: Wall-hung or boxed applications.
          6.End Caps: Offers tapping for 1/8 inch FNPT and 1/4 inch FNPT for vent and drain.
          ** NOTE TO SPECIFIER ** Delete options for configuration not required.
          7.Configuration: As scheduled or indicated on Drawings.
          8.Configuration: Reverse-return, to ensure self-balancing.
          9.Configuration: Direct-return configuration
          ** NOTE TO SPECIFIER ** MrPEX® can supply you with virtually any other radiant floor component needed including mixing valves, controls, heat transfer plates, fasteners and accessories.
 
          F.Fittings: MrPEX Fittings.
          1.Compliance: ASTM F 877 and CAN/CSA B137.5 requirements.
          2.Compression Fittings: MrPEX EK20, or other fittings as approved by manufacturer.
          a.Fitting assembly manufactured from nickel-plated brass material.
          b.Components: Barbed insert, compression ring and compression nut, o-ring
          c.Compatible fittings ASTM F 1807, ASTM F 1960, and ASTM F 2080.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          G.Supply and Return Piping to the Manifolds: For above ground piping.
          1.Properly size supply and return distribution piping for the given volume and velocities required at system design.
          2.Use manufacturer approved distribution piping material (such as MrPEX Barrier PEX, type M copper) for supply fluid temperatures in systems with ferrous components.
          3.Use fittings compatible with piping material. Fittings must transition from distribution piping to system manifolds.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          H.Supply and Return Piping to the Manifolds: For below ground piping.
          1.Properly size supply and return distribution piping for the given volume and velocities required at system design.
          2.Use manufacturer approved distribution piping material (such as MrPEX Barrier PEX, type M copper) for supply fluid temperatures in systems with ferrous components.
          3.Use fittings compatible with piping material. Fittings must transition from distribution piping to system manifolds.
 
          I.Room Temperature Controls: MrPex Radiant Thermostats.
          1.Zone Controllers: MrPEX Zone Controllers; supplies 24VAC to the thermostats and actuators. Built-in end-switch and pump output relays activate relays or controls.
          2.Description: Operate within a 1 degree F differential temperature incorporating pulse-width modulation action; digital display in each room or zone as required.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          J.Supply Water Temperature Control: Single-temperature with floating action.
          1.Outdoor Reset Controller: Smart Comfort 110; controls tempering of supply water temperature to the radiant floor panel via a three-way or four-way valve.
          a.Install the outdoor sensor on the north face of the building out of direct sunlight.
 
          2.3HYDRONIC SNOW AND ICE MELTING SYSTEMS
 
          A.Hydronic Snow and Ice Melting Systems: Components and accessories as manufactured by MrPex Systems, Inc.
          1.Compliance: ICC ES PMG 1053.
          a.Pressure Ratings: PPI TR-3, as listed in PPI TR-4.
          1)Hydrostatic Rating: 200 degrees F (93 degrees C) at 80 psi (551 kPa).
          2)Hydrostatic Rating: 180 degrees F (82 degrees C) at 100 psi (689 kPa).
          3)Hydrostatic Rating: 73.4 degrees F (23 degrees C) at 160 psi (1102 kPa).
          2.Snowmelt Controls:
          a.MrPex Automatic Snow Melt Control.
          b.MrPex Snowmelt Moisture and Temperature Sensor.
          c.MrPex Mounting Socket for Snow Melt Moisture and Temperature Sensor.
          3.Glycol and Water Solution: Inhibited propylene glycol; ethylene glycol is not acceptable.
          ** NOTE TO SPECIFIER ** Manufacturer recommends premixed glycol and water solutions. Delete options for type not required.
          a.Type: As indicated on Drawings.
          b.Type: Premixed, concentrations in accordance with instruction of tubing, manifold and boiler manufacturers.
          c.Type: Site-mixed. concentrations in accordance with instruction of tubing, manifold and boiler manufacturers.
          ** NOTE TO SPECIFIER ** For slab-on-grade installation only. Delete if not required.
          4.Installation Accessory: MrPEX Foam Staples.
 
          B.Through-Penetration Firestopping: Rated through-penetration assemblies as scheduled or indicated on Drawings.
 
          C.Tubing:
          ** NOTE TO SPECIFIER ** Delete options for tubing type not required.
          1.Tubing Type: As scheduled or indicated on Drawings.
          NOTE TO SPECIFIER ** A Slinky is suspended on elastic threads around itself. There is no reinforcement along its length. Thus making it free to move and remarkably flexible. The shape remains round. It never kinks, although the bending radius is minimal. Similarly, PEX molecular chains extend around the tubing like the Slinky® string circles around itself. This makes Mr. PEX Tubing extremely flexible and kink-resistant. The molecular chain is aligned to resist stress around its perimeter. It is unusually strong, resisting inside pressure. The molecular orientation is achieved during extrusion which is a very unique process. Crosslinking occurs simultaneously with the orientation. Peroxide crosslinking guarantees optimal Tubing properties.
          a.Compliance: ASTM F 876 and ASTM F 877 Pex pipes.
          b.ICC PMG P1053.
          c.Oxygen Barrier meets DIN 4726.
          d.Rated PPI: 73.4 degree F: 160 PSI; 180 degree F: 100 PSI; 200 degree F: 80 PSI.
          e.Certified by NSF (NSF-rfh).
          f.CSA B137.5
          2.Tubing Type: PEX-AL-PEX tubing.
          ** NOTE TO SPECIFIER ** MrPEX® Composite Pipe consists of five layers, inside and outside layers are made of Cross-Linked Polyethylene (PEX) tightly bonded with melt adhesive to the mid-layer of aluminum core which is longitudinally welded in an overlap. All layers are extruded in one step. The middle layer of aluminum is 100 percent gas/oxygen tight, giving it advantages of both metal and plastic pipe, but not the disadvantages. The Pipe conforms to ASTM F 1281, is pressure rated by PPI and certified by NSF. Since the thermal elongation and contraction is 9 times less than for PEX, noise generation after installation is virtually eliminated.
          a.Compliance: ASTM F 1281-2005 Pex-Al-Pex Pipes.
          b.CSA B137.10.
          c.NSF (NSF pw & NSF rfh).
          d.Complies with NSF/ANSI Standard 14 and 61 health effects requirements.
          e.The tubing is in compliance with chlorine resistance test method ASTM F 2023 and carries cNSF and cNSFus mark.
          f.Rated PPI: 73.4 degree F: 200 PSI; 180 degree F: 125 PSI; 200 degree F: 100 PSI.
          3.Materials: Crosslinked polyethylene (PEX) manufactured by PEX-a process.
          4.Pressure Ratings: Standard Grade hydrostatic design and pressure ratings as issued by the Plastics Pipe Institute (PPI), div. of the Society of the Plastics Industry (SPI).
          5.Minimum Bend Radius (Cold Bending): No less than four times the outside diameter. Use the PEX tubing manufacturer's bend supports if radius is less than stated.
          6.Barrier Tubing Type: MrPEX Barrier PEX Tubing.
          a.Oxygen Diffusion Rate: Oxygen diffusion barrier does not exceed an oxygen diffusion rate of 0.10 grams per cubic meter per day at 104 degrees F (40 degrees C) water temperature in accordance with German DIN 4726.
          b.Tubing Size (ASTM F 876):
          ** NOTE TO SPECIFIER ** Delete options for nominal inside diameter not required.
          1)Nominal Inside Diameter: As scheduled or indicated on Drawings.
          2)Nominal Inside Diameter: 3/8 inch (9.53 mm).
          3)Nominal Inside Diameter: 1/2 inch (12.7 mm).
          4)Nominal Inside Diameter: 5/8 inch (15.88 mm).
          5)Nominal Inside Diameter: 3/4 inch (19.05 mm).
          6)Nominal Inside Diameter: 1 inch (25.4 mm).
          ** NOTE TO SPECIFIER ** Manifolds are sold separately, so user may select own combination of Supply, Returns, and Basics. Manifold branches are Eurokonus (EK) 20 - compatible with many fitting makes, including our fittings for both PEX tubing and PEX-AL-PEX Tubing. all Manifold Trunk parts (transitions to Copper, NPT, PEX, PEX-AL-PEX, Blinds, Fill/Drain, etc.) come with an O-ring seal. Branch Blind Caps are available to cap off unused branches (for future hook up). Delete if not required.
 
          D.Manifolds: MrPEX Manifolds; residential and light commercial.
          ** NOTE TO SPECIFIER ** Delete options for materials not required.
          1.Materials: As scheduled or indicated on Drawings..
          2.Materials: Brass.
          3.Materials: Stainless steel.
          4.Size: 1-1/4-inch manifolds offered by tubing manufacturer.
          5.Use manifold mounting brackets offered by the PEX tubing manufacturer.
          6.Description: Provide individual flow control for manifold loops through valve actuators; manual visual flow balancing capability within the manifold body for balancing unequal loop lengths across manifolds.
          7.Compatibility: Support 3/8 inch to 5/8 inch tubing.
          8.System Design: Locate manifolds such that air can be manually vented from system from each manifold.
          ** NOTE TO SPECIFIER ** Manifolds are sold separately, so user may select own combination of Supply, Returns, and Basics. Manifold branches are Eurokonus (EK) 20 - compatible with many fitting makes, including our fittings for both PEX tubing and PEX-AL-PEX Tubing. all Manifold Trunk parts (transitions to Copper, NPT, PEX, PEX-AL-PEX, Blinds, Fill/Drain, etc.) come with an O-ring seal. Branch Blind Caps are available to cap off unused branches (for future hook up). Delete if not required.
 
          E.Manifolds: MrPEX Manifolds; commercial.
          1.Description: For use with an isolation valve or a combination isolation and balancing valve on each outlet.
          ** NOTE TO SPECIFIER ** Delete options for type not required.
          2.Type: As scheduled or indicated on Drawings.
          3.Type: 1-1/2 inch stainless steel manifolds.
          4.Type: 1-1/2 or 2 inch copper manifolds manufactured from Type L copper material, offered by tubing manufacturer; support 5/8 inch or 3/4 inch tubing.
          5.System Design: Wall-hung or boxed applications.
          6.End Caps: Offers tapping for 1/8 inch FNPT and 1/4 inch FNPT for vent and drain.
          ** NOTE TO SPECIFIER ** Delete options for configuration not required.
          7.Configuration: As scheduled or indicated on Drawings.
          8.Configuration: Reverse-return, to ensure self-balancing.
          9.Configuration: Direct-return configuration
          ** NOTE TO SPECIFIER ** MrPEX® can supply you with virtually any other radiant floor component needed including mixing valves, controls, heat transfer plates, fasteners and accessories.
 
          F.Fittings: MrPEX Fittings.
          1.Compliance: ASTM F 877 and CAN/CSA B137.5 requirements.
          2.Compression Fittings: MrPEX EK20, or other fittings as approved by manufacturer.
          a.Fitting assembly manufactured from nickel-plated brass material.
          b.Components: Barbed insert, compression ring and compression nut, o-ring.
          c.Compatible fittings ASTM F 1807, ASTM F 1960, and ASTM F 2080.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          G.Supply and Return Piping to the Manifolds: For above ground piping.
          1.Properly size supply and return distribution piping for the given volume and velocities required at system design.
          2.Use manufacturer approved distribution piping material (such as MrPEX Barrier PEX, type M copper) for supply fluid temperatures in systems with ferrous components.
          3.Use fittings compatible with piping material. Fittings must transition from distribution piping to system manifolds.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          H.Supply and Return Piping to the Manifolds: For below ground piping.
          1.Properly size supply and return distribution piping for the given volume and velocities required at system design.
          2.Use manufacturer approved distribution piping material (such as MrPEX Barrier PEX, type M copper) for supply fluid temperatures in systems with ferrous components.
          3.Use fittings compatible with piping material. Fittings must transition from distribution piping to system manifolds.
 
          I.Snowmelt Controls:
          1.MrPex Automatic Snow Melt Control.
          2.MrPex Snowmelt Moisture and Temperature Sensor.
          3.MrPex Mounting Socket for Snow Melt Moisture and Temperature Sensor.
 
          PART 3EXECUTION
 
          3.1EXAMINATION AND PREPARATION
 
          A.Prepare substrates using the methods recommended by the manufacturer for achieving best result for the substrates under project conditions.
 
          B.Do not proceed with installation until substrates have been prepared using the methods recommended by the manufacturer and deviations from manufacturer's recommended tolerances are corrected. Commencement of installation constitutes acceptance of conditions.
 
          C.If preparation is the responsibility of another installer, notify Architect in writing of deviations from manufacturer's recommended installation tolerances and conditions.
 
          3.2INSTALLATION - GENERAL
 
          A.Install products in accordance with manufacturer's instructions and recommendations.
          1.Testing: Prior to covering hydronic radiant floor heating systems perform a system pressure test and inspect for leaks; test electrical controls.
          2.System circulators must operate continuously for a minimum of 30 days after the system is filled to ensure glycol and water do not separate in static system.
          ** NOTE TO SPECIFIER ** Delete if not required.
          3.For Direct-Return Configuration: Install and balance flow setters on the return leg of each manifold to the mains.
          ** NOTE TO SPECIFIER ** Delete if not required.
          4.Multiple-Zone Control: Install loops per zone and install individual valve actuators on respective loops at the manifold.
          ** NOTE TO SPECIFIER ** Delete if field inspections are not specified in Part 1 article ' QUALITY ASSURANCE' and Part 3 article ' INSTALLATION - GENERAL.'
 
          B.Site Visits and Inspections: By manufacturer's representative to visit and inspection site; according to schedule establish in pre-installation meeting.
          ** NOTE TO SPECIFIER ** Delete if site-mixed solutions specified in Part 2 of this section. Manufacturer recommends premixed glycol and water solutions.
 
          C.Glycol and Water Solution: Premixed.
          ** NOTE TO SPECIFIER ** Delete if premixed solutions specified in Part 2 of this section. manufacturer recommends premixed glycol and water solutions
 
          D.Glycol and Water Solution:
          1.Site-mixed, inhibited propylene glycol; ethylene glycol is not acceptable.
          2.Mixed before entering system; to concentrations in accordance with instruction of tubing, manifold and boiler manufacturers.
 
          E.Through-Penetration Firestopping: Ensure compatibility of 1- and 2-hour rated through-penetration assemblies.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.3INSTALLATION - SLAB-ON-GRADE
 
          A.Installation: Slab-on-grade.
          1.Fasten tubing to flat mesh or reinforcing bars in accordance with the manufacturer's installation recommendations.
          2.Use closer tubing on-center distances along exterior walls. Increase tubing on-center distances as the installation moves away from the exterior wall.
          a.Do not exceed 12 inches (305 mm) on center for residential use applications.
          b.Do not install tubing within 6 inches (152 mm) of walls.
          3.If the design requires under-slab insulation, the structural engineer determines the vertical compressive strength of the high-density extruded board insulation. The radiant floor design determines the required insulation resistance value (R-value).
          4.When using high-density board insulation, staple tubing to insulation board with manufacturer's foam staples.
          5.Use edge insulation when the heated panel directly contacts an exterior wall or panel.
          6.Install tubing at a consistent depth below the surface elevation as determined by the project engineer. Ensure sufficient clearance to avoid control joint cuts.
          7.In areas where tubing must cross metal expansion joints in the concrete, ensure the tubing passes below the joints. Depending on the manufacturer's and structural engineer's recommendation, fibrous expansion joints may tolerate penetration.
          8.For tubing that exits the slab in a 90-degree bend, use bend supports.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.4INSTALLATION - PRE-CAST PLANK CONSTRUCTION WITH CAP POUR
 
          A.Installation: Pre-cast plank construction with a cap pour.
          1.Fasten the tubing to flat wire mesh or reinforcing bar, or snap into PEX rails in accordance with the manufacturer's installation recommendations.
          2.Use closer tubing on-center distances along exterior walls. Increase tubing on-center distances as the installation moves away from the exterior wall.
          a.Do not exceed 12 inches (305 mm) on center for residential use applications.
          b.Do not exceed 9 inches (229 mm) on center for tile or linoleum covered floors.
          c.Do not install tubing within 6 inches (152 mm) of walls.
          d.Refer to the submitted radiant floor design layout.
          3.If the design requires under-slab insulation, the structural engineer determines the vertical compressive strength of the high-density extruded board insulation. The radiant floor design determines the required insulation resistance value (R-value).
          4.Use edge insulation when the heated panel directly contacts an exterior wall or panel.
          5.Install tubing at a consistent depth below the surface elevation as determined by the project engineer. Ensure sufficient clearance to avoid control joint cuts.
          6.Depending on the manufacturer's and structural engineer's recommendation, fibrous expansion joints may tolerate penetration.
          7.For tubing that exits the slab in a 90-degree bend, use bend supports.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.5INSTALLATION - WOOD FLOOR CONSTRUCTION WITH LIGHTWEIGHT GYPSUM POURED UNDERLAYMENT
 
          A.Installation: Wood floor construction with a lightweight gypsum poured underlayment.
          1.Staple tubing to the wood subfloor in accordance with the manufacturer's installation recommendations. The attachment method should not cause abrasions on the tubing.
          2.Use closer tubing on-center distances along exterior walls. Increase tubing on-center distances as the installation moves away from the exterior wall.
          a.Do not exceed 9 inches (229 mm) on center for types of floor coverings.
          b.Do not install tubing within 6 inches (152 mm) of walls.
          c.Refer to the submitted radiant floor design layout.
          3.Ensure the depth of the lightweight pour is a minimum of 3/4 inch (19 mm) over the outside dimension of the PEX tubing.
          4.Install reinforcing mesh within the pour for finished flooring of tile or linoleum.
          5.Install wood sleepers along the room perimeter and between the tubing to provide a nailing surface for finished wood floors or carpet tack strips as required.
          6.Use lightweight gypsum concrete material for radiant floor heating applications.
          7.Allow lightweight gypsum concrete pour to cure naturally in accordance with the applicator's instructions. Once cured, seal the surface of the poured floor to protect from moisture.
          8.Install insulation in the joist cavity below the floor in accordance with the submitted radiant floor design.
          9.Install edge insulation if the heated panel directly contacts an exterior wall or panel.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.6INSTALLATION - WOOD FLOOR CONSTRUCTION WITH JOIST HEATING
 
          A.Installation: Wood floor construction with joist heating, tubing suspended in the joist bay.
          1.Install tubing within the joist cavity in accordance with the PEX tubing manufacturer's recommendations. The attachment method should not cause abrasions to the tubing.
          2.Do not exceed 8 inches (203 mm) on center.
          3.Do not allow tubing within the joist cavity to contact the wood subfloor.
          4.Refer to the PEX tubing manufacturer's installation procedures on proper joist drilling.
          5.Install insulation in the lower portion of the joist cavity. Allow an air gap of 2 inches to 3 inches (51 mm to 76 mm) between the wood subfloor and the top of the insulation.
          6.Use the recommended amount of insulation in the joist cavity below the floor in accordance with the submitted radiant floor design.
          a.To compute insulation amount, the manufacturer recommends as a guideline a minimum of 5:1 ratio in R-value of the joist insulation to upward resistance.
          7.Use edge insulation if the heated panel directly contacts an exterior wall or panel.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.7INSTALLATION - WOOD FLOOR CONSTRUCTION WITH C-FIN PLATES
 
          A.Installation: Wood floor construction with C-fin plates.
          1.Attach C-Fin panels to wood subfloor in joist cavity according to manufacturer's recommendations.
          2.Do not exceed 8 inches (203mm) on center.
          3.Secure the C-Fin panels to the underside of the wood subfloor and then install the tubing into the C-Fin panel.
          4.Refer to manufacturer's procedures for proper joist drilling.
          5.Install insulation within the joist cavity snugly against the C-Fin panels. Do not allow any air gap between the wood subfloor and the top of the insulation.
          6.Use the recommended amount of insulation in the joist cavity below the floor in accordance with the submitted radiant floor design.
          a.To compute insulation amount, the manufacturer recommends as a guideline a minimum of 5:1 ratio in R-value of the joist insulation to upward resistance.
          7.Use edge insulation if the heated panel directly contacts an exterior wall or panel.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.8INSTALLATION - WOOD FLOOR CONSTRUCTION USING ALUMINUM HEAT EMISSION PLATES
 
          A.Installation: Wood floor construction using aluminum heat emission plates.
          1.Attach the aluminum heat emission plates to the wood subfloor in the joist cavity according to the PEX tubing manufacturer's recommendations.
          2.Do not exceed 8 inches (203mm) on center.
          3.Pull the tubing through the joist cavity. Install the aluminum plates over the tubing and secure to the wood subfloor.
          4.Refer to manufacturer's installation procedures about proper joist drilling.
          5.Install insulation within the joist cavity snugly against the aluminum panels. Do not allow any air gap between the wood subfloor and the top of the insulation.
          6.Use the recommended amount of insulation in the joist cavity below the floor in accordance with the submitted radiant floor design.
          a.To compute insulation amount, the manufacturer recommends as a guideline a minimum of 5:1 ratio in R-value of the joist insulation to upward resistance.
          7.Use edge insulation if the heated panel directly contacts an exterior wall or panel.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.9SNOWMELT INSTALLATION - SLAB ON GRADE OR BELOW GRADE
 
          A.Installation: Tubing embedded in a concrete slab poured on grade. Tubing is fastened to under slab insulation with plastic foam staples or tied to wire mesh or rebar. Comply with manufacturer's recommendations including the following:
          1.Install vapor barrier if required in accordance with approved submittals.
          2.Install foam insulation and tape seams
          3.Route the tubing along the supply path and attach it with foam staples, clips or ties to the wire mesh every 2- 3 feet on the straights as necessary and every 1 foot on the bends. Secure the tubing enough so that it does not float up to the surface during the slab pour.
          4.Embed top of tube in the slab at a minimum of 2 inches (50 mm) below the surface.
          5.Complete loop and test for proper operation.
          ** NOTE TO SPECIFIER ** Delete if not required.
 
          3.10SNOWMELT INSTALLATION - PAVERS ON GRADE
 
          A.Installation: Tubing embedded in a sand layer with pavers on top. Tubing is fastened to high density insulation with plastic foam staples or tied to wire mesh or rebar. Comply with manufacturer's recommendations including the following:
          1.Install vapor barrier if required in accordance with approved submittals.
          2.Install foam insulation and tape seams.
          3.Route the tubing along the supply path and attach it with foam staples, clips or ties to the wire mesh every 2- 3 feet on the straights as necessary and every 1 foot on the bends.
          4.Embed top of tube in the sand layer at a minimum of 2 inches (50 mm) below the surface.
          5.Complete loop and test for proper operation.
 
          3.11FIELD QUALITY CONTROL
 
          A.Site Tests: To ensure system integrity, pressure test the system before covering tubing in concrete or when other trades are working in the vicinity of the tubing. Test all electrical controls in accordance with respective installation manuals.
 
          3.12ADJUSTING
 
          A.Balancing Across the Manifold:
          1.Balance loops across manifolds for equal flow resistance based on actual loop lengths and total manifold flow; accomplished with flow control device installed on return piping leg from manifold when direct return piping is used for supply and return mains.
          2.Balancing is unnecessary when loop lengths across the manifold are within 3 percent of each other in length. Install supply and return piping to manifold in reverse-return configuration to ensure self-balancing.
 
          3.13DEMONSTRATION, TRAINING AND MAINTENANCE
 
          A.Demonstrate operation of hydronic radiant floor heating system to Owner or Owner's designated personnel.
 
          B.Maintenance: Advise Owner or Owner's representative about need to establish a maintenance program to monitor glycol solution effectiveness and type, concentration of glycol and water solution used.
 
          3.14CLEANING AND PROTECTION
 
          A.Clean installed products in accordance with manufacturer's instructions.
          1.Remove temporary coverings and protection of adjacent work areas.
          2.Remove construction debris from project site and legally dispose of debris.
 
          B.Touch-up, repair or replace damaged products before Substantial Completion.
 
          C.Protect installed products and finishes from damage during construction.
 
         
END OF SECTION