none RP-34-100 Installation Guide
Contents
1. be followed Heat Transfer Under Floor Applications e Minimizes the structural load requirements often associated with light weight concrete thin slab construction e Requires no floor height additions or removal of existing floor coverings to install Ideal for renovation projects e Make sure the tubing is installed in accordance with the design parameters If not the system may not function as desired e Requires the use of either a 1 25 4 mm or a 1 3 4 44 4 mm auger drill to install between joist bays depending on how tubing is installed Tube Spacing e Tubing is installed 8 203 2 mm on center to the underside of the subfloor with the use of heat transfer plates Method of Installation Extruded aluminum heat transfer plates are the primary fastening method of installing an under floor system Watts offers heat transfer plates designed to be used with 1 2 12 7 mm Heating PEX or Heating PEX AL PEX and are available in 4 1 2 m lengths The plates are installed 8 203 2 mm on center with 2 4 50 8 mm 101 6 mm gap between plates Bend Supports e Bend supports may be required if it is necessary to maintain certain bend radius or if connecting to a fitting immediately after a bend Pulling Tubing e Install the heat transfer plates before beginning to pull the tubing Make sure the end of the plate is de burred after cutting the plate to fit before installing the tubing e Meas2. Heat Transfer Plates for under floor installations only Under Floor Clips for under floor suspended installations only Watts Pressure Test Kit WIWATTS 815 Chestnut St No Andover MA 01845 ph 855 699 2887 fax 978 794 1848 radiant watts com In Canada 5435 North Service Road Burlington ON L7L 5H7 ph 888 208 8927 905 332 4090 fax 888 882 1979 905 332 7068 radiant watts com OM Heating PEX and Heating PEX AL PEX 1136 EDP 81015436 2011 Watts
3. PEX Manufactured to ASTM F1281 Tested and listed by the NSF International NSF 14 rfh Carries the UPC certification mark as approved by the International Association of Plumbing and Mechanical Officials Expansion Rate 0 156 100 10 F Note No special considerations required to account for thermal expansion Temperature Pressure 73 4 F 23 C 200 psi 1 38 MPa Min Support Min Support Minimum Fluid Capacity Vertical Horizontal Description ID OD Bend Radius gal 100 Distance Distance 0 500 0 630 0 806 0 984 59 23 6 397 Ea The bend radius for Heating PEX AL PEX is slightly tighter than Heating PEX but may still require some bends to be light bulb in shape It is important however to ensure the minimum bend radius is not exceeded as this will cause the tubing to kink This method allows for tighter on center spacing without compromising the tubing 180 F 82 22 125 psi 0 86 MPa 200 F 93 3 C 100 psi 0 69 MPa R3 Slab on grade Applications Slab e Acommon application consisting of any material or mass that encapsulates the radiant tubing such as concrete sand or soil Can be on or below grade Site Preparation A radiant slab should always Be placed on well drained base rock material e Be placed above an ample amount of crushed rock or gravel Heating PEX or Heating PEX AL PEX A radiant slab sh
4. be followed Thin Slab over Frame Floor Applications e Most thin slab applications are installed during the initial construction of a building due to the increased structural requirements to carry the added weight e Lightweight concrete products will increase the floor height by a minimum of 1 5 38 1 mm and the floor load anywhere between PEX AL PEX 12 to 18 Ibs sq ft 5 44 k to 8 16 k e The increase in load usually means a modification to the joist system and or other supports e Verify a floor s ability to withstand these loads prior to installing a Thin Slab Over Framed Cross Section lightweight concrete product Insulation Mimimum 1 1 2 Tube Spacing 38 1 mm Thin Slab e Residential thin slabs will use 6 152 4 mm 9 228 6 mm or 12 304 8 mm tube spacing with some perimeter banding Banding is any area where the tubing is installed with a tighter on center spacing Usually seen along exterior walls with higher than normal heat loss e Tubing is generally attached directly to the subfloor with the use of staples and or NailTites Fasteners The sub material the thin slab is installed over will determine how the tubing can be attached The most common sub material is a wooden subfloor e Staples spaced every 18 24 457 2 mm 609 6 mm on center Thin Slab Tube Spacing Use a staple gun set to 100 psi Thin slab Profile e important to maintain at least 3 4 1
5. insulation can be used the joist cavity e Install the insulation tight against the subfloor to minimize any convective losses that may be generated e The insulation should be a minimum of 3 1 2 88 9 mm or R 13 fiberglass batt when the radiant floor is installed over a heated space such as a basement 5 1 2 139 7 mm or R 19 batt or thicker depending on the climate should be used when the area below the radiant floor is unheated or exposed to the elements Thin Slab with Sleepers Wooden sleepers are sometimes installed within a thin slab application to allow for points of attachment for hardwood or other floor coverings Thin Slab Layout Example Manifold Location Heating PEX or Heating PEX AL PEX 12 ma 304 8 mm Heating PEX or Heating PEX AL PEX Wooden Sleeper Thin Slab with Sleepers Insulation Detail Please note In a thin slab application typically the tubing will be run through doorways and other openings rather than directly through walls ZONE 3 M 3 MANIFOLD 250 CIRCUIT LENGTHS 1 2 12 7 MM HEATING PEX 9 228 6 0 __ Slab 13 Note Local building or plumbing codes may require modifications to the information provided You are required to consult the local building and plumbing codes prior to installation If this information is not consistent with local building or plumbing codes the local codes should
6. or any needed parts freight prepaid In the case of field assembled manifolds Watts warrants the quality and serviceability of the individual components sold by Watts that the contractor incorporates in that manifold but Watts cannot warrant the complete manifold assembly or any field assembled connections That is the responsibility of the installing contractor To qualify for the above warranty you must do the following a Use good construction techniques to install our materials as specified in our current design and installation guidelines and technical notes This must include field pressure testing our materials before they are covered by concrete or otherwise made inaccessible b Install our materials according to all specific instructions furnished for your installation Install Heating PEX or Heating PEX AL PEX in a system that will not operate at temperatures exceeding ratings as marked on the tubing d Product must be installed in compliance with all applicable plumbing heating cooling and or mechanical codes Evidence of tampering mishandling neglect accidental damage freeze damage or unauthorized repairs that cause damage to Watts products will void any warranty coverage for these particular damages although it will not void warranty coverage for unrelated items Field repair joints and tubing to manifold connections are specifically excluded from the terms of this warranty Watts provides a complete radiant system o
7. the manifold 4 Install Tubing Pull one end of tubing off the unwinder and attach it to the first barb on the supply manifold Lay the tubing along the perimeter walls to the farthest point in the zone keeping the tubing 6 8 152 4 mm 203 2 mm from the edge of the slab This will help protect the tubing from possible penetrations later on when the final floor covering is installed Pay attention to the footage marking on the tubing and cut at the correct length Bend supports may be used to secure the tubing as it transitions from the thin slab to the wall In most thin slab applications built ins such as cabinets showers and walls are already in place before the thin slab is poured Tubing is generally run around these built ins Most structural code requirements restrict the amount of material that can be removed from a wall member It is advised to run the tubing through doorways or other openings whenever possible Supply Manifol Return Manifol Supply Manifold Return Manifold Manifold Location Thin Slab 20 8 6 3 T l 1 A 1 _ 5 16 8 5 1 m Thin Slab 11 5 Securing Tubing e When installing a thin slab over a subfloor standard staples are used e Make sure the staple gun is set to 100 psi
8. 1 C caution must be taken to allow the tubing to form a proper seal against the barb Apply the connection slowly to ensure the tubing material conforms to the barb Do not allow the fluid temperature to exceed 200 0 F 93 3 C at 80 psi 5 5 bar for Heating PEX 200 0 F 93 3 C at 100 psi 6 9 bar for Heating PEX AL PEX Do not allow the tubing to be exposed to sunlight or direct UV exposure for more than 30 days maximum If stored outside tubing must remain covered by a UV resistant material 4 Do not allow the tubing to come in contact with any of the following Petroleum based products Pipe sealants e Firewall sealants except those rated for use with Heating PEX or Heating PEX AL PEX Kerosene e Gasoline Fuel oils e Cutting oils Asphalt Contaminated soils or building materials Do not use if the tubing has visible gouges cuts cracks abrasions signs of physical damage or other defects 6 Do not use swimming pools or other systems that use high levels of chlorine 7 Use bend supports when necessary Heating PEX only 8 Do not kink If kinking occurs use a repair coupling 9 Do not expose tubing to rough terrain that may cause punctures cuts or other damage 10 Do not use tubing to transfer natural gas or any other unapproved substance Standards and Listings Heating PEX Heating PEX is manufactured to ASTM Internati
9. 6 9 bar and does not come in contact with the tubing Secure the tubing to the floor every 18 24 457 2 mm 609 6 mm e Try to keep all circuits within 10 of the same length 6 Inspection e Visually inspect each circuit of tubing for possible damage caused during installation If damage is found repair it using an approved Watts repair kit Wrap the repair with electrical tape do not use duct tape to protect the connection from the concrete 7 Pressure Test Pressure test the system with 50 100 psi 3 4 6 9 bar water or air for 24 hours Do not use water if exterior temperatures are near or below freezing 32 0 F 0 0 C conditions e Attach the pressure test kit to the manifold pair making certain the rubber o rings are properly seated before threading the unions together e Using the Schraeder valve for air or the water fill valves for liquid fill the system air or water but not both e Close the valve and fill Pressure test the system with 50 100 psi 3 4 6 9 bar water or air for 24 hours Note If the exterior temperatures are near or below freezing 32 0 F 0 0 C use air to pressure test If a fluid must be used use a 50 50 water glycol solution Failure to use glycol may result in frozen circuits The cool night air will usually cause less than a 10 psi drop in pressure as the water or air contracts from the cold Do not test over 100 psi 6 9 bat as this will damage the gauge on the test kit
10. 9 1 mm of thin slab material above the tubing More coverage may be necessary depending on the structural requirements of the slab structure Installation Steps Manifold locations final concrete thickness and zoning details are just a few items that can affect how a thin slab application is installed The following guidelines cover the most common installation conditions If a given situation is not covered here or if unexpected circumstances arise please contact Watts or a heating professional 1 Install Manifolds Locate where the manifolds are to be placed e With the use of Watts manifold brackets or manifold mounting enclosure secure the manifolds to the wall e Allowances may need to be made to allow the tubing to transfer through the wall base plate and into the thin slab e Follow local code guidelines when penetrating framing base plates PEX AL PEX Thin Slab Manifold Installation Detail 10 2 Determine Zone Boundaries Before tubing is installed visually inspect the area to determine the zone boundaries This helps determine where the first circuit is to be placed while identifying any obstacles 3 Confirm Tubing Requirements Measure the distance from the manifolds to the farthest point in the zone Make sure the minimum circuit length is at least twice this distance If not the tubing will not be long enough to reach the farthest point and still have enough length to return to
11. Heating PEX and Heating PEX AL PEX INSTALLATION MANUAL Contents General Handling amp Storage 3 General Installation Cautions 3 Standards and Listings 4 Slab on grade Applications 5 Site Preparation 5 Insulation Requirements 5 Type of Insulation 5 Post Concrete Pour 5 Control Joints and Saw Cuts 5 Tube Spacing 6 Fasteners 6 Slab Profile and General Details 6 Installation Steps 6 Thin Slab over Frame Floor Applications 10 Tube Spacing 10 Fasteners 10 Thin Slab Profile 10 Installation Steps 10 Insulation Requirements 13 Thin Slab with Sleepers 13 Thin Slab Layout Example 13 Under Floor Applications 14 Tube Spacing 14 Method of Installation 14 Bend Supports 14 Pulling Tubing 14 Installation Steps 14 Insulation Requirements 16 Under Floor Layout Example 16 Warranty 17 A WARNING You are required to thoroughly read all installation instructions and product safety information before beginning the installation of this product FAILURE TO COMPLY WITH PROPER INSTALLATION INSTRUCTIONS COULD RESULT IN PROPERTY DAMAGE and or PERSONAL INJURY Local building or plumbing codes may require modifications to the information provided You are required to consult the local building and plumbing codes prior to installation If this information is not consistent with local building or plumbing codes the local codes should be followed Watts is not r
12. Some minor pressure changes will occur due to the increased internal temperatures of the concrete as it begins the curing process Fluctuations in air temperature may also cause a slight change in the test pressure In most cases a 10 15 psi 0 7 1 0 bar drop in pressure over a twenty four hour period is not uncommon 8 The Thin Slab Pour To help detect possible damage caused during the concrete pour keep the system under pressure If damage is apparent locate the area in question and repair e Minor pressure changes will occur during the concrete curing process e Fluctuations in air temperature may cause slight changes in the test pressure In most cases 10 15 Ib 0 7 1 0 bar drop in pressure over a twenty four hour period is not uncommon e Heated water should not be circulated through the finished pour for a minimum of 28 days or until the concrete slab is fully cured 12 Heating PEX Heating PEX AL PEX 18 to 24 Thin Slab Loop Installation Detail Air Test Gauge Mounting Bracket Supply Manifold Compression Ring Compression Nut Heating PEX or Heating PEX AL PEX Vent Purge Return Manifold Drain Manifold Pressure Test Kit and Connection Detail Heating PEX Heating PEX AL PEX Thin Slab Cutaway Insulation Requirements e A standard paper faced
13. TED WARRANTY From Watts Watts warrants its Heating PEX cross linked polyethylene tubing Heating PEX AL PEX cross linked polyethylene aluminum cross linked polyethylene tubing fittings and factory manufactured manifolds to be free of defects in material and workmanship when used in hydronic heating cooling and snow melting systems This limited warranty for tubing is valid for a period of twenty five years from the date of manufacture This limited warranty for Watts manufactured manifolds and fittings expires two years from the date of manufacture All other Heating PEX and Heating PEX AL PEX accessories are warranted for one year after date of installation Watts obligation will be to repair or replace at its discretion any material proven to be defective when such material is cov ered under the following limited warranty In order to qualify for a labor allowance to repair or replace defective materials you must contact Watts in advance and receive a written authorization for this allowance Labor and freight expenses not authorized in writing in advance by Watts will not be compensated In the event of a system malfunction or leak caused by defective materials and not by incorrect installation procedures or damage from handling procedures jobsite conditions repair materials and a reasonable labor allowance will be allowed In the event of a leak occurring in a factory manifold you may contact Watts for a free replacement manifold
14. atures are near or below freezing 32 0 F 0 0 C conditions 4 Pull enough tubing to complete the last e Attach the pressure test kit to the manifold pair making certain bay using the loop in the previous bay as a the rubber o rings are properly seated before threading the buffer for extra tubing unions together e Using the Schraeder valve for air or the water fill valves for liquid fill the system air or water but not both e Close the valve and fill Pressure test the system with 50 100 psi 3 4 6 9 bar water or air for 24 hours Note If the exterior temperatures are near or below 0 freezing 32 0 F 0 0 C use air to pressure test If a fluid must be used use 50 50 water glycol F solution Failure to use glycol may result in frozen circuits The cool night air will usually cause less than 10 psi drop in pressure as the water or air LJ contracts from the cold 0 Do not test over 100 psi 6 9 bar as this will damage the gauge on the test kit Vent Purge Some minor pressure changes will occur due to Ret rn the increased internal temperatures of the concrete Manifold as it begins the curing process Fluctuations in air temperature may also cause a slight change in the test pressure In most cases a 10 15 psi 0 7 1 0 bar drop in pressure over a twenty four hour period is not uncommon Air Test Gauge Mounting Bracket Supply Manifold Comp
15. be and feed the free end through the adjacent joist Make small loop in each bay as you work towards the bay farthest from the manifold Pull enough tubing to fill the last bay If additional tubing is required pull it from the loop in the previous bay If too much was pulled push it back into the previous bay Care should be taken not to kink the tubing e Run the end of the tubing back to the manifold Drill a return hole 8 203 2 mm away from the first e Place the tubing into the fasteners Begin by attaching the run of tubing that is part of the return line going back to the manifold This side of the loop is fixed The other side is free to feed from the unwinder and previous bays in case extra tubing is required e Always remember to place the tubing so bends have the largest radius possible 1 Pull a loop of tubing in the first joist bay 2 Continue to the next bay pulling from the previous loop Tubing will need to be pulled from the unwinder as well to keep enough of a loop in the first bay 3 Repeat for each Inspection subsequent bay After all the circuits are installed take a few minutes to walk each circuit and visually inspect the tubing for possible damage caused during installation If damage is found repair it using an approved Watts repair kit Pressure Test Pressure test the system with 50 100 psi 3 4 6 9 bar water or air for 24 hours Do not use water if exterior temper
16. ctural engineer before using this or similar product Post Concrete Pour After the slab has been poured interior walls and other support structures still have to be installed typically secured directly to the slab Take some preliminary precautions to protect the tubing Sleeve lt Heating PEX or Heating PEX AL PEX LY lt lt ion Avoid wall locations place tubin rin th areas to be below any anchor that wil penetrate the sab ERE Pass Through 8 Control Joints and Saw Cuts Concrete slabs will expand and contract due to thermal changes To Joint Slab prevent damage to the slab expansion joints are used to control 48 lating PEX or expansion and contraction due to thermal changes In some cases saw cuts are used to control where cracking occurs Make sure the one gt an PN tubing is protected according to the requirements of the control joint nin LOY RRS ORONO Do not exceed Pass Under bend radius of tubing Control Joint Options Tube Spacing e Residential slabs will use 6 152 4 mm 9 228 6 mm or 12 304 8 mm tube spacing with some perimeter banding Banding is any area where the tubing is installed with a tighter on center spacing i 12 Usually seen along exterior walls with higher than normal heat loss 08 Spacing wider than 12 304 8 may produce unacceptable floor me tem
17. esponsible for damages resulting from improper installation and or maintenance Contact Watts at 855 699 2887 with any questions concerning the installation operation or maintenance of Watts Heating PEX or Heating PEX AL PEX A CAUTION 1 Do not install within 6 152 4 mm horizontally or 12 304 8 mm vertically to a heat source such as recessed light fixtures combustible flue vents general heating appliances Do not install directly to a heat source A metallic adapter minimum 18 457 2 mm in length must be used between the heat source and tubing Do not support fixtures directly from the tubing such as hose bibs or shut off valves 4 Protect the tubing via sleeves where it transitions through a concrete slab concrete wall or other framing material 5 Not to be used with Insulated Barrier Heating PEX products N Note Heating and Heating PEX AL PEX not approved or intended for use in potable water applications Note Local building or plumbing codes may require modifications to the information provided You are required to consult the local building and plumbing codes prior to installation If this information is not consistent with local building or plumbing codes the local codes should be followed General Handling amp Storage 1 If Heating PEX or Heating PEX AL PEX connections must be made in temperatures lower than 30 0 F 1
18. essure over a 24 hour period is not uncommon e Heated water should not be circulated through the finished pour for a minimum of 28 days or until the concrete slab is fully cured Heating PEX or Heating PEX AL PEX or Rebar Cable Tie Slab Loop Installation Detail Compression Ring Air Test Gauge Mounting Bracket Supply Manifold 0 0 D 5 Drain Ln f Barb Ee Ly Compression Nut Heating PEX or Heating PEX AL PEX Vent Purge 0 ld Return 7 ee Manifold 5 ht 2 O c al chrader OME KN O Valve 2 Balance Valve Drain Manifold Pressure Test Kit and Connection Detail Heating PEX or or Rebar Heating PEX AL PEX Slab on grade Cutaway Slab Layout Examples ZONE M 8 MANIFOLD 500 CIRCUIT LENGTHS Manifold 1 2 12 7 MM HEATING PEX L 12 101 6 304 8 Location ZONE M 3 MANIFOLD Manifold 300 CIRCUIT LENGTHS Location 1 2 12 7 MM HEATING PEX 12 304 8 Note Local building or plumbing codes may require modifications to the information provided You are required to consult the local building and plumbing codes prior to installation If this information is not consistent with local building or plumbing codes the local codes should
19. ffering so that it is possible to complete an installation with Watts products However it is possible that other manufacturers tubing and or fittings may be installed in any given installation Providing that the tubing and or fittings are manufactured to the applicable ASTM standards and have been certified by a recognized third party testing agency the Watts product in the given installation will continue to be covered under this warranty In the event of a system malfunction or leak that has other tubing and or fitting manufacturers components installed within the failed system Watts will be responsible only for Watts products Products manufactured by another company should be reported to that manufacturer for their warranty response WATTS DISCLAIMS ANY WARRANTY NOT PROVIDED HEREIN INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WATTS FURTHER DISCLAIMS ANY RESPONSIBILITY FOR SPECIAL INDIRECT SECONDARY INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING FROM OWNERSHIP OR USE OF THIS PRODUCT INCLUDING INCONVENIENCE OR LOSS OF USE OR THE COST OF REPLACING OR REPAIRING OTHER PROPERTY WHICH IS DAMAGED IF THIS PRODUCT DOES NOT WORK PROPERLY THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE FACE OF THIS DOCUMENT NO AGENT OR REPRESENTATIVE OF Watts HAS ANY AUTHORITY TO EXTEND OR MODIFY THIS WARRANTY UNLESS SUCH EXTENSION OR MODIFICATION IS MADE IN WRITING BY A CORPORATE OFFICER Some states do not allow the exclu
20. g on the tubing and cut at the correct length At expansion control joints the tubing may be passed under the area or must be sleeved with Armaflex or PVC to pass through expansion control joints see Expansion Joints for details Use 1 2 12 7 mm tubing for the radiant floor Use 3 4 19 1 mm or 1 25 4 mm Heating PEX or Heating PEX AL PEX for supply and return lines to the zone 16 8 Manifold Slab Manifold Location Supply Manifold Return Manifold i 6 Secure the Tubing e Secure all bends and corners to prevent Heating PEX from curling creating an unwanted high point in the circuit e Leave 5 1 52 m slack on each circuit to allow adjustment of the manifold position from its temporary location e Trim all tails of the cable ties to prevent any unwanted surface protrusions e Keep all circuits within 10 of the same length 8 Inspection e Visually inspect each circuit of tubing for possible damage caused during installation If damage is found repair it using an approved Watts repair kit Wrap the repair with electrical tape do not use duct tape to protect the connection from the concrete 9 Pressure Test Pressure test the system with 50 100 psi 3 4 6 9 bar water or air for 24 hours Do not use water if exterior temperatures are near or below freezing 32 0 F 0 0 C conditions e Attach the pressure test kit to the manifold pair making ce
21. onal ASTM F876 and F877 SDR9 dimensions These standards include requirements and testing methods for materials workmanship dimensions environmental stress cracking sustained hydro static pressure strength bend strength and degree of cross linking Heating PEX meets or exceeds these standards Heating PEX is tested and listed by the NSF International to NSF 14 rfh Heating PEX is tested and listed by Intertek to ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials and meet the requirements of NFPA 90A Heating PEX is tested and listed to UL 263 Fire Tests of Building Construction and Materials by Intertek Heating PEX is listed by the International Code Council Evaluation Service ICC to Report ESR 1155 and PMG 1008 which give compliance to IPC IMC and UPC UMC Heating PEX is certified to CSA Standard B137 5 Expansion Rate 1 1 100 10 F Allow 1 8 slack for every foot of installed tubing Temperature Pressure 73 4 F 23 C 160 psi 1 10 MPa Min Support Min Support Minimum Fluid Capacity Vertical Horizontal Description ID OD Bend Radius gal 100 Distance Distance 0 485 5 8 iii hi Ss SD Ee Des 0 875 1 18 6 The bend radius for Heating PEX may require some bends to be light bulb in shape This method allows for tighter on center spacing without compromising the tubing Heating PEX AL
22. ordance to structural requirements To help keep the holes in line it may be helpful to first mark the joists with a chalk line 1 3 4 e If the supply and return sections of the circuit are to be installed 44 4 mm through a common joist transition point a 1 3 4 44 4 mm hole is required option 1 If the supply and return sections are to be run in dedicated transition points 1 25 4 mm holes can be used option 2 e f using TJI joists it may be possible to use the pre fabricated knock outs instead of having to drill transition points Make sure the knock outs are large enough for the tubing before proceeding Option 2 Under Floor Joist Penetration Detail Stay a min of 8 50 8 mm minimum Penetrations can not be closer 203 2 mm from between penetrations than 2 50 8 mm to the top end of joist oy or bottom of the joist penetration zone max bore size 1 3 joist height center line joist height When crossing a joist at a perpendicular angle it is recommended to follow BOCA 2305 3 2 guidelines for allowable joist penetrations BOCA Joist Penetration Guideline Frame Floor Section Manifold Installation Under Floor Manifold Installation Detail 15 5 Install Tubing Pull one end of the tubing from the unwinder and feed through the first joist e Create a large loop with the tu
23. ould never Base Rock e Be placed directly on top of clay or organic subsoil or Rebar e Be placed directly on top of solid bedrock Slab On Grade Cross Section Insulation Requirements Two main areas to insulate Slab Minimum 2 50 8 mm e Vertically around the perimeter of the slab required covering above tubing Horizontally underneath the slab site Both aid in the slab s response and efficiency Of the two vertical edge insulation is the most important for preventing heat loss directly to the outside environment Horizontal insulation helps decrease the slab s required start up time by isolating the slab from the ground below Type of Insulation Recommended insulation e Extruded polystyrene insulation board or equivalent Not recommended WN Minimum 1 25 4 Beaded insulation boards COG Extruded Polystyrene Insulation Foil faced batt or board insulation 755 254 Bubble type insulation at o a 3 1 1 25 4 mm insulation board R 5 or better is recommended Thicker board may be used in cold aggressive climates Always check Slab Insulation Detail with an architect or structural engineer to ensure the appropriate insulation is used Watts does not recommend bubble type insulation under a slab Protective Joint application Most insulations of this type do not offer proper structural support Consult a stru
24. perature variations striping Tube spacing wider than 12 on 6 center is not recommended eee Fasteners Tubing can be attached to either the rewire rebar or below slab insulation The following can be used depending on installation requirements Toe Tube Spacing e Nylon CableTies used to secure tubing to either rewire or rebar 12 18 304 8 mm 425 2 mm on center e Foam Board Staples can be used to secure tubing directly to the horizontal board insulation below the slab Slab Profile and General Details In Slab on Grade applications a minimum of 2 3 50 8 mm 76 2 mm of concrete covering must be maintained above the tubing More coverage may be necessary depending on the structural requirements of the slab Installation Steps Manifold locations final concrete thickness and zoning details can affect how a concrete application is installed The following guidelines cover the most common installation conditions If a given situation is not covered here or if unexpected circumstances arise please contact Watts or a heating professional Insulation Layer and or Vapor Barrier 1 Pre Pour Conditions e Verify all subgrade conditions are properly prepared e Rewire or rebar are in place Slab Subgrade Detail and installed according to design conditions e With orange spray paint locate all interior walls and o
25. ression Ring Compression Nut Heating PEX or Heating PEX AL PEX H RO Schrader 0 Valve Balance Valve Manifold Pressure Test Kit and Connection Detail i Drain 16 Insulation Requirements e is important to have a tight seal between the horizontal insulation and the joist itself The tighter the joist cavity the better the system will perform e Foil insulation will ensure most of the heat and energy coming from the tubing is reflected upward towards the subfloor where it is evenly distributed e A 2 4 50 8 101 6 mm air gap is necessary between the tubing and insulation This air gap helps increase the effective R value of the in sulation while optimizing the ability of the foil to reflect energy e An R value of at least 4 times higher than the floor is desire For most interior conditions an R 13 or a 3 1 2 88 9 mm batt should be used When installing over an unheated area exposed area or crawlspace a minimum R 19 or 6 152 4 mm batt should be used Under Floor Layout Example Heating PEX or Hgating Rees Heat Transfer Plate 222222222222222222522222222222222222222222222222222222222222222222 lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt BESS SSS SSS SS SSS SSSSSSSS SELES SES SSS SSS SESS SSS SOY 2 50 8 mm Foil Faced Insulation 17 18 HEATING PEX and Heating PEX AL PEX HEATING COOLING and SNOW MELTING LIMI
26. rtain the rubber o rings are properly seated before threading the unions together e Using the Schraeder valve for air or the water fill valves for liquid fill the system air or water but not both e Close the valve and fill Pressure test the system with 50 100 psi 3 4 6 9 bar water or air for 24 hours Note If the exterior temperatures are near or below freezing 32 0 F 0 0 C use air to pressure test If a fluid must be used use a 50 50 water glycol solution Failure to use glycol may result in frozen circuits The cool night air will usually cause less than a 10 psi drop in pressure as the water or air contracts from the cold Do not test over 100 psi 6 9 bar as this will damage the gauge on the test kit Some minor pressure changes will occur due to the increased internal temperatures of the concrete as it begins the curing process Fluctuations in air temperature may also cause a slight change in the test pressure In most cases a 10 15 psi 0 7 1 0 bar drop in pressure over a twenty four hour period is not uncommon 10 The Concrete Pour To help detect possible damage caused during the concrete pour keep the system under pressure If damage is apparent locate the area in question and repair e Minor pressure changes will occur during the concrete curing process e Fluctuations in air temperature may cause slight changes in the test pressure In most cases a 10 15 psi 0 7 1 0 bar drop in pr
27. sion or limitation of incidental or consequential damages and some states do not allow limitations on how long implied warranties may last Therefore the above limitations or exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state Effective July 1 2011 This warranty applies to all products purchased after this date WIWATTS Watts Regulator Company 815 Chestnut St No Andover MA 01845 855 699 2887 USA and Canada 978 794 1848 Fax _ radiant watts com Materials and Tools Checklist Measuring Tape Chalk Line Electrical Tape Marker Electric Drill 1 3 4 44 5 mm Hole Saw Safety Glasses Tubing Unwinder Tubing Cutter Bend Supports for Heating PEX installation only Manifold Box optional Heating PEX or Heating PEX AL PEX tubing Watts Copper Compression Manifold Kit with correct number of circuit connections for tubing type installed Heating PEX AL PEX Reamer if installing Heating PEX AL PEX tubing Railways for slab on grade installations Foam Board Stapler for insulated slab on grade installations only Foam Board Staples for insulated slab on grade installations only Foam Board Screw Clip Tool for insulated slab on grade installations only Foam Board Screw Clips for insulated slab on grade installations only Cable Ties for slab on grade installations
28. ther obstacles to be avoided such as toilet areas sewer drains and any structural supports that may penetrate the slab 2 Install Manifolds Temporary Locate where the manifolds are to be installed Rebar Supports e Drive two pieces of rebar vertically into the ground They may be removed after the slab is poured and made ready for framing e Secure the manifolds with the use of cable ties or electrical tape e Keep manifolds high enough to allow for the thickness of the concrete the interior wall base plate and other structural items which may be installed after the pour Compacted Subgrade Manifold Pair Slab Manifold Installation Detail 3 Determine Zone Boundaries Before tubing is installed visually inspect the area to determine the zone boundaries This helps determine where the first circuit is to be placed while identifying any obstacles 4 Confirm Tubing Requirements Measure the distance from the manifolds to the farthest point in the zone via right angles Make sure the minimum circuit length is at least twice this distance If not the tubing will not be long enough to reach the farthest point of the zone and return 5 Install Tubing Pull one end of tubing off the unwinder and attach it to the first barb of one of the manifolds Install using a single serpentine pattern keeping the tubing 6 8 152 4 mm 203 2 mm from the edge of the slab Pay attention to the footage markin
29. ure the distance from the manifold to the farthest point moving in right angles to ensure proper circuit length is being used This distance should be less than the circuit length for the zone Installation Steps 1 Install manifolds Locate where the manifolds are to be placed e With the use of Watts manifold brackets or manifold mounting enclosure secure the manifolds to the wall 2 Determine Zone Boundaries e Before tubing is installed visually inspect the area to determine the zone boundaries This helps determine where the first circuit is to be placed while identifying any obstacles 3 Confirm Tubing Requirements e Measure the distance from the manifolds to the farthest point in the zone Make sure the minimum circuit length is at least twice this dis tance If not the tubing will not be long enough to reach the farthest point of the zone and return see slab section for illustration 14 Heating PEX or Heating PEX AL PEX Foil Faced Insulation Under Floor Application Cross Section Heating PEX or 5 Heating Heat Transfer Plate PEX AL PEX aa 2222222222222222222 22022222222222222222222222 A 222222222222222222 CAS MMS MSS SASS SASS ae 55555 2 50 8 mm air Foil Faced Insulation Under Floor Tube Spacing eS SS Sea See Supply Manifold Retur Manifold Confirm Tubing Requirements 4 Drill joists if necessary e Drill in acc
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